/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}

/* 页面背景 */
body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* 主容器 */
.main-container {
    width: 100%;
    max-width: 600px;
}

/* 升级卡片样式 */
.upgrade-card {
    background: white;
    padding: 60px 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
}

/* 图标样式 */
.icon {
    font-size: 80px;
    margin-bottom: 30px;
    color: #4263eb;
}

/* 标题样式 */
h1 {
    font-size: 32px;
    color: #2d3748;
    margin-bottom: 20px;
}

/* 描述文本 */
.desc {
    font-size: 18px;
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 40px;
}

/* 联系方式区域 */
.contact {
    margin-bottom: 30px;
    text-align: left;
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
}

.contact p {
    font-size: 16px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
}

.contact ul {
    list-style: none;
}

.contact li {
    font-size: 16px;
    color: #4263eb;
    margin: 8px 0;
}

/* 版权信息 */
.copyright {
    font-size: 14px;
    color: #718096;
    margin-top: 20px;
}

/* 响应式适配手机 */
@media (max-width: 768px) {
    .upgrade-card {
        padding: 40px 20px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .desc {
        font-size: 16px;
    }
}