/* /admin/admin.css - 后台管理通用样式 */
:root {
    --sidebar-width: 260px;
    --header-height: 70px;
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-bg: #f8f9fa;
    --border-color: #e1e5e9;
    --shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* 后台布局 */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.admin-sidebar {
    width: var(--sidebar-width);
    background: var(--secondary-color);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform 0.3s;
    z-index: 100;
}

.sidebar-header {
    padding: 25px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header img {
    width: 50px;
    height: 50px;
    border-radius: var(--radius);
    margin-bottom: 15px;
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.admin-menu {
    padding: 20px 0;
}

.menu-item {
    display: block;
    padding: 15px 25px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
    display: flex;
    align-items: center;
    gap: 12px;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-left-color: var(--primary-color);
}

.menu-item.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-left-color: var(--primary-color);
}

.menu-item i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.menu-label {
    flex: 1;
}

.menu-badge {
    background: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.8rem;
    min-width: 20px;
    text-align: center;
}

/* 主内容区 */
.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* 顶部导航 */
.admin-header {
    height: var(--header-height);
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 5px;
}

.header-search {
    position: relative;
}

.header-search input {
    padding: 10px 15px 10px 40px;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    width: 300px;
    font-size: 0.95rem;
    background: var(--light-bg);
}

.header-search i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 15px;
    border-radius: var(--radius);
    transition: background-color 0.3s;
    cursor: pointer;
}

.user-info:hover {
    background: var(--light-bg);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.user-role {
    font-size: 0.8rem;
    color: #666;
}

.logout-btn {
    background: var(--light-bg);
    border: none;
    padding: 10px 15px;
    border-radius: var(--radius);
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}

.logout-btn:hover {
    background: var(--danger-color);
    color: white;
}

/* 内容区域 */
.admin-content {
    padding: 30px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* 页面标题 */
.page-header {
    margin-bottom: 30px;
}

.page-title {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-subtitle {
    color: #666;
    font-size: 1rem;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.stat-card {
    background: white;
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary-color);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card.success {
    border-top-color: var(--success-color);
}

.stat-card.warning {
    border-top-color: var(--warning-color);
}

.stat-card.danger {
    border-top-color: var(--danger-color);
}

.stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(52, 152, 219, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.stat-card.success .stat-icon {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.stat-card.warning .stat-icon {
    background: rgba(243, 156, 18, 0.1);
    color: var(--warning-color);
}

.stat-card.danger .stat-icon {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
}

.stat-title {
    font-size: 0.95rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-change {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.change-up {
    color: var(--success-color);
}

.change-down {
    color: var(--danger-color);
}

/* 内容卡片 */
.content-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    overflow: hidden;
}

.card-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.card-body {
    padding: 25px;
}

.card-footer {
    padding: 15px 25px;
    border-top: 1px solid var(--border-color);
    background: var(--light-bg);
}

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

.data-table th {
    background: var(--light-bg);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--secondary-color);
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.data-table tr:hover {
    background: #f8fafc;
}

.table-actions {
    display: flex;
    gap: 5px;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #219955;
}

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-warning:hover {
    background: #d68910;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background: var(--light-bg);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 15px 30px;
    font-size: 1.1rem;
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--secondary-color);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-text {
    margin-top: 5px;
    font-size: 0.9rem;
    color: #666;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* 消息提示 */
.alert {
    padding: 15px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-left: 4px solid;
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border-left-color: var(--success-color);
    color: var(--success-color);
}

.alert-warning {
    background: rgba(243, 156, 18, 0.1);
    border-left-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-danger {
    background: rgba(231, 76, 60, 0.1);
    border-left-color: var(--danger-color);
    color: var(--danger-color);
}

.alert-info {
    background: rgba(52, 152, 219, 0.1);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }
    
    .admin-sidebar.active {
        transform: translateX(0);
    }
    
    .admin-main {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
}

@media (max-width: 768px) {
    .admin-content {
        padding: 20px;
    }
    
    .admin-header {
        padding: 0 20px;
    }
    
    .header-search input {
        width: 200px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-responsive {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 600px;
    }
}

@media (max-width: 480px) {
    .admin-header {
        padding: 0 15px;
    }
    
    .header-search {
        display: none;
    }
    
    .user-details {
        display: none;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .card-actions {
        width: 100%;
        justify-content: space-between;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(52, 152, 219, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 模态框 */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}