/* 基础样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    background-color: #f5f5f5;
}

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

.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin: 10px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #0056b3;
}

.navbar {
    background-color: #333;
    overflow: hidden;
}

.navbar a {
    float: left;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.navbar a:hover {
    background-color: #ddd;
    color: black;
}