/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* 顶部导航栏 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1920px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
}

.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background 0.3s;
}

.nav-link:hover {
    background: rgba(255,255,255,0.2);
}

.user-info {
    margin-left: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logout-btn {
    color: white;
    text-decoration: none;
    padding: 6px 12px;
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
    font-size: 14px;
}

.logout-btn:hover {
    background: rgba(255,255,255,0.3);
}

/* 主容器 */
.main-container {
    display: flex;
    max-width: 1920px;
    margin: 0 auto;
    min-height: calc(100vh - 120px);
}

/* 左侧菜单栏 */
.sidebar {
    width: 220px;
    background: white;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    padding: 20px 0;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.sidebar-item:hover {
    background: #f8f9fa;
    border-left-color: #667eea;
}

.sidebar-item .icon {
    margin-right: 12px;
    font-size: 18px;
}

/* 主内容区域 */
.content {
    flex: 1;
    padding: 30px;
    background: white;
    margin: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    min-height: 600px;
}

/* 右侧工具栏 */
.toolbar {
    width: 300px;
    background: white;
    box-shadow: -2px 0 10px rgba(0,0,0,0.05);
    padding: 20px;
}

/* 底部状态栏 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 15px 20px;
    text-align: center;
    margin-top: 20px;
}

.footer-container {
    max-width: 1920px;
    margin: 0 auto;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

/* 提示信息 */
.alert {
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.card-header {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
}

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

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

.table tr:hover {
    background: #f8f9fa;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.stat-card h3 {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-card .change {
    font-size: 12px;
    opacity: 0.8;
}

/* 响应式 */
@media (max-width: 1400px) {
    .toolbar {
        width: 250px;
    }
}

@media (max-width: 1200px) {
    .sidebar {
        width: 180px;
    }
    .toolbar {
        display: none;
    }
}