/* roulang page: index */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 80px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        a:hover {
            color: #7DD3FC;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 18px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
        }

        /* ========== Header / Navigation ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }

        .nav-links li {
            position: relative;
        }

        .nav-links a {
            display: block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-action-link {
            padding: 7px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.10);
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .nav-action-link:hover {
            color: var(--text-primary);
            border-color: rgba(56, 189, 248, 0.30);
            background: rgba(56, 189, 248, 0.06);
        }

        .nav-action-link.accent {
            color: var(--accent);
            border-color: rgba(56, 189, 248, 0.35);
        }

        .nav-action-link.accent:hover {
            background: rgba(56, 189, 248, 0.12);
            border-color: var(--accent);
        }

        .menu-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.10);
            background: rgba(255, 255, 255, 0.04);
        }

        .menu-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-base);
        }

        .menu-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(8, 13, 23, 0.98);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 998;
            padding: 24px;
            flex-direction: column;
            gap: 8px;
            overflow-y: auto;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            display: block;
            padding: 14px 18px;
            font-size: 17px;
            font-weight: 500;
            color: var(--text-primary);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.06);
            background: rgba(255, 255, 255, 0.03);
            transition: all var(--transition-base);
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(56, 189, 248, 0.12);
            border-color: rgba(56, 189, 248, 0.30);
            color: var(--accent);
        }

        @media (max-width: 1024px) {
            .nav-links {
                display: none;
            }
            .nav-actions {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
        }

        /* ========== Hero Section ========== */
        .hero-section {
            position: relative;
            padding: 64px 0 48px;
            background:
                radial-gradient(ellipse at 30% 20%, rgba(56, 189, 248, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 75% 55%, rgba(248, 113, 113, 0.04) 0%, transparent 45%),
                linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 100%);
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 65%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -180px;
            left: -120px;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.06) 0%, transparent 60%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border: 1px solid rgba(56, 189, 248, 0.25);
            border-radius: var(--radius-full);
            letter-spacing: 0.5px;
            align-self: flex-start;
        }

        .hero-badge::before {
            content: '';
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.5);
            }
            50% {
                opacity: 0.7;
                box-shadow: 0 0 0 6px rgba(56, 189, 248, 0);
            }
        }

        .hero-title {
            font-size: clamp(28px, 4.5vw, 44px);
            font-weight: 700;
            letter-spacing: 0.5px;
            line-height: 1.25;
            color: var(--text-primary);
            background: linear-gradient(135deg, #E6F1FF 0%, #B8D4F0 55%, #7DD3FC 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text-secondary);
            max-width: 620px;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 26px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            letter-spacing: 0.3px;
            min-height: 48px;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            color: #0B1220;
            box-shadow: var(--shadow-btn);
        }

        .btn-primary:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
            color: #0B1220;
        }

        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: var(--shadow-btn);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-primary);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(56, 189, 248, 0.35);
            color: var(--text-primary);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 32px;
            padding-top: 8px;
            border-top: 1px solid rgba(255, 255, 255, 0.07);
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .trust-item .trust-icon {
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(56, 189, 248, 0.12);
            color: var(--accent);
            font-size: 13px;
            flex-shrink: 0;
        }

        .hero-visual {
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: center;
        }

        .progress-ring-wrap {
            position: relative;
            width: 180px;
            height: 180px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .progress-ring {
            transform: rotate(-90deg);
        }

        .progress-ring circle {
            fill: none;
            stroke-linecap: round;
            transition: stroke-dashoffset 1.2s ease;
        }

        .progress-ring .ring-bg {
            stroke: rgba(255, 255, 255, 0.08);
            stroke-width: 10;
        }

        .progress-ring .ring-fg {
            stroke: url(#ringGradient);
            stroke-width: 10;
            stroke-dasharray: 471.24;
            stroke-dashoffset: 37.7;
            filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.5));
        }

        .progress-center {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
        }

        .progress-number {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.2;
        }

        .progress-label {
            font-size: 12px;
            color: var(--text-secondary);
            letter-spacing: 0.5px;
        }

        .hero-tier-preview {
            display: flex;
            flex-direction: column;
            gap: 10px;
            width: 100%;
            max-width: 360px;
        }

        .tier-mini {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 18px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-base);
            cursor: pointer;
        }

        .tier-mini:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateX(4px);
        }

        .tier-mini .tier-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .tier-mini .tier-price {
            font-size: 14px;
            font-weight: 700;
            color: var(--accent);
        }

        .tier-mini .tier-tag {
            font-size: 12px;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            background: var(--secondary-soft);
            color: var(--secondary);
            font-weight: 500;
        }

        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-visual {
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: center;
            }
            .hero-tier-preview {
                max-width: 100%;
                flex-direction: row;
                flex-wrap: wrap;
            }
            .tier-mini {
                flex: 1;
                min-width: 200px;
            }
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 40px 0 32px;
            }
            .hero-title {
                font-size: 26px;
                line-height: 1.35;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-cta-group .btn {
                width: 100%;
            }
            .hero-visual {
                flex-direction: column;
            }
            .hero-tier-preview {
                flex-direction: column;
            }
            .tier-mini {
                min-width: 100%;
            }
            .progress-ring-wrap {
                width: 140px;
                height: 140px;
            }
            .progress-number {
                font-size: 26px;
            }
        }

        /* ========== Generic Section ========== */
        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: rgba(255, 255, 255, 0.02);
        }

        .section-header {
            text-align: left;
            margin-bottom: 40px;
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent);
            letter-spacing: 1px;
            margin-bottom: 10px;
            text-transform: uppercase;
        }

        .section-title {
            font-size: clamp(22px, 3vw, 30px);
            font-weight: 700;
            letter-spacing: 0.3px;
            color: var(--text-primary);
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 760px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 28px;
            }
        }

        /* ========== Key Data Bar ========== */
        .data-bar-section {
            padding: 0 0 20px;
        }

        .data-bar {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            overflow: hidden;
        }

        .data-bar-item {
            padding: 24px 18px;
            text-align: center;
            background: rgba(11, 18, 32, 0.85);
            transition: background var(--transition-base);
        }

        .data-bar-item:hover {
            background: rgba(255, 255, 255, 0.04);
        }

        .data-bar-number {
            font-size: 30px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.3;
            letter-spacing: -0.5px;
        }

        .data-bar-label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        @media (max-width: 1024px) {
            .data-bar {
                grid-template-columns: repeat(3, 1fr);
            }
            .data-bar-item:nth-child(4),
            .data-bar-item:nth-child(5) {
                grid-column: span 1;
            }
        }

        @media (max-width: 768px) {
            .data-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-bar-number {
                font-size: 24px;
            }
        }

        @media (max-width: 480px) {
            .data-bar {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Brand Intro ========== */
        .brand-intro-grid {
            display: grid;
            grid-template-columns: 1fr 1.3fr;
            gap: 48px;
            align-items: start;
        }

        .brand-intro-left .section-title {
            font-size: 28px;
        }

        .brand-intro-left .section-desc {
            margin-top: 16px;
        }

        .brand-intro-right {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .brand-intro-text {
            font-size: 16px;
            line-height: 2.0;
            color: var(--text-secondary);
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 28px 30px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        @media (max-width: 1024px) {
            .brand-intro-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .brand-intro-text {
                padding: 20px 18px;
                font-size: 15px;
            }
        }

        /* ========== Cards Grid ========== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }

        .glass-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 26px 24px;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            transition: all var(--transition-base);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .glass-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }

        .glass-card .card-icon {
            width: 46px;
            height: 46px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: rgba(56, 189, 248, 0.12);
            color: var(--accent);
            font-size: 20px;
            margin-bottom: 16px;
        }

        .glass-card .card-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 10px;
            line-height: 1.5;
        }

        .glass-card .card-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 14px;
        }

        .glass-card .card-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .glass-card .card-list li {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .glass-card .card-list li::before {
            content: '';
            width: 5px;
            height: 5px;
            background: var(--accent);
            border-radius: 50%;
            flex-shrink: 0;
        }

        @media (max-width: 1280px) {
            .cards-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .cards-grid .glass-card:nth-child(4) {
                grid-column: span 3;
            }
        }

        @media (max-width: 1024px) {
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cards-grid .glass-card:nth-child(4) {
                grid-column: span 2;
            }
        }

        @media (max-width: 768px) {
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .cards-grid .glass-card:nth-child(4) {
                grid-column: span 1;
            }
        }

        /* ========== Scenario Section ========== */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 22px;
        }

        .scenario-card {
            display: flex;
            gap: 20px;
            padding: 26px 24px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-base);
        }

        .scenario-card:hover {
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
            transform: translateY(-3px);
        }

        .scenario-num {
            font-size: 32px;
            font-weight: 700;
            color: rgba(56, 189, 248, 0.35);
            line-height: 1;
            flex-shrink: 0;
            min-width: 40px;
        }

        .scenario-info h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .scenario-info p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 10px;
        }

        .scenario-info .scenario-action {
            font-size: 14px;
            font-weight: 500;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .scenario-info .scenario-action::after {
            content: '→';
            transition: transform var(--transition-base);
        }

        .scenario-info .scenario-action:hover::after {
            transform: translateX(4px);
        }

        @media (max-width: 1024px) {
            .scenario-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Screenshot Demo ========== */
        .demo-wrap {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 36px;
            align-items: center;
        }

        .demo-visual {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-xl);
            padding: 20px;
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .demo-visual img {
            border-radius: var(--radius-md);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.30);
        }

        .demo-panels {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .demo-panel {
            padding: 18px 20px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .demo-panel:hover {
            border-color: var(--glass-border-strong);
        }

        .demo-panel h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .demo-panel p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 1024px) {
            .demo-wrap {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Pricing Table ========== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            align-items: stretch;
        }

        .price-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 30px 26px;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            display: flex;
            flex-direction: column;
            gap: 16px;
            transition: all var(--transition-base);
            position: relative;
        }

        .price-card:hover {
            border-color: var(--glass-border-strong);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }

        .price-card.featured {
            border-color: rgba(56, 189, 248, 0.40);
            background: rgba(56, 189, 248, 0.05);
            box-shadow: 0 0 28px rgba(56, 189, 248, 0.15);
        }

        .price-card .price-badge {
            position: absolute;
            top: -12px;
            right: 20px;
            padding: 4px 14px;
            font-size: 12px;
            font-weight: 600;
            color: #0B1220;
            background: var(--accent);
            border-radius: var(--radius-full);
            letter-spacing: 0.5px;
        }

        .price-name {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .price-amount {
            font-size: 36px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }

        .price-amount .price-unit {
            font-size: 15px;
            font-weight: 400;
            color: var(--text-muted);
        }

        .price-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex-grow: 1;
        }

        .price-features li {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .price-features li::before {
            content: '✓';
            color: var(--accent);
            font-weight: 700;
            flex-shrink: 0;
        }

        .price-card .btn {
            width: 100%;
        }

        @media (max-width: 1024px) {
            .pricing-grid {
                grid-template-columns: 1fr;
                max-width: 480px;
                margin: 0 auto;
            }
        }

        /* ========== Review Wall ========== */
        .review-wall {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }

        .review-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 22px 24px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-base);
        }

        .review-card:hover {
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
        }

        .review-card .reviewer {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
        }

        .review-card .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(56,189,248,0.3), rgba(34,211,238,0.2));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 15px;
            font-weight: 600;
            flex-shrink: 0;
        }

        .review-card .reviewer-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .review-card .reviewer-tag {
            font-size: 12px;
            color: var(--text-muted);
        }

        .review-card .review-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .review-stars {
            color: var(--accent);
            font-size: 13px;
            letter-spacing: 2px;
            margin-bottom: 6px;
        }

        @media (max-width: 768px) {
            .review-wall {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Community Buzz ========== */
        .buzz-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .buzz-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 20px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .buzz-item:hover {
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
        }

        .buzz-icon {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            background: rgba(56, 189, 248, 0.10);
            color: var(--accent);
            font-size: 17px;
            flex-shrink: 0;
        }

        .buzz-content {
            flex: 1;
        }

        .buzz-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 3px;
        }

        .buzz-meta {
            font-size: 12px;
            color: var(--text-muted);
        }

        .buzz-tag {
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 500;
            border-radius: var(--radius-full);
            background: rgba(56, 189, 248, 0.10);
            color: var(--accent);
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .buzz-item {
                flex-wrap: wrap;
            }
            .buzz-tag {
                margin-left: auto;
            }
        }

        /* ========== Schedule Table ========== */
        .schedule-wrap {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .schedule-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        .schedule-table th {
            text-align: left;
            padding: 14px 18px;
            font-weight: 600;
            font-size: 13px;
            color: var(--text-secondary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            background: rgba(255, 255, 255, 0.02);
            letter-spacing: 0.5px;
        }

        .schedule-table td {
            padding: 13px 18px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
        }

        .schedule-table tr:last-child td {
            border-bottom: none;
        }

        .schedule-table tr:hover td {
            background: rgba(56, 189, 248, 0.04);
        }

        .schedule-table .match-teams {
            font-weight: 600;
            color: var(--text-primary);
        }

        .schedule-table .match-tag {
            display: inline-block;
            padding: 2px 10px;
            font-size: 12px;
            font-weight: 500;
            border-radius: var(--radius-full);
            background: rgba(56, 189, 248, 0.10);
            color: var(--accent);
        }

        .schedule-table .match-time {
            color: var(--accent);
            font-weight: 500;
            white-space: nowrap;
        }

        @media (max-width: 768px) {
            .schedule-wrap {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
            .schedule-table {
                min-width: 560px;
                font-size: 13px;
            }
            .schedule-table th,
            .schedule-table td {
                padding: 10px 12px;
            }
        }

        /* ========== News List ========== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .news-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            transition: all var(--transition-base);
        }

        .news-card:hover {
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }

        .news-card .news-img {
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: 0;
        }

        .news-card .news-body {
            padding: 18px 20px 20px;
        }

        .news-card .news-cat {
            font-size: 12px;
            font-weight: 500;
            color: var(--accent);
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }

        .news-card .news-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.6;
            margin-bottom: 8px;
        }

        .news-card .news-meta {
            font-size: 12px;
            color: var(--text-muted);
        }

        @media (max-width: 1024px) {
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-card:nth-child(3) {
                grid-column: span 2;
            }
        }

        @media (max-width: 768px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
            .news-card:nth-child(3) {
                grid-column: span 1;
            }
        }

        /* ========== CTA / Subscribe ========== */
        .cta-section {
            background:
                radial-gradient(ellipse at 50% 0%, rgba(56, 189, 248, 0.10) 0%, transparent 55%),
                linear-gradient(180deg, var(--bg-medium) 0%, var(--bg-dark) 100%);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .cta-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .cta-content h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .cta-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.9;
        }

        .cta-form {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-group label {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
        }

        .form-group input {
            padding: 12px 16px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-md);
            color: var(--text-primary);
            font-size: 15px;
            transition: all var(--transition-base);
        }

        .form-group input::placeholder {
            color: var(--text-muted);
        }

        .form-group input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
            outline: none;
            background: rgba(255, 255, 255, 0.07);
        }

        .form-note {
            font-size: 12px;
            color: var(--text-muted);
            text-align: center;
        }

        @media (max-width: 1024px) {
            .cta-wrap {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Coverage Section ========== */
        .coverage-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .coverage-item {
            padding: 20px 18px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            text-align: center;
            transition: all var(--transition-base);
        }

        .coverage-item:hover {
            border-color: var(--glass-border-strong);
        }

        .coverage-item .cov-icon {
            font-size: 24px;
            color: var(--accent);
            margin-bottom: 8px;
        }

        .coverage-item h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .coverage-item p {
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .coverage-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .coverage-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== Security Section ========== */
        .security-list {
            display: flex;
            flex-wrap: wrap;
            gap: 14px 24px;
            list-style: none;
        }

        .security-list li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 10px 16px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
        }

        .security-list li:hover {
            border-color: var(--glass-border-strong);
        }

        .security-list li .sec-icon {
            color: var(--accent);
            font-size: 14px;
            flex-shrink: 0;
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 820px;
        }

        .faq-item {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--glass-border-strong);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            transition: all var(--transition-base);
            min-height: 48px;
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-question .faq-icon {
            font-size: 18px;
            color: var(--accent);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow) ease, padding var(--transition-base);
            padding: 0 22px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }

        .faq-answer p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 48px 0 28px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }

        .footer-brand .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            display: block;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-base);
        }

        .footer-col ul a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .footer-bottom .footer-links {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-top: 8px;
            flex-wrap: wrap;
        }

        .footer-bottom .footer-links a {
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-bottom .footer-links a:hover {
            color: var(--accent);
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom .footer-links {
                flex-direction: column;
                gap: 6px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 72px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }
        a:hover {
            color: #7DD3FC;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 576px) {
            .container {
                padding: 0 14px;
            }
        }
        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }
        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            text-decoration: none;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links li {
            position: relative;
        }
        .nav-links a {
            display: block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.12);
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-primary);
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }
        @media (max-width: 1024px) {
            .nav-toggle {
                display: flex;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(8, 13, 23, 0.98);
                padding: 16px 24px;
                gap: 4px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 14px 16px;
                font-size: 16px;
            }
        }
        /* Hero Compact */
        .category-hero {
            padding: 48px 0 36px;
            background: linear-gradient(135deg, rgba(11, 18, 32, 0.95) 0%, rgba(26, 42, 66, 0.85) 60%, rgba(11, 18, 32, 0.95) 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            min-height: 40vh;
            display: flex;
            align-items: center;
        }
        .category-hero .hero-title {
            font-size: 28px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .category-hero .hero-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 8px;
        }
        .category-hero .hero-image-wrap {
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--glass-border);
        }
        .category-hero .hero-image-wrap img {
            border-radius: var(--radius-xl);
            aspect-ratio: 16/10;
            object-fit: cover;
            width: 100%;
        }
        /* Data Strip */
        .data-strip {
            padding: 28px 0;
            background: rgba(255, 255, 255, 0.03);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .data-strip .data-item {
            text-align: center;
            padding: 10px 8px;
        }
        .data-strip .data-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }
        .data-strip .data-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .data-strip .data-number {
                font-size: 24px;
            }
        }
        /* Sub Nav Tags */
        .subnav-section {
            padding: 28px 0 8px;
        }
        .subnav-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .subnav-tags a {
            display: inline-block;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            text-decoration: none;
        }
        .subnav-tags a:hover {
            color: var(--text-primary);
            border-color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
        }
        /* Team List Cards */
        .team-list-section {
            padding: 32px 0 48px;
        }
        .section-heading {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .team-card {
            display: flex;
            gap: 16px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 18px;
            margin-bottom: 14px;
            transition: all var(--transition-base);
            align-items: center;
        }
        .team-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
            box-shadow: var(--shadow-float);
        }
        .team-card .team-thumb {
            width: 72px;
            height: 72px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
            border: 1px solid var(--glass-border);
        }
        .team-card .team-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-md);
        }
        .team-card .team-info {
            flex: 1;
            min-width: 0;
        }
        .team-card .team-name {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 3px;
        }
        .team-card .team-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .team-card .team-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 8px;
        }
        .team-card .badge-tag {
            display: inline-block;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 500;
            border-radius: var(--radius-full);
            background: rgba(56, 189, 248, 0.12);
            color: var(--accent);
            border: 1px solid rgba(56, 189, 248, 0.25);
        }
        @media (max-width: 576px) {
            .team-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .team-card .team-thumb {
                width: 100%;
                height: 160px;
            }
        }
        /* Featured */
        .featured-section {
            padding: 48px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .featured-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 20px;
            height: 100%;
            transition: all var(--transition-base);
        }
        .featured-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-4px);
            box-shadow: var(--shadow-float);
        }
        .featured-card .featured-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 14px;
            aspect-ratio: 16/9;
        }
        .featured-card .featured-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-md);
        }
        .featured-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .featured-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }
        /* Topics */
        .topics-section {
            padding: 48px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .topic-row {
            display: flex;
            gap: 16px;
            align-items: center;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 16px 20px;
            margin-bottom: 12px;
            transition: all var(--transition-base);
            text-decoration: none;
        }
        .topic-row:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateX(4px);
        }
        .topic-row .topic-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .topic-row .topic-desc {
            font-size: 14px;
            color: var(--text-secondary);
            flex: 1;
        }
        /* Subscribe */
        .subscribe-section {
            padding: 56px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .subscribe-panel {
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(26, 42, 66, 0.6) 60%, rgba(11, 18, 32, 0.9) 100%);
            border: 1px solid var(--glass-border-strong);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
            text-align: center;
        }
        .subscribe-panel h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }
        .subscribe-panel p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 20px;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .subscribe-form input {
            flex: 1;
            min-width: 200px;
            padding: 12px 16px;
            font-size: 14px;
            border-radius: var(--radius-md);
            border: 1px solid var(--glass-border);
            background: rgba(11, 18, 32, 0.7);
            color: var(--text-primary);
            transition: all var(--transition-base);
        }
        .subscribe-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
            outline: none;
        }
        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }
        .btn-primary {
            padding: 12px 24px;
            font-size: 15px;
            font-weight: 600;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-md);
            border: none;
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-2px);
            color: #0B1220;
            background: linear-gradient(135deg, #7DD3FC 0%, var(--accent-alt) 100%);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        /* FAQ */
        .faq-section {
            padding: 48px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .faq-item {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item.active {
            border-color: var(--glass-border-strong);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            border: none;
            cursor: pointer;
            transition: all var(--transition-base);
            text-align: left;
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.04);
        }
        .faq-question::after {
            content: '+';
            font-size: 20px;
            font-weight: 400;
            color: var(--accent);
            transition: transform var(--transition-base);
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 20px 16px;
        }
        /* Source Note */
        .source-section {
            padding: 36px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .source-note {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            background: rgba(255, 255, 255, 0.03);
            border-left: 3px solid var(--accent);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        }
        /* Footer */
        .site-footer {
            background: var(--primary-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-base);
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
        }
        .footer-links {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: 13px;
            text-decoration: none;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 576px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .category-hero .hero-title {
                font-size: 24px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 72px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        a:hover {
            color: #7DD3FC;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Header / Navigation ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links li {
            position: relative;
        }

        .nav-links a {
            display: block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1.5;
        }

        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.12);
            border: 1px solid rgba(56, 189, 248, 0.25);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 600;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-full);
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1.5;
        }

        .nav-cta-btn:hover {
            color: #0B1220;
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }

        .hamburger {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-base);
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-base);
        }

        /* ========== Breadcrumb ========== */
        .breadcrumb {
            padding: 16px 0 0;
            font-size: 14px;
            color: var(--text-muted);
        }

        .breadcrumb a {
            color: var(--text-secondary);
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb .sep {
            margin: 0 8px;
            color: var(--text-muted);
        }

        .breadcrumb .current {
            color: var(--text-primary);
        }

        /* ========== Hero Compact ========== */
        .category-hero {
            position: relative;
            padding: 40px 0 36px;
            overflow: hidden;
            background: linear-gradient(135deg, rgba(11, 18, 32, 0.95) 0%, rgba(26, 42, 66, 0.85) 55%, rgba(11, 18, 32, 0.95) 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            min-height: 220px;
            display: flex;
            align-items: center;
        }

        .category-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/f3355ebdbc0b20ce.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
            z-index: 0;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 18, 32, 0.55) 0%, rgba(11, 18, 32, 0.75) 100%);
            pointer-events: none;
            z-index: 1;
        }

        .category-hero .container {
            position: relative;
            z-index: 2;
        }

        .category-hero-content {
            max-width: 800px;
        }

        .category-hero h1 {
            font-size: 32px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.35;
        }

        .category-hero .hero-sub {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 18px;
            max-width: 680px;
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 20px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .hero-meta .dot {
            width: 4px;
            height: 4px;
            background: var(--accent);
            border-radius: 50%;
            display: inline-block;
        }

        /* ========== Section Styles ========== */
        main {
            display: block;
        }

        section {
            padding: var(--section-padding);
        }

        .section-alternate {
            background: rgba(255, 255, 255, 0.02);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .section-header {
            margin-bottom: 32px;
        }

        .section-header h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.3px;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .section-header p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 700px;
        }

        .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.12);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            margin-bottom: 10px;
            letter-spacing: 0.5px;
            border: 1px solid rgba(56, 189, 248, 0.20);
        }

        /* ========== Data List Cards ========== */
        .data-list-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }

        .data-card {
            background: var(--glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 20px 22px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
        }

        .data-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }

        .data-card-img {
            width: 72px;
            height: 72px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
            background: rgba(255, 255, 255, 0.06);
        }

        .data-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-md);
        }

        .data-card-body {
            flex: 1;
            min-width: 0;
        }

        .data-card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            line-height: 1.5;
        }

        .data-card-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 8px;
        }

        .data-card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            font-size: 12px;
            color: var(--text-muted);
        }

        .data-card-meta .tag {
            display: inline-block;
            padding: 2px 8px;
            background: rgba(56, 189, 248, 0.10);
            border-radius: var(--radius-sm);
            color: var(--accent);
            font-size: 12px;
            font-weight: 500;
            border: 1px solid rgba(56, 189, 248, 0.15);
        }

        .data-card-meta .time {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* ========== Sub-topic Nav ========== */
        .subtopic-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 8px;
        }

        .subtopic-nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            line-height: 1.5;
        }

        .subtopic-nav a:hover {
            color: var(--text-primary);
            background: rgba(56, 189, 248, 0.10);
            border-color: rgba(56, 189, 248, 0.25);
        }

        /* ========== Featured Cards ========== */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .featured-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
        }

        .featured-card:hover {
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }

        .featured-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }

        .featured-card-content {
            padding: 16px 18px;
        }

        .featured-card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.5;
        }

        .featured-card-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 10px;
        }

        .featured-card-tag {
            font-size: 12px;
            color: var(--accent);
            font-weight: 500;
        }

        /* ========== Stats Summary ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .stat-cell {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            padding: 22px 20px;
            text-align: center;
            transition: all var(--transition-base);
        }

        .stat-cell:hover {
            border-color: rgba(56, 189, 248, 0.25);
            background: rgba(255, 255, 255, 0.06);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            letter-spacing: 0.5px;
        }

        .stat-unit {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 6px;
        }

        /* ========== Related Topics ========== */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .related-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            padding: 20px 22px;
            display: flex;
            gap: 14px;
            align-items: flex-start;
            transition: all var(--transition-base);
        }

        .related-card:hover {
            border-color: rgba(56, 189, 248, 0.25);
            background: rgba(255, 255, 255, 0.06);
        }

        .related-icon {
            width: 44px;
            height: 44px;
            background: rgba(56, 189, 248, 0.12);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 20px;
            color: var(--accent);
        }

        .related-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            line-height: 1.5;
        }

        .related-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== Subscribe / Alert ========== */
        .subscribe-section {
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.08) 0%, rgba(34, 211, 238, 0.06) 50%, rgba(11, 18, 32, 0.5) 100%);
            border: 1px solid rgba(56, 189, 248, 0.20);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
            box-shadow: var(--shadow-card);
        }

        .subscribe-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            align-items: center;
        }

        .subscribe-text h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .subscribe-text p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .subscribe-form {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .subscribe-form input {
            flex: 1;
            min-width: 180px;
            padding: 12px 16px;
            font-size: 14px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            outline: none;
        }

        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }

        .subscribe-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
        }

        .subscribe-form button {
            padding: 12px 24px;
            font-size: 14px;
            font-weight: 600;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1.5;
        }

        .subscribe-form button:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }

        .subscribe-form button:active {
            transform: scale(0.98);
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
        }

        .faq-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-lg);
            padding: 18px 20px;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: rgba(56, 189, 248, 0.20);
            background: rgba(255, 255, 255, 0.06);
        }

        .faq-question {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.5;
        }

        .faq-answer {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== Source Note ========== */
        .source-note {
            background: rgba(255, 255, 255, 0.03);
            border: 1px dashed rgba(255, 255, 255, 0.10);
            border-radius: var(--radius-lg);
            padding: 18px 22px;
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .source-note strong {
            color: var(--text-secondary);
            font-weight: 600;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: #080D17;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }

        .footer-brand .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-top: 10px;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col li {
            margin-bottom: 8px;
        }

        .footer-col a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-base);
            line-height: 1.5;
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 18px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px 20px;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-links {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-links a {
            color: var(--text-secondary);
            font-size: 13px;
        }

        .footer-links a:hover {
            color: var(--accent);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .nav-cta {
                display: none;
            }

            .data-list-grid {
                grid-template-columns: 1fr;
            }

            .featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 48px 0;
                --header-height: 56px;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(11, 18, 32, 0.98);
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                padding: 16px 20px;
                gap: 4px;
                z-index: 999;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links a {
                padding: 12px 16px;
                font-size: 15px;
                width: 100%;
            }

            .hamburger {
                display: flex;
            }

            .category-hero {
                padding: 28px 0 24px;
                min-height: 180px;
            }

            .category-hero h1 {
                font-size: 24px;
            }

            .category-hero .hero-sub {
                font-size: 14px;
            }

            .data-card {
                padding: 16px;
                flex-direction: column;
                gap: 12px;
            }

            .data-card-img {
                width: 100%;
                height: 160px;
            }

            .featured-grid {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .stat-number {
                font-size: 28px;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .subscribe-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .subscribe-form input {
                min-width: 100%;
            }

            .subscribe-form button {
                width: 100%;
            }

            .faq-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .container {
                padding: 0 14px;
            }
        }

        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }

            .category-hero h1 {
                font-size: 22px;
                line-height: 1.4;
            }

            .category-hero .hero-sub {
                font-size: 13px;
                line-height: 1.7;
            }

            .hero-meta {
                font-size: 12px;
                gap: 6px 12px;
            }

            .data-card-title {
                font-size: 15px;
            }

            .section-header h2 {
                font-size: 20px;
            }

            .btn-primary,
            .subscribe-form button {
                width: 100%;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 80px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }
        a:hover {
            color: #7DD3FC;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 1024px) {
            .container {
                padding: 0 18px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
        }
        /* ========== Header / Navigation ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }
        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }
        .nav-links li {
            position: relative;
        }
        .nav-links a {
            display: block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.20);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .nav-action-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 8px 14px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .nav-action-link:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: var(--glass-border-strong);
            color: var(--accent);
        }
        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            font-size: 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--glass-border);
            background: rgba(255, 255, 255, 0.05);
            transition: all var(--transition-base);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: var(--glass-border-strong);
        }
        @media (max-width: 1024px) {
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                gap: 0;
                background: rgba(11, 18, 32, 0.98);
                padding: 12px 24px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                backdrop-filter: blur(18px);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links li {
                width: 100%;
            }
            .nav-links a {
                padding: 14px 10px;
                font-size: 16px;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-actions {
                display: none;
            }
        }
        @media (max-width: 480px) {
            .logo-text {
                font-size: 18px;
            }
            .nav-inner {
                gap: 10px;
            }
        }
        /* ========== Breadcrumb ========== */
        .breadcrumb {
            padding: 24px 0 0;
            font-size: 13px;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            margin: 0 8px;
            color: var(--text-muted);
        }
        .breadcrumb .current {
            color: var(--accent);
        }
        /* ========== Page Hero (Compact) ========== */
        .page-hero {
            padding: 48px 0 36px;
            position: relative;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 200px;
            background: radial-gradient(ellipse at center, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .page-hero-inner {
            display: flex;
            align-items: flex-start;
            gap: 32px;
            position: relative;
            z-index: 1;
        }
        .page-hero-content {
            flex: 1;
        }
        .page-hero-image {
            flex-shrink: 0;
            width: 280px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--glass-border);
        }
        .page-hero h1 {
            font-size: 34px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            line-height: 1.35;
            margin-bottom: 14px;
        }
        .page-hero .subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 640px;
        }
        .page-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            font-size: 12px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border: 1px solid rgba(56, 189, 248, 0.25);
            border-radius: var(--radius-full);
            margin-bottom: 14px;
        }
        @media (max-width: 768px) {
            .page-hero {
                padding: 32px 0 24px;
            }
            .page-hero-inner {
                flex-direction: column;
                gap: 20px;
            }
            .page-hero-image {
                width: 100%;
                max-height: 240px;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .page-hero .subtitle {
                font-size: 16px;
            }
        }
        @media (max-width: 480px) {
            .page-hero {
                padding: 24px 0 20px;
            }
            .page-hero h1 {
                font-size: 22px;
            }
        }
        /* ========== Section Common ========== */
        .section {
            padding: var(--section-padding);
        }
        @media (max-width: 768px) {
            .section {
                padding: 40px 0;
            }
        }
        @media (max-width: 480px) {
            .section {
                padding: 32px 0;
            }
        }
        .section-title {
            font-size: 26px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 720px;
        }
        @media (max-width: 480px) {
            .section-title {
                font-size: 22px;
            }
            .section-desc {
                font-size: 15px;
            }
        }
        /* ========== Stats Summary ========== */
        .stats-summary {
            padding: 0;
            margin-bottom: 48px;
        }
        .stats-summary-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .stats-summary-item {
            background: var(--glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            transition: all var(--transition-base);
        }
        .stats-summary-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-3px);
            box-shadow: var(--shadow-float);
        }
        .stats-summary-item .num {
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 0.5px;
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stats-summary-item .label {
            font-size: 14px;
            color: var(--text-secondary);
        }
        @media (max-width: 1024px) {
            .stats-summary-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .stats-summary-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .stats-summary-item {
                padding: 20px 16px;
            }
            .stats-summary-item .num {
                font-size: 28px;
            }
        }
        /* ========== Sub-topic nav ========== */
        .subtopic-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 40px;
        }
        .subtopic-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
        }
        .subtopic-nav a:hover {
            color: var(--accent);
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
        }
        /* ========== Article List ========== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .article-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }
        .article-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-2px);
            box-shadow: var(--shadow-float);
        }
        .article-item .item-content {
            flex: 1;
            min-width: 0;
        }
        .article-item .item-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 4px;
        }
        .article-item .item-summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-item .item-meta {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 6px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        .article-item .item-meta .tag {
            display: inline-flex;
            padding: 3px 10px;
            font-size: 11px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border-radius: var(--radius-full);
        }
        .article-item .item-thumb {
            flex-shrink: 0;
            width: 72px;
            height: 72px;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--glass-border);
        }
        .article-item .item-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-md);
        }
        @media (max-width: 480px) {
            .article-item {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px;
            }
            .article-item .item-thumb {
                width: 100%;
                height: 160px;
            }
        }
        /* ========== Featured Cards ========== */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .featured-card {
            background: var(--glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-xl);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .featured-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .featured-card .card-image {
            width: 100%;
            height: 160px;
            overflow: hidden;
        }
        .featured-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }
        .featured-card .card-body {
            padding: 20px 22px;
        }
        .featured-card .card-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 500;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: var(--secondary-soft);
            color: var(--secondary);
            margin-bottom: 10px;
        }
        .featured-card .card-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 8px;
        }
        .featured-card .card-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        @media (max-width: 1024px) {
            .featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .featured-grid {
                grid-template-columns: 1fr;
            }
        }
        /* ========== Deep Topic ========== */
        .deep-topic-grid {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .deep-topic-item {
            display: flex;
            gap: 16px;
            align-items: center;
            padding: 16px 20px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }
        .deep-topic-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
        }
        .deep-topic-item .dot {
            flex-shrink: 0;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--accent);
            box-shadow: 0 0 10px var(--accent-glow);
        }
        .deep-topic-item .topic-info {
            flex: 1;
            min-width: 0;
        }
        .deep-topic-item .topic-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .deep-topic-item .topic-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        /* ========== Subscribe ========== */
        .subscribe-section {
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.08) 0%, rgba(34, 211, 238, 0.04) 50%, rgba(11, 18, 32, 0.9) 100%);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-xl);
            padding: 40px 36px;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
        }
        .subscribe-inner {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .subscribe-text {
            flex: 1;
        }
        .subscribe-text h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 8px;
        }
        .subscribe-text p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .subscribe-form {
            flex-shrink: 0;
            display: flex;
            gap: 10px;
            width: 100%;
            max-width: 380px;
        }
        .subscribe-form input {
            flex: 1;
            padding: 12px 16px;
            font-size: 14px;
            color: var(--text-primary);
            background: rgba(11, 18, 32, 0.7);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            outline: none;
        }
        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }
        .subscribe-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 12px rgba(56, 189, 248, 0.30);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 22px;
            font-size: 14px;
            font-weight: 600;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-btn);
            white-space: nowrap;
            border: none;
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-btn-hover);
            background: linear-gradient(135deg, #60C9F9 0%, #3DE0F2 100%);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        @media (max-width: 768px) {
            .subscribe-section {
                padding: 28px 20px;
            }
            .subscribe-inner {
                flex-direction: column;
                gap: 20px;
            }
            .subscribe-form {
                flex-direction: column;
                max-width: 100%;
            }
            .subscribe-form input {
                width: 100%;
            }
        }
        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item:hover {
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            transition: all var(--transition-base);
            cursor: pointer;
            border: none;
            background: none;
            min-height: 44px;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            color: var(--accent);
            font-size: 18px;
            transition: transform var(--transition-base);
            border: 1px solid var(--glass-border);
            margin-left: 12px;
        }
        .faq-question:hover .faq-icon {
            border-color: var(--glass-border-strong);
            background: rgba(56, 189, 248, 0.10);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
        }
        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .faq-item.active .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
        }
        .faq-item.active {
            border-color: var(--glass-border-strong);
        }
        /* ========== Source Note ========== */
        .source-note {
            padding: 24px 0 8px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
        }
        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 48px 0 24px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 18px;
            margin-bottom: 10px;
            display: inline-block;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color var(--transition-base);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a {
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer {
                padding: 32px 0 16px;
            }
        }
        /* ========== Utility ========== */
        .text-accent {
            color: var(--accent);
        }
        .text-secondary {
            color: var(--text-secondary);
        }
        .mt-0 {
            margin-top: 0;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: category3 */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 80px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
            padding: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }
        a:hover {
            color: #7DD3FC;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Header / Navigation ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }
        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links li {
            position: relative;
        }
        .nav-links a {
            display: block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .nav-cta a {
            display: inline-block;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
            border: 1px solid rgba(255, 255, 255, 0.10);
        }
        .nav-cta a:hover {
            color: var(--text-primary);
            border-color: var(--accent);
            background: rgba(56, 189, 248, 0.08);
        }
        .nav-cta a.nav-primary {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            color: #0B1220;
            font-weight: 600;
            border: none;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }
        .nav-cta a.nav-primary:hover {
            box-shadow: 0 0 28px rgba(56, 189, 248, 0.55);
            color: #0B1220;
        }
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-base);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }
        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-base);
        }
        .mobile-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== Main / Sections ========== */
        main {
            display: block;
        }
        .section {
            padding: var(--section-padding);
        }
        .section-alt {
            background: rgba(255, 255, 255, 0.02);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 12px 0;
            letter-spacing: 0.5px;
            line-height: 1.4;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-secondary);
            margin: 0;
            max-width: 680px;
            line-height: 1.9;
        }
        .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border: 1px solid rgba(56, 189, 248, 0.20);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        /* ========== Category Hero (compact, not full-screen) ========== */
        .category-hero {
            padding: 48px 0 56px;
            background: linear-gradient(180deg, rgba(11, 18, 32, 0.9) 0%, rgba(15, 27, 48, 0.7) 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            position: relative;
            overflow: hidden;
        }
        .category-hero::before {
            content: "";
            position: absolute;
            top: -120px;
            right: -80px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .category-hero::after {
            content: "";
            position: absolute;
            bottom: -140px;
            left: -60px;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(248, 113, 113, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .category-hero-wrapper {
            position: relative;
            z-index: 1;
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            align-items: center;
            justify-content: space-between;
        }
        .category-hero-text {
            flex: 1 1 55%;
            min-width: 280px;
        }
        .category-hero-text .section-tag {
            margin-bottom: 14px;
        }
        .category-hero h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 14px 0;
            line-height: 1.35;
            letter-spacing: 0.5px;
        }
        .category-hero p {
            font-size: 16px;
            color: var(--text-secondary);
            margin: 0;
            max-width: 560px;
            line-height: 1.95;
        }
        .category-hero-image {
            flex: 1 1 35%;
            min-width: 240px;
            max-width: 440px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(56, 189, 248, 0.18);
            position: relative;
        }
        .category-hero-image img {
            width: 100%;
            height: 260px;
            object-fit: cover;
            border-radius: 0;
        }
        .category-hero-image::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(11, 18, 32, 0.55) 100%);
            border-radius: var(--radius-lg);
            pointer-events: none;
        }

        /* ========== Article List Cards ========== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            border-color: var(--glass-border-strong);
            box-shadow: var(--shadow-card), 0 0 24px rgba(56, 189, 248, 0.12);
            background: var(--glass-hover);
        }
        .news-card-image {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .news-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition-slow);
        }
        .news-card:hover .news-card-image img {
            transform: scale(1.04);
        }
        .news-card-image .badge-overlay {
            position: absolute;
            top: 12px;
            left: 12px;
            z-index: 2;
        }
        .news-card-body {
            padding: 20px 20px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 8px 0;
            line-height: 1.45;
            letter-spacing: 0.3px;
        }
        .news-card h3 a {
            color: var(--text-primary);
            transition: color var(--transition-base);
        }
        .news-card h3 a:hover {
            color: var(--accent);
        }
        .news-card .news-summary {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0 0 14px 0;
            line-height: 1.85;
            flex: 1;
        }
        .news-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 12px;
        }
        .news-meta .meta-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }

        /* ========== Badges & Tags ========== */
        .badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 500;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .badge-accent {
            background: rgba(56, 189, 248, 0.12);
            color: var(--accent);
            border: 1px solid rgba(56, 189, 248, 0.22);
        }
        .badge-secondary {
            background: var(--secondary-soft);
            color: var(--secondary);
            border: 1px solid rgba(248, 113, 113, 0.20);
        }
        .badge-neutral {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.10);
        }

        /* ========== Sub-topic Navigation ========== */
        .topic-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 32px;
        }
        .topic-nav a {
            display: inline-block;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.10);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .topic-nav a:hover {
            color: var(--accent);
            border-color: var(--accent);
            background: rgba(56, 189, 248, 0.08);
        }

        /* ========== Featured Articles ========== */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .featured-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
            display: flex;
            flex-direction: column;
        }
        .featured-card:hover {
            transform: translateY(-3px);
            border-color: var(--glass-border-strong);
            box-shadow: var(--shadow-card);
        }
        .featured-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .featured-card-content {
            padding: 20px 22px;
        }
        .featured-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 10px 0;
            line-height: 1.5;
        }
        .featured-card p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0 0 12px 0;
            line-height: 1.85;
        }
        .featured-card .news-meta {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 10px;
            margin-top: 0;
        }

        /* ========== Stats Summary ========== */
        .stats-summary {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-mini-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
        }
        .stat-mini-card:hover {
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
        }
        .stat-mini-card .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            letter-spacing: 0.5px;
        }
        .stat-mini-card .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 6px;
            line-height: 1.5;
        }

        /* ========== Deep Topics ========== */
        .deep-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .deep-card {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 24px 22px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-float);
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .deep-card:hover {
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
            transform: translateY(-2px);
        }
        .deep-card .deep-icon {
            width: 44px;
            height: 44px;
            flex-shrink: 0;
            background: rgba(56, 189, 248, 0.10);
            border: 1px solid rgba(56, 189, 248, 0.18);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent);
        }
        .deep-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 6px 0;
            line-height: 1.5;
        }
        .deep-card p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.8;
        }

        /* ========== Subscribe CTA ========== */
        .subscribe-cta {
            background: linear-gradient(135deg, rgba(11, 18, 32, 0.9) 0%, rgba(26, 42, 66, 0.8) 50%, rgba(11, 18, 32, 0.9) 100%);
            border: 1px solid rgba(56, 189, 248, 0.20);
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .subscribe-cta::before {
            content: "";
            position: absolute;
            top: -60px;
            right: 40px;
            width: 250px;
            height: 250px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .subscribe-cta-text {
            flex: 1 1 45%;
            min-width: 280px;
            position: relative;
            z-index: 1;
        }
        .subscribe-cta-text h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 10px 0;
            line-height: 1.4;
        }
        .subscribe-cta-text p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.9;
        }
        .subscribe-form {
            flex: 1 1 40%;
            min-width: 260px;
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .subscribe-form input {
            width: 100%;
            padding: 14px 18px;
            font-size: 15px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            box-sizing: border-box;
        }
        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }
        .subscribe-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 14px rgba(56, 189, 248, 0.20);
            outline: none;
            background: rgba(255, 255, 255, 0.08);
        }
        .btn {
            display: inline-block;
            padding: 14px 28px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            text-align: center;
            letter-spacing: 0.3px;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            color: #0B1220;
            border: none;
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-2px);
            color: #0B1220;
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: 0 0 12px rgba(56, 189, 248, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--accent);
            border: 1px solid rgba(56, 189, 248, 0.35);
        }
        .btn-outline:hover {
            background: rgba(56, 189, 248, 0.08);
            border-color: var(--accent);
            color: var(--accent);
        }

        /* ========== FAQ Accordion ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 780px;
        }
        .faq-item {
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item:hover {
            border-color: var(--glass-border-strong);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            cursor: pointer;
            transition: all var(--transition-base);
            background: none;
            border: none;
        }
        .faq-question:hover {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.04);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            font-size: 20px;
            color: var(--accent);
            transition: transform var(--transition-base);
            line-height: 1;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 22px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }
        .faq-answer p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.9;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--primary-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 56px 0 24px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-brand .logo-text {
            font-size: 22px;
            margin-bottom: 12px;
            display: block;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.85;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 14px 0;
            letter-spacing: 0.5px;
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-base);
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            justify-content: space-between;
        }
        .footer-bottom p {
            font-size: 13px;
            color: var(--text-muted);
            margin: 0;
        }
        .footer-links {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 13px;
        }
        .footer-links a {
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-links a:hover {
            color: var(--accent);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-summary {
                grid-template-columns: repeat(2, 1fr);
            }
            .featured-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .deep-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .nav-cta a {
                display: none;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-padding: 48px 0;
                --header-height: 56px;
            }
            .mobile-toggle {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(8, 13, 23, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                flex-direction: column;
                padding: 16px 24px;
                gap: 4px;
                display: none;
                z-index: 999;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 12px 14px;
                font-size: 16px;
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .category-hero p {
                font-size: 15px;
            }
            .category-hero-wrapper {
                flex-direction: column;
            }
            .category-hero-image {
                max-width: 100%;
                width: 100%;
            }
            .category-hero-image img {
                height: 200px;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .featured-grid {
                grid-template-columns: 1fr;
            }
            .deep-grid {
                grid-template-columns: 1fr;
            }
            .stats-summary {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-mini-card .stat-number {
                font-size: 26px;
            }
            .subscribe-cta {
                padding: 32px 24px;
                flex-direction: column;
            }
            .subscribe-form {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .topic-nav {
                gap: 8px;
            }
            .topic-nav a {
                padding: 6px 14px;
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .category-hero {
                padding: 36px 0 40px;
            }
            .category-hero h1 {
                font-size: 22px;
            }
            .stats-summary {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-mini-card {
                padding: 16px 12px;
            }
            .stat-mini-card .stat-number {
                font-size: 24px;
            }
            .btn {
                width: 100%;
                padding: 12px 20px;
            }
            .subscribe-form input {
                padding: 12px 14px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer p {
                font-size: 14px;
            }
            .news-card-image {
                height: 160px;
            }
            .featured-card img {
                height: 170px;
            }
        }

/* roulang page: category5 */
:root {
            --primary: #0B1220;
            --primary-light: #1A2A42;
            --primary-deep: #080D17;
            --accent: #38BDF8;
            --accent-alt: #22D3EE;
            --accent-glow: rgba(56, 189, 248, 0.5);
            --secondary: #F87171;
            --secondary-soft: rgba(248, 113, 113, 0.15);
            --text-primary: #E6F1FF;
            --text-secondary: #8CA3C7;
            --text-muted: #5C7299;
            --bg-dark: #0A101E;
            --bg-medium: #0F1B30;
            --bg-light: #111E36;
            --glass: rgba(255, 255, 255, 0.06);
            --glass-hover: rgba(255, 255, 255, 0.10);
            --glass-border: rgba(255, 255, 255, 0.12);
            --glass-border-strong: rgba(56, 189, 248, 0.30);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-full: 9999px;
            --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.35);
            --shadow-float: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-btn: 0 0 18px rgba(56, 189, 248, 0.50);
            --shadow-btn-hover: 0 0 30px rgba(56, 189, 248, 0.70);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s ease;
            --section-padding: 72px 0;
            --container-max: 1200px;
            --header-height: 64px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-primary);
            background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-medium) 35%, var(--bg-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        a:hover {
            color: #7DD3FC;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 18, 32, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            height: var(--header-height);
            transition: background var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(8, 13, 23, 0.96);
            border-bottom-color: rgba(56, 189, 248, 0.20);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #0B1220;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            flex-wrap: nowrap;
        }

        .nav-links li {
            position: relative;
        }

        .nav-links a {
            display: block;
            padding: 8px 13px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .nav-links a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-links a.active {
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border-bottom: 2px solid var(--accent);
            border-radius: var(--radius-sm) var(--radius-sm) 0 0;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .nav-actions a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            white-space: nowrap;
            min-height: 40px;
        }

        .nav-action-outline {
            color: var(--accent);
            border: 1px solid rgba(56, 189, 248, 0.40);
            background: transparent;
        }

        .nav-action-outline:hover {
            color: #7DD3FC;
            border-color: rgba(56, 189, 248, 0.70);
            background: rgba(56, 189, 248, 0.08);
        }

        .nav-action-solid {
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            box-shadow: var(--shadow-btn);
        }

        .nav-action-solid:hover {
            box-shadow: var(--shadow-btn-hover);
            color: #0B1220;
            transform: translateY(-1px);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
            flex-shrink: 0;
        }

        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-base);
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        /* Main sections */
        main {
            display: block;
        }

        .section {
            padding: var(--section-padding);
        }

        .section-alt {
            background: rgba(17, 30, 54, 0.55);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.7;
        }

        /* Breadcrumb */
        .breadcrumb {
            padding: 16px 0 8px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .breadcrumb a {
            color: var(--text-secondary);
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb .sep {
            margin: 0 8px;
            color: var(--text-muted);
        }

        .breadcrumb .current {
            color: var(--accent);
        }

        /* Compact Hero for classification page */
        .compact-hero {
            padding: 36px 0 40px;
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.08) 0%, rgba(34, 211, 238, 0.04) 40%, rgba(11, 18, 32, 0.90) 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }

        .compact-hero::after {
            content: '';
            position: absolute;
            top: -60%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .compact-hero-inner {
            display: flex;
            align-items: center;
            gap: 40px;
            position: relative;
            z-index: 2;
        }

        .compact-hero-content {
            flex: 1;
            min-width: 0;
        }

        .compact-hero-content h1 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            line-height: 1.35;
            margin-bottom: 12px;
        }

        .compact-hero-content .hero-desc {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 680px;
            margin-bottom: 20px;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border: 1px solid rgba(56, 189, 248, 0.25);
            border-radius: var(--radius-full);
            white-space: nowrap;
        }

        .compact-hero-image {
            flex-shrink: 0;
            width: 300px;
            height: 200px;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow-card);
        }

        .compact-hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Hot tags / sub topic nav */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }

        .tag-cloud .tag-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-right: 4px;
            font-weight: 500;
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            white-space: nowrap;
            min-height: 40px;
        }

        .tag-chip:hover {
            color: var(--accent);
            border-color: var(--glass-border-strong);
            background: var(--glass-hover);
        }

        .tag-chip.active-tag {
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-color: transparent;
            font-weight: 600;
        }

        /* Discussion list */
        .discussion-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .discussion-item {
            display: flex;
            gap: 18px;
            padding: 20px 24px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
            align-items: flex-start;
            min-height: 100px;
            cursor: default;
        }

        .discussion-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-2px);
            box-shadow: var(--shadow-float);
        }

        .discussion-main {
            flex: 1;
            min-width: 0;
        }

        .discussion-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.5;
        }

        .discussion-summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 10px;
        }

        .discussion-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .discussion-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .discussion-tag {
            display: inline-block;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(56, 189, 248, 0.10);
            border-radius: var(--radius-full);
            white-space: nowrap;
        }

        .discussion-count {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-muted);
            flex-shrink: 0;
            padding-top: 4px;
        }

        .discussion-count .num {
            font-size: 20px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1;
        }

        /* Featured cards */
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }

        .featured-card {
            padding: 22px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .featured-card:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }

        .featured-card .fc-badge {
            display: inline-block;
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 600;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-full);
            margin-bottom: 12px;
        }

        .featured-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .featured-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .featured-card .fc-meta {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Stats summary */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .stat-item {
            text-align: center;
            padding: 24px 16px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }

        .stat-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-2px);
        }

        .stat-number {
            font-size: 34px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: 0.5px;
        }

        .stat-unit {
            font-size: 16px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .stat-desc {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Deep dive topics */
        .topic-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .topic-item {
            display: flex;
            gap: 16px;
            padding: 18px 20px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            align-items: center;
        }

        .topic-item:hover {
            background: var(--glass-hover);
            border-color: var(--glass-border-strong);
            transform: translateY(-2px);
        }

        .topic-thumb {
            flex-shrink: 0;
            width: 72px;
            height: 72px;
            border-radius: var(--radius-sm);
            overflow: hidden;
        }

        .topic-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .topic-content {
            flex: 1;
            min-width: 0;
        }

        .topic-content h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            line-height: 1.5;
        }

        .topic-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 8px;
        }

        .topic-meta {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Subscribe CTA */
        .subscribe-panel {
            padding: 48px 40px;
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(34, 211, 238, 0.06) 50%, rgba(11, 18, 32, 0.90) 100%);
            border: 1px solid rgba(56, 189, 248, 0.25);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .subscribe-panel::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, transparent 70%);
            pointer-events: none;
        }

        .subscribe-panel h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }

        .subscribe-panel p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }

        .subscribe-form {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            position: relative;
            z-index: 1;
        }

        .subscribe-form input[type="text"],
        .subscribe-form input[type="email"],
        .subscribe-form input[type="tel"] {
            flex: 1;
            min-width: 200px;
            max-width: 300px;
            padding: 12px 16px;
            font-size: 15px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .subscribe-form input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
            outline: none;
        }

        .subscribe-form button {
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 700;
            color: #0B1220;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-alt) 100%);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-base);
            min-height: 48px;
            white-space: nowrap;
        }

        .subscribe-form button:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }

        .subscribe-form button:active {
            transform: scale(0.98);
        }

        /* FAQ accordion */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            margin-bottom: 12px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--glass-border-strong);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            gap: 16px;
            transition: all var(--transition-base);
            min-height: 56px;
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(56, 189, 248, 0.10);
            color: var(--accent);
            font-size: 18px;
            font-weight: 700;
            transition: transform var(--transition-base);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
        }

        .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Source note */
        .source-note {
            padding: 24px 28px;
            background: var(--glass);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-md);
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .source-note strong {
            color: var(--text-primary);
        }

        /* Footer */
        .site-footer {
            background: rgba(8, 13, 23, 0.95);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 48px 0 24px;
            margin-top: 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-top: 10px;
            max-width: 340px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-base);
        }

        .footer-col ul a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-links {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-links a {
            color: var(--text-muted);
            font-size: 13px;
        }

        .footer-links a:hover {
            color: var(--accent);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-links {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .nav-links.mobile-open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(8, 13, 23, 0.98);
                border-bottom: 1px solid rgba(255, 255, 255, 0.10);
                padding: 16px 24px;
                gap: 4px;
                z-index: 1001;
                max-height: calc(100vh - var(--header-height));
                overflow-y: auto;
            }

            .nav-links.mobile-open li {
                width: 100%;
            }

            .nav-links.mobile-open a {
                width: 100%;
                padding: 14px 16px;
                font-size: 16px;
            }

            .nav-links.mobile-open a.active {
                border-bottom: none;
                border-left: 3px solid var(--accent);
                border-radius: var(--radius-sm);
            }

            .compact-hero-inner {
                flex-direction: column;
                gap: 24px;
            }

            .compact-hero-image {
                width: 100%;
                max-width: 500px;
                height: 220px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 48px 0;
            }

            .container {
                padding: 0 16px;
            }

            .compact-hero {
                min-height: auto;
                padding: 28px 0 32px;
            }

            .compact-hero-content h1 {
                font-size: 26px;
            }

            .section-title {
                font-size: 22px;
            }

            .discussion-item {
                flex-direction: column;
                padding: 16px 18px;
            }

            .discussion-count {
                padding-top: 0;
                align-self: flex-start;
            }

            .featured-grid {
                grid-template-columns: 1fr;
            }

            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .subscribe-panel {
                padding: 32px 20px;
            }

            .subscribe-form input[type="text"],
            .subscribe-form input[type="email"],
            .subscribe-form input[type="tel"] {
                min-width: 100%;
                max-width: 100%;
            }

            .subscribe-form button {
                width: 100%;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }

            .topic-item {
                flex-direction: column;
                align-items: flex-start;
            }

            .topic-thumb {
                width: 100%;
                height: 140px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 12px;
            }

            .logo-text {
                font-size: 18px;
            }

            .nav-actions a {
                padding: 6px 12px;
                font-size: 13px;
                min-height: 36px;
            }

            .compact-hero-content h1 {
                font-size: 22px;
            }

            .hero-badge {
                font-size: 12px;
                padding: 5px 10px;
            }

            .section-title {
                font-size: 20px;
            }

            .stats-row {
                grid-template-columns: 1fr;
            }

            .stat-number {
                font-size: 28px;
            }

            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }

            .faq-answer-inner {
                font-size: 14px;
                padding: 0 16px 14px;
            }

            .discussion-title {
                font-size: 15px;
            }

            .discussion-summary {
                font-size: 13px;
            }
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}