:root {
            --primary-pink: #ff0055;    /* 图标主玫红 */
            --accent-blue: #40c4ff;     /* 图标底部天蓝 */
            --bg-light: #fff9fa;        /* 极浅粉背景 */
            --text-dark: #2d2d2d;
            --text-gray: #666666;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; scroll-behavior: smooth; }
        body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background: #fff; color: var(--text-dark); line-height: 1.6; }
        a { text-decoration: none; color: inherit; }
        li { list-style: none; }

        /* --- 导航栏 --- */
        nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 10%;
            height: 70px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .logo { display: flex; align-items: center; font-size: 22px; font-weight: bold; color: var(--primary-pink); }
        .logo img { height: 40px; border-radius: 8px; margin-right: 10px; }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a:hover { color: var(--primary-pink); }

        /* --- 下载区域 (Hero Section) --- */
        .hero {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 80px 10%;
            background: linear-gradient(135deg, #fff 0%, var(--bg-light) 100%);
        }
        .hero-text { flex: 1; }
        .hero-text .version-tag { 
            display: inline-block; 
            background: var(--accent-blue); 
            color: #fff; 
            padding: 4px 12px; 
            border-radius: 4px; 
            font-size: 14px; 
            margin-bottom: 15px;
            font-weight: bold;
        }
        .hero-text h1 { font-size: 48px; color: var(--primary-pink); margin-bottom: 20px; line-height: 1.2; }
        .hero-text p { font-size: 18px; color: var(--text-gray); margin-bottom: 40px; }
        
        .download-btns { display: flex; gap: 20px; }
        .btn {
            display: flex; align-items: center; justify-content: center;
            width: 200px; height: 56px; border-radius: 12px;
            color: #fff; font-weight: bold; font-size: 16px; transition: 0.3s;
            box-shadow: 0 6px 15px rgba(0,0,0,0.1);
        }
        .btn-android { background: var(--primary-pink); }
        .btn-ios { background: #222; }
        .btn:hover { transform: translateY(-3px); filter: brightness(1.1); }

        .hero-img { flex: 1; text-align: right; }
        .hero-img img { width: 300px; border-radius: 30px; box-shadow: 0 20px 50px rgba(255, 0, 85, 0.1); }

        /* --- 功能介绍 --- */
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 32px; color: var(--primary-pink); }
        .features { padding: 80px 10%; background: #fff; }
        .feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
        .f-card { text-align: center; padding: 40px 20px; border-radius: 20px; background: var(--bg-light); border: 1px solid transparent; transition: 0.3s; }
        .f-card:hover { border-color: var(--primary-pink); background: #fff; }
        .f-card .iconfont { font-size: 45px; color: var(--primary-pink); display: block; margin-bottom: 20px; }

        /* --- 常见问题 & 更新日志 (左右布局) --- */
        .info-box { padding: 80px 10%; background: var(--bg-light); display: flex; gap: 50px; }
        .faq, .changelog { flex: 1; }
        .info-item { background: #fff; padding: 20px; border-radius: 12px; margin-bottom: 15px; }
        .info-item h4 { color: var(--primary-pink); margin-bottom: 8px; border-left: 4px solid var(--accent-blue); padding-left: 10px; }
        .changelog ul li { margin-bottom: 10px; padding-left: 15px; position: relative; }
        .changelog ul li::before { content: "•"; color: var(--primary-pink); position: absolute; left: 0; }

        footer { padding: 40px; text-align: center; background: #fff; color: #999; border-top: 1px solid #eee; }

        /* --- 响应式适配 --- */
        @media (max-width: 768px) {
            nav { padding: 0 5%; }
            .nav-links { display: none; } /* 移动端隐藏简单导航 */
            .hero { flex-direction: column; padding: 40px 20px; text-align: center; }
            .hero-text h1 { font-size: 32px; }
            .download-btns { flex-direction: column; align-items: center; margin-bottom: 40px; width: 100%; }
            .btn { width: 100%; max-width: 280px; }
            hero-img {
        order: 3;
        width: 100%;
        text-align: center;
        padding-right: 0; 
        margin: 0 auto;
    }

    .hero-img img {
        width: 80%;
        max-width: 280px;
        display: inline-block;
        margin-right: 0;
    }
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
            .info-box { flex-direction: column; padding: 40px 20px; }
        }