/* 基础样式重置 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
}

iframe {
    min-height: 500px;
    width: 100%;
    height: 100%;
    border: none;
}

.menu-container {
    display: flex;
    background: #333;
    padding: 10px;
    margin-bottom: 20px;
    border-radius: 5px;
}

.menu-item {
    color: white;
    padding: 8px 16px;
    margin-right: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
    border-radius: 3px;
}

.menu-item:hover {
    background-color: #555;
}

.content-area {
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    min-height: 800px;
}

.active {
    background-color: #4CAF50;
}