/* roulang page: index */
:root {
            --nav-width: 240px;
            --nav-bg: #0B0B1A;
            --nav-hover: #1A1A35;
            --nav-active: #7C5CFC;
            --nav-text: #B0B0C8;
            --nav-text-light: #E8E8F0;
            --bg-primary: #0F0F22;
            --bg-secondary: #14142D;
            --bg-card: #1A1A38;
            --bg-card-hover: #202048;
            --bg-elevated: #1E1E42;
            --color-primary: #7C5CFC;
            --color-primary-hover: #9370FF;
            --color-primary-glow: rgba(124, 92, 252, 0.35);
            --color-accent: #F0B860;
            --color-accent-hover: #F5C97A;
            --color-coral: #FF5E7A;
            --color-coral-hover: #FF7B92;
            --color-success: #34D399;
            --text-primary: #F0F0FA;
            --text-secondary: #C0C0D8;
            --text-muted: #8888A8;
            --text-weak: #6A6A88;
            --border-subtle: #252545;
            --border-medium: #353560;
            --border-light: #454575;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 30px rgba(124, 92, 252, 0.25);
            --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.3);
            --transition-fast: 0.18s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            display: flex;
            flex-direction: row;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
            transition: all var(--transition-fast);
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }
        input {
            font-family: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.6rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.9rem;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.35rem;
        }

        /* ============ LEFT NAVIGATION (App Shell) ============ */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--nav-bg);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            border-right: 1px solid var(--border-subtle);
            transition: transform var(--transition-base);
            overflow-y: auto;
            overflow-x: hidden;
        }
        .app-nav-logo {
            padding: 24px 20px 20px 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid var(--border-subtle);
            flex-shrink: 0;
        }
        .app-nav-logo .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary), #5B3FD9);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            flex-shrink: 0;
            box-shadow: var(--shadow-glow);
        }
        .app-nav-logo .logo-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.01em;
            white-space: nowrap;
        }
        .app-nav-menu {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .app-nav-menu a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--nav-text);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .app-nav-menu a:hover {
            background: var(--nav-hover);
            color: var(--nav-text-light);
        }
        .app-nav-menu a.active {
            background: rgba(124, 92, 252, 0.15);
            color: var(--nav-active);
            font-weight: 600;
        }
        .app-nav-menu a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--nav-active);
            border-radius: 0 3px 3px 0;
        }
        .app-nav-menu a .nav-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
        }
        .app-nav-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-subtle);
            flex-shrink: 0;
        }
        .app-nav-footer .nav-cta {
            display: block;
            width: 100%;
            padding: 11px 16px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-md);
            text-align: center;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }
        .app-nav-footer .nav-cta:hover {
            background: var(--color-primary-hover);
            box-shadow: var(--shadow-glow);
            color: #fff;
            transform: translateY(-1px);
        }

        /* ============ MAIN CONTENT AREA ============ */
        .app-main {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* Mobile nav toggle */
        .mobile-nav-toggle {
            display: none;
            position: fixed;
            top: 14px;
            left: 14px;
            z-index: 1100;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--bg-elevated);
            border: 1px solid var(--border-medium);
            color: var(--text-primary);
            font-size: 1.3rem;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-base);
        }
        .mobile-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        /* ============ CONTAINER ============ */
        .container {
            width: 100%;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .container-wide {
            max-width: 1240px;
        }
        .container-narrow {
            max-width: 820px;
        }

        /* ============ HERO SECTION ============ */
        .hero {
            position: relative;
            padding: 80px 0 90px;
            overflow: hidden;
            background: linear-gradient(180deg, #0D0D26 0%, #12123A 40%, var(--bg-primary) 100%);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            mix-blend-mode: screen;
        }
        .hero-glow {
            position: absolute;
            top: -100px;
            right: -80px;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(124, 92, 252, 0.2) 0%, transparent 70%);
            z-index: 1;
            pointer-events: none;
        }
        .hero-glow-2 {
            position: absolute;
            bottom: -120px;
            left: -60px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(240, 184, 96, 0.12) 0%, transparent 70%);
            z-index: 1;
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 620px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            background: rgba(124, 92, 252, 0.18);
            border: 1px solid rgba(124, 92, 252, 0.35);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--color-primary-hover);
            margin-bottom: 24px;
        }
        .hero-badge .badge-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5);
            }
            50% {
                opacity: 0.7;
                box-shadow: 0 0 0 10px rgba(52, 211, 153, 0);
            }
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 18px;
            line-height: 1.2;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--color-primary-hover), var(--color-accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 520px;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 26px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            white-space: nowrap;
            cursor: pointer;
            border: none;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            box-shadow: 0 4px 18px rgba(124, 92, 252, 0.35);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            box-shadow: 0 6px 28px rgba(124, 92, 252, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid var(--border-medium);
        }
        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary-hover);
            background: rgba(124, 92, 252, 0.06);
        }
        .btn-accent {
            background: var(--color-accent);
            color: #1a1a1a;
            font-weight: 700;
        }
        .btn-accent:hover {
            background: var(--color-accent-hover);
            transform: translateY(-2px);
            color: #1a1a1a;
            box-shadow: 0 6px 24px rgba(240, 184, 96, 0.4);
        }
        .hero-stats-row {
            display: flex;
            gap: 36px;
            margin-top: 40px;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .hero-stat .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 2px;
        }

        /* ============ SECTION COMMON ============ */
        .section {
            padding: 70px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            margin-bottom: 10px;
        }
        .section-header .section-subtitle {
            color: var(--text-muted);
            font-size: 0.95rem;
            max-width: 500px;
            margin: 0 auto;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--color-primary-hover);
            margin-bottom: 8px;
        }

        /* ============ CATEGORY ENTRY CARDS ============ */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            background: var(--bg-card-hover);
        }
        .category-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }
        .category-card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
        }
        .category-card-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            flex: 1;
            margin-bottom: 14px;
        }
        .category-card-body .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-primary-hover);
            transition: gap var(--transition-fast);
        }
        .category-card-body .card-link:hover {
            gap: 10px;
            color: var(--color-accent);
        }

        /* ============ NEWS LIST ============ */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }
        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 18px 24px;
            background: var(--bg-card);
            transition: all var(--transition-fast);
            border-bottom: 1px solid var(--border-subtle);
            cursor: pointer;
        }
        .news-item:last-child {
            border-bottom: none;
        }
        .news-item:hover {
            background: var(--bg-card-hover);
            padding-left: 30px;
        }
        .news-item-thumb {
            width: 64px;
            height: 64px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-elevated);
        }
        .news-item-info {
            flex: 1;
            min-width: 0;
        }
        .news-item-info h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .news-item-info .news-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .news-tag {
            display: inline-block;
            padding: 4px 10px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(124, 92, 252, 0.15);
            color: var(--color-primary-hover);
            flex-shrink: 0;
        }
        .news-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-medium);
        }

        /* ============ FEATURES GRID ============ */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-base);
            text-align: center;
        }
        .feature-card:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-card);
            transform: translateY(-3px);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: rgba(124, 92, 252, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin: 0 auto 16px;
            color: var(--color-primary-hover);
        }
        .feature-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ============ PROCESS / STEPS ============ */
        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            counter-reset: step;
        }
        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding: 24px 28px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            margin-bottom: 16px;
            transition: all var(--transition-fast);
            position: relative;
        }
        .step-item:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-card);
        }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), #5B3FD9);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .step-content h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .step-content p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ============ FAQ ============ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            color: var(--text-primary);
        }
        .faq-question .faq-arrow {
            transition: transform var(--transition-fast);
            font-size: 1.2rem;
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
        }
        .faq-item.open {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 1px rgba(124, 92, 252, 0.15);
        }

        /* ============ CTA SECTION ============ */
        .cta-section {
            background: var(--bg-secondary);
            border-radius: var(--radius-2xl);
            padding: 56px 48px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(124, 92, 252, 0.18) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            color: var(--text-muted);
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
            font-size: 1rem;
        }
        .cta-section .btn {
            position: relative;
            z-index: 1;
        }

        /* ============ FOOTER ============ */
        .app-footer {
            background: var(--nav-bg);
            border-top: 1px solid var(--border-subtle);
            padding: 40px 0 28px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 28px;
        }
        .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand .footer-logo .fl-icon {
            width: 30px;
            height: 30px;
            border-radius: 6px;
            background: linear-gradient(135deg, var(--color-primary), #5B3FD9);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            font-weight: 800;
            color: #fff;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.85rem;
            line-height: 1.6;
        }
        .footer-links h4 {
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }
        .footer-links ul li {
            margin-bottom: 7px;
        }
        .footer-links ul li a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-links ul li a:hover {
            color: var(--color-primary-hover);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: var(--text-weak);
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            :root {
                --nav-width: 200px;
            }
            .container {
                padding: 0 28px;
            }
            h1 {
                font-size: 2.2rem;
            }
            .hero h1 {
                font-size: 2.4rem;
            }
            .hero {
                padding: 50px 0 60px;
            }
            .section {
                padding: 50px 0;
            }
            .category-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
                gap: 18px;
            }
            .features-grid {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
                gap: 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .app-nav-logo .logo-text {
                font-size: 0.9rem;
            }
            .app-nav-menu a {
                padding: 10px 12px;
                font-size: 0.88rem;
                gap: 8px;
            }
        }

        @media (max-width: 768px) {
            .app-nav {
                transform: translateX(-100%);
                width: 260px;
                box-shadow: var(--shadow-lg);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .mobile-nav-toggle {
                display: flex;
            }
            .mobile-overlay {
                display: block;
            }
            .app-main {
                margin-left: 0;
            }
            .container {
                padding: 0 18px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .hero {
                padding: 60px 0 50px;
                text-align: center;
            }
            .hero-content {
                max-width: 100%;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero-desc {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-stats-row {
                justify-content: center;
                gap: 24px;
            }
            .hero-stat {
                text-align: center;
            }
            .section {
                padding: 40px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .category-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .feature-card {
                padding: 20px 16px;
            }
            .news-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 16px 18px;
            }
            .news-item:hover {
                padding-left: 18px;
            }
            .news-item-thumb {
                width: 100%;
                height: 140px;
                border-radius: var(--radius-sm);
            }
            .cta-section {
                padding: 36px 24px;
                border-radius: var(--radius-xl);
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 22px;
                text-align: center;
            }
            .footer-brand .footer-logo {
                justify-content: center;
            }
            .step-item {
                flex-direction: column;
                align-items: center;
                text-align: center;
                gap: 12px;
                padding: 20px 18px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 18px 16px;
            }
        }

        @media (max-width: 520px) {
            .hero {
                padding: 40px 0 36px;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero-desc {
                font-size: 0.9rem;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 10px;
            }
            .hero-buttons .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-stats-row {
                gap: 16px;
            }
            .hero-stat .stat-num {
                font-size: 1.4rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: 11px 20px;
                font-size: 0.88rem;
            }
            .section-header h2 {
                font-size: 1.3rem;
            }
            .cta-section {
                padding: 28px 16px;
            }
            .app-nav {
                width: 240px;
            }
        }

/* roulang page: article */
:root {
            --primary: #5b4fcf;
            --primary-light: #7c6ff7;
            --primary-dark: #4a3fb5;
            --primary-glow: rgba(91, 79, 207, 0.25);
            --accent: #ff6b6b;
            --accent-light: #ff8e8e;
            --accent-dark: #e55a5a;
            --bg: #f5f6fa;
            --surface: #ffffff;
            --surface-alt: #f9fafb;
            --text: #2d3436;
            --text-light: #636e72;
            --text-muted: #9ca3af;
            --border: #e5e7eb;
            --border-light: #f0f1f3;
            --nav-bg: #1a1d2e;
            --nav-bg-hover: #242839;
            --nav-text: #b0b5c4;
            --nav-text-hover: #ffffff;
            --nav-active-bg: rgba(91, 79, 207, 0.3);
            --nav-active-text: #ffffff;
            --nav-width: 240px;
            --nav-width-collapsed: 72px;
            --topbar-height: 60px;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --radius-xl: 24px;
            --shadow-xs: 0 1px 3px rgba(0,0,0,0.04);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);
            --transition-fast: 0.18s ease;
            --transition: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

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

        /* ============ TOP BAR (mobile) ============ */
        .topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--topbar-height);
            background: var(--nav-bg);
            z-index: 1100;
            align-items: center;
            padding: 0 16px;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0,0,0,0.25);
        }
        .topbar-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #fff;
            font-weight: 700;
            font-size: 17px;
            text-decoration: none;
        }
        .topbar-logo .logo-icon {
            width: 34px;
            height: 34px;
            background: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #fff;
            flex-shrink: 0;
        }
        .topbar-burger {
            width: 38px;
            height: 38px;
            background: transparent;
            border: 1px solid rgba(255,255,255,0.2);
            border-radius: 10px;
            color: #fff;
            font-size: 20px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
        }
        .topbar-burger:hover {
            background: rgba(255,255,255,0.1);
            border-color: rgba(255,255,255,0.35);
        }

        /* ============ SIDEBAR NAV ============ */
        .app-nav {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--nav-width);
            background: var(--nav-bg);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            border-right: 1px solid rgba(255,255,255,0.06);
            transition: transform var(--transition-slow), width var(--transition-slow);
            overflow-y: auto;
            overflow-x: hidden;
        }
        .app-nav-logo {
            padding: 22px 20px 18px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            flex-shrink: 0;
        }
        .app-nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            text-decoration: none;
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 0.5px;
            white-space: nowrap;
            overflow: hidden;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 4px 14px var(--primary-glow);
        }
        .logo-text {
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .app-nav-menu {
            flex: 1;
            padding: 12px 10px;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .app-nav-menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 14px;
            border-radius: 10px;
            color: var(--nav-text);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition-fast);
            white-space: nowrap;
            overflow: hidden;
            text-decoration: none;
            position: relative;
        }
        .app-nav-menu a:hover {
            background: var(--nav-bg-hover);
            color: var(--nav-text-hover);
        }
        .app-nav-menu a.active {
            background: var(--nav-active-bg);
            color: var(--nav-active-text);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--primary-light);
        }
        .app-nav-menu a .nav-icon {
            font-size: 18px;
            flex-shrink: 0;
            width: 24px;
            text-align: center;
        }
        .app-nav-footer {
            padding: 14px 14px 20px;
            flex-shrink: 0;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .nav-cta {
            display: block;
            text-align: center;
            padding: 11px 20px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            border-radius: 10px;
            font-weight: 600;
            font-size: 14px;
            text-decoration: none;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 14px var(--primary-glow);
            white-space: nowrap;
        }
        .nav-cta:hover {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            box-shadow: 0 6px 20px rgba(91, 79, 207, 0.4);
            transform: translateY(-1px);
            color: #fff;
            text-decoration: none;
        }

        /* ============ MAIN CONTENT ============ */
        .main-wrapper {
            margin-left: var(--nav-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            transition: margin-left var(--transition-slow);
        }
        .main-content {
            flex: 1;
            padding: 0;
        }

        /* ============ ARTICLE BANNER ============ */
        .article-banner {
            position: relative;
            min-height: 220px;
            background: linear-gradient(160deg, #1a1d2e 0%, #2d3154 40%, #3a3560 100%);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: flex-end;
            padding: 40px 40px 28px;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(26,29,46,0.55) 0%, rgba(26,29,46,0.85) 100%);
            z-index: 1;
        }
        .article-banner-content {
            position: relative;
            z-index: 2;
            max-width: 860px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255,255,255,0.7);
            margin-bottom: 10px;
        }
        .breadcrumb a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .breadcrumb .sep {
            color: rgba(255,255,255,0.4);
            font-size: 10px;
        }
        .breadcrumb .current {
            color: rgba(255,255,255,0.95);
            font-weight: 500;
        }
        .article-category-badge {
            display: inline-block;
            padding: 5px 14px;
            background: var(--primary);
            color: #fff;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        /* ============ ARTICLE CONTAINER ============ */
        .article-container {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 32px 20px;
            position: relative;
        }
        .article-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            margin-top: -40px;
            position: relative;
            z-index: 5;
            padding: 40px 44px;
            overflow: hidden;
        }
        .article-card h1 {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-light);
            font-size: 14px;
            color: var(--text-light);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-icon {
            font-size: 15px;
        }
        .article-meta .meta-cat {
            padding: 4px 12px;
            background: #f0edff;
            color: var(--primary-dark);
            border-radius: 16px;
            font-weight: 600;
            font-size: 12px;
        }
        .article-featured-image {
            margin: 0 -44px 28px;
            overflow: hidden;
        }
        .article-featured-image img {
            width: 100%;
            display: block;
            max-height: 480px;
            object-fit: cover;
        }
        .article-body {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 1.45rem;
            font-weight: 700;
            margin: 32px 0 14px;
            color: var(--text);
            padding-left: 14px;
            border-left: 4px solid var(--primary);
        }
        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 24px 0 10px;
            color: var(--text);
        }
        .article-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin: 20px 0 8px;
            color: var(--text-light);
        }
        .article-body p {
            margin-bottom: 16px;
        }
        .article-body ul, .article-body ol {
            margin: 8px 0 16px 20px;
            padding-left: 8px;
        }
        .article-body li {
            margin-bottom: 7px;
        }
        .article-body blockquote {
            margin: 20px 0;
            padding: 16px 22px;
            background: var(--surface-alt);
            border-left: 4px solid var(--primary-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body img {
            border-radius: var(--radius);
            margin: 16px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-body code {
            background: #f1f3f5;
            padding: 2px 7px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: #e55a5a;
        }
        .article-body pre {
            background: #1e2235;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 16px 0;
            font-size: 14px;
            line-height: 1.7;
        }
        .article-body pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            font-size: inherit;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 16px 0;
            font-size: 14px;
        }
        .article-body table th,
        .article-body table td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-body table th {
            background: var(--surface-alt);
            font-weight: 600;
        }

        /* ============ ARTICLE FOOTER ACTIONS ============ */
        .article-actions {
            margin-top: 28px;
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            flex: 1;
            min-width: 200px;
        }
        .article-tag {
            padding: 5px 12px;
            background: #f0f1f5;
            border-radius: 16px;
            font-size: 12px;
            color: var(--text-light);
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .article-tag:hover {
            background: #e2e4ec;
            color: var(--text);
        }
        .share-buttons {
            display: flex;
            gap: 8px;
        }
        .share-btn {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            border: 1px solid var(--border);
            background: var(--surface);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all var(--transition-fast);
            font-size: 16px;
            color: var(--text-light);
            text-decoration: none;
        }
        .share-btn:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* ============ RELATED POSTS ============ */
        .related-section {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 32px 10px;
        }
        .related-section h2 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .related-section h2::before {
            content: '';
            display: inline-block;
            width: 4px;
            height: 22px;
            background: var(--primary);
            border-radius: 2px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }
        .related-card {
            background: var(--surface);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-xs);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            text-decoration: none;
            color: inherit;
        }
        .related-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-3px);
        }
        .related-card-image {
            height: 170px;
            overflow: hidden;
            background: #eef0f5;
        }
        .related-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .related-card:hover .related-card-image img {
            transform: scale(1.04);
        }
        .related-card-body {
            padding: 16px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .related-card-body h3 {
            font-size: 15px;
            font-weight: 600;
            line-height: 1.45;
            color: var(--text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-body .rc-date {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* ============ CTA SECTION ============ */
        .cta-section {
            max-width: 900px;
            margin: 30px auto 40px;
            padding: 0 32px;
        }
        .cta-block {
            background: linear-gradient(135deg, #1e2235 0%, #2d3154 100%);
            border-radius: var(--radius-lg);
            padding: 36px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -40px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cta-block h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
        }
        .cta-block p {
            color: rgba(255,255,255,0.75);
            margin-bottom: 18px;
            font-size: 15px;
            position: relative;
            z-index: 1;
        }
        .cta-block .cta-btn {
            display: inline-block;
            padding: 12px 28px;
            background: var(--accent);
            color: #fff;
            border-radius: 28px;
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            transition: all var(--transition-fast);
            position: relative;
            z-index: 1;
            box-shadow: 0 4px 16px rgba(255,107,107,0.35);
        }
        .cta-block .cta-btn:hover {
            background: var(--accent-light);
            box-shadow: 0 6px 22px rgba(255,107,107,0.5);
            transform: translateY(-2px);
            color: #fff;
            text-decoration: none;
        }

        /* ============ NOT FOUND ============ */
        .not-found-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            margin-top: -40px;
            position: relative;
            z-index: 5;
            padding: 60px 44px;
            text-align: center;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
        }
        .not-found-card .nf-icon {
            font-size: 64px;
            margin-bottom: 16px;
        }
        .not-found-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .not-found-card p {
            color: var(--text-light);
            margin-bottom: 22px;
        }
        .not-found-card .nf-btn {
            display: inline-block;
            padding: 11px 26px;
            background: var(--primary);
            color: #fff;
            border-radius: 24px;
            font-weight: 600;
            font-size: 14px;
            text-decoration: none;
            transition: all var(--transition-fast);
        }
        .not-found-card .nf-btn:hover {
            background: var(--primary-dark);
            box-shadow: var(--shadow);
            transform: translateY(-1px);
            color: #fff;
            text-decoration: none;
        }

        /* ============ FOOTER ============ */
        .app-footer {
            background: #1a1d2e;
            color: rgba(255,255,255,0.75);
            padding: 40px 32px 24px;
            margin-top: auto;
        }
        .app-footer .container {
            max-width: 1100px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .footer-brand p {
            margin-top: 10px;
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.55);
            max-width: 320px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .fl-icon {
            width: 34px;
            height: 34px;
            background: var(--primary);
            border-radius: 9px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            color: #fff;
        }
        .footer-links h4 {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.55);
            font-size: 14px;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: #fff;
            text-decoration: none;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 18px;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }

        /* ============ OVERLAY ============ */
        .nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            transition: opacity var(--transition);
        }
        .nav-overlay.visible {
            display: block;
            opacity: 1;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .topbar {
                display: flex;
            }
            .app-nav {
                transform: translateX(-100%);
                top: var(--topbar-height);
                bottom: 0;
                width: 280px;
                z-index: 1050;
                border-radius: 0 0 0 0;
                box-shadow: var(--shadow-xl);
            }
            .app-nav.open {
                transform: translateX(0);
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--topbar-height);
            }
            .article-banner {
                min-height: 160px;
                padding: 28px 24px 20px;
            }
            .article-card {
                margin-top: -30px;
                padding: 28px 24px;
                border-radius: var(--radius);
            }
            .article-card h1 {
                font-size: 1.5rem;
            }
            .article-featured-image {
                margin: 0 -24px 22px;
            }
            .article-body {
                font-size: 16px;
            }
            .article-container {
                padding: 0 16px 16px;
            }
            .related-section {
                padding: 30px 16px 10px;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .cta-section {
                padding: 0 16px;
            }
            .app-footer {
                padding: 32px 20px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 640px) {
            .article-banner {
                min-height: 130px;
                padding: 20px 16px 16px;
            }
            .article-card {
                margin-top: -24px;
                padding: 22px 16px;
                border-radius: var(--radius-sm);
            }
            .article-card h1 {
                font-size: 1.3rem;
            }
            .article-featured-image {
                margin: 0 -16px 18px;
            }
            .article-body {
                font-size: 15px;
                line-height: 1.8;
            }
            .article-body h2 {
                font-size: 1.2rem;
            }
            .article-meta {
                gap: 10px;
                font-size: 13px;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .related-card-image {
                height: 150px;
            }
            .cta-block {
                padding: 26px 20px;
            }
            .cta-block h3 {
                font-size: 1.15rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-actions {
                flex-direction: column;
                align-items: flex-start;
            }
            .not-found-card {
                padding: 40px 20px;
                margin-top: -20px;
            }
        }

/* roulang page: category1 */
/* ============ 设计变量 ============ */
        :root {
            --sidebar-width: 250px;
            --sidebar-bg: #0f172a;
            --sidebar-text: #cbd5e1;
            --sidebar-hover: #1e293b;
            --sidebar-active: #1a2332;
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #818cf8;
            --primary-glow: rgba(99, 102, 241, 0.25);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fbbf24;
            --bg: #f1f5f9;
            --surface: #ffffff;
            --surface-alt: #f8fafc;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.13), 0 8px 20px rgba(0, 0, 0, 0.06);
            --transition-fast: 0.18s ease;
            --transition: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
            --header-height-mobile: 60px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            font-size: inherit;
        }

        input,
        select,
        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: var(--text);
        }

        /* ============ 容器 ============ */
        .container {
            width: 100%;
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ============ 主布局：左侧导航 + 右侧内容 ============ */
        .app-layout {
            display: flex;
            min-height: 100vh;
        }

        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--sidebar-bg);
            z-index: 100;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            overflow-x: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 2px 0 24px rgba(0, 0, 0, 0.18);
        }

        .app-main {
            flex: 1;
            margin-left: var(--sidebar-width);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            transition: margin-left var(--transition);
        }

        .app-main-content {
            flex: 1;
        }

        /* ============ 侧边栏导航 ============ */
        .app-nav {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 20px 0;
        }

        .app-nav-logo {
            padding: 8px 20px 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 16px;
        }

        .app-nav-logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #ffffff;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.15rem;
            letter-spacing: 0.02em;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), #8b5cf6);
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            flex-shrink: 0;
            box-shadow: 0 4px 14px var(--primary-glow);
        }

        .logo-text {
            white-space: nowrap;
            color: #f1f5f9;
        }

        .app-nav-menu {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 0 12px;
        }

        .app-nav-menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 14px;
            border-radius: var(--radius-sm);
            color: var(--sidebar-text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            position: relative;
            text-decoration: none;
        }

        .app-nav-menu a:hover {
            background: var(--sidebar-hover);
            color: #e2e8f0;
        }

        .app-nav-menu a.active {
            background: var(--sidebar-active);
            color: #ffffff;
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--primary-light);
        }

        .app-nav-menu a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 22px;
            background: var(--primary-light);
            border-radius: 0 3px 3px 0;
        }

        .nav-icon {
            font-size: 1.15rem;
            width: 24px;
            text-align: center;
            flex-shrink: 0;
        }

        .app-nav-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: auto;
        }

        .nav-cta {
            display: block;
            width: 100%;
            padding: 12px 18px;
            text-align: center;
            background: linear-gradient(135deg, var(--accent), #e5980b);
            color: #1a1a1a;
            font-weight: 700;
            border-radius: var(--radius);
            font-size: 0.95rem;
            transition: all var(--transition);
            text-decoration: none;
            letter-spacing: 0.02em;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
        }

        .nav-cta:hover {
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(245, 158, 11, 0.4);
        }

        /* ============ 移动端顶部栏 ============ */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height-mobile);
            background: var(--sidebar-bg);
            z-index: 99;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }

        .mobile-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            text-decoration: none;
        }

        .mobile-logo .logo-icon {
            width: 34px;
            height: 34px;
            font-size: 1rem;
        }

        .hamburger-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: none;
            border: none;
            cursor: pointer;
            z-index: 101;
        }

        .hamburger-btn span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #e2e8f0;
            border-radius: 2px;
            transition: all var(--transition-fast);
            transform-origin: center;
        }

        .hamburger-btn.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .hamburger-btn.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* 侧边栏遮罩 */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 98;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }

        .sidebar-overlay.visible {
            opacity: 1;
            pointer-events: auto;
        }

        /* ============ 板块间距 ============ */
        .section {
            padding: 64px 0;
        }

        .section-sm {
            padding: 40px 0;
        }

        .section-lg {
            padding: 80px 0;
        }

        .section-tight {
            padding: 32px 0;
        }

        /* ============ 分类页 Banner ============ */
        .category-banner {
            position: relative;
            padding: 64px 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.7) 50%, rgba(15, 23, 42, 0.8) 100%);
            z-index: 1;
        }

        .category-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: linear-gradient(to top, var(--bg), transparent);
            z-index: 2;
        }

        .category-banner .container {
            position: relative;
            z-index: 3;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 16px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: #ffffff;
        }

        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.45);
            font-size: 0.75rem;
        }

        .breadcrumb .current {
            color: var(--accent-light);
            font-weight: 600;
        }

        .category-banner-title {
            font-size: 2.5rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: 0.03em;
            margin-bottom: 12px;
        }

        .category-banner-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            line-height: 1.7;
        }

        .category-banner-stats {
            display: flex;
            gap: 28px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .cat-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, 0.9);
            font-weight: 600;
            font-size: 0.95rem;
        }

        .cat-stat-num {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-light);
        }

        /* ============ 筛选标签栏 ============ */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            padding: 20px 0;
            border-bottom: 1px solid var(--border);
            margin-bottom: 8px;
        }

        .filter-label {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-right: 4px;
            white-space: nowrap;
        }

        .filter-tag {
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.88rem;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition-fast);
            border: 1.5px solid var(--border);
            background: var(--surface);
            color: var(--text-secondary);
            white-space: nowrap;
            user-select: none;
        }

        .filter-tag:hover {
            border-color: var(--primary-light);
            color: var(--primary);
            background: #f5f3ff;
        }

        .filter-tag.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
            box-shadow: 0 4px 12px var(--primary-glow);
        }

        /* ============ 文章卡片网格 ============ */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            padding: 32px 0;
        }

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

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

        .article-card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--surface-alt);
        }

        .article-card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .article-card:hover .article-card-img-wrap img {
            transform: scale(1.06);
        }

        .article-card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 5px 12px;
            border-radius: 14px;
            font-size: 0.78rem;
            font-weight: 600;
            background: rgba(99, 102, 241, 0.9);
            color: #fff;
            backdrop-filter: blur(4px);
            letter-spacing: 0.02em;
            z-index: 2;
        }

        .article-card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-card-title {
            font-size: 1.08rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.45;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition-fast);
        }

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

        .article-card-excerpt {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        .article-card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .article-card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
            margin-top: 10px;
            transition: gap var(--transition-fast);
        }

        .article-card-link:hover {
            gap: 10px;
        }

        .article-card-link .arrow {
            transition: transform var(--transition-fast);
        }

        .article-card-link:hover .arrow {
            transform: translateX(3px);
        }

        /* ============ 精选攻略大卡 ============ */
        .featured-section {
            padding: 48px 0 56px;
        }

        .featured-section .section-title {
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-title .icon-deco {
            width: 6px;
            height: 26px;
            background: var(--primary);
            border-radius: 3px;
            display: inline-block;
        }

        .featured-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            background: var(--surface);
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }

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

        .featured-card-img {
            aspect-ratio: 4 / 3;
            overflow: hidden;
            background: var(--surface-alt);
        }

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

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

        .featured-card-body {
            padding: 32px 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .featured-badge {
            display: inline-block;
            padding: 6px 14px;
            background: linear-gradient(135deg, var(--accent), #e5980b);
            color: #1a1a1a;
            font-weight: 700;
            font-size: 0.8rem;
            border-radius: 14px;
            margin-bottom: 14px;
            letter-spacing: 0.03em;
            width: fit-content;
        }

        .featured-card-body h3 {
            font-size: 1.4rem;
            font-weight: 800;
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .featured-card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 18px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.93rem;
            transition: all var(--transition);
            text-decoration: none;
            letter-spacing: 0.02em;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px var(--primary-glow);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 22px var(--primary-glow);
            transform: translateY(-2px);
        }

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

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #f5f3ff;
        }

        .btn-accent {
            background: linear-gradient(135deg, var(--accent), #e5980b);
            color: #1a1a1a;
            font-weight: 700;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
        }

        .btn-accent:hover {
            box-shadow: 0 8px 22px rgba(245, 158, 11, 0.45);
            transform: translateY(-2px);
        }

        /* ============ 数据统计条 ============ */
        .stats-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            padding: 32px 0 40px;
        }

        .stat-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }

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

        .stat-card .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 0.02em;
            line-height: 1.2;
        }

        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 6px;
            font-weight: 500;
        }

        .stat-card .stat-icon {
            font-size: 1.8rem;
            margin-bottom: 8px;
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: var(--surface-alt);
            border-radius: var(--radius-xl);
            padding: 48px 32px;
            margin: 16px 0 40px;
        }

        .faq-section .section-title {
            text-align: center;
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 32px;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 760px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 20px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            cursor: default;
        }

        .faq-item:hover {
            box-shadow: var(--shadow);
            border-color: var(--primary-light);
        }

        .faq-item summary {
            font-weight: 700;
            font-size: 1.02rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            color: var(--text);
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-arrow {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform var(--transition);
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .faq-item[open] .faq-arrow {
            transform: rotate(180deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-answer {
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
            color: var(--text-secondary);
            font-size: 0.93rem;
            line-height: 1.7;
        }

        /* ============ CTA 板块 ============ */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #1a1a2e 100%);
            border-radius: var(--radius-xl);
            padding: 56px 40px;
            text-align: center;
            margin: 24px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section>* {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 12px;
            letter-spacing: 0.03em;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.75);
            font-size: 1.05rem;
            margin-bottom: 28px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-section .btn-accent {
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: 28px;
            letter-spacing: 0.04em;
        }

        /* ============ 页脚 ============ */
        .app-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 48px 0 28px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .fl-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), #8b5cf6);
            color: #fff;
            font-weight: 800;
            font-size: 1rem;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: #94a3b8;
            line-height: 1.7;
        }

        .footer-links h4 {
            color: #ffffff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.03em;
        }

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

        .footer-links a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: #e2e8f0;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }

        /* ============ 空状态 / 加载更多 ============ */
        .load-more-wrap {
            text-align: center;
            padding: 16px 0 40px;
        }

        .btn-load-more {
            padding: 12px 36px;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.93rem;
            border: 2px solid var(--border);
            background: var(--surface);
            color: var(--text);
            cursor: pointer;
            transition: all var(--transition);
            letter-spacing: 0.02em;
        }

        .btn-load-more:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #f5f3ff;
            box-shadow: var(--shadow);
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1200px) {
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stats-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .featured-card {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .articles-grid {
                gap: 16px;
            }
            .category-banner-title {
                font-size: 2rem;
            }
            .featured-card {
                grid-template-columns: 1fr;
            }
            .featured-card-img {
                aspect-ratio: 16 / 9;
                max-height: 280px;
            }
            .featured-card-body {
                padding: 24px 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .app-sidebar {
                transform: translateX(-100%);
                width: 270px;
                box-shadow: none;
                z-index: 100;
            }
            .app-sidebar.open {
                transform: translateX(0);
                box-shadow: 4px 0 32px rgba(0, 0, 0, 0.35);
            }
            .sidebar-overlay {
                display: block;
            }
            .app-main {
                margin-left: 0;
                padding-top: var(--header-height-mobile);
            }
            .mobile-header {
                display: flex;
            }
            .articles-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
                padding: 20px 0;
            }
            .stats-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
                padding: 20px 0 28px;
            }
            .category-banner {
                padding: 40px 0;
                min-height: 220px;
            }
            .category-banner-title {
                font-size: 1.6rem;
            }
            .category-banner-desc {
                font-size: 0.95rem;
            }
            .category-banner-stats {
                gap: 16px;
            }
            .cat-stat-num {
                font-size: 1.15rem;
            }
            .section {
                padding: 40px 0;
            }
            .section-lg {
                padding: 48px 0;
            }
            .cta-section {
                padding: 36px 20px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .faq-section {
                padding: 32px 16px;
            }
            .faq-item {
                padding: 16px 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .filter-bar {
                gap: 8px;
            }
            .filter-tag {
                padding: 6px 12px;
                font-size: 0.8rem;
            }
            .featured-card-body h3 {
                font-size: 1.15rem;
            }
            .container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stats-strip {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .category-banner-title {
                font-size: 1.35rem;
            }
            .category-banner {
                min-height: 180px;
                padding: 32px 0;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .category-banner-stats {
                flex-direction: column;
                gap: 8px;
            }
            .filter-bar {
                gap: 6px;
            }
            .filter-tag {
                padding: 5px 10px;
                font-size: 0.75rem;
                border-radius: 16px;
            }
            .stat-card {
                padding: 16px 12px;
            }
            .stat-card .stat-num {
                font-size: 1.6rem;
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .cta-section p {
                font-size: 0.9rem;
            }
            .btn {
                font-size: 0.85rem;
                padding: 10px 18px;
            }
            .app-sidebar {
                width: 260px;
            }
            .faq-item summary {
                font-size: 0.93rem;
            }
        }

        /* ============ 焦点可见轮廓（可访问性） ============ */
        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 2.5px solid var(--primary-light);
            outline-offset: 3px;
            border-radius: 3px;
        }

        /* ============ 选择文本样式 ============ */
        ::selection {
            background: rgba(99, 102, 241, 0.2);
            color: var(--text);
        }