/* roulang page: index */
:root {
            --bg-primary: #0B0D12;
            --bg-secondary: #11151C;
            --bg-card: #161B24;
            --bg-card-hover: #1B2230;
            --text-primary: #F5F7FA;
            --text-secondary: #B8C0CC;
            --text-muted: #7A8494;
            --accent: #00E0B8;
            --accent-strong: #00C9A5;
            --accent-soft: rgba(0, 224, 184, 0.12);
            --accent-glow: rgba(0, 224, 184, 0.28);
            --secondary: #FF2E63;
            --secondary-soft: rgba(255, 46, 99, 0.12);
            --gold: #F5C542;
            --gold-soft: rgba(245, 197, 66, 0.12);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 999px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 24px rgba(0, 224, 184, 0.18);
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        ::selection {
            background-color: var(--accent);
            color: #0B0D12;
        }

        /* Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition-base), border-color var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(11, 13, 18, 0.98);
            border-bottom-color: var(--border-strong);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

        .nav-logo:hover {
            color: var(--accent);
        }

        .nav-logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .nav-link.active {
            color: var(--accent);
            background: var(--accent-soft);
        }

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

        .nav-cta-btn {
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
        }

        .nav-cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-primary);
            font-size: 1.2rem;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .mobile-toggle:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: 16px 24px 24px;
            background: rgba(11, 13, 18, 0.98);
            border-bottom: 1px solid var(--border-color);
            animation: slideDown var(--transition-base);
        }

        .mobile-menu .nav-link {
            padding: 12px 16px;
            font-size: 1rem;
            border-radius: var(--radius-sm);
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-8px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Announcement chips */
        .announcement-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            flex-wrap: wrap;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            background: rgba(11, 13, 18, 0.6);
        }

        .announcement-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            background: rgba(255, 46, 99, 0.1);
            border: 1px solid rgba(255, 46, 99, 0.22);
            color: var(--secondary);
            font-size: 0.78rem;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .announcement-chip:hover {
            background: rgba(255, 46, 99, 0.2);
            border-color: var(--secondary);
            color: #fff;
        }

        .announcement-chip.gold {
            background: var(--gold-soft);
            border-color: rgba(245, 197, 66, 0.28);
            color: var(--gold);
        }

        .announcement-chip.gold:hover {
            background: rgba(245, 197, 66, 0.2);
            border-color: var(--gold);
            color: #fff;
        }

        .announcement-chip.cyan {
            background: var(--accent-soft);
            border-color: rgba(0, 224, 184, 0.28);
            color: var(--accent);
        }

        .announcement-chip.cyan:hover {
            background: rgba(0, 224, 184, 0.2);
            border-color: var(--accent);
            color: #fff;
        }

        /* Section base */
        .section {
            padding: 80px 0;
            position: relative;
        }

        .section-alt {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .section-header {
            max-width: 720px;
            margin-bottom: 48px;
        }

        .section-header.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 16px;
            border-radius: var(--radius-full);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }

        .section-tag.secondary {
            background: var(--secondary-soft);
            color: var(--secondary);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            letter-spacing: 0.01em;
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.9;
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }

        /* Cards */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }

        .card:hover {
            background: var(--bg-card-hover);
            border-color: var(--accent-strong);
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
        }

        .card:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .card-icon {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.3rem;
            margin-bottom: 20px;
        }

        .card-icon.secondary {
            background: var(--secondary-soft);
            color: var(--secondary);
        }

        .card-icon.gold {
            background: var(--gold-soft);
            color: var(--gold);
        }

        .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .card-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            cursor: pointer;
            border: none;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--accent);
            color: #0B0D12;
        }
        .btn-primary:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent);
            border: 1px solid var(--accent);
        }
        .btn-secondary:hover {
            background: var(--accent-soft);
            border-color: var(--accent-strong);
            transform: translateY(-2px);
        }
        .btn-secondary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-primary);
            border-color: var(--border-strong);
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }

        /* Badge */
        .badge {
            display: inline-block;
            padding: 3px 12px;
            border-radius: var(--radius-full);
            font-size: 0.72rem;
            font-weight: 700;
            background: var(--secondary-soft);
            color: var(--secondary);
            letter-spacing: 0.02em;
        }

        .badge.gold {
            background: var(--gold-soft);
            color: var(--gold);
        }

        .badge.cyan {
            background: var(--accent-soft);
            color: var(--accent);
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            padding: 80px 0;
            background: var(--bg-primary);
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/c0ab1e8cb3858232.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.22;
            z-index: 0;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 13, 18, 0.72) 0%, rgba(11, 13, 18, 0.88) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 700px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: var(--radius-full);
            background: rgba(0, 224, 184, 0.1);
            border: 1px solid rgba(0, 224, 184, 0.25);
            color: var(--accent);
            font-size: 0.82rem;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 900;
            line-height: 1.25;
            letter-spacing: 0.01em;
            margin-bottom: 20px;
            color: var(--text-primary);
        }

        .hero-title .highlight {
            color: var(--accent);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.9;
            margin-bottom: 32px;
            max-width: 600px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .hero-stats {
            display: flex;
            gap: 32px;
            margin-top: 40px;
            flex-wrap: wrap;
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-value {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--accent);
        }

        .hero-stat-label {
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .hero {
                min-height: auto;
                padding: 56px 0;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
        }

        /* Before / After comparison in hero */
        .hero-comparison {
            position: relative;
            z-index: 2;
            background: var(--bg-card);
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-lg);
            max-width: 400px;
            display: none;
        }

        .comparison-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            text-align: center;
        }

        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .comparison-item {
            padding: 16px;
            border-radius: var(--radius-sm);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            text-align: center;
        }

        .comparison-item.before {
            border-color: rgba(255, 46, 99, 0.3);
        }

        .comparison-item.after {
            border-color: rgba(0, 224, 184, 0.3);
        }

        .comparison-label {
            font-size: 0.72rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 6px;
        }

        .comparison-item.before .comparison-label {
            color: var(--secondary);
        }

        .comparison-item.after .comparison-label {
            color: var(--accent);
        }

        .comparison-value {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-primary);
        }

        @media (min-width: 1024px) {
            .hero-comparison {
                display: block;
            }
            .hero-grid {
                display: grid;
                grid-template-columns: 1fr 400px;
                gap: 48px;
                align-items: center;
            }
        }

        /* KPI */
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .kpi-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            text-align: center;
            transition: all var(--transition-base);
        }

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

        .kpi-value {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 8px;
        }

        .kpi-value.gold {
            color: var(--gold);
        }

        .kpi-value.secondary {
            color: var(--secondary);
        }

        .kpi-label {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }

        @media (max-width: 768px) {
            .kpi-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .kpi-value {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .kpi-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Grid layouts */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .grid-3,
            .grid-4,
            .grid-2 {
                grid-template-columns: 1fr;
            }
        }

        /* Milestone timeline */
        .timeline {
            position: relative;
            padding-left: 32px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-strong);
        }

        .timeline-item {
            position: relative;
            padding-bottom: 36px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-dot {
            position: absolute;
            left: -32px;
            top: 5px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--accent);
            border: 3px solid var(--bg-primary);
            box-shadow: 0 0 0 2px rgba(0, 224, 184, 0.35);
        }

        .timeline-year {
            font-size: 0.85rem;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 4px;
        }

        .timeline-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .timeline-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* News list */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .news-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-color);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .news-item:hover {
            padding-left: 12px;
            border-bottom-color: var(--accent-strong);
        }

        .news-item:last-child {
            border-bottom: none;
        }

        .news-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.6;
        }

        .news-item:hover .news-title {
            color: var(--accent);
        }

        .news-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
            flex-shrink: 0;
        }

        @media (max-width: 640px) {
            .news-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

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

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

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

        .faq-item.active {
            border-color: var(--accent-strong);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 20px 24px;
            background: transparent;
            border: none;
            cursor: pointer;
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-primary);
            text-align: left;
            transition: all var(--transition-fast);
        }

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

        .faq-question:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: -2px;
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            transition: transform var(--transition-base);
            color: var(--text-muted);
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-answer p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.9;
        }

        /* Testimonials */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all var(--transition-base);
        }

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

        .testimonial-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
            font-style: italic;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--accent-soft);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .testimonial-name {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
        }

        .testimonial-role {
            font-size: 0.78rem;
            color: var(--text-muted);
        }

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

        @media (max-width: 640px) {
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Topic cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .topic-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
            cursor: pointer;
            aspect-ratio: 4/3;
            background: var(--bg-card);
        }

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

        .topic-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-base);
        }

        .topic-card:hover img {
            transform: scale(1.06);
        }

        .topic-card-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 30%, rgba(11, 13, 18, 0.9) 100%);
            display: flex;
            align-items: flex-end;
            padding: 16px;
        }

        .topic-card-title {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            z-index: 2;
        }

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

        @media (max-width: 640px) {
            .topic-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Form */
        .form-input {
            width: 100%;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: all var(--transition-fast);
        }

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

        .form-input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 224, 184, 0.15);
        }

        .form-input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* Partners */
        .partner-wall {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }

        .partner-logo {
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-muted);
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .partner-logo:hover {
            border-color: var(--border-strong);
            color: var(--text-primary);
            box-shadow: var(--shadow-sm);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 64px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .footer-col-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-link {
            display: block;
            padding: 6px 0;
            font-size: 0.88rem;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
        }

        .footer-link:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .site-footer {
                padding: 48px 0 24px;
            }
        }

        /* Utility */
        .text-accent {
            color: var(--accent);
        }
        .text-secondary {
            color: var(--secondary);
        }
        .text-gold {
            color: var(--gold);
        }
        .bg-card {
            background: var(--bg-card);
        }
        .border-accent {
            border-color: rgba(0, 224, 184, 0.3);
        }

        /* Mobile nav */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .mobile-menu.open {
                display: flex;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu {
                display: none !important;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0B0D12;
            --bg-secondary: #11151C;
            --bg-card: #161B24;
            --bg-card-hover: #1B2230;
            --text-primary: #F5F7FA;
            --text-secondary: #B8C0CC;
            --text-muted: #7A8494;
            --accent: #00E0B8;
            --accent-strong: #00C9A5;
            --accent-soft: rgba(0, 224, 184, 0.12);
            --accent-glow: rgba(0, 224, 184, 0.28);
            --secondary: #FF2E63;
            --secondary-soft: rgba(255, 46, 99, 0.12);
            --gold: #F5C542;
            --gold-soft: rgba(245, 197, 66, 0.12);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 999px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 24px rgba(0, 224, 184, 0.18);
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition-base), border-color var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(11, 13, 18, 0.98);
            border-bottom-color: var(--border-strong);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

        .nav-logo:hover {
            color: var(--accent);
        }

        .nav-logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .nav-link.active {
            color: var(--accent);
            background: var(--accent-soft);
        }

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

        .nav-cta-btn {
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            color: #0B0D12;
        }

        .nav-cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-primary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .mobile-toggle:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        .announcement-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0 12px;
            flex-wrap: wrap;
        }

        .announcement-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--accent-soft);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: all var(--transition-fast);
            cursor: default;
        }

        .announcement-chip.cyan {
            background: var(--accent-soft);
            color: var(--accent);
        }

        .announcement-chip.gold {
            background: var(--gold-soft);
            color: var(--gold);
        }

        .mobile-menu {
            display: none;
            background: rgba(11, 13, 18, 0.98);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 24px;
            flex-direction: column;
            gap: 4px;
        }

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

        @media (max-width: 1024px) {
            .nav-links {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .nav-cta-btn {
                display: none;
            }
            .announcement-bar {
                padding-bottom: 10px;
            }
            .mobile-menu .nav-link {
                display: block;
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
        }

        @media (min-width: 1025px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* Breadcrumb */
        .breadcrumb-section {
            padding: 20px 0 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .separator {
            color: var(--border-strong);
        }
        .breadcrumb .current {
            color: var(--accent);
        }

        /* Category Hero (compact banner) */
        .category-hero {
            padding: 30px 0 28px;
            border-bottom: 1px solid var(--border-color);
            background: var(--bg-primary);
        }
        .category-hero-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .category-hero-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 0.01em;
            color: var(--text-primary);
            margin: 0;
            line-height: 1.3;
        }
        .category-hero-sub {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-top: 6px;
        }
        .hero-chips {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        /* Section */
        .section {
            padding: 56px 0;
        }
        .section-dark {
            background: var(--bg-primary);
        }
        .section-alt {
            background: var(--bg-secondary);
        }
        .section-title {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .section-desc {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 1rem;
            max-width: 720px;
        }

        /* Cards */
        .guide-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            background: var(--bg-card-hover);
        }
        .guide-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .guide-card-body {
            padding: 18px 18px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .guide-card-category {
            display: inline-flex;
            align-self: flex-start;
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: var(--radius-full);
            margin-bottom: 10px;
            border: 1px solid var(--border-color);
        }
        .guide-card-category.secondary {
            background: var(--secondary-soft);
            color: var(--secondary);
        }
        .guide-card-category.gold {
            background: var(--gold-soft);
            color: var(--gold);
        }
        .guide-card-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .guide-card-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }
        .guide-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-color);
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .guide-card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* Difficulty tag */
        .difficulty-tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-sm);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 0.85rem;
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .difficulty-tag:hover,
        .difficulty-tag.active-tag {
            border-color: var(--accent);
            color: var(--accent);
            background: var(--accent-soft);
        }

        /* Filter bar */
        .filter-bar {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
            margin-bottom: 24px;
        }

        /* Update list */
        .update-list-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-color);
            transition: all var(--transition-fast);
        }
        .update-list-item:hover {
            padding-left: 8px;
            border-bottom-color: var(--accent);
        }
        .update-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
            min-width: 90px;
        }
        .update-content {
            color: var(--text-primary);
            font-size: 0.95rem;
        }
        .update-content a {
            color: var(--text-primary);
        }
        .update-content a:hover {
            color: var(--accent);
        }

        /* Author card */
        .author-card {
            display: flex;
            align-items: center;
            gap: 14px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px;
            transition: all var(--transition-fast);
        }
        .author-card:hover {
            border-color: var(--secondary);
            transform: translateY(-2px);
        }
        .author-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-weight: 700;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .author-info .author-name {
            font-weight: 700;
            color: var(--text-primary);
        }
        .author-info .author-role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background: var(--bg-card);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-strong);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 20px;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .faq-question i {
            color: var(--accent);
            transition: transform var(--transition-fast);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base);
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        /* CTA */
        .cta-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px;
            text-align: center;
            box-shadow: var(--shadow-md);
        }
        .cta-box h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .cta-box p {
            color: var(--text-secondary);
            margin-bottom: 20px;
        }
        .cta-btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .cta-btn-primary:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            color: #0B0D12;
        }
        .cta-btn-primary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary);
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 12px;
            max-width: 300px;
        }
        .footer-col-title {
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            font-size: 1rem;
        }
        .footer-link {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }
        .footer-link:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0B0D12;
            --bg-secondary: #11151C;
            --bg-card: #161B24;
            --bg-card-hover: #1B2230;
            --text-primary: #F5F7FA;
            --text-secondary: #B8C0CC;
            --text-muted: #7A8494;
            --accent: #00E0B8;
            --accent-strong: #00C9A5;
            --accent-soft: rgba(0, 224, 184, 0.12);
            --accent-glow: rgba(0, 224, 184, 0.28);
            --secondary: #FF2E63;
            --secondary-soft: rgba(255, 46, 99, 0.12);
            --gold: #F5C542;
            --gold-soft: rgba(245, 197, 66, 0.12);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 999px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 24px rgba(0, 224, 184, 0.18);
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition-base), border-color var(--transition-base);
        }
        .site-header.scrolled {
            background: rgba(11, 13, 18, 0.98);
            border-bottom-color: var(--border-strong);
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }
        .nav-logo:hover {
            color: var(--accent);
        }
        .nav-logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        .nav-link.active {
            color: var(--accent);
            background: var(--accent-soft);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .nav-cta-btn {
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .nav-cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .nav-cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-primary);
            cursor: pointer;
            font-size: 1.2rem;
            transition: all var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: var(--border-strong);
        }

        /* Announcement bar */
        .announcement-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 0 12px;
            flex-wrap: wrap;
        }
        .announcement-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            cursor: default;
            white-space: nowrap;
        }
        .announcement-chip:hover {
            border-color: var(--border-strong);
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.09);
        }
        .announcement-chip.cyan {
            color: var(--accent);
            background: var(--accent-soft);
            border-color: rgba(0, 224, 184, 0.25);
        }
        .announcement-chip.gold {
            color: var(--gold);
            background: var(--gold-soft);
            border-color: rgba(245, 197, 66, 0.25);
        }
        .announcement-chip.red {
            color: var(--secondary);
            background: var(--secondary-soft);
            border-color: rgba(255, 46, 99, 0.25);
        }

        /* Mobile menu */
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: rgba(11, 13, 18, 0.98);
            border-top: 1px solid var(--border-color);
            padding: 12px 24px 20px;
            gap: 4px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu .nav-link {
            display: block;
            padding: 12px 0;
            font-size: 1.05rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            border-radius: 0;
        }
        .mobile-menu .nav-link:last-child {
            border-bottom: none;
        }

        /* Breadcrumb */
        .breadcrumb-section {
            padding: 20px 0 0;
            background: var(--bg-primary);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .separator {
            color: var(--text-muted);
            opacity: 0.5;
            font-size: 0.7rem;
        }
        .breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 600;
        }

        /* Compact Hero */
        .category-hero {
            padding: 28px 0 32px;
            background: var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
        }
        .category-hero-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .category-hero-title {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: 0.01em;
            color: var(--text-primary);
            line-height: 1.3;
        }
        .category-hero-title .highlight {
            color: var(--accent);
        }
        .category-hero-sub {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-top: 8px;
            max-width: 560px;
            line-height: 1.7;
        }
        .category-hero-chips {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .category-hero-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--accent-soft);
            color: var(--accent);
            border: 1px solid rgba(0, 224, 184, 0.25);
        }
        .category-hero-chip.gold {
            background: var(--gold-soft);
            color: var(--gold);
            border-color: rgba(245, 197, 66, 0.25);
        }
        .category-hero-chip.red {
            background: var(--secondary-soft);
            color: var(--secondary);
            border-color: rgba(255, 46, 99, 0.25);
        }

        /* Section base */
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background: var(--bg-secondary);
        }
        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 16px;
            margin-bottom: 28px;
            flex-wrap: wrap;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            letter-spacing: 0.01em;
            color: var(--text-primary);
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 6px;
            max-width: 540px;
            line-height: 1.7;
        }
        .section-link {
            font-size: 0.9rem;
            color: var(--accent);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .section-link:hover {
            color: var(--accent-strong);
            gap: 10px;
        }

        /* Filter bar */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            padding: 16px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
        }
        .filter-select {
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 0.9rem;
            cursor: pointer;
            min-width: 140px;
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A8494' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 14px center;
            padding-right: 36px;
            transition: all var(--transition-fast);
        }
        .filter-select:hover {
            border-color: var(--border-strong);
        }
        .filter-select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-soft);
        }
        .filter-btn {
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .filter-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .filter-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .filter-btn.secondary {
            background: transparent;
            border: 1px solid var(--accent);
            color: var(--accent);
        }
        .filter-btn.secondary:hover {
            background: var(--accent-soft);
            box-shadow: none;
        }

        /* Match data cards */
        .match-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .match-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 22px 24px;
            transition: all var(--transition-base);
            cursor: pointer;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .match-card:hover {
            border-color: var(--accent);
            background: var(--bg-card-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .match-card-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
        }
        .match-tournament {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--gold);
            background: var(--gold-soft);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            border: 1px solid rgba(245, 197, 66, 0.25);
        }
        .match-date {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .match-teams {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }
        .match-team {
            flex: 1;
            text-align: center;
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .match-team.winner {
            color: var(--accent);
        }
        .match-score {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.05em;
            flex-shrink: 0;
            min-width: 80px;
            text-align: center;
        }
        .match-score .win {
            color: var(--accent);
        }
        .match-score .lose {
            color: var(--text-muted);
        }
        .match-stats {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .stat-tag {
            padding: 5px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .stat-tag i {
            font-size: 0.7rem;
            color: var(--accent);
        }
        .match-actions {
            display: flex;
            gap: 12px;
            padding-top: 4px;
        }
        .match-more {
            font-size: 0.88rem;
            color: var(--accent);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition-fast);
        }
        .match-more:hover {
            color: var(--accent-strong);
            gap: 10px;
        }

        /* Hot matches */
        .hot-match-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .hot-match-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            transition: all var(--transition-base);
            cursor: pointer;
        }
        .hot-match-item:hover {
            border-color: var(--accent);
            background: var(--bg-card-hover);
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .hot-match-rank {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 1rem;
            flex-shrink: 0;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.05);
        }
        .hot-match-rank.top1 {
            color: var(--gold);
            background: var(--gold-soft);
            border: 1px solid rgba(245, 197, 66, 0.25);
        }
        .hot-match-rank.top2 {
            color: var(--accent);
            background: var(--accent-soft);
            border: 1px solid rgba(0, 224, 184, 0.25);
        }
        .hot-match-rank.top3 {
            color: var(--secondary);
            background: var(--secondary-soft);
            border: 1px solid rgba(255, 46, 99, 0.25);
        }
        .hot-match-info {
            flex: 1;
            min-width: 0;
        }
        .hot-match-title {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .hot-match-meta {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-top: 2px;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .hot-match-viewers {
            flex-shrink: 0;
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--accent);
            white-space: nowrap;
        }

        /* Data note */
        .data-note-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .data-note-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-base);
        }
        .data-note-card:hover {
            border-color: var(--border-color);
            background: var(--bg-card-hover);
            box-shadow: var(--shadow-sm);
        }
        .data-note-icon {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.2rem;
            margin-bottom: 14px;
        }
        .data-note-title {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .data-note-text {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Subscribe CTA */
        .subscribe-cta {
            background: linear-gradient(135deg, rgba(0, 224, 184, 0.08), rgba(17, 21, 28, 0.95));
            border: 1px solid rgba(0, 224, 184, 0.2);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .subscribe-content {
            flex: 1;
            min-width: 280px;
        }
        .subscribe-title {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .subscribe-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            max-width: 480px;
            line-height: 1.7;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            min-width: 280px;
        }
        .subscribe-input {
            flex: 1;
            min-width: 200px;
            padding: 12px 18px;
            border-radius: var(--radius-sm);
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-size: 0.9rem;
            transition: all var(--transition-fast);
        }
        .subscribe-input::placeholder {
            color: var(--text-muted);
        }
        .subscribe-input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-soft);
        }
        .subscribe-btn {
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .subscribe-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .subscribe-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-strong);
        }
        .faq-item.open {
            border-color: var(--accent);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            transition: all var(--transition-fast);
            user-select: none;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-muted);
            font-size: 0.8rem;
            transition: all var(--transition-fast);
        }
        .faq-item.open .faq-question .faq-icon {
            background: var(--accent-soft);
            color: var(--accent);
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-content {
            padding: 0 22px 20px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Data sources */
        .source-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .source-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px 18px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }
        .source-item:hover {
            border-color: var(--border-strong);
            background: var(--bg-card-hover);
            box-shadow: var(--shadow-sm);
        }
        .source-item-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-muted);
            font-size: 1rem;
            flex-shrink: 0;
        }
        .source-item-name {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.3;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 56px 0 28px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.01em;
        }
        .footer-link {
            display: block;
            font-size: 0.88rem;
            color: var(--text-muted);
            padding: 5px 0;
            transition: all var(--transition-fast);
        }
        .footer-link:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-links {
                gap: 0;
            }
            .nav-link {
                padding: 8px 10px;
                font-size: 0.88rem;
            }
            .match-grid {
                grid-template-columns: 1fr;
            }
            .data-note-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .source-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .subscribe-cta {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .container {
                padding: 0 16px;
            }
            .category-hero-title {
                font-size: 1.5rem;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .match-teams {
                flex-direction: column;
                align-items: center;
            }
            .match-score {
                min-width: auto;
                font-size: 1.5rem;
            }
            .data-note-grid {
                grid-template-columns: 1fr;
            }
            .source-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-desc {
                max-width: 100%;
            }
            .announcement-bar {
                padding: 6px 0 10px;
                gap: 6px;
            }
            .announcement-chip {
                font-size: 0.72rem;
                padding: 4px 10px;
            }
            .breadcrumb-section {
                padding: 12px 0 0;
            }
            .category-hero {
                padding: 20px 0 24px;
            }
            .filter-bar {
                gap: 8px;
            }
            .filter-select {
                min-width: 120px;
                padding: 8px 12px;
                padding-right: 30px;
                font-size: 0.82rem;
            }
            .subscribe-cta {
                padding: 32px 24px;
            }
        }

        @media (max-width: 520px) {
            .nav-wrapper {
                min-height: 60px;
                gap: 8px;
            }
            .nav-logo {
                font-size: 1.1rem;
                gap: 6px;
            }
            .nav-logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            .mobile-toggle {
                width: 36px;
                height: 36px;
                font-size: 1rem;
            }
            .category-hero-title {
                font-size: 1.25rem;
            }
            .category-hero-sub {
                font-size: 0.85rem;
            }
            .match-card {
                padding: 16px 18px;
            }
            .match-team {
                font-size: 0.95rem;
            }
            .match-score {
                font-size: 1.3rem;
            }
            .source-grid {
                grid-template-columns: 1fr;
            }
            .filter-btn {
                padding: 8px 16px;
                font-size: 0.82rem;
            }
            .filter-select {
                min-width: 100%;
                width: 100%;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-answer-content {
                padding: 0 16px 14px;
                font-size: 0.85rem;
            }
            .subscribe-title {
                font-size: 1.2rem;
            }
            .subscribe-input {
                width: 100%;
                min-width: 100%;
            }
            .subscribe-btn {
                width: 100%;
                text-align: center;
            }
            .hot-match-item {
                padding: 12px 14px;
                gap: 10px;
            }
            .hot-match-title {
                font-size: 0.88rem;
            }
            .hot-match-rank {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
            }
            .data-note-card {
                padding: 18px;
            }
            .section-header {
                gap: 8px;
            }
            .section-title {
                font-size: 1.2rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0B0D12;
            --bg-secondary: #11151C;
            --bg-card: #161B24;
            --bg-card-hover: #1B2230;
            --text-primary: #F5F7FA;
            --text-secondary: #B8C0CC;
            --text-muted: #7A8494;
            --accent: #00E0B8;
            --accent-strong: #00C9A5;
            --accent-soft: rgba(0, 224, 184, 0.12);
            --accent-glow: rgba(0, 224, 184, 0.28);
            --secondary: #FF2E63;
            --secondary-soft: rgba(255, 46, 99, 0.12);
            --gold: #F5C542;
            --gold-soft: rgba(245, 197, 66, 0.12);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 999px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 24px rgba(0, 224, 184, 0.18);
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .nav-logo:hover {
            color: var(--accent);
        }

        .nav-logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        .nav-link.active {
            color: var(--accent);
            background: var(--accent-soft);
        }

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

        .nav-cta-btn {
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .nav-cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
            color: #0B0D12;
        }
        .nav-cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-primary);
            cursor: pointer;
            font-size: 1.2rem;
            transition: all var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.05);
            color: var(--accent);
        }

        .announcement-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            padding: 8px 0 12px;
        }
        .announcement-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 500;
            background: rgba(255, 46, 99, 0.12);
            color: #FF7B9C;
            border: 1px solid rgba(255, 46, 99, 0.18);
            white-space: nowrap;
        }
        .announcement-chip.cyan {
            background: var(--accent-soft);
            color: var(--accent);
            border-color: rgba(0, 224, 184, 0.18);
        }
        .announcement-chip.gold {
            background: var(--gold-soft);
            color: var(--gold);
            border-color: rgba(245, 197, 66, 0.18);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 8px 16px 16px;
            border-top: 1px solid var(--border-color);
            background: rgba(11, 13, 18, 0.98);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu .nav-link {
            padding: 12px 16px;
            width: 100%;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            opacity: 0.5;
        }
        .breadcrumb .current {
            color: var(--accent);
            font-weight: 500;
        }

        .page-hero {
            background-color: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
            padding: 32px 0 36px;
        }
        .page-hero-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .page-hero-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.01em;
            margin: 8px 0 0;
            line-height: 1.4;
        }
        .page-hero-sub {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-top: 8px;
            max-width: 640px;
        }
        .page-hero-chips {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .section {
            padding: 60px 0;
        }
        .section-alt {
            background-color: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.5;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 28px;
            max-width: 720px;
        }

        .filter-bar {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            padding: 16px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
        }
        .filter-label {
            font-size: 0.88rem;
            color: var(--text-muted);
            white-space: nowrap;
        }
        .filter-btn {
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 0.86rem;
            font-weight: 500;
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .filter-btn:hover {
            color: var(--text-primary);
            border-color: var(--border-strong);
            background: rgba(255, 255, 255, 0.04);
        }
        .filter-btn.active {
            background: var(--accent-soft);
            color: var(--accent);
            border-color: rgba(0, 224, 184, 0.25);
        }

        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .guide-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            transform: translateY(-6px);
            border-color: var(--accent-glow);
            box-shadow: var(--shadow-lg);
            background: var(--bg-card-hover);
        }
        .guide-card-img-wrap {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
        }
        .guide-card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .guide-card:hover .guide-card-img-wrap img {
            transform: scale(1.05);
        }
        .guide-card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 3px 12px;
            border-radius: var(--radius-full);
            font-size: 0.76rem;
            font-weight: 600;
            background: var(--secondary-soft);
            color: #FF7B9C;
            border: 1px solid rgba(255, 46, 99, 0.2);
        }
        .guide-card-badge.gold {
            background: var(--gold-soft);
            color: var(--gold);
            border-color: rgba(245, 197, 66, 0.2);
        }
        .guide-card-badge.cyan {
            background: var(--accent-soft);
            color: var(--accent);
            border-color: rgba(0, 224, 184, 0.2);
        }
        .guide-card-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .guide-card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.5;
        }
        .guide-card-desc {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }
        .guide-card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            font-size: 0.8rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-color);
            padding-top: 12px;
        }
        .guide-card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .topic-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .topic-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all var(--transition-base);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .topic-item:hover {
            border-color: var(--accent-glow);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
        }
        .topic-icon {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1rem;
            flex-shrink: 0;
        }
        .topic-name {
            font-weight: 600;
            font-size: 0.95rem;
        }
        .topic-count {
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        .update-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .update-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .update-item:last-child {
            border-bottom: none;
        }
        .update-tag {
            padding: 3px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
            background: var(--accent-soft);
            color: var(--accent);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .update-tag.secondary {
            background: var(--secondary-soft);
            color: #FF7B9C;
        }
        .update-tag.gold {
            background: var(--gold-soft);
            color: var(--gold);
        }
        .update-info h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .update-info p {
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        .author-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .author-card {
            text-align: center;
            padding: 24px 16px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }
        .author-card:hover {
            transform: translateY(-3px);
            border-color: var(--accent-glow);
        }
        .author-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--accent-soft);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin: 0 auto 12px;
        }
        .author-name {
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 4px;
        }
        .author-role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .cta-box {
            background: var(--bg-card);
            border: 1px solid rgba(0, 224, 184, 0.2);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .cta-box h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .cta-box p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .cta-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .cta-input {
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: var(--bg-primary);
            color: var(--text-primary);
            min-width: 240px;
            font-size: 0.9rem;
        }
        .cta-input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-soft);
        }
        .cta-btn {
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
        }
        .cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }
        .faq-item.open {
            border-color: rgba(0, 224, 184, 0.25);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 20px;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-size: 0.98rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question .faq-icon {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            padding: 0 20px 16px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        .site-footer {
            background-color: #080A0E;
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .footer-link {
            display: block;
            color: var(--text-muted);
            font-size: 0.88rem;
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }
        .footer-link:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            font-size: 0.82rem;
            color: var(--text-muted);
            text-align: center;
        }

        @media (max-width: 1024px) {
            .guide-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .topic-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .author-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-hero-title {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .nav-cta-btn {
                display: none;
            }
            .mobile-toggle {
                display: inline-flex;
            }
            .guide-grid {
                grid-template-columns: 1fr;
            }
            .page-hero-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .section {
                padding: 40px 0;
            }
            .cta-box {
                flex-direction: column;
                align-items: flex-start;
                padding: 24px 20px;
            }
        }

        @media (max-width: 520px) {
            .topic-list {
                grid-template-columns: 1fr;
            }
            .author-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .container {
                padding: 0 16px;
            }
            .page-hero-title {
                font-size: 1.45rem;
            }
            .filter-bar {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #0B0D12;
            --bg-secondary: #11151C;
            --bg-card: #161B24;
            --bg-card-hover: #1B2230;
            --text-primary: #F5F7FA;
            --text-secondary: #B8C0CC;
            --text-muted: #7A8494;
            --accent: #00E0B8;
            --accent-strong: #00C9A5;
            --accent-soft: rgba(0, 224, 184, 0.12);
            --accent-glow: rgba(0, 224, 184, 0.28);
            --secondary: #FF2E63;
            --secondary-soft: rgba(255, 46, 99, 0.12);
            --gold: #F5C542;
            --gold-soft: rgba(245, 197, 66, 0.12);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 999px;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 24px rgba(0, 224, 184, 0.18);
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.45s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        /* Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition-base), border-color var(--transition-base);
        }

        .site-header.scrolled {
            background: rgba(11, 13, 18, 0.98);
            border-bottom-color: var(--border-strong);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .nav-logo:hover {
            color: var(--accent);
        }

        .nav-logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .nav-link.active {
            color: var(--accent);
            background: var(--accent-soft);
        }

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

        .nav-cta-btn {
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-cta-btn:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
        }

        .nav-cta-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .mobile-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            background: transparent;
            color: var(--text-primary);
            font-size: 1.25rem;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .mobile-toggle:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        .announcement-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0 10px;
            flex-wrap: wrap;
        }

        .announcement-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            white-space: nowrap;
            transition: all var(--transition-fast);
        }

        .announcement-chip i {
            font-size: 0.75rem;
        }

        .announcement-chip.cyan {
            color: var(--accent);
            background: var(--accent-soft);
            border-color: rgba(0, 224, 184, 0.25);
        }

        .announcement-chip.gold {
            color: var(--gold);
            background: var(--gold-soft);
            border-color: rgba(245, 197, 66, 0.25);
        }

        .announcement-chip:hover {
            border-color: var(--accent);
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.08);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 12px 24px 20px;
            border-top: 1px solid var(--border-color);
            background: rgba(11, 13, 18, 0.98);
        }

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

        .mobile-menu .nav-link {
            display: block;
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
        }

        /* Page Hero Banner */
        .page-hero-banner {
            background: linear-gradient(rgba(11, 13, 18, 0.82), rgba(11, 13, 18, 0.9)), url('/assets/images/c0ab1e8cb3858232.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--border-color);
            padding: 36px 0 32px;
        }

        .hero-banner-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            min-width: 140px;
        }

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

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

        .breadcrumb span {
            color: var(--text-muted);
        }

        .hero-banner-inner h1 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            margin: 0;
            flex: 1;
            min-width: 240px;
        }

        .hero-announcement-chips {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: flex-end;
        }

        /* Section */
        .section {
            padding: 72px 0;
            background: var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
        }

        .section-alt {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
        }

        .section-head {
            margin-bottom: 36px;
        }

        .section-head h2 {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: 0.01em;
        }

        .section-head p {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.9;
        }

        /* Metric Cards */
        .metric-card-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .metric-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

        .metric-card:hover {
            transform: translateY(-4px);
            background: var(--bg-card-hover);
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }

        .metric-card .metric-label {
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--text-muted);
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .metric-card .metric-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 8px;
        }

        .metric-card .metric-note {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Table */
        .table-responsive {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            margin-top: 20px;
        }

        .data-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 700px;
            font-size: 0.95rem;
        }

        .data-table th {
            background: var(--bg-card-hover);
            color: var(--text-secondary);
            font-weight: 700;
            text-align: left;
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-strong);
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .data-table td {
            padding: 14px 20px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-primary);
            vertical-align: middle;
        }

        .data-table tbody tr {
            transition: background var(--transition-fast);
        }

        .data-table tbody tr:hover {
            background: rgba(255, 255, 255, 0.03);
        }

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

        .data-table .win-rate-high {
            color: var(--accent);
            font-weight: 700;
        }

        .data-table .win-rate-mid {
            color: var(--gold);
            font-weight: 700;
        }

        .data-table .win-rate-low {
            color: var(--secondary);
            font-weight: 700;
        }

        .trend-chart-placeholder {
            position: relative;
            margin-top: 24px;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background: var(--bg-card);
            min-height: 280px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .trend-chart-placeholder img {
            width: 100%;
            height: 280px;
            object-fit: cover;
            opacity: 0.6;
        }

        .chart-overlay {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 10px;
            text-align: center;
            padding: 20px;
            background: rgba(11, 13, 18, 0.5);
        }

        .chart-overlay h3 {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-primary);
        }

        .chart-overlay p {
            font-size: 0.95rem;
            color: var(--text-secondary);
        }

        /* Two Column Grid */
        .two-col-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .info-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-base);
        }

        .info-card:hover {
            border-color: var(--border-strong);
            background: var(--bg-card-hover);
        }

        .info-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .info-card h3 i {
            color: var(--accent);
        }

        .info-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .info-card ul {
            list-style: none;
            margin-top: 12px;
        }

        .info-card ul li {
            padding: 8px 0;
            font-size: 0.95rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid var(--border-color);
        }

        .info-card ul li:last-child {
            border-bottom: none;
        }

        .info-card ul li i {
            color: var(--gold);
            font-size: 0.75rem;
            width: 16px;
            text-align: center;
        }

        /* Version Compare */
        .version-compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .version-compare-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-base);
        }

        .version-compare-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }

        .version-compare-card .version-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 700;
            background: var(--accent-soft);
            color: var(--accent);
            margin-bottom: 14px;
        }

        .version-compare-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .version-compare-card .compare-diff {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 8px;
        }

        .version-compare-card .compare-diff.up {
            color: var(--accent);
        }

        .version-compare-card .compare-diff.down {
            color: var(--secondary);
        }

        .version-compare-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Method List */
        .method-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .method-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .method-item:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }

        .method-item .method-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--accent-soft);
            line-height: 1;
            margin-bottom: 12px;
            display: block;
        }

        .method-item h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .method-item p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            background: var(--bg-secondary);
            padding: 72px 0;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }

        .cta-section-inner {
            max-width: 640px;
            margin: 0 auto;
        }

        .cta-section h2 {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            line-height: 1.9;
        }

        .cta-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .cta-form input[type="text"] {
            flex: 1;
            min-width: 240px;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-strong);
            background: var(--bg-card);
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: all var(--transition-fast);
        }

        .cta-form input[type="text"]::placeholder {
            color: var(--text-muted);
        }

        .cta-form input[type="text"]:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 2px var(--accent-glow);
        }

        .cta-form .btn-primary {
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .cta-form .btn-primary:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
        }

        .cta-form .btn-primary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* FAQ */
        .faq-section {
            background: var(--bg-primary);
            padding: 72px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
            background: var(--bg-card-hover);
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            user-select: none;
        }

        .faq-question i {
            color: var(--accent);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.9;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* Article List */
        .article-list-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .article-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
        }

        .article-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .article-card:hover img {
            transform: scale(1.03);
        }

        .article-card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .article-card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
            flex: 1;
        }

        .article-card-body .article-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-card-body .article-link:hover {
            color: var(--accent-strong);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-desc {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 300px;
        }

        .footer-col-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-link {
            display: block;
            font-size: 0.92rem;
            color: var(--text-secondary);
            padding: 6px 0;
            transition: all var(--transition-fast);
        }

        .footer-link:hover {
            color: var(--accent);
            transform: translateX(2px);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Buttons generic */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: #0B0D12;
            font-weight: 700;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .btn-primary:hover {
            background: var(--accent-strong);
            box-shadow: var(--shadow-glow);
        }

        .btn-primary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            background: transparent;
            color: var(--accent);
            font-weight: 700;
            font-size: 0.95rem;
            border: 1px solid var(--accent);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .btn-outline:hover {
            background: var(--accent-soft);
            box-shadow: var(--shadow-glow);
        }

        .btn-outline:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* Utility */
        .text-accent {
            color: var(--accent);
        }
        .text-secondary {
            color: var(--secondary);
        }
        .text-gold {
            color: var(--gold);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .metric-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .version-compare-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .method-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-list-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .nav-actions .nav-cta-btn {
                display: none;
            }
            .hero-banner-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
            }
            .hero-banner-inner h1 {
                font-size: 1.65rem;
                min-width: 0;
            }
            .hero-announcement-chips {
                justify-content: flex-start;
            }
            .section {
                padding: 48px 0;
            }
            .two-col-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .version-compare-grid {
                grid-template-columns: 1fr;
            }
            .method-list {
                grid-template-columns: 1fr;
            }
            .article-list-grid {
                grid-template-columns: 1fr;
            }
            .cta-form {
                flex-direction: column;
            }
            .cta-form input[type="text"] {
                width: 100%;
                min-width: 0;
            }
            .cta-form .btn-primary {
                width: 100%;
            }
            .trend-chart-placeholder img {
                height: 200px;
            }
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 14px;
            }
            .metric-card-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .hero-banner-inner h1 {
                font-size: 1.45rem;
            }
            .section-head h2 {
                font-size: 1.5rem;
            }
            .table-responsive {
                border-radius: var(--radius-sm);
            }
            .data-table th,
            .data-table td {
                padding: 10px 14px;
                font-size: 0.85rem;
            }
        }