/* roulang page: index */
/* ========== 设计变量 ========== */
        :root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-light: #EFF6FF;
            --bg: #F8FAFC;
            --card-bg: #FFFFFF;
            --text-main: #0F172A;
            --text-secondary: #475569;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --success: #10B981;
            --danger: #F87171;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 4px 10px rgba(15, 23, 42, 0.07);
            --shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.08);
            --shadow-brand: 0 8px 30px rgba(37, 99, 235, 0.12);
            --transition: 200ms ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text-main);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            outline: none;
        }

        :focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ========== 容器 ========== */
        .container-custom {
            max-width: 80rem;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 640px) {
            .container-custom {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        @media (min-width: 1024px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }

        .site-header.scrolled {
            box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-main);
            transition: background var(--transition);
        }

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

        .nav-toggle svg {
            width: 22px;
            height: 22px;
        }

        .nav-link {
            position: relative;
            padding: 0.5rem 1rem;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 10px;
            transition: all var(--transition);
            display: inline-block;
        }

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

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

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }

        .mobile-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
            padding: 1rem 1.5rem 1.5rem;
            flex-direction: column;
            gap: 0.25rem;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            display: block;
            padding: 0.875rem 1rem;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-main);
            border-radius: 12px;
            min-height: 48px;
            line-height: 1.4;
            transition: all var(--transition);
        }

        .mobile-menu a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        .mobile-menu a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }

        @media (max-width: 767px) {
            .nav-links {
                display: none !important;
            }
            .nav-toggle {
                display: inline-flex;
            }
        }

        /* ========== 区块通用 ========== */
        .section-padding {
            padding: 4rem 0;
        }

        @media (min-width: 768px) {
            .section-padding {
                padding: 6rem 0;
            }
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.25rem 0.875rem;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 999px;
            font-size: 0.8125rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 1rem;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            letter-spacing: -0.01em;
            margin-bottom: 0.75rem;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.25rem;
            }
        }

        .section-subtitle {
            font-size: 1.0625rem;
            color: var(--text-secondary);
            max-width: 42rem;
            margin-bottom: 2.5rem;
            line-height: 1.7;
        }

        /* ========== Hero ========== */
        .hero-section {
            position: relative;
            padding: 5rem 0 6rem;
            background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 45%, #F8FAFC 100%);
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.75) 100%);
            pointer-events: none;
            z-index: 0;
        }

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

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.375rem 1rem;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--border);
            border-radius: 999px;
            font-size: 0.8125rem;
            font-weight: 500;
            color: var(--text-secondary);
            box-shadow: var(--shadow-sm);
            margin-bottom: 1.25rem;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--success);
            display: inline-block;
        }

        .hero-title {
            font-size: 2.25rem;
            line-height: 1.18;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.02em;
            margin-bottom: 1.25rem;
        }

        @media (min-width: 768px) {
            .hero-title {
                font-size: 3rem;
            }
        }

        .hero-title span {
            color: var(--primary);
        }

        .hero-desc {
            font-size: 1.125rem;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 34rem;
            margin-bottom: 2rem;
        }

        .hero-cta {
            display: flex;
            flex-wrap: wrap;
            gap: 0.875rem;
            margin-bottom: 2.5rem;
        }

        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.875rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .trust-item .icon {
            width: 20px;
            height: 20px;
            color: var(--success);
            flex-shrink: 0;
        }

        .hero-image-wrap {
            position: relative;
            z-index: 1;
        }

        .hero-image-main {
            border-radius: 1.5rem;
            box-shadow: var(--shadow-lg);
            transform: rotate(1.5deg) translateY(-12px);
            border: 4px solid #fff;
            width: 100%;
            height: auto;
            transition: transform var(--transition);
        }

        .hero-image-main:hover {
            transform: rotate(0deg) translateY(-6px);
        }

        .hero-image-float {
            position: absolute;
            bottom: -1rem;
            left: -1.25rem;
            background: #fff;
            border-radius: 1rem;
            padding: 0.75rem 1.25rem;
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            gap: 0.625rem;
            font-size: 0.8125rem;
            font-weight: 600;
            color: var(--text-main);
        }

        .hero-image-float .icon {
            width: 32px;
            height: 32px;
            background: var(--primary-light);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1rem;
        }

        @media (max-width: 767px) {
            .hero-section {
                padding: 3rem 0 4rem;
            }
            .hero-image-wrap {
                margin-top: 2.5rem;
            }
        }

        /* ========== 指标卡 ========== */
        .metric-card {
            background: var(--card-bg);
            border-radius: var(--radius-xl);
            padding: 1.75rem 1.25rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(226, 232, 240, 0.6);
            text-align: center;
            transition: all var(--transition);
            height: 100%;
        }

        .metric-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }

        .metric-icon {
            width: 3rem;
            height: 3rem;
            border-radius: 0.875rem;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
        }

        .metric-icon svg {
            width: 1.5rem;
            height: 1.5rem;
        }

        .metric-value {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.2;
        }

        @media (min-width: 768px) {
            .metric-value {
                font-size: 2.5rem;
            }
        }

        .metric-label {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-top: 0.5rem;
        }

        /* ========== 服务卡 ========== */
        .service-card {
            background: var(--card-bg);
            border-radius: var(--radius-xl);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: all var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .service-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--primary-200, #BFDBFE);
        }

        .service-badge {
            position: absolute;
            top: 1rem;
            right: 1rem;
        }

        .service-icon {
            width: 3rem;
            height: 3rem;
            border-radius: 0.875rem;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.25rem;
        }

        .service-icon svg {
            width: 1.5rem;
            height: 1.5rem;
        }

        .service-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 0.5rem;
        }

        .service-desc {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            line-height: 1.65;
            flex-grow: 1;
            margin-bottom: 1rem;
        }

        .service-link {
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            transition: gap var(--transition);
        }

        .service-link:hover {
            gap: 0.5rem;
        }

        /* ========== 标签 ========== */
        .tag {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
            transition: all var(--transition);
        }

        .tag:hover {
            background: var(--primary-100, #DBEAFE);
        }

        .tag-hot {
            background: #FEF3C7;
            color: #B45309;
        }

        .tag-hot:hover {
            background: #FDE68A;
        }

        /* ========== 热榜 ========== */
        .hot-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 0;
            border-bottom: 1px solid var(--border);
            transition: all var(--transition);
        }

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

        .hot-item .rank {
            width: 2rem;
            height: 2rem;
            border-radius: 0.625rem;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 700;
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .hot-item .rank.top {
            background: var(--primary);
            color: #fff;
        }

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

        .hot-item .title {
            font-size: 0.9375rem;
            font-weight: 600;
            color: var(--text-main);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            transition: color var(--transition);
        }

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

        .hot-item .meta {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-top: 0.125rem;
        }

        .hot-item .downloads {
            font-size: 0.8125rem;
            font-weight: 600;
            color: var(--text-secondary);
            flex-shrink: 0;
            text-align: right;
        }

        /* ========== 对比卡 ========== */
        .compare-card {
            border-radius: var(--radius-xl);
            padding: 2rem;
            height: 100%;
        }

        .compare-card.pain {
            background: #F1F5F9;
            border: 1px solid var(--border);
        }

        .compare-card.solution {
            background: var(--primary-light);
            border: 2px solid var(--primary-200, #BFDBFE);
            box-shadow: var(--shadow-brand);
        }

        .compare-card .compare-title {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 1.25rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .compare-card .compare-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.875rem;
        }

        .compare-card .compare-list li {
            display: flex;
            align-items: flex-start;
            gap: 0.625rem;
            font-size: 0.9375rem;
            color: var(--text-secondary);
            line-height: 1.55;
        }

        .compare-card .compare-list li .icon {
            flex-shrink: 0;
            width: 1.25rem;
            height: 1.25rem;
            margin-top: 0.15rem;
        }

        .compare-card.pain .compare-list li .icon {
            color: var(--danger);
        }

        .compare-card.solution .compare-list li {
            color: var(--text-main);
            font-weight: 500;
        }

        .compare-card.solution .compare-list li .icon {
            color: var(--success);
        }

        /* ========== 资讯列表 ========== */
        .news-list .news-item {
            display: flex;
            align-items: flex-start;
            gap: 0.75rem;
            padding: 0.875rem 0;
            border-bottom: 1px solid var(--border);
            transition: padding-left var(--transition);
        }

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

        .news-list .news-item:hover {
            padding-left: 0.5rem;
        }

        .news-list .news-item .news-marker {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
            margin-top: 0.625rem;
            flex-shrink: 0;
        }

        .news-list .news-item .news-title {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-main);
            transition: color var(--transition);
            line-height: 1.5;
        }

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

        .news-list .news-item .news-meta {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-top: 0.125rem;
        }

        .news-side-card {
            display: flex;
            gap: 0.875rem;
            background: var(--card-bg);
            border-radius: 1rem;
            padding: 0.875rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: all var(--transition);
        }

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

        .news-side-card .thumb {
            width: 5rem;
            height: 3.75rem;
            border-radius: 0.625rem;
            object-fit: cover;
            flex-shrink: 0;
        }

        .news-side-card .info .title {
            font-size: 0.8125rem;
            font-weight: 600;
            color: var(--text-main);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-side-card .info .date {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 0.25rem;
        }

        /* ========== FAQ 手风琴 ========== */
        .faq-wrap {
            max-width: 48rem;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border-radius: 1rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(226, 232, 240, 0.6);
            margin-bottom: 0.75rem;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }

        .faq-item.active {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-200, #BFDBFE);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.25rem 1.5rem;
            background: transparent;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            line-height: 1.5;
            min-height: 56px;
        }

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

        .faq-icon {
            width: 1.75rem;
            height: 1.75rem;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.125rem;
            flex-shrink: 0;
            transition: transform 0.3s ease, background 0.3s ease;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer-inner {
            padding: 0 1.5rem 1.375rem;
            font-size: 0.9375rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 表单 ========== */
        .form-card {
            background: #fff;
            border-radius: 1.5rem;
            box-shadow: var(--shadow-brand);
            padding: 2rem;
            max-width: 36rem;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .form-card .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 0.375rem;
        }

        .form-card .form-input,
        .form-card .form-select,
        .form-card .form-textarea {
            width: 100%;
            border: 1px solid var(--border);
            border-radius: 0.75rem;
            padding: 0.75rem 1rem;
            font-size: 0.9375rem;
            color: var(--text-main);
            background: #F8FAFC;
            transition: all var(--transition);
            line-height: 1.5;
        }

        .form-card .form-input:focus,
        .form-card .form-select:focus,
        .form-card .form-textarea:focus {
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }

        .form-card .form-textarea {
            resize: vertical;
            min-height: 4.5rem;
        }

        .form-card .form-submit {
            width: 100%;
            padding: 0.875rem 1.5rem;
            background: var(--primary);
            color: #fff;
            border-radius: 0.75rem;
            font-size: 1rem;
            font-weight: 600;
            transition: all var(--transition);
            min-height: 48px;
        }

        .form-card .form-submit:hover {
            background: var(--primary-dark);
        }

        .form-card .form-submit:active {
            transform: translateY(1px);
        }

        .form-privacy {
            font-size: 0.8125rem;
            color: var(--text-muted);
            text-align: center;
            margin-top: 1rem;
            line-height: 1.5;
        }

        .cta-section {
            position: relative;
            background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
            padding: 4rem 0 5rem;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
        }

        .cta-section .section-title {
            color: #fff;
        }

        .cta-section .section-subtitle {
            color: rgba(255, 255, 255, 0.85);
        }

        /* ========== 按钮 ========== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 0.75rem 1.75rem;
            border-radius: 0.75rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
            transition: all var(--transition);
            min-height: 48px;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            font-size: 1rem;
            padding: 0.75rem 1.75rem;
            border-radius: 0.75rem;
            border: 1.5px solid var(--primary);
            transition: all var(--transition);
            min-height: 48px;
        }

        .btn-secondary:hover {
            background: var(--primary-light);
        }

        .btn-secondary:active {
            transform: translateY(1px);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: #0F172A;
            color: #94A3B8;
            padding: 3.5rem 0 0;
        }

        .site-footer .footer-title {
            color: #E2E8F0;
            font-weight: 600;
            font-size: 1.0625rem;
            margin-bottom: 1rem;
        }

        .site-footer a {
            color: #94A3B8;
            font-size: 0.9375rem;
            transition: color var(--transition);
            display: inline-block;
            padding: 0.25rem 0;
        }

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

        .site-footer .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.375rem;
        }

        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.15);
            padding: 1.5rem 0;
            font-size: 0.875rem;
            color: #64748B;
            text-align: center;
            margin-top: 2.5rem;
        }

        /* ========== 版权声明 ========== */
        .copyright-block {
            background: #F1F5F9;
            border: 1px solid var(--border);
            border-radius: 1rem;
            padding: 1.75rem;
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .copyright-block strong {
            color: var(--text-main);
        }

        /* ========== 观影指南步骤 ========== */
        .guide-step {
            display: flex;
            gap: 1.25rem;
            padding: 1.5rem;
            background: var(--card-bg);
            border-radius: 1rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(226, 232, 240, 0.6);
            transition: all var(--transition);
            height: 100%;
        }

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

        .guide-step .step-num {
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 0.75rem;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .guide-step .step-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 0.25rem;
        }

        .guide-step .step-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== 响应式微调 ========== */
        @media (max-width: 640px) {
            .hero-title {
                font-size: 1.625rem;
            }
            .hero-image-float {
                display: none;
            }
            .metric-card {
                padding: 1.25rem 0.875rem;
            }
            .metric-value {
                font-size: 1.875rem;
            }
            .compare-card {
                padding: 1.375rem;
            }
            .form-card {
                padding: 1.375rem;
            }
            .hot-item .downloads {
                font-size: 0.75rem;
            }
        }

        @media (max-width: 480px) {
            .container-custom {
                padding-left: 0.875rem;
                padding-right: 0.875rem;
            }
            .hero-cta {
                flex-direction: column;
            }
            .hero-cta .btn-primary,
            .hero-cta .btn-secondary {
                width: 100%;
            }
        }

        /* ========== 滚动条与细节 ========== */
        ::selection {
            background: rgba(37, 99, 235, 0.15);
        }

/* roulang page: category1 */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #EFF6FF;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --text-main: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --success: #10B981;
    --danger: #F87171;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 10px rgba(15, 23, 42, 0.07);
    --shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.08);
    --shadow-brand: 0 8px 30px rgba(37, 99, 235, 0.12);
    --transition: 200ms ease;
}
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}
img {
    max-width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}
input, select, textarea {
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}
.container-custom {
    max-width: 80rem;
    margin: 0 auto;
    padding-left: 1rem;
    padding-right: 1rem;
}
@media (min-width: 640px) {
    .container-custom {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}
@media (min-width: 1024px) {
    .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}
/* ========== 导航 ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--transition);
}
.site-header.scrolled {
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
    white-space: nowrap;
    display: flex;
    align-items: baseline;
    gap: 2px;
}
.logo-text .logo-suffix {
    color: var(--text-main);
    font-weight: 700;
}
.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    transition: background var(--transition);
}
.nav-toggle:hover {
    background: var(--primary-light);
}
.nav-toggle svg {
    width: 22px;
    height: 22px;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 10px;
    transition: all var(--transition);
    display: inline-block;
}
.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}
.nav-link.active {
    color: var(--primary);
    font-weight: 600;
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
}
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
    padding: 1rem 1.5rem 1.5rem;
    flex-direction: column;
    gap: 0.25rem;
}
.mobile-menu.open {
    display: flex;
}
.mobile-menu a {
    display: block;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-main);
    border-radius: 12px;
    min-height: 48px;
    line-height: 1.4;
    transition: all var(--transition);
}
.mobile-menu a:hover {
    background: var(--primary-light);
    color: var(--primary);
}
.mobile-menu a.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}
@media (max-width: 767px) {
    .nav-links {
        display: none !important;
    }
    .nav-toggle {
        display: inline-flex;
    }
}
/* ========== 区块通用 ========== */
.section-padding {
    padding: 4rem 0;
}
@media (min-width: 768px) {
    .section-padding {
        padding: 6rem 0;
    }
}
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.875rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
}
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-main);
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
}
@media (min-width: 768px) {
    .section-title {
        font-size: 2.25rem;
    }
}
.section-subtitle {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    max-width: 42rem;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}
/* ========== 按钮 ========== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    transition: all var(--transition);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
    border: none;
    cursor: pointer;
    text-align: center;
    line-height: 1.5;
    min-height: 44px;
}
.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
    transform: translateY(-1px);
}
.btn-primary:active {
    transform: translateY(0) scale(0.98);
}
.btn-primary:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--primary);
    font-weight: 600;
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    border: 1.5px solid var(--primary);
    transition: all var(--transition);
    cursor: pointer;
    text-align: center;
    line-height: 1.5;
    min-height: 44px;
}
.btn-secondary:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}
.btn-secondary:active {
    transform: translateY(0) scale(0.98);
}
.btn-secondary:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}
/* ========== 分类页头部 ========== */
.category-hero {
    background: linear-gradient(135deg, #EFF6FF 0%, #F8FAFC 100%);
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.category-hero::before {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.06);
}
.category-hero::after {
    content: '';
    position: absolute;
    bottom: -60px;
    left: 10%;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.04);
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition);
}
.breadcrumb a:hover {
    color: var(--primary);
}
.breadcrumb .sep {
    color: var(--text-muted);
}
.breadcrumb .current {
    color: var(--primary);
    font-weight: 500;
}
.category-h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.25;
    color: var(--text-main);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}
@media (min-width: 768px) {
    .category-h1 {
        font-size: 2.5rem;
    }
}
.category-desc {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    max-width: 48rem;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}
/* ========== 资源卡片 ========== */
.resource-card {
    display: flex;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    min-height: 180px;
    position: relative;
}
.resource-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}
.resource-cover {
    width: 140px;
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
    background: var(--primary-light);
}
.resource-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
.resource-card:hover .resource-cover img {
    transform: scale(1.05);
}
.resource-info {
    flex: 1;
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 0;
}
.resource-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.125rem;
}
.resource-excerpt {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.resource-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 0.25rem;
}
.tag-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.625rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.4;
}
.tag-badge.hot {
    background: #FEF3C7;
    color: #D97706;
}
.tag-badge.green {
    background: #D1FAE5;
    color: #059669;
}
.resource-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}
.resource-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.resource-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: auto;
    padding-top: 0.5rem;
}
.btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.625rem;
    padding: 0.5rem 1rem;
    min-height: 38px;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.18);
}
.btn-download:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    transform: translateY(-1px);
}
.btn-download:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}
.btn-detail {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.625rem;
    padding: 0.5rem 1rem;
    min-height: 38px;
    transition: all var(--transition);
    border: 1px solid var(--border);
    cursor: pointer;
}
.btn-detail:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}
/* ========== 侧边栏 ========== */
.sidebar-widget {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    transition: box-shadow var(--transition);
}
.sidebar-widget:hover {
    box-shadow: var(--shadow-md);
}
.widget-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    position: relative;
}
.widget-title::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 32px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
}
.search-box {
    display: flex;
    gap: 0.5rem;
}
.search-input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-main);
    background: var(--bg);
    transition: all var(--transition);
    min-height: 44px;
}
.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    background: #fff;
}
.search-input::placeholder {
    color: var(--text-muted);
}
.search-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    border-radius: 0.75rem;
    width: 44px;
    min-height: 44px;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    flex-shrink: 0;
}
.search-btn:hover {
    background: var(--primary-dark);
}
.search-btn:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.tag-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.875rem;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all var(--transition);
    min-height: 36px;
}
.tag-chip:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}
.tag-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.recommend-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
    align-items: center;
}
.recommend-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.recommend-item:first-child {
    padding-top: 0;
}
.recommend-item:hover {
    background: var(--primary-light);
    border-radius: 0.5rem;
    padding-left: 0.375rem;
    padding-right: 0.375rem;
}
.recommend-cover {
    width: 72px;
    height: 54px;
    border-radius: 0.5rem;
    overflow: hidden;
    flex-shrink: 0;
}
.recommend-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.recommend-info {
    flex: 1;
    min-width: 0;
}
.recommend-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.125rem;
}
.recommend-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}
/* ========== 分页器 ========== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}
.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 0.625rem;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
}
.page-link:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}
.page-link.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
}
.page-link.prev, .page-link.next {
    font-size: 1.125rem;
    color: var(--text-secondary);
}
.page-link:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}
/* ========== CTA条 ========== */
.cta-banner {
    background: var(--primary);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    position: relative;
    overflow: hidden;
    text-align: center;
}
.cta-banner::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -30px;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}
.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -40px;
    left: 10%;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
}
.cta-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}
.cta-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}
.cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    color: var(--primary);
    font-weight: 600;
    border-radius: 0.75rem;
    padding: 0.75rem 2rem;
    font-size: 0.9375rem;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    cursor: pointer;
    border: none;
    min-height: 44px;
    position: relative;
    z-index: 1;
}
.cta-btn:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}
.cta-btn:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}
/* ========== 页脚 ========== */
.site-footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 4rem 0 0;
    margin-top: 4rem;
}
.footer-title {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
}
.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.footer-links a {
    color: #94A3B8;
    font-size: 0.875rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
    padding: 0.25rem 0;
    min-height: 30px;
    line-height: 1.6;
}
.footer-links a:hover {
    color: #fff;
    padding-left: 4px;
}
.footer-bottom {
    margin-top: 3rem;
    padding: 1.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
    font-size: 0.8125rem;
    color: #64748B;
}
/* ========== 响应式 ========== */
@media (max-width: 1023px) {
    .resource-card {
        min-height: 160px;
    }
    .resource-cover {
        width: 120px;
    }
}
@media (max-width: 767px) {
    .nav-links {
        display: none !important;
    }
    .nav-toggle {
        display: inline-flex;
    }
    .category-h1 {
        font-size: 1.625rem;
    }
    .resource-card {
        flex-direction: column;
        min-height: 0;
    }
    .resource-cover {
        width: 100%;
        height: 180px;
    }
    .resource-info {
        padding: 1rem 1.25rem 1.25rem;
    }
    .resource-actions {
        flex-wrap: wrap;
    }
    .btn-download, .btn-detail {
        flex: 1;
        min-height: 44px;
    }
    .cta-banner {
        padding: 2rem 1rem;
    }
}
@media (max-width: 520px) {
    .container-custom {
        padding-left: 0.875rem;
        padding-right: 0.875rem;
    }
    .section-padding {
        padding: 3rem 0;
    }
    .resource-meta {
        gap: 0.375rem 0.75rem;
    }
}