* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f6f9;
    color: #333;
}

.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
    width: 250px;
    background-color: #2c3e50;
    color: #fff;
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar .logo {
    text-align: center;
    margin-bottom: 30px;
    padding: 0 20px;
}

.sidebar .logo h1 {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
}

.sidebar .nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar .nav li {
    margin-bottom: 5px;
}

.sidebar .nav a {
    display: block;
    padding: 12px 20px;
    color: #ecf0f1;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 14px;
}

.sidebar .nav a:hover {
    background-color: #34495e;
    padding-left: 25px;
}

.sidebar .nav a.active {
    background-color: #3498db;
    border-left: 4px solid #2980b9;
    padding-left: 25px;
}

.sidebar .nav a.logout-link {
    background-color: #e74c3c;
    margin-top: 20px;
    border-radius: 4px;
    text-align: center;
    font-weight: 600;
}

.sidebar .nav a.logout-link:hover {
    background-color: #c0392b;
    padding-left: 20px;
}

/* 主内容区样式 */
.main-content {
    margin-left: 250px;
    flex: 1;
    padding: 20px;
}

/* 头部样式 */
.header {
    background-color: #fff;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 20px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header h2 {
    font-size: 20px;
    font-weight: 600;
    color: #2c3e50;
}

/* 卡片样式 */
.card {
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.card-header {
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
}

/* 表单样式 */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="number"]:focus,
.form-group textarea:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: #3498db;
    color: #fff;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #95a5a6;
    color: #fff;
    margin-left: 10px;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

/* 响应式样式 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
    }
}