:root {
            --f8a5-primary: #FF4D4F;
            --f8a5-primary-hover: #FF7875;
            --f8a5-bg: #FFFFFF;
            --f8a5-secondary-bg: #F5F7FA;
            --f8a5-text-main: #2D3436;
            --f8a5-text-muted: #636E72;
            --f8a5-glass: rgba(255, 255, 255, 0.85);
            --f8a5-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --f8a5-radius: 16px;
            --f8a5-container-width: 1300px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
            color: var(--f8a5-text-main);
            background-color: var(--f8a5-bg);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* 布局基础 */
        .f8a5-container {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .f8a5-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--f8a5-glass);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .f8a5-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

        .f8a5-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .f8a5-logo img {
            height: 32px;
            width: auto;
            display: block;
        }

        .f8a5-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .f8a5-menu li {
            min-width: 0;
        }

        .f8a5-menu a {
            text-decoration: none;
            color: var(--f8a5-text-main);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
            white-space: nowrap;
        }

        .f8a5-menu a:hover, .f8a5-menu a.f8a5-active {
            color: var(--f8a5-primary);
        }

        /* Hero 区域 - 独特视觉设计 */
        .f8a5-hero {
            padding: 160px 0 100px;
            background: radial-gradient(circle at 90% 10%, rgba(255, 77, 79, 0.05) 0%, rgba(255, 255, 255, 0) 50%),
                        radial-gradient(circle at 10% 90%, rgba(255, 77, 79, 0.03) 0%, rgba(255, 255, 255, 0) 50%);
            position: relative;
            text-align: center;
        }

        .f8a5-hero-content {
            max-width: 900px;
            margin: 0 auto;
            word-break: break-word;
        }

        .f8a5-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            background: linear-gradient(135deg, #2D3436 0%, #FF4D4F 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .f8a5-hero p {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--f8a5-text-muted);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 搜索/分类 磁贴布局 */
        .f8a5-search-box {
            background: #fff;
            padding: 8px;
            border-radius: 50px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.06);
            display: flex;
            flex-wrap: wrap;
            max-width: 600px;
            margin: 0 auto 64px;
            border: 1px solid rgba(0,0,0,0.05);
        }

        .f8a5-search-box input {
            flex: 1;
            border: none;
            padding: 0 24px;
            font-size: 16px;
            outline: none;
            min-width: 200px;
            border-radius: 50px;
        }

        .f8a5-search-btn {
            background: var(--f8a5-primary);
            color: white;
            border: none;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, background 0.3s;
        }

        .f8a5-search-btn:hover {
            background: var(--f8a5-primary-hover);
            transform: translateY(-2px);
        }

        /* 细胞词库分类展示 */
        .f8a5-category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 48px;
        }

        .f8a5-cat-card {
            background: var(--f8a5-bg);
            border: 1px solid rgba(0,0,0,0.04);
            padding: 40px 32px;
            border-radius: var(--f8a5-radius);
            text-align: left;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            position: relative;
            overflow: hidden;
            word-break: break-word;
        }

        .f8a5-cat-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--f8a5-shadow);
            border-color: var(--f8a5-primary);
        }

        .f8a5-cat-icon {
            width: 56px;
            height: 56px;
            background: var(--f8a5-secondary-bg);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--f8a5-primary);
        }

        .f8a5-cat-card h3 {
            font-size: 20px;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .f8a5-cat-card p {
            font-size: 14px;
            color: var(--f8a5-text-muted);
            margin-bottom: 20px;
        }

        .f8a5-cat-link {
            color: var(--f8a5-primary);
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
        }

        /* 热门下载列表 */
        .f8a5-section {
            padding: 96px 0;
            word-break: break-word;
        }

        .f8a5-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .f8a5-section-title h2 {
            font-size: clamp(2rem, 3vw, 2.5rem);
            margin-bottom: 16px;
            font-weight: 800;
        }

        .f8a5-table-container {
            background: #fff;
            border-radius: var(--f8a5-radius);
            overflow: hidden;
            box-shadow: var(--f8a5-shadow);
        }

        .f8a5-list-item {
            display: flex;
            flex-wrap: wrap;
            padding: 24px 32px;
            border-bottom: 1px solid #f0f0f0;
            align-items: center;
            transition: background 0.2s;
        }

        .f8a5-list-item:hover {
            background: var(--f8a5-secondary-bg);
        }

        .f8a5-cell-name {
            flex: 2;
            min-width: 200px;
            font-weight: 600;
            font-size: 18px;
        }

        .f8a5-cell-info {
            flex: 3;
            min-width: 250px;
            font-size: 14px;
            color: var(--f8a5-text-muted);
            padding: 8px 0;
        }

        .f8a5-cell-action {
            flex: 1;
            min-width: 120px;
            text-align: right;
        }

        .f8a5-btn-outline {
            display: inline-block;
            padding: 8px 20px;
            border: 1px solid var(--f8a5-primary);
            color: var(--f8a5-primary);
            text-decoration: none;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 600;
            transition: all 0.3s;
        }

        .f8a5-btn-outline:hover {
            background: var(--f8a5-primary);
            color: #fff;
        }

        /* 特色功能 */
        .f8a5-features {
            background: var(--f8a5-secondary-bg);
            border-radius: 40px;
            margin: 0 24px;
            padding: 80px 48px;
        }

        .f8a5-feature-item {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            margin-bottom: 80px;
        }

        .f8a5-feature-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .f8a5-feature-visual {
            flex: 1;
            min-width: 300px;
            height: 300px;
            background: linear-gradient(135deg, #fff 0%, #fdeaea 100%);
            border-radius: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .f8a5-feature-visual::after {
            content: '';
            position: absolute;
            width: 80%;
            height: 80%;
            border: 2px dashed var(--f8a5-primary);
            opacity: 0.2;
            border-radius: 50%;
        }

        .f8a5-feature-text {
            flex: 1;
            min-width: 300px;
        }

        .f8a5-feature-text h3 {
            font-size: 32px;
            margin-bottom: 24px;
            font-weight: 700;
        }

        /* 页脚 */
        .f8a5-footer {
            background: #1d1d1f;
            color: #fff;
            padding: 80px 0 40px;
            margin-top: 80px;
        }

        .f8a5-footer-content {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
            margin-bottom: 64px;
        }

        .f8a5-footer-brand {
            flex: 2;
            min-width: 250px;
        }

        .f8a5-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            color: #fff;
        }

        .f8a5-footer-links {
            flex: 3;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 300px;
        }

        .f8a5-footer-group h4 {
            font-size: 16px;
            margin-bottom: 24px;
            color: #999;
        }

        .f8a5-footer-group ul {
            list-style: none;
        }

        .f8a5-footer-group li {
            margin-bottom: 12px;
        }

        .f8a5-footer-group a {
            color: #ccc;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .f8a5-footer-group a:hover {
            color: var(--f8a5-primary);
        }

        .f8a5-copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 32px;
            text-align: center;
            color: #666;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .f8a5-nav-wrapper {
                height: auto;
                padding: 16px 0;
            }
            .f8a5-menu {
                width: 100%;
                margin-top: 16px;
                gap: 12px;
                justify-content: center;
            }
            .f8a5-hero {
                padding: 120px 0 60px;
            }
            .f8a5-feature-item {
                text-align: center;
                gap: 24px;
            }
            .f8a5-list-item {
                flex-direction: column;
                text-align: center;
                gap: 16px;
            }
            .f8a5-cell-action {
                text-align: center;
            }
        }