* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部导航 */
        .header {
            background: #ff2849; /* 只有导航栏使用 #ff2849 */
            padding: 15px 0;
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }
        
        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: white;
            text-decoration: none;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: white;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: #f0f0f0;
        }
        
        .download-btn {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 10px 20px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        
        .download-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }
        
        /* 主要内容区域 */
        .hero {
            padding: 120px 0 80px;
            text-align: center;
            color: white;
        }
        
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        
        .btn {
            padding: 15px 30px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        
        .btn-primary {
            background: white;
            color: #667eea; /* 蓝色主题 */
        }
        
        .btn-secondary {
            background: transparent;
            color: white;
            border: 2px solid white;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
        }
        
        /* 特色功能 */
        .features {
            padding: 80px 0;
            background: white;
        }
        
        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: 50px;
            color: #333;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background: #f8f9fa;
            padding: 40px 30px;
            border-radius: 15px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        
        .feature-icon {
            font-size: 3rem;
            margin-bottom: 20px;
            color: #667eea; /* 蓝色主题 */
        }
        
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: #333;
        }
        
        /* 使用步骤 */
        .steps {
            padding: 80px 0;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
        }
        
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        
        .step-card {
            text-align: center;
            padding: 30px;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(45deg, #667eea, #764ba2); /* 蓝色渐变 */
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin: 0 auto 20px;
        }
        
        /* 下载区域 */
        .download-section {
            padding: 100px 0;
            text-align: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); /* 蓝色渐变 */
            color: white;
        }
        
        .download-section h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .download-section p {
            font-size: 1.2rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }
        
        .app-stores {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        
        .app-store-btn {
            background: white;
            color: #667eea; /* 蓝色主题 */
            padding: 15px 30px;
            border-radius: 10px;
            text-decoration: none;
            font-weight: bold;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: transform 0.3s;
        }
        
        .app-store-btn:hover {
            transform: translateY(-3px);
        }
        
        /* App预览图 */
        .app-preview {
            max-width: 300px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            padding: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
        }
        
        .app-preview img {
            width: 100%;
            height: auto;
            border-radius: 15px;
            display: block;
        }
        
        /* 页脚 */
        .footer {
            background: #333;
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section ul li {
            margin-bottom: 10px;
        }
        
        .footer-section a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-section a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #555;
            color: #ccc;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav {
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: space-between;
                align-items: center;
                padding: 0 10px;
            }
            
            .logo {
                order: 1;
                font-size: 20px;
            }
            
            .nav-links {
                order: 2;
                margin: 10px 0;
                width: 100%;
                justify-content: center;
            }
            
            .nav-links li {
                margin: 0 10px;
            }
            
            .download-btn {
                order: 3;
                margin-top: 10px;
            }
            
            .hero {
                padding: 140px 0 60px;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .app-stores {
                flex-direction: column;
                align-items: center;
            }
        }