:root {
            --f8a5-primary: #EE4126;
            --f8a5-primary-hover: #D6361D;
            --f8a5-bg: #F5F5F7;
            --f8a5-text: #1D1D1F;
            --f8a5-text-light: #86868B;
            --f8a5-white: #FFFFFF;
            --f8a5-glass: rgba(255, 255, 255, 0.7);
            --f8a5-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
            --f8a5-radius: 18px;
            --f8a5-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--f8a5-bg);
            color: var(--f8a5-text);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        .f8a5-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }

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

        .f8a5-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 64px;
        }

        .f8a5-logo {
            flex-shrink: 0;
            min-width: 0;
            display: flex;
            align-items: center;
        }

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

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

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

        .f8a5-nav-menu a {
            text-decoration: none;
            color: var(--f8a5-text);
            font-size: 14px;
            font-weight: 500;
            transition: var(--f8a5-transition);
            padding: 8px 0;
            position: relative;
        }

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

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

        .f8a5-nav-menu a.f8a5-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--f8a5-primary);
            border-radius: 2px;
        }

        /* Hero 区块 */
        .f8a5-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            text-align: center;
            background: radial-gradient(circle at 50% 0%, rgba(238, 65, 38, 0.05) 0%, transparent 50%);
        }

        .f8a5-hero-content {
            max-width: 800px;
            margin: 0 auto;
            word-break: break-word;
        }

        .f8a5-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(180deg, #1d1d1f 0%, #434343 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .f8a5-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--f8a5-text-light);
            margin-bottom: 48px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 独特下载卡片 */
        .f8a5-download-card {
            background: var(--f8a5-white);
            border-radius: 24px;
            padding: 40px;
            box-shadow: var(--f8a5-shadow);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            margin-top: 20px;
            border: 1px solid rgba(255, 255, 255, 0.8);
            transition: var(--f8a5-transition);
        }

        .f8a5-download-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 48px rgba(0, 0, 0, 0.12);
        }

        .f8a5-card-info {
            flex: 1;
            min-width: 300px;
            text-align: left;
        }

        .f8a5-version-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(238, 65, 38, 0.1);
            color: var(--f8a5-primary);
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .f8a5-download-btn {
            display: inline-flex;
            align-items: center;
            padding: 18px 48px;
            background: var(--f8a5-primary);
            color: var(--f8a5-white);
            text-decoration: none;
            border-radius: 100px;
            font-size: 18px;
            font-weight: 600;
            transition: var(--f8a5-transition);
            box-shadow: 0 10px 20px rgba(238, 65, 38, 0.2);
        }

        .f8a5-download-btn:hover {
            background: var(--f8a5-primary-hover);
            transform: scale(1.02);
        }

        .f8a5-meta-info {
            margin-top: 12px;
            font-size: 12px;
            color: var(--f8a5-text-light);
        }

        /* Bento 风格功能网格 */
        .f8a5-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            padding: 64px 0;
        }

        .f8a5-feature-item {
            background: var(--f8a5-white);
            border-radius: var(--f8a5-radius);
            padding: 32px;
            transition: var(--f8a5-transition);
            border: 1px solid rgba(0, 0, 0, 0.03);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .f8a5-feature-item:hover {
            border-color: var(--f8a5-primary);
        }

        .f8a5-feature-icon {
            width: 48px;
            height: 48px;
            background: var(--f8a5-bg);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .f8a5-feature-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .f8a5-feature-desc {
            font-size: 15px;
            color: var(--f8a5-text-light);
            word-break: keep-all;
        }

        /* 图文交替展示区 */
        .f8a5-showcase {
            padding: 80px 0;
        }

        .f8a5-section {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

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

        .f8a5-section-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .f8a5-section-label {
            color: var(--f8a5-primary);
            font-weight: 700;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            display: block;
        }

        .f8a5-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
        }

        .f8a5-section-desc {
            font-size: 17px;
            color: var(--f8a5-text-light);
            margin-bottom: 32px;
        }

        .f8a5-section-visual {
            flex: 1;
            min-width: 300px;
            height: 360px;
            background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f7 100%);
            border-radius: 24px;
            position: relative;
            overflow: hidden;
            box-shadow: inset 0 0 40px rgba(0,0,0,0.02);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 模拟 Mac 窗口视觉效果 */
        .f8a5-mac-window {
            width: 85%;
            height: 70%;
            background: var(--f8a5-white);
            border-radius: 12px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.1);
            position: relative;
            padding-top: 30px;
        }

        .f8a5-window-dots {
            position: absolute;
            top: 12px;
            left: 12px;
            display: flex;
            gap: 6px;
        }

        .f8a5-dot {
            width: 9px;
            height: 9px;
            border-radius: 50%;
        }

        .f8a5-dot-r { background: #FF5F56; }
        .f8a5-dot-y { background: #FFBD2E; }
        .f8a5-dot-g { background: #27C93F; }

        /* 页脚 */
        .f8a5-footer {
            background: #1D1D1F;
            color: var(--f8a5-white);
            padding: 80px 0 40px;
        }

        .f8a5-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

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

        .f8a5-footer-links h4 {
            font-size: 14px;
            color: var(--f8a5-text-light);
            margin-bottom: 20px;
            text-transform: uppercase;
        }

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

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

        .f8a5-footer-links a {
            color: #d2d2d7;
            text-decoration: none;
            font-size: 14px;
            transition: var(--f8a5-transition);
        }

        .f8a5-footer-links a:hover {
            color: var(--f8a5-white);
        }

        .f8a5-footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 32px;
            text-align: center;
            font-size: 13px;
            color: var(--f8a5-text-light);
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .f8a5-nav-menu {
                display: none; /* 简化移动端，实际开发中应有汉堡菜单 */
            }

            .f8a5-hero {
                padding-top: 100px;
            }

            .f8a5-section {
                gap: 32px;
                margin-bottom: 64px;
            }

            .f8a5-section-visual {
                height: 280px;
            }
            
            .f8a5-download-card {
                padding: 24px;
                text-align: center;
            }

            .f8a5-card-info {
                text-align: center;
                min-width: 100%;
            }
        }