/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f1b2d;
            --primary-light: #1a3a5c;
            --primary-lighter: #243b5e;
            --secondary: #d4a845;
            --secondary-light: #e8c36a;
            --secondary-dark: #b8922e;
            --accent: #3b82f6;
            --accent-light: #60a5fa;
            --bg: #f5f7fa;
            --bg-white: #ffffff;
            --bg-dark: #0a1422;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-light: #6b7280;
            --text-lighter: #9ca3af;
            --text-white: #f8fafc;
            --border: #e5e7eb;
            --border-light: #f0f2f5;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.12), 0 4px 8px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.16);
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --footer-bg: #0a1422;
            --section-gap: 96px;
            --section-gap-mobile: 56px;
        }

        /* ===== 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);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
            padding-bottom: 0;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--secondary); }
        a:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; font-size: inherit; border: none; background: none; }
        button:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; border-radius: 6px; }
        input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--primary); font-weight: 700; }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2.125rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(15, 27, 45, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(212, 168, 69, 0.15);
            transition: background var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo i {
            color: var(--secondary);
            font-size: 1.6rem;
        }
        .logo span { background: linear-gradient(135deg, var(--text-white) 30%, var(--secondary-light) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover span { background: linear-gradient(135deg, var(--secondary-light) 30%, var(--text-white) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { color: var(--text-white); }

        .main-nav { display: flex; align-items: center; gap: 8px; }
        .main-nav a {
            display: flex; align-items: center; gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.8);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a i { font-size: 0.9rem; color: var(--secondary); opacity: 0.7; transition: opacity var(--transition); }
        .main-nav a:hover { color: var(--text-white); background: rgba(212, 168, 69, 0.12); }
        .main-nav a:hover i { opacity: 1; }
        .main-nav a.active { color: var(--text-white); background: rgba(212, 168, 69, 0.18); }
        .main-nav a.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--secondary); border-radius: 2px; }
        .main-nav a.active i { opacity: 1; color: var(--secondary); }

        /* mobile toggle */
        .nav-toggle { display: none; background: none; color: var(--text-white); font-size: 1.6rem; padding: 4px 8px; border-radius: 6px; transition: background var(--transition); }
        .nav-toggle:hover { background: rgba(255,255,255,0.08); }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(15, 27, 45, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid rgba(212, 168, 69, 0.15);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            justify-content: center;
            align-items: center;
        }
        .mobile-bottom-tab .tab-inner {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 4px;
            width: 100%;
            max-width: 400px;
            margin: 0 auto;
            padding: 0 12px;
        }
        .mobile-bottom-tab a {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 8px 4px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.6);
            font-size: 0.7rem;
            font-weight: 500;
            transition: all var(--transition);
            text-align: center;
            min-width: 0;
        }
        .mobile-bottom-tab a i { font-size: 1.2rem; transition: all var(--transition); }
        .mobile-bottom-tab a span { display: block; line-height: 1.2; font-size: 0.7rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
        .mobile-bottom-tab a:hover { color: var(--text-white); background: rgba(212, 168, 69, 0.1); }
        .mobile-bottom-tab a.active { color: var(--secondary); }
        .mobile-bottom-tab a.active i { color: var(--secondary); }
        .mobile-bottom-tab a.active span { color: var(--secondary); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 580px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.3;
            transform: scale(1.02);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.06); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(15,27,45,0.4) 0%, rgba(10,20,34,0.85) 70%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            padding: 80px 24px 100px;
            text-align: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(212, 168, 69, 0.15);
            border: 1px solid rgba(212, 168, 69, 0.25);
            padding: 6px 20px;
            border-radius: 50px;
            color: var(--secondary-light);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 28px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 0.8rem; }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            line-height: 1.2;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--secondary-light) 10%, #fbbf24 50%, var(--secondary) 90%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.75);
            max-width: 620px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-align: center;
            justify-content: center;
        }
        .btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
        .btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
        .btn-primary {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
            color: var(--primary);
            border-color: var(--secondary);
        }
        .btn-primary:hover { background: linear-gradient(135deg, var(--secondary-light) 0%, var(--secondary) 100%); color: var(--primary); border-color: var(--secondary-light); }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255,255,255,0.3);
        }
        .btn-outline:hover { background: rgba(255,255,255,0.08); border-color: var(--secondary); color: var(--secondary-light); }
        .btn-sm { padding: 10px 20px; font-size: 0.9rem; }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .hero-stat { text-align: center; }
        .hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--secondary); display: block; line-height: 1.2; }
        .hero-stat .label { font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-top: 4px; }

        /* ===== Section Common ===== */
        .section {
            padding: var(--section-gap) 0;
        }
        .section-alt { background: var(--bg-white); }
        .section-dark { background: var(--bg-dark); }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 52px;
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { font-size: 1.05rem; color: var(--text-light); margin-bottom: 0; }
        .section-header .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(212, 168, 69, 0.1);
            padding: 4px 16px;
            border-radius: 50px;
            color: var(--secondary-dark);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
            border: 1px solid rgba(212, 168, 69, 0.2);
        }

        /* ===== Intro / Feature ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            position: relative;
        }
        .intro-image img { width: 100%; height: 400px; object-fit: cover; transition: transform 0.6s ease; }
        .intro-image:hover img { transform: scale(1.03); }
        .intro-content h3 { font-size: 1.75rem; margin-bottom: 16px; color: var(--primary); }
        .intro-content p { margin-bottom: 16px; }
        .intro-features { margin-top: 24px; display: grid; gap: 12px; }
        .intro-features li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 16px;
            background: var(--bg);
            border-radius: var(--radius-sm);
            border-left: 3px solid var(--secondary);
        }
        .intro-features li i { color: var(--secondary); font-size: 1rem; margin-top: 3px; flex-shrink: 0; }
        .intro-features li strong { color: var(--primary); display: block; font-weight: 600; }
        .intro-features li span { color: var(--text-light); font-size: 0.9rem; }

        /* ===== Category Cards ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--secondary); }
        .category-card .card-img {
            height: 160px;
            overflow: hidden;
            position: relative;
        }
        .category-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .category-card:hover .card-img img { transform: scale(1.05); }
        .category-card .card-img .tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(15,27,45,0.8);
            backdrop-filter: blur(4px);
            color: var(--secondary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid rgba(212,168,69,0.3);
        }
        .category-card .card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
        .category-card .card-body h3 { font-size: 1.15rem; margin-bottom: 8px; color: var(--primary); }
        .category-card .card-body p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 16px; flex: 1; }
        .category-card .card-body .btn { align-self: flex-start; }

        /* ===== Latest Posts ===== */
        .post-list { display: grid; gap: 20px; }
        .post-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--bg-card);
            padding: 20px 24px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .post-item:hover { box-shadow: var(--shadow); border-color: var(--secondary); transform: translateX(4px); }
        .post-item .post-num {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: var(--secondary);
            border-radius: 50%;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .post-item .post-info { flex: 1; min-width: 0; }
        .post-item .post-info h3 { font-size: 1.05rem; margin-bottom: 4px; }
        .post-item .post-info h3 a { color: var(--primary); }
        .post-item .post-info h3 a:hover { color: var(--secondary); }
        .post-item .post-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-lighter);
            margin-top: 4px;
        }
        .post-item .post-meta span { display: flex; align-items: center; gap: 4px; }
        .post-item .post-meta i { font-size: 0.7rem; color: var(--secondary); }
        .post-item .post-desc {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .empty-msg {
            text-align: center;
            padding: 48px 20px;
            color: var(--text-light);
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .empty-msg i { font-size: 2rem; color: var(--text-lighter); margin-bottom: 12px; display: block; }

        /* ===== Features / Stats ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 28px;
        }
        .feature-card {
            text-align: center;
            padding: 36px 24px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            border-radius: 50%;
            font-size: 1.6rem;
            color: var(--secondary);
            transition: transform var(--transition);
        }
        .feature-card:hover .icon { transform: scale(1.08); }
        .feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .feature-card p { font-size: 0.9rem; margin-bottom: 0; }

        /* ===== Steps / Process ===== */
        .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-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: var(--secondary);
            font-weight: 800;
            font-size: 1.2rem;
            border-radius: 50%;
            border: 2px solid rgba(212,168,69,0.2);
            transition: all var(--transition);
        }
        .step-card:hover .step-num { background: var(--secondary); color: var(--primary); border-color: var(--secondary); }
        .step-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: grid; gap: 12px; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--secondary); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            gap: 12px;
            transition: background var(--transition);
            font-size: 1rem;
        }
        .faq-question:hover { background: rgba(212, 168, 69, 0.04); }
        .faq-question i { color: var(--secondary); transition: transform var(--transition); font-size: 0.9rem; flex-shrink: 0; }
        .faq-item.open .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-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--bg-dark) 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;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { color: var(--text-white); font-size: 2.2rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.7); font-size: 1.05rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-section .btn { font-size: 1.05rem; padding: 16px 40px; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--footer-bg);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; font-size: 1.2rem; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.5); max-width: 320px; }
        .footer-col h4 { color: var(--text-white); font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: rgba(255,255,255,0.55); font-size: 0.9rem; transition: all var(--transition); display: flex; align-items: center; gap: 6px; }
        .footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-col ul li a i { font-size: 0.7rem; color: var(--secondary); opacity: 0.6; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero h1 { font-size: 2.6rem; }
            .intro-grid { gap: 40px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; --section-gap: var(--section-gap-mobile); }
            body { padding-bottom: 64px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .site-header .container { padding: 0 16px; }
            .main-nav { display: none; }
            .main-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-height); left: 0; right: 0; background: rgba(15,27,45,0.98); padding: 16px; gap: 4px; border-bottom: 1px solid rgba(212,168,69,0.15); }
            .main-nav.open a { padding: 12px 16px; width: 100%; justify-content: center; }
            .main-nav.open a.active::after { display: none; }
            .nav-toggle { display: block; }
            .mobile-bottom-tab { display: flex; }
            .hero { min-height: 480px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero .container { padding: 60px 16px 80px; }
            .hero-stats { gap: 24px; }
            .hero-stat .num { font-size: 1.5rem; }
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image img { height: 240px; }
            .category-grid { grid-template-columns: 1fr 1fr; }
            .features-grid { grid-template-columns: 1fr 1fr; }
            .steps-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .post-item { flex-direction: column; gap: 12px; padding: 16px; }
            .post-item .post-num { width: 32px; height: 32px; font-size: 0.8rem; }
            .cta-section h2 { font-size: 1.6rem; }
            .section-header { margin-bottom: 36px; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.6rem; }
            .hero p { font-size: 0.9rem; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; }
            .category-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .hero-stats { flex-direction: column; gap: 16px; align-items: center; }
            .post-item .post-meta { flex-direction: column; gap: 6px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (min-width: 769px) {
            .main-nav { display: flex !important; }
            .mobile-bottom-tab { display: none !important; }
        }

/* roulang page: article */
/* ===== :root 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
            --secondary: #0ea5e9;
            --accent: #f59e0b;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-footer: #0f172a;
            --bg-footer-light: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.12);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: all 0.25s ease;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-width: 1200px;
            --header-height: 70px;
        }

        /* ===== 基础 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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: 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;
            line-height: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        p {
            margin-bottom: 1em;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== 顶部导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            text-decoration: none;
            transition: var(--transition);
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--primary);
            background: var(--primary-light);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo:hover i {
            background: var(--primary);
            color: #fff;
            transform: rotate(-10deg);
        }
        .logo span {
            letter-spacing: -0.3px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            text-decoration: none;
            position: relative;
        }
        .main-nav a i {
            font-size: 0.9rem;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .main-nav a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
        }
        .main-nav a.active:hover {
            background: var(--primary-dark);
        }

        /* ===== 移动端底部 Tab 导航 ===== */
        .bottom-tab-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 64px;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-color);
            z-index: 999;
            padding: 0 8px;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
        }
        .bottom-tab-nav .tab-inner {
            display: flex;
            align-items: center;
            justify-content: space-around;
            height: 100%;
            max-width: 500px;
            margin: 0 auto;
        }
        .bottom-tab-nav a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-md);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
            min-width: 60px;
        }
        .bottom-tab-nav a i {
            font-size: 1.25rem;
            transition: var(--transition);
        }
        .bottom-tab-nav a:hover {
            color: var(--primary);
        }
        .bottom-tab-nav a.active {
            color: var(--primary);
        }
        .bottom-tab-nav a.active i {
            transform: scale(1.1);
        }
        .bottom-tab-nav a span {
            font-size: 0.65rem;
            line-height: 1;
        }

        /* ===== 页面主体 ===== */
        .page-main {
            padding-top: calc(var(--header-height) + 30px);
            padding-bottom: 60px;
            min-height: 80vh;
        }

        /* ===== 文章页 ===== */
        .article-wrapper {
            max-width: 860px;
            margin: 0 auto;
        }
        .article-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .article-badge i {
            font-size: 0.75rem;
        }
        .article-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            align-items: center;
            padding: 14px 0;
            margin-bottom: 24px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            font-size: 0.85rem;
            color: var(--primary);
        }
        .article-cover {
            width: 100%;
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 32px;
            box-shadow: var(--shadow-md);
        }
        .article-cover img {
            width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 16 / 9;
        }
        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-secondary);
        }
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--text-primary);
        }
        .article-content h2 {
            font-size: 1.6rem;
        }
        .article-content h3 {
            font-size: 1.3rem;
        }
        .article-content p {
            margin-bottom: 1.2em;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 1.2em;
            padding-left: 1.5em;
        }
        .article-content ul {
            list-style: disc;
        }
        .article-content ol {
            list-style: decimal;
        }
        .article-content li {
            margin-bottom: 0.4em;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 1.5em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 1.5em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: normal;
        }
        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }
        .article-content code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: #e11d48;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            padding: 20px 0;
            margin-top: 28px;
            border-top: 1px solid var(--border-color);
        }
        .article-tags .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--bg-body);
            color: var(--text-secondary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }
        .article-tags .tag i {
            font-size: 0.75rem;
        }

        /* ===== 文章导航（上下篇） ===== */
        .article-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 16px;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }
        .article-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 20px;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            max-width: 45%;
            text-decoration: none;
            box-shadow: var(--shadow-sm);
        }
        .article-nav a:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .article-nav a i {
            font-size: 1rem;
            color: var(--primary);
        }
        .article-nav .nav-next {
            text-align: right;
            flex-direction: row-reverse;
        }
        .article-nav .nav-disabled {
            opacity: 0.4;
            pointer-events: none;
            border-color: var(--border-light);
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 1px solid var(--border-color);
        }
        .related-section h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section h3 i {
            color: var(--primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 18px;
        }
        .related-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            text-decoration: none;
            color: var(--text-primary);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .related-card img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 14px 16px 16px;
        }
        .related-card .card-body h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 6px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 0;
        }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 10px;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .not-found-box h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 1.05rem;
        }
        .not-found-box .btn-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: var(--transition);
            text-decoration: none;
        }
        .not-found-box .btn-home:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(37, 99, 235, 0.35);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-footer);
            color: var(--text-white);
            padding: 50px 0 30px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 30px;
            padding-bottom: 30px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: var(--text-white);
            margin-bottom: 14px;
        }
        .footer-brand .logo i {
            background: rgba(255, 255, 255, 0.12);
            color: var(--secondary);
        }
        .footer-brand .logo:hover i {
            background: var(--primary);
            color: #fff;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-col ul li a i {
            font-size: 0.6rem;
            color: var(--secondary);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--text-white);
            padding-left: 4px;
        }
        .footer-col ul li a:hover i {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .article-title {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 60px;
            }
            .site-header .container {
                padding: 0 14px;
            }
            .logo {
                font-size: 1.15rem;
            }
            .logo i {
                font-size: 1.3rem;
                padding: 6px;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 12px 20px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: var(--shadow-lg);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .bottom-tab-nav {
                display: block;
            }
            .page-main {
                padding-top: calc(var(--header-height) + 20px);
                padding-bottom: 80px;
            }
            .article-title {
                font-size: 1.5rem;
            }
            .article-meta {
                gap: 12px;
                font-size: 0.8rem;
            }
            .article-content {
                font-size: 1rem;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .article-nav {
                flex-direction: column;
            }
            .article-nav a {
                max-width: 100%;
                justify-content: center;
            }
            .article-nav .nav-next {
                flex-direction: row;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .article-title {
                font-size: 1.3rem;
            }
            .article-badge {
                font-size: 0.7rem;
                padding: 3px 12px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
                padding: 10px 0;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .related-section h3 {
                font-size: 1.2rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .bottom-tab-nav a {
                min-width: 48px;
                padding: 4px 6px;
            }
            .bottom-tab-nav a i {
                font-size: 1.1rem;
            }
            .bottom-tab-nav a span {
                font-size: 0.6rem;
            }
            .not-found-box {
                padding: 50px 16px;
            }
            .not-found-box i {
                font-size: 3rem;
            }
            .not-found-box h2 {
                font-size: 1.4rem;
            }
        }
        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
                transform: none !important;
                opacity: 1 !important;
                pointer-events: auto !important;
                position: static !important;
                background: none !important;
                backdrop-filter: none !important;
                border-bottom: none !important;
                box-shadow: none !important;
                padding: 0 !important;
                flex-direction: row !important;
                width: auto !important;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1340a0;
            --primary-light: #e8effd;
            --primary-gradient: linear-gradient(135deg, #1a56db 0%, #7c3aed 100%);
            --secondary: #7c3aed;
            --accent: #f59e0b;
            --accent-light: #fef3c7;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
            --tab-height: 64px;
        }

        /* ===== 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-primary);
            background: var(--bg-body);
            padding-top: var(--header-height);
            padding-bottom: var(--tab-height);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: var(--radius-sm); }
        button { cursor: pointer; font-family: inherit; }
        input, textarea, select { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text-primary); font-weight: 700; }
        h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        p:last-child { margin-bottom: 0; }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .logo i {
            font-size: 1.5rem;
            color: var(--primary);
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo span { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.85; }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a i { font-size: 0.9rem; }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary-gradient);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-section-alt); }

        /* ===== Mobile Bottom Tab ===== */
        .bottom-tabs {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            height: var(--tab-height);
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border);
            box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
            padding: 0 8px;
            align-items: center;
            justify-content: space-around;
        }
        .bottom-tabs a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-md);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: all var(--transition);
            min-width: 60px;
        }
        .bottom-tabs a i { font-size: 1.2rem; }
        .bottom-tabs a:hover { color: var(--primary); background: var(--primary-light); }
        .bottom-tabs a.active { color: var(--primary); font-weight: 600; }
        .bottom-tabs a.active i { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

        /* ===== Hero / Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(26,86,219,0.72) 100%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            color: var(--text-light);
            margin-bottom: 16px;
            font-size: 2.8rem;
        }
        .page-banner p {
            color: rgba(255,255,255,0.85);
            font-size: 1.15rem;
            max-width: 640px;
            margin: 0 auto;
        }
        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        .page-banner .breadcrumb a { color: rgba(255,255,255,0.85); }
        .page-banner .breadcrumb a:hover { color: #fff; }
        .page-banner .breadcrumb span { color: rgba(255,255,255,0.5); }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-header p {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .tagline {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .card-image {
            position: relative;
            width: 100%;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-section-alt);
        }
        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-image img {
            transform: scale(1.05);
        }
        .card-image .badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(255,255,255,0.92);
            color: var(--text-primary);
            backdrop-filter: blur(4px);
            box-shadow: var(--shadow-sm);
        }
        .card-image .badge.hot { background: #fee2e2; color: #dc2626; }
        .card-image .badge.new { background: #dbeafe; color: #2563eb; }
        .card-image .badge.stable { background: #d1fae5; color: #059669; }
        .card-image .badge.special { background: #fef3c7; color: #d97706; }
        .card-body {
            padding: 22px 24px 24px;
        }
        .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-body h3 a {
            color: var(--text-primary);
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .card-meta i { margin-right: 4px; }
        .card-meta .tag {
            display: inline-block;
            padding: 2px 10px;
            border-radius: 12px;
            background: var(--bg-section-alt);
            color: var(--text-secondary);
            font-size: 0.75rem;
        }

        /* ===== Filter Tabs ===== */
        .filter-tabs {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            margin-bottom: 40px;
        }
        .filter-tabs button {
            padding: 8px 22px;
            border-radius: 24px;
            border: 1px solid var(--border);
            background: var(--bg-white);
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .filter-tabs button:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .filter-tabs button.active {
            background: var(--primary-gradient);
            color: #fff;
            border-color: transparent;
            box-shadow: 0 4px 14px rgba(26,86,219,0.3);
        }

        /* ===== Feature List ===== */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .feature-item {
            display: flex;
            gap: 18px;
            padding: 24px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .feature-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .feature-item .icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            background: var(--primary-gradient);
        }
        .feature-item .icon.purple { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
        .feature-item .icon.gold { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
        .feature-item .icon.green { background: linear-gradient(135deg, #059669, #34d399); }
        .feature-item .icon.rose { background: linear-gradient(135deg, #e11d48, #fb7185); }
        .feature-item h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .feature-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item {
            padding: 32px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .stat-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-item .number {
            font-size: 2.6rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .label {
            font-size: 0.95rem;
            color: var(--text-secondary);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-section-alt);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: 80px 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.9) 0%, rgba(26,86,219,0.8) 100%);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            color: var(--text-light);
            font-size: 2.2rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.85);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            border: none;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26,86,219,0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26,86,219,0.4);
            color: #fff;
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.1);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.8);
            padding: 60px 0 0;
        }
        .site-footer .logo {
            color: #fff;
            margin-bottom: 12px;
        }
        .site-footer .logo i { -webkit-text-fill-color: initial; color: var(--primary); }
        .site-footer .logo span { -webkit-text-fill-color: initial; color: #fff; }
        .site-footer p { color: rgba(255,255,255,0.6); font-size: 0.95rem; }
        .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);
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }
        .footer-col ul li a i { font-size: 0.65rem; }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .page-banner h1 { font-size: 2.2rem; }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; --tab-height: 60px; }
            body { padding-top: var(--header-height); padding-bottom: var(--tab-height); }
            .main-nav { display: none; }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(16px);
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                gap: 4px;
            }
            .main-nav.open a { padding: 12px 16px; border-radius: var(--radius-sm); }
            .nav-toggle { display: block; }
            .bottom-tabs { display: flex; }
            .page-banner { padding: 60px 0 40px; min-height: 220px; }
            .page-banner h1 { font-size: 1.8rem; }
            .page-banner p { font-size: 1rem; }
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 32px; }
            .section-header h2 { font-size: 1.6rem; }
            .card-grid { grid-template-columns: 1fr; gap: 20px; }
            .feature-list { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-item .number { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .filter-tabs { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 8px; justify-content: flex-start; }
            .filter-tabs button { flex-shrink: 0; }
            .cta-section h2 { font-size: 1.6rem; }
            .btn { padding: 12px 24px; font-size: 0.95rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .page-banner h1 { font-size: 1.5rem; }
            .page-banner p { font-size: 0.9rem; }
            .card-body { padding: 16px 18px 20px; }
            .stat-item { padding: 20px 12px; }
            .stat-item .number { font-size: 1.6rem; }
            .faq-question { padding: 14px 16px; font-size: 0.95rem; }
            .faq-answer { padding: 0 16px; font-size: 0.9rem; }
            .faq-item.open .faq-answer { padding: 0 16px 16px; }
            .feature-item { padding: 18px; }
            .feature-item .icon { width: 44px; height: 44px; font-size: 1.2rem; }
            .bottom-tabs a { font-size: 0.65rem; min-width: 50px; }
            .bottom-tabs a i { font-size: 1.1rem; }
        }