* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary: #3498db;
            --primary-light: #5dade2;
            --primary-dark: #2980b9;
            --secondary: #2c3e50;
            --accent: #1abc9c;
            --light: #ffffff;
            --light-bg: #f8f9fa;
            --text: #2c3e50;
            --text-light: #7f8c8d;
        }
        
        body {
            background: linear-gradient(135deg, #e3f2fd 0%, #f0f8ff 100%);
            color: var(--text);
            min-height: 100vh;
            overflow-x: hidden;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏 */
        header {
            padding: 20px 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        
        header.scrolled {
            padding: 15px 0;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }
        
        .logo-img {
            height: 40px;
            width: auto;
            filter: drop-shadow(0 2px 4px rgba(52, 152, 219, 0.3));
        }
        
        .nav-links {
            display: flex;
            gap: 30px;
        }
        
        .nav-links a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }
        
        .nav-links a:after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--primary);
        }
        
        .nav-links a:hover:after {
            width: 100%;
        }
        
        /* 主内容区 */
        .hero {
            padding: 180px 0 100px;
            text-align: center;
            position: relative;
        }
        
        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            color: var(--secondary);
            animation: fadeInUp 1s ease;
        }
        
        .tagline {
            font-size: 1.5rem;
            margin-bottom: 30px;
            color: var(--primary);
            font-weight: 500;
            animation: fadeInUp 1s ease 0.2s both;
        }
        
        .description {
            font-size: 1.2rem;
            line-height: 1.6;
            margin-bottom: 40px;
            color: var(--text-light);
            animation: fadeInUp 1s ease 0.4s both;
        }
        
        /* 下载按钮 */
        .download-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
            animation: fadeInUp 1s ease 0.6s both;
        }
        
        .btn {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 15px 30px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            text-decoration: none;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            position: relative;
            overflow: hidden;
        }
        
        .btn:before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
            transition: left 0.5s;
        }
        
        .btn:hover:before {
            left: 100%;
        }
        
        .btn-android {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
        }
        
        .btn-ios {
            background: linear-gradient(135deg, var(--secondary), #34495e);
            color: white;
        }
        
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
        }
        
        /* 特性展示 */
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 80px;
        }
        
        .feature-card {
            background: white;
            border-radius: 15px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            position: relative;
            overflow: hidden;
        }
        
        .feature-card:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--primary);
            background: rgba(52, 152, 219, 0.1);
            width: 80px;
            height: 80px;
            line-height: 80px;
            border-radius: 50%;
            display: inline-block;
            transition: all 0.3s ease;
        }
        
        .feature-card:hover .feature-icon {
            transform: scale(1.1);
            background: rgba(52, 152, 219, 0.2);
        }
        
        .feature-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--secondary);
        }
        
        .feature-desc {
            color: var(--text-light);
            line-height: 1.6;
        }
        
        /* 动态背景元素 */
        .floating-elements {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
        }
        
        .floating-element {
            position: absolute;
            border-radius: 50%;
            background: rgba(52, 152, 219, 0.1);
            animation: float 15s infinite linear;
        }
        
        .floating-element:nth-child(1) {
            width: 80px;
            height: 80px;
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }
        
        .floating-element:nth-child(2) {
            width: 120px;
            height: 120px;
            top: 60%;
            left: 80%;
            animation-delay: -5s;
        }
        
        .floating-element:nth-child(3) {
            width: 60px;
            height: 60px;
            top: 80%;
            left: 20%;
            animation-delay: -10s;
        }
        
        .floating-element:nth-child(4) {
            width: 100px;
            height: 100px;
            top: 30%;
            left: 70%;
            animation-delay: -7s;
        }
        
        /* 动画 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes float {
            0% {
                transform: translateY(0) rotate(0deg);
            }
            50% {
                transform: translateY(-20px) rotate(180deg);
            }
            100% {
                transform: translateY(0) rotate(360deg);
            }
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .navbar {
                flex-direction: column;
                gap: 15px;
            }
            
            h1 {
                font-size: 2.5rem;
            }
            
            .tagline {
                font-size: 1.2rem;
            }
            
            .description {
                font-size: 1rem;
            }
            
            .download-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                width: 250px;
            }
            
            .features {
                grid-template-columns: 1fr;
            }
        }
        
        /* 页脚 */
        footer {
            text-align: center;
            padding: 30px 0;
            margin-top: 50px;
            border-top: 1px solid rgba(0, 0, 0, 0.05);
            color: var(--text-light);
            background: white;
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin: 20px 0;
        }
        
        .footer-links a {
            color: var(--text-light);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: var(--primary);
        }
        
        /* 平台适配提示 */
        .platform-hint {
            background: white;
            border-radius: 10px;
            padding: 15px;
            margin: 20px auto;
            max-width: 500px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            animation: fadeInUp 1s ease 0.8s both;
        }
        
        .platform-hint i {
            color: var(--accent);
            font-size: 1.2rem;
        }