/* roulang page: index */
/* ============================================
                   DESIGN VARIABLES
                   ============================================ */
        :root {
            --primary: #f59e0b;
            --primary-hover: #d97706;
            --primary-light: #fbbf24;
            --primary-glow: rgba(245, 158, 11, 0.25);
            --bg-deep: #070b14;
            --bg-dark: #0d1225;
            --bg-card: #111827;
            --bg-card-hover: #1a2332;
            --bg-elevated: #1e293b;
            --bg-overlay: rgba(7, 11, 20, 0.85);
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --text-inverse: #0f172a;
            --border-subtle: rgba(255, 255, 255, 0.06);
            --border-card: rgba(255, 255, 255, 0.08);
            --border-active: rgba(245, 158, 11, 0.4);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 40px rgba(245, 158, 11, 0.08);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --sidebar-width: 240px;
            --sidebar-collapsed: 72px;
            --header-height: 0px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ============================================
                   SCROLLBAR
                   ============================================ */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--bg-elevated);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ============================================
                   LAYOUT — SIDEBAR + MAIN
                   ============================================ */
        .app-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ---------- SIDEBAR ---------- */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-dark);
            border-right: 1px solid var(--border-subtle);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition), width var(--transition);
            overflow-y: auto;
            overflow-x: hidden;
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-subtle);
        }

        .sidebar-brand .brand-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--primary-hover));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--text-inverse);
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-brand .brand-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.3px;
            line-height: 1.3;
        }

        .sidebar-brand .brand-text span {
            color: var(--primary);
        }

        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: var(--text-muted);
            padding: 12px 12px 6px;
            font-weight: 600;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 10px 14px;
            border-radius: var(--radius-md);
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }

        .sidebar-nav a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }

        .sidebar-nav a.active {
            color: var(--primary);
            background: rgba(245, 158, 11, 0.08);
            border: 1px solid var(--border-active);
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--primary);
            border-radius: 0 4px 4px 0;
        }

        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid var(--border-subtle);
            font-size: 12px;
            color: var(--text-muted);
            text-align: center;
            line-height: 1.5;
        }

        .sidebar-footer a {
            color: var(--text-muted);
        }
        .sidebar-footer a:hover {
            color: var(--primary);
        }

        /* ---------- MAIN CONTENT ---------- */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            width: calc(100% - var(--sidebar-width));
        }

        /* ---------- MOBILE HEADER ---------- */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: var(--bg-dark);
            border-bottom: 1px solid var(--border-subtle);
            z-index: 999;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-header .brand-text {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
        }
        .mobile-header .brand-text span {
            color: var(--primary);
        }

        .mobile-header .hamburger {
            font-size: 24px;
            color: var(--text-primary);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-header .hamburger:hover {
            background: rgba(255, 255, 255, 0.05);
        }

        /* ---------- SIDEBAR OVERLAY (mobile) ---------- */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 998;
            backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .sidebar-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        /* ============================================
                   CONTAINER
                   ============================================ */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ============================================
                   SECTION SPACING
                   ============================================ */
        .section {
            padding: 80px 0;
        }
        .section-sm {
            padding: 48px 0;
        }
        .section-lg {
            padding: 120px 0;
        }

        /* ============================================
                   BUTTONS
                   ============================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            border: 1px solid transparent;
            cursor: pointer;
            text-align: center;
            line-height: 1.4;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--primary);
            color: var(--text-inverse);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            border-color: var(--primary-hover);
            color: var(--text-inverse);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px var(--primary-glow);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border-color: var(--border-card);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--text-muted);
            color: var(--text-primary);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }

        .btn-ghost {
            background: transparent;
            color: var(--text-secondary);
            padding: 10px 20px;
        }
        .btn-ghost:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }

        .btn-lg {
            padding: 16px 36px;
            font-size: 17px;
            border-radius: var(--radius-lg);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        /* ============================================
                   BADGE / TAG
                   ============================================ */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: rgba(245, 158, 11, 0.12);
            color: var(--primary-light);
            border: 1px solid rgba(245, 158, 11, 0.2);
        }
        .badge-neutral {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-secondary);
            border-color: var(--border-subtle);
        }

        /* ============================================
                   CARD
                   ============================================ */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-card);
            padding: 28px;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(255, 255, 255, 0.12);
            transform: translateY(-4px);
            box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5);
        }

        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: rgba(245, 158, 11, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 16px;
            border: 1px solid rgba(245, 158, 11, 0.15);
        }

        .card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .card p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }

        /* ============================================
                   GRID
                   ============================================ */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ============================================
                   SECTION TITLE
                   ============================================ */
        .section-title {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-title h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .section-title h2 .highlight {
            color: var(--primary);
        }
        .section-title p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ============================================
                   HERO
                   ============================================ */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            background: var(--bg-deep);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.3;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg,
                    rgba(7, 11, 20, 0.92) 0%,
                    rgba(7, 11, 20, 0.7) 50%,
                    rgba(7, 11, 20, 0.92) 100%);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            padding-top: 40px;
            padding-bottom: 40px;
        }

        .hero-content {
            max-width: 780px;
        }

        .hero-content .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(245, 158, 11, 0.1);
            border: 1px solid rgba(245, 158, 11, 0.2);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 13px;
            color: var(--primary-light);
            margin-bottom: 24px;
            font-weight: 500;
        }
        .hero-content .hero-badge i {
            font-size: 12px;
        }

        .hero-content h1 {
            font-size: 50px;
            font-weight: 900;
            line-height: 1.15;
            color: var(--text-primary);
            letter-spacing: -1px;
            margin-bottom: 20px;
        }
        .hero-content h1 .highlight {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content .hero-desc {
            font-size: 18px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 620px;
            margin-bottom: 32px;
        }

        .hero-content .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }

        .hero-content .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-subtle);
        }
        .hero-content .hero-meta span {
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hero-content .hero-meta span i {
            color: var(--primary);
        }

        /* ============================================
                   FEATURES / ADVANTAGES
                   ============================================ */
        .features {
            background: var(--bg-dark);
            position: relative;
        }
        .features::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .features .card .card-icon {
            background: rgba(245, 158, 11, 0.12);
            border-color: rgba(245, 158, 11, 0.2);
        }

        /* ============================================
                   PLATFORM OVERVIEW
                   ============================================ */
        .platform-overview {
            background: var(--bg-deep);
        }

        .platform-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .platform-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .platform-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.6s ease;
        }
        .platform-image:hover img {
            transform: scale(1.03);
        }
        .platform-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), transparent);
            pointer-events: none;
        }

        .platform-info h2 {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .platform-info h2 .highlight {
            color: var(--primary);
        }
        .platform-info p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .platform-info .feature-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 20px;
        }
        .platform-info .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .platform-info .feature-list li i {
            color: var(--primary);
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* ============================================
                   NEWS / CMS LIST
                   ============================================ */
        .news-section {
            background: var(--bg-dark);
            position: relative;
        }
        .news-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-card);
            padding: 20px 24px;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .news-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }
        .news-card .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .news-card .news-meta .news-cat {
            background: rgba(245, 158, 11, 0.1);
            color: var(--primary-light);
            padding: 2px 10px;
            border-radius: 100px;
            font-weight: 500;
        }
        .news-card .news-meta .news-date {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .news-card .news-meta .news-date i {
            font-size: 11px;
        }
        .news-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.5;
            margin: 0;
        }
        .news-card h3 a {
            color: var(--text-primary);
        }
        .news-card h3 a:hover {
            color: var(--primary);
        }
        .news-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            font-size: 15px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-card);
        }

        /* ============================================
                   PROCESS / STEPS
                   ============================================ */
        .process-section {
            background: var(--bg-deep);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }

        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-card);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(245, 158, 11, 0.2);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.12);
            border: 1px solid rgba(245, 158, 11, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--primary);
            margin: 0 auto 16px;
        }
        .step-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ============================================
                   STATS / COUNTERS
                   ============================================ */
        .stats-section {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .stat-item {
            padding: 24px 16px;
        }
        .stat-item .stat-number {
            font-size: 38px;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: -1px;
        }
        .stat-item .stat-number span {
            font-size: 28px;
        }
        .stat-item .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 6px;
            font-weight: 500;
        }

        /* ============================================
                   FAQ
                   ============================================ */
        .faq-section {
            background: var(--bg-deep);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-card);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(255, 255, 255, 0.1);
        }
        .faq-item.open {
            border-color: var(--border-active);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 24px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            background: none;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ============================================
                   CTA
                   ============================================ */
        .cta-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(7, 11, 20, 0.95), rgba(7, 11, 20, 0.85));
            z-index: 1;
        }

        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .cta-content h2 .highlight {
            color: var(--primary);
        }
        .cta-content p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .cta-content .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ============================================
                   FOOTER
                   ============================================ */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-subtle);
            padding: 48px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }
        .footer-brand .brand-text span {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-bottom .footer-links {
            display: flex;
            gap: 20px;
        }

        /* ============================================
                   RESPONSIVE
                   ============================================ */

        /* Tablet & below — sidebar collapses */
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .hero-content h1 {
                font-size: 40px;
            }
            .platform-grid {
                gap: 28px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 820px) {
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay {
                display: block;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                padding-top: 60px;
            }
            .hero {
                min-height: 70vh;
            }
            .hero-content h1 {
                font-size: 34px;
            }
            .hero-content .hero-desc {
                font-size: 16px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .platform-grid {
                grid-template-columns: 1fr;
            }
            .platform-image {
                order: -1;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section {
                padding: 56px 0;
            }
            .section-lg {
                padding: 72px 0;
            }
            .section-title h2 {
                font-size: 26px;
            }
            .cta-content h2 {
                font-size: 26px;
            }
        }

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 26px;
                letter-spacing: 0;
            }
            .hero-content .hero-desc {
                font-size: 14px;
            }
            .hero-content .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-content .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-content .hero-meta {
                flex-direction: column;
                gap: 12px;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title h2 {
                font-size: 22px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item .stat-number {
                font-size: 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom .footer-links {
                flex-wrap: wrap;
                justify-content: center;
            }
            .news-card {
                padding: 16px 18px;
            }
            .card {
                padding: 20px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }
            .faq-answer {
                padding: 0 16px;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
            .cta-content h2 {
                font-size: 22px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 15px;
            }
            .sidebar-brand {
                padding: 18px 16px 14px;
            }
            .sidebar-nav a {
                padding: 8px 12px;
                font-size: 14px;
            }
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .hero-content {
            animation: fadeInUp 0.8s ease forwards;
        }

        .sidebar-nav a.active i {
            color: var(--primary);
        }

        /* Focus visible for accessibility */
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* Smooth transition for sidebar overlay */
        .sidebar-overlay {
            transition: opacity 0.3s ease;
        }

        /* Selection */
        ::selection {
            background: rgba(245, 158, 11, 0.3);
            color: var(--text-primary);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --color-primary: #d4a843;
            --color-primary-dark: #b8922e;
            --color-primary-light: #e8c96a;
            --color-accent: #2c2c3e;
            --color-accent-light: #3a3a50;
            --color-bg: #0f0f1a;
            --color-bg-alt: #1a1a2e;
            --color-bg-card: #1e1e34;
            --color-bg-sidebar: #12121f;
            --color-text: #e8e8f0;
            --color-text-muted: #9a9ab0;
            --color-text-inverse: #12121f;
            --color-border: #2a2a44;
            --color-border-light: #3a3a5a;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.4);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 30px rgba(212,168,67,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --sidebar-width: 260px;
            --header-height: 64px;
            --max-width: 1200px;
            --content-max-width: 860px;
        }

        /* ===== 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-main);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            min-height: 100vh;
            display: flex;
        }
        a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--color-primary-light); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: #fff; }
        h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
        h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
        h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }
        p { margin-bottom: 1rem; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar / Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-bg-sidebar);
            border-right: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform 0.35s ease;
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 24px 20px 16px;
            border-bottom: 1px solid var(--color-border);
        }
        .brand-text {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.02em;
            line-height: 1.2;
        }
        .brand-text span {
            color: var(--color-primary);
            display: block;
            font-size: 0.9rem;
            font-weight: 400;
            letter-spacing: 0.1em;
            margin-top: 2px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 0;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 20px;
            color: var(--color-text-muted);
            font-size: 0.95rem;
            font-weight: 500;
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
        }
        .sidebar-nav a:hover {
            color: #fff;
            background: rgba(212,168,67,0.08);
            border-left-color: var(--color-primary);
        }
        .sidebar-nav a.active {
            color: #fff;
            background: rgba(212,168,67,0.12);
            border-left-color: var(--color-primary);
        }
        .sidebar-nav .nav-label {
            padding: 8px 20px 4px;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.12em;
            color: var(--color-text-muted);
            opacity: 0.6;
            font-weight: 600;
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--color-border);
            font-size: 0.75rem;
            color: var(--color-text-muted);
            text-align: center;
        }
        .sidebar-footer a { color: var(--color-text-muted); }
        .sidebar-footer a:hover { color: var(--color-primary); }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--color-bg-sidebar);
            border-bottom: 1px solid var(--color-border);
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            z-index: 1100;
        }
        .mobile-header .brand-text {
            font-size: 1.2rem;
        }
        .mobile-header .brand-text span {
            display: inline;
            font-size: 0.85rem;
        }
        .hamburger {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .hamburger:hover { background: rgba(255,255,255,0.08); }

        /* ===== Main Content ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content {
            flex: 1;
            padding: 40px 0 60px;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 60px 0 40px;
            background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
            border-bottom: 1px solid var(--color-border);
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: var(--color-text-muted);
        }
        .article-meta .category-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(212,168,67,0.15);
            color: var(--color-primary);
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .article-meta .date {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .date i { font-size: 0.8rem; }
        .article-hero h1 {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            color: #fff;
            max-width: 860px;
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .article-hero .lead {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 700px;
            line-height: 1.7;
        }

        /* ===== Article Body ===== */
        .article-body {
            padding: 40px 0;
        }
        .article-body .container {
            max-width: var(--content-max-width);
        }
        .article-content {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-md);
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
        }
        .article-content h2, .article-content h3, .article-content h4 {
            color: #fff;
            margin-top: 1.6em;
            margin-bottom: 0.6em;
        }
        .article-content h2 { font-size: 1.6rem; }
        .article-content h3 { font-size: 1.3rem; }
        .article-content p {
            margin-bottom: 1.2rem;
        }
        .article-content ul, .article-content ol {
            margin: 0 0 1.2rem 1.5rem;
        }
        .article-content li {
            margin-bottom: 0.4rem;
            list-style: disc;
        }
        .article-content ol li { list-style: decimal; }
        .article-content a {
            color: var(--color-primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content a:hover { color: var(--color-primary-light); }
        .article-content blockquote {
            border-left: 4px solid var(--color-primary);
            padding: 16px 24px;
            margin: 1.5rem 0;
            background: rgba(212,168,67,0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-muted);
            font-style: italic;
        }
        .article-content img {
            margin: 1.5rem auto;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }
        .article-content code {
            background: rgba(255,255,255,0.06);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--color-primary-light);
        }
        .article-content pre {
            background: var(--color-bg);
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            border: 1px solid var(--color-border);
            margin: 1.5rem 0;
        }
        .article-content pre code {
            background: none;
            padding: 0;
            color: var(--color-text);
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }
        .not-found-box i {
            font-size: 3rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            color: #fff;
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--color-text-muted);
            margin-bottom: 24px;
        }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-radius: 100px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-back:hover {
            background: var(--color-primary-light);
            color: var(--color-text-inverse);
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }

        /* ===== Article Footer Nav ===== */
        .article-nav {
            margin-top: 40px;
            max-width: var(--content-max-width);
            margin-left: auto;
            margin-right: auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .article-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: 100px;
            color: var(--color-text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .article-nav a:hover {
            border-color: var(--color-primary);
            color: #fff;
            background: rgba(212,168,67,0.08);
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 60px 0;
            border-top: 1px solid var(--color-border);
            margin-top: 20px;
        }
        .related-section h2 {
            text-align: center;
            margin-bottom: 32px;
            color: #fff;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .related-card {
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--color-border);
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--color-primary);
        }
        .related-card h3 {
            font-size: 1.05rem;
            color: #fff;
            margin-bottom: 8px;
        }
        .related-card h3 a { color: #fff; }
        .related-card h3 a:hover { color: var(--color-primary); }
        .related-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: 0;
        }
        .related-card .meta {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin-top: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-bg-alt);
            border-top: 1px solid var(--color-border);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .brand-text {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .footer-brand .brand-text span {
            display: inline;
            font-size: 0.85rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #fff;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            padding: 5px 0;
            font-size: 0.9rem;
            color: var(--color-text-muted);
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--color-primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--color-border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--color-text-muted);
        }
        .footer-bottom a {
            color: var(--color-text-muted);
        }
        .footer-bottom a:hover {
            color: var(--color-primary);
        }
        .footer-links {
            display: flex;
            gap: 16px;
        }

        /* ===== Back to Top ===== */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 900;
            opacity: 0;
            pointer-events: none;
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .back-to-top:hover {
            background: var(--color-primary-light);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--color-bg); }
        ::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--color-border-light); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .main-content {
                padding: 24px 0 40px;
            }
            .article-hero {
                padding: 32px 0 28px;
            }
            .article-content {
                padding: 24px 20px;
            }
            .article-nav {
                flex-direction: column;
                align-items: center;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-content { padding: 20px 16px; }
            .article-hero h1 { font-size: 1.5rem; }
            .article-meta { gap: 10px; font-size: 0.8rem; }
            .article-meta .category-tag { font-size: 0.7rem; padding: 3px 10px; }
            .related-card { padding: 18px; }
        }

        @media (min-width: 769px) {
            .sidebar {
                transform: translateX(0) !important;
            }
            .hamburger { display: none; }
        }

        /* ===== Overlay for mobile ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.6);
            z-index: 999;
        }
        .sidebar-overlay.active { display: block; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a0e1a;
            --primary-light: #1a1f2e;
            --primary-mid: #11172a;
            --accent: #c9a84c;
            --accent-hover: #e8c56d;
            --accent-dim: #8a7a3a;
            --blue-accent: #4a7cf7;
            --blue-hover: #6b96f9;
            --text-main: #f0f0f0;
            --text-muted: #b0b8c8;
            --text-dim: #7a8294;
            --bg-card: #141c2e;
            --bg-card-hover: #1c2640;
            --bg-section: #0d1224;
            --bg-section-alt: #11182e;
            --border-color: #1e2a44;
            --border-light: #2a3a5c;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.7);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --sidebar-width: 260px;
            --header-height: 64px;
        }

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

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .app-shell {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary-light);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .sidebar-brand .brand-icon {
            font-size: 28px;
            color: var(--accent);
        }
        .sidebar-brand .brand-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 1px;
            color: var(--text-main);
        }
        .sidebar-brand .brand-text span {
            color: var(--accent);
        }
        .sidebar-nav {
            flex: 1;
            padding: 24px 16px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-weight: 500;
            font-size: 15px;
            transition: var(--transition);
            position: relative;
        }
        .sidebar-nav .nav-item i {
            font-size: 18px;
            width: 22px;
            text-align: center;
            color: var(--text-dim);
            transition: var(--transition);
        }
        .sidebar-nav .nav-item:hover {
            background: var(--bg-card);
            color: var(--text-main);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--accent);
        }
        .sidebar-nav .nav-item.active {
            background: var(--bg-card);
            color: var(--accent);
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .sidebar-nav .nav-item.active i {
            color: var(--accent);
        }
        .sidebar-nav .nav-divider {
            height: 1px;
            background: var(--border-color);
            margin: 12px 18px;
        }
        .sidebar-footer {
            padding: 20px 24px;
            border-top: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-dim);
        }
        .sidebar-footer a {
            color: var(--text-dim);
        }
        .sidebar-footer a:hover {
            color: var(--accent);
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            background: var(--primary);
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--primary-light);
            border-bottom: 1px solid var(--border-color);
            padding: 0 20px;
            z-index: 999;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
        }
        .mobile-header .brand-text span {
            color: var(--accent);
        }
        .mobile-header .hamburger {
            background: none;
            border: none;
            color: var(--text-main);
            font-size: 24px;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .mobile-header .hamburger:hover {
            background: var(--bg-card);
        }

        /* ===== Sidebar Overlay (mobile) ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.7);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .sidebar-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        /* ===== Hero Section ===== */
        .hero-section {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 40px 60px;
            background: var(--primary) url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            isolation: isolate;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 14, 26, 0.92) 0%, rgba(10, 14, 26, 0.70) 50%, rgba(10, 14, 26, 0.88) 100%);
            z-index: 0;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 80%, rgba(201, 168, 76, 0.08) 0%, transparent 70%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 880px;
            padding: 20px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(201, 168, 76, 0.15);
            color: var(--accent);
            font-size: 14px;
            font-weight: 600;
            padding: 8px 20px;
            border-radius: 50px;
            border: 1px solid rgba(201, 168, 76, 0.25);
            margin-bottom: 28px;
            letter-spacing: 2px;
            text-transform: uppercase;
        }
        .hero-title {
            font-size: clamp(2.6rem, 7vw, 4.8rem);
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #ffffff 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-sub {
            font-size: clamp(1.05rem, 2vw, 1.35rem);
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .hero-actions .btn-primary {
            background: var(--accent);
            color: var(--primary);
            padding: 16px 40px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .hero-actions .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(201, 168, 76, 0.3);
        }
        .hero-actions .btn-secondary {
            background: transparent;
            color: var(--text-main);
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            border: 1px solid var(--border-light);
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .hero-actions .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(201, 168, 76, 0.06);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: center;
            margin-top: 50px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-item .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            display: block;
        }
        .hero-stat-item .label {
            font-size: 14px;
            color: var(--text-dim);
            margin-top: 4px;
        }

        /* ===== Section Base ===== */
        .section {
            padding: 90px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-title {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 700;
            text-align: center;
            margin-bottom: 16px;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-muted);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
            line-height: 1.8;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            letter-spacing: 2px;
            text-transform: uppercase;
            margin-bottom: 12px;
            text-align: center;
            width: 100%;
        }

        /* ===== Cards Grid ===== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--blue-accent));
            opacity: 0;
            transition: var(--transition);
        }
        .card:hover {
            border-color: var(--border-light);
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .card:hover::before {
            opacity: 1;
        }
        .card-icon {
            font-size: 32px;
            color: var(--accent);
            margin-bottom: 18px;
            display: inline-block;
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            background: rgba(201, 168, 76, 0.1);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 50px;
            margin-top: 16px;
            border: 1px solid rgba(201, 168, 76, 0.15);
        }
        .card-img {
            border-radius: var(--radius-sm);
            margin-bottom: 18px;
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--primary-mid);
        }

        /* ===== Feature Grid (图文混合) ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 40px;
            align-items: center;
        }
        .feature-item {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .feature-item img {
            border-radius: var(--radius-md);
            width: 100%;
            height: 240px;
            object-fit: cover;
            background: var(--primary-mid);
            border: 1px solid var(--border-color);
        }
        .feature-text h3 {
            font-size: 1.4rem;
            margin-bottom: 10px;
        }
        .feature-text p {
            color: var(--text-muted);
            line-height: 1.8;
        }
        .feature-text .feature-list {
            margin-top: 16px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .feature-text .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--text-muted);
            font-size: 0.95rem;
        }
        .feature-text .feature-list li i {
            color: var(--accent);
            font-size: 16px;
            margin-top: 4px;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            position: relative;
        }
        .process-step {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .process-step:hover {
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-sm);
        }
        .process-step .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dim));
            color: var(--primary);
            font-weight: 800;
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
        }
        .process-step h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }
        .process-step p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-main);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question i {
            font-size: 18px;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            text-align: center;
            padding: 100px 0;
            background: var(--bg-section-alt) url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            isolation: isolate;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 14, 26, 0.92) 0%, rgba(10, 14, 26, 0.8) 100%);
            z-index: 0;
        }
        .cta-content {
            position: relative;
            z-index: 1;
            max-width: 660px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .cta-content h2 {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            margin-bottom: 18px;
        }
        .cta-content p {
            color: var(--text-muted);
            font-size: 1.1rem;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .cta-content .btn-cta {
            background: var(--accent);
            color: var(--primary);
            padding: 18px 48px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 17px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 12px;
        }
        .cta-content .btn-cta:hover {
            background: var(--accent-hover);
            transform: translateY(-3px);
            box-shadow: 0 16px 48px rgba(201, 168, 76, 0.35);
        }

        /* ===== Footer (reuse) ===== */
        .site-footer {
            background: var(--primary-light);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            margin-left: var(--sidebar-width);
        }
        .site-footer .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
        }
        .footer-brand .brand-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 14px;
        }
        .footer-brand .brand-text span {
            color: var(--accent);
        }
        .footer-brand p {
            color: var(--text-dim);
            font-size: 0.9rem;
            line-height: 1.8;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 18px;
        }
        .footer-col a {
            display: block;
            color: var(--text-dim);
            font-size: 14px;
            padding: 6px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 13px;
            color: var(--text-dim);
            gap: 16px;
        }
        .footer-bottom a {
            color: var(--text-dim);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-bottom .footer-links {
            display: flex;
            gap: 20px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .mobile-header {
                display: flex;
            }
            .site-footer {
                margin-left: 0;
            }
            .hero-section {
                min-height: 70vh;
                padding: 60px 24px 40px;
            }
            .section {
                padding: 60px 0;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat-item .num {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: clamp(2rem, 8vw, 3rem);
            }
            .hero-sub {
                font-size: 1rem;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                padding: 14px 28px;
                font-size: 15px;
            }
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .section-sub {
                font-size: 1rem;
                margin-bottom: 36px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
                padding-top: 24px;
                margin-top: 30px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-section {
                padding: 40px 16px 32px;
                min-height: 60vh;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-badge {
                font-size: 12px;
                padding: 6px 16px;
            }
            .section {
                padding: 48px 0;
            }
            .process-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .card {
                padding: 24px 20px;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 16px 18px;
            }
            .faq-answer {
                font-size: 0.88rem;
                padding: 0 18px;
            }
            .faq-answer.open {
                padding: 0 18px 16px;
            }
            .cta-content .btn-cta {
                padding: 14px 32px;
                font-size: 15px;
                width: 100%;
                justify-content: center;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .sidebar-brand .brand-text {
                font-size: 17px;
            }
            .sidebar-nav .nav-item {
                padding: 12px 14px;
                font-size: 14px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--primary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-dim);
        }

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-item:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Smooth image loading ===== */
        .card-img,
        .feature-item img {
            background-color: var(--primary-mid);
            transition: opacity 0.4s ease;
        }