/* roulang page: index */
:root {
            --primary: #1a56db;
            --primary-dark: #0b2a5e;
            --primary-light: #e8effc;
            --accent: #0ea5e9;
            --bg: #f5f7fb;
            --bg-alt: #eef2f9;
            --surface: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --border-strong: #cbd5e1;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
            --shadow-primary: 0 8px 32px rgba(26, 86, 219, 0.22);
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --spacing-2xl: 48px;
            --spacing-3xl: 64px;
            --spacing-4xl: 80px;
            --container-width: 1200px;
            --transition-fast: 0.18s ease;
            --transition-base: 0.25s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--primary);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: var(--spacing-md);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
            letter-spacing: -0.02em;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .logo:hover {
            color: var(--primary);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }

        .nav-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 12px;
            border-radius: 999px;
            background: linear-gradient(135deg, #fff7ed, #fef3c7);
            color: #b45309;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid #fde68a;
            white-space: nowrap;
        }

        .nav-chip .dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: #f59e0b;
            animation: pulse-dot 1.8s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.4); opacity: 0.6; }
        }

        .nav-cta {
            padding: 9px 20px;
            border-radius: 999px;
            background: var(--primary);
            color: #fff;
            font-size: 0.88rem;
            font-weight: 600;
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: var(--shadow-primary);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--primary-dark);
            border-radius: 2px;
            transition: all var(--transition-base);
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            padding: var(--spacing-4xl) 0 var(--spacing-3xl);
            background:
                linear-gradient(135deg, rgba(255,255,255,0.93) 0%, rgba(235,242,255,0.88) 55%, rgba(232,240,254,0.82) 100%),
                url('/assets/images/1d76db1eb4cd78e7.webp') center / cover no-repeat;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -15%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(26,86,219,0.07) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: var(--spacing-3xl);
            align-items: center;
        }

        .hero-copy {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-lg);
        }

        .hero-label {
            align-self: flex-start;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 16px;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .hero-title {
            font-size: clamp(1.9rem, 4vw, 2.75rem);
            font-weight: 800;
            line-height: 1.28;
            color: var(--primary-dark);
            letter-spacing: -0.03em;
        }

        .hero-title .highlight {
            color: var(--primary);
            position: relative;
        }

        .hero-description {
            font-size: 1.02rem;
            line-height: 1.75;
            color: var(--text-secondary);
            max-width: 560px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            margin-top: var(--spacing-sm);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 26px;
            border-radius: 999px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-primary);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(26,86,219,0.3);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-xl);
            padding-top: var(--spacing-md);
            border-top: 1px solid var(--border);
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-number {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.02em;
        }

        .hero-stat-label {
            font-size: 0.82rem;
            color: var(--text-weak);
        }

        .hero-panel {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }

        .hero-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
            transition: all var(--transition-base);
        }

        .hero-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border-strong);
        }

        .hero-card-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: var(--spacing-sm);
        }

        .hero-card-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
        }

        .hero-card-tag {
            font-size: 0.72rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary);
        }

        .hero-card-desc {
            font-size: 0.88rem;
            color: var(--text-weak);
            line-height: 1.6;
        }

        .hero-card-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-md);
        }

        .hero-card-list .hero-card {
            padding: var(--spacing-md);
        }

        /* ========== SECTIONS ========== */
        .section {
            padding: var(--spacing-3xl) 0;
        }

        .section-alt {
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            margin-bottom: var(--spacing-xl);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--primary);
            margin-bottom: var(--spacing-sm);
        }

        .section-title {
            font-size: clamp(1.4rem, 3vw, 1.9rem);
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.025em;
            margin-bottom: var(--spacing-sm);
            line-height: 1.3;
        }

        .section-description {
            font-size: 0.98rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
        }

        /* ========== GRID / CARDS ========== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--spacing-lg);
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }

        .card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition-base);
        }

        .card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-strong);
            transform: translateY(-2px);
        }

        .card-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            margin-bottom: var(--spacing-md);
            background: var(--bg-alt);
        }

        .card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: var(--spacing-xs);
            line-height: 1.4;
        }

        .card-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: var(--spacing-sm);
        }

        .card-meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.78rem;
            color: var(--text-weak);
        }

        .card-tag {
            display: inline-flex;
            padding: 3px 10px;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.72rem;
            font-weight: 600;
        }

        .card-link {
            display: block;
            color: inherit;
        }

        .card-link:hover .card-title {
            color: var(--primary);
        }

        /* ========== ENTRY MATRIX ========== */
        .entry-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }

        .entry-item {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            padding: var(--spacing-md);
            border-radius: var(--radius-md);
            background: var(--surface);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .entry-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .entry-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
            background: var(--primary-light);
            color: var(--primary);
        }

        .entry-info {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .entry-name {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text);
        }

        .entry-count {
            font-size: 0.75rem;
            color: var(--text-weak);
        }

        /* ========== CONTENT LIST ========== */
        .content-list {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: var(--spacing-xl);
        }

        .content-list-main {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }

        .content-list-item {
            display: flex;
            gap: var(--spacing-md);
            padding: var(--spacing-md);
            border-radius: var(--radius-md);
            background: var(--surface);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .content-list-item:hover {
            border-color: var(--border-strong);
            box-shadow: var(--shadow-md);
            transform: translateX(3px);
        }

        .content-list-thumb {
            width: 120px;
            height: 80px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-alt);
        }

        .content-list-body {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
            flex: 1;
            min-width: 0;
        }

        .content-list-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
        }

        .content-list-desc {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .content-list-meta {
            font-size: 0.75rem;
            color: var(--text-weak);
            display: flex;
            gap: var(--spacing-md);
        }

        .content-list-sidebar {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }

        .sidebar-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .sidebar-card-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: var(--spacing-md);
            padding-bottom: var(--spacing-sm);
            border-bottom: 1px solid var(--border);
        }

        .sidebar-item {
            display: flex;
            gap: var(--spacing-sm);
            padding: var(--spacing-sm) 0;
            border-bottom: 1px solid var(--border);
        }

        .sidebar-item:last-child {
            border-bottom: none;
        }

        .sidebar-item-thumb {
            width: 56px;
            height: 40px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-alt);
        }

        .sidebar-item-title {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .sidebar-item:hover .sidebar-item-title {
            color: var(--primary);
        }

        .empty-state {
            padding: var(--spacing-xl);
            text-align: center;
            color: var(--text-weak);
            font-size: 0.9rem;
            background: var(--bg-alt);
            border-radius: var(--radius-md);
        }

        /* ========== PROCESS STEPS ========== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-lg);
        }

        .step {
            background: var(--surface);
            padding: var(--spacing-lg);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            position: relative;
            transition: all var(--transition-base);
        }

        .step:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .step-number {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: var(--spacing-sm);
        }

        .step-title {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: var(--spacing-xs);
        }

        .step-desc {
            font-size: 0.84rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== TESTIMONIALS ========== */
        .testimonials {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

        .testimonial-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .testimonial-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
            padding-top: var(--spacing-sm);
            border-top: 1px solid var(--border);
        }

        .testimonial-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-weight: 700;
            font-size: 0.85rem;
        }

        /* ========== DATA BAND ========== */
        .data-band {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #1e3a6e 100%);
            border-radius: var(--radius-lg);
            padding: var(--spacing-2xl);
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-xl);
            text-align: center;
            color: #fff;
        }

        .data-band-item {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
        }

        .data-band-number {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.03em;
        }

        .data-band-label {
            font-size: 0.85rem;
            opacity: 0.75;
        }

        /* ========== VERSION / UPDATE ========== */
        .version-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }

        .version-item {
            display: flex;
            gap: var(--spacing-lg);
            padding: var(--spacing-md);
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .version-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(3px);
        }

        .version-tag {
            align-self: flex-start;
            padding: 5px 12px;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.78rem;
            font-weight: 700;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .version-content {
            flex: 1;
        }

        .version-title {
            font-weight: 700;
            color: var(--text);
            font-size: 0.92rem;
            margin-bottom: 2px;
        }

        .version-desc {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ========== FAQ ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .faq-item {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-md) var(--spacing-lg);
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            background: transparent;
            border: none;
            text-align: left;
            gap: var(--spacing-sm);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform var(--transition-base);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 var(--spacing-lg);
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--spacing-lg) var(--spacing-md);
        }

        /* ========== CTA ========== */
        .cta-band {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: var(--spacing-2xl);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-xl);
            color: #fff;
            flex-wrap: wrap;
        }

        .cta-band-title {
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        .cta-band-desc {
            font-size: 0.92rem;
            opacity: 0.85;
            max-width: 500px;
        }

        .btn-light {
            background: #fff;
            color: var(--primary-dark);
            padding: 12px 28px;
            border-radius: 999px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(255,255,255,0.25);
            color: var(--primary);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.75);
            padding: var(--spacing-3xl) 0 var(--spacing-xl);
            margin-top: var(--spacing-3xl);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-xl);
        }

        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .footer-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
        }

        .footer-desc {
            font-size: 0.85rem;
            line-height: 1.6;
            opacity: 0.7;
        }

        .footer-col-title {
            font-size: 0.88rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--spacing-md);
            letter-spacing: 0.03em;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            transition: all var(--transition-fast);
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-bottom {
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255,255,255,0.12);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            font-size: 0.8rem;
            color: rgba(255,255,255,0.5);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                gap: var(--spacing-xl);
            }
            .hero-panel {
                max-width: 600px;
            }
            .entry-matrix {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-band {
                grid-template-columns: repeat(2, 1fr);
            }
            .content-list {
                grid-template-columns: 1fr;
            }
            .content-list-sidebar {
                display: grid;
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                flex-wrap: wrap;
                min-height: auto;
                padding-top: var(--spacing-sm);
                padding-bottom: var(--spacing-sm);
            }
            .main-nav {
                width: 100%;
                flex-wrap: wrap;
                gap: var(--spacing-sm);
            }
            .nav-links {
                flex-wrap: wrap;
                gap: var(--spacing-xs);
            }
            .nav-link {
                padding: 6px 12px;
                font-size: 0.85rem;
            }
            .nav-chips {
                display: none;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .testimonials {
                grid-template-columns: 1fr;
            }
            .entry-matrix {
                grid-template-columns: 1fr;
            }
            .steps {
                grid-template-columns: 1fr;
            }
            .content-list-sidebar {
                grid-template-columns: 1fr;
            }
            .cta-band {
                flex-direction: column;
                text-align: center;
                align-items: stretch;
            }
            .hero {
                padding: var(--spacing-2xl) 0 var(--spacing-xl);
            }
            .section {
                padding: var(--spacing-2xl) 0;
            }
            .data-band {
                grid-template-columns: 1fr 1fr;
                padding: var(--spacing-lg);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .hero-card-list {
                grid-template-columns: 1fr;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding: var(--spacing-sm) 0;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-link {
                text-align: center;
                padding: 10px;
            }
            .nav-cta {
                display: none;
            }
        }

        @media (max-width: 520px) {
            :root {
                --container-width: 100%;
            }
            .container {
                padding: 0 var(--spacing-md);
            }
            .hero-title {
                font-size: 1.55rem;
            }
            .hero-description {
                font-size: 0.92rem;
            }
            .hero-stats {
                gap: var(--spacing-md);
            }
            .hero-stat-number {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .data-band {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .content-list-thumb {
                width: 80px;
                height: 56px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.88rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: var(--spacing-xs);
            }
        }

/* roulang page: category1 */
:root {
            --primary: #1a56db;
            --primary-dark: #0b2a5e;
            --primary-light: #e8effc;
            --accent: #0ea5e9;
            --bg: #f5f7fb;
            --bg-alt: #eef2f9;
            --surface: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --border-strong: #cbd5e1;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
            --shadow-primary: 0 8px 32px rgba(26, 86, 219, 0.22);
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --spacing-2xl: 48px;
            --spacing-3xl: 64px;
            --spacing-4xl: 80px;
            --container-width: 1200px;
            --transition-fast: 0.18s ease;
            --transition-base: 0.25s ease;
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
        }

        * {
            box-sizing: border-box;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--primary);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: var(--spacing-md);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
            letter-spacing: -0.02em;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .logo:hover {
            color: var(--primary);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .nav-link {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }

        .nav-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 12px;
            border-radius: 999px;
            background: linear-gradient(135deg, #fff7ed, #fef3c7);
            color: #b45309;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid #fde68a;
            white-space: nowrap;
        }

        .nav-chip .dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: #f59e0b;
            animation: pulse-dot 1.8s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(0.75); }
        }

        .nav-cta {
            padding: 9px 20px;
            border-radius: 999px;
            background: var(--primary);
            color: #fff;
            font-size: 0.88rem;
            font-weight: 600;
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: var(--shadow-primary);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--primary-dark);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }

        /* ========== CATEGORY HERO ========== */
        .category-hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #1e3a8a 45%, #1e40af 100%);
            color: #fff;
            padding: var(--spacing-3xl) 0 var(--spacing-2xl);
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at top right, rgba(14, 165, 233, 0.35), transparent 55%);
            pointer-events: none;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at bottom left, rgba(26, 86, 219, 0.42), transparent 60%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .hero-breadcrumb {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .hero-breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }

        .hero-breadcrumb a:hover {
            color: #fff;
        }

        .hero-breadcrumb .sep {
            color: rgba(255, 255, 255, 0.45);
        }

        .category-hero h1 {
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: var(--spacing-md);
            color: #fff;
            line-height: 1.25;
        }

        .category-hero .hero-sub {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.82);
            max-width: 680px;
            margin-bottom: var(--spacing-lg);
            line-height: 1.7;
        }

        .hero-meta {
            display: flex;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
            margin-top: var(--spacing-md);
        }

        .hero-meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.85);
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 999px;
            padding: 8px 18px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .hero-meta-item i {
            color: #fbbf24;
        }

        /* ========== SECTION SHARED ========== */
        .section {
            padding: var(--spacing-3xl) 0;
        }

        .section-alt {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            margin-bottom: var(--spacing-2xl);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.78rem;
            font-weight: 650;
            color: var(--primary);
            background: var(--primary-light);
            border-radius: 999px;
            padding: 4px 14px;
            letter-spacing: 0.04em;
            margin-bottom: var(--spacing-sm);
        }

        .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.02em;
            margin-bottom: var(--spacing-sm);
            line-height: 1.3;
        }

        .section-desc {
            font-size: 1.02rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.7;
        }

        /* ========== PAIN POINT / SOLUTIONS ========== */
        .pain-card,
        .solution-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-xl);
            height: 100%;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

        .pain-card:hover,
        .solution-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--border-strong);
        }

        .pain-card .icon-wrap,
        .solution-card .icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: var(--spacing-md);
            font-size: 1.2rem;
        }

        .pain-card .icon-wrap {
            background: #fef2f2;
            color: #dc2626;
        }

        .solution-card .icon-wrap {
            background: var(--primary-light);
            color: var(--primary);
        }

        .pain-card h3,
        .solution-card h3 {
            font-size: 1.12rem;
            font-weight: 650;
            margin-bottom: var(--spacing-sm);
            color: var(--text);
        }

        .pain-card p,
        .solution-card p {
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        /* ========== STEPS ========== */
        .step-row {
            display: flex;
            gap: var(--spacing-lg);
            align-items: stretch;
        }

        .step-item {
            flex: 1;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-xl);
            position: relative;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: #fff;
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: var(--spacing-md);
            box-shadow: var(--shadow-primary);
        }

        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 650;
            color: var(--text);
            margin-bottom: var(--spacing-xs);
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin: 0;
        }

        /* ========== TESTIMONIALS ========== */
        .testimonial-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-xl);
            height: 100%;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
            transition: all var(--transition-base);
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-strong);
        }

        .testimonial-card .quote {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            position: relative;
            padding-left: var(--spacing-md);
            border-left: 3px solid var(--primary);
            flex-grow: 1;
        }

        .testimonial-card .user {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .testimonial-card .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.85rem;
        }

        .testimonial-card .user-name {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
        }

        .testimonial-card .user-tag {
            font-size: 0.75rem;
            color: var(--text-weak);
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 0.85rem;
        }

        /* ========== INFO LIST / CMS ========== */
        .info-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }

        .info-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .info-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--border-strong);
        }

        .info-card .thumb {
            aspect-ratio: 16/9;
            background: var(--bg-alt);
            overflow: hidden;
            position: relative;
        }

        .info-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-base);
        }

        .info-card:hover .thumb img {
            transform: scale(1.05);
        }

        .info-card .thumb .badge-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(15, 23, 42, 0.7);
            color: #fff;
            font-size: 0.72rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .info-card .card-body {
            padding: var(--spacing-lg);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            flex-grow: 1;
        }

        .info-card .card-body h4 {
            font-size: 1rem;
            font-weight: 650;
            color: var(--text);
            line-height: 1.45;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .info-card .card-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .info-card .card-meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.78rem;
            color: var(--text-weak);
            margin-top: auto;
            padding-top: var(--spacing-sm);
        }

        .info-card .card-meta i {
            color: var(--primary);
        }

        .empty-state {
            text-align: center;
            padding: var(--spacing-2xl);
            color: var(--text-weak);
            font-size: 1rem;
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-strong);
        }

        /* ========== STATS ROW ========== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-lg);
        }

        .stat-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--spacing-xl);
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: var(--spacing-xs);
        }

        .stat-label {
            font-size: 0.88rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ========== CTA BAND ========== */
        .cta-band {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #1e3a8a 50%, #1e40af 100%);
            color: #fff;
            padding: var(--spacing-3xl) 0;
            position: relative;
            overflow: hidden;
        }

        .cta-band::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(14, 165, 233, 0.3), transparent 60%);
            pointer-events: none;
        }

        .cta-band .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .cta-band h2 {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: var(--spacing-md);
            color: #fff;
        }

        .cta-band p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.82);
            max-width: 620px;
            margin: 0 auto var(--spacing-xl);
            line-height: 1.7;
        }

        .btn-primary-hero {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 999px;
            background: #fff;
            color: var(--primary-dark);
            font-size: 1rem;
            font-weight: 650;
            transition: all var(--transition-base);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
        }

        .btn-primary-hero:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 44px rgba(0, 0, 0, 0.24);
            color: var(--primary);
        }

        .btn-outline-light-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 999px;
            background: transparent;
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            border: 1.5px solid rgba(255, 255, 255, 0.5);
            transition: all var(--transition-base);
            margin-left: var(--spacing-sm);
        }

        .btn-outline-light-custom:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.8);
            transform: translateY(-2px);
        }

        /* ========== AUDIENCE ========== */
        .audience-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }

        .audience-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: 999px;
            background: var(--surface);
            border: 1px solid var(--border);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
        }

        .audience-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        .audience-tag i {
            color: var(--accent);
            font-size: 0.85rem;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: var(--spacing-3xl) 0 var(--spacing-xl);
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: var(--spacing-2xl);
            margin-bottom: var(--spacing-2xl);
        }

        .footer-logo {
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--spacing-md);
        }

        .footer-desc {
            font-size: 0.88rem;
            color: #94a3b8;
            line-height: 1.7;
            margin: 0;
            max-width: 320px;
        }

        .footer-col-title {
            font-size: 0.85rem;
            font-weight: 650;
            color: #e2e8f0;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: var(--spacing-md);
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .footer-links a {
            color: #94a3b8;
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.8rem;
            color: #64748b;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .info-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }

            .nav-links {
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background: var(--surface);
                flex-direction: column;
                padding: var(--spacing-lg);
                gap: var(--spacing-sm);
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                display: none;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-link {
                width: 100%;
                text-align: center;
                padding: 12px 16px;
                font-size: 1rem;
            }

            .nav-chip {
                display: none;
            }

            .nav-cta {
                padding: 8px 16px;
                font-size: 0.8rem;
            }

            .site-header .container {
                padding: 0 var(--spacing-md);
                min-height: 60px;
            }

            .nav-links {
                top: 60px;
            }

            .category-hero {
                padding: var(--spacing-2xl) 0 var(--spacing-xl);
            }

            .category-hero h1 {
                font-size: 1.8rem;
            }

            .category-hero .hero-sub {
                font-size: 0.95rem;
            }

            .hero-meta {
                gap: var(--spacing-sm);
            }

            .hero-meta-item {
                font-size: 0.8rem;
                padding: 6px 14px;
            }

            .section {
                padding: var(--spacing-2xl) 0;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .step-row {
                flex-direction: column;
            }

            .info-list {
                grid-template-columns: 1fr;
            }

            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }

            .stat-number {
                font-size: 1.7rem;
            }

            .cta-band h2 {
                font-size: 1.5rem;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-xl);
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 var(--spacing-md);
            }

            .category-hero h1 {
                font-size: 1.5rem;
            }

            .hero-meta {
                flex-direction: column;
                align-items: flex-start;
            }

            .stats-row {
                grid-template-columns: 1fr;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }

            .btn-primary-hero,
            .btn-outline-light-custom {
                display: flex;
                width: 100%;
                justify-content: center;
                margin-left: 0;
                margin-bottom: var(--spacing-sm);
            }

            .cta-band .btn-group-custom {
                display: flex;
                flex-direction: column;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: article */
:root {
    --primary: #1a56db;
    --primary-dark: #0b2a5e;
    --primary-light: #e8effc;
    --accent: #0ea5e9;
    --accent-light: #e0f2fe;
    --bg: #f5f7fb;
    --bg-alt: #eef2f9;
    --surface: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-weak: #64748b;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
    --shadow-primary: 0 8px 32px rgba(26, 86, 219, 0.22);
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    --container-width: 1200px;
    --transition-fast: 0.18s ease;
    --transition-base: 0.25s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--primary);
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
button, input, textarea {
    font-family: inherit;
    font-size: inherit;
}
button {
    cursor: pointer;
    border: none;
    background: none;
}
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}
.section {
    padding: var(--spacing-3xl) 0;
}
.section-alt {
    background: var(--surface);
}
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}
.section-subtitle {
    font-size: 1rem;
    color: var(--text-weak);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}
.text-center {
    text-align: center;
}
/* ========== HEADER / NAV ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 68px;
    gap: var(--spacing-md);
}
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary-dark);
    white-space: nowrap;
    letter-spacing: -0.02em;
}
.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
    flex-shrink: 0;
}
.logo:hover {
    color: var(--primary);
}
.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}
.nav-link {
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    white-space: nowrap;
}
.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}
.nav-link.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}
.nav-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, #fff7ed, #fef3c7);
    color: #b45309;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid #fde68a;
    white-space: nowrap;
}
.nav-chip .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #f59e0b;
    animation: pulse-dot 1.8s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.4); }
}
.nav-cta {
    padding: 9px 20px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 0.88rem;
    font-weight: 600;
    transition: all var(--transition-base);
    white-space: nowrap;
}
.nav-cta:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: var(--shadow-primary);
    transform: translateY(-1px);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all var(--transition-fast);
}
.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition-fast);
}
.nav-toggle:hover {
    border-color: var(--primary);
}
.nav-toggle:hover span {
    background: var(--primary);
}
@media (max-width: 900px) {
    .nav-toggle {
        display: flex;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        padding: var(--spacing-md) var(--spacing-lg);
        gap: var(--spacing-sm);
        z-index: 99;
    }
    .nav-links.open {
        display: flex;
    }
    .nav-links .nav-link {
        display: block;
        width: 100%;
        text-align: left;
        padding: 12px 16px;
    }
    .nav-chip {
        display: none;
    }
    .nav-cta {
        padding: 8px 16px;
        font-size: 0.82rem;
    }
}
@media (max-width: 520px) {
    .site-header .container {
        min-height: 60px;
        padding: 0 var(--spacing-md);
    }
    .logo {
        font-size: 1rem;
    }
    .logo-icon {
        width: 30px;
        height: 30px;
        font-size: 0.85rem;
    }
    .nav-cta {
        padding: 7px 14px;
    }
}
/* ========== BREADCRUMB ========== */
.breadcrumb-bar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) 0;
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-weak);
    flex-wrap: wrap;
}
.breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}
.breadcrumb a:hover {
    color: var(--primary);
}
.breadcrumb .separator {
    color: var(--border-strong);
    user-select: none;
}
.breadcrumb .current {
    color: var(--primary);
    font-weight: 500;
    word-break: break-word;
}
/* ========== ARTICLE HEADER ========== */
.article-hero {
    background: linear-gradient(180deg, #fafcff 0%, var(--bg) 100%);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}
.article-hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--spacing-2xl);
    align-items: center;
}
.article-category-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}
.article-hero h1 {
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.35;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}
.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-weak);
    margin-bottom: var(--spacing-md);
}
.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.article-meta .meta-icon {
    color: var(--primary);
}
.article-excerpt {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 580px;
}
.article-cover-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    background: var(--surface);
}
.article-cover-wrap img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}
@media (max-width: 768px) {
    .article-hero-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    .article-hero h1 {
        font-size: 1.6rem;
    }
    .article-cover-wrap img {
        height: 200px;
    }
}
/* ========== ARTICLE BODY ========== */
.article-body-section {
    padding: var(--spacing-xl) 0;
}
.article-body {
    max-width: 760px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    padding: var(--spacing-2xl);
    line-height: 1.85;
    color: var(--text);
}
.article-body h2 {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text);
    margin: var(--spacing-xl) 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-light);
    letter-spacing: -0.01em;
}
.article-body h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
}
.article-body p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}
.article-body ul,
.article-body ol {
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
}
.article-body li {
    margin-bottom: var(--spacing-sm);
}
.article-body img {
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) auto;
    max-width: 100%;
    box-shadow: var(--shadow-md);
}
.article-body blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
}
.article-body a {
    color: var(--primary);
    font-weight: 500;
    border-bottom: 1px solid var(--primary);
    transition: all var(--transition-fast);
}
.article-body a:hover {
    color: var(--primary-dark);
    border-bottom-color: var(--primary-dark);
}
.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    font-size: 0.9rem;
}
.article-body table th,
.article-body table td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
    color: var(--text-secondary);
}
.article-body table th {
    background: var(--bg-alt);
    font-weight: 600;
    color: var(--text);
}
.article-body pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-size: 0.85rem;
    margin: var(--spacing-lg) 0;
}
.article-body code {
    background: var(--bg-alt);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-dark);
}
.article-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}
.empty-state {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-strong);
}
.empty-state p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}
.empty-state a {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    transition: all var(--transition-base);
}
.empty-state a:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: var(--shadow-primary);
}
@media (max-width: 768px) {
    .article-body {
        padding: var(--spacing-lg);
    }
    .article-body h2 {
        font-size: 1.25rem;
    }
    .article-body h3 {
        font-size: 1.05rem;
    }
}
/* ========== RELATED CHANNELS ========== */
.related-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-alt);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}
.related-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all var(--transition-base);
    text-align: center;
}
.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}
.related-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}
.related-card-body {
    padding: var(--spacing-lg);
}
.related-card-body h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}
.related-card-body p {
    font-size: 0.85rem;
    color: var(--text-weak);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}
.related-link {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}
.related-link:hover {
    background: var(--primary);
    color: #fff;
}
@media (max-width: 768px) {
    .related-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    .related-card img {
        height: 160px;
    }
}
/* ========== METRICS ========== */
.metrics-section {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1e40af 100%);
}
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}
.metric-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
}
.metric-number {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xs);
}
.metric-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
}
@media (max-width: 768px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    .metric-number {
        font-size: 1.5rem;
    }
}
/* ========== BENEFITS ========== */
.benefits-section {
    padding: var(--spacing-3xl) 0;
}
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}
.benefit-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}
.benefit-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.benefit-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}
.benefit-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}
.benefit-card p {
    font-size: 0.9rem;
    color: var(--text-weak);
    line-height: 1.7;
}
@media (max-width: 768px) {
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}
/* ========== FAQ ========== */
.faq-section {
    padding: var(--spacing-3xl) 0;
    background: var(--surface);
}
.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}
.faq-item {
    background: var(--bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all var(--transition-fast);
}
.faq-item:hover {
    border-color: var(--primary);
}
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    user-select: none;
    font-size: 0.95rem;
    gap: var(--spacing-md);
}
.faq-question .faq-toggle-icon {
    color: var(--primary);
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}
.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-weak);
    line-height: 1.7;
}
.faq-item.open .faq-toggle-icon {
    transform: rotate(45deg);
}
/* ========== ARTICLE CTA ========== */
.article-cta-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
}
.article-cta-box {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl) var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}
.article-cta-box h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}
.article-cta-box p {
    color: var(--text-weak);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}
.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}
.btn-primary {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    transition: all var(--transition-base);
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: var(--shadow-primary);
    transform: translateY(-2px);
}
.btn-outline {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 999px;
    background: var(--surface);
    color: var(--primary);
    font-weight: 600;
    border: 1px solid var(--primary);
    transition: all var(--transition-base);
}
.btn-outline:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}
@media (max-width: 520px) {
    .article-cta-box {
        padding: var(--spacing-lg);
    }
    .article-cta-box h2 {
        font-size: 1.2rem;
    }
    .cta-buttons {
        flex-direction: column;
    }
}
/* ========== FOOTER ========== */
.site-footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.75);
    padding: var(--spacing-2xl) 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.site-footer .container {
    padding-bottom: var(--spacing-xl);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand .footer-logo {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--spacing-sm);
}
.footer-desc {
    font-size: 0.85rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.65);
}
.footer-col-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.02em;
}
.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.footer-links a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.65);
    transition: color var(--transition-fast);
}
.footer-links a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
}
@media (max-width: 520px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}