/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f1a3a;
            --primary-light: #1a2d5a;
            --primary-lighter: #2a4070;
            --secondary: #d4a84b;
            --secondary-light: #e8c46a;
            --secondary-dark: #b8922e;
            --accent: #f0c85a;
            --bg-white: #ffffff;
            --bg-light: #f5f7fa;
            --bg-gray: #eef1f5;
            --bg-dark: #0a1228;
            --text-dark: #111827;
            --text-body: #374151;
            --text-light: #6b7280;
            --text-lighter: #9ca3af;
            --text-white: #ffffff;
            --border: #e5e7eb;
            --border-light: #f0f0f0;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.08);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 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-body);
            background: var(--bg-white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--secondary); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button, input, textarea, select { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 700; }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); text-align: center; margin-bottom: 0.5em; }
        h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }
        p { margin-bottom: 1em; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow { max-width: 880px; }
        section { padding: 80px 0; }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--secondary);
            background: rgba(212, 168, 75, 0.1);
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .text-center { text-align: center; }
        .text-secondary { color: var(--secondary); }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .logo i { color: var(--secondary); font-size: 1.4rem; }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-main { display: flex; align-items: center; gap: 32px; }
        .nav-main a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            padding: 6px 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-main a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary);
            transition: var(--transition);
            border-radius: 2px;
        }
        .nav-main a:hover { color: var(--primary); }
        .nav-main a:hover::after { width: 100%; }
        .nav-main a.active { color: var(--primary); font-weight: 600; }
        .nav-main a.active::after { width: 100%; }
        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-light);
            border-radius: 24px;
            padding: 0 16px;
            height: 40px;
            border: 1px solid transparent;
            transition: var(--transition);
            min-width: 180px;
        }
        .search-box:focus-within {
            border-color: var(--secondary);
            background: var(--bg-white);
            box-shadow: 0 0 0 4px rgba(212,168,75,0.1);
        }
        .search-box i { color: var(--text-lighter); font-size: 0.9rem; }
        .search-box input {
            background: none;
            border: none;
            padding: 0 8px;
            height: 100%;
            width: 100%;
            font-size: 0.9rem;
            color: var(--text-dark);
        }
        .search-box input::placeholder { color: var(--text-lighter); }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--primary);
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 24px;
            border-radius: 24px;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(212,168,75,0.25);
            white-space: nowrap;
        }
        .btn-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(212,168,75,0.35); color: var(--primary); }
        .btn-cta:active { transform: translateY(0); }
        .btn-cta-outline {
            background: transparent;
            color: var(--secondary);
            border: 2px solid var(--secondary);
            box-shadow: none;
        }
        .btn-cta-outline:hover { background: var(--secondary); color: var(--primary); box-shadow: 0 4px 16px rgba(212,168,75,0.2); }
        .menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
        .menu-toggle span { width: 24px; height: 2px; background: var(--text-dark); border-radius: 2px; transition: var(--transition); }
        .menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .menu-toggle.active span:nth-child(2) { opacity: 0; }
        .menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero ===== */
        .hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            min-height: 80vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg-white), transparent);
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-content { max-width: 700px; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(212,168,75,0.15);
            color: var(--secondary);
            padding: 6px 20px;
            border-radius: 24px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(212,168,75,0.2);
            backdrop-filter: blur(4px);
        }
        .hero h1 { color: var(--text-white); font-size: clamp(2.2rem, 5.5vw, 3.6rem); line-height: 1.2; margin-bottom: 20px; }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            color: rgba(255,255,255,0.75);
            font-size: clamp(1rem, 2vw, 1.15rem);
            max-width: 560px;
            margin-bottom: 36px;
            line-height: 1.8;
        }
        .hero-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
        .hero-actions .btn-cta { font-size: 1rem; padding: 14px 36px; border-radius: 28px; }
        .hero-actions .btn-ghost {
            color: var(--text-white);
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 14px 24px;
            border-radius: 28px;
            border: 1px solid rgba(255,255,255,0.2);
            transition: var(--transition);
        }
        .hero-actions .btn-ghost:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.4); color: var(--text-white); }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 56px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .hero-stat { color: var(--text-white); }
        .hero-stat .num { font-size: 1.8rem; font-weight: 800; color: var(--secondary); }
        .hero-stat .label { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-top: 2px; }

        /* ===== Features / Advantages ===== */
        .features { background: var(--bg-white); }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-top: 48px;
        }
        .feature-card {
            background: var(--bg-light);
            border-radius: var(--radius);
            padding: 40px 32px;
            text-align: center;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--border); background: var(--bg-white); }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--secondary);
            font-size: 1.6rem;
        }
        .feature-card h3 { margin-bottom: 12px; }
        .feature-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 0; }

        /* ===== Categories ===== */
        .categories { background: var(--bg-light); }
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 48px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-white);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            cursor: pointer;
            min-height: 260px;
            display: flex;
            align-items: flex-end;
        }
        .category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .category-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
        .category-card .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15,26,58,0.85) 0%, rgba(15,26,58,0.2) 60%, transparent 100%);
            transition: var(--transition);
        }
        .category-card:hover .overlay { background: linear-gradient(to top, rgba(15,26,58,0.9) 0%, rgba(15,26,58,0.3) 60%, transparent 100%); }
        .category-card .info {
            position: relative;
            z-index: 2;
            padding: 28px 24px;
            color: var(--text-white);
            width: 100%;
        }
        .category-card .info h3 { color: var(--text-white); font-size: 1.2rem; margin-bottom: 6px; }
        .category-card .info p { color: rgba(255,255,255,0.75); font-size: 0.9rem; margin-bottom: 0; }
        .category-card .info .tag {
            display: inline-block;
            background: var(--secondary);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 2px 12px;
            border-radius: 12px;
            margin-bottom: 10px;
        }

        /* ===== Stats Counter ===== */
        .stats-section {
            background: var(--bg-dark);
            color: var(--text-white);
            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;
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 2;
        }
        .stat-item { text-align: center; padding: 20px; }
        .stat-item .num { font-size: 2.6rem; font-weight: 800; color: var(--secondary); line-height: 1.2; }
        .stat-item .label { color: rgba(255,255,255,0.7); font-size: 0.95rem; margin-top: 8px; }
        .stat-item .icon { font-size: 2rem; color: rgba(212,168,75,0.3); margin-bottom: 12px; }

        /* ===== Latest Posts (CMS) ===== */
        .latest-posts { background: var(--bg-white); }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 48px;
        }
        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--secondary); }
        .post-card .thumb {
            height: 200px;
            background: var(--bg-gray);
            overflow: hidden;
            position: relative;
        }
        .post-card .thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; transition: var(--transition); }
        .post-card:hover .thumb img { transform: scale(1.05); }
        .post-card .thumb .cat-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--secondary);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 2px 14px;
            border-radius: 12px;
            z-index: 2;
        }
        .post-card .body { padding: 20px 24px 24px; }
        .post-card .body .meta { display: flex; align-items: center; gap: 12px; font-size: 0.8rem; color: var(--text-lighter); margin-bottom: 8px; }
        .post-card .body .meta i { margin-right: 4px; }
        .post-card .body h3 { font-size: 1.05rem; margin-bottom: 8px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .post-card .body p { color: var(--text-light); font-size: 0.9rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 0; }
        .post-card .body .read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--secondary);
            font-weight: 600;
            font-size: 0.85rem;
            margin-top: 14px;
            transition: var(--transition);
        }
        .post-card .body .read-more:hover { gap: 12px; color: var(--secondary-dark); }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-light);
            background: var(--bg-light);
            border-radius: var(--radius);
        }
        .posts-empty i { font-size: 2.4rem; color: var(--text-lighter); margin-bottom: 16px; display: block; }
        .btn-more-wrap { text-align: center; margin-top: 40px; }

        /* ===== Process / Steps ===== */
        .process { background: var(--bg-light); }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            margin-top: 48px;
            position: relative;
        }
        .process-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(to right, var(--secondary), var(--secondary-light), var(--secondary));
            opacity: 0.3;
            z-index: 0;
        }
        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-white);
            padding: 32px 16px 24px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--primary);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(212,168,75,0.25);
        }
        .step-card h4 { font-size: 1rem; margin-bottom: 6px; }
        .step-card p { font-size: 0.85rem; color: var(--text-light); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq { background: var(--bg-white); }
        .faq-list { max-width: 780px; margin: 48px auto 0; }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 20px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .faq-item:first-child { border-top: 1px solid var(--border); }
        .faq-q {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--text-dark);
            font-size: 1.05rem;
            gap: 16px;
        }
        .faq-q i { color: var(--secondary); font-size: 0.9rem; transition: var(--transition); flex-shrink: 0; }
        .faq-item.active .faq-q i { transform: rotate(180deg); }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-a { max-height: 300px; padding-top: 16px; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 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-3.png') center center / cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .cta-section h2 { color: var(--text-white); margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.75); font-size: 1.1rem; max-width: 600px; margin: 0 auto 36px; }
        .cta-section .btn-cta { font-size: 1.05rem; padding: 16px 44px; border-radius: 28px; }
        .cta-section .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(212,168,75,0.4); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 16px; }
        .footer-brand .logo span { -webkit-text-fill-color: var(--text-white); background: none; }
        .footer-brand p { font-size: 0.9rem; max-width: 300px; }
        .footer-col h4 { color: var(--text-white); font-size: 0.95rem; margin-bottom: 20px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { font-size: 0.9rem; color: rgba(255,255,255,0.55); transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--secondary); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.35); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .categories-grid { grid-template-columns: repeat(2, 1fr); }
            .posts-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(3, 1fr); }
            .process-grid::before { display: none; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            section { padding: 60px 0; }
            .nav-main { display: none; }
            .nav-main.open { display: flex; flex-direction: column; position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--bg-white); padding: 20px 24px; box-shadow: var(--shadow-lg); border-bottom: 1px solid var(--border); gap: 16px; align-items: flex-start; z-index: 999; }
            .nav-main.open a { width: 100%; padding: 8px 0; }
            .menu-toggle { display: flex; }
            .header-right .search-box { display: none; }
            .header-right .btn-cta { font-size: 0.8rem; padding: 8px 18px; }
            .hero { padding: 120px 0 80px; min-height: auto; }
            .hero-stats { flex-wrap: wrap; gap: 20px; }
            .hero-stat { flex: 1; min-width: 100px; }
            .features-grid { grid-template-columns: 1fr; }
            .categories-grid { grid-template-columns: 1fr; }
            .posts-grid { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 60px 0; }
            .faq-list { margin-top: 32px; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-actions .btn-cta { text-align: center; justify-content: center; }
            .hero-actions .btn-ghost { text-align: center; justify-content: center; }
            .process-grid { grid-template-columns: 1fr 1fr; }
            .stat-item .num { font-size: 1.8rem; }
            .category-card { min-height: 200px; }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--bg-light); }
        ::-webkit-scrollbar-thumb { background: var(--text-lighter); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

        /* ===== Focus ===== */
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; border-radius: 4px; }

        /* ===== Animations ===== */
        @keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
        .animate-fade-up { animation: fadeUp 0.6s ease forwards; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4050;
            --primary-dark: #0f1a24;
            --accent: #f5a623;
            --accent-hover: #e0941a;
            --accent-light: #fef3e0;
            --bg-body: #f8f9fb;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f1a24;
            --bg-section-alt: #f0f2f5;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-muted: #8899aa;
            --text-white: #ffffff;
            --border-light: #e8ecf0;
            --border-medium: #d0d6dd;
            --shadow-sm: 0 2px 8px rgba(26, 42, 58, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 42, 58, 0.10);
            --shadow-lg: 0 20px 60px rgba(26, 42, 58, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

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

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .logo i {
            color: var(--accent);
            font-size: 26px;
        }
        .logo span {
            color: var(--accent);
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-main a:hover {
            color: var(--primary);
            background: var(--bg-section-alt);
        }
        .nav-main a.active {
            color: var(--primary);
            background: var(--accent-light);
            font-weight: 600;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-toggle {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 16px;
            transition: all var(--transition);
            background: var(--bg-section-alt);
        }
        .search-toggle:hover {
            background: var(--border-light);
            color: var(--primary);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            color: var(--text-white);
            background: var(--accent);
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(245, 166, 35, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            background: transparent;
            border: 2px solid var(--border-medium);
            transition: all var(--transition);
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: var(--accent-light);
        }
        .mobile-menu-btn {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--text-primary);
            background: var(--bg-section-alt);
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all var(--transition);
                z-index: 999;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .mobile-menu-btn {
                display: flex;
            }
            .nav-actions .btn-primary span {
                display: none;
            }
            .nav-actions .btn-primary {
                padding: 10px 14px;
            }
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 140px 0 60px;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            pointer-events: none;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 36, 0.88) 0%, rgba(26, 42, 58, 0.72) 100%);
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .article-hero .breadcrumb a:hover {
            color: var(--accent);
        }
        .article-hero .breadcrumb span {
            color: rgba(255, 255, 255, 0.9);
        }
        .article-hero h1 {
            font-size: 40px;
            font-weight: 800;
            color: var(--text-white);
            max-width: 800px;
            margin: 0 auto 16px;
            letter-spacing: -0.5px;
            line-height: 1.25;
        }
        .article-hero .meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            flex-wrap: wrap;
        }
        .article-hero .meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-hero .meta i {
            color: var(--accent);
        }
        .article-hero .meta .category-tag {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 2px 12px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 13px;
        }
        @media (max-width: 768px) {
            .article-hero {
                padding: 120px 0 40px;
                min-height: 240px;
            }
            .article-hero h1 {
                font-size: 26px;
            }
            .article-hero .meta {
                gap: 12px;
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 22px;
            }
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0 80px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            align-items: start;
        }
        .article-main {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 40px;
            border: 1px solid var(--border-light);
        }
        .article-main .content-body {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-main .content-body p {
            margin-bottom: 20px;
        }
        .article-main .content-body h2,
        .article-main .content-body h3 {
            margin-top: 36px;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .article-main .content-body h2 {
            font-size: 24px;
        }
        .article-main .content-body h3 {
            font-size: 20px;
        }
        .article-main .content-body ul,
        .article-main .content-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-main .content-body li {
            margin-bottom: 8px;
        }
        .article-main .content-body ul li {
            list-style: disc;
        }
        .article-main .content-body ol li {
            list-style: decimal;
        }
        .article-main .content-body img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-main .content-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 20px;
            margin: 24px 0;
            background: var(--accent-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-primary);
            font-style: italic;
        }
        .article-main .content-body a {
            color: var(--accent);
            text-decoration: underline;
        }
        .article-main .content-body a:hover {
            color: var(--accent-hover);
        }
        .article-footer-meta {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-footer-meta .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-footer-meta .tags span {
            background: var(--bg-section-alt);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-secondary);
        }
        .article-footer-meta .share {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .article-footer-meta .share a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-section-alt);
            color: var(--text-secondary);
            transition: all var(--transition);
            font-size: 14px;
        }
        .article-footer-meta .share a:hover {
            background: var(--accent);
            color: var(--text-white);
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 28px;
            border: 1px solid var(--border-light);
        }
        .sidebar-card h3 {
            font-size: 18px;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i {
            color: var(--accent);
        }
        .sidebar-card .related-item {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .sidebar-card .related-item:last-child {
            border-bottom: none;
        }
        .sidebar-card .related-item:hover {
            padding-left: 8px;
        }
        .sidebar-card .related-item img {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-section-alt);
        }
        .sidebar-card .related-item .info h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .sidebar-card .related-item .info h4 a:hover {
            color: var(--accent);
        }
        .sidebar-card .related-item .info .date {
            font-size: 12px;
            color: var(--text-muted);
        }
        .sidebar-cta {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 32px 28px;
            text-align: center;
            border-radius: var(--radius-md);
            position: relative;
            overflow: hidden;
        }
        .sidebar-cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.10;
            pointer-events: none;
        }
        .sidebar-cta * {
            position: relative;
            z-index: 1;
        }
        .sidebar-cta h4 {
            color: var(--text-white);
            font-size: 20px;
            margin-bottom: 10px;
        }
        .sidebar-cta p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }
        .sidebar-cta .btn-primary {
            background: var(--text-white);
            color: var(--primary-dark);
        }
        .sidebar-cta .btn-primary:hover {
            background: var(--accent);
            color: var(--text-white);
        }
        @media (max-width: 992px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .sidebar-cta {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 640px) {
            .article-main {
                padding: 24px 16px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .article-footer-meta {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 520px) {
            .article-main .content-body {
                font-size: 15px;
            }
        }

        /* ===== Related Posts Section ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-section-alt);
        }
        .related-section .section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            text-align: center;
        }
        .related-section .section-sub {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 40px;
            font-size: 16px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--bg-section-alt);
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
        }
        .related-card .card-body .cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card .card-body h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card .card-body h4 a:hover {
            color: var(--accent);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }
        .related-card .card-body .date {
            font-size: 13px;
            color: var(--text-muted);
        }
        @media (max-width: 992px) {
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 640px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section .section-title {
                font-size: 22px;
            }
        }

        /* ===== CTA Section ===== */
        .article-cta {
            padding: 80px 0;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .article-cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .article-cta .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .article-cta h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .article-cta p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .article-cta .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .article-cta .btn-primary {
            background: var(--text-white);
            color: var(--primary-dark);
            font-size: 16px;
            padding: 14px 36px;
        }
        .article-cta .btn-primary:hover {
            background: var(--accent);
            color: var(--text-white);
            box-shadow: 0 8px 30px rgba(245, 166, 35, 0.4);
        }
        .article-cta .btn-outline {
            border-color: rgba(255, 255, 255, 0.3);
            color: var(--text-white);
        }
        .article-cta .btn-outline:hover {
            border-color: var(--text-white);
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white);
        }
        @media (max-width: 768px) {
            .article-cta h2 {
                font-size: 26px;
            }
            .article-cta p {
                font-size: 15px;
            }
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-box i {
            font-size: 64px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .not-found-box h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .not-found-box .btn-primary {
            display: inline-flex;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 60px 0 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .site-footer .footer-brand .logo {
            color: var(--text-white);
            font-size: 24px;
            margin-bottom: 16px;
        }
        .site-footer .footer-brand .logo i {
            color: var(--accent);
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
        }
        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }
        .site-footer .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: all var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .site-footer .footer-col ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .site-footer .footer-col ul li a i {
            width: 16px;
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        @media (max-width: 992px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 640px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

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

        /* ===== Selection ===== */
        ::selection {
            background: var(--accent);
            color: var(--text-white);
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --secondary: #7c3aed;
            --secondary-light: #a78bfa;
            --accent: #f59e0b;
            --bg: #ffffff;
            --bg-light: #f8fafc;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.10);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
            --grid-gap: 32px;
        }

        /* ===== 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;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button,
        input,
        textarea,
        select {
            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);
        }

        h1 {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.5rem, 3vw, 2.2rem);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.25rem;
        }
        h4 {
            font-size: 1.1rem;
        }

        p {
            margin-bottom: 1rem;
            color: var(--text-weak);
        }
        p:last-child {
            margin-bottom: 0;
        }

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

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

        /* ===== Utility ===== */
        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--bg-light);
            color: var(--primary);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .badge-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .badge-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 28px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-sm);
        }
        .btn:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn:active {
            transform: translateY(0);
            box-shadow: var(--shadow-sm);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--border);
        }
        .btn-outline:hover {
            background: var(--bg-light);
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-accent {
            background: var(--accent);
            color: #1e293b;
        }
        .btn-accent:hover {
            background: #d97706;
            color: #1e293b;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn i {
            font-size: 1.1em;
        }

        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--bg-light);
            color: var(--text-weak);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .tag:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* ===== Header & Nav (SaaS Command Bar Style) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.3em;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-main a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-weak);
            transition: all var(--transition);
            position: relative;
        }
        .nav-main a:hover {
            color: var(--text);
            background: var(--bg-light);
        }
        .nav-main a.active {
            color: var(--primary);
            background: rgba(26, 86, 219, 0.08);
            font-weight: 600;
        }
        .nav-main a.active::after {
            display: none;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .search-toggle {
            width: 40px;
            height: 40px;
            border-radius: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-light);
            color: var(--text-weak);
            border: 1px solid var(--border);
            transition: all var(--transition);
            font-size: 1rem;
        }
        .search-toggle:hover {
            background: var(--border);
            color: var(--text);
        }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 100px;
            align-items: center;
            justify-content: center;
            background: var(--bg-light);
            color: var(--text);
            border: 1px solid var(--border);
            font-size: 1.2rem;
            transition: all var(--transition);
        }
        .mobile-toggle:hover {
            background: var(--border);
        }

        @media (max-width: 768px) {
            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav-main.is-open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a {
                width: 100%;
                padding: 12px 18px;
                border-radius: var(--radius-sm);
                font-size: 1rem;
            }
            .mobile-toggle {
                display: flex;
            }
            .nav-actions .btn span {
                display: none;
            }
            .header-inner {
                padding: 0 16px;
            }
        }

        @media (max-width: 480px) {
            .logo {
                font-size: 1.2rem;
            }
            .nav-actions .btn {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            padding-top: calc(var(--header-height) + 40px);
            padding-bottom: 60px;
            background: var(--bg-light);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .page-hero .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.40) 0%, rgba(15, 23, 42, 0.10) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-hero .badge {
            margin-bottom: 16px;
        }
        .page-hero h1 {
            max-width: 800px;
            margin: 0 auto 16px;
        }
        .page-hero .hero-desc {
            max-width: 600px;
            margin: 0 auto 28px;
            font-size: 1.1rem;
            color: var(--text-weak);
        }
        .page-hero .hero-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            .page-hero {
                padding-top: calc(var(--header-height) + 24px);
                padding-bottom: 40px;
                min-height: 260px;
            }
            .page-hero .hero-desc {
                font-size: 1rem;
            }
        }

        /* ===== Guide Overview ===== */
        .guide-overview-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: var(--grid-gap);
            margin-top: 12px;
        }
        .guide-overview-card {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .guide-overview-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .guide-overview-card .icon-box {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            color: #fff;
            font-size: 1.5rem;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.20);
        }
        .guide-overview-card h3 {
            margin-bottom: 8px;
        }
        .guide-overview-card p {
            font-size: 0.92rem;
            margin-bottom: 0;
        }
        .guide-overview-card .step-num {
            display: inline-block;
            width: 28px;
            height: 28px;
            border-radius: 100px;
            background: var(--bg-light);
            color: var(--primary);
            font-weight: 700;
            font-size: 0.85rem;
            line-height: 28px;
            text-align: center;
            margin-bottom: 12px;
        }

        /* ===== Guide Cards (分类卡片) ===== */
        .guide-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--grid-gap);
        }
        .guide-card {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .guide-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .guide-card .card-img {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-light);
        }
        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .guide-card:hover .card-img img {
            transform: scale(1.04);
        }
        .guide-card .card-body {
            padding: 24px 20px 20px;
        }
        .guide-card .card-body .badge {
            margin-bottom: 10px;
        }
        .guide-card .card-body h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .guide-card .card-body p {
            font-size: 0.92rem;
            margin-bottom: 16px;
        }
        .guide-card .card-footer {
            padding: 0 20px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .guide-card .card-footer .btn {
            font-size: 0.85rem;
            padding: 8px 18px;
        }
        .guide-card .card-footer .tag {
            font-size: 0.7rem;
        }

        /* ===== Step-by-Step ===== */
        .steps-section {
            background: var(--bg-light);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: var(--grid-gap);
            counter-reset: step-counter;
        }
        .step-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            position: relative;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .step-item .step-index {
            width: 40px;
            height: 40px;
            border-radius: 100px;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.20);
        }
        .step-item h3 {
            margin-bottom: 8px;
            font-size: 1.1rem;
        }
        .step-item p {
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ===== Safety Tips ===== */
        .safety-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: var(--grid-gap);
        }
        .safety-card {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .safety-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .safety-card .safety-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(26, 86, 219, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.2rem;
        }
        .safety-card .safety-content h4 {
            font-size: 1rem;
            margin-bottom: 4px;
        }
        .safety-card .safety-content p {
            font-size: 0.88rem;
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg);
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
            background: var(--bg);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item.is-open {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            background: transparent;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-question i {
            color: var(--text-weak);
            transition: transform var(--transition);
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .faq-item.is-open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 22px;
            color: var(--text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.is-open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26, 86, 219, 0.15) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 50%, rgba(124, 58, 237, 0.10) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-section .btn {
            background: #fff;
            color: var(--text);
            border-color: transparent;
        }
        .cta-section .btn:hover {
            background: var(--bg-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.20);
        }
        .cta-section .btn-outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.30);
        }
        .cta-section .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(255, 255, 255, 0.50);
            color: #fff;
        }

        @media (max-width: 768px) {
            .cta-section .container {
                padding: 48px 16px;
            }
            .cta-section .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }

        /* ===== Stats Strip ===== */
        .stats-strip {
            background: var(--bg-light);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 24px;
            padding: 40px 0;
            text-align: center;
        }
        .stat-item .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--text-weak);
            margin-top: 4px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 0;
        }
        .site-footer a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition);
        }
        .site-footer a:hover {
            color: #fff;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
            font-size: 1.3rem;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.5);
            max-width: 320px;
            margin-bottom: 0;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-col ul li a i {
            font-size: 0.85rem;
            width: 18px;
            color: var(--primary-light);
        }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            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: #fff;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* ===== Responsive Extra ===== */
        @media (max-width: 1024px) {
            :root {
                --grid-gap: 24px;
            }
            .guide-cards-grid {
                grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .guide-overview-grid {
                grid-template-columns: 1fr;
            }
            .guide-cards-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .safety-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 1.5rem;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.88rem;
            }
            .faq-item.is-open .faq-answer {
                padding: 0 16px 16px;
            }
            .section-padding {
                padding: 36px 0;
            }
            .section-title {
                margin-bottom: 28px;
            }
            .section-title h2 {
                font-size: 1.3rem;
            }
        }