/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #f0b429;
            --primary-light: #f7d674;
            --primary-dark: #d4951a;
            --secondary: #7c3aed;
            --secondary-light: #a78bfa;
            --accent: #06b6d4;
            --bg-dark: #0b0e17;
            --bg-card: #131926;
            --bg-card-hover: #1a2332;
            --bg-section: #0f1420;
            --bg-section-alt: #0a0d14;
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --border-color: rgba(240, 180, 41, 0.15);
            --border-glow: rgba(240, 180, 41, 0.3);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
            --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 30px rgba(240, 180, 41, 0.08);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        ul, ol {
            list-style: none;
        }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 排版 ===== */
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 640px;
            margin: 0 auto 2.5rem auto;
            text-align: center;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-header .section-title {
            text-align: center;
        }
        .section-header .section-subtitle {
            text-align: center;
        }

        /* ===== Header / 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(11, 14, 23, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-height);
            transition: var(--transition);
        }
        .header.scrolled {
            background: rgba(11, 14, 23, 0.98);
            box-shadow: var(--shadow-md);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            color: var(--text-primary);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            color: var(--text-secondary);
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
            letter-spacing: 0.3px;
        }
        .nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 18px;
            right: 18px;
            height: 2px;
            background: var(--primary);
            transform: scaleX(0);
            transition: transform 0.3s ease;
            box-shadow: 0 0 10px rgba(240, 180, 41, 0.5);
        }
        .nav a:hover {
            color: var(--text-primary);
            background: rgba(240, 180, 41, 0.06);
        }
        .nav a:hover::after {
            transform: scaleX(1);
        }
        .nav a.active {
            color: var(--primary);
            background: rgba(240, 180, 41, 0.08);
        }
        .nav a.active::after {
            transform: scaleX(1);
            box-shadow: 0 0 15px rgba(240, 180, 41, 0.6);
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
            color: #0b0e17 !important;
            font-weight: 700 !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            box-shadow: 0 0 20px rgba(240, 180, 41, 0.15);
            transition: var(--transition) !important;
        }
        .nav-cta::after {
            display: none !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(240, 180, 41, 0.3) !important;
            background: linear-gradient(135deg, var(--primary-light), var(--primary)) !important;
            color: #0b0e17 !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }
        .hamburger span {
            width: 26px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(11, 14, 23, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 24px 20px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid var(--border-color);
                pointer-events: none;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav a::after {
                display: none;
            }
            .nav a.active {
                border-left: 3px solid var(--primary);
                padding-left: 13px;
            }
            .nav-cta {
                margin-top: 8px;
                text-align: center;
            }
            .hamburger {
                display: flex;
            }
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            padding: 120px 0 80px;
            overflow: hidden;
            background: var(--bg-dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
            mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7), transparent 70%);
            -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7), transparent 70%);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(240, 180, 41, 0.06), transparent 60%),
                        radial-gradient(ellipse at 70% 30%, rgba(124, 58, 237, 0.05), transparent 50%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(240, 180, 41, 0.12);
            border: 1px solid rgba(240, 180, 41, 0.2);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--primary-light);
            margin-bottom: 1.5rem;
            letter-spacing: 0.5px;
        }
        .hero-badge i {
            font-size: 0.75rem;
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 1.2rem;
            letter-spacing: -1px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 2rem;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            cursor: pointer;
            letter-spacing: 0.3px;
            border: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            box-shadow: 0 0 25px rgba(240, 180, 41, 0.15);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 40px rgba(240, 180, 41, 0.3);
            color: #0b0e17;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid rgba(240, 180, 41, 0.3);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(240, 180, 41, 0.06);
            transform: translateY(-3px);
            color: var(--primary);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid rgba(240, 180, 41, 0.08);
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .hero-stat .label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 2px;
        }
        @media (max-width: 768px) {
            .hero {
                padding: 100px 0 60px;
                min-height: auto;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .hero-stat .num {
                font-size: 1.5rem;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero-stats {
                gap: 16px;
            }
            .hero-stat {
                flex: 1;
                min-width: 80px;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-alt2 {
            background: var(--bg-section-alt);
        }
        @media (max-width: 768px) {
            .section {
                padding: 50px 0;
            }
        }

        /* ===== 核心说明板块 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--primary), transparent);
            opacity: 0;
            transition: var(--transition);
        }
        .feature-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(240, 180, 41, 0.25);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(240, 180, 41, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 1.2rem;
            transition: var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: rgba(240, 180, 41, 0.18);
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.6rem;
            color: var(--text-primary);
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 分类入口板块 ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            display: flex;
            align-items: center;
            gap: 20px;
            transition: var(--transition);
            cursor: pointer;
        }
        .category-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(240, 180, 41, 0.25);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }
        .category-card .cat-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: rgba(240, 180, 41, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .category-card .cat-info h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--text-primary);
        }
        .category-card .cat-info p {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .category-card .cat-arrow {
            margin-left: auto;
            color: var(--text-muted);
            font-size: 1rem;
            transition: var(--transition);
        }
        .category-card:hover .cat-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }
        @media (max-width: 640px) {
            .categories-grid {
                grid-template-columns: 1fr;
            }
            .category-card {
                padding: 20px 18px;
            }
        }

        /* ===== 内容 / 资讯列表板块 ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .post-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: rgba(240, 180, 41, 0.2);
        }
        .post-card .post-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: #1a2332;
        }
        .post-card .post-body {
            padding: 20px 22px 24px;
        }
        .post-card .post-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 50px;
            background: rgba(240, 180, 41, 0.12);
            color: var(--primary-light);
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }
        .post-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .post-card h3 a {
            color: inherit;
        }
        .post-card h3 a:hover {
            color: var(--primary);
        }
        .post-card .post-excerpt {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .post-card .post-meta .date i {
            margin-right: 4px;
        }
        .post-card .post-meta .read-more {
            color: var(--primary);
            font-weight: 600;
            font-size: 0.85rem;
        }
        .post-card .post-meta .read-more i {
            margin-left: 4px;
            transition: var(--transition);
        }
        .post-card .post-meta .read-more:hover i {
            transform: translateX(3px);
        }
        .empty-posts {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            font-size: 1.05rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }
        .empty-posts i {
            font-size: 2.5rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            display: block;
            opacity: 0.5;
        }
        @media (max-width: 1024px) {
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .post-card .post-img {
                height: 180px;
            }
        }

        /* ===== 数据 / 流程板块 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(240, 180, 41, 0.2);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            box-shadow: 0 0 20px rgba(240, 180, 41, 0.15);
        }
        .step-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ 板块 ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(240, 180, 41, 0.15);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            font-size: 0.9rem;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 22px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ===== CTA 板块 ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(240, 180, 41, 0.06), rgba(124, 58, 237, 0.04));
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .cta-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at center, rgba(240, 180, 41, 0.03), transparent 60%);
            pointer-events: none;
        }
        .cta-box h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 0.8rem;
        }
        .cta-box p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 2rem;
        }
        .cta-box .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .cta-box .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .cta-box .btn-group .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-section-alt);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(240, 180, 41, 0.06);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(240, 180, 41, 0.06);
            border: 1px solid rgba(240, 180, 41, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: rgba(240, 180, 41, 0.15);
            border-color: rgba(240, 180, 41, 0.3);
            color: var(--primary);
            transform: translateY(-2px);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 移动端微调 ===== */
        @media (max-width: 480px) {
            .section-title {
                font-size: 1.5rem;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #f0c040;
            --primary-dark: #d4a830;
            --primary-glow: rgba(240, 192, 64, 0.45);
            --secondary: #ff6a5e;
            --secondary-glow: rgba(255, 106, 94, 0.35);
            --bg-dark: #0d0b15;
            --bg-card: #17131f;
            --bg-card-hover: #1f1a2e;
            --bg-elevated: #221d30;
            --text-main: #f0eef5;
            --text-dim: #a8a2be;
            --text-muted: #6e6788;
            --border-color: #2d2740;
            --border-glow: rgba(240, 192, 64, 0.2);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(240, 192, 64, 0.06);
            --shadow-elevated: 0 12px 48px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(240, 192, 64, 0.1);
            --shadow-glow: 0 0 30px rgba(240, 192, 64, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: #fff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Nav (暗色霓虹) ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(13, 11, 21, 0.88);
            backdrop-filter: blur(20px) saturate(1.4);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
            transition: var(--transition);
        }
        .header.scrolled {
            background: rgba(13, 11, 21, 0.96);
            border-bottom-color: rgba(240, 192, 64, 0.15);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.6rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.02em;
            user-select: none;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 8px var(--primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, #f0c040, #ff8c5a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-dim);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav a i {
            font-size: 0.85rem;
        }
        .nav a:hover {
            color: #fff;
            background: rgba(240, 192, 64, 0.08);
        }
        .nav a.active {
            color: #fff;
            background: rgba(240, 192, 64, 0.12);
            box-shadow: inset 0 0 0 1px rgba(240, 192, 64, 0.2), 0 0 20px rgba(240, 192, 64, 0.08);
        }
        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
            box-shadow: 0 0 12px var(--primary-glow);
        }
        .nav a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0d0b15;
            font-weight: 700;
            padding: 8px 22px;
            box-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
        }
        .nav a.nav-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 0 35px rgba(240, 192, 64, 0.35);
            color: #0d0b15;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            background: none;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-main);
            border-radius: 3px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(13, 11, 21, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 8px;
                border-bottom: 2px solid var(--border-glow);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                justify-content: center;
                padding: 12px 18px;
                font-size: 1.05rem;
            }
            .nav a.active::after {
                bottom: 0;
                width: 40%;
            }
            .nav a.nav-cta {
                margin-top: 6px;
            }
        }
        @media (max-width: 520px) {
            .logo {
                font-size: 1.3rem;
            }
            .logo i {
                font-size: 1.2rem;
            }
            .nav a {
                font-size: 0.95rem;
                padding: 10px 14px;
            }
        }

        /* ===== Hero / Banner (分类页) ===== */
        .category-hero {
            padding: 140px 0 80px;
            position: relative;
            background: linear-gradient(160deg, #0d0b15 0%, #1a1428 40%, #0d0b15 100%);
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center 30%;
            opacity: 0.18;
            filter: blur(2px) saturate(0.8);
            z-index: 0;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(240, 192, 64, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 80%, rgba(255, 106, 94, 0.05) 0%, transparent 60%);
            z-index: 1;
            pointer-events: none;
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(240, 192, 64, 0.12);
            border: 1px solid rgba(240, 192, 64, 0.2);
            padding: 6px 20px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--primary);
            letter-spacing: 0.04em;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .category-hero .hero-badge i {
            font-size: 0.75rem;
        }
        .category-hero h1 {
            font-size: 3.4rem;
            font-weight: 900;
            line-height: 1.15;
            color: #fff;
            text-shadow: 0 4px 40px rgba(0, 0, 0, 0.5);
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }
        .category-hero h1 span {
            background: linear-gradient(135deg, #f0c040, #ff8c5a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .category-hero p {
            font-size: 1.2rem;
            color: var(--text-dim);
            max-width: 700px;
            margin: 0 auto 30px;
            line-height: 1.8;
        }
        .category-hero .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 10px;
        }
        .category-hero .hero-stats .stat {
            text-align: center;
        }
        .category-hero .hero-stats .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            line-height: 1.2;
            text-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
        }
        .category-hero .hero-stats .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }

        @media (max-width: 768px) {
            .category-hero {
                padding: 110px 0 60px;
                min-height: 320px;
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
            .category-hero .hero-stats {
                gap: 24px;
            }
            .category-hero .hero-stats .stat-num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.7rem;
            }
            .category-hero .hero-stats {
                gap: 16px;
            }
            .category-hero .hero-stats .stat-num {
                font-size: 1.3rem;
            }
        }

        /* ===== Section 通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-dark {
            background: rgba(23, 19, 31, 0.5);
        }
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-header h2 i {
            color: var(--primary);
            margin-right: 8px;
        }
        .section-header p {
            color: var(--text-dim);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 3px;
            margin: 14px auto 0;
            box-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .section-header p {
                font-size: 0.95rem;
            }
        }

        /* ===== 内容卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card-item:hover {
            transform: translateY(-6px);
            border-color: rgba(240, 192, 64, 0.2);
            box-shadow: var(--shadow-elevated), 0 0 30px rgba(240, 192, 64, 0.05);
            background: var(--bg-card-hover);
        }
        .card-item .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
            border-bottom: 1px solid var(--border-color);
        }
        .card-item .card-body {
            padding: 22px 24px 26px;
        }
        .card-item .card-tag {
            display: inline-block;
            background: rgba(240, 192, 64, 0.12);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 14px;
            border-radius: 50px;
            letter-spacing: 0.04em;
            margin-bottom: 10px;
            border: 1px solid rgba(240, 192, 64, 0.1);
        }
        .card-item h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-item p {
            color: var(--text-dim);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 14px;
        }
        .card-item .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .card-item .card-meta i {
            margin-right: 4px;
            color: var(--primary);
        }
        .card-item .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
            margin-top: 6px;
            transition: var(--transition);
        }
        .card-item .card-link:hover {
            color: #fff;
            gap: 10px;
        }

        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 22px;
            }
        }
        @media (max-width: 600px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .card-item .card-body {
                padding: 18px 18px 22px;
            }
            .card-item h3 {
                font-size: 1.05rem;
            }
        }

        /* ===== 图文区块 ===== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .feature-block .feature-img {
            border-radius: var(--radius);
            box-shadow: var(--shadow-elevated);
            border: 1px solid var(--border-color);
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
        }
        .feature-block .feature-content h3 {
            font-size: 1.6rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }
        .feature-block .feature-content h3 i {
            color: var(--primary);
            margin-right: 8px;
        }
        .feature-block .feature-content p {
            color: var(--text-dim);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 18px;
        }
        .feature-block .feature-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .feature-block .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--text-dim);
            font-size: 0.95rem;
        }
        .feature-block .feature-list li i {
            color: var(--primary);
            font-size: 0.9rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        @media (max-width: 900px) {
            .feature-block {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .feature-block .feature-content h3 {
                font-size: 1.3rem;
            }
        }

        /* ===== 学习路径 / 流程 ===== */
        .path-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .path-step {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 30px 24px;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
            position: relative;
            box-shadow: var(--shadow-card);
        }
        .path-step:hover {
            transform: translateY(-4px);
            border-color: rgba(240, 192, 64, 0.2);
            box-shadow: var(--shadow-elevated);
        }
        .path-step .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0d0b15;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: 16px;
            box-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
        }
        .path-step h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .path-step p {
            font-size: 0.88rem;
            color: var(--text-dim);
            line-height: 1.6;
        }
        .path-step .step-arrow {
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary);
            font-size: 1.2rem;
            opacity: 0.5;
        }

        @media (max-width: 1024px) {
            .path-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .path-step .step-arrow {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .path-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(240, 192, 64, 0.15);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            color: #fff;
            font-size: 1rem;
            cursor: pointer;
            gap: 12px;
            transition: var(--transition);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-dim);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            margin-bottom: 6px;
        }

        @media (max-width: 600px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.88rem;
            }
            .faq-answer.open {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(145deg, #1a1428, #0d0b15);
            border-radius: var(--radius);
            padding: 60px 50px;
            text-align: center;
            border: 1px solid rgba(240, 192, 64, 0.12);
            box-shadow: var(--shadow-elevated), inset 0 1px 0 rgba(240, 192, 64, 0.05);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(ellipse at 50% 50%, rgba(240, 192, 64, 0.04) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-block h3 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            position: relative;
        }
        .cta-block p {
            font-size: 1.05rem;
            color: var(--text-dim);
            max-width: 600px;
            margin: 0 auto 28px;
            position: relative;
        }
        .cta-block .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            position: relative;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0d0b15;
            box-shadow: 0 0 30px rgba(240, 192, 64, 0.2);
        }
        .btn-primary:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 0 50px rgba(240, 192, 64, 0.35);
            color: #0d0b15;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-3px);
            background: rgba(240, 192, 64, 0.04);
        }

        @media (max-width: 768px) {
            .cta-block {
                padding: 40px 24px;
            }
            .cta-block h3 {
                font-size: 1.4rem;
            }
            .cta-block p {
                font-size: 0.95rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.92rem;
            }
        }

        /* ===== 标签云 ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 10px;
        }
        .tag-cloud a {
            display: inline-block;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-dim);
            transition: var(--transition);
        }
        .tag-cloud a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(240, 192, 64, 0.06);
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(240, 192, 64, 0.08);
        }

        /* ===== Footer (沿用首页) ===== */
        .footer {
            background: #0a0812;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            margin-top: 20px;
        }
        .footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 12px;
        }
        .footer .footer-brand p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.7;
            max-width: 300px;
        }
        .footer .footer-col h5 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.03em;
        }
        .footer .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.88rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer .footer-col a i {
            margin-right: 8px;
            width: 18px;
        }
        .footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            font-size: 0.82rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer .footer-bottom .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer .footer-bottom .footer-social a {
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .footer .footer-bottom .footer-social a:hover {
            color: var(--primary);
            transform: translateY(-2px);
        }

        @media (max-width: 900px) {
            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .footer .footer-brand {
                grid-column: 1 / -1;
            }
            .footer .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            .footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 动画入场 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== 聚焦轮廓 ===== */
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00d4ff;
            --primary-glow: rgba(0, 212, 255, 0.25);
            --primary-dark: #009bb5;
            --secondary: #7c3aed;
            --secondary-glow: rgba(124, 58, 237, 0.2);
            --accent: #f59e0b;
            --bg-deep: #08080f;
            --bg-body: #0c0c18;
            --bg-card: #12121f;
            --bg-card-hover: #1a1a2e;
            --bg-elevated: #181830;
            --text-primary: #e8e8f0;
            --text-secondary: #9494b0;
            --text-muted: #60607a;
            --border-color: #1e1e3a;
            --border-glow: rgba(0, 212, 255, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5), 0 0 40px rgba(0, 212, 255, 0.03);
            --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.08);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1160px;
            --header-h: 70px;
        }

        /* ===== Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: #66e5ff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        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;
            }
        }

        /* ===== 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(8, 8, 15, 0.88);
            backdrop-filter: blur(18px) saturate(1.4);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 40px rgba(0, 0, 0, 0.6);
            height: var(--header-h);
            transition: var(--transition);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--primary);
            font-size: 28px;
            filter: drop-shadow(0 0 12px var(--primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav a i {
            margin-right: 6px;
            font-size: 14px;
        }
        .nav a:hover {
            color: var(--text-primary);
            background: rgba(0, 212, 255, 0.06);
        }
        .nav a.active {
            color: var(--primary);
            background: rgba(0, 212, 255, 0.08);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px var(--primary-glow);
        }
        .nav a.active i {
            color: var(--primary);
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--secondary)) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.15);
            margin-left: 8px;
        }
        .nav-cta:hover {
            transform: translateY(-1px) scale(1.02);
            box-shadow: 0 0 36px rgba(0, 212, 255, 0.3) !important;
            color: #fff !important;
            background: linear-gradient(135deg, #00e0ff, #8b5cf6) !important;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 26px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(8, 8, 15, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 20px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }
            .nav-cta {
                margin-left: 0 !important;
                margin-top: 8px;
                text-align: center;
            }
        }

        /* ===== Hero 文章头图 ===== */
        .article-hero {
            margin-top: var(--header-h);
            position: relative;
            min-height: 360px;
            display: flex;
            align-items: center;
            background: var(--bg-deep);
            overflow: hidden;
        }
        .article-hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.25;
            transform: scale(1.02);
            filter: blur(2px) brightness(0.5);
        }
        .article-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(8, 8, 15, 0.92) 30%, rgba(0, 212, 255, 0.08) 80%, transparent 100%);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            padding-top: 48px;
            padding-bottom: 48px;
            width: 100%;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: var(--text-muted);
        }
        .article-breadcrumb a:hover {
            color: var(--primary);
        }
        .article-breadcrumb span {
            color: var(--text-secondary);
        }
        .article-breadcrumb .sep {
            color: var(--text-muted);
            font-size: 12px;
        }
        .article-hero-cat {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(0, 212, 255, 0.12);
            color: var(--primary);
            border: 1px solid rgba(0, 212, 255, 0.15);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .article-hero h1 {
            font-size: clamp(28px, 4.2vw, 48px);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            max-width: 860px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            letter-spacing: -0.3px;
        }
        .article-hero h1 i {
            color: var(--primary);
            font-size: 0.9em;
            margin-right: 8px;
        }
        .article-hero-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-top: 20px;
            font-size: 14px;
            color: var(--text-secondary);
            flex-wrap: wrap;
        }
        .article-hero-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-hero-meta i {
            color: var(--primary);
            font-size: 15px;
        }
        .article-hero-desc {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 720px;
            margin-top: 16px;
            line-height: 1.7;
            border-left: 3px solid var(--primary);
            padding-left: 20px;
            background: rgba(0, 0, 0, 0.3);
            border-radius: 0 8px 8px 0;
            padding: 12px 20px;
        }
        @media (max-width: 768px) {
            .article-hero {
                min-height: 280px;
            }
            .article-hero .container {
                padding-top: 32px;
                padding-bottom: 32px;
            }
            .article-hero h1 {
                font-size: 24px;
            }
            .article-hero-desc {
                font-size: 15px;
                padding: 10px 16px;
            }
            .article-hero-meta {
                gap: 12px;
                font-size: 13px;
            }
        }

        /* ===== 文章主体 ===== */
        .article-main {
            padding: 48px 0 64px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            align-items: start;
        }
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        /* 正文区 */
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
        }
        .article-body .content {
            font-size: 17px;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-body .content p {
            margin-bottom: 1.4em;
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
        }
        .article-body .content h2 {
            font-size: 26px;
            border-left: 4px solid var(--primary);
            padding-left: 16px;
        }
        .article-body .content h3 {
            font-size: 21px;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.4em;
            padding-left: 24px;
        }
        .article-body .content ul li {
            list-style: disc;
            margin-bottom: 0.4em;
        }
        .article-body .content ol li {
            list-style: decimal;
            margin-bottom: 0.4em;
        }
        .article-body .content a {
            color: var(--primary);
            border-bottom: 1px solid rgba(0, 212, 255, 0.2);
        }
        .article-body .content a:hover {
            color: #66e5ff;
            border-bottom-color: var(--primary);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            padding: 12px 20px;
            margin: 1.4em 0;
            background: rgba(0, 212, 255, 0.04);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content img {
            border-radius: var(--radius-md);
            margin: 1.6em 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
        }
        .article-body .content pre,
        .article-body .content code {
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-sm);
            font-family: 'JetBrains Mono', 'Fira Code', monospace;
        }
        .article-body .content pre {
            padding: 16px 20px;
            overflow-x: auto;
            border: 1px solid var(--border-color);
            margin: 1.4em 0;
        }
        .article-body .content code {
            padding: 2px 8px;
            font-size: 0.9em;
            color: var(--primary);
        }
        .article-body .content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.4em 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
        }
        .article-body .content th,
        .article-body .content td {
            padding: 10px 16px;
            border: 1px solid var(--border-color);
            text-align: left;
        }
        .article-body .content th {
            background: rgba(0, 212, 255, 0.06);
            font-weight: 600;
            color: var(--primary);
        }
        .article-body .content td {
            background: rgba(255, 255, 255, 0.02);
        }
        .article-not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .article-not-found i {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 28px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 17px;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.15);
        }
        .article-not-found .btn-back:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 36px rgba(0, 212, 255, 0.3);
            color: #fff;
        }
        @media (max-width: 768px) {
            .article-body {
                padding: 24px 18px;
            }
            .article-body .content {
                font-size: 15px;
            }
            .article-body .content h2 {
                font-size: 21px;
            }
            .article-body .content h3 {
                font-size: 18px;
            }
        }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 24px 22px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
        }
        .sidebar-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border-color);
        }
        .sidebar-card h4 i {
            color: var(--primary);
            font-size: 18px;
        }
        .sidebar-info-item {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            font-size: 14px;
            color: var(--text-secondary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }
        .sidebar-info-item .label {
            color: var(--text-muted);
        }
        .sidebar-info-item .value {
            color: var(--text-primary);
            font-weight: 500;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 4px;
        }
        .sidebar-tags a {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            background: rgba(0, 212, 255, 0.06);
            color: var(--text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }
        .sidebar-tags a:hover {
            background: rgba(0, 212, 255, 0.12);
            color: var(--primary);
            border-color: rgba(0, 212, 255, 0.2);
        }
        .sidebar-related-item {
            display: flex;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
            align-items: flex-start;
        }
        .sidebar-related-item:last-child {
            border-bottom: none;
        }
        .sidebar-related-item img {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-elevated);
        }
        .sidebar-related-item .info a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-primary);
            display: block;
            line-height: 1.4;
        }
        .sidebar-related-item .info a:hover {
            color: var(--primary);
        }
        .sidebar-related-item .info .date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }
        @media (max-width: 1024px) {
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .article-sidebar {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 48px 0 56px;
            background: var(--bg-deep);
            border-top: 1px solid var(--border-color);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 36px;
        }
        .related-section .section-title h2 {
            font-size: 30px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .related-section .section-title p {
            color: var(--text-secondary);
            margin-top: 8px;
            font-size: 16px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }
        .related-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 212, 255, 0.2);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 212, 255, 0.05);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--bg-elevated);
        }
        .related-card .card-body {
            padding: 18px 20px 20px;
        }
        .related-card .card-body .cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
            display: block;
        }
        .related-card .card-body h3 {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 8px;
        }
        .related-card .card-body h3 a {
            color: var(--text-primary);
        }
        .related-card .card-body h3 a:hover {
            color: var(--primary);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        @media (max-width: 900px) {
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 560px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-card .card-img {
                height: 160px;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 56px 0 48px;
            background: var(--bg-body);
        }
        .faq-section .section-title {
            text-align: center;
            margin-bottom: 36px;
        }
        .faq-section .section-title h2 {
            font-size: 30px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 212, 255, 0.12);
        }
        .faq-question {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: inherit;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 14px;
            transition: var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        @media (max-width: 640px) {
            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 14px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 56px 0 64px;
            background: var(--bg-deep);
            border-top: 1px solid var(--border-color);
            text-align: center;
        }
        .cta-box {
            max-width: 700px;
            margin: 0 auto;
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.04), rgba(124, 58, 237, 0.04));
            border-radius: var(--radius-xl);
            padding: 48px 40px;
            border: 1px solid rgba(0, 212, 255, 0.08);
            box-shadow: var(--shadow-glow);
        }
        .cta-box h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .cta-box p {
            font-size: 17px;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-box .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.2);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .cta-box .btn-cta:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 0 50px rgba(0, 212, 255, 0.35);
            color: #fff;
        }
        @media (max-width: 640px) {
            .cta-box {
                padding: 32px 20px;
            }
            .cta-box h2 {
                font-size: 24px;
            }
            .cta-box p {
                font-size: 15px;
            }
            .cta-box .btn-cta {
                padding: 12px 28px;
                font-size: 15px;
            }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand .logo {
            font-size: 22px;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h5 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-col a i {
            margin-right: 6px;
            width: 18px;
            text-align: center;
            color: var(--text-muted);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-muted);
            font-size: 16px;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .footer-social a:hover {
            background: rgba(0, 212, 255, 0.12);
            color: var(--primary);
            border-color: rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }