/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --secondary: #ED8936;
            --secondary-hover: #F6AD55;
            --success: #38A169;
            --success-light: #E6FFFA;
            --bg: #F7FAFC;
            --bg-card: #FFFFFF;
            --text: #1A202C;
            --text-light: #4A5568;
            --text-muted: #718096;
            --border: #E2E8F0;
            --border-light: #CBD5E0;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
            --shadow-xl: 0 10px 40px rgba(0,0,0,0.2);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition: 0.3s ease;
            --max-width: 1200px;
            --header-height: 64px;
        }

        /* ===== 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-stack);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        button { cursor: pointer; font-family: var(--font-stack); border: none; background: none; }
        button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        input, textarea { font-family: var(--font-stack); font-size: 16px; }
        ul { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

        /* ===== Section Spacing ===== */
        .section { padding: 80px 0; }
        .section-title { font-size: 32px; text-align: center; margin-bottom: 16px; }
        .section-subtitle { font-size: 18px; color: var(--text-light); text-align: center; max-width: 640px; margin: 0 auto 48px; }
        @media (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-title { font-size: 26px; }
            .section-subtitle { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: var(--primary);
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
            transition: background var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            user-select: none;
        }
        .logo i { font-size: 26px; color: var(--secondary); }
        .logo span { color: #fff; }
        .nav { display: flex; align-items: center; gap: 8px; height: 100%; }
        .nav > li { position: relative; height: 100%; display: flex; align-items: center; }
        .nav > li > a {
            display: flex;
            align-items: center;
            height: 100%;
            padding: 0 18px;
            color: rgba(255,255,255,0.9);
            font-size: 15px;
            font-weight: 500;
            border-radius: 0;
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .nav > li > a:hover,
        .nav > li > a:focus-visible { background: rgba(255,255,255,0.12); color: #fff; }
        .nav > li > a.active {
            color: #fff;
        }
        .nav > li > a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 18px;
            right: 18px;
            height: 3px;
            background: var(--secondary);
            border-radius: 2px 2px 0 0;
        }
        .nav-cta {
            background: var(--secondary) !important;
            color: #fff !important;
            padding: 0 22px !important;
            border-radius: var(--radius-md) !important;
            margin-left: 8px;
            font-weight: 600;
        }
        .nav-cta:hover { background: var(--secondary-hover) !important; }
        .mega-trigger {
            cursor: pointer;
        }
        .mega-panel {
            position: absolute;
            top: var(--header-height);
            left: 50%;
            transform: translateX(-50%) translateY(-8px);
            width: 680px;
            max-width: 90vw;
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            padding: 28px 32px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
            pointer-events: none;
            z-index: 999;
        }
        .nav > li:hover .mega-panel,
        .nav > li:focus-within .mega-panel {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
            pointer-events: auto;
        }
        .mega-panel::before {
            content: '';
            position: absolute;
            top: -8px;
            left: 50%;
            transform: translateX(-50%);
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-bottom: 10px solid #fff;
        }
        .mega-col { display: flex; flex-direction: column; gap: 16px; }
        .mega-col-title { font-size: 14px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
        .mega-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-md);
            transition: background var(--transition);
            color: var(--text);
        }
        .mega-item:hover { background: var(--primary-light); color: var(--primary); }
        .mega-item i { font-size: 20px; color: var(--primary); width: 24px; text-align: center; }
        .mega-item .mega-text { font-size: 14px; font-weight: 500; }
        .mega-item .mega-desc { font-size: 12px; color: var(--text-muted); font-weight: 400; }
        .mega-contact {
            grid-column: 1 / -1;
            background: var(--primary-light);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .mega-contact span { font-size: 14px; color: var(--text); font-weight: 500; }
        .mega-contact a {
            background: var(--primary);
            color: #fff;
            padding: 8px 20px;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition);
        }
        .mega-contact a:hover { background: var(--primary-dark); color: #fff; }

        /* Hamburger */
        .hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
        .hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            height: calc(100vh - var(--header-height));
            background: var(--primary-dark);
            z-index: 999;
            flex-direction: column;
            padding: 24px 20px;
            gap: 8px;
            overflow-y: auto;
            opacity: 0;
            transform: translateY(-12px);
            transition: opacity 0.3s ease, transform 0.3s ease;
            pointer-events: none;
        }
        .mobile-menu.open { display: flex; opacity: 1; transform: translateY(0); pointer-events: auto; }
        .mobile-menu a {
            display: block;
            padding: 14px 16px;
            color: rgba(255,255,255,0.9);
            font-size: 17px;
            font-weight: 500;
            border-radius: var(--radius-md);
            transition: background var(--transition);
        }
        .mobile-menu a:hover { background: rgba(255,255,255,0.1); }
        .mobile-menu a.active { background: rgba(255,255,255,0.12); color: var(--secondary); }
        .mobile-menu .mobile-cta { background: var(--secondary); color: #fff; text-align: center; margin-top: 16px; }
        .mobile-menu .mobile-cta:hover { background: var(--secondary-hover); }

        @media (max-width: 768px) {
            .nav { display: none; }
            .hamburger { display: flex; }
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            padding-top: var(--header-height);
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26,54,93,0.75) 0%, rgba(43,108,176,0.55) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; width: 100%; }
        .hero-content { max-width: 720px; padding: 60px 0; }
        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero .hero-sub {
            font-size: 22px;
            color: rgba(255,255,255,0.9);
            line-height: 1.5;
            margin-bottom: 36px;
            font-weight: 400;
        }
        .hero .hero-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--secondary), #DD6B20);
            color: #fff;
            padding: 16px 40px;
            border-radius: var(--radius-md);
            font-size: 18px;
            font-weight: 700;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 16px rgba(237,137,54,0.4);
        }
        .hero .hero-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(237,137,54,0.5);
            color: #fff;
        }
        .hero .hero-cta:active { transform: scale(0.98); }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .hero-stats .stat-item { display: flex; flex-direction: column; }
        .hero-stats .stat-num { font-size: 36px; font-weight: 800; color: var(--secondary); line-height: 1; }
        .hero-stats .stat-label { font-size: 14px; color: rgba(255,255,255,0.8); margin-top: 4px; }
        @media (max-width: 768px) {
            .hero { min-height: 80vh; }
            .hero h1 { font-size: 32px; }
            .hero .hero-sub { font-size: 18px; }
            .hero .hero-cta { padding: 14px 28px; font-size: 16px; }
            .hero-stats { gap: 24px; }
            .hero-stats .stat-num { font-size: 28px; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 26px; }
            .hero .hero-sub { font-size: 16px; }
            .hero-stats { flex-direction: column; gap: 16px; }
        }

        /* ===== Solution Cards ===== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card-solution {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 32px 24px 28px;
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
            border: 1px solid transparent;
        }
        .card-solution:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .card-solution .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--primary);
            font-size: 26px;
            transition: background var(--transition), color var(--transition);
        }
        .card-solution:hover .card-icon { background: var(--primary); color: #fff; }
        .card-solution h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
        .card-solution p { font-size: 15px; color: var(--text-light); line-height: 1.6; flex: 1; margin-bottom: 16px; }
        .card-solution .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .card-solution .card-link:hover { gap: 12px; color: var(--primary-dark); }
        @media (max-width: 1024px) {
            .cards-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .cards-grid { grid-template-columns: 1fr; }
        }

        /* ===== Stats / Data ===== */
        .stats-section {
            background: var(--success-light);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stats-grid .stat-item {}
        .stats-grid .stat-num { font-size: 48px; font-weight: 800; color: var(--success); line-height: 1; margin-bottom: 6px; }
        .stats-grid .stat-label { font-size: 16px; color: var(--text-light); font-weight: 500; }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
            .stats-grid .stat-num { font-size: 36px; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
        }

        /* ===== News / CMS List ===== */
        .news-section { background: var(--bg); }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 24px;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid var(--border);
        }
        .news-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
        .news-card .news-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 4px;
            margin-bottom: 12px;
            align-self: flex-start;
        }
        .news-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .news-card p { font-size: 14px; color: var(--text-light); line-height: 1.6; flex: 1; margin-bottom: 12px; }
        .news-card .news-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            padding-top: 12px;
        }
        .news-card .news-meta a { font-weight: 600; color: var(--primary); }
        .news-card .news-meta a:hover { color: var(--primary-dark); }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 20px;
            color: var(--text-muted);
            font-size: 16px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border);
        }
        @media (max-width: 768px) {
            .news-grid { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-section { background: var(--bg-card); }
        .faq-list { max-width: 800px; 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: border-color var(--transition);
        }
        .faq-item.open { border-color: var(--primary); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            background: var(--bg);
            font-size: 17px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover { background: var(--primary-light); }
        .faq-question i { font-size: 16px; color: var(--primary); transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            text-align: center;
        }
        .cta-section h2 { font-size: 34px; color: #fff; margin-bottom: 12px; }
        .cta-section p { font-size: 18px; color: rgba(255,255,255,0.85); max-width: 600px; margin: 0 auto 32px; }
        .cta-section .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--secondary);
            color: #fff;
            padding: 16px 44px;
            border-radius: var(--radius-md);
            font-size: 18px;
            font-weight: 700;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 16px rgba(237,137,54,0.35);
        }
        .cta-section .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(237,137,54,0.5); color: #fff; }
        .cta-section .cta-btn:active { transform: scale(0.98); }
        @media (max-width: 768px) {
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 16px; }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.8);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { font-size: 20px; margin-bottom: 12px; }
        .footer-brand p { font-size: 14px; line-height: 1.7; max-width: 300px; }
        .footer-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.7); transition: color var(--transition); }
        .footer-col ul a:hover { color: var(--secondary); }
        .footer-contact li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255,255,255,0.7); }
        .footer-contact li i { width: 18px; color: var(--secondary); }
        .footer-social { display: flex; gap: 12px; margin-top: 12px; }
        .footer-social a {
            width: 38px; height: 38px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
            transition: background var(--transition), transform var(--transition);
        }
        .footer-social a:hover { background: var(--secondary); transform: translateY(-2px); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--secondary); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Floating CTA & Modal ===== */
        .float-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 900;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }
        .float-btn {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-size: 26px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            transition: transform var(--transition), box-shadow var(--transition);
            border: none;
            cursor: pointer;
        }
        .float-btn:hover { transform: scale(1.08); box-shadow: var(--shadow-xl); }
        .float-btn:active { transform: scale(0.95); }
        .float-label {
            background: rgba(0,0,0,0.7);
            color: #fff;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: 12px;
            white-space: nowrap;
        }

        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 2000;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(4px);
            padding: 20px;
        }
        .modal-overlay.active { display: flex; }
        .modal {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 40px 36px 32px;
            width: 100%;
            max-width: 460px;
            box-shadow: var(--shadow-xl);
            position: relative;
            animation: modalIn 0.3s ease;
        }
        @keyframes modalIn {
            from { opacity: 0; transform: scale(0.95) translateY(20px); }
            to { opacity: 1; transform: scale(1) translateY(0); }
        }
        .modal .modal-close {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--bg);
            border: none;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text-muted);
            cursor: pointer;
            transition: background var(--transition), color var(--transition);
        }
        .modal .modal-close:hover { background: var(--border); color: var(--text); }
        .modal h2 { font-size: 24px; font-weight: 700; margin-bottom: 8px; text-align: center; }
        .modal .modal-desc { font-size: 14px; color: var(--text-muted); text-align: center; margin-bottom: 24px; }
        .modal .form-group { margin-bottom: 18px; }
        .modal .form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
        .modal .form-group input,
        .modal .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-input);
            font-size: 15px;
            transition: border-color var(--transition), box-shadow var(--transition);
            background: var(--bg);
        }
        .modal .form-group input:focus,
        .modal .form-group textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43,108,176,0.2);
        }
        .modal .form-group textarea { resize: vertical; min-height: 80px; }
        .modal .form-submit {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border: none;
            border-radius: var(--radius-md);
            font-size: 17px;
            font-weight: 700;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .modal .form-submit:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(43,108,176,0.35); }
        .modal .form-submit:active { transform: scale(0.98); }
        .modal .form-privacy {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 14px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .modal .form-privacy input { width: auto; accent-color: var(--primary); }
        .modal .form-privacy a { color: var(--primary); text-decoration: underline; }
        @media (max-width: 520px) {
            .modal { padding: 28px 20px 24px; }
            .float-cta { bottom: 16px; right: 16px; }
            .float-btn { width: 52px; height: 52px; font-size: 22px; }
        }

        /* ===== Breadcrumb (for inner pages) ===== */
        .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-muted); margin-bottom: 20px; flex-wrap: wrap; }
        .breadcrumb a { color: var(--primary); }
        .breadcrumb a:hover { color: var(--primary-dark); }
        .breadcrumb span { color: var(--text-muted); }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-8 { gap: 8px; }
        .gap-12 { gap: 12px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

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

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --accent: #ED8936;
            --accent-hover: #f59e40;
            --success: #38A169;
            --success-light: #E6FFFA;
            --bg: #F7FAFC;
            --bg-card: #ffffff;
            --bg-section: #EBF4FF;
            --text: #1A202C;
            --text-secondary: #4A5568;
            --text-light: #A0AEC0;
            --border: #E2E8F0;
            --border-focus: #2B6CB0;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --radius-badge: 4px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
            --shadow-modal: 0 10px 40px rgba(0,0,0,0.2);
            --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --header-h: 64px;
            --max-w: 1200px;
            --gap: 24px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary); text-decoration: none; transition: color 0.25s, opacity 0.25s; }
        a:hover { color: var(--primary-dark); }
        a:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
        img { max-width: 100%; height: auto; display: block; border-radius: 8px; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: 1rem; }
        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding-left: 16px;
            padding-right: 16px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: var(--primary);
            background: linear-gradient(135deg, #2B6CB0, #1A365D);
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 1px;
        }
        .logo i { font-size: 26px; color: var(--accent); }
        .logo:hover { color: #fff; opacity: 0.9; }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav > li { position: relative; }
        .nav > li > a {
            color: rgba(255,255,255,0.85);
            padding: 10px 16px;
            border-radius: 6px;
            font-size: 15px;
            font-weight: 500;
            transition: background 0.25s, color 0.25s;
            white-space: nowrap;
        }
        .nav > li > a:hover,
        .nav > li > a.active {
            background: rgba(255,255,255,0.12);
            color: #fff;
        }
        .nav > li > a.active { background: rgba(255,255,255,0.18); }
        .mega-trigger { position: relative; }
        .mega-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%) translateY(6px);
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-modal);
            padding: 28px 32px;
            min-width: 600px;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            z-index: 999;
            transition: opacity 0.3s, transform 0.3s;
            opacity: 0;
        }
        .mega-trigger:hover .mega-panel {
            display: grid;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }
        .mega-col-title {
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
            padding-bottom: 6px;
        }
        .mega-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 12px;
            border-radius: 8px;
            transition: background 0.2s;
            margin-bottom: 4px;
        }
        .mega-item:hover { background: var(--primary-light); }
        .mega-item i { font-size: 22px; color: var(--primary); margin-top: 2px; width: 28px; text-align: center; }
        .mega-text { font-size: 15px; font-weight: 600; color: var(--text); }
        .mega-desc { font-size: 13px; color: var(--text-secondary); }
        .hamburger { display: none; background: none; border: none; color: #fff; font-size: 28px; cursor: pointer; padding: 4px 8px; }

        /* ===== Mobile Nav ===== */
        .mobile-nav {
            display: none;
            position: fixed;
            top: var(--header-h);
            left: 0;
            width: 100%;
            height: calc(100vh - var(--header-h));
            background: var(--primary-dark);
            z-index: 999;
            padding: 24px 20px;
            overflow-y: auto;
            flex-direction: column;
            gap: 8px;
        }
        .mobile-nav.open { display: flex; }
        .mobile-nav a {
            color: rgba(255,255,255,0.85);
            padding: 14px 16px;
            border-radius: 8px;
            font-size: 17px;
            font-weight: 500;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .mobile-nav a:hover,
        .mobile-nav a.active { background: rgba(255,255,255,0.1); color: #fff; }
        .mobile-nav .mega-mobile-title { font-size: 13px; color: var(--accent); padding: 12px 16px 4px; font-weight: 600; letter-spacing: 1px; }

        /* ===== Article Banner ===== */
        .article-banner {
            padding-top: calc(var(--header-h) + 40px);
            padding-bottom: 40px;
            background: var(--primary);
            background: linear-gradient(135deg, #2B6CB0, #1A365D);
            color: #fff;
        }
        .article-banner .container { max-width: 860px; }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
        }
        .breadcrumb a { color: rgba(255,255,255,0.8); }
        .breadcrumb a:hover { color: #fff; }
        .breadcrumb .sep { opacity: 0.5; }
        .article-banner h1 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255,255,255,0.7);
        }
        .article-meta i { margin-right: 6px; color: var(--accent); }

        /* ===== Article Content ===== */
        .article-main {
            padding: 48px 0 60px;
            background: var(--bg);
        }
        .article-main .container { max-width: 860px; }
        .article-body {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 40px 48px;
            font-size: 17px;
            line-height: 1.8;
            color: var(--text);
        }
        .article-body h2 { font-size: 26px; margin: 36px 0 16px; color: var(--primary-dark); }
        .article-body h3 { font-size: 22px; margin: 28px 0 12px; color: var(--primary); }
        .article-body h4 { font-size: 18px; margin: 20px 0 10px; font-weight: 600; }
        .article-body p { margin-bottom: 18px; }
        .article-body img { margin: 24px auto; border-radius: 8px; box-shadow: var(--shadow-sm); }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 8px 8px 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 18px 24px;
        }
        .article-body ul li { list-style: disc; margin-bottom: 8px; }
        .article-body ol li { list-style: decimal; margin-bottom: 8px; }
        .article-body code {
            background: #EDF2F7;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
        }
        .article-body pre {
            background: #1A202C;
            color: #E2E8F0;
            padding: 20px 24px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 24px 0;
            font-size: 14px;
            line-height: 1.6;
        }
        .article-body a { font-weight: 500; text-decoration: underline; }
        .article-body .tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: var(--radius-badge);
            font-size: 13px;
            font-weight: 600;
            margin-right: 8px;
            margin-bottom: 8px;
        }
        .article-notfound {
            text-align: center;
            padding: 80px 20px;
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
        }
        .article-notfound i { font-size: 56px; color: var(--text-light); margin-bottom: 20px; }
        .article-notfound h2 { font-size: 24px; color: var(--text); margin-bottom: 12px; }
        .article-notfound p { color: var(--text-secondary); margin-bottom: 20px; }
        .article-notfound .btn { display: inline-block; }

        /* ===== Related Section ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-section);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 40px;
        }
        .related-section .section-title span { color: var(--primary); }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .related-card {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            transition: transform 0.25s, box-shadow 0.25s;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card .card-cat {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: var(--radius-badge);
            margin-bottom: 10px;
        }
        .related-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
        .related-card h3 a { color: var(--text); }
        .related-card h3 a:hover { color: var(--primary); }
        .related-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; line-height: 1.6; }
        .related-card .card-foot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--text-light);
        }
        .related-card .card-foot a { font-weight: 600; color: var(--primary); font-size: 14px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            font-size: 16px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s, background 0.25s;
            text-decoration: none;
        }
        .btn:active { transform: scale(0.97); }
        .btn-primary {
            background: linear-gradient(135deg, #2B6CB0, #1A365D);
            color: #fff;
            box-shadow: 0 4px 14px rgba(43,108,176,0.35);
        }
        .btn-primary:hover { background: linear-gradient(135deg, #3579c2, #1f4270); color: #fff; box-shadow: 0 6px 20px rgba(43,108,176,0.45); }
        .btn-accent {
            background: linear-gradient(135deg, #ED8936, #dd6b20);
            color: #fff;
            box-shadow: 0 4px 14px rgba(237,137,54,0.35);
        }
        .btn-accent:hover { background: linear-gradient(135deg, #f59e40, #e07a2a); color: #fff; box-shadow: 0 6px 20px rgba(237,137,54,0.45); }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 10px 26px;
        }
        .btn-outline:hover { background: var(--primary); color: #fff; }

        /* ===== Footer ===== */
        .footer {
            background: #1A202C;
            color: rgba(255,255,255,0.8);
            padding: 48px 0 0;
        }
        .footer .container { max-width: var(--max-w); }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; font-size: 20px; margin-bottom: 14px; }
        .footer-brand p { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 320px; }
        .footer-col h4 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 14px; }
        .footer-col ul li a:hover { color: #fff; }
        .footer-contact li { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
        .footer-contact i { color: var(--accent); width: 18px; text-align: center; }
        .footer-social { display: flex; gap: 14px; margin-top: 16px; }
        .footer-social a { color: rgba(255,255,255,0.5); font-size: 20px; transition: color 0.25s, transform 0.2s; }
        .footer-social a:hover { color: var(--accent); transform: scale(1.1); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== Modal ===== */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0,0,0,0.55);
            z-index: 2000;
            justify-content: center;
            align-items: center;
            padding: 20px;
            animation: fadeIn 0.3s;
        }
        .modal-overlay.open { display: flex; }
        .modal-box {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-modal);
            padding: 36px 40px;
            max-width: 440px;
            width: 100%;
            position: relative;
            animation: slideUp 0.35s ease;
        }
        .modal-close {
            position: absolute;
            top: 14px; right: 18px;
            background: none;
            border: none;
            font-size: 28px;
            color: var(--text-light);
            cursor: pointer;
            transition: color 0.2s;
            line-height: 1;
        }
        .modal-close:hover { color: var(--text); }
        .modal-box h2 { font-size: 24px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
        .modal-box .modal-sub { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
        .modal-box .form-group { margin-bottom: 16px; }
        .modal-box .form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
        .modal-box .form-group input,
        .modal-box .form-group textarea {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border);
            border-radius: var(--radius-input);
            font-size: 15px;
            transition: border 0.25s, box-shadow 0.25s;
            background: var(--bg);
        }
        .modal-box .form-group input:focus,
        .modal-box .form-group textarea:focus {
            outline: none;
            border-color: var(--border-focus);
            box-shadow: 0 0 0 3px rgba(43,108,176,0.2);
        }
        .modal-box .form-group textarea { min-height: 80px; resize: vertical; }
        .modal-box .form-privacy {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            color: var(--text-light);
            margin: 12px 0 18px;
        }
        .modal-box .form-privacy input[type="checkbox"] { width: auto; accent-color: var(--primary); }
        .modal-box .btn { width: 100%; justify-content: center; }

        /* ===== Float Button ===== */
        .float-consult {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 1500;
            background: linear-gradient(135deg, #ED8936, #dd6b20);
            color: #fff;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            box-shadow: 0 6px 24px rgba(237,137,54,0.45);
            cursor: pointer;
            border: none;
            transition: transform 0.25s, box-shadow 0.25s;
        }
        .float-consult:hover { transform: scale(1.06); box-shadow: 0 8px 32px rgba(237,137,54,0.55); color: #fff; }
        .float-consult .tooltip {
            position: absolute;
            right: 72px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--text);
            color: #fff;
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 14px;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s;
        }
        .float-consult:hover .tooltip { opacity: 1; }

        /* ===== Animations ===== */
        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
        @keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .nav { display: none; }
            .hamburger { display: flex; }
            .article-banner h1 { font-size: 26px; }
            .article-body { padding: 24px 20px; font-size: 15px; }
            .article-body h2 { font-size: 22px; }
            .article-body h3 { font-size: 18px; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .modal-box { padding: 28px 24px; }
            .float-consult { width: 52px; height: 52px; font-size: 22px; bottom: 20px; right: 20px; }
        }
        @media (max-width: 520px) {
            .article-banner h1 { font-size: 22px; }
            .article-meta { flex-direction: column; gap: 8px; }
            .article-body { padding: 18px 14px; }
            .modal-box { padding: 24px 18px; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2B6CB0;
            --primary-dark: #1A365D;
            --primary-light: #EBF4FF;
            --accent-orange: #ED8936;
            --accent-green: #38A169;
            --bg-body: #F7FAFC;
            --bg-card: #ffffff;
            --bg-light: #EBF4FF;
            --bg-green-light: #E6FFFA;
            --text-body: #1A202C;
            --text-muted: #718096;
            --text-white: #ffffff;
            --border: #E2E8F0;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
            --shadow-mega: 0 10px 30px rgba(0,0,0,0.1);
            --shadow-modal: 0 10px 40px rgba(0,0,0,0.2);
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --max-width: 1200px;
            --header-h: 64px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-stack);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            padding-top: var(--header-h);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; font-size: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: inherit; }
        ul { list-style: none; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 16px;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: var(--primary);
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 0.5px;
            text-decoration: none;
        }
        .logo i { font-size: 28px; color: var(--accent-orange); }
        .logo:hover { color: var(--text-white); opacity: 0.9; }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav > li > a {
            display: block;
            padding: 8px 18px;
            color: rgba(255,255,255,0.9);
            font-size: 15px;
            font-weight: 500;
            border-radius: 6px;
            transition: background 0.25s, color 0.25s;
            text-decoration: none;
        }
        .nav > li > a:hover,
        .nav > li > a:focus-visible {
            background: rgba(255,255,255,0.15);
            color: #fff;
        }
        .nav > li > a.active {
            background: rgba(255,255,255,0.22);
            color: #fff;
            font-weight: 600;
        }
        .mega-trigger { position: relative; }
        .mega-panel {
            display: none;
            position: absolute;
            top: calc(100% + 8px);
            left: 50%;
            transform: translateX(-50%);
            width: 640px;
            background: var(--bg-card);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-mega);
            padding: 24px;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }
        .mega-trigger:hover .mega-panel,
        .mega-trigger:focus-within .mega-panel {
            display: grid;
            opacity: 1;
        }
        .mega-col-title {
            font-size: 13px;
            font-weight: 700;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            border-bottom: 1px solid var(--border);
            padding-bottom: 6px;
        }
        .mega-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 12px;
            border-radius: 8px;
            transition: background 0.2s;
            color: var(--text-body);
            text-decoration: none;
        }
        .mega-item:hover { background: var(--primary-light); color: var(--primary-dark); }
        .mega-item i { font-size: 24px; color: var(--primary); width: 32px; text-align: center; }
        .mega-text { font-size: 15px; font-weight: 600; }
        .mega-desc { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
        .hamburger { display: none; font-size: 26px; color: #fff; background: none; border: none; cursor: pointer; padding: 6px; }
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 998;
        }
        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: 0; left: 0; bottom: 0;
            width: 280px;
            background: var(--primary-dark);
            z-index: 999;
            padding: 24px 20px;
            flex-direction: column;
            gap: 8px;
            overflow-y: auto;
        }
        .mobile-nav-panel a {
            display: block;
            padding: 12px 16px;
            color: rgba(255,255,255,0.9);
            font-size: 16px;
            font-weight: 500;
            border-radius: 8px;
            text-decoration: none;
            transition: background 0.2s;
        }
        .mobile-nav-panel a:hover { background: rgba(255,255,255,0.12); }
        .mobile-nav-panel a.active { background: rgba(255,255,255,0.2); font-weight: 700; }
        .mobile-close { align-self: flex-end; font-size: 28px; color: #fff; background: none; border: none; cursor: pointer; padding: 4px 8px; }

        /* ===== Hero ===== */
        .hero-cat {
            position: relative;
            min-height: 65vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            padding: 80px 0 60px;
        }
        .hero-cat::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.55);
        }
        .hero-cat .container { position: relative; z-index: 2; text-align: center; }
        .hero-cat h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-cat p {
            font-size: 20px;
            color: rgba(255,255,255,0.92);
            max-width: 680px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .hero-cat .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--accent-orange), #dd6b20);
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            border-radius: var(--radius-btn);
            transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
            box-shadow: 0 4px 14px rgba(237,137,54,0.35);
            text-decoration: none;
            border: none;
        }
        .btn-primary:hover { filter: brightness(1.08); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(237,137,54,0.45); color: #fff; }
        .btn-primary:active { transform: scale(0.97); }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 34px;
            background: transparent;
            color: var(--text-white);
            font-size: 17px;
            font-weight: 600;
            border: 2px solid rgba(255,255,255,0.7);
            border-radius: var(--radius-btn);
            transition: background 0.25s, border-color 0.25s;
            text-decoration: none;
        }
        .btn-outline-light:hover { background: rgba(255,255,255,0.15); border-color: #fff; color: #fff; }

        /* ===== Sections ===== */
        .section { padding: 80px 0; }
        .section-title {
            font-size: 32px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 16px;
            color: var(--text-body);
        }
        .section-sub {
            font-size: 18px;
            color: var(--text-muted);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        .section.bg-light { background: var(--primary-light); }
        .section.bg-green { background: var(--bg-green-light); }

        /* ===== Card Grid ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 32px 24px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 12px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 28px;
            color: var(--primary);
        }
        .card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
        .card p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-weight: 600;
            font-size: 15px;
            color: var(--primary);
            text-decoration: none;
            transition: gap 0.2s;
        }
        .card-link:hover { gap: 12px; color: var(--primary-dark); }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-number {
            font-size: 48px;
            font-weight: 800;
            color: var(--accent-green);
            line-height: 1.1;
        }
        .stat-label {
            font-size: 16px;
            color: var(--text-muted);
            margin-top: 6px;
        }

        /* ===== Scene / Flow ===== */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .scene-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px 24px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .scene-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
        .scene-card i { font-size: 40px; color: var(--accent-orange); margin-bottom: 16px; }
        .scene-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
        .scene-card p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }

        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .flow-step {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px 20px;
            text-align: center;
            position: relative;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .flow-step:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
        .flow-step::before {
            counter-increment: step;
            content: counter(step);
            display: block;
            width: 40px;
            height: 40px;
            line-height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            margin: 0 auto 14px;
        }
        .flow-step h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
        .flow-step p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 780px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--bg-card);
        }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 17px;
            font-weight: 600;
            background: none;
            border: none;
            text-align: left;
            color: var(--text-body);
            cursor: pointer;
            transition: background 0.2s;
        }
        .faq-question:hover { background: var(--primary-light); }
        .faq-question i { transition: transform 0.3s; font-size: 18px; color: var(--primary); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 400px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 16px;
            padding: 64px 48px;
            text-align: center;
            color: var(--text-white);
        }
        .cta-block h2 { font-size: 34px; font-weight: 700; margin-bottom: 16px; }
        .cta-block p { font-size: 18px; opacity: 0.9; max-width: 560px; margin: 0 auto 32px; line-height: 1.7; }
        .cta-block .btn-primary { background: linear-gradient(135deg, var(--accent-orange), #dd6b20); box-shadow: 0 4px 14px rgba(0,0,0,0.25); }

        /* ===== Footer ===== */
        .footer {
            background: #1A202C;
            color: rgba(255,255,255,0.85);
            padding: 48px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 12px; }
        .footer-brand p { font-size: 14px; line-height: 1.7; opacity: 0.75; max-width: 320px; }
        .footer-col h4 { font-size: 16px; font-weight: 700; margin-bottom: 16px; color: #fff; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: rgba(255,255,255,0.7); font-size: 14px; text-decoration: none; transition: color 0.2s; }
        .footer-col ul li a:hover { color: var(--accent-orange); }
        .footer-contact li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255,255,255,0.7); margin-bottom: 10px; }
        .footer-contact i { width: 18px; color: var(--accent-orange); }
        .footer-social { display: flex; gap: 12px; margin-top: 16px; }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            color: rgba(255,255,255,0.8);
            font-size: 20px;
            transition: background 0.2s, color 0.2s;
            text-decoration: none;
        }
        .footer-social a:hover { background: var(--accent-orange); color: #fff; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255,255,255,0.5);
            flex-wrap: wrap;
            gap: 8px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); text-decoration: none; }
        .footer-bottom a:hover { color: var(--accent-orange); }

        /* ===== Modal ===== */
        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.55);
            z-index: 2000;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        .modal-overlay.active { display: flex; }
        .modal-box {
            background: var(--bg-card);
            border-radius: 16px;
            max-width: 440px;
            width: 100%;
            padding: 36px 32px 28px;
            box-shadow: var(--shadow-modal);
            position: relative;
            max-height: 90vh;
            overflow-y: auto;
        }
        .modal-close {
            position: absolute;
            top: 12px;
            right: 16px;
            font-size: 28px;
            color: var(--text-muted);
            background: none;
            border: none;
            cursor: pointer;
            transition: color 0.2s;
        }
        .modal-close:hover { color: var(--text-body); }
        .modal-box h3 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
        .modal-box .modal-desc { font-size: 15px; color: var(--text-muted); margin-bottom: 24px; }
        .form-group { margin-bottom: 18px; }
        .form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text-body); }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #CBD5E0;
            border-radius: var(--radius-input);
            font-size: 15px;
            transition: border-color 0.2s, box-shadow 0.2s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43,108,176,0.2);
            outline: none;
        }
        .form-group textarea { resize: vertical; min-height: 80px; }
        .form-submit {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            border: none;
            border-radius: var(--radius-btn);
            transition: filter 0.2s, transform 0.2s;
        }
        .form-submit:hover { filter: brightness(1.1); transform: translateY(-1px); }
        .form-submit:active { transform: scale(0.98); }
        .form-privacy {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            margin-top: 14px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .form-privacy input { margin-top: 2px; accent-color: var(--primary); }
        .form-privacy a { color: var(--primary); text-decoration: underline; }

        /* ===== Floating CTA ===== */
        .float-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 500;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 24px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            border-radius: 50px;
            box-shadow: 0 6px 24px rgba(43,108,176,0.4);
            border: none;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            text-decoration: none;
        }
        .float-cta:hover { transform: translateY(-3px); box-shadow: 0 10px 32px rgba(43,108,176,0.5); color: #fff; }
        .float-cta i { font-size: 20px; }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            padding: 16px 0 8px;
            flex-wrap: wrap;
        }
        .breadcrumb a { color: var(--primary); text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { color: var(--text-muted); }
        .breadcrumb i { font-size: 12px; color: var(--text-muted); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .flow-steps { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .hero-cat h1 { font-size: 40px; }
        }
        @media (max-width: 768px) {
            .nav { display: none; }
            .hamburger { display: block; }
            .hero-cat { min-height: 50vh; padding: 60px 0 40px; }
            .hero-cat h1 { font-size: 32px; }
            .hero-cat p { font-size: 17px; }
            .section { padding: 48px 0; }
            .section-title { font-size: 26px; }
            .section-sub { font-size: 16px; margin-bottom: 32px; }
            .grid-3 { grid-template-columns: 1fr; gap: 20px; }
            .grid-4 { grid-template-columns: 1fr 1fr; gap: 16px; }
            .scene-grid { grid-template-columns: 1fr; gap: 20px; }
            .flow-steps { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
            .stat-number { font-size: 36px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-block { padding: 40px 24px; }
            .cta-block h2 { font-size: 26px; }
            .modal-box { padding: 28px 20px; }
            .float-cta { bottom: 16px; right: 16px; padding: 12px 18px; font-size: 14px; }
            .mega-panel { display: none !important; }
            .hero-cat .btn-group .btn-primary,
            .hero-cat .btn-group .btn-outline-light { width: 100%; justify-content: center; }
        }
        @media (max-width: 520px) {
            .grid-4 { grid-template-columns: 1fr; }
            .flow-steps { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .hero-cat h1 { font-size: 26px; }
            .hero-cat p { font-size: 15px; }
            .btn-primary, .btn-outline-light { padding: 12px 24px; font-size: 15px; }
            .section-title { font-size: 22px; }
            .card { padding: 24px 18px; }
        }