/* 全局样式 */
* {
    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-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #88ddba 0%, #4CAF50 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.header h1 {
    font-size: 3em;
    margin-bottom: 20px;
}

.header .subtitle {
    font-size: 1.5em;
    opacity: 0.9;
}

/* 特色功能部分 */
.features {
    padding: 80px 0;
    background-color: white;
}

.features h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #333;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    border-radius: 10px;
    background: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-item img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
}

.feature-item h3 {
    margin-bottom: 15px;
    color: #333;
}

/* 使用步骤部分 */
.how-to-use {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.how-to-use h2 {
    text-align: center;
    margin-bottom: 50px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.step {
    text-align: center;
    padding: 30px;
    position: relative;
}

.step-number {
    width: 40px;
    height: 40px;
    background: #88ddba;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-weight: bold;
}

/* 下载部分 */
.download {
    padding: 80px 0;
    background-color: white;
    text-align: center;
}

.qr-code {
    margin-top: 40px;
}

.qr-code img {
    width: 200px;
    height: 200px;
    margin-bottom: 20px;
}

/* 页脚样式 */
.footer {
    background-color: #333;
    color: white;
    padding: 20px 0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        padding: 60px 0;
    }

    .header h1 {
        font-size: 2.5em;
    }

    .header .subtitle {
        font-size: 1.2em;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: 1fr;
    }
}