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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 侧边栏样式 */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
    color: white;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
}

.logo i {
    font-size: 24px;
    color: #3498db;
}

.sidebar-nav {
    padding: 20px 0;
    flex: 1;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin: 5px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 0 25px 25px 0;
    margin-right: 20px;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: white;
    transform: translateX(5px);
}

.nav-item.active .nav-link {
    background: linear-gradient(90deg, #3498db, #2980b9);
    color: white;
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.3);
}

.nav-link i {
    font-size: 18px;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
    font-size: 14px;
}

.user-role {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.logout-btn {
    width: 100%;
    background: rgba(231, 76, 60, 0.8);
    border: none;
    color: white;
    padding: 10px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: #e74c3c;
    transform: translateY(-2px);
}

/* 主内容区域 */
.main-content {
    margin-left: 280px;
    min-height: 100vh;
    background: #f8f9fa;
    transition: all 0.3s ease;
}

/* 顶部导航栏 */
.top-header {
    background: white;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 20px;
    color: #666;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.sidebar-toggle:hover {
    background: #f8f9fa;
    color: #333;
}

.page-title {
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    background: none;
    border: none;
    font-size: 18px;
    color: #666;
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    position: relative;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: #f8f9fa;
    color: #333;
}

.badge {
    position: absolute;
    top: 5px;
    right: 5px;
    background: #e74c3c;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* 内容区域 */
.content-wrapper {
    padding: 30px;
}

.content-page {
    display: none;
}

.content-page.active {
    display: block;
}

/* 统计卡片 */
.stat-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-card:nth-child(1) .stat-icon {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, #f093fb, #f5576c);
}

.stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
}

.stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
}

.stat-content {
    flex: 1;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: #666;
}

/* 内容卡片 */
.content-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    border: 1px solid rgba(0,0,0,0.05);
    overflow: hidden;
}

.card-header {
    padding: 25px 30px;
    border-bottom: 1px solid #eee;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
}

.card-header h5 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: #333;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h5 i {
    color: #3498db;
}

.card-subtitle {
    margin: 5px 0 0 0;
    font-size: 14px;
    color: #666;
}

.card-body {
    padding: 30px;
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-control:focus {
    outline: none;
    border-color: #3498db;
    background: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8f9fa;
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: #3498db;
    background: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-text {
    font-size: 12px;
    color: #666;
    margin-top: 5px;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(149, 165, 166, 0.4);
}

/* 图表占位符 */
.chart-placeholder {
    height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #666;
    background: #f8f9fa;
    border-radius: 8px;
    border: 2px dashed #ddd;
}

.chart-placeholder i {
    font-size: 48px;
    margin-bottom: 15px;
    color: #ccc;
}

/* 活动列表 */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.activity-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.activity-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
}

.activity-content {
    flex: 1;
}

.activity-text {
    font-weight: 600;
    color: #333;
    margin-bottom: 3px;
}

.activity-time {
    font-size: 12px;
    color: #666;
}

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

.table th {
    background: #f8f9fa;
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: #333;
    border-bottom: 2px solid #dee2e6;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid #dee2e6;
    color: #666;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stat-card {
        margin-bottom: 20px;
    }
    
    .content-wrapper {
        padding: 15px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-page.active {
    animation: fadeIn 0.5s ease;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}