* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding-top: 20px;
}

.header h1 {
    font-size: 28px;
    color: #2c3e50;
    margin-bottom: 10px;
}

.header p {
    color: #7f8c8d;
    font-size: 16px;
}

.main-content {
    flex: 1;
}

.download-card {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 18px;
    flex-shrink: 0;
}

.card-icon i {
    font-size: 28px;
    color: white;
}

.blue {
    background-color: #3498db;
}

.green {
    background-color: #2ecc71;
}

.orange {
    background-color: #e67e22;
}

.card-info {
    flex: 1;
}

.card-info h3 {
    font-size: 18px;
    color: #2c3e50;
    margin-bottom: 5px;
}

.card-info p {
    color: #7f8c8d;
    font-size: 14px;
    margin-bottom: 5px;
    text-align: justify;
}

.file-size {
    color: #95a5a6;
    font-size: 13px;
}

.download-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #f1f2f6;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 10px;
    flex-shrink: 0;
}

.download-btn i {
    color: #3498db;
    font-size: 18px;
}

.footer {
    text-align: center;
    padding: 20px 0;
    color: #95a5a6;
    font-size: 14px;
    margin-top: 30px;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .download-card {
        padding: 16px;
        flex-direction: column;
        text-align: center;
    }
    
    .card-icon {
        width: 50px;
        height: 50px;
        margin-right: 0;
        margin-bottom: 12px;
    }
    
    .card-icon i {
        font-size: 24px;
    }
    
    .download-btn {
        margin-left: 0;
        margin-top: 12px;
    }
    
    .card-info p {
        text-align: left;
    }
}

/* 去掉下载卡片链接的下划线 */
a.download-card {
    text-decoration: none;
    color: inherit; /* 继承原有文字颜色，不会变成蓝色 */
}

a.download-card:hover {
    text-decoration: none; /* 鼠标悬停时也不显示下划线 */
}