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

:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --info-color: #3B82F6;
    --bg-color: #F9FAFB;
    --sidebar-bg: #1F2937;
    --sidebar-hover: #374151;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --white: #FFFFFF;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* 登录页面 */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.login-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 主界面布局 */
.main-page {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--white);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    will-change: transform;
    transform: translateZ(0);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 24px;
    font-weight: 700;
}

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

.menu-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
    position: relative;
    cursor: pointer;
    user-select: none;
}

.menu-item:hover {
    background: var(--sidebar-hover);
    color: var(--white);
}

.menu-item.active {
    background: var(--primary-color);
    color: var(--white);
}

.menu-item .icon {
    font-size: 20px;
    margin-right: 12px;
}

.menu-item .badge {
    position: absolute;
    right: 20px;
    background: var(--danger-color);
    color: var(--white);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    will-change: transform;
}

/* 顶部栏 */
.top-bar {
    height: 64px;
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    contain: layout style;
}

.top-bar-left h3 {
    font-size: 20px;
    font-weight: 600;
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-info img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 4px;
    border: 2px solid #cbd5e1;
    transition: all 0.3s ease;
}

.admin-info img:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

/* 内容容器 */
.content-container {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    min-height: calc(100vh - 64px);
    height: calc(100vh - 64px);
    position: relative;
    contain: layout style paint;
}

/* 页面切换动画 */
#pageContent {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.2s ease-out, transform 0.2s ease-out;
    will-change: opacity, transform;
    position: relative;
    min-height: 100%;
}

#pageContent.loaded {
    opacity: 1;
    transform: translateY(0);
}

#pageContent.switching {
    opacity: 0;
    transform: translateY(-5px);
}

/* 骨架屏加载效果 */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.skeleton-line {
    height: 16px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-line.medium {
    width: 80%;
}

.skeleton-line.long {
    width: 100%;
}

/* 卡片 */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.stat-card-title {
    font-size: 14px;
    color: var(--text-secondary);
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-card-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
}

/* 按钮 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

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

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* 表格 */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table thead {
    background: var(--bg-color);
}

table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    text-transform: uppercase;
}

table td {
    padding: 16px 12px;
    border-bottom: 1px solid var(--border-color);
}

table tbody tr:hover {
    background: var(--bg-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* 搜索栏 */
.search-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 200px;
}

/* 分页 */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.pagination button {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background: var(--white);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination button:hover:not(:disabled) {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination .page-info {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #D1FAE5;
    color: var(--success-color);
}

.badge-danger {
    background: #FEE2E2;
    color: var(--danger-color);
}

.badge-warning {
    background: #FEF3C7;
    color: var(--warning-color);
}

.badge-info {
    background: #DBEAFE;
    color: var(--info-color);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Toast */
.toast {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--white);
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 10000;
    animation: slideIn 0.3s ease-out;
}

.toast.show {
    display: block;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 图片预览 */
.image-preview {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.image-preview-item {
    position: relative;
    width: 100px;
    height: 100px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-item .remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    background: var(--danger-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 聊天界面 */
.chat-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 24px;
    height: calc(100vh - 160px);
}

.chat-list {
    background: var(--white);
    border-radius: 12px;
    overflow-y: auto;
}

.chat-item {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.3s;
}

.chat-item:hover {
    background: var(--bg-color);
}

.chat-item.active {
    background: var(--primary-color);
    color: var(--white);
}

.chat-window {
    background: var(--white);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.chat-message {
    margin-bottom: 16px;
    display: flex;
    gap: 12px;
}

.chat-message.admin {
    flex-direction: row-reverse;
}

.chat-message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.chat-message-content {
    max-width: 60%;
    padding: 12px;
    border-radius: 12px;
    background: var(--bg-color);
}

.chat-message.admin .chat-message-content {
    background: var(--primary-color);
    color: var(--white);
}

.chat-input {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
}

.chat-input input {
    flex: 1;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .main-content {
        margin-left: 200px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-container {
        grid-template-columns: 1fr;
    }
}