/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e40af;
            --primary-bg: #eff6ff;
            --secondary: #0d9488;
            --secondary-light: #14b8a6;
            --secondary-bg: #f0fdfa;
            --accent: #f59e0b;
            --accent-bg: #fffbeb;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-warm: #fdf8f3;
            --bg-dark: #0f172a;
            --text: #0f172a;
            --text-light: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --section-padding: 80px 0;
            --card-padding: 32px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

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

        button {
            cursor: pointer;
        }

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

        /* ===== Typography ===== */
        .heading-xl {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .heading-lg {
            font-size: 2.4rem;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }
        .heading-md {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.3;
        }
        .heading-sm {
            font-size: 1.25rem;
            font-weight: 600;
            line-height: 1.4;
        }
        .body-lg {
            font-size: 1.125rem;
            line-height: 1.8;
            color: var(--text-light);
        }
        .body-md {
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-light);
        }
        .body-sm {
            font-size: 0.875rem;
            line-height: 1.6;
            color: var(--text-muted);
        }
        .text-center {
            text-align: center;
        }
        .text-muted {
            color: var(--text-muted);
        }

        /* ===== Section ===== */
        .section {
            padding: var(--section-padding);
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-warm {
            background: var(--bg-warm);
        }
        .section-dark {
            background: var(--bg-dark);
            color: #fff;
        }
        .section-dark .body-lg,
        .section-dark .body-md {
            color: rgba(255, 255, 255, 0.8);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 100px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .section-label i {
            font-size: 0.75rem;
        }
        .section-title {
            margin-bottom: 16px;
        }
        .section-desc {
            max-width: 640px;
            margin: 0 auto 48px;
            text-align: center;
        }
        .section-desc-left {
            max-width: 640px;
            margin-bottom: 48px;
        }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
            transition: var(--transition);
        }
        .header.scrolled {
            box-shadow: var(--shadow);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            color: var(--text);
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            padding: 8px 20px;
            border-radius: 100px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
            position: relative;
        }
        .nav a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }

        .nav-cta {
            padding: 8px 24px !important;
            background: var(--primary) !important;
            color: #fff !important;
            border-radius: 100px !important;
            font-weight: 600 !important;
        }
        .nav-cta:hover {
            background: var(--primary-dark) !important;
            color: #fff !important;
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }

        /* Mobile menu toggle */
        .menu-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text);
            padding: 8px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            cursor: pointer;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: var(--border);
        }

        /* ===== Hero ===== */
        .hero {
            padding: 120px 0 80px;
            background: linear-gradient(135deg, var(--primary-bg) 0%, var(--bg) 50%, var(--secondary-bg) 100%);
            position: relative;
            overflow: hidden;
            min-height: 600px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.12;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg), transparent);
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content {
            max-width: 560px;
        }
        .hero-content .section-label {
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(8px);
        }
        .hero-content h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero-content h1 span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content p {
            font-size: 1.15rem;
            line-height: 1.8;
            color: var(--text-light);
            margin-bottom: 32px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-image {
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }
        .hero-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            max-width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 4/3;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        .hero-image::before {
            content: '';
            position: absolute;
            width: 80%;
            height: 80%;
            bottom: -10%;
            right: -5%;
            background: radial-gradient(circle, var(--secondary-light) 0%, transparent 70%);
            opacity: 0.2;
            border-radius: 50%;
            z-index: -1;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            border: 2px solid transparent;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-outline {
            background: transparent;
            color: var(--text);
            border-color: var(--border);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .btn-secondary {
            background: var(--secondary);
            color: #fff;
            border-color: var(--secondary);
        }
        .btn-secondary:hover {
            background: #0f766e;
            border-color: #0f766e;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.875rem;
        }
        .btn-lg {
            padding: 18px 40px;
            font-size: 1.1rem;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: var(--card-padding);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: #fff;
        }
        .card-icon.blue {
            background: var(--primary);
        }
        .card-icon.teal {
            background: var(--secondary);
        }
        .card-icon.amber {
            background: var(--accent);
        }
        .card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .card p {
            font-size: 0.95rem;
            line-height: 1.7;
            color: var(--text-light);
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
        }
        .card-link i {
            font-size: 0.75rem;
            transition: var(--transition);
        }
        .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Feature / Service Card ===== */
        .feature-card {
            text-align: center;
            padding: 40px 32px;
        }
        .feature-card .card-icon {
            margin: 0 auto 20px;
        }

        /* ===== Cover Card (分类入口) ===== */
        .cover-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            aspect-ratio: 16/9;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .cover-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .cover-card img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .cover-card:hover img {
            transform: scale(1.05);
        }
        .cover-card-overlay {
            position: relative;
            z-index: 2;
            padding: 28px 24px;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.75) 0%, transparent 100%);
            width: 100%;
            color: #fff;
        }
        .cover-card-overlay h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .cover-card-overlay p {
            font-size: 0.9rem;
            opacity: 0.85;
            margin-bottom: 8px;
        }
        .cover-card-overlay .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(4px);
            font-size: 0.75rem;
            font-weight: 500;
        }

        /* ===== Post / News Card ===== */
        .post-card {
            display: flex;
            gap: 24px;
            padding: 24px 0;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }
        .post-card:last-child {
            border-bottom: none;
        }
        .post-card:hover {
            padding-left: 8px;
        }
        .post-card-img {
            flex-shrink: 0;
            width: 180px;
            height: 120px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--bg-alt);
        }
        .post-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .post-card-body {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .post-card-body .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 100px;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 8px;
            align-self: flex-start;
        }
        .post-card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card-body h3 a {
            color: var(--text);
        }
        .post-card-body h3 a:hover {
            color: var(--primary);
        }
        .post-card-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 8px;
        }
        .post-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .post-card-meta i {
            margin-right: 4px;
        }

        /* ===== Grid Layouts ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: var(--radius);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.12);
            transform: translateY(-2px);
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
        }
        .stat-item.light .stat-number {
            color: var(--primary);
        }
        .stat-item.light .stat-label {
            color: var(--text-light);
        }
        .stat-item.light {
            background: var(--bg);
            border-color: var(--border);
        }
        .stat-item.light:hover {
            box-shadow: var(--shadow);
        }

        /* ===== Steps / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 15%;
            right: 15%;
            height: 2px;
            background: linear-gradient(to right, var(--primary), var(--secondary), var(--accent));
            opacity: 0.3;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 2;
        }
        .step-number {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 800;
            margin: 0 auto 20px;
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.25);
        }
        .step-item:nth-child(2) .step-number {
            background: var(--secondary);
            box-shadow: 0 8px 24px rgba(13, 148, 136, 0.25);
        }
        .step-item:nth-child(3) .step-number {
            background: var(--accent);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.25);
        }
        .step-item h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-light);
            max-width: 280px;
            margin: 0 auto;
        }

        /* ===== FAQ ===== */
        .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);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            background: var(--bg);
            transition: var(--transition);
            user-select: none;
        }
        .faq-question i {
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 0.9rem;
        }
        .faq-question.open i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.95rem;
            line-height: 1.7;
            color: var(--text-light);
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            text-align: center;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2.4rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            opacity: 0.9;
            margin-bottom: 32px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .btn {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
        }
        .cta-section .btn:hover {
            background: var(--bg-alt);
            border-color: var(--bg-alt);
            color: var(--primary-dark);
        }
        .cta-section .btn-outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.4);
        }
        .cta-section .btn-outline-light:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            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);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            display: block;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
            display: inline;
            padding: 0;
        }
        .footer-bottom a:hover {
            color: #fff;
            padding: 0;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            padding: 0;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            padding: 0;
            transform: translateY(-2px);
        }

        /* ===== Tags & Badges ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border);
        }
        .tag-primary {
            background: var(--primary-bg);
            color: var(--primary);
            border-color: transparent;
        }
        .tag-secondary {
            background: var(--secondary-bg);
            color: var(--secondary);
            border-color: transparent;
        }
        .tag-accent {
            background: var(--accent-bg);
            color: #b45309;
            border-color: transparent;
        }

        /* ===== Divider ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 4px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            margin: 0 auto 24px;
        }
        .divider-left {
            margin: 0 0 24px 0;
        }

        /* ===== Wave Decoration ===== */
        .wave-decoration {
            position: relative;
        }
        .wave-decoration::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 60px;
            background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60'%3E%3Cpath fill='%23ffffff' d='M0,30 C320,0 420,60 720,30 C1020,0 1120,60 1440,30 L1440,60 L0,60 Z'/%3E%3C/svg%3E") bottom center / cover no-repeat;
            pointer-events: none;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root {
                --section-padding: 60px 0;
            }
            .heading-xl {
                font-size: 2.6rem;
            }
            .heading-lg {
                font-size: 2rem;
            }
            .hero .container {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-content {
                max-width: 100%;
                text-align: center;
            }
            .hero-content h1 {
                font-size: 2.6rem;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-image {
                order: -1;
            }
            .hero-image img {
                max-width: 70%;
                margin: 0 auto;
            }
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .post-card-img {
                width: 140px;
                height: 100px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --section-padding: 48px 0;
                --card-padding: 24px;
            }
            .heading-xl {
                font-size: 2rem;
            }
            .heading-lg {
                font-size: 1.6rem;
            }
            .heading-md {
                font-size: 1.35rem;
            }
            .hero {
                padding: 100px 0 60px;
                min-height: auto;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .hero-content p {
                font-size: 1rem;
            }
            .hero-image img {
                max-width: 100%;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                z-index: 999;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                padding: 12px 20px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-cta {
                text-align: center;
                margin-top: 8px;
            }
            .menu-toggle {
                display: block;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-number {
                font-size: 2rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .post-card {
                flex-direction: column;
                gap: 16px;
            }
            .post-card-img {
                width: 100%;
                height: 180px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
            .section-desc {
                margin-bottom: 32px;
            }
            .hero-buttons .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .heading-xl {
                font-size: 1.7rem;
            }
            .hero-content h1 {
                font-size: 1.7rem;
            }
            .hero {
                padding: 90px 0 40px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .post-card-img {
                height: 140px;
            }
            .cover-card {
                aspect-ratio: 4/3;
            }
            .logo {
                font-size: 1.1rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
        }

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

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== Skeleton / Empty ===== */
        .empty-state {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            margin-bottom: 16px;
            display: block;
            opacity: 0.4;
        }
        .empty-state p {
            font-size: 1rem;
        }

        /* ===== Back to top ===== */
        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
            opacity: 0;
            pointer-events: none;
            z-index: 900;
            border: none;
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2D3A4A;
            --primary-light: #3E5066;
            --primary-dark: #1E2835;
            --accent: #E8A87C;
            --accent-light: #F0C4A0;
            --accent-dark: #D48A5A;
            --bg: #F7F5F2;
            --bg-alt: #EEEAE5;
            --bg-card: #FFFFFF;
            --text: #1A1A2E;
            --text-light: #6B7280;
            --text-muted: #9CA3AF;
            --border: #E5E0DB;
            --border-light: #F0EDE8;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(45, 58, 74, 0.08);
            --shadow-lg: 0 12px 48px rgba(45, 58, 74, 0.12);
            --shadow-hover: 0 20px 60px rgba(45, 58, 74, 0.15);
            --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --spacing-section: 100px;
            --spacing-block: 64px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: all var(--transition);
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
            padding: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--primary-dark);
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            margin-bottom: 16px;
        }
        h3 {
            font-size: clamp(1.3rem, 2.5vw, 1.8rem);
        }
        h4 {
            font-size: 1.2rem;
        }
        p {
            margin-bottom: 16px;
            color: var(--text-light);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-white {
            background: var(--bg-card);
        }
        .text-center {
            text-align: center;
        }
        .text-accent {
            color: var(--accent);
        }
        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent);
            background: rgba(232, 168, 124, 0.12);
            padding: 6px 18px;
            border-radius: 50px;
            margin-bottom: 20px;
        }
        .section-title {
            margin-bottom: 12px;
        }
        .section-sub {
            max-width: 640px;
            margin: 0 auto 48px auto;
            color: var(--text-light);
            font-size: 1.1rem;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: background var(--transition), box-shadow var(--transition);
        }
        .header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 32px rgba(45, 58, 74, 0.06);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            padding: 8px 20px;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a i {
            font-size: 0.9rem;
        }
        .nav a:hover {
            color: var(--primary);
            background: rgba(45, 58, 74, 0.06);
        }
        .nav a.active {
            color: var(--bg-card);
            background: var(--primary);
            box-shadow: 0 4px 16px rgba(45, 58, 74, 0.2);
        }
        .nav a.active:hover {
            background: var(--primary-light);
        }
        .nav a.nav-cta {
            background: var(--accent);
            color: var(--bg-card);
            font-weight: 600;
            padding: 8px 24px;
            box-shadow: 0 4px 16px rgba(232, 168, 124, 0.35);
        }
        .nav a.nav-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(232, 168, 124, 0.4);
        }
        .nav-toggle {
            display: none;
            background: none;
            font-size: 1.6rem;
            color: var(--primary);
            padding: 8px;
            border-radius: 8px;
        }
        .nav-toggle:hover {
            background: var(--bg-alt);
        }

        /* ===== Hero / Banner ===== */
        .hero {
            padding: calc(var(--header-height) + 60px) 0 80px 0;
            background: linear-gradient(165deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            min-height: 380px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 120px;
            background: var(--bg);
            clip-path: ellipse(70% 100% at 50% 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .hero h1 {
            color: #fff;
            margin-bottom: 16px;
            font-weight: 800;
            letter-spacing: -0.02em;
        }
        .hero p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.2rem;
            max-width: 640px;
            margin: 0 auto 32px auto;
            line-height: 1.6;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 8px 22px;
            border-radius: 50px;
            color: rgba(255, 255, 255, 0.9);
            font-size: 0.9rem;
            font-weight: 500;
            margin-bottom: 28px;
        }
        .hero-badge i {
            color: var(--accent);
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--bg-card);
            box-shadow: 0 4px 20px rgba(232, 168, 124, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(232, 168, 124, 0.4);
            color: #fff;
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.6);
            transform: translateY(-3px);
            color: #fff;
        }

        /* ===== Intro Section ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            background: var(--bg-alt);
            aspect-ratio: 4/3;
            position: relative;
        }
        .intro-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .intro-image .badge-float {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(10px);
            padding: 12px 20px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .intro-image .badge-float i {
            font-size: 1.8rem;
            color: var(--accent);
        }
        .intro-image .badge-float span {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--primary);
        }
        .intro-content h2 {
            margin-bottom: 20px;
        }
        .intro-content p {
            font-size: 1.05rem;
            margin-bottom: 20px;
        }
        .intro-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 32px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }
        .intro-stat {
            text-align: center;
        }
        .intro-stat .num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .intro-stat .label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== Guide Categories ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 28px;
        }
        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent-light);
        }
        .guide-card .card-img {
            height: 200px;
            background: var(--bg-alt);
            overflow: hidden;
            position: relative;
        }
        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .guide-card:hover .card-img img {
            transform: scale(1.05);
        }
        .guide-card .card-img .tag {
            position: absolute;
            top: 16px;
            left: 16px;
            background: var(--accent);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 50px;
            letter-spacing: 0.03em;
        }
        .guide-card .card-body {
            padding: 24px 24px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .guide-card .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--primary-dark);
        }
        .guide-card .card-body p {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-bottom: 16px;
            flex: 1;
        }
        .guide-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
            margin-top: auto;
        }
        .guide-card .card-body .card-meta i {
            margin-right: 4px;
        }
        .guide-card .card-body .card-link {
            color: var(--accent);
            font-weight: 600;
            font-size: 0.95rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .guide-card .card-body .card-link:hover {
            gap: 12px;
            color: var(--accent-dark);
        }

        /* ===== Featured Guides (list) ===== */
        .featured-list {
            display: grid;
            gap: 20px;
        }
        .featured-item {
            display: flex;
            align-items: stretch;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .featured-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateX(6px);
        }
        .featured-item .item-index {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 72px;
            min-width: 72px;
            background: var(--primary);
            color: #fff;
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
        }
        .featured-item .item-content {
            padding: 20px 28px;
            flex: 1;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }
        .featured-item .item-content .info h4 {
            font-size: 1.1rem;
            margin-bottom: 4px;
        }
        .featured-item .item-content .info p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
        }
        .featured-item .item-content .item-cta {
            color: var(--accent);
            font-weight: 600;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }
        .featured-item .item-content .item-cta:hover {
            gap: 12px;
            color: var(--accent-dark);
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            padding: 40px 24px 32px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .process-step:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .process-step::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -18px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: var(--accent);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(232, 168, 124, 0.3);
        }
        .process-step .icon {
            font-size: 2.4rem;
            color: var(--primary);
            margin-bottom: 20px;
            margin-top: 8px;
        }
        .process-step h4 {
            margin-bottom: 10px;
            color: var(--primary-dark);
        }
        .process-step p {
            font-size: 0.95rem;
            color: var(--text-light);
            margin: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: grid;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent-light);
        }
        .faq-item summary {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--primary-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            list-style: none;
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 1.2rem;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item[open] summary {
            background: var(--bg-alt);
        }
        .faq-item .answer {
            padding: 0 28px 24px 28px;
            color: var(--text-light);
            font-size: 0.98rem;
            line-height: 1.7;
        }
        .faq-item .answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-block .container {
            position: relative;
            z-index: 2;
        }
        .cta-block h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-block p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 32px auto;
            font-size: 1.1rem;
        }
        .cta-block .btn-primary {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
        }
        .cta-block .btn-primary:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(232, 168, 124, 0.4);
        }
        .cta-block .btn-outline-light {
            border-color: rgba(255, 255, 255, 0.4);
        }
        .cta-block .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.8);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 64px 0 32px;
        }
        .footer .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--accent);
        }
        .footer-brand .logo span {
            background: none;
            -webkit-text-fill-color: #fff;
            color: #fff;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.95rem;
            max-width: 360px;
            margin-bottom: 0;
        }
        .footer h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 32px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        .footer a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            padding: 5px 0;
            transition: all var(--transition);
        }
        .footer a:hover {
            color: var(--accent);
            padding-left: 6px;
        }
        .footer-social a {
            display: inline-flex !important;
            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, 0.7);
            font-size: 1.2rem;
            margin-right: 10px;
            padding: 0 !important;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-3px);
            padding-left: 0 !important;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            display: inline;
            color: rgba(255, 255, 255, 0.4);
            padding: 0;
        }
        .footer-bottom a:hover {
            color: var(--accent);
            padding-left: 0;
        }
        .footer-bottom i {
            margin-right: 4px;
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .intro-grid {
                gap: 40px;
            }
            .cta-block {
                padding: 48px 32px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 60px;
                --spacing-block: 40px;
                --header-height: 64px;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                transition: all var(--transition);
                pointer-events: none;
                border-radius: 0 0 var(--radius) var(--radius);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav a {
                width: 100%;
                padding: 12px 20px;
                border-radius: var(--radius-sm);
            }
            .nav a.nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
            .nav-toggle {
                display: block;
            }
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-image {
                order: -1;
            }
            .intro-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: 12px;
            }
            .intro-stat .num {
                font-size: 1.4rem;
            }
            .guide-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
                gap: 20px;
            }
            .featured-item {
                flex-direction: column;
            }
            .featured-item .item-index {
                width: 100%;
                min-width: unset;
                padding: 12px 0;
                font-size: 1.2rem;
            }
            .featured-item .item-content {
                padding: 16px 20px;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .hero {
                min-height: 320px;
                padding: calc(var(--header-height) + 40px) 0 60px;
            }
            .hero h1 {
                font-size: clamp(1.8rem, 6vw, 2.4rem);
            }
            .hero p {
                font-size: 1rem;
            }
            .cta-block {
                padding: 40px 24px;
                border-radius: var(--radius);
            }
            .cta-block .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section-sub {
                font-size: 1rem;
                margin-bottom: 32px;
            }
        }
        @media (max-width: 520px) {
            :root {
                --spacing-section: 48px;
            }
            .container {
                padding: 0 16px;
            }
            .guide-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .intro-stats {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 8px;
            }
            .intro-stat .num {
                font-size: 1.2rem;
            }
            .hero {
                min-height: 280px;
                padding: calc(var(--header-height) + 32px) 0 48px;
            }
            .hero-badge {
                font-size: 0.8rem;
                padding: 6px 16px;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .faq-item summary {
                padding: 16px 20px;
                font-size: 0.98rem;
            }
            .faq-item .answer {
                padding: 0 20px 18px 20px;
            }
            .cta-block {
                padding: 32px 16px;
            }
        }

/* roulang page: article */
:root {
  --primary: #6C3CF5;
  --primary-light: #8B5CF6;
  --primary-dark: #5A2DD0;
  --primary-bg: rgba(108, 60, 245, 0.08);
  --accent: #F59E0B;
  --accent-light: #FBBF24;
  --bg: #FAFAFE;
  --bg-alt: #F0EEFF;
  --bg-card: #FFFFFF;
  --text: #1A1A2E;
  --text-light: #6B7280;
  --text-muted: #9CA3AF;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(108, 60, 245, 0.10);
  --shadow-lg: 0 12px 48px rgba(108, 60, 245, 0.16);
  --shadow-hover: 0 16px 48px rgba(108, 60, 245, 0.20);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; font-size: 16px; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
button, input, textarea, select { font-family: inherit; font-size: inherit; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 800px; }

/* header / nav */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.88); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-light); transition: var(--transition); }
.header.scrolled { background: rgba(255,255,255,0.96); box-shadow: 0 2px 32px rgba(0,0,0,0.06); }
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); gap: 16px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 700; color: var(--text); }
.nav-logo i { font-size: 1.6rem; color: var(--primary); }
.nav-logo span { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-links a { display: flex; align-items: center; gap: 8px; padding: 8px 20px; border-radius: 100px; font-size: 0.92rem; font-weight: 500; color: var(--text-light); transition: var(--transition); }
.nav-links a i { font-size: 0.85rem; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: var(--primary-bg); }
.nav-links a.active { font-weight: 600; }
.nav-cta { background: var(--primary) !important; color: #fff !important; padding: 8px 24px !important; border-radius: 100px !important; font-weight: 600 !important; box-shadow: 0 4px 16px rgba(108,60,245,0.30); }
.nav-cta:hover { background: var(--primary-dark) !important; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,60,245,0.40) !important; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--text); cursor: pointer; padding: 8px; border-radius: var(--radius-xs); }
.nav-toggle:hover { background: var(--primary-bg); }

@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 16px 24px 24px; gap: 4px; border-bottom: 1px solid var(--border-light); box-shadow: 0 16px 48px rgba(0,0,0,0.08); }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; justify-content: center; padding: 12px 20px; }
  .nav-toggle { display: block; }
}

/* breadcrumb */
.breadcrumb { padding: 100px 0 20px; font-size: 0.88rem; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text-light); }
.breadcrumb i { margin: 0 6px; font-size: 0.7rem; }

/* article header */
.article-header { padding: 20px 0 32px; }
.article-category { display: inline-flex; align-items: center; gap: 6px; background: var(--primary-bg); color: var(--primary); padding: 6px 16px; border-radius: 100px; font-size: 0.82rem; font-weight: 600; margin-bottom: 20px; }
.article-category i { font-size: 0.75rem; }
.article-title { font-size: 2.4rem; font-weight: 800; line-height: 1.3; margin-bottom: 20px; color: var(--text); letter-spacing: -0.02em; }
.article-meta { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; color: var(--text-light); font-size: 0.9rem; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article-meta i { margin-right: 6px; color: var(--primary-light); }
.article-meta span { display: flex; align-items: center; }

/* article body */
.article-body { padding: 40px 0 60px; }
.article-content { font-size: 1.05rem; line-height: 1.9; color: var(--text); }
.article-content p { margin-bottom: 1.6em; }
.article-content h2 { font-size: 1.7rem; font-weight: 700; margin: 2em 0 0.8em; color: var(--text); }
.article-content h3 { font-size: 1.3rem; font-weight: 600; margin: 1.8em 0 0.6em; color: var(--text); }
.article-content ul, .article-content ol { margin-bottom: 1.6em; padding-left: 1.6em; }
.article-content li { margin-bottom: 0.5em; }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-content blockquote { border-left: 4px solid var(--primary); background: var(--primary-bg); padding: 16px 24px; margin: 1.6em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-light); font-style: italic; }
.article-content img { border-radius: var(--radius); margin: 2em 0; box-shadow: var(--shadow); }
.article-content code { background: var(--bg-alt); padding: 2px 8px; border-radius: var(--radius-xs); font-size: 0.9em; }

/* tags */
.article-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); }
.article-tags a { display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px; background: var(--bg-alt); color: var(--text-light); border-radius: 100px; font-size: 0.84rem; font-weight: 500; transition: var(--transition); }
.article-tags a:hover { background: var(--primary-bg); color: var(--primary); }

/* not found */
.not-found { text-align: center; padding: 120px 24px 80px; }
.not-found i { font-size: 4rem; color: var(--text-muted); margin-bottom: 24px; }
.not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
.not-found p { color: var(--text-light); margin-bottom: 24px; }
.not-found .btn { display: inline-flex; align-items: center; gap: 8px; }

/* btn */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 32px; border-radius: 100px; font-weight: 600; font-size: 0.95rem; transition: var(--transition); cursor: pointer; border: none; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 16px rgba(108,60,245,0.30); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-3px); box-shadow: 0 8px 32px rgba(108,60,245,0.40); color: #fff; }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); background: var(--primary-bg); transform: translateY(-2px); }
.btn-sm { padding: 8px 20px; font-size: 0.85rem; }

/* related section */
.related-section { padding: 60px 0; background: var(--bg-alt); }
.related-section .section-title { text-align: center; font-size: 1.8rem; font-weight: 700; margin-bottom: 40px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
.related-card-body { padding: 20px; }
.related-card-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.related-card-body h3 a { color: var(--text); }
.related-card-body h3 a:hover { color: var(--primary); }
.related-card-body .meta { font-size: 0.82rem; color: var(--text-muted); display: flex; gap: 16px; }
.related-card-body .meta i { margin-right: 4px; }

@media (max-width: 900px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .related-grid { grid-template-columns: 1fr; }
  .article-title { font-size: 1.6rem; }
  .article-meta { gap: 12px; font-size: 0.82rem; }
  .article-content { font-size: 0.98rem; }
}

/* footer */
.footer { background: var(--text); color: rgba(255,255,255,0.8); padding: 64px 0 32px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-brand .logo i { color: var(--accent); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 360px; }
.footer h4 { font-size: 0.95rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer a { display: block; color: rgba(255,255,255,0.6); font-size: 0.88rem; padding: 5px 0; transition: var(--transition); }
.footer a:hover { color: var(--accent); padding-left: 4px; }
.footer-social { display: flex; gap: 12px; }
.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(255,255,255,0.7); font-size: 1.1rem; padding: 0; }
.footer-social a:hover { background: var(--primary); color: #fff; padding: 0; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08); font-size: 0.84rem; color: rgba(255,255,255,0.4); flex-wrap: wrap; gap: 12px; }
.footer-bottom a { color: rgba(255,255,255,0.5); display: inline; padding: 0; }
.footer-bottom a:hover { color: var(--accent); padding: 0; }
.footer-bottom i { margin-right: 6px; }

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

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