/* --- 全局基础样式 (黑白极简) --- */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
            background-color: #0a0a0a; /* 极深灰背景 */
            color: #ffffff;
            line-height: 1.6;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: 0.3s; }
        ul { list-style: none; }

        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* --- 导航栏 --- */
        header {
            background: rgba(10, 10, 10, 0.95);
            backdrop-filter: blur(10px);
            padding: 20px 0;
            position: sticky; top: 0; z-index: 100;
            border-bottom: 1px solid #222;
        }
        .nav-content { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 800; letter-spacing: -1px; }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a { color: #888; font-size: 14px; }
        .nav-links a:hover { color: #fff; }
        .btn-nav {
            padding: 8px 20px;
            background: #fff; color: #000;
            border-radius: 4px; font-weight: bold; font-size: 14px;
        }
        .btn-nav:hover { background: #ddd; }

        /* --- Hero 区域 (强调新人福利) --- */
        .hero {
            padding: 100px 0;
            text-align: center;
            background: radial-gradient(circle at center, #1a1a1a 0%, #0a0a0a 70%);
        }
        .badge-new {
            display: inline-block;
            background: #222;
            border: 1px solid #444;
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 12px;
            color: #aaa;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 18px;
            color: #888;
            max-width: 600px;
            margin: 0 auto 40px;
        }
        .cta-group { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
        .btn-primary {
            background: #fff; color: #000;
            padding: 15px 40px;
            font-size: 16px; font-weight: bold;
            border-radius: 8px;
            box-shadow: 0 0 20px rgba(255,255,255,0.1);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(255,255,255,0.2); }
        .btn-secondary {
            background: transparent; border: 1px solid #444; color: #fff;
            padding: 15px 40px;
            font-size: 16px; font-weight: bold;
            border-radius: 8px;
        }
        .btn-secondary:hover { border-color: #fff; }

        /* --- 核心数据展示 (低费率) --- */
        .stats-section {
            padding: 60px 0;
            border-top: 1px solid #222;
            border-bottom: 1px solid #222;
            background: #0f0f0f;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            text-align: center;
        }
        .stat-item h3 { font-size: 42px; font-weight: 800; color: #fff; margin-bottom: 10px; }
        .stat-item p { color: #666; font-size: 14px; text-transform: uppercase; letter-spacing: 1px; }

        /* --- 为什么选择我们 (图文混排) --- */
        .feature-split {
            padding: 100px 0;
            display: flex;
            align-items: center;
            gap: 60px;
        }
        .feature-text { flex: 1; }
        .feature-text h2 { font-size: 36px; margin-bottom: 20px; }
        .feature-text p { color: #888; margin-bottom: 30px; font-size: 16px; }
        .feature-list li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            color: #ccc;
        }
        .feature-list li::before {
            content: "✓";
            display: inline-flex;
            justify-content: center;
            align-items: center;
            width: 24px; height: 24px;
            background: #333;
            border-radius: 50%;
            margin-right: 15px;
            font-size: 12px;
            color: #fff;
        }
        .feature-image {
            flex: 1;
            height: 400px;
            background: #1a1a1a;
            border-radius: 20px;
            border: 1px solid #333;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #444;
            font-size: 24px;
            font-weight: bold;
        }

        /* --- 安全保障 (网格卡片) --- */
        .security-section { padding: 100px 0; }
        .section-title { text-align: center; margin-bottom: 60px; }
        .section-title h2 { font-size: 32px; margin-bottom: 10px; }
        .section-title p { color: #666; }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }
        .card {
            background: #161616;
            padding: 40px 30px;
            border-radius: 12px;
            border: 1px solid #2a2a2a;
            text-align: center;
            transition: 0.3s;
            /* 关键修复：Flex居中 */
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 280px;
        }
        .card:hover { border-color: #555; transform: translateY(-5px); }
        .card-icon {
            font-size: 30px; margin-bottom: 20px; color: #fff;
            background: #222; width: 60px; height: 60px;
            line-height: 60px; border-radius: 50%;
        }
        .card h3 { font-size: 18px; margin-bottom: 15px; color: #fff; }
        .card p { font-size: 14px; color: #888; line-height: 1.5; }

        /* --- 底部 --- */
        footer {
            padding: 60px 0;
            border-top: 1px solid #222;
            text-align: center;
            color: #444;
            font-size: 14px;
        }

        /* --- 响应式适配 --- */
        @media (max-width: 768px) {
            .hero h1 { font-size: 32px; }
            .nav-links { display: none; } /* 移动端隐藏菜单 */
            .stats-grid { grid-template-columns: 1fr; gap: 30px; }
            .feature-split { flex-direction: column; }
            .feature-image { width: 100%; height: 250px; }
        }