/* 全局样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: #f5f5f5;
            color: #333;
            line-height: 1.6;
        }

        /* 导航栏 */
        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            padding: 20px 0;
            text-align: center;
        }
        header h1 {
            font-size: 24px;
            color: #333;
        }
        header .logo {
            font-size: 28px;
            color: #4a90e2;
            margin-bottom: 10px;
        }

        /* 英雄区域 (第一屏) */
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-align: center;
            padding: 80px 20px;
        }
        .hero h2 {
            font-size: 36px;
            margin-bottom: 20px;
        }
        .hero p {
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto 40px;
            opacity: 0.9;
        }
        .btn {
            background: #ff6b6b;
            color: white;
            padding: 12px 30px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background: #ee5a52;
            transform: translateY(-2px);
        }

        /* 图片区 */
        .section {
            padding: 60px 20px;
            max-width: 800px;
            margin: 0 auto;
        }
        .section h3 {
            text-align: center;
            font-size: 32px;
            margin-bottom: 50px;
            color: #333;
        }
        .image-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin-top: 20px;
        }
        .image-item {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .image-item:hover {
            transform: scale(1.02);
        }
        .image-item img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 功能列表 */
        .features {
            background-color: #fff;
            padding: 60px 20px;
        }
        .features-container {
            max-width: 800px;
            margin: 0 auto;
        }
        .feature-item {
            display: flex;
            align-items: center;
            margin-bottom: 40px;
            padding: 20px;
            background: #f9f9f9;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
        }
        .feature-icon {
            font-size: 24px;
            color: #4a90e2;
            margin-right: 20px;
            font-weight: bold;
        }
        .feature-text h4 {
            font-size: 22px;
            margin-bottom: 10px;
            color: #333;
        }
        .feature-text p {
            color: #666;
            font-size: 16px;
        }

        /* 下载区域 */
        .download {
            background: linear-gradient(to right, #4facfe, #00f2fe);
            color: white;
            text-align: center;
            padding: 60px 20px;
        }
        .download h3 {
            font-size: 32px;
            margin-bottom: 20px;
        }
        .download p {
            font-size: 18px;
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .qr-placeholder {
            width: 200px;
            height: 200px;
            background-color: rgba(255,255,255,0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            border-radius: 10px;
            border: 2px dashed rgba(255,255,255,0.3);
        }

        /* 页脚 */
        footer {
            background-color: #222;
            color: #999;
            text-align: center;
            padding: 30px 20px;
            font-size: 14px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .hero h2 { font-size: 28px; }
            .section h3 { font-size: 28px; }
            .image-grid { grid-template-columns: 1fr; }
        }