:root {
            --f8a5-primary: #ff6600;
            --f8a5-primary-hover: #e65c00;
            --f8a5-bg: #ffffff;
            --f8a5-text-dark: #1d1d1f;
            --f8a5-text-light: #86868b;
            --f8a5-section-alt: #f5f5f7;
            --f8a5-card-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --f8a5-container-width: 1300px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
            background-color: var(--f8a5-bg);
            color: var(--f8a5-text-dark);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 */
        .f8a5-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .f8a5-nav-container {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

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

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

        .f8a5-nav-list li {
            min-width: 0;
        }

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

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

        /* Hero 区块 */
        .f8a5-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            background: radial-gradient(circle at top right, rgba(255, 102, 0, 0.05), transparent 40%),
                        radial-gradient(circle at bottom left, rgba(255, 102, 0, 0.03), transparent 30%);
            text-align: center;
            overflow: hidden;
        }

        .f8a5-hero-inner {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .f8a5-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
            word-break: keep-all;
        }

        .f8a5-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
            color: var(--f8a5-text-light);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
            word-break: keep-all;
        }

        .f8a5-hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .f8a5-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 40px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            min-width: 200px;
        }

        .f8a5-btn-primary {
            background: var(--f8a5-primary);
            color: white;
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.2);
        }

        .f8a5-btn-primary:hover {
            transform: translateY(-3px);
            background: var(--f8a5-primary-hover);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.3);
        }

        /* 核心特色网格 */
        .f8a5-section {
            padding: 96px 24px;
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
        }

        .f8a5-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .f8a5-card {
            background: var(--f8a5-bg);
            border: 1px solid rgba(0,0,0,0.05);
            border-radius: 24px;
            padding: 48px;
            transition: all 0.4s ease;
            min-width: 0;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .f8a5-card:hover {
            border-color: var(--f8a5-primary);
            transform: translateY(-10px);
            box-shadow: var(--f8a5-card-shadow);
        }

        .f8a5-card-tag {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            color: var(--f8a5-primary);
            margin-bottom: 16px;
            letter-spacing: 0.1em;
        }

        .f8a5-card-title {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .f8a5-card-desc {
            color: var(--f8a5-text-light);
            font-size: 16px;
            margin-bottom: 32px;
        }

        /* 交错排版区块 */
        .f8a5-feature-row {
            display: flex;
            align-items: center;
            gap: 64px;
            margin-bottom: 120px;
            flex-wrap: wrap;
        }

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

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

        .f8a5-feature-media {
            flex: 1;
            min-width: 300px;
            background: var(--f8a5-section-alt);
            border-radius: 32px;
            aspect-ratio: 4/3;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .f8a5-feature-media span {
            font-size: 120px;
            font-weight: 800;
            color: rgba(255, 102, 0, 0.1);
        }

        .f8a5-feature-title {
            font-size: 42px;
            font-weight: 700;
            margin-bottom: 24px;
            line-height: 1.2;
        }

        .f8a5-feature-text {
            font-size: 18px;
            color: var(--f8a5-text-light);
            margin-bottom: 32px;
        }

        /* 动态内容区块 */
        .f8a5-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .f8a5-section-title h2 {
            font-size: 48px;
            font-weight: 700;
        }

        /* 页脚 */
        .f8a5-footer {
            background: var(--f8a5-text-dark);
            color: #ffffff;
            padding: 96px 24px 48px;
        }

        .f8a5-footer-inner {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            justify-content: space-between;
        }

        .f8a5-footer-brand {
            flex: 1;
            min-width: 200px;
        }

        .f8a5-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .f8a5-footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .f8a5-footer-col {
            min-width: 150px;
        }

        .f8a5-footer-col h4 {
            font-size: 16px;
            margin-bottom: 24px;
            color: rgba(255,255,255,0.5);
        }

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

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

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

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

        .f8a5-copyright {
            margin-top: 96px;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 14px;
            color: rgba(255,255,255,0.4);
            text-align: center;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .f8a5-nav-list {
                display: none; /* 简化移动端，实际开发中应有汉堡菜单 */
            }
            .f8a5-hero-inner {
                padding: 0 16px;
            }
            .f8a5-feature-row {
                flex-direction: column !important;
                gap: 32px;
            }
            .f8a5-grid {
                grid-template-columns: 1fr;
            }
            .f8a5-feature-title {
                font-size: 32px;
            }
        }