/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0d0d1a;
            --primary-light: #1a1a2e;
            --primary-mid: #16213e;
            --accent: #ff6b35;
            --accent-hover: #ff8555;
            --accent-light: #ff8c5a;
            --gold: #ffd700;
            --gold-light: #ffe44d;
            --text: #ffffff;
            --text-muted: #a0a0b0;
            --text-dark: #6a6a7a;
            --bg-card: #1a1a2e;
            --bg-card-hover: #222240;
            --bg-section: #0f0f1f;
            --bg-section-alt: #12122a;
            --border: #2a2a4a;
            --border-light: #3a3a5a;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
            --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 40px rgba(255,107,53,0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container: 1200px;
            --header-h: 72px;
        }

        /* ===== Base Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            background: var(--primary);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Utility ===== */
        .text-accent { color: var(--accent); }
        .text-gold { color: var(--gold); }
        .text-muted { color: var(--text-muted); }
        .text-center { text-align: center; }
        .mb-12 { margin-bottom: 12px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-40 { margin-bottom: 40px; }
        .mt-40 { margin-top: 40px; }
        .section-pad { padding: 80px 0; }
        @media (max-width: 768px) { .section-pad { padding: 48px 0; } }

        /* ===== Section Title ===== */
        .section-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 48px;
        }
        @media (max-width: 768px) {
            .section-title { font-size: 26px; }
            .section-sub { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            line-height: 1.2;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            background: transparent;
            color: var(--text);
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            box-shadow: var(--shadow-glow);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(255,107,53,0.3);
            color: #fff;
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline {
            border-color: var(--border-light);
            color: var(--text);
            background: transparent;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(255,107,53,0.08);
            transform: translateY(-2px);
        }
        .btn-lg { padding: 18px 40px; font-size: 18px; border-radius: var(--radius-md); }
        .btn-sm { padding: 8px 18px; font-size: 14px; border-radius: 6px; }
        .btn .icon { font-size: 18px; }
        @media (max-width: 520px) {
            .btn { padding: 12px 24px; font-size: 15px; }
            .btn-lg { padding: 14px 28px; font-size: 16px; }
        }

        /* ===== Header & Navigation (Segmented Tab Style) ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(13,13,26,0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(42,42,74,0.5);
            height: var(--header-h);
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-logo {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .header-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 900;
        }
        .header-logo span { background: linear-gradient(135deg, #fff, var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

        /* Nav tabs */
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.05);
            padding: 4px;
            border-radius: var(--radius-xl);
            border: 1px solid var(--border);
        }
        .nav-tabs .nav-item {
            padding: 8px 22px;
            border-radius: 100px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            cursor: pointer;
            white-space: nowrap;
            background: transparent;
            border: none;
        }
        .nav-tabs .nav-item:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .nav-tabs .nav-item.active {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(255,107,53,0.3);
        }
        .nav-tabs .nav-item.active:hover { background: var(--accent-hover); }

        /* Header actions */
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .header-actions .btn { padding: 8px 20px; font-size: 14px; border-radius: 100px; }

        /* Mobile toggle */
        .mobile-toggle {
            display: none;
            background: transparent;
            color: #fff;
            font-size: 26px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            border: 1px solid var(--border);
        }
        .mobile-toggle:hover { background: rgba(255,255,255,0.05); }

        @media (max-width: 820px) {
            .nav-tabs { display: none; }
            .header-actions .btn { display: none; }
            .mobile-toggle { display: flex; align-items: center; justify-content: center; }
            .header-logo { font-size: 18px; }
            .header-logo .logo-icon { width: 30px; height: 30px; font-size: 14px; }

            /* Mobile drawer */
            .mobile-drawer {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(13,13,26,0.98);
                backdrop-filter: blur(20px);
                padding: 16px 24px 24px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                z-index: 999;
            }
            .mobile-drawer.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .mobile-drawer .nav-item {
                display: block;
                padding: 14px 16px;
                border-radius: var(--radius-sm);
                font-size: 17px;
                font-weight: 500;
                color: var(--text-muted);
                border-bottom: 1px solid rgba(42,42,74,0.3);
            }
            .mobile-drawer .nav-item:last-child { border-bottom: none; }
            .mobile-drawer .nav-item:hover { color: #fff; background: rgba(255,255,255,0.05); }
            .mobile-drawer .nav-item.active { color: var(--accent); background: rgba(255,107,53,0.1); }
            .mobile-drawer .btn { width: 100%; margin-top: 12px; justify-content: center; }
        }
        @media (max-width: 520px) {
            .header-logo { font-size: 16px; }
            .header-logo .logo-icon { width: 26px; height: 26px; font-size: 12px; }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 0 80px;
            overflow: hidden;
            background: var(--primary);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(13,13,26,0.30) 0%, rgba(13,13,26,0.85) 70%, var(--primary) 100%);
            z-index: 1;
        }
        .hero-overlay::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center 30%, rgba(255,107,53,0.08) 0%, transparent 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,107,53,0.15);
            border: 1px solid rgba(255,107,53,0.25);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 14px;
            color: var(--accent);
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 14px; }
        .hero-title {
            font-size: 64px;
            font-weight: 900;
            letter-spacing: -2px;
            line-height: 1.1;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 30%, var(--gold-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 20px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .hero-actions .btn { min-width: 160px; justify-content: center; }
        .hero-scroll {
            position: absolute;
            bottom: 32px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 2;
            color: var(--text-muted);
            font-size: 14px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            opacity: 0.6;
            animation: floatDown 2s ease-in-out infinite;
        }
        .hero-scroll i { font-size: 20px; }
        @keyframes floatDown { 0%,100%{transform:translateX(-50%) translateY(0);} 50%{transform:translateX(-50%) translateY(8px);} }

        @media (max-width: 1024px) {
            .hero-title { font-size: 48px; }
            .hero-desc { font-size: 18px; }
        }
        @media (max-width: 768px) {
            .hero { min-height: 92vh; padding: 100px 0 60px; }
            .hero-title { font-size: 36px; letter-spacing: -1px; }
            .hero-desc { font-size: 16px; }
            .hero-actions .btn { min-width: 140px; }
        }
        @media (max-width: 520px) {
            .hero-title { font-size: 28px; }
            .hero-desc { font-size: 15px; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; }
            .hero-badge { font-size: 12px; padding: 4px 14px; }
        }

        /* ===== Platform Intro ===== */
        .intro-section {
            background: var(--bg-section);
            position: relative;
            overflow: hidden;
        }
        .intro-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(255,107,53,0.05) 0%, transparent 70%);
            pointer-events: none;
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-image img { width: 100%; height: 420px; object-fit: cover; transition: var(--transition); }
        .intro-image:hover img { transform: scale(1.03); }
        .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255,107,53,0.1), transparent);
            pointer-events: none;
        }
        .intro-text h2 { font-size: 32px; margin-bottom: 20px; }
        .intro-text p { color: var(--text-muted); margin-bottom: 16px; font-size: 16px; line-height: 1.8; }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 24px;
        }
        .intro-features li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 15px;
            color: var(--text);
            padding: 8px 12px;
            background: rgba(255,255,255,0.04);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
        }
        .intro-features li i { color: var(--accent); font-size: 16px; width: 20px; }

        @media (max-width: 900px) {
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image img { height: 280px; }
            .intro-text h2 { font-size: 26px; }
            .intro-features { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 520px) {
            .intro-features { grid-template-columns: 1fr; }
            .intro-text h2 { font-size: 22px; }
        }

        /* ===== Category Entry ===== */
        .category-section {
            background: var(--bg-section-alt);
        }
        .category-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--gold));
            opacity: 0;
            transition: var(--transition);
        }
        .category-card:hover { background: var(--bg-card-hover); border-color: var(--border-light); transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .category-card:hover::before { opacity: 1; }
        .category-card .icon-wrap {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: rgba(255,107,53,0.12);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--accent);
            transition: var(--transition);
        }
        .category-card:hover .icon-wrap { background: rgba(255,107,53,0.2); transform: scale(1.05); }
        .category-card h3 { font-size: 20px; margin-bottom: 10px; }
        .category-card p { color: var(--text-muted); font-size: 15px; margin-bottom: 18px; }
        .category-card .btn { margin-top: 8px; }

        /* ===== News / CMS List ===== */
        .news-section {
            background: var(--bg-section);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover { background: var(--bg-card-hover); border-color: var(--border-light); transform: translateY(-3px); box-shadow: var(--shadow-md); }
        .news-card .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(255,107,53,0.15);
            color: var(--accent);
            margin-bottom: 12px;
            align-self: flex-start;
        }
        .news-card h3 { font-size: 18px; margin-bottom: 10px; line-height: 1.4; }
        .news-card h3 a { color: #fff; }
        .news-card h3 a:hover { color: var(--accent); }
        .news-card p { color: var(--text-muted); font-size: 14px; line-height: 1.6; flex: 1; margin-bottom: 16px; }
        .news-card .meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--text-dark);
            border-top: 1px solid var(--border);
            padding-top: 14px;
            margin-top: auto;
        }
        .news-card .meta .date { display: flex; align-items: center; gap: 4px; }
        .news-card .meta .more { color: var(--accent); font-weight: 500; }
        .news-card .meta .more:hover { color: var(--gold); }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            font-size: 16px;
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border);
        }

        /* ===== Process / Steps ===== */
        .process-section {
            background: var(--bg-section-alt);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            position: relative;
            transition: var(--transition);
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-light); }
        .step-card .step-num {
            width: 56px;
            height: 56px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            box-shadow: 0 4px 20px rgba(255,107,53,0.25);
        }
        .step-card h3 { font-size: 18px; margin-bottom: 10px; }
        .step-card p { color: var(--text-muted); font-size: 14px; line-height: 1.6; }
        .step-card .step-icon { font-size: 32px; color: var(--accent); margin-bottom: 16px; display: block; }

        /* ===== Stats ===== */
        .stats-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat fixed;
            opacity: 0.08;
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 32px;
            position: relative;
            z-index: 1;
        }
        .stat-item { text-align: center; padding: 24px 16px; }
        .stat-number {
            font-size: 48px;
            font-weight: 900;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .stat-label { font-size: 16px; color: var(--text-muted); }

        @media (max-width: 520px) {
            .stat-number { font-size: 36px; }
        }

        /* ===== Featured / Cover Cards ===== */
        .featured-section {
            background: var(--bg-section);
        }
        .featured-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .featured-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .featured-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border-light); }
        .featured-card .card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .featured-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
        .featured-card:hover .card-img img { transform: scale(1.06); }
        .featured-card .card-img .overlay-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            background: rgba(255,107,53,0.9);
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            color: #fff;
            backdrop-filter: blur(4px);
        }
        .featured-card .card-body { padding: 20px 20px 24px; }
        .featured-card .card-body h3 { font-size: 18px; margin-bottom: 8px; }
        .featured-card .card-body p { color: var(--text-muted); font-size: 14px; line-height: 1.6; margin-bottom: 12px; }
        .featured-card .card-body .meta-link { color: var(--accent); font-weight: 500; font-size: 14px; }
        .featured-card .card-body .meta-link:hover { color: var(--gold); }

        /* ===== Testimonials ===== */
        .testimonials-section {
            background: var(--bg-section-alt);
        }
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
        }
        .testimonial-card:hover { border-color: var(--border-light); box-shadow: var(--shadow-md); }
        .testimonial-card .stars { color: var(--gold); font-size: 16px; margin-bottom: 14px; letter-spacing: 2px; }
        .testimonial-card blockquote { color: var(--text-muted); font-size: 15px; line-height: 1.7; margin-bottom: 16px; font-style: italic; }
        .testimonial-card .author { display: flex; align-items: center; gap: 12px; }
        .testimonial-card .author .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: #fff;
        }
        .testimonial-card .author .name { font-weight: 600; font-size: 15px; }
        .testimonial-card .author .role { font-size: 13px; color: var(--text-dark); }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-section);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--border-light); }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            background: transparent;
            border: none;
            color: var(--text);
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question:hover { color: var(--accent); }
        .faq-question .icon { font-size: 18px; color: var(--accent); flex-shrink: 0; transition: var(--transition); }
        .faq-item.open .faq-question .icon { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-section-alt);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .cta-box {
            position: relative;
            z-index: 1;
            background: linear-gradient(135deg, rgba(255,107,53,0.08), rgba(255,215,0,0.05));
            border: 1px solid rgba(255,107,53,0.2);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            max-width: 860px;
            margin: 0 auto;
        }
        .cta-box h2 { font-size: 34px; margin-bottom: 16px; }
        .cta-box p { color: var(--text-muted); font-size: 18px; margin-bottom: 32px; max-width: 560px; margin-left: auto; margin-right: auto; }
        .cta-box .btn-group { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }

        @media (max-width: 768px) {
            .cta-box { padding: 40px 24px; }
            .cta-box h2 { font-size: 26px; }
            .cta-box p { font-size: 16px; }
        }
        @media (max-width: 520px) {
            .cta-box { padding: 32px 16px; }
            .cta-box h2 { font-size: 22px; }
            .cta-box .btn-group { flex-direction: column; width: 100%; }
            .cta-box .btn-group .btn { width: 100%; }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary);
            border-top: 1px solid var(--border);
            padding: 48px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .header-logo { margin-bottom: 16px; }
        .footer-brand p { color: var(--text-muted); font-size: 14px; line-height: 1.7; max-width: 320px; }
        .footer-col h4 { font-size: 16px; font-weight: 700; margin-bottom: 16px; color: #fff; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: var(--text-muted); font-size: 14px; }
        .footer-col ul li a:hover { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-dark);
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--accent); }

        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Back to top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            z-index: 100;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
        .back-top:hover { background: var(--accent-hover); transform: translateY(-4px); box-shadow: var(--shadow-glow); }

        @media (max-width: 520px) {
            .back-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 16px; }
        }

        /* ===== Responsive extras ===== */
        @media (max-width: 1024px) {
            .intro-grid { gap: 40px; }
            .stats-grid { gap: 20px; }
        }
        @media (max-width: 768px) {
            .section-pad { padding: 48px 0; }
            .news-grid { grid-template-columns: 1fr; }
            .featured-grid { grid-template-columns: 1fr 1fr; }
            .testimonials-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 520px) {
            .featured-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .category-cards { grid-template-columns: 1fr; }
            .hero-title { font-size: 28px; }
        }

/* roulang page: category1 */
/* ===== CSS Design Variables ===== */
        :root {
            --primary: #6c3cf0;
            --primary-dark: #5228c7;
            --primary-light: #8b5cf6;
            --primary-gradient: linear-gradient(135deg, #6c3cf0 0%, #a855f7 100%);
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --accent: #ec4899;
            --bg-dark: #0f0a1e;
            --bg-mid: #1a1230;
            --bg-light: #231b3e;
            --bg-card: #2a2048;
            --bg-surface: #312854;
            --text-white: #ffffff;
            --text-light: #e2d9f3;
            --text-muted: #a99bcb;
            --text-dim: #7b6aa0;
            --border-color: #3d2f63;
            --border-light: #4d3d7a;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(108, 60, 240, 0.15);
            --shadow-md: 0 8px 30px rgba(108, 60, 240, 0.2);
            --shadow-lg: 0 16px 60px rgba(108, 60, 240, 0.25);
            --shadow-glow: 0 0 40px rgba(108, 60, 240, 0.3);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --spacing-section: 80px;
        }

        /* ===== Base Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-light);
            background: var(--bg-dark);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--secondary); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-white); }
        h1 { font-size: 2.8rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.4rem; }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 1rem; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation (Tab Style) ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(15, 10, 30, 0.92);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(108, 60, 240, 0.15);
            padding: 0 24px;
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
        }
        .header-logo:hover { color: var(--primary-light); }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary-gradient);
            border-radius: 10px;
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            box-shadow: 0 4px 15px rgba(108, 60, 240, 0.4);
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(42, 32, 72, 0.6);
            padding: 4px;
            border-radius: 14px;
            border: 1px solid rgba(108, 60, 240, 0.15);
        }
        .nav-item {
            padding: 8px 22px;
            border-radius: 10px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-muted);
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-item:hover { color: var(--text-light); background: rgba(108, 60, 240, 0.08); }
        .nav-item.active {
            color: #fff;
            background: var(--primary-gradient);
            box-shadow: 0 4px 20px rgba(108, 60, 240, 0.35);
        }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 12px;
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: 0 4px 20px rgba(108, 60, 240, 0.3);
            transition: var(--transition);
        }
        .header-cta:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(108, 60, 240, 0.4); }
        .mobile-toggle { display: none; font-size: 1.5rem; color: var(--text-white); padding: 4px; }

        /* ===== Hero Banner (Category) ===== */
        .hero-banner {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 24px 60px;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            overflow: hidden;
        }
        .hero-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,10,30,0.85) 0%, rgba(26,18,48,0.7) 50%, rgba(108,60,240,0.25) 100%);
            z-index: 1;
        }
        .hero-banner::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(108,60,240,0.15) 0%, transparent 70%);
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            background: rgba(108, 60, 240, 0.2);
            border: 1px solid rgba(108, 60, 240, 0.3);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary-light);
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero-banner h1 {
            font-size: 3.2rem;
            font-weight: 900;
            letter-spacing: -1px;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 30%, #c4b5fd 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-banner p {
            font-size: 1.15rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto 28px;
            opacity: 0.9;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 14px;
            font-weight: 700;
            font-size: 1.05rem;
            box-shadow: 0 8px 30px rgba(108, 60, 240, 0.35);
            transition: var(--transition);
        }
        .btn-primary:hover { color: #fff; transform: translateY(-3px); box-shadow: 0 12px 40px rgba(108, 60, 240, 0.45); }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: rgba(255,255,255,0.06);
            color: var(--text-light);
            border: 1px solid rgba(108, 60, 240, 0.25);
            border-radius: 14px;
            font-weight: 600;
            font-size: 1.05rem;
            backdrop-filter: blur(4px);
            transition: var(--transition);
        }
        .btn-secondary:hover { color: #fff; background: rgba(108, 60, 240, 0.2); border-color: var(--primary-light); }

        /* ===== Section Common ===== */
        .section { padding: var(--spacing-section) 0; }
        .section-alt { background: var(--bg-mid); }
        .section-dark { background: var(--bg-dark); }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
        }
        .section-title h2 {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .section-title p {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 12px auto 0;
        }
        .title-accent {
            display: inline-block;
            width: 48px;
            height: 4px;
            background: var(--primary-gradient);
            border-radius: 4px;
            margin: 8px auto 0;
        }

        /* ===== Guide Steps ===== */
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 48px;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .step-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--primary-gradient);
            opacity: 0;
            transition: var(--transition);
        }
        .step-card:hover { transform: translateY(-6px); border-color: var(--border-light); box-shadow: var(--shadow-lg); }
        .step-card:hover::before { opacity: 1; }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            background: var(--primary-gradient);
            border-radius: 14px;
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 18px;
            box-shadow: 0 4px 20px rgba(108, 60, 240, 0.3);
        }
        .step-card h3 { font-size: 1.3rem; margin-bottom: 12px; }
        .step-card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 0; }

        /* ===== Login Methods (Cards with cover) ===== */
        .method-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 48px;
        }
        .method-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .method-card:hover { transform: translateY(-6px); border-color: var(--border-light); box-shadow: var(--shadow-lg); }
        .method-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .method-card .card-body {
            padding: 24px 22px 28px;
        }
        .method-card .card-body h3 { font-size: 1.2rem; margin-bottom: 8px; }
        .method-card .card-body p { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 16px; }
        .method-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(108, 60, 240, 0.15);
            border: 1px solid rgba(108, 60, 240, 0.2);
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary-light);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 48px auto 0;
            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: var(--transition);
        }
        .faq-item:hover { border-color: var(--border-light); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-light);
            cursor: pointer;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question:hover { color: var(--text-white); }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--primary-light);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            border-top: 0 solid var(--border-color);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
            border-top-width: 1px;
        }
        .faq-answer p { margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 72px 24px;
            text-align: center;
            border-radius: var(--radius-lg);
            margin: 40px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
        }
        .cta-section h2 { font-size: 2.2rem; color: #fff; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.85); font-size: 1.1rem; margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto; }
        .cta-section .btn-primary { background: #fff; color: var(--primary-dark); box-shadow: 0 8px 30px rgba(0,0,0,0.15); }
        .cta-section .btn-primary:hover { color: var(--primary-dark); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,0.2); }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p { color: var(--text-muted); font-size: 0.92rem; margin-top: 12px; max-width: 360px; }
        .footer-col h4 { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: var(--text-muted); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            color: var(--text-dim);
            font-size: 0.85rem;
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--primary-light); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root { --spacing-section: 60px; }
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .hero-banner h1 { font-size: 2.6rem; }
            .guide-steps, .method-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .header-inner { height: 60px; }
            .nav-tabs { gap: 2px; padding: 3px; }
            .nav-item { padding: 6px 14px; font-size: 0.85rem; }
            .header-cta { display: none; }
            .mobile-toggle { display: block; }
            .hero-banner { min-height: 320px; padding: 60px 20px 40px; }
            .hero-banner h1 { font-size: 2rem; }
            .hero-banner p { font-size: 1rem; }
            .guide-steps, .method-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .section-title h2 { font-size: 1.8rem; }
            .cta-section h2 { font-size: 1.7rem; }
            .cta-section { padding: 48px 20px; }
        }
        @media (max-width: 520px) {
            .header-inner { height: 56px; }
            .nav-item { padding: 5px 10px; font-size: 0.78rem; }
            .logo-icon { width: 32px; height: 32px; font-size: 1rem; }
            .header-logo { font-size: 1.15rem; gap: 6px; }
            .hero-banner h1 { font-size: 1.6rem; }
            .hero-banner p { font-size: 0.92rem; }
            .btn-primary, .btn-secondary { padding: 12px 24px; font-size: 0.9rem; }
            .step-card { padding: 28px 20px; }
            .method-card .card-img { height: 140px; }
            .faq-question { padding: 14px 18px; font-size: 0.92rem; }
            .cta-section h2 { font-size: 1.4rem; }
            .cta-section p { font-size: 0.95rem; }
        }

        /* ===== Mobile Nav Drawer ===== */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(15,10,30,0.98);
            backdrop-filter: blur(20px);
            z-index: 2000;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 20px;
            padding: 40px;
        }
        .mobile-drawer.open { display: flex; }
        .mobile-drawer .nav-item { font-size: 1.4rem; padding: 12px 30px; }
        .mobile-drawer .close-btn {
            position: absolute;
            top: 20px;
            right: 24px;
            font-size: 2rem;
            color: var(--text-white);
        }
        @media (max-width: 768px) {
            .mobile-drawer { display: none; }
            .mobile-drawer.open { display: flex; }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-soft: #eff6ff;
            --secondary: #0f172a;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-light: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08), 0 2px 8px rgba(15, 23, 42, 0.04);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12), 0 4px 16px rgba(15, 23, 42, 0.06);
            --shadow-xl: 0 24px 60px rgba(15, 23, 42, 0.16);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.6;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-subtitle {
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            line-height: 1.4;
            transition: all var(--transition);
            border: 2px solid transparent;
            justify-content: center;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.2);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 17px;
            border-radius: var(--radius-md);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: 6px;
        }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            background: var(--primary-soft);
            color: var(--primary);
            letter-spacing: 0.01em;
        }
        .badge-accent {
            background: #fef3c7;
            color: #b45309;
        }
        .badge-green {
            background: #ecfdf5;
            color: #059669;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
            background: rgba(255, 255, 255, 0.98);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--secondary);
            letter-spacing: -0.03em;
            flex-shrink: 0;
        }
        .header-logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 700;
        }
        .header-logo:hover {
            color: var(--secondary);
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 4px;
            background: var(--bg-alt);
            padding: 4px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
        }
        .nav-tabs .nav-item {
            padding: 8px 20px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-tabs .nav-item:hover {
            color: var(--text-primary);
            background: rgba(37, 99, 235, 0.06);
        }
        .nav-tabs .nav-item.active {
            background: var(--bg-card);
            color: var(--primary);
            box-shadow: var(--shadow-sm);
            font-weight: 600;
        }
        .nav-tabs .nav-item.active:hover {
            color: var(--primary);
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .header-cta .btn {
            padding: 8px 20px;
            font-size: 14px;
        }
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        @media (max-width: 768px) {
            .nav-tabs {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px;
                gap: 6px;
                border-radius: 0;
                border: none;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
                z-index: 999;
            }
            .nav-tabs.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-tabs .nav-item {
                width: 100%;
                text-align: center;
                padding: 12px 20px;
                font-size: 16px;
                border-radius: 10px;
            }
            .mobile-toggle {
                display: flex;
            }
            .header-cta .btn {
                padding: 6px 14px;
                font-size: 13px;
            }
            .header-logo {
                font-size: 18px;
            }
            .header-logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
        }
        @media (max-width: 480px) {
            .header-cta .btn span {
                display: none;
            }
            .header-cta .btn i {
                margin: 0;
            }
            .header-cta .btn {
                padding: 8px 12px;
            }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            padding-top: calc(var(--header-h) + 40px);
            padding-bottom: 60px;
            background: var(--bg-alt);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .page-banner-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
            width: 100%;
        }
        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .page-banner .breadcrumb a {
            color: var(--text-secondary);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--primary);
        }
        .page-banner .breadcrumb .sep {
            color: var(--text-light);
        }
        .page-banner .breadcrumb .current {
            color: var(--primary);
            font-weight: 500;
        }
        .page-banner h1 {
            font-size: 38px;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            max-width: 800px;
            margin-bottom: 12px;
        }
        .page-banner .meta {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 14px;
            color: var(--text-light);
            flex-wrap: wrap;
        }
        .page-banner .meta .category {
            background: var(--primary-soft);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 50px;
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .page-banner {
                padding-top: calc(var(--header-h) + 24px);
                padding-bottom: 40px;
                min-height: 200px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .page-banner .meta {
                gap: 12px;
                font-size: 13px;
            }
        }
        @media (max-width: 480px) {
            .page-banner h1 {
                font-size: 22px;
            }
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-main {
            min-width: 0;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-body .content {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-body .content p {
            margin-bottom: 1.2em;
        }
        .article-body .content h2 {
            font-size: 24px;
            font-weight: 700;
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            letter-spacing: -0.01em;
        }
        .article-body .content h3 {
            font-size: 19px;
            font-weight: 600;
            margin-top: 1.4em;
            margin-bottom: 0.5em;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.2em;
            padding-left: 1.5em;
        }
        .article-body .content ul li {
            list-style: disc;
            margin-bottom: 0.3em;
        }
        .article-body .content ol li {
            list-style: decimal;
            margin-bottom: 0.3em;
        }
        .article-body .content img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-soft);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.2em 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body .content a:hover {
            color: var(--primary-dark);
        }
        .article-body .content .code-inline {
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.9em;
        }
        .article-notfound {
            text-align: center;
            padding: 80px 20px;
        }
        .article-notfound .icon {
            font-size: 64px;
            color: var(--text-light);
            margin-bottom: 24px;
        }
        .article-notfound h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .article-notfound p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 17px;
        }
        .article-notfound .btn {
            display: inline-flex;
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-soft);
        }
        .sidebar-card ul li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .sidebar-card ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .sidebar-card ul li a i {
            width: 20px;
            color: var(--primary-light);
            font-size: 13px;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            border: none;
            padding: 32px 28px;
            text-align: center;
        }
        .sidebar-cta h3 {
            color: #fff;
            border-bottom-color: rgba(255, 255, 255, 0.2);
        }
        .sidebar-cta p {
            font-size: 14px;
            opacity: 0.9;
            margin-bottom: 20px;
            line-height: 1.6;
        }
        .sidebar-cta .btn {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
            width: 100%;
        }
        .sidebar-cta .btn:hover {
            background: rgba(255, 255, 255, 0.9);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                order: 2;
            }
            .article-main {
                order: 1;
            }
        }
        @media (max-width: 768px) {
            .article-section {
                padding: 40px 0;
            }
            .article-body {
                padding: 24px;
            }
            .article-body .content {
                font-size: 15px;
            }
            .article-body .content h2 {
                font-size: 20px;
            }
            .sidebar-card {
                padding: 20px;
            }
        }
        @media (max-width: 480px) {
            .article-body {
                padding: 16px;
                border-radius: var(--radius-md);
            }
            .article-body .content {
                font-size: 14px;
            }
        }

        /* ===== Related / CTA ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-alt);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--bg-alt);
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-body .badge {
            margin-bottom: 8px;
        }
        .related-card .card-body h4 {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .card-body .meta {
            font-size: 13px;
            color: var(--text-light);
        }
        @media (max-width: 768px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 480px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-card .card-img {
                height: 160px;
            }
        }

        .cta-section {
            padding: 80px 0;
            background: var(--bg-dark);
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 540px;
            margin: 0 auto 32px;
            line-height: 1.6;
        }
        .cta-section .btn {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--secondary);
            font-weight: 700;
        }
        .cta-section .btn:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: var(--secondary);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(245, 158, 11, 0.35);
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 60px 0;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section p {
                font-size: 15px;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .header-logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .header-logo .logo-icon {
            background: var(--primary-light);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer {
                padding: 40px 0 0;
            }
        }

        /* ===== Scroll Top ===== */
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 99;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            opacity: 0;
            transform: translateY(20px);
            transition: all var(--transition);
            pointer-events: none;
            border: none;
            cursor: pointer;
        }
        .scroll-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: all;
        }
        .scroll-top:hover {
            background: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        @media (max-width: 480px) {
            .scroll-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 16px;
            }
        }