/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #3a5bb8;
            --primary-dark: #0f1a42;
            --secondary: #e8a838;
            --secondary-light: #f5c85a;
            --accent: #e85d3a;
            --bg-light: #f8f9fc;
            --bg-white: #ffffff;
            --bg-dark: #0f1a42;
            --bg-card: #ffffff;
            --text-dark: #1a1a2e;
            --text-body: #3d3d5c;
            --text-light: #6b6b8a;
            --text-white: #ffffff;
            --border-light: #e8ecf4;
            --border-card: #edf0f8;
            --shadow-sm: 0 2px 8px rgba(26, 42, 108, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 42, 108, 0.10);
            --shadow-lg: 0 20px 60px rgba(26, 42, 108, 0.12);
            --shadow-glow: 0 0 40px rgba(232, 168, 56, 0.15);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

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

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3 {
            color: var(--text-white);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            font-size: 36px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-header p {
            font-size: 18px;
            color: var(--text-light);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.6;
        }
        .section-header .badge {
            display: inline-block;
            background: rgba(232, 168, 56, 0.12);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 18px;
            border-radius: 30px;
            letter-spacing: 1px;
            margin-bottom: 16px;
            text-transform: uppercase;
        }
        .section-header .divider {
            width: 48px;
            height: 3px;
            background: var(--secondary);
            border-radius: 4px;
            margin: 16px auto 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .section-header p {
                font-size: 16px;
            }
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
            flex-shrink: 0;
        }
        .logo i {
            color: var(--secondary);
            font-size: 26px;
        }
        .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(--primary);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            transition: var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.06);
        }
        .main-nav a.active {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.08);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 3px;
            background: var(--secondary);
            border-radius: 4px;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary);
            color: var(--text-white) !important;
            padding: 10px 22px !important;
            border-radius: 30px !important;
            font-weight: 600 !important;
            font-size: 14px !important;
        }
        .nav-cta:hover {
            background: var(--primary-light) !important;
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }
        .nav-cta i {
            font-size: 14px;
        }
        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--primary);
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        @media (max-width: 900px) {
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 4px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 18px;
                border-radius: 10px;
            }
            .main-nav a.active::after {
                display: none;
            }
            .nav-cta {
                justify-content: center;
                margin-top: 8px;
            }
            .nav-toggle {
                display: block;
            }
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 120px 0 80px;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 66, 0.85) 0%, rgba(26, 42, 108, 0.70) 60%, rgba(15, 26, 66, 0.80) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg-light), transparent);
            z-index: 2;
        }
        .hero .container {
            position: relative;
            z-index: 3;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(232, 168, 56, 0.18);
            border: 1px solid rgba(232, 168, 56, 0.25);
            color: var(--secondary-light);
            font-size: 13px;
            font-weight: 500;
            padding: 6px 18px;
            border-radius: 30px;
            margin-bottom: 24px;
            letter-spacing: 0.5px;
        }
        .hero-badge i {
            font-size: 14px;
        }
        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero h1 .highlight {
            color: var(--secondary-light);
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 19px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 600px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--secondary);
            color: var(--primary-dark) !important;
            font-weight: 700;
            font-size: 16px;
            padding: 14px 34px;
            border-radius: 40px;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(232, 168, 56, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(232, 168, 56, 0.45);
            background: var(--secondary-light);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.10);
            color: var(--text-white) !important;
            font-weight: 600;
            font-size: 16px;
            padding: 14px 30px;
            border-radius: 40px;
            border: 1px solid rgba(255, 255, 255, 0.20);
            backdrop-filter: blur(8px);
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.18);
            border-color: rgba(255, 255, 255, 0.35);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .num {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
        }
        .hero-stat .num small {
            font-size: 18px;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.5);
        }
        .hero-stat .label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 4px;
        }
        @media (max-width: 900px) {
            .hero h1 {
                font-size: 36px;
            }
            .hero p {
                font-size: 17px;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .hero-stat .num {
                font-size: 26px;
            }
        }
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 28px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
        }

        /* ===== 核心说明 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .intro-text h2 {
            font-size: 32px;
            margin-bottom: 20px;
        }
        .intro-text p {
            font-size: 17px;
            color: var(--text-light);
            margin-bottom: 20px;
            line-height: 1.8;
        }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 28px;
        }
        .intro-feature {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            background: var(--bg-light);
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-dark);
        }
        .intro-feature i {
            color: var(--secondary);
            font-size: 18px;
            flex-shrink: 0;
        }
        .intro-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        .intro-image .play-badge {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(0, 0, 0, 0.65);
            backdrop-filter: blur(8px);
            color: var(--text-white);
            padding: 10px 20px;
            border-radius: 40px;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        @media (max-width: 900px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .intro-text h2 {
                font-size: 26px;
            }
            .intro-features {
                grid-template-columns: 1fr;
            }
            .intro-image img {
                height: 280px;
            }
        }

        /* ===== 分类入口 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            border: 1px solid var(--border-card);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }
        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: var(--transition);
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .category-card:hover::before {
            opacity: 1;
        }
        .category-card .icon {
            width: 52px;
            height: 52px;
            background: rgba(26, 42, 108, 0.06);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 18px;
            transition: var(--transition);
        }
        .category-card:hover .icon {
            background: var(--primary);
            color: var(--text-white);
        }
        .category-card h3 {
            font-size: 19px;
            margin-bottom: 8px;
        }
        .category-card p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .category-card .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-light);
            background: rgba(26, 42, 108, 0.06);
            padding: 3px 12px;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }
        .category-card .arrow {
            position: absolute;
            top: 28px;
            right: 28px;
            font-size: 18px;
            color: var(--border-light);
            transition: var(--transition);
        }
        .category-card:hover .arrow {
            color: var(--secondary);
            transform: translateX(4px);
        }

        /* ===== 内容/资讯列表 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 28px;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-card);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .news-card .thumb {
            width: 100%;
            height: 200px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .news-card .body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 10px;
        }
        .news-card .meta .cat {
            background: rgba(26, 42, 108, 0.06);
            color: var(--primary-light);
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 12px;
        }
        .news-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
            line-height: 1.4;
            flex: 1;
        }
        .news-card h3 a {
            color: var(--text-dark);
        }
        .news-card h3 a:hover {
            color: var(--primary-light);
        }
        .news-card .excerpt {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card .read-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 6px;
            margin-top: auto;
        }
        .news-card .read-more i {
            font-size: 12px;
            transition: var(--transition);
        }
        .news-card .read-more:hover i {
            transform: translateX(4px);
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            color: var(--text-light);
            font-size: 16px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-light);
        }
        @media (max-width: 520px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 数据/流程 ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
            text-align: center;
        }
        .stat-item {
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            padding: 36px 20px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.10);
            transform: translateY(-2px);
        }
        .stat-item .num {
            font-size: 40px;
            font-weight: 800;
            color: var(--secondary-light);
            line-height: 1.2;
        }
        .stat-item .num small {
            font-size: 20px;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.4);
        }
        .stat-item .label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 8px;
        }
        .stat-item .icon {
            font-size: 28px;
            color: rgba(232, 168, 56, 0.4);
            margin-bottom: 12px;
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            margin-top: 20px;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border-card);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-num {
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .step-card h3 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }
        .step-card .connector {
            display: none;
        }
        @media (min-width: 900px) {
            .steps-grid {
                position: relative;
            }
            .step-card {
                position: relative;
            }
            .step-card:not(:last-child)::after {
                content: '→';
                position: absolute;
                right: -18px;
                top: 50%;
                transform: translateY(-50%);
                font-size: 24px;
                color: var(--secondary);
                opacity: 0.5;
                font-weight: 300;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            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-card);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            background: none;
            text-align: left;
            gap: 16px;
            transition: var(--transition);
        }
        .faq-question i {
            font-size: 16px;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 66, 0.88), rgba(26, 42, 108, 0.78));
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 34px;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .cta-actions .btn-primary {
            background: var(--secondary);
            color: var(--primary-dark) !important;
            box-shadow: 0 4px 24px rgba(232, 168, 56, 0.4);
        }
        .cta-actions .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-white) !important;
            font-weight: 600;
            font-size: 16px;
            padding: 14px 30px;
            border-radius: 40px;
            border: 1px solid rgba(255, 255, 255, 0.30);
            transition: var(--transition);
        }
        .cta-actions .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(255, 255, 255, 0.50);
        }
        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-actions .btn-primary,
            .cta-actions .btn-outline-light {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.65);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .footer-brand .logo span {
            background: linear-gradient(135deg, #fff, #c8d0e8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 16px;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary-light);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--secondary-light);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 16px;
            transition: var(--transition);
        }
        .footer-social a:hover {
            border-color: var(--secondary);
            color: var(--secondary);
            background: rgba(232, 168, 56, 0.10);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 回到顶部 ===== */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            z-index: 99;
            opacity: 0;
            transform: translateY(20px);
            transition: var(--transition);
            pointer-events: none;
        }
        .back-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }
        .back-top:hover {
            background: var(--primary-light);
            transform: translateY(-3px);
        }

        /* ===== 标签 ===== */
        .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 14px;
            border-radius: 20px;
            background: rgba(26, 42, 108, 0.06);
            color: var(--primary-light);
            letter-spacing: 0.3px;
        }
        .tag-gold {
            background: rgba(232, 168, 56, 0.12);
            color: var(--secondary);
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 768px) {
            .hero {
                min-height: 80vh;
                padding: 100px 0 60px;
            }
            .section-header .badge {
                font-size: 12px;
            }
        }
        @media (max-width: 520px) {
            .hero {
                min-height: 70vh;
                padding: 90px 0 40px;
            }
            .hero h1 {
                font-size: 26px;
            }
            .intro-feature {
                font-size: 14px;
            }
            .category-card {
                padding: 24px 20px;
            }
        }

/* roulang page: category1 */
/* ===== CSS Variables / Design System ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-soft: #f1f5f9;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.05);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.06);
            --shadow-btn: 0 2px 8px rgba(37,99,235,0.30);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-full: 9999px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-w: 1200px;
            --header-h: 72px;
            --section-space: 80px;
            --grid-gap: 28px;
        }

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

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255,255,255,0.98);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo i {
            font-size: 28px;
            color: var(--primary);
            background: var(--primary-light);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: transform var(--transition);
        }
        .logo:hover i {
            transform: scale(1.08) rotate(-4deg);
        }
        .logo span {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-toggle {
            display: none;
            font-size: 26px;
            color: var(--text-primary);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            background: var(--bg-soft);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--border-color);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .main-nav a:hover {
            background: var(--bg-soft);
            color: var(--primary);
        }
        .main-nav a.active {
            background: var(--primary-light);
            color: var(--primary-dark);
            font-weight: 600;
        }
        .main-nav a.nav-cta {
            background: var(--primary-gradient);
            color: var(--text-white);
            padding: 8px 22px;
            font-weight: 600;
            box-shadow: var(--shadow-btn);
            margin-left: 8px;
        }
        .main-nav a.nav-cta:hover {
            box-shadow: 0 4px 16px rgba(37,99,235,0.40);
            transform: translateY(-1px);
        }
        .main-nav a.nav-cta i {
            margin-right: 6px;
            font-size: 13px;
        }

        /* ===== Page Banner (Hero inner) ===== */
        .page-banner {
            margin-top: var(--header-h);
            padding: 80px 0 70px;
            background: var(--primary-gradient);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: "";
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 60px;
            background: var(--bg-body);
            border-radius: 0 0 50% 50% / 0 0 100% 100%;
            transform: scaleY(0.5);
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 1px;
            margin-bottom: 14px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .page-banner p {
            font-size: 18px;
            color: rgba(255,255,255,0.90);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255,255,255,0.75);
            margin-bottom: 18px;
        }
        .page-banner .breadcrumb a {
            color: rgba(255,255,255,0.85);
        }
        .page-banner .breadcrumb a:hover {
            color: #fff;
        }
        .page-banner .breadcrumb span {
            color: rgba(255,255,255,0.55);
        }

        /* ===== Sections ===== */
        .section {
            padding: var(--section-space) 0;
        }
        .section-alt {
            background: var(--bg-soft);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            text-align: center;
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }
        .section-title-left {
            text-align: left;
        }
        .section-subtitle-left {
            text-align: left;
            margin-left: 0;
        }

        /* ===== Guide Intro ===== */
        .guide-intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .guide-intro-text h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 18px;
            color: var(--text-primary);
        }
        .guide-intro-text p {
            color: var(--text-secondary);
            margin-bottom: 16px;
            font-size: 16px;
            line-height: 1.8;
        }
        .guide-intro-text .highlight-list {
            margin-top: 20px;
        }
        .guide-intro-text .highlight-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        .guide-intro-text .highlight-list li i {
            color: var(--primary);
            font-size: 18px;
            margin-top: 3px;
            flex-shrink: 0;
        }
        .guide-intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .guide-intro-image img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .guide-intro-image:hover img {
            transform: scale(1.03);
        }

        /* ===== Steps / Flow ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--grid-gap);
            counter-reset: step-counter;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            box-shadow: 0 4px 12px rgba(37,99,235,0.25);
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Guide Cards (分类内容) ===== */
        .guide-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--grid-gap);
        }
        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .guide-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }
        .guide-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .guide-card .card-body {
            padding: 22px 22px 26px;
        }
        .guide-card .card-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 12px;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary-dark);
            margin-bottom: 10px;
        }
        .guide-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .guide-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
        }
        .guide-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .guide-card .card-link:hover {
            color: var(--primary-dark);
        }
        .guide-card .card-link i {
            font-size: 12px;
            transition: transform var(--transition);
        }
        .guide-card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-soft);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 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: var(--primary-gradient);
            padding: 70px 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 center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 14px;
            text-shadow: 0 2px 10px rgba(0,0,0,0.10);
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255,255,255,0.88);
            max-width: 580px;
            margin: 0 auto 30px;
        }
        .cta-btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary,
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: var(--radius-full);
            font-size: 16px;
            font-weight: 600;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--text-primary);
            box-shadow: 0 4px 16px rgba(245,158,11,0.35);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.40);
            color: var(--text-primary);
        }
        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255,255,255,0.55);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.12);
            border-color: rgba(255,255,255,0.85);
            color: var(--text-white);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.80);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            background: rgba(255,255,255,0.12);
            color: var(--primary-light);
        }
        .footer-brand .logo span {
            -webkit-text-fill-color: #fff;
            background: none;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.60);
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255,255,255,0.60);
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-social {
            display: flex;
            gap: 14px;
            margin-top: 16px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            color: rgba(255,255,255,0.70);
            font-size: 18px;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
            padding-left: 0;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 22px 0;
            font-size: 13px;
            color: rgba(255,255,255,0.45);
            flex-wrap: wrap;
            gap: 10px;
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.55);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .guide-card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-space: 56px;
                --header-h: 64px;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                display: none;
                gap: 8px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                text-align: center;
                padding: 12px 16px;
            }
            .main-nav a.nav-cta {
                margin-left: 0;
                margin-top: 6px;
            }
            .page-banner {
                padding: 60px 0 50px;
                min-height: 240px;
            }
            .page-banner h1 {
                font-size: 28px;
            }
            .page-banner p {
                font-size: 15px;
            }
            .guide-intro-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .guide-intro-image img {
                height: 240px;
            }
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 32px;
            }
            .guide-card-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-card {
                padding: 24px 18px;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-btn-group {
                flex-direction: column;
                align-items: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 24px;
            }
            .guide-intro-text h2 {
                font-size: 22px;
            }
            .section-title {
                font-size: 22px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 14px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .gap-8 {
            gap: 8px;
        }

/* roulang page: article */
/* ========== :root 设计变量 ========== */
        :root {
            --primary: #6c5ce7;
            --primary-dark: #5a4bd1;
            --primary-light: #a29bfe;
            --secondary: #fd79a8;
            --accent: #fdcb6e;
            --bg-body: #f8f9fd;
            --bg-white: #ffffff;
            --bg-soft: #f0f0ff;
            --bg-dark: #2d2b55;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8888aa;
            --text-white: #f0f0ff;
            --border-color: #e8e8f0;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 12px rgba(108, 92, 231, 0.06);
            --shadow-md: 0 8px 32px rgba(108, 92, 231, 0.10);
            --shadow-lg: 0 16px 48px rgba(108, 92, 231, 0.14);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --container-w: 1200px;
            --header-h: 72px;
        }

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

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

        /* ========== 站点头部 ========== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(108, 92, 231, 0.08);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 24px rgba(108, 92, 231, 0.08);
        }
        .header-inner {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
        }
        .logo i {
            font-size: 28px;
            color: var(--primary);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .logo:hover {
            color: var(--primary);
        }

        /* ========== 导航 ========== */
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 15px;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: rgba(108, 92, 231, 0.06);
        }
        .main-nav a.active {
            color: var(--primary);
            background: rgba(108, 92, 231, 0.10);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .main-nav .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff !important;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: 10px;
        }
        .main-nav .nav-cta i {
            font-size: 14px;
        }
        .main-nav .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(108, 92, 231, 0.30);
        }
        .nav-toggle {
            display: none;
            background: none;
            font-size: 26px;
            color: var(--text-primary);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(108, 92, 231, 0.06);
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                opacity: 0;
                visibility: hidden;
                transform: translateY(-12px);
                transition: all var(--transition);
            }
            .main-nav.open {
                opacity: 1;
                visibility: visible;
                transform: translateY(0);
            }
            .main-nav a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav a.active {
                background: rgba(108, 92, 231, 0.10);
            }
            .main-nav .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                justify-content: center;
            }
        }

        /* ========== 文章页头部横幅 ========== */
        .article-banner {
            margin-top: var(--header-h);
            padding: 60px 0 40px;
            background: linear-gradient(135deg, var(--bg-soft) 0%, #e8e5ff 100%);
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(108, 92, 231, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 1;
        }
        .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 .sep {
            color: var(--border-color);
            font-size: 12px;
        }
        .article-category-badge {
            display: inline-block;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            font-size: 32px;
            font-weight: 800;
            max-width: 860px;
            line-height: 1.3;
            margin-bottom: 16px;
            background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-dark) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .article-meta i {
            margin-right: 6px;
            color: var(--primary-light);
        }
        .article-meta span {
            display: flex;
            align-items: center;
        }

        @media (max-width: 768px) {
            .article-banner {
                padding: 40px 0 30px;
            }
            .article-banner h1 {
                font-size: 24px;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
        }

        /* ========== 文章主体 ========== */
        .article-main {
            padding: 48px 0 64px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-content {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            min-height: 360px;
        }
        .article-content p {
            margin-bottom: 20px;
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-content h2 {
            font-size: 24px;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .article-content h3 {
            font-size: 20px;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-content ul li {
            list-style: disc;
            margin-bottom: 8px;
            color: var(--text-secondary);
        }
        .article-content ol li {
            list-style: decimal;
            margin-bottom: 8px;
            color: var(--text-secondary);
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--bg-soft);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
        }
        .article-content .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-content .article-not-found i {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .article-content .article-not-found h2 {
            margin-top: 0;
            font-size: 28px;
        }
        .article-content .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .article-content .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            text-decoration: none;
        }
        .article-content .article-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ========== 侧边栏 ========== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card h3 i {
            color: var(--primary);
            font-size: 20px;
        }
        .sidebar-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .sidebar-list a:last-child {
            border-bottom: none;
        }
        .sidebar-list a:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .sidebar-list a .num {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
        }
        .sidebar-list a .text {
            flex: 1;
        }
        .sidebar-list a .text .title {
            font-weight: 600;
            color: var(--text-primary);
            display: block;
            margin-bottom: 2px;
        }
        .sidebar-list a .text .desc {
            font-size: 13px;
            color: var(--text-muted);
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: var(--radius-md);
            padding: 28px 24px;
            text-align: center;
            color: #fff;
        }
        .sidebar-cta h3 {
            color: #fff;
            font-size: 18px;
            margin-bottom: 8px;
        }
        .sidebar-cta p {
            font-size: 14px;
            opacity: 0.85;
            margin-bottom: 18px;
        }
        .sidebar-cta .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--primary);
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }
        .sidebar-cta .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.20);
        }

        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 600px) {
            .article-content {
                padding: 24px 18px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
        }

        /* ========== 文章底部导航 ========== */
        .article-nav {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-nav a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .article-nav a:hover {
            color: var(--primary);
            background: var(--bg-soft);
        }
        .article-nav .nav-prev i {
            margin-right: 4px;
        }
        .article-nav .nav-next i {
            margin-left: 4px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 24px;
        }
        .article-tags .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--bg-soft);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--primary);
            color: #fff;
        }

        @media (max-width: 600px) {
            .article-nav {
                flex-direction: column;
                align-items: stretch;
            }
            .article-nav a {
                justify-content: center;
            }
        }

        /* ========== 相关文章 ========== */
        .related-section {
            padding: 48px 0 64px;
            background: var(--bg-body);
        }
        .related-section .section-title {
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 32px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card .card-img {
            height: 180px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .related-card .card-img .cat-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(108, 92, 231, 0.90);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
        }
        .related-card .card-body h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .related-card .card-body .meta {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .related-card .card-body .meta i {
            margin-right: 4px;
            font-size: 12px;
        }

        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 600px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 60px 0 30px;
            border-top: 4px solid var(--primary);
        }
        .site-footer .container {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--text-white);
        }
        .footer-brand .logo i {
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .footer-brand .logo span {
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.60);
            max-width: 380px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-white);
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 32px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .footer-col a {
            display: block;
            padding: 5px 0;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: rgba(255, 255, 255, 0.60);
            padding: 0;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
            padding-left: 0;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.40);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.50);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 600px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ========== 工具类 ========== */
        .text-center {
            text-align: center;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }

        /* ========== 按钮通用 ========== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(108, 92, 231, 0.30);
            color: #fff;
        }

        /* ========== 回到顶部 ========== */
        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: all var(--transition);
            z-index: 999;
            border: none;
            cursor: pointer;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }