/**
 * ============================================
 * 订单管理系统 - 电商后台设计系统
 * ============================================
 * 设计风格：Data-Dense Dashboard
 * 主色调：专业蓝色系 (#1E40AF, #3B82F6)
 * 强调色：琥珀色 (#F59E0B)
 * 字体：Fira Sans (正文) + Fira Code (数据) - 本地字体
 * ============================================
 */

/* ==================== CSS变量定义 ==================== */
:root {
    /* 主色调 - 蓝色系 */
    --primary-50: #EFF6FF;
    --primary-100: #DBEAFE;
    --primary-200: #BFDBFE;
    --primary-300: #93C5FD;
    --primary-400: #60A5FA;
    --primary-500: #3B82F6;
    --primary-600: #2563EB;
    --primary-700: #1D4ED8;
    --primary-800: #1E40AF;
    --primary-900: #1E3A8A;

    /* 强调色 - 琥珀色 */
    --accent-50: #FFFBEB;
    --accent-100: #FEF3C7;
    --accent-200: #FDE68A;
    --accent-300: #FCD34D;
    --accent-400: #FBBF24;
    --accent-500: #F59E0B;
    --accent-600: #D97706;
    --accent-700: #B45309;
    --accent-800: #92400E;
    --accent-900: #78350F;

    /* 状态色 */
    --success-50: #F0FDF4;
    --success-500: #22C55E;
    --success-600: #16A34A;
    --success-700: #15803D;

    --warning-50: #FEF3C7;
    --warning-500: #F59E0B;
    --warning-600: #D97706;

    --danger-50: #FEF2F2;
    --danger-400: #F87171;
    --danger-500: #EF4444;
    --danger-600: #DC2626;
    --danger-700: #B91C1C;

    --info-50: #F0F9FF;
    --info-500: #0EA5E9;
    --info-600: #0284C7;

    /* 中性色 */
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;

    /* 背景色 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --bg-surface: #FFFFFF;
    --bg-surface-alt: #F8FAFC;

    /* 文字色 */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #64748B;
    --text-muted: #94A3B8;
    --text-inverse: #FFFFFF;

    /* 边框色 */
    --border-light: #E2E8F0;
    --border-medium: #CBD5E1;
    --border-dark: #94A3B8;

    /* 阴影 */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* 间距 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* 动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 500ms ease;

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ==================== 全局重置与基础样式 ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Fira Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 0.9375rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

/* ==================== 排版 ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
    margin-bottom: var(--space-4);
}

/* 数据字体 */
.data-font {
    font-family: 'Fira Code', Consolas, Monaco, "Courier New", monospace;
    font-variant-numeric: tabular-nums;
}

/* ==================== 布局容器 ==================== */
.admin-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.admin-header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

.admin-main {
    flex: 1;
    padding: var(--space-6);
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

.admin-sidebar {
    width: 260px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-light);
    height: 100vh;
    position: sticky;
    top: 0;
    overflow-y: auto;
    padding: var(--space-4);
}

/* ==================== 卡片组件 ==================== */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.card-title::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--primary-600);
    border-radius: var(--radius-full);
}

.card-body {
    padding: 0;
}

.card-footer {
    padding-top: var(--space-5);
    margin-top: var(--space-5);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-5);
    margin-bottom: var(--space-6);
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.primary {
    background: var(--primary-50);
    color: var(--primary-600);
}

.stat-icon.success {
    background: var(--success-50);
    color: var(--success-600);
}

.stat-icon.warning {
    background: var(--warning-50);
    color: var(--warning-600);
}

.stat-icon.danger {
    background: var(--danger-50);
    color: var(--danger-600);
}

.stat-icon.accent {
    background: var(--accent-50);
    color: var(--accent-600);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-1);
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    font-family: 'Fira Code', Consolas, Monaco, "Courier New", monospace;
}

.stat-change {
    font-size: 0.75rem;
    font-weight: 500;
    margin-top: var(--space-1);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}

.stat-change.positive {
    color: var(--success-600);
}

.stat-change.negative {
    color: var(--danger-600);
}

.stat-change.neutral {
    color: var(--text-tertiary);
}

/* ==================== 按钮组件 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* 按钮尺寸 */
.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
}

/* 按钮变体 */
.btn-primary {
    background: var(--primary-600);
    color: var(--text-inverse);
    border-color: var(--primary-600);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-700);
    border-color: var(--primary-700);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.btn-success {
    background: var(--success-600);
    color: var(--text-inverse);
    border-color: var(--success-600);
}

.btn-success:hover:not(:disabled) {
    background: var(--success-700);
    border-color: var(--success-700);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn-warning {
    background: var(--warning-500);
    color: var(--text-inverse);
    border-color: var(--warning-500);
}

.btn-warning:hover:not(:disabled) {
    background: var(--warning-600);
    border-color: var(--warning-600);
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

.btn-danger {
    background: var(--danger-500);
    color: var(--text-inverse);
    border-color: var(--danger-500);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-600);
    border-color: var(--danger-600);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--text-primary);
}

.btn-link {
    background: transparent;
    color: var(--primary-600);
    border-color: transparent;
    padding: 0;
    box-shadow: none;
}

.btn-link:hover:not(:disabled) {
    color: var(--primary-700);
    text-decoration: underline;
    box-shadow: none;
}

/* 按钮组 */
.btn-group {
    display: flex;
    gap: var(--space-3);
}

.btn-group.vertical {
    flex-direction: column;
}

/* ==================== 表单组件 ==================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-label.required::after {
    content: '*';
    color: var(--danger-500);
    margin-left: var(--space-1);
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin-top: var(--space-2);
}

.form-error {
    font-size: 0.8125rem;
    color: var(--danger-600);
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 0.9375rem;
    font-family: inherit;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--primary-400);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background: var(--gray-100);
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--danger-500);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

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

.form-checkbox,
.form-radio {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.form-checkbox input,
.form-radio input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-600);
    cursor: pointer;
}

/* 筛选表单容器 */
.filter-form-container {
    margin-bottom: var(--space-5);
    padding: var(--space-5);
    background: var(--bg-surface-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

/* 筛选表单布局 */
.filter-form {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.filter-form .form-group {
    margin-bottom: 0;
    min-width: 180px;
    flex: 1;
}

.action-buttons {
    display: flex;
    gap: var(--space-3);
    align-items: flex-end;
    margin-left: auto;
}

/* ==================== 表格组件 ==================== */
.table-container {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table thead {
    background: var(--gray-50);
    border-bottom: 2px solid var(--border-light);
}

.table th {
    padding: var(--space-4);
    text-align: left;
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.table th.sortable {
    cursor: pointer;
    user-select: none;
}

.table th.sortable:hover {
    background: var(--gray-100);
}

.table td {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background: var(--primary-50);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* 表格状态徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: var(--success-50);
    color: var(--success-600);
}

.badge-warning {
    background: var(--warning-50);
    color: var(--warning-600);
}

.badge-danger {
    background: var(--danger-50);
    color: var(--danger-600);
}

.badge-info {
    background: var(--info-50);
    color: var(--info-600);
}

.badge-primary {
    background: var(--primary-50);
    color: var(--primary-600);
}

.badge-neutral {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* ==================== 标签页导航 ==================== */
.tabs {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-2);
    background: var(--bg-surface-alt);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    overflow-x: auto;
}

.tab {
    padding: var(--space-3) var(--space-5);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.5);
}

.tab.active {
    background: var(--bg-surface);
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn var(--transition-normal);
}

/* ==================== 现代化标签页导航 (Element UI 风格) ==================== */
.modern-tab-navigation {
    position: relative;
    display: flex;
    gap: 32px;
    padding: 0 4px;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 24px;
    overflow-x: auto;
    scrollbar-width: none;
}

.modern-tab-navigation::-webkit-scrollbar {
    display: none;
}

/* 底部活动指示器 */
.modern-tab-navigation::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    height: 2px;
    background: var(--primary-600);
    transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    z-index: 1;
}

.modern-tab-btn {
    position: relative;
    padding: 12px 16px;
    font-family: 'Fira Sans', sans-serif;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modern-tab-btn .tab-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.modern-tab-btn:hover {
    color: var(--primary-600);
}

.modern-tab-btn.active {
    color: var(--primary-600);
}

.modern-tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-600);
    transition: transform 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

/* 标签页内容动画 */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: tabFadeIn 0.3s ease;
}

@keyframes tabFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .modern-tab-navigation {
        gap: 24px;
    }

    .modern-tab-btn {
        padding: 10px 12px;
        font-size: 0.875rem;
        gap: 6px;
    }

    .modern-tab-btn .tab-icon {
        width: 16px;
        height: 16px;
    }

    .modern-tab-btn .tab-text {
        font-size: 0.8125rem;
    }
}

/* ==================== 侧栏导航 (Element UI 风格) ==================== */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 240px;
    background: #001529;
    transition: width var(--transition-normal);
    z-index: var(--z-fixed);
    display: flex;
    flex-direction: column;
}

.admin-sidebar.collapsed {
    width: 64px;
}

.admin-sidebar-header {
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 var(--space-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
    position: relative;
}

.admin-sidebar.collapsed .admin-sidebar-header {
    padding: 0;
    justify-content: center;
}

/* 折叠状态下的展开按钮（在侧栏头部） - 已禁用，使用底部按钮 */
.sidebar-expand-btn {
    display: none !important;
}

.admin-logo {
    font-size: 1.125rem;
    font-weight: 600;
    color: #FFFFFF;
    white-space: nowrap;
    overflow: hidden;
    flex: 1;
}

.admin-sidebar.collapsed .admin-logo {
    display: none;
}

.admin-logo-icon {
    min-width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 侧栏菜单 */
.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-4) 0;
}

.sidebar-menu::-webkit-scrollbar {
    width: 6px;
}

.sidebar-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.sidebar-menu::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 菜单项 */
.sidebar-menu-item {
    position: relative;
}

.sidebar-menu-link {
    display: flex;
    align-items: center;
    padding: 12px var(--space-4);
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.sidebar-menu-link:hover {
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.08);
}

.sidebar-menu-item.active > .sidebar-menu-link {
    color: #FFFFFF;
    background: var(--primary-600);
}

/* 折叠状态下的菜单链接 */
.admin-sidebar.collapsed .sidebar-menu-link {
    padding: 12px;
    justify-content: center;
}

.sidebar-menu-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-right: var(--space-3);
}

.admin-sidebar.collapsed .sidebar-menu-icon {
    margin-right: 0;
}

.sidebar-menu-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition-fast);
}

.admin-sidebar.collapsed .sidebar-menu-text {
    opacity: 0;
    width: 0;
}

.sidebar-menu-arrow {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.sidebar-menu-item.expanded > .sidebar-menu-link .sidebar-menu-arrow {
    transform: rotate(90deg);
}

.admin-sidebar.collapsed .sidebar-menu-arrow {
    display: none;
}

/* 子菜单 */
.sidebar-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    background: rgba(0, 0, 0, 0.2);
}

.sidebar-menu-item.expanded > .sidebar-submenu {
    max-height: 500px;
}

.admin-sidebar.collapsed .sidebar-submenu {
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 180px;
    max-height: none;
    background: #001529;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.admin-sidebar.collapsed .sidebar-menu-item:hover > .sidebar-submenu {
    opacity: 1;
    visibility: visible;
}

.sidebar-submenu-item {
    position: relative;
}

.sidebar-submenu-link {
    display: flex;
    align-items: center;
    padding: 10px var(--space-4) 10px calc(var(--space-4) + 28px);
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.admin-sidebar.collapsed .sidebar-submenu-link {
    padding-left: var(--space-4);
}

.sidebar-submenu-link:hover {
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.08);
}

.sidebar-submenu-item.active > .sidebar-submenu-link {
    color: #FFFFFF;
    background: var(--primary-600);
}

/* 侧栏底部 */
.admin-sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-sidebar.collapsed .admin-sidebar-footer {
    padding: var(--space-2);
}

.collapse-btn {
    width: 100%;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.65);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.collapse-btn:hover {
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.1);
}

.admin-sidebar.collapsed .collapse-btn {
    height: 48px;
    background: rgba(37, 99, 235, 0.15);
    border: 1px solid rgba(37, 99, 235, 0.4);
    color: var(--primary-400);
}

.admin-sidebar.collapsed .collapse-btn:hover {
    background: rgba(37, 99, 235, 0.25);
    color: #FFFFFF;
}

.collapse-btn svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-normal);
}

.admin-sidebar.collapsed .collapse-btn svg {
    transform: rotate(180deg);
}

/* 主内容区域 */
.admin-main {
    flex: 1;
    margin-left: 240px;
    transition: margin-left var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.admin-sidebar.collapsed + .admin-main {
    margin-left: 64px;
}

.admin-header {
    height: 60px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.admin-header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.admin-header-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.admin-header-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.user-dropdown {
    position: relative;
}

.user-dropdown-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-dropdown-trigger:hover {
    background: var(--bg-secondary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 0.875rem;
    font-weight: 600;
}

.user-name {
    font-size: 0.875rem;
    color: var(--text-primary);
}

.admin-content {
    flex: 1;
    padding: var(--space-4);
    background: var(--bg-secondary);
    min-height: calc(100vh - 60px);
}

/* .admin-main 内部的 .admin-header 特殊样式 */
.admin-main > .admin-header {
    background: #ffffff;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    padding: 12px 20px;
    margin-left: 16px;
    margin-right: 16px;
    margin-bottom: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    height: auto;
    position: static;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.admin-header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-header-title {
    font-size: 18px;
    font-weight: 600;
    color: #1E293B;
    margin: 0;
}

.header-subtitle {
    font-size: 12px;
    color: #64748B;
    display: none;
}

.header-subtitle:not(:empty) {
    display: block;
}

.admin-header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 用户下拉菜单 - 现代风格 */
.user-dropdown {
    position: relative;
}

.user-dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s;
}

.user-dropdown-trigger:hover {
    background: #F8FAFC;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #3B82F6 0%, #1D4ED8 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 600;
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: #1E293B;
}

.user-role {
    font-size: 11px;
    color: #64748B;
}

.dropdown-arrow {
    width: 16px;
    height: 16px;
    color: #94A3B8;
    transition: transform 0.2s;
}

.user-dropdown-trigger:hover .dropdown-arrow {
    color: #64748B;
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    border: 1px solid #E2E8F0;
    overflow: hidden;
    z-index: 1000;
}

.dropdown-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: #F8FAFC;
}

.dropdown-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3B82F6 0%, #1D4ED8 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 16px;
    font-weight: 600;
}

.dropdown-user-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dropdown-username {
    font-size: 14px;
    font-weight: 600;
    color: #1E293B;
}

.dropdown-email {
    font-size: 12px;
    color: #64748B;
}

.dropdown-divider {
    height: 1px;
    background: #E2E8F0;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    font-size: 14px;
    color: #475569;
    transition: background 0.2s, color 0.2s;
}

.user-dropdown-item:hover {
    background: #FEF2F2;
    color: #DC2626;
}

.user-dropdown-item svg {
    width: 18px;
    height: 18px;
}

.user-dropdown-item:hover svg {
    stroke: #DC2626;
}

/* 用户下拉菜单 */
.user-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-2);
    min-width: 140px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
    z-index: var(--z-dropdown);
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: background var(--transition-fast);
}

.user-dropdown-item:hover {
    background: var(--bg-secondary);
}

.user-dropdown-item svg {
    flex-shrink: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }

    .admin-sidebar.mobile-open {
        transform: translateX(0);
        width: 240px;
    }

    .admin-main {
        margin-left: 0;
    }

    .admin-sidebar.collapsed + .admin-main {
        margin-left: 0;
    }

    .mobile-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: var(--z-modal-backdrop);
    }

    .mobile-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu-btn {
        display: flex;
        width: 36px;
        height: 36px;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        cursor: pointer;
        border-radius: var(--radius-md);
        color: var(--text-secondary);
    }

    .mobile-menu-btn:hover {
        background: var(--bg-secondary);
    }
}

@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none;
    }

    .mobile-overlay {
        display: none;
    }
}

/* ==================== 模态框 ==================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

/* ==================== 模态框 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    max-width: min(90vw, 600px);
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-6);
    border-top: 1px solid var(--border-light);
}

/* ==================== 通知/Toast ==================== */
.notification-container {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-tooltip);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-width: 380px;
}

.notification {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: slideInRight var(--transition-normal);
    max-width: 100%;
}

.notification.success,
.notification.error,
.notification.warning,
.notification.info {
    border-left: 4px solid;
}

.notification.removing {
    animation: slideOutRight var(--transition-normal);
}

.notification.success {
    border-left-color: var(--success-500);
}

.notification.error {
    border-left-color: var(--danger-500);
}

.notification.warning {
    border-left-color: var(--warning-500);
}

.notification.info {
    border-left-color: var(--info-500);
}

.notification-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.notification.success .notification-icon {
    color: var(--success-500);
}

.notification.error .notification-icon {
    color: var(--danger-500);
}

.notification.warning .notification-icon {
    color: var(--warning-500);
}

.notification.info .notification-icon {
    color: var(--info-500);
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.notification-message {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.notification-close {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.notification-close:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

/* ==================== 进度条 ==================== */
.progress {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-600);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-bar.success {
    background: var(--success-500);
}

.progress-bar.warning {
    background: var(--warning-500);
}

.progress-bar.danger {
    background: var(--danger-500);
}

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-5) 0;
}

.pagination-btn {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 36px;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--primary-50);
    border-color: var(--primary-300);
    color: var(--primary-600);
}

.pagination-btn.active {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: var(--text-inverse);
}

.pagination-btn:disabled {
    background: var(--gray-100);
    border-color: var(--border-light);
    color: var(--text-muted);
    cursor: not-allowed;
}

.pagination-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0 var(--space-4);
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    :root {
        --space-6: 16px;
    }

    .admin-main {
        padding: var(--space-4);
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .filter-form {
        flex-direction: column;
    }

    .filter-form .form-group {
        min-width: 100%;
    }

    .notification-container {
        left: var(--space-4);
        right: var(--space-4);
        max-width: none;
    }

    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .modal {
        max-width: calc(100vw - var(--space-6));
        max-height: calc(100vh - var(--space-6));
    }
}

/* ==================== 工具类 ==================== */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success-600); }
.text-warning { color: var(--warning-600); }
.text-danger { color: var(--danger-600); }
.text-info { color: var(--info-600); }

.font-mono { font-family: 'Fira Code', Consolas, Monaco, "Courier New", monospace; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

.hidden { display: none; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}