/* roulang page: index */
:root {
            --color-primary: #1e1b4b;
            --color-primary-light: #4f46e5;
            --color-accent: #f59e0b;
            --color-accent-hover: #d97706;
            --color-bg: #f8fafc;
            --color-bg-alt: #f1f5f9;
            --color-text: #0f172a;
            --color-text-muted: #64748b;
            --color-border: #e2e8f0;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
            --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
            --transition: 0.2s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', Helvetica, Arial, sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--color-primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        @media (max-width: 640px) {
            .container {
                padding: 0 1rem;
            }
        }
        /* header / nav */
        .site-header {
            background: rgba(30, 27, 75, 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: background var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }
        .site-logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            white-space: nowrap;
        }
        .site-logo i {
            color: var(--color-accent);
            font-size: 1.5rem;
        }
        .site-logo span {
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
        }
        .nav-list a {
            color: rgba(255,255,255,0.75);
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover,
        .nav-list a.active {
            color: #fff;
            background: rgba(255,255,255,0.1);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--color-accent) !important;
            color: #1e1b4b !important;
            font-weight: 600 !important;
            padding: 0.5rem 1.25rem !important;
            border-radius: var(--radius-sm) !important;
            margin-left: 0.5rem;
        }
        .nav-cta:hover {
            background: var(--color-accent-hover) !important;
            color: #1e1b4b !important;
            transform: translateY(-1px);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.25rem;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-list {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: rgba(30, 27, 75, 0.98);
                flex-direction: column;
                padding: 1rem 1.5rem 1.5rem;
                gap: 0.25rem;
                border-bottom: 1px solid rgba(255,255,255,0.08);
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                width: 100%;
                padding: 0.75rem 1rem;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-list a.active {
                background: rgba(255,255,255,0.1);
                border-left: 3px solid var(--color-accent);
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 0.5rem;
                text-align: center;
            }
        }
        /* hero */
        .hero {
            min-height: 92vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            background: linear-gradient(135deg, #0f0d2e 0%, #1e1b4b 50%, #1a1a3e 100%);
            overflow: hidden;
            padding-top: 70px;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(79,70,229,0.25) 0%, transparent 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            padding: 2rem 1.5rem;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(245,158,11,0.15);
            border: 1px solid rgba(245,158,11,0.3);
            color: #fbbf24;
            padding: 0.4rem 1.2rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.5rem;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin-bottom: 1.2rem;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.7);
            max-width: 600px;
            margin: 0 auto 2rem;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 2rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
        }
        .btn-primary {
            background: var(--color-accent);
            color: #1e1b4b;
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: #1e1b4b;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(245,158,11,0.3);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.25);
        }
        .btn-outline:hover {
            border-color: rgba(255,255,255,0.6);
            color: #fff;
            transform: translateY(-2px);
        }
        .hero-stats {
            display: flex;
            gap: 2.5rem;
            justify-content: center;
            margin-top: 3rem;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stat .num span {
            color: var(--color-accent);
        }
        .hero-stat .label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            margin-top: 0.25rem;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 1.5rem;
            }
            .hero-stat .num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }
        /* sections */
        .section {
            padding: 5rem 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.3px;
        }
        .section-title p {
            color: var(--color-text-muted);
            margin-top: 0.6rem;
            font-size: 1.05rem;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .section-title .overline {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--color-accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 0.5rem;
        }
        @media (max-width: 640px) {
            .section {
                padding: 3rem 0;
            }
            .section-title h2 {
                font-size: 1.5rem;
            }
        }
        /* features grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .feature-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
            border: 1px solid var(--color-border);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, #eef2ff, #e0e7ff);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-size: 1.5rem;
            color: var(--color-primary-light);
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--color-primary);
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }
        /* category cards */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: #fff;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
            border: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }
        .category-card .card-img {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .category-card .card-img .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15,13,46,0.6) 0%, transparent 60%);
        }
        .category-card .card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-body .tag {
            display: inline-block;
            background: var(--color-accent);
            color: #1e1b4b;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 50px;
            align-self: flex-start;
            margin-bottom: 0.75rem;
        }
        .category-card .card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 0.5rem;
        }
        .category-card .card-body p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            flex: 1;
        }
        .category-card .card-body .btn-link {
            align-self: flex-start;
            margin-top: 1rem;
            color: var(--color-primary-light);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .category-card .card-body .btn-link:hover {
            color: var(--color-accent);
        }
        @media (max-width: 768px) {
            .category-grid {
                grid-template-columns: 1fr;
            }
        }
        /* posts list */
        .posts-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .post-item {
            background: #fff;
            border-radius: var(--radius-md);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .post-item:hover {
            box-shadow: var(--shadow-md);
            border-color: transparent;
            transform: translateY(-2px);
        }
        .post-item .meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin-bottom: 0.5rem;
        }
        .post-item .meta .cat {
            background: #eef2ff;
            color: var(--color-primary-light);
            padding: 0.15rem 0.6rem;
            border-radius: 50px;
            font-weight: 500;
        }
        .post-item h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 0.4rem;
            line-height: 1.5;
        }
        .post-item h3 a:hover {
            color: var(--color-primary-light);
        }
        .post-item p {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-item .read-more {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-primary-light);
            margin-top: 0.75rem;
        }
        .post-item .read-more:hover {
            color: var(--color-accent);
        }
        .empty-posts {
            grid-column: 1 / -1;
            text-align: center;
            padding: 3rem 1.5rem;
            color: var(--color-text-muted);
            font-size: 1rem;
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
        }
        @media (max-width: 768px) {
            .posts-list {
                grid-template-columns: 1fr;
            }
        }
        /* stats counter */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .stat-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 2rem 1rem;
            text-align: center;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }
        .stat-card .num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
        }
        .stat-card .num span {
            color: var(--color-accent);
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-top: 0.4rem;
        }
        .stat-card .icon {
            font-size: 1.8rem;
            color: var(--color-primary-light);
            margin-bottom: 0.75rem;
            opacity: 0.6;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }
        /* faq */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(79,70,229,0.2);
        }
        .faq-question {
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--color-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: #f8fafc;
        }
        .faq-question i {
            color: var(--color-primary-light);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 1.5rem 1.2rem;
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        /* cta */
        .cta-section {
            background: linear-gradient(135deg, #1e1b4b 0%, #2d2a6e 100%);
            padding: 4rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            color: rgba(255,255,255,0.7);
            font-size: 1.05rem;
            max-width: 520px;
            margin: 0 auto 2rem;
        }
        .cta-section .btn {
            font-size: 1.05rem;
            padding: 0.9rem 2.5rem;
        }
        /* footer */
        .site-footer {
            background: #0f0d2e;
            color: rgba(255,255,255,0.6);
            padding: 3.5rem 0 1.5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }
        .footer-brand .logo i {
            color: var(--color-accent);
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-col ul a {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.5);
            transition: color var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--color-accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.82rem;
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a:hover {
            color: var(--color-accent);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        /* utility */
        .text-accent {
            color: var(--color-accent);
        }
        .bg-accent {
            background: var(--color-accent);
        }
        .divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--color-accent), var(--color-primary-light));
            border-radius: 2px;
            margin: 0.75rem auto 0;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }
        .focus-outline:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

/* roulang page: article */
:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #a5b4fc;
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --accent: #ec4899;
            --bg: #0f0f1a;
            --bg-card: #1a1a2e;
            --bg-elevated: #25253d;
            --text: #f1f5f9;
            --text-muted: #94a3b8;
            --text-dim: #64748b;
            --border: rgba(99, 102, 241, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 16px 48px rgba(99, 102, 241, 0.2);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
        }
        input,
        textarea {
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 15, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .site-logo i {
            color: var(--primary-light);
            font-size: 1.5rem;
        }
        .site-logo span {
            background: linear-gradient(135deg, #fff 40%, var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            color: #fff;
            background: rgba(99, 102, 241, 0.1);
        }
        .nav-list a.active {
            color: #fff;
            background: rgba(99, 102, 241, 0.18);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 6px;
            background: var(--primary);
        }
        .nav-list a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
        }
        .nav-list a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
        }
        .nav-list a.nav-cta i {
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: #fff;
            padding: 8px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(99, 102, 241, 0.1);
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .nav-list {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(15, 15, 26, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 32px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-bottom: 1px solid var(--border);
                max-height: calc(100vh - 72px);
                overflow-y: auto;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-list a {
                width: 100%;
                padding: 14px 18px;
                font-size: 1rem;
            }
            .nav-list a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
        }
        .article-hero {
            padding: 140px 0 60px;
            position: relative;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.92), rgba(30, 27, 75, 0.85)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(99, 102, 241, 0.2);
            border: 1px solid rgba(99, 102, 241, 0.25);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.82rem;
            color: var(--primary-light);
            font-weight: 500;
            margin-bottom: 20px;
        }
        .article-badge i {
            font-size: 0.7rem;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -1px;
            color: #fff;
            max-width: 880px;
            margin-bottom: 20px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 28px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            color: var(--primary-light);
            font-size: 0.85rem;
        }
        @media (max-width: 768px) {
            .article-hero {
                padding: 120px 0 40px;
            }
            .article-hero h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                gap: 12px 20px;
                font-size: 0.82rem;
            }
        }
        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 1.5rem;
            }
        }
        .article-main {
            padding: 48px 0 60px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 40px;
            }
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px 44px;
            border: 1px solid var(--border);
        }
        @media (max-width: 768px) {
            .article-body {
                padding: 24px 20px;
            }
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body .content h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin: 36px 0 16px;
            color: #fff;
            letter-spacing: -0.3px;
        }
        .article-body .content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 28px 0 12px;
            color: #fff;
        }
        .article-body .content p {
            margin-bottom: 18px;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 16px 0 20px;
            padding-left: 24px;
        }
        .article-body .content li {
            margin-bottom: 8px;
        }
        .article-body .content a {
            color: var(--primary-light);
            border-bottom: 1px solid rgba(99, 102, 241, 0.3);
        }
        .article-body .content a:hover {
            color: var(--secondary-light);
            border-color: var(--secondary-light);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: rgba(99, 102, 241, 0.06);
            padding: 16px 24px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-body .content code {
            background: rgba(99, 102, 241, 0.1);
            padding: 2px 8px;
            border-radius: 6px;
            font-size: 0.9em;
        }
        .article-body .content pre {
            background: var(--bg-elevated);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            overflow-x: auto;
            margin: 20px 0;
            border: 1px solid var(--border);
        }
        .article-body .content pre code {
            background: none;
            padding: 0;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 36px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
        }
        .article-tags .tag {
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.82rem;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary-light);
            border: 1px solid rgba(99, 102, 241, 0.15);
            transition: var(--transition);
        }
        .article-tags .tag:hover {
            background: rgba(99, 102, 241, 0.2);
            border-color: var(--primary);
        }
        .article-nav {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
        }
        .article-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 20px;
            border-radius: var(--radius-sm);
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: var(--transition);
            max-width: 48%;
        }
        .article-nav a:hover {
            border-color: var(--primary);
            color: #fff;
            background: rgba(99, 102, 241, 0.08);
            transform: translateY(-2px);
        }
        .article-nav a i {
            color: var(--primary-light);
        }
        .article-nav a:last-child {
            text-align: right;
            flex-direction: row-reverse;
        }
        @media (max-width: 520px) {
            .article-nav {
                flex-direction: column;
            }
            .article-nav a {
                max-width: 100%;
            }
        }
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i {
            color: var(--primary-light);
        }
        .sidebar-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-list li a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            background: rgba(99, 102, 241, 0.04);
            transition: var(--transition);
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .sidebar-list li a:hover {
            background: rgba(99, 102, 241, 0.1);
            color: #fff;
            transform: translateX(4px);
        }
        .sidebar-list li a i {
            color: var(--primary-light);
            font-size: 0.8rem;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(236, 72, 153, 0.08));
            border: 1px solid rgba(99, 102, 241, 0.2);
            text-align: center;
            padding: 32px 24px;
        }
        .sidebar-cta h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .sidebar-cta p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 18px;
        }
        .sidebar-cta .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-weight: 600;
            font-size: 0.92rem;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
            transition: var(--transition);
        }
        .sidebar-cta .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
        }
        .not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found i {
            font-size: 4rem;
            color: var(--primary-light);
            margin-bottom: 24px;
            display: block;
        }
        .not-found h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .not-found p {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-bottom: 28px;
        }
        .not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
            transition: var(--transition);
        }
        .not-found .btn-back:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
        }
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg-card);
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            letter-spacing: -0.5px;
        }
        .related-section .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 36px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-6px);
            border-color: rgba(99, 102, 241, 0.3);
            box-shadow: var(--shadow-hover);
        }
        .related-card .card-img {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-elevated);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 18px 20px 22px;
        }
        .related-card .card-body .card-cat {
            font-size: 0.75rem;
            color: var(--primary-light);
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card .card-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #fff;
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 12px;
            font-size: 0.78rem;
            color: var(--text-dim);
        }
        .related-card .card-body .card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .cta-section {
            padding: 60px 0;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(236, 72, 153, 0.04));
            border-top: 1px solid var(--border);
        }
        .cta-section .cta-box {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.06));
            border: 1px solid rgba(99, 102, 241, 0.2);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            text-align: center;
        }
        @media (max-width: 768px) {
            .cta-section .cta-box {
                padding: 32px 24px;
            }
        }
        .cta-section .cta-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .cta-section .cta-box p {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-box .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .cta-section .cta-box .btn-primary {
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-section .cta-box .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
        }
        .cta-section .cta-box .btn-secondary {
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            background: transparent;
            color: var(--text);
            font-weight: 500;
            font-size: 1rem;
            border: 1px solid var(--border);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-section .cta-box .btn-secondary:hover {
            border-color: var(--primary);
            color: #fff;
            background: rgba(99, 102, 241, 0.08);
        }
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .footer-brand .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--primary-light);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
            transform: translateX(4px);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0 32px;
            gap: 12px 20px;
            font-size: 0.82rem;
            color: var(--text-dim);
        }
        .footer-bottom a {
            color: var(--text-dim);
            transition: var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
        }
        .footer-bottom span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        @media (max-width: 520px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
            z-index: 999;
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            transition: var(--transition);
        }
        .scroll-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: all;
        }
        .scroll-top:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
        }
        @media (max-width: 520px) {
            .scroll-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }
        ::selection {
            background: rgba(99, 102, 241, 0.3);
            color: #fff;
        }
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(99, 102, 241, 0.3);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f7eff;
            --primary-dark: #004bb5;
            --primary-light: #baddff;
            --accent: #f97316;
            --accent-dark: #c2410c;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

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

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

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

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

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

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        /* ===== Header / 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }

        .site-logo i {
            font-size: 28px;
            color: var(--primary);
        }

        .site-logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
            white-space: nowrap;
        }

        .nav-list a:hover {
            color: var(--primary);
            background: var(--brand-50);
        }

        .nav-list a.active {
            color: var(--primary);
            background: rgba(15, 126, 255, 0.08);
            font-weight: 600;
        }

        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px 3px 0 0;
        }

        .nav-list a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff !important;
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(15, 126, 255, 0.35);
            transition: all var(--transition);
        }

        .nav-list a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(15, 126, 255, 0.45);
        }

        .nav-list a.nav-cta i {
            margin-right: 6px;
        }

        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--text-primary);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .nav-toggle:hover {
            background: var(--brand-50);
        }

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

            .nav-list {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
                transform: translateY(-110%);
                opacity: 0;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
                z-index: 999;
            }

            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-list a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
                font-size: 16px;
            }

            .nav-list a.active::after {
                display: none;
            }

            .nav-list a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
        }

        /* ===== Hero ===== */
        .category-hero {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(15, 126, 255, 0.15) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 50%, rgba(249, 115, 22, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .category-hero h1 {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .category-hero h1 i {
            color: var(--accent);
            margin-right: 12px;
        }

        .category-hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 640px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        .category-hero .hero-search {
            display: flex;
            max-width: 520px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border-radius: 50px;
            padding: 4px;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .category-hero .hero-search input {
            flex: 1;
            padding: 14px 22px;
            background: transparent;
            color: #fff;
            font-size: 15px;
            border-radius: 50px 0 0 50px;
        }

        .category-hero .hero-search input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }

        .category-hero .hero-search button {
            padding: 14px 28px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .category-hero .hero-search button:hover {
            transform: scale(1.03);
            box-shadow: 0 4px 20px rgba(15, 126, 255, 0.4);
        }

        @media (max-width: 768px) {
            .category-hero {
                padding: 56px 0 48px;
                min-height: 280px;
            }
            .category-hero h1 {
                font-size: 30px;
            }
            .category-hero p {
                font-size: 15px;
            }
            .category-hero .hero-search {
                flex-direction: column;
                background: transparent;
                border: none;
                gap: 12px;
            }
            .category-hero .hero-search input {
                background: rgba(255, 255, 255, 0.12);
                border-radius: 50px;
                padding: 12px 18px;
                border: 1px solid rgba(255, 255, 255, 0.15);
            }
            .category-hero .hero-search button {
                border-radius: 50px;
                padding: 12px 24px;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 24px;
            }
        }

        /* ===== 通用区块 ===== */
        .section {
            padding: 72px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            line-height: 1.25;
        }

        .section-header h2 i {
            color: var(--primary);
            margin-right: 10px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 12px auto 0;
        }

        .section-header .tagline {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(15, 126, 255, 0.08);
            color: var(--primary);
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 24px;
            }
        }

        /* ===== 分类标签 ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 24px;
        }

        .tag-list .tag {
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            background: var(--bg-card);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            transition: all var(--transition);
            cursor: pointer;
        }

        .tag-list .tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(15, 126, 255, 0.04);
            transform: translateY(-1px);
        }

        .tag-list .tag.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 14px rgba(15, 126, 255, 0.3);
        }

        .tag-list .tag i {
            margin-right: 6px;
            font-size: 13px;
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .card-grid-2 {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .card-grid-4 {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ===== 攻略卡片 ===== */
        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(15, 126, 255, 0.15);
        }

        .guide-card .card-img {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #eef2f6;
        }

        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

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

        .guide-card .card-img .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(0, 0, 0, 0.65);
            backdrop-filter: blur(4px);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .guide-card .card-img .card-badge.hot {
            background: linear-gradient(135deg, #ef4444, #dc2626);
            border: none;
        }

        .guide-card .card-img .card-badge.new {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border: none;
        }

        .guide-card .card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .guide-card .card-body .card-cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }

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

        .guide-card:hover .card-body h3 {
            color: var(--primary);
        }

        .guide-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .guide-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border);
            font-size: 13px;
            color: var(--text-light);
        }

        .guide-card .card-body .card-meta span i {
            margin-right: 4px;
        }

        .guide-card .card-body .card-meta .read-more {
            color: var(--primary);
            font-weight: 600;
            font-size: 13px;
            transition: all var(--transition);
        }

        .guide-card .card-body .card-meta .read-more:hover {
            color: var(--primary-dark);
            gap: 4px;
        }

        @media (max-width: 520px) {
            .guide-card .card-body {
                padding: 16px;
            }
            .guide-card .card-body h3 {
                font-size: 16px;
            }
        }

        /* ===== 图文列表 ===== */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .article-list-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 16px 20px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            cursor: pointer;
        }

        .article-list-item:hover {
            border-color: rgba(15, 126, 255, 0.2);
            box-shadow: var(--shadow);
            transform: translateX(4px);
        }

        .article-list-item .item-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            background: var(--brand-50);
            color: var(--primary);
            flex-shrink: 0;
        }

        .article-list-item .item-num.top {
            background: linear-gradient(135deg, #f97316, #ef4444);
            color: #fff;
        }

        .article-list-item .item-content {
            flex: 1;
            min-width: 0;
        }

        .article-list-item .item-content h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-list-item .item-content p {
            font-size: 13px;
            color: var(--text-secondary);
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-list-item .item-tag {
            font-size: 12px;
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(15, 126, 255, 0.06);
            color: var(--primary);
            font-weight: 500;
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .article-list-item {
                padding: 12px 16px;
                gap: 14px;
                flex-wrap: wrap;
            }
            .article-list-item .item-tag {
                margin-left: auto;
            }
        }

        /* ===== 排行榜 ===== */
        .rank-list {
            counter-reset: rank;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .rank-item {
            counter-increment: rank;
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 14px 20px;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .rank-item:hover {
            border-color: rgba(15, 126, 255, 0.15);
            box-shadow: var(--shadow-sm);
            transform: translateX(4px);
        }

        .rank-item .rank-num {
            width: 32px;
            font-weight: 800;
            font-size: 18px;
            color: var(--text-light);
            text-align: center;
            flex-shrink: 0;
        }

        .rank-item:nth-child(1) .rank-num {
            color: #ef4444;
        }
        .rank-item:nth-child(2) .rank-num {
            color: #f97316;
        }
        .rank-item:nth-child(3) .rank-num {
            color: #eab308;
        }

        .rank-item .rank-info {
            flex: 1;
            min-width: 0;
        }

        .rank-item .rank-info h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .rank-item .rank-info .rank-stats {
            font-size: 13px;
            color: var(--text-light);
        }

        .rank-item .rank-info .rank-stats i {
            margin-right: 4px;
            color: var(--accent);
        }

        .rank-item .rank-score {
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
        }

        /* ===== 专题卡片 ===== */
        .feature-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: all var(--transition);
            min-height: 200px;
            display: flex;
            flex-direction: column;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .feature-card .feature-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            transition: opacity 0.6s ease;
        }

        .feature-card:hover .feature-bg {
            opacity: 0.14;
        }

        .feature-card .feature-body {
            position: relative;
            z-index: 2;
            padding: 28px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .feature-card .feature-body .feature-icon {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .feature-card .feature-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .feature-card .feature-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }

        .feature-card .feature-body .feature-link {
            margin-top: 16px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }

        .feature-card .feature-body .feature-link:hover {
            gap: 12px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(15, 126, 255, 0.15);
        }

        .faq-item .faq-question {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            transition: background var(--transition);
            gap: 12px;
        }

        .faq-item .faq-question:hover {
            background: rgba(15, 126, 255, 0.02);
        }

        .faq-item .faq-question i {
            color: var(--primary);
            font-size: 18px;
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            padding: 0 22px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(15, 126, 255, 0.1) 0%, transparent 70%);
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 500px;
            margin: 0 auto 28px;
        }

        .cta-section .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 36px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border-radius: 50px;
            font-size: 17px;
            font-weight: 700;
            box-shadow: 0 6px 24px rgba(15, 126, 255, 0.4);
            transition: all var(--transition);
        }

        .cta-section .cta-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(15, 126, 255, 0.5);
        }

        .cta-section .cta-btn i {
            font-size: 18px;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section .cta-btn {
                padding: 14px 28px;
                font-size: 15px;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .site-footer .footer-brand .logo {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .site-footer .footer-brand .logo i {
            color: var(--primary);
        }

        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 360px;
        }

        .site-footer .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }

        .site-footer .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
        }

        .site-footer .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .site-footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }

        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
        }

        .site-footer .footer-bottom a:hover {
            color: var(--primary);
        }

        @media (max-width: 1024px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 背景辅助 ===== */
        .bg-soft-brand {
            background: rgba(15, 126, 255, 0.03);
        }
        .bg-soft-accent {
            background: rgba(249, 115, 22, 0.04);
        }

        /* ===== 响应式调整 ===== */
        @media (max-width: 520px) {
            .section-header h2 {
                font-size: 20px;
            }
            .guide-card .card-body h3 {
                font-size: 15px;
            }
            .faq-item .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }
            .faq-item .faq-answer {
                padding: 0 16px 14px;
                font-size: 14px;
            }
            .rank-item {
                padding: 10px 14px;
            }
            .rank-item .rank-info h4 {
                font-size: 13px;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: #f1f5f9;
        }
        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #94a3b8;
        }

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