/* 全局样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: #333;
}

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

.header {
    background-color: #007bff;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header h1 {
    margin: 0;
    font-size: 2rem;
}

.navbar {
    background-color: #343a40;
    padding: 0.5rem 0;
}

.navbar a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    display: inline-block;
}

.navbar a:hover {
    background-color: #495057;
}

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

.footer {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .content {
        padding: 1rem;
        margin: 1rem 0;
    }
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.btn-secondary {
    background-color: #6c757d;
}

.btn-secondary:hover {
    background-color: #545b62;
}

/* 卡片样式 */
.card {
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1rem 0;
    background: white;
}

.card h3 {
    margin-top: 0;
    color: #007bff;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.table th,
.table td {
    padding: 0.75rem;
    border: 1px solid #dee2e6;
    text-align: left;
}

.table th {
    background-color: #f8f9fa;
    font-weight: bold;
}

.table tr:nth-child(even) {
    background-color: #f8f9fa;
}