* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #2c3e50, #34495e);
            color: white;
            padding: 60px 0;
            text-align: center;
        }
        header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
        }
        header p {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 800px;
            margin: 0 auto;
        }
        .section {
            padding: 80px 0;
            background-color: white;
            margin-bottom: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .section-title {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 40px;
            color: #2c3e50;
            position: relative;
        }
        .section-title::after {
            content: "";
            display: block;
            width: 80px;
            height: 4px;
            background-color: #3498db;
            margin: 15px auto;
            border-radius: 2px;
        }
        /* 核心优势：2行2列，每列50%宽度 */
        .features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 40px;
        }
        .feature-card {
            padding: 30px;
            border-radius: 8px;
            background-color: #f8f9fa;
            border: 1px solid #eee;
            transition: transform 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .feature-card h3 {
            color: #2c3e50;
            margin-bottom: 15px;
            font-size: 1.4rem;
        }
        .feature-card p {
            color: #666;
            font-size: 1rem;
        }
        /* 截图区域适配4张图，自动两列排版 */
        .screenshots {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 40px;
            margin-top: 40px;
        }
        .screenshot-card {
            text-align: center;
        }
        .screenshot-card img {
            width: 100%;
            border-radius: 8px;
            border: 1px solid #eee;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .screenshot-card img:hover {
            transform: scale(1.02);
            box-shadow: 0 5px 15px rgba(0,0,0,0.15);
        }
        .screenshot-card p {
            margin-top: 15px;
            font-size: 1.1rem;
            color: #444;
        }
        .download-btn {
            display: inline-block;
            margin-top: 10px;
            padding: 8px 15px;
            background-color: #3498db;
            color: white;
            text-decoration: none;
            border-radius: 4px;
            font-size: 0.9rem;
            transition: background-color 0.3s ease;
        }
        .download-btn:hover {
            background-color: #2980b9;
        }
        .cta-button {
            background-color: var(--primary);
            color: white;
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
        }
        .advantage {
            background-color: #f8f9fa;
            padding: 60px 0;
            margin-top: 40px;
            border-radius: 8px;
        }
        .advantage ul {
            max-width: 800px;
            margin: 0 auto;
            list-style: none;
        }
        .advantage li {
            padding: 15px 0;
            border-bottom: 1px solid #eee;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
        }
        .advantage li::before {
            content: "✓";
            color: #27ae60;
            font-size: 1.5rem;
            margin-right: 15px;
        }
        footer {
            background-color: #2c3e50;
            color: white;
            text-align: center;
            padding: 30px 0;
            margin-top: 40px;
        }
        footer p {
            opacity: 0.8;
        }
        /* 移动端适配 */
        @media (max-width: 768px) {
            header h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .features {
                grid-template-columns: 1fr;
            }
            .screenshots {
                grid-template-columns: 1fr;
            }
        }