:root {
            --fti6a-primary: #ff4d4f;
            --fti6a-primary-hover: #ff7875;
            --fti6a-accent: #ff7a45;
            --fti6a-text-main: #262626;
            --fti6a-text-secondary: #595959;
            --fti6a-bg-light: #f5f5f5;
            --fti6a-white: #ffffff;
            --fti6a-safe-green: #52c41a;
            --fti6a-container-width: 1100px;
            --fti6a-base-unit: 8px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--fti6a-text-main);
            line-height: 1.8;
            background-color: var(--fti6a-white);
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 */
        .fti6a-nav-wrapper {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            box-shadow: 0 2px 20px rgba(0,0,0,0.03);
        }

        .fti6a-nav-container {
            max-width: var(--fti6a-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
        }

        .fti6a-logo {
            min-width: 0;
            display: flex;
            align-items: center;
        }

        .fti6a-logo img {
            height: 36px;
            width: auto;
        }

        .fti6a-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .fti6a-nav-menu a {
            text-decoration: none;
            color: var(--fti6a-text-main);
            font-weight: 500;
            font-size: clamp(0.9rem, 1vw + 0.1rem, 1rem);
            transition: color 0.3s;
        }

        .fti6a-nav-menu a:hover {
            color: var(--fti6a-primary);
        }

        /* Hero 区 - 独特卡片式悬浮布局 */
        .fti6a-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at 10% 20%, rgba(255, 77, 79, 0.05) 0%, rgba(255, 255, 255, 1) 90%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            text-align: center;
        }

        .fti6a-hero-content {
            max-width: 900px;
            min-width: 0;
        }

        .fti6a-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 77, 79, 0.1);
            color: var(--fti6a-primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .fti6a-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--fti6a-text-main);
            word-break: keep-all;
        }

        .fti6a-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.3rem);
            color: var(--fti6a-text-secondary);
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 核心安全区块 - 非对称网格 */
        .fti6a-section {
            padding: 80px 24px;
            max-width: var(--fti6a-container-width);
            margin: 0 auto;
        }

        .fti6a-security-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .fti6a-card {
            background: var(--fti6a-white);
            border: 1px solid rgba(0,0,0,0.06);
            border-radius: 20px;
            padding: 40px;
            transition: transform 0.3s, box-shadow 0.3s;
            min-width: 0;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .fti6a-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--fti6a-primary);
        }

        .fti6a-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
            color: var(--fti6a-primary);
        }

        .fti6a-card-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--fti6a-text-main);
        }

        .fti6a-card-text {
            color: var(--fti6a-text-secondary);
            font-size: 1rem;
        }

        /* 隐私承诺 - 全屏色块 */
        .fti6a-manifesto {
            background: #1a1a1a;
            color: var(--fti6a-white);
            padding: 96px 24px;
            margin: 64px 0;
            border-radius: 40px;
            text-align: center;
        }

        .fti6a-manifesto-container {
            max-width: 800px;
            margin: 0 auto;
            min-width: 0;
        }

        .fti6a-manifesto-title {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            margin-bottom: 32px;
        }

        .fti6a-manifesto-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px;
            list-style: none;
            margin-top: 48px;
        }

        .fti6a-manifesto-item {
            flex: 1;
            min-width: 200px;
            padding: 24px;
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 16px;
        }

        .fti6a-manifesto-num {
            display: block;
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--fti6a-primary);
            margin-bottom: 8px;
        }

        /* 动态内容区 - 常见问题 */
        .fti6a-faq-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .fti6a-faq-header h2 {
            font-size: 2.5rem;
            margin-bottom: 16px;
        }

        .fti6a-faq-list {
            max-width: 900px;
            margin: 0 auto;
        }

        .fti6a-faq-item {
            margin-bottom: 24px;
            border-bottom: 1px solid #eee;
            padding-bottom: 24px;
        }

        .fti6a-faq-q {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--fti6a-text-main);
            display: flex;
            align-items: flex-start;
        }

        .fti6a-faq-q::before {
            content: "Q";
            color: var(--fti6a-primary);
            margin-right: 12px;
            font-weight: 800;
        }

        .fti6a-faq-a {
            color: var(--fti6a-text-secondary);
            padding-left: 28px;
        }

        /* 尾部 */
        .fti6a-footer {
            background: #f9f9f9;
            padding: 80px 24px 40px;
            margin-top: 80px;
        }

        .fti6a-footer-container {
            max-width: var(--fti6a-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .fti6a-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .fti6a-footer-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--fti6a-primary);
            margin-bottom: 16px;
        }

        .fti6a-footer-links {
            flex: 2;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .fti6a-footer-col h4 {
            margin-bottom: 24px;
            font-size: 1rem;
        }

        .fti6a-footer-col ul {
            list-style: none;
        }

        .fti6a-footer-col li {
            margin-bottom: 12px;
        }

        .fti6a-footer-col a {
            text-decoration: none;
            color: var(--fti6a-text-secondary);
            transition: color 0.3s;
        }

        .fti6a-footer-col a:hover {
            color: var(--fti6a-primary);
        }

        .fti6a-copyright {
            width: 100%;
            text-align: center;
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid #eee;
            color: #999;
            font-size: 0.9rem;
        }

        /* 按钮组件 */
        .fti6a-btn {
            display: inline-block;
            padding: 14px 36px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
        }

        .fti6a-btn-primary {
            background: linear-gradient(135deg, var(--fti6a-primary), var(--fti6a-accent));
            color: var(--fti6a-white);
            box-shadow: 0 10px 20px rgba(255, 77, 79, 0.2);
        }

        .fti6a-btn-primary:hover {
            transform: scale(1.05);
            box-shadow: 0 15px 30px rgba(255, 77, 79, 0.3);
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .fti6a-nav-menu {
                display: none; /* 简化移动端，实际可添加汉堡菜单 */
            }
            .fti6a-hero {
                padding-top: 120px;
            }
            .fti6a-manifesto-item {
                flex: 100%;
            }
            .fti6a-footer-container {
                flex-direction: column;
            }
        }