/* roulang page: index */
/* ===== CSS Design System ===== */
        :root {
            --color-primary: #1a56db;
            --color-primary-dark: #1e40af;
            --color-primary-light: #3b82f6;
            --color-primary-bg: #eff6ff;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-accent-bg: #fffbeb;
            --color-success: #10b981;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-bg-card: #ffffff;
            --color-text: #1e293b;
            --color-text-soft: #475569;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-footer-bg: #0f172a;
            --color-footer-text: #cbd5e1;
            --color-footer-link: #94a3b8;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.16);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --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(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--color-primary-dark); }
        a:focus-visible { outline: 3px solid var(--color-primary-light); outline-offset: 2px; border-radius: 4px; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; line-height: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 2.75rem; 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: 1em; }
        p:last-child { margin-bottom: 0; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 880px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .text-accent { color: var(--color-accent); }
        .text-primary { color: var(--color-primary); }
        .text-muted { color: var(--color-text-muted); }
        .text-soft { color: var(--color-text-soft); }
        .mb-12 { margin-bottom: 12px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-32 { margin-bottom: 32px; }
        .mb-40 { margin-bottom: 40px; }
        .mb-48 { margin-bottom: 48px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mt-40 { margin-top: 40px; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== Section Spacing ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-accent-bg {
            background: var(--color-primary-bg);
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            color: var(--color-text-soft);
            font-size: 1.1rem;
            max-width: 640px;
            margin: 0 auto;
        }
        .section-badge {
            display: inline-block;
            background: var(--color-primary-bg);
            color: var(--color-primary);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border-light);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .header-logo i {
            color: var(--color-primary);
            font-size: 1.6rem;
        }
        .header-logo span {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .header-logo:hover { color: var(--color-text); }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .header-nav a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-soft);
            padding: 6px 0;
            position: relative;
            transition: color var(--transition);
        }
        .header-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
            transform: scaleX(0);
            transform-origin: right center;
            transition: transform var(--transition);
        }
        .header-nav a:hover { color: var(--color-primary); }
        .header-nav a:hover::after { transform: scaleX(1); transform-origin: left center; }
        .header-nav a.active { color: var(--color-primary); }
        .header-nav a.active::after { transform: scaleX(1); }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .header-search {
            position: relative;
            width: 200px;
        }
        .header-search input {
            width: 100%;
            padding: 8px 36px 8px 14px;
            border: 1px solid var(--color-border);
            border-radius: 100px;
            font-size: 0.875rem;
            background: var(--color-bg-alt);
            color: var(--color-text);
            transition: border-color var(--transition), box-shadow var(--transition);
            outline: none;
        }
        .header-search input:focus {
            border-color: var(--color-primary-light);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.12);
        }
        .header-search input::placeholder { color: var(--color-text-muted); }
        .header-search i {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--color-text-muted);
            font-size: 0.85rem;
            pointer-events: none;
        }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-primary);
            color: #fff;
            padding: 8px 22px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            white-space: nowrap;
        }
        .header-cta:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .header-cta:active {
            transform: translateY(0);
        }
        .header-cta i { font-size: 0.85rem; }

        /* ===== Mobile Menu Toggle ===== */
        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .mobile-menu-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: var(--transition);
        }
        .mobile-menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
        .mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
        .mobile-menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

        /* ===== Hero ===== */
        .hero {
            min-height: 85vh;
            display: flex;
            align-items: center;
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            margin-top: var(--header-height);
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.82) 0%, rgba(30,64,175,0.65) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-content {
            max-width: 760px;
            padding: 60px 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
            padding: 6px 18px;
            border-radius: 100px;
            margin-bottom: 24px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .hero-badge i { font-size: 0.75rem; color: var(--color-accent); }
        .hero h1 {
            font-size: 3.25rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.85);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 600px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--color-accent);
            color: #1e293b;
            font-weight: 700;
            font-size: 1.05rem;
            padding: 14px 32px;
            border-radius: 100px;
            transition: all var(--transition);
            box-shadow: 0 4px 14px rgba(245,158,11,0.35);
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            color: #1e293b;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.4);
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-primary i { font-size: 0.9rem; }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 14px 32px;
            border-radius: 100px;
            border: 2px solid rgba(255,255,255,0.4);
            transition: all var(--transition);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.12);
            color: #fff;
            border-color: rgba(255,255,255,0.7);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.15);
        }
        .hero-stat-item {
            color: #fff;
        }
        .hero-stat-item .number {
            font-size: 1.8rem;
            font-weight: 800;
            line-height: 1.2;
        }
        .hero-stat-item .label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.7);
            margin-top: 2px;
        }

        /* ===== Features / Services ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-primary-light);
        }
        .feature-card:hover::before { opacity: 1; }
        .feature-card .icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            background: var(--color-primary-bg);
            color: var(--color-primary);
        }
        .feature-card:nth-child(2) .icon-wrap { background: var(--color-accent-bg); color: var(--color-accent); }
        .feature-card:nth-child(3) .icon-wrap { background: #ecfdf5; color: var(--color-success); }
        .feature-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
        .feature-card p { color: var(--color-text-soft); font-size: 0.95rem; margin-bottom: 0; }
        .feature-card .feature-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-primary);
        }
        .feature-card .feature-link i { font-size: 0.75rem; transition: transform var(--transition); }
        .feature-card .feature-link:hover i { transform: translateX(4px); }

        /* ===== Stats Counter ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item {
            padding: 32px 16px;
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .stat-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .stat-item .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            margin-top: 6px;
        }
        .stat-item .stat-icon {
            font-size: 1.6rem;
            color: var(--color-primary-light);
            margin-bottom: 12px;
        }

        /* ===== CMS News List ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .news-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
        }
        .news-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-primary-light);
        }
        .news-card .news-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .news-card .news-body {
            padding: 24px;
        }
        .news-card .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin-bottom: 12px;
        }
        .news-card .news-meta .category {
            display: inline-block;
            background: var(--color-primary-bg);
            color: var(--color-primary);
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 100px;
            font-size: 0.75rem;
        }
        .news-card .news-meta .date i { margin-right: 4px; }
        .news-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-card h3 a {
            color: var(--color-text);
            transition: color var(--transition);
        }
        .news-card h3 a:hover { color: var(--color-primary); }
        .news-card .news-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card .news-readmore {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--color-primary);
        }
        .news-card .news-readmore i { font-size: 0.7rem; transition: transform var(--transition); }
        .news-card .news-readmore:hover i { transform: translateX(4px); }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--color-text-muted);
            background: var(--color-bg-alt);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--color-border);
        }
        .news-empty i {
            font-size: 2.5rem;
            margin-bottom: 16px;
            display: block;
            color: var(--color-text-muted);
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            padding: 32px 20px;
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            position: relative;
            transition: all var(--transition);
        }
        .process-step:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .process-step .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .process-step:nth-child(2) .step-number { background: var(--color-accent); }
        .process-step:nth-child(3) .step-number { background: var(--color-success); }
        .process-step:nth-child(4) .step-number { background: #8b5cf6; }
        .process-step h4 { font-size: 1.05rem; margin-bottom: 8px; }
        .process-step p { font-size: 0.9rem; color: var(--color-text-soft); margin-bottom: 0; }
        .process-step .step-arrow {
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.2rem;
            color: var(--color-text-muted);
        }
        .process-step:last-child .step-arrow { display: none; }

        /* ===== Testimonials / Trust ===== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .testimonial-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: all var(--transition);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .testimonial-card .stars {
            color: var(--color-accent);
            font-size: 0.95rem;
            margin-bottom: 14px;
            letter-spacing: 2px;
        }
        .testimonial-card blockquote {
            font-size: 0.95rem;
            color: var(--color-text-soft);
            line-height: 1.7;
            font-style: normal;
            margin-bottom: 18px;
            quotes: none;
        }
        .testimonial-card blockquote::before {
            content: '“';
            font-size: 2rem;
            color: var(--color-primary-light);
            font-weight: 700;
            line-height: 0;
            vertical-align: -0.4em;
            margin-right: 4px;
        }
        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .author img {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            object-fit: cover;
            background: var(--color-bg-alt);
        }
        .testimonial-card .author .name {
            font-weight: 600;
            font-size: 0.9rem;
        }
        .testimonial-card .author .role {
            font-size: 0.8rem;
            color: var(--color-text-muted);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--color-primary-light);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: var(--color-bg-alt);
            transition: background var(--transition);
            list-style: none;
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::marker { display: none; }
        .faq-item summary i {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item[open] summary {
            background: var(--color-primary-bg);
            border-bottom: 1px solid var(--color-border);
        }
        .faq-item[open] summary i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-item .faq-answer {
            padding: 20px 24px;
            font-size: 0.95rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }
        .faq-item .faq-answer p:last-child { margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 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.webp') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.25rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.85);
            font-size: 1.1rem;
            max-width: 580px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-primary {
            background: #fff;
            color: var(--color-primary-dark);
            box-shadow: 0 6px 20px rgba(0,0,0,0.15);
        }
        .cta-section .btn-primary:hover {
            background: var(--color-accent);
            color: #1e293b;
            box-shadow: 0 8px 28px rgba(245,158,11,0.35);
        }
        .cta-section .btn-outline-light {
            border-color: rgba(255,255,255,0.5);
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 60px 0 32px;
        }
        .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);
            margin-bottom: 32px;
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand .footer-logo i {
            color: var(--color-primary-light);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--color-footer-link);
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--color-footer-link);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-col ul li a i {
            margin-right: 6px;
            font-size: 0.75rem;
            color: var(--color-primary-light);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 0.85rem;
            color: var(--color-footer-link);
        }
        .footer-bottom a {
            color: var(--color-footer-link);
        }
        .footer-bottom a:hover { color: #fff; }
        .footer-bottom .footer-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            h1 { font-size: 2.25rem; }
            h2 { font-size: 1.75rem; }
            .hero h1 { font-size: 2.5rem; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .news-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); }
            .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .header-search { width: 160px; }
            .header-nav { gap: 20px; }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            .section { padding: 56px 0; }
            h1 { font-size: 1.85rem; }
            h2 { font-size: 1.5rem; }
            .hero { min-height: 70vh; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-content { padding: 40px 0; }
            .hero-stats { gap: 24px; }
            .hero-stat-item .number { font-size: 1.4rem; }

            .header-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 24px 32px 32px;
                gap: 16px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
            }
            .header-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .header-nav a { font-size: 1.05rem; padding: 8px 0; }
            .header-nav a::after { display: none; }
            .header-actions .header-search { display: none; }
            .mobile-menu-toggle { display: flex; }
            .header-cta { padding: 8px 18px; font-size: 0.85rem; }
            .header-cta span { display: none; }

            .features-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-item { padding: 24px 12px; }
            .stat-item .stat-number { font-size: 1.8rem; }
            .process-grid { grid-template-columns: 1fr; }
            .process-step .step-arrow { display: none; }
            .testimonials-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.65rem; }
            .cta-section { padding: 56px 0; }
            .section-title { margin-bottom: 32px; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.7rem; }
            .hero p { font-size: 0.95rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline-light { width: 100%; justify-content: center; }
            .hero-stats { gap: 16px; flex-direction: column; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .header-inner { padding: 0 16px; }
            .news-card .news-body { padding: 18px; }
            .feature-card { padding: 28px 20px; }
            .testimonial-card { padding: 24px 20px; }
            .faq-item summary { padding: 14px 18px; font-size: 0.95rem; }
            .faq-item .faq-answer { padding: 14px 18px; }
        }

        /* ===== Scroll padding for anchor links ===== */
        .section-anchor { scroll-margin-top: calc(var(--header-height) + 16px); }

        /* ===== Focus & Accessibility ===== */
        .btn-primary:focus-visible,
        .btn-outline-light:focus-visible,
        .header-cta:focus-visible {
            outline: 3px solid var(--color-accent);
            outline-offset: 2px;
        }

        /* ===== Skeleton / Loading subtle ===== */
        @keyframes shimmer {
            0% { background-position: -200% 0; }
            100% { background-position: 200% 0; }
        }
        .skeleton {
            background: linear-gradient(90deg, var(--color-border-light) 25%, #e8ecf1 50%, var(--color-border-light) 75%);
            background-size: 200% 100%;
            animation: shimmer 1.5s infinite;
            border-radius: var(--radius-sm);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --color-primary: #1a56db;
            --color-primary-dark: #1243af;
            --color-primary-light: #e8f0fe;
            --color-secondary: #f59e0b;
            --color-secondary-dark: #d97706;
            --color-accent: #10b981;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-light: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-footer-bg: #0f172a;
            --color-footer-text: #cbd5e1;
            --color-footer-link: #94a3b8;
            --color-footer-heading: #f1f5f9;
            --color-white: #ffffff;
            --color-danger: #ef4444;
            --color-success: #22c55e;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 9999px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
        }
        a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--color-primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        input, button, textarea, select { font: inherit; color: inherit; }
        button { cursor: pointer; border: none; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.2rem; }
        p { margin-bottom: 1em; }
        p:last-child { margin-bottom: 0; }

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

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            height: var(--header-height);
            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: var(--header-height);
            gap: 24px;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .header-logo i { font-size: 1.6rem; color: var(--color-secondary); }
        .header-logo:hover { color: var(--color-primary); opacity: 0.9; }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }
        .header-nav a {
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-light);
            transition: all var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .header-nav a:hover {
            color: var(--color-primary);
            background: var(--color-primary-light);
        }
        .header-nav a.active {
            color: var(--color-white);
            background: var(--color-primary);
        }
        .header-nav a.active:hover {
            background: var(--color-primary-dark);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .header-search {
            display: flex;
            align-items: center;
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-full);
            padding: 0 16px;
            transition: all var(--transition);
        }
        .header-search:focus-within {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.12);
        }
        .header-search input {
            border: none;
            background: transparent;
            padding: 8px 0;
            width: 140px;
            font-size: 0.9rem;
            outline: none;
        }
        .header-search input::placeholder { color: var(--color-text-muted); }
        .header-search i { color: var(--color-text-muted); font-size: 0.95rem; }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            background: var(--color-primary);
            color: var(--color-white);
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            transition: all var(--transition);
        }
        .header-cta:hover {
            background: var(--color-primary-dark);
            color: var(--color-white);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .header-cta i { font-size: 0.85rem; }

        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--color-text);
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-toggle:hover { background: var(--color-bg-alt); }

        @media (max-width: 868px) {
            .header-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--color-border);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: var(--shadow-lg);
                align-items: stretch;
            }
            .header-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .header-nav a {
                padding: 12px 16px;
                border-radius: var(--radius-md);
                text-align: center;
            }
            .header-actions {
                flex-direction: column;
                width: 100%;
                gap: 8px;
                margin-top: 8px;
            }
            .header-search {
                width: 100%;
            }
            .header-search input { width: 100%; }
            .header-cta {
                justify-content: center;
                width: 100%;
            }
            .mobile-toggle { display: block; }
        }

        /* ===== Article Hero / Banner ===== */
        .article-hero {
            position: relative;
            margin-top: var(--header-height);
            padding: 80px 0 60px;
            background: var(--color-bg-dark);
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(15,23,42,0.60) 100%);
            z-index: 1;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: rgba(255,255,255,0.8);
            transition: color var(--transition);
        }
        .article-breadcrumb a:hover { color: var(--color-white); }
        .article-breadcrumb i { font-size: 0.7rem; color: rgba(255,255,255,0.4); }
        .article-breadcrumb span { color: var(--color-secondary); }
        .article-hero-title {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--color-white);
            line-height: 1.2;
            max-width: 860px;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .article-hero-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 24px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.75);
        }
        .article-hero-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-hero-meta .meta-item i { font-size: 0.85rem; }
        .article-hero-meta .category-tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--color-secondary);
            color: var(--color-white);
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .article-hero { padding: 60px 0 40px; min-height: 240px; }
            .article-hero-title { font-size: 1.8rem; }
            .article-hero-meta { gap: 12px 16px; font-size: 0.8rem; }
        }
        @media (max-width: 480px) {
            .article-hero-title { font-size: 1.5rem; }
            .article-hero { padding: 50px 0 32px; min-height: 200px; }
        }

        /* ===== Article Content ===== */
        .article-content-section {
            padding: 60px 0 40px;
            background: var(--color-bg);
        }
        .article-content-wrapper {
            max-width: 820px;
            margin: 0 auto;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
        }
        .article-body p {
            margin-bottom: 1.4em;
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--color-text);
        }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.3rem; }
        .article-body h4 { font-size: 1.1rem; }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.6em auto;
            box-shadow: var(--shadow-md);
        }
        .article-body ul,
        .article-body ol {
            margin: 1em 0;
            padding-left: 1.6em;
        }
        .article-body ul { list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body blockquote {
            border-left: 4px solid var(--color-primary);
            background: var(--color-primary-light);
            padding: 16px 24px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 1.6em 0;
            color: var(--color-text-light);
            font-style: italic;
        }
        .article-body a { color: var(--color-primary); text-decoration: underline; }
        .article-body a:hover { color: var(--color-primary-dark); }
        .article-body code {
            background: var(--color-bg-alt);
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            font-size: 0.9em;
            border: 1px solid var(--color-border);
        }
        .article-body pre {
            background: var(--color-bg-dark);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.6em 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-body pre code {
            background: transparent;
            padding: 0;
            border: none;
            color: inherit;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.6em 0;
            font-size: 0.95rem;
        }
        .article-body th,
        .article-body td {
            padding: 12px 16px;
            border: 1px solid var(--color-border);
            text-align: left;
        }
        .article-body th {
            background: var(--color-bg-alt);
            font-weight: 600;
        }
        .article-body tr:nth-child(even) td { background: var(--color-bg-alt); }

        /* ===== Article Footer ===== */
        .article-footer-bar {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--color-border);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .article-footer-bar .meta-info {
            font-size: 0.9rem;
            color: var(--color-text-light);
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-footer-bar .meta-info i { margin-right: 4px; }
        .article-footer-bar .share-links {
            display: flex;
            gap: 8px;
        }
        .article-footer-bar .share-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-full);
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            font-size: 1rem;
            transition: all var(--transition);
            border: 1px solid var(--color-border);
        }
        .article-footer-bar .share-links a:hover {
            background: var(--color-primary);
            color: var(--color-white);
            border-color: var(--color-primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* ===== Article Nav ===== */
        .article-nav-section {
            padding: 20px 0 40px;
            background: var(--color-bg);
        }
        .article-nav-links {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .article-nav-links a {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border);
            color: var(--color-text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            max-width: 48%;
        }
        .article-nav-links a:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .article-nav-links a i { font-size: 0.85rem; }
        .article-nav-links .nav-back {
            margin: 0 auto;
            max-width: 200px;
        }

        /* ===== CTA Section ===== */
        .article-cta-section {
            padding: 60px 0;
            background: var(--color-bg-alt);
        }
        .article-cta-box {
            background: var(--color-bg-dark);
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .article-cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.65) 100%);
            z-index: 1;
        }
        .article-cta-box > * {
            position: relative;
            z-index: 2;
        }
        .article-cta-box h3 {
            font-size: 1.8rem;
            color: var(--color-white);
            margin-bottom: 12px;
        }
        .article-cta-box p {
            font-size: 1.05rem;
            color: rgba(255,255,255,0.8);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .article-cta-box .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: var(--color-secondary);
            color: var(--color-white);
            border-radius: var(--radius-full);
            font-size: 1rem;
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-cta-box .cta-btn:hover {
            background: var(--color-secondary-dark);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.35);
        }

        @media (max-width: 768px) {
            .article-cta-box { padding: 40px 24px; }
            .article-cta-box h3 { font-size: 1.4rem; }
        }

        /* ===== Not Found State ===== */
        .not-found-section {
            padding: 80px 0;
            text-align: center;
            min-height: 50vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .not-found-box {
            max-width: 480px;
            margin: 0 auto;
        }
        .not-found-box i {
            font-size: 3.5rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 1.6rem;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--color-text-light);
            margin-bottom: 24px;
        }
        .not-found-box .back-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--color-primary);
            color: var(--color-white);
            border-radius: var(--radius-full);
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .back-btn:hover {
            background: var(--color-primary-dark);
            color: var(--color-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 60px 0 0;
        }
        .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);
        }
        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--color-white);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .footer-brand .footer-logo i { color: var(--color-secondary); font-size: 1.5rem; }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: var(--color-footer-text);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-footer-heading);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: var(--color-footer-link);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }
        .footer-col ul li a:hover { color: var(--color-white); padding-left: 4px; }
        .footer-col ul li a i { font-size: 0.65rem; }
        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 0.85rem;
            color: var(--color-footer-link);
            border-top: 1px solid rgba(255,255,255,0.06);
            margin-top: 0;
        }
        .footer-bottom a { color: var(--color-footer-link); }
        .footer-bottom a:hover { color: var(--color-white); }

        @media (max-width: 868px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 540px) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-brand { text-align: center; }
            .footer-brand .footer-logo { justify-content: center; }
            .footer-col { text-align: center; }
            .footer-col ul li a { justify-content: center; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-20 { margin-top: 20px; }
        .mb-20 { margin-bottom: 20px; }
        .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;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--color-bg-alt); }
        ::-webkit-scrollbar-thumb { background: var(--color-text-muted); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--color-text-light); }

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

        /* ===== Focus ===== */
        :focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 480px) {
            .article-body { font-size: 0.98rem; }
            .article-footer-bar { flex-direction: column; align-items: flex-start; }
            .article-nav-links a { max-width: 100%; width: 100%; justify-content: center; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --color-primary: #1a56db;
            --color-primary-dark: #1e40af;
            --color-primary-light: #dbeafe;
            --color-secondary: #059669;
            --color-secondary-light: #d1fae5;
            --color-accent: #f59e0b;
            --color-accent-light: #fef3c7;
            --color-bg: #ffffff;
            --color-bg-alt: #f0f9ff;
            --color-bg-warm: #fefce8;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-light: #64748b;
            --color-text-lighter: #94a3b8;
            --color-text-white: #ffffff;
            --color-border: #e2e8f0;
            --color-footer-bg: #0f172a;
            --color-footer-text: #94a3b8;
            --color-footer-link: #cbd5e1;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-error: #ef4444;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.16);
            --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, 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-family);
            font-size: 16px;
            line-height: 1.6;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding { padding: 80px 0; }
        .text-center { text-align: center; }
        .section-subtitle {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--color-text);
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 18px;
            color: var(--color-text-light);
            max-width: 680px;
            margin: 0 auto 40px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section-padding { padding: 56px 0; }
            .section-title { font-size: 28px; }
            .section-desc { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            height: var(--header-height);
            transition: var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--color-primary);
            flex-shrink: 0;
        }
        .header-logo i { font-size: 26px; color: var(--color-secondary); }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .header-nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text-light);
            padding: 6px 0;
            position: relative;
            transition: var(--transition);
        }
        .header-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .header-nav a:hover { color: var(--color-primary); }
        .header-nav a:hover::after { width: 100%; }
        .header-nav a.active {
            color: var(--color-primary);
            font-weight: 600;
        }
        .header-nav a.active::after { width: 100%; }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .header-search {
            position: relative;
            display: flex;
            align-items: center;
        }
        .header-search input {
            width: 180px;
            padding: 8px 16px 8px 36px;
            border: 1px solid var(--color-border);
            border-radius: 20px;
            background: var(--color-bg-alt);
            font-size: 14px;
            color: var(--color-text);
            transition: var(--transition);
        }
        .header-search input:focus {
            width: 220px;
            border-color: var(--color-primary);
            background: var(--color-bg);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.12);
        }
        .header-search input::placeholder { color: var(--color-text-lighter); }
        .header-search i {
            position: absolute;
            left: 12px;
            color: var(--color-text-light);
            font-size: 14px;
            pointer-events: none;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            white-space: nowrap;
        }
        .header-cta:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(26,86,219,0.35);
        }
        .header-cta i { font-size: 14px; }
        .menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
        .menu-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text); 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); }

        @media (max-width: 900px) {
            .header-nav { display: none; position: absolute; top: var(--header-height); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); flex-direction: column; padding: 20px 24px; gap: 16px; border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-lg); }
            .header-nav.open { display: flex; }
            .header-nav a { font-size: 16px; padding: 8px 0; }
            .header-search input { width: 140px; }
            .header-search input:focus { width: 160px; }
            .header-cta span { display: none; }
            .menu-toggle { display: flex; }
        }
        @media (max-width: 520px) {
            .header-logo { font-size: 18px; }
            .header-logo i { font-size: 20px; }
            .header-search input { width: 100px; padding: 6px 12px 6px 30px; font-size: 13px; }
            .header-search input:focus { width: 120px; }
            .header-search i { left: 10px; font-size: 12px; }
            .header-cta { padding: 6px 14px; font-size: 13px; }
        }

        /* ===== Hero ===== */
        .hero-category {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            margin-top: var(--header-height);
            background: linear-gradient(135deg, rgba(15,23,42,0.82), rgba(26,86,219,0.72)), url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            overflow: hidden;
        }
        .hero-category::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--color-bg), transparent);
        }
        .hero-category .container { position: relative; z-index: 2; width: 100%; }
        .hero-category-content { max-width: 720px; }
        .hero-category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.25);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            color: #fff;
            margin-bottom: 20px;
        }
        .hero-category-badge i { font-size: 14px; color: var(--color-accent); }
        .hero-category h1 {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .hero-category h1 span { color: var(--color-accent); }
        .hero-category p {
            font-size: 20px;
            color: rgba(255,255,255,0.85);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 600px;
        }
        .hero-category-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .hero-category-actions .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: linear-gradient(135deg, var(--color-accent), #d97706);
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
        }
        .hero-category-actions .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.4);
        }
        .hero-category-actions .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border: 2px solid rgba(255,255,255,0.6);
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
        }
        .hero-category-actions .btn-outline:hover {
            border-color: #fff;
            background: rgba(255,255,255,0.1);
        }
        @media (max-width: 768px) {
            .hero-category { min-height: 400px; }
            .hero-category h1 { font-size: 32px; }
            .hero-category p { font-size: 17px; }
            .hero-category-actions .btn-primary,
            .hero-category-actions .btn-outline { padding: 12px 24px; font-size: 15px; }
        }
        @media (max-width: 520px) {
            .hero-category { min-height: 340px; }
            .hero-category h1 { font-size: 26px; }
            .hero-category p { font-size: 15px; }
        }

        /* ===== Service Cards ===== */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .service-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 36px 28px 32px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
            transform: scaleX(0);
            transform-origin: left;
            transition: var(--transition);
        }
        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .service-card:hover::before { transform: scaleX(1); }
        .service-card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 20px;
        }
        .service-card-icon.blue { background: var(--color-primary-light); color: var(--color-primary); }
        .service-card-icon.green { background: var(--color-secondary-light); color: var(--color-secondary); }
        .service-card-icon.amber { background: var(--color-accent-light); color: var(--color-accent); }
        .service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
        .service-card p { font-size: 15px; color: var(--color-text-light); line-height: 1.7; }
        .service-card .tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
        .service-card .tag-list span {
            font-size: 12px;
            padding: 2px 12px;
            border-radius: 12px;
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            border: 1px solid var(--color-border);
        }
        @media (max-width: 900px) {
            .services-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 560px) {
            .services-grid { grid-template-columns: 1fr; }
            .service-card { padding: 28px 20px 24px; }
        }

        /* ===== Scenarios ===== */
        .bg-alt { background: var(--color-bg-alt); }
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .scenario-card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--color-border);
            transition: var(--transition);
        }
        .scenario-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .scenario-card-img {
            height: 160px;
            background: var(--color-bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .scenario-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .scenario-card:hover .scenario-card-img img { transform: scale(1.05); }
        .scenario-card-body { padding: 18px 20px 22px; }
        .scenario-card-body h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
        .scenario-card-body p { font-size: 14px; color: var(--color-text-light); line-height: 1.6; }
        @media (max-width: 900px) {
            .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .scenarios-grid { grid-template-columns: 1fr; }
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
            opacity: 0.3;
        }
        .process-step {
            text-align: center;
            position: relative;
        }
        .process-step-number {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #fff;
            font-size: 28px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            position: relative;
            z-index: 2;
            box-shadow: 0 4px 16px rgba(26,86,219,0.3);
        }
        .process-step:nth-child(2) .process-step-number { background: linear-gradient(135deg, var(--color-secondary), #047857); }
        .process-step:nth-child(3) .process-step-number { background: linear-gradient(135deg, var(--color-accent), #d97706); }
        .process-step:nth-child(4) .process-step-number { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
        .process-step h4 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
        .process-step p { font-size: 14px; color: var(--color-text-light); line-height: 1.6; max-width: 200px; margin: 0 auto; }
        @media (max-width: 900px) {
            .process-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 24px; }
            .process-grid::before { display: none; }
        }
        @media (max-width: 520px) {
            .process-grid { grid-template-columns: 1fr; gap: 28px; }
            .process-step p { max-width: 100%; }
        }

        /* ===== Expert / Team Cards ===== */
        .experts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .expert-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
        }
        .expert-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .expert-card-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--color-bg-alt);
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            color: var(--color-primary);
            border: 3px solid var(--color-primary-light);
            overflow: hidden;
        }
        .expert-card-avatar img { width: 100%; height: 100%; object-fit: cover; }
        .expert-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
        .expert-card .expert-title { font-size: 14px; color: var(--color-primary); font-weight: 500; margin-bottom: 12px; }
        .expert-card p { font-size: 14px; color: var(--color-text-light); line-height: 1.7; }
        @media (max-width: 900px) {
            .experts-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 560px) {
            .experts-grid { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--color-primary-light); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            background: var(--color-bg);
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question i { color: var(--color-primary); font-size: 18px; transition: var(--transition); flex-shrink: 0; }
        .faq-item.active .faq-question { background: var(--color-bg-alt); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            background: var(--color-bg);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p { font-size: 15px; color: var(--color-text-light); line-height: 1.7; }
        @media (max-width: 520px) {
            .faq-question { padding: 14px 16px; font-size: 15px; }
            .faq-item.active .faq-answer { padding: 0 16px 16px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
            animation: ctaGlow 15s ease-in-out infinite alternate;
        }
        @keyframes ctaGlow { 0% { transform: translate(0,0); } 100% { transform: translate(10%,10%); } }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 16px; }
        .cta-section p { font-size: 18px; color: rgba(255,255,255,0.85); max-width: 600px; margin: 0 auto 32px; }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: #fff;
            color: var(--color-primary);
            font-size: 18px;
            font-weight: 700;
            border-radius: 30px;
            transition: var(--transition);
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0,0,0,0.2);
        }
        @media (max-width: 768px) {
            .cta-section { padding: 56px 0; }
            .cta-section h2 { font-size: 28px; }
            .cta-section p { font-size: 16px; }
            .cta-section .btn-cta { padding: 14px 28px; font-size: 16px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-logo i { color: var(--color-secondary); }
        .footer-brand p { font-size: 14px; line-height: 1.8; max-width: 320px; }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--color-footer-link);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .footer-col ul li a i { font-size: 10px; color: var(--color-text-lighter); }
        .footer-col ul li a:hover { color: #fff; }
        .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: 13px;
        }
        .footer-bottom a { color: var(--color-footer-link); }
        .footer-bottom a:hover { color: #fff; }
        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 560px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Utility ===== */
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        .fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .fade-in.visible { opacity: 1; transform: translateY(0); }

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

        /* ===== Mobile menu overlay ===== */
        .nav-overlay {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.3);
            z-index: 999;
        }
        .nav-overlay.open { display: block; }
        @media (min-width: 901px) { .nav-overlay { display: none !important; } }