/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --secondary-light: #fbbf24;
            --accent: #8b5cf6;
            --accent-light: #a78bfa;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-weak: #64748b;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
            --transition: 0.25s ease;
            --max-width: 1200px;
            --header-h: 72px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button { font-family: inherit; cursor: pointer; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 0.75rem; color: var(--text-weak); }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding { padding: 80px 0; }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            color: var(--primary);
            background: var(--primary-bg);
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            color: var(--text);
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-weak);
            max-width: 640px;
            margin: 0 auto 48px auto;
            text-align: center;
        }
        .text-center { text-align: center; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37,99,235,0.35);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(37,99,235,0.25); }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37,99,235,0.25);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-secondary {
            background: var(--secondary);
            color: var(--text-white);
            border-color: var(--secondary);
        }
        .btn-secondary:hover {
            background: var(--secondary-dark);
            border-color: var(--secondary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.35);
        }
        .btn-lg { padding: 16px 40px; font-size: 1.125rem; border-radius: var(--radius); }
        .btn-sm { padding: 8px 18px; font-size: 0.875rem; }
        .btn:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled { background: rgba(255,255,255,0.98); box-shadow: var(--shadow-sm); }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-list a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-weak);
            padding: 4px 0;
            position: relative;
            transition: color var(--transition);
        }
        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width var(--transition);
        }
        .nav-list a:hover { color: var(--text); }
        .nav-list a:hover::after { width: 100%; }
        .nav-list a.active { color: var(--primary); }
        .nav-list a.active::after { width: 100%; }
        .nav-cta .btn { padding: 10px 24px; font-size: 0.9rem; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero ===== */
        .hero {
            padding-top: calc(var(--header-h) + 20px);
            min-height: 92vh;
            display: flex;
            align-items: center;
            position: relative;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.75) 0%, rgba(37,99,235,0.55) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; width: 100%; }
        .hero-content { max-width: 720px; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(6px);
            color: #fff;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .hero-badge i { color: var(--secondary-light); }
        .hero h1 {
            font-size: 3.25rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--secondary-light), #fff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.85);
            max-width: 580px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }
        .hero-actions .btn { font-size: 1.05rem; padding: 14px 36px; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.2);
        }
        .hero-stat h3 { font-size: 1.75rem; color: #fff; font-weight: 700; }
        .hero-stat p { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin: 0; }

        /* ===== Features / Intro ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-top: 16px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--primary-bg);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 18px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
        }
        .feature-icon.blue { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
        .feature-icon.amber { background: linear-gradient(135deg, var(--secondary), var(--secondary-light)); }
        .feature-icon.purple { background: linear-gradient(135deg, var(--accent), var(--accent-light)); }
        .feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
        .feature-card p { font-size: 0.95rem; margin: 0; }

        /* ===== Categories ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .category-card {
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            cursor: pointer;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .card-img {
            height: 200px;
            background: var(--bg-alt);
            position: relative;
            overflow: hidden;
        }
        .category-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .category-card:hover .card-img img { transform: scale(1.05); }
        .category-card .card-img .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(15,23,42,0.5) 0%, transparent 60%);
        }
        .category-card .card-body { padding: 20px 24px 24px; }
        .category-card .card-body h3 { font-size: 1.15rem; margin-bottom: 6px; }
        .category-card .card-body p { font-size: 0.9rem; margin: 0; }
        .category-card .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-bg);
            padding: 2px 12px;
            border-radius: 12px;
            margin-bottom: 10px;
        }

        /* ===== Latest Posts (CMS) ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .post-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .post-card:hover {
            box-shadow: var(--shadow);
            border-color: var(--primary-bg);
            transform: translateY(-2px);
        }
        .post-card .post-thumb {
            width: 160px;
            min-height: 120px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg-alt);
        }
        .post-card .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .post-card .post-info { flex: 1; display: flex; flex-direction: column; justify-content: center; }
        .post-card .post-cat {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-bg);
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            margin-bottom: 8px;
            align-self: flex-start;
        }
        .post-card h3 { font-size: 1.05rem; margin-bottom: 6px; font-weight: 600; }
        .post-card h3 a { color: var(--text); transition: color var(--transition); }
        .post-card h3 a:hover { color: var(--primary); }
        .post-card p { font-size: 0.9rem; margin: 0 0 8px; color: var(--text-weak); }
        .post-card .post-meta {
            font-size: 0.8rem;
            color: var(--text-weak);
            display: flex;
            gap: 16px;
            align-items: center;
        }
        .post-card .post-meta i { margin-right: 4px; }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-weak);
            background: var(--bg-alt);
            border-radius: var(--radius);
            font-size: 1.05rem;
        }

        /* ===== Advantages / Stats ===== */
        .advantages {
            background: var(--bg-alt);
        }
        .adv-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .adv-item {
            text-align: center;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .adv-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
        .adv-item .adv-number {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .adv-item h4 { font-size: 1rem; margin: 10px 0 4px; }
        .adv-item p { font-size: 0.85rem; margin: 0; }

        /* ===== Steps / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
            z-index: 0;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg);
            padding: 0 12px;
        }
        .step-circle {
            width: 80px;
            height: 80px;
            margin: 0 auto 18px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            box-shadow: 0 8px 24px rgba(37,99,235,0.3);
        }
        .step-item:nth-child(2) .step-circle { background: linear-gradient(135deg, var(--secondary), var(--secondary-light)); box-shadow: 0 8px 24px rgba(245,158,11,0.3); }
        .step-item:nth-child(3) .step-circle { background: linear-gradient(135deg, var(--accent), var(--accent-light)); box-shadow: 0 8px 24px rgba(139,92,246,0.3); }
        .step-item:nth-child(4) .step-circle { background: linear-gradient(135deg, #10b981, #34d399); box-shadow: 0 8px 24px rgba(16,185,129,0.3); }
        .step-item h4 { font-size: 1.05rem; margin-bottom: 6px; }
        .step-item p { font-size: 0.9rem; margin: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            margin-bottom: 12px;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            user-select: none;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text);
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--bg-alt); }
        .faq-question i { color: var(--primary); transition: transform var(--transition); font-size: 0.85rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { color: #fff; font-size: 2.25rem; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.85); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-section .btn { background: #fff; color: var(--primary); border-color: #fff; }
        .cta-section .btn:hover { background: var(--secondary); color: #fff; border-color: var(--secondary); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,0.2); }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 56px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { color: #fff; margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 18px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { font-size: 0.9rem; color: rgba(255,255,255,0.6); transition: color var(--transition); }
        .footer-col ul li a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .categories-grid { grid-template-columns: repeat(2, 1fr); }
            .adv-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid::before { display: none; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .hero h1 { font-size: 2.75rem; }
        }
        @media (max-width: 768px) {
            .nav-list { display: none; }
            .nav-toggle { display: flex; }
            .nav-list.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                padding: 20px 24px 28px;
                gap: 16px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
            }
            .nav-list.open a { font-size: 1.05rem; padding: 8px 0; }
            .nav-cta { margin-left: 0; }
            .hero { min-height: 80vh; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 20px; flex-wrap: wrap; }
            .hero-stat h3 { font-size: 1.4rem; }
            .features-grid { grid-template-columns: 1fr; }
            .categories-grid { grid-template-columns: 1fr; }
            .posts-grid { grid-template-columns: 1fr; }
            .post-card { flex-direction: column; }
            .post-card .post-thumb { width: 100%; height: 180px; }
            .adv-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
            .step-item { padding: 0; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .section-padding { padding: 56px 0; }
            .section-title { font-size: 1.6rem; }
            .section-subtitle { font-size: 1rem; margin-bottom: 32px; }
            .cta-section h2 { font-size: 1.7rem; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.8rem; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .adv-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .container { padding: 0 16px; }
            .post-card .post-thumb { height: 140px; }
            .feature-card { padding: 24px 18px; }
            .category-card .card-body { padding: 16px 18px 20px; }
        }

        /* ===== Focus visible ===== */
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }

        /* ===== Smooth reveal animation ===== */
        .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .reveal.visible { opacity: 1; transform: translateY(0); }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #6c5ce7;
            --primary-dark: #5a4bd1;
            --primary-light: #a29bfe;
            --secondary: #fd79a8;
            --secondary-light: #fab1c8;
            --accent: #00cec9;
            --bg-body: #f8f9fe;
            --bg-white: #ffffff;
            --bg-light: #f0f2ff;
            --bg-dark: #2d2366;
            --text-dark: #1a1a2e;
            --text-main: #2d3436;
            --text-muted: #636e72;
            --text-light: #b2bec3;
            --text-white: #ffffff;
            --border-color: #e8e8f0;
            --border-light: #f0f0f8;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.08);
            --shadow-md: 0 8px 28px rgba(108, 92, 231, 0.12);
            --shadow-lg: 0 18px 48px rgba(108, 92, 231, 0.18);
            --shadow-hover: 0 14px 40px rgba(108, 92, 231, 0.22);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
            --spacing-section: 80px;
            --spacing-block: 56px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-body);
        }

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

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

        a:hover {
            color: var(--primary-dark);
        }

        ul,
        ol {
            list-style: none;
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

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

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            :root {
                --spacing-section: 48px;
                --spacing-block: 32px;
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 20px rgba(108, 92, 231, 0.06);
            transition: var(--transition);
        }

        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            transition: var(--transition);
        }

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

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 20px;
            font-weight: 800;
            flex-shrink: 0;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-list a {
            position: relative;
            padding: 8px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-list a:hover {
            color: var(--primary);
            background: var(--bg-light);
        }

        .nav-list a.active {
            color: var(--primary);
            background: rgba(108, 92, 231, 0.10);
            font-weight: 600;
        }

        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }

        .nav-list .nav-cta {
            padding: 0;
            margin-left: 12px;
            background: none !important;
        }

        .nav-list .nav-cta .btn {
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 4px;
            transition: var(--transition);
        }

        .nav-toggle:hover span {
            background: var(--primary);
        }

        @media (max-width: 768px) {
            .nav-list {
                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: 20px 24px 28px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 18px;
                font-size: 16px;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.active {
                background: rgba(108, 92, 231, 0.10);
                border-left: 4px solid var(--primary);
            }
            .nav-list .nav-cta {
                margin-left: 0;
                margin-top: 10px;
                width: 100%;
            }
            .nav-list .nav-cta .btn {
                width: 100%;
                text-align: center;
                padding: 14px 24px;
            }
            .nav-toggle {
                display: flex;
            }
        }

        @media (max-width: 480px) {
            .header-inner {
                padding: 0 12px;
            }
            .logo {
                font-size: 18px;
                gap: 8px;
            }
            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 16px;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 600;
            line-height: 1.4;
            border-radius: var(--radius-md);
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border-color: transparent;
            box-shadow: 0 4px 14px rgba(108, 92, 231, 0.30);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(108, 92, 231, 0.40);
            color: #fff;
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(108, 92, 231, 0.25);
        }

        .btn-secondary {
            background: var(--bg-white);
            color: var(--primary);
            border-color: var(--border-color);
        }

        .btn-secondary:hover {
            background: var(--bg-light);
            border-color: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.5);
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 10px 20px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 18px 44px;
            font-size: 18px;
            border-radius: var(--radius-lg);
        }

        .btn:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        /* ===== Section ===== */
        .section {
            padding: var(--spacing-section) 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: var(--spacing-block);
        }

        .section-header .subtitle {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(108, 92, 231, 0.10);
            padding: 6px 20px;
            border-radius: 50px;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        .section-header h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-dark);
            line-height: 1.25;
            margin-bottom: 16px;
        }

        .section-header p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .section-header h2 {
                font-size: 26px;
            }
            .section-header p {
                font-size: 16px;
            }
        }

        @media (max-width: 480px) {
            .section-header h2 {
                font-size: 22px;
            }
        }

        /* ===== Hero / Banner ===== */
        .page-banner {
            margin-top: var(--header-h);
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #3d2e7c 60%, #5a4bd1 100%);
            position: relative;
            overflow: hidden;
            min-height: 380px;
            display: flex;
            align-items: center;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(253, 121, 168, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .page-banner .breadcrumb {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
        }

        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }

        .page-banner .breadcrumb a:hover {
            color: #fff;
        }

        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.9);
        }

        .page-banner h1 {
            font-size: 44px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }

        .page-banner p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .page-banner .banner-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            .page-banner {
                padding: 80px 0 56px;
                min-height: 300px;
            }
            .page-banner h1 {
                font-size: 30px;
            }
            .page-banner p {
                font-size: 16px;
            }
        }

        @media (max-width: 480px) {
            .page-banner {
                padding: 72px 0 40px;
                min-height: 260px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .page-banner .banner-actions .btn {
                width: 100%;
            }
        }

        /* ===== Features / 平台特色 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }

        .feature-card .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, rgba(108, 92, 231, 0.12), rgba(253, 121, 168, 0.12));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--primary);
            transition: var(--transition);
        }

        .feature-card:hover .icon {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            transform: scale(1.05);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.6;
        }

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

        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .feature-card {
                padding: 28px 20px;
            }
        }

        /* ===== Game Cards Grid ===== */
        .game-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .game-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .game-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
        }

        .game-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--bg-light);
            transition: var(--transition);
        }

        .game-card:hover .card-img {
            transform: scale(1.02);
        }

        .game-card .card-body {
            padding: 24px 22px 26px;
        }

        .game-card .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }

        .game-card .card-body .tags {
            display: flex;
            gap: 8px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .game-card .card-body .tags span {
            font-size: 12px;
            font-weight: 500;
            color: var(--primary);
            background: rgba(108, 92, 231, 0.08);
            padding: 3px 12px;
            border-radius: 50px;
        }

        .game-card .card-body p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .game-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 14px;
            color: var(--text-light);
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
        }

        .game-card .card-body .card-meta .rating {
            color: #f39c12;
        }

        .game-card .card-body .btn {
            margin-top: 4px;
        }

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

        @media (max-width: 520px) {
            .game-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .game-card .card-img {
                height: 180px;
            }
            .game-card .card-body {
                padding: 18px 16px 20px;
            }
        }

        /* ===== Category Tags ===== */
        .category-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-bottom: 40px;
        }

        .category-tags .tag {
            padding: 10px 26px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 50px;
            transition: var(--transition);
            cursor: default;
        }

        .category-tags .tag.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 14px rgba(108, 92, 231, 0.25);
        }

        .category-tags .tag:hover:not(.active) {
            border-color: var(--primary-light);
            background: var(--bg-light);
            transform: translateY(-2px);
        }

        /* ===== Stats / 数据统计 ===== */
        .stats-section {
            background: linear-gradient(135deg, var(--bg-dark) 0%, #3d2e7c 100%);
            padding: var(--spacing-section) 0;
            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;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 2;
        }

        .stat-item {
            text-align: center;
            color: var(--text-white);
            padding: 20px 12px;
        }

        .stat-item .number {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, #fff, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .stat-item .label {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .stat-item .number {
                font-size: 36px;
            }
        }

        @media (max-width: 480px) {
            .stat-item .number {
                font-size: 30px;
            }
        }

        /* ===== Steps / 下载流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            counter-reset: step;
        }

        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 40px 32px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: var(--transition);
            counter-increment: step;
        }

        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .step-card .step-number {
            width: 52px;
            height: 52px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 800;
            box-shadow: 0 6px 20px rgba(108, 92, 231, 0.25);
        }

        .step-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .step-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .step-card {
                padding: 28px 20px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }

        .faq-question {
            width: 100%;
            padding: 20px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-dark);
            background: none;
            text-align: left;
            cursor: pointer;
            transition: var(--transition);
        }

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

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

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 28px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 28px 24px;
        }

        .faq-answer p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .faq-question {
                padding: 16px 20px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 20px;
            }
            .faq-item.open .faq-answer {
                padding: 0 20px 18px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-dark) 0%, #4a3a8a 60%, var(--primary) 100%);
            padding: var(--spacing-section) 0;
            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;
            mix-blend-mode: overlay;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 32px;
        }

        .cta-section .btn {
            font-size: 18px;
            padding: 16px 48px;
            background: #fff;
            color: var(--primary);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
        }

        .cta-section .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
            color: var(--primary-dark);
        }

        @media (max-width: 768px) {
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section p {
                font-size: 16px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--text-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 64px 0 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .site-footer .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }

        .site-footer .footer-brand .logo .logo-icon {
            background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
            color: var(--text-dark);
        }

        .site-footer .footer-brand p {
            font-size: 15px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 300px;
        }

        .site-footer .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
        }

        .site-footer .footer-col ul li {
            margin-bottom: 12px;
        }

        .site-footer .footer-col ul li a {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }

        .site-footer .footer-col ul li a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }

        .site-footer .footer-bottom {
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.4);
        }

        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }

        .site-footer .footer-bottom a:hover {
            color: var(--primary-light);
        }

        @media (max-width: 1024px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 520px) {
            .site-footer {
                padding: 40px 0 0;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
        }

        /* ===== Background Variants ===== */
        .bg-light {
            background: var(--bg-light);
        }

        .bg-white {
            background: var(--bg-white);
        }

        /* ===== Responsive Extra ===== */
        @media (max-width: 1024px) {
            .game-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        @media (max-width: 520px) {
            .game-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== Focus visible ===== */
        :focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        /* ===== Smooth anchor offset ===== */
        .anchor-offset {
            scroll-margin-top: calc(var(--header-h) + 20px);
        }

        /* ===== Divider ===== */
        .section-divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 0 auto 20px;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #6C5CE7;
            --primary-dark: #5A4BD1;
            --primary-light: #A29BFE;
            --primary-bg: rgba(108, 92, 231, 0.08);
            --secondary: #FD79A8;
            --secondary-light: #FDCB6E;
            --accent: #00CEC9;
            --bg: #F8F9FE;
            --bg-card: #FFFFFF;
            --bg-dark: #2D3436;
            --text: #2D3436;
            --text-light: #636E72;
            --text-muted: #B2BEC3;
            --border: #E8ECF4;
            --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.06);
            --shadow-md: 0 8px 30px rgba(108, 92, 231, 0.10);
            --shadow-lg: 0 20px 60px rgba(108, 92, 231, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --spacing-section: 80px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        h1 {
            font-size: 2.4rem;
        }
        h2 {
            font-size: 1.8rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.15rem;
        }
        p {
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-xs);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }
        .nav-cta {
            margin-left: 12px;
        }
        .nav-cta .btn {
            padding: 8px 22px;
            font-size: 0.9rem;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px;
            border-radius: var(--radius-xs);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-bg);
        }
        .nav-toggle span {
            width: 28px;
            height: 3px;
            background: var(--text);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 6px);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -6px);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-align: center;
            justify-content: center;
            line-height: 1.2;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 6px 20px rgba(108, 92, 231, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(108, 92, 231, 0.45);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-secondary {
            background: var(--bg-card);
            color: var(--primary);
            border: 2px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: var(--primary-bg);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 42px;
            font-size: 1.1rem;
        }
        .btn i {
            font-size: 1.1em;
        }

        /* ===== Article Detail Page ===== */
        .page-article {
            padding-top: calc(var(--header-h) + 20px);
            padding-bottom: var(--spacing-section);
        }

        /* Article Banner */
        .article-banner {
            position: relative;
            background: linear-gradient(135deg, var(--primary), #2D3436);
            padding: 80px 0 60px;
            margin-bottom: 50px;
            overflow: hidden;
            border-bottom: 4px solid var(--secondary-light);
        }
        .article-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .article-banner .container {
            position: relative;
            z-index: 1;
        }
        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            transition: color var(--transition);
        }
        .article-banner .breadcrumb a:hover {
            color: #fff;
        }
        .article-banner .breadcrumb i {
            font-size: 0.7rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .article-banner .post-category {
            display: inline-block;
            background: var(--secondary-light);
            color: var(--text);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            color: #fff;
            font-size: 2.6rem;
            max-width: 900px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
            line-height: 1.25;
        }
        .article-banner .post-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-top: 20px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.9rem;
            flex-wrap: wrap;
        }
        .article-banner .post-meta i {
            margin-right: 6px;
            opacity: 0.7;
        }
        .article-banner .post-meta span {
            display: flex;
            align-items: center;
        }

        /* Article Content */
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-main {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            padding: 40px 44px;
            border: 1px solid var(--border);
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 1.6rem;
            border-left: 4px solid var(--primary);
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 1.3rem;
        }
        .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.2rem;
            padding-left: 1.5rem;
        }
        .article-body ul {
            list-style: disc;
        }
        .article-body ol {
            list-style: decimal;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body img {
            border-radius: var(--radius-sm);
            margin: 1.5rem 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-body .highlight-box {
            background: var(--primary-bg);
            border: 1px solid var(--primary-light);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            margin: 1.5rem 0;
        }
        .article-body .highlight-box strong {
            color: var(--primary);
        }

        /* Article Sidebar */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            padding: 28px 24px;
            border: 1px solid var(--border);
        }
        .sidebar-card h4 {
            font-size: 1.1rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h4 i {
            color: var(--primary);
        }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--text);
            font-weight: 500;
            transition: color var(--transition);
        }
        .sidebar-list a:hover {
            color: var(--primary);
        }
        .sidebar-list a i {
            color: var(--primary-light);
            margin-top: 4px;
            font-size: 0.8rem;
        }
        .sidebar-list .post-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-weight: 400;
            margin-top: 2px;
        }
        .sidebar-cta {
            text-align: center;
        }
        .sidebar-cta .btn {
            width: 100%;
            margin-top: 12px;
        }
        .sidebar-cta p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags .tag {
            padding: 4px 14px;
            border-radius: 50px;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .sidebar-tags .tag:hover {
            background: var(--bg-card);
            border-color: var(--primary);
            transform: translateY(-1px);
        }

        /* Article Footer (share & nav) */
        .article-footer-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-footer-nav .share-buttons {
            display: flex;
            gap: 10px;
        }
        .article-footer-nav .share-buttons a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            transition: all var(--transition);
            font-size: 1rem;
        }
        .article-footer-nav .share-buttons a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .article-footer-nav .back-link a {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 500;
            color: var(--text-light);
        }
        .article-footer-nav .back-link a:hover {
            color: var(--primary);
        }

        /* Not Found */
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }

        /* ===== Related Posts Section ===== */
        .related-section {
            margin-top: 60px;
            padding-top: 40px;
            border-top: 1px solid var(--border);
        }
        .related-section h2 {
            font-size: 1.6rem;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section h2 i {
            color: var(--primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 18px 20px 20px;
        }
        .related-card .card-body h4 {
            font-size: 1rem;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body h4 a {
            color: var(--text);
        }
        .related-card .card-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .card-body .meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.85);
            padding: 60px 0 30px;
            margin-top: 0;
        }
        .site-footer .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .site-footer .logo:hover {
            color: var(--primary-light);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            width: 18px;
            text-align: center;
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .article-banner h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 50px;
            }
            .nav-list {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                border-bottom: 2px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: var(--shadow-md);
                border-radius: 0 0 var(--radius) var(--radius);
                max-height: calc(100vh - var(--header-h));
                overflow-y: auto;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav-list a {
                padding: 12px 16px;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-xs);
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.active {
                background: var(--primary-bg);
            }
            .nav-cta {
                margin-left: 0;
                width: 100%;
                margin-top: 8px;
            }
            .nav-cta .btn {
                width: 100%;
                justify-content: center;
            }
            .nav-toggle {
                display: flex;
            }
            .article-banner {
                padding: 60px 0 40px;
            }
            .article-banner h1 {
                font-size: 1.6rem;
            }
            .article-main {
                padding: 24px 20px;
            }
            .article-body {
                font-size: 1rem;
            }
            .article-body h2 {
                font-size: 1.35rem;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .article-footer-nav {
                flex-direction: column;
                align-items: flex-start;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-banner h1 {
                font-size: 1.35rem;
            }
            .article-main {
                padding: 18px 14px;
            }
            .article-body {
                font-size: 0.95rem;
            }
            .article-body h2 {
                font-size: 1.2rem;
                padding-left: 12px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .article-banner .post-meta {
                font-size: 0.8rem;
                gap: 12px;
            }
            .sidebar-card {
                padding: 20px 16px;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-up {
            animation: fadeUp 0.7s ease forwards;
        }
        .fade-up-delay-1 {
            animation-delay: 0.1s;
        }
        .fade-up-delay-2 {
            animation-delay: 0.2s;
        }
        .fade-up-delay-3 {
            animation-delay: 0.3s;
        }

        /* ===== Focus & Accessibility ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-toggle:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 3px;
            border-radius: var(--radius-xs);
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--primary-light);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary);
        }