/* ==================== 管理后台样式 ==================== */
:root {
    --admin-primary: #3498db;
    --admin-primary-hover: #2980b9;
    --admin-secondary: #6c757d;
    --admin-success: #28a745;
    --admin-warning: #ffc107;
    --admin-danger: #dc3545;
    --admin-text: #333;
    --admin-text-light: #666;
    --admin-border: #e0e0e0;
    --admin-bg: #f5f5f5;
    --admin-card-bg: #fff;
    --admin-sidebar: #2c3e50;
    --admin-sidebar-hover: #34495e;
    --admin-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

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

/* ==================== 布局 ==================== */
.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: 250px;
    background: var(--admin-sidebar);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

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

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

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

.nav-item {
    display: block;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s;
}

.nav-item:hover {
    background: var(--admin-sidebar-hover);
    color: #fff;
    text-decoration: none;
}

.nav-item.active {
    background: var(--admin-primary);
    color: #fff;
}

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

.sidebar-footer a {
    display: block;
    padding: 10px 0;
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s;
}

.sidebar-footer a:hover {
    color: #fff;
}

/* ==================== 主内容区 ==================== */
.main-content {
    flex: 1;
    margin-left: 250px;
    background: var(--admin-bg);
}

.content-header {
    background: var(--admin-card-bg);
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--admin-shadow);
}

.content-header h1 {
    font-size: 1.5rem;
}

.user-info {
    color: var(--admin-text-light);
}

.content-body {
    padding: 30px;
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--admin-card-bg);
    border-radius: 8px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--admin-shadow);
}

.stat-icon {
    font-size: 2.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
}

.stat-label {
    color: var(--admin-text-light);
}

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.filter-group {
    display: flex;
    gap: 10px;
}

/* ==================== 表格 ==================== */
.data-table {
    width: 100%;
    background: var(--admin-card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--admin-shadow);
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--admin-border);
}

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

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

.data-table a {
    color: var(--admin-primary);
}

.data-table a:hover {
    text-decoration: underline;
}

/* ==================== 表单 ==================== */
.form-card {
    background: var(--admin-card-bg);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--admin-shadow);
    max-width: 800px;
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    font-size: 1rem;
}

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

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

.flex-grow {
    flex: 1;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* ==================== 文章表单 ==================== */
.article-form {
    background: var(--admin-card-bg);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--admin-shadow);
}

.article-form textarea[name="content"] {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-input-wrapper input[type="text"] {
    width: 120px;
}

/* ==================== 按钮 ==================== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-primary {
    background: var(--admin-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--admin-primary-hover);
    color: #fff;
}

.btn-secondary {
    background: var(--admin-secondary);
    color: #fff;
}

.btn-secondary:hover {
    opacity: 0.9;
    color: #fff;
}

.btn-danger {
    background: var(--admin-danger);
    color: #fff;
}

.btn-danger:hover {
    opacity: 0.9;
    color: #fff;
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.85rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ==================== 徽章 ==================== */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
}

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

.badge-warning {
    background: var(--admin-warning);
    color: #333;
}

/* ==================== 操作按钮 ==================== */
.action-buttons {
    display: flex;
    gap: 5px;
}

/* ==================== 提示框 ==================== */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-success { background: #d4edda; color: #155724; }
.alert-danger { background: #f8d7da; color: #721c24; }
.alert-warning { background: #fff3cd; color: #856404; }
.alert-info { background: #d1ecf1; color: #0c5460; }

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--admin-card-bg);
    border-radius: 8px;
    box-shadow: var(--admin-shadow);
}

.empty-state p {
    color: var(--admin-text-light);
    margin-bottom: 20px;
}

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 25px;
}

.page-link {
    display: inline-block;
    padding: 8px 15px;
    background: var(--admin-card-bg);
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    color: var(--admin-text);
}

.page-link:hover {
    background: var(--admin-primary);
    color: #fff;
    border-color: var(--admin-primary);
    text-decoration: none;
}

.page-link.active {
    background: var(--admin-primary);
    color: #fff;
    border-color: var(--admin-primary);
}

/* ==================== 最近文章区 ==================== */
.recent-section {
    background: var(--admin-card-bg);
    border-radius: 8px;
    padding: 25px;
    box-shadow: var(--admin-shadow);
}

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

.section-header h2 {
    font-size: 1.2rem;
}

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

.login-card {
    background: #fff;
    border-radius: 10px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.login-card h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--admin-text);
}

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

.login-form input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    font-size: 1rem;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
}

/* ==================== 响应式 ==================== */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .main-content {
        margin-left: 200px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .toolbar {
        flex-direction: column;
        gap: 15px;
    }
    
    .form-row {
        flex-direction: column;
    }
}