/* ============================================
   爱莱客AI工具箱 v2.0 - 基础样式
   CSS变量、重置、布局、排版
   ============================================ */

:root {
  --color-primary: #5B6EF5;
  --color-primary-hover: #4A5DE0;
  --color-primary-light: #EEF0FF;
  --color-primary-dark: #3D4FC0;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #3B82F6;

  --color-surface: #F9FAFB;
  --color-surface-raised: #FFFFFF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  --color-text-primary: #111827;
  --color-text-secondary: #4B5563;
  --color-text-muted: #9CA3AF;
  --color-text-inverse: #FFFFFF;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

/* ==========================================
   布局
   ========================================== */
#app {
  min-height: 100vh;
}

.app-layout {
  display: flex;
  min-height: 100vh;
}

.content-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

.content-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-2xl);
  flex: 1;
  min-width: 0;
}

.content-inner.narrow {
  max-width: 800px;
}

.page-header {
  margin-bottom: var(--space-xl);
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.page-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.mt-2xs { margin-top: var(--space-xs); }

/* ==========================================
   侧边栏
   ========================================== */
.sidebar {
  width: 240px;
  background: var(--color-surface-raised);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-logo {
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-logo-text {
  font-size: 0.875rem;
  font-weight: 700;
}
.sidebar-logo-text span {
  display: block;
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-sm);
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 2px;
}

.sidebar-nav-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.sidebar-nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.sidebar-nav-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sidebar-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-info));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

.sidebar-user-info { flex: 1; min-width: 0; }
.sidebar-user-name { font-size: 0.8125rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user-plan { font-size: 0.6875rem; color: var(--color-text-muted); }

.sidebar-logout {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
}
.sidebar-logout:hover { color: var(--color-danger); background: #FEF2F2; }
.sidebar-logout svg { width: 16px; height: 16px; }

/* 移动端 */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 100;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
}
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 40;
}

@media (max-width: 768px) {
  .sidebar-toggle { display: block; }
  .sidebar { position: fixed; left: -280px; top: 0; bottom: 0; z-index: 50; transition: left var(--transition); }
  .sidebar.open { left: 0; }
  .sidebar-overlay.show { display: block; }
  .content-inner { padding: var(--space-lg) var(--space-md); }
}

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

.admin-sidebar {
  width: 200px;
  background: var(--color-text-primary);
  color: var(--color-text-inverse);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.admin-sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  font-weight: 700;
  font-size: 0.9375rem;
}

.admin-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px var(--space-lg);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  cursor: pointer;
  transition: all var(--transition);
}

.admin-nav-item:hover { background: rgba(255,255,255,0.08); color: white; }
.admin-nav-item.active { background: var(--color-primary); color: white; }

.admin-content {
  flex: 1;
  background: var(--color-surface);
  overflow-y: auto;
  padding: var(--space-xl) var(--space-2xl);
}

/* 管理员页面header */
.admin-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}
.admin-page-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
}

/* 管理后台 Tab 切换 */
.admin-tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-lg);
}
.admin-tab-btn {
  background: none;
  border: none;
  padding: 10px 16px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  cursor: pointer;
  position: relative;
  transition: all var(--transition);
  font-weight: 500;
}
.admin-tab-btn:hover { color: var(--color-text-primary); }
.admin-tab-btn.active {
  color: var(--color-primary);
  font-weight: 600;
}
.admin-tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

/* 管理后台统计卡片网格 */
.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.admin-stat-card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: box-shadow var(--transition);
}
.admin-stat-card:hover { box-shadow: var(--shadow-md); }
.admin-stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 4px;
}
.admin-stat-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}
.admin-stat-card small {
  display: block;
  font-size: 0.7rem;
  margin-top: 4px;
}

@media (max-width: 768px) {
  .admin-stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .admin-stats-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   Switch 开关
   ========================================== */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--color-border);
  border-radius: 24px;
  transition: 0.25s;
}
.switch .slider::before {
  content: '';
  position: absolute;
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: 0.25s;
}
.switch input:checked + .slider {
  background: var(--color-primary);
}
.switch input:checked + .slider::before {
  transform: translateX(20px);
}

/* ==========================================
   响应式
   ========================================== */
@media (max-width: 1024px) {
  .sidebar { width: 200px; }
}

@media (max-width: 768px) {
  .admin-sidebar { display: none; }
  .app-layout { flex-direction: column; }
}