/* ===== Admin Layout (DESIGN.md: 浅色主题 + 品牌色 #5B5FED) ===== */
.admin-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--color-bg-tertiary);
}

/* Admin Sidebar —— 浅色侧栏 */
.admin-sidebar {
  width: var(--admin-sidebar-width);
  min-width: var(--admin-sidebar-width);
  background: var(--color-sidebar-bg);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-slow), min-width var(--transition-slow);
  overflow: hidden;
  border-right: 1px solid var(--color-border);
  z-index: var(--z-sticky);
}

.admin-sidebar.collapsed {
  width: var(--sidebar-collapsed);
  min-width: var(--sidebar-collapsed);
}

.admin-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  min-height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.admin-logo {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
  line-height: 1;
  display: flex;
  align-items: center;
}
.admin-subtitle {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  line-height: 1;
  display: flex;
  align-items: center;
}

.admin-frontend-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-sm) var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}
.admin-frontend-link:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  color: var(--color-accent);
}

/* Admin Nav (侧栏分组 + 菜单项) */
.sidebar-nav {
  flex: 1;
  padding: var(--space-sm) var(--space-xs);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-group {
  display: flex;
  flex-direction: column;
}

.nav-group-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-group-header:hover {
  background: var(--color-sidebar-hover);
  color: var(--color-text-primary);
}
.nav-group-active > .nav-group-header {
  color: var(--color-text-primary);
  font-weight: 600;
}

.nav-group-chevron-wrap {
  display: inline-flex;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}
.nav-group-chevron {
  display: inline-flex;
  color: var(--color-text-tertiary);
  transition: transform var(--transition-fast);
}
.nav-group-chevron.chevron-expanded {
  transform: rotate(180deg);
}
.nav-group-title {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav-group-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 2px 0 6px;
  margin-left: var(--space-lg);
  border-left: 1px solid var(--color-border-light);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 9px var(--space-md);
  margin-left: var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.nav-item:hover {
  background: var(--color-sidebar-hover);
  color: var(--color-text-primary);
}
.nav-item.active,
.nav-item-active {
  background: var(--color-accent-light);
  color: var(--color-accent);
}
.nav-item.active .nav-item-icon,
.nav-item-active .nav-item-icon {
  color: var(--color-accent);
}

.nav-item-icon {
  display: inline-flex;
  flex-shrink: 0;
  color: var(--color-text-tertiary);
}
.nav-item-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Sidebar footer */
.admin-sidebar-footer {
  padding: var(--space-sm);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}
.admin-user-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
}
.admin-user-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: #FFFFFF;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}
.admin-user-detail {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.admin-user-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}
.admin-logout-btn {
  background: none;
  border: none;
  padding: 0;
  margin-top: 2px;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.admin-logout-btn:hover {
  color: var(--color-error);
}

/* Admin Main */
.admin-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-2xl);
  background: #FFFFFF;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.admin-topbar-left {
  display: flex;
  align-items: center;
}

.admin-welcome {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

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

.admin-user-tag {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.admin-topbar-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-primary);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-topbar-action:hover {
  background: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

/* Admin Content Area */
.admin-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2xl);
}

/* Admin Common Components */
.admin-page-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2xl);
}

.admin-card {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.admin-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.admin-card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

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

.admin-table th {
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

.admin-table td {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-light);
}

.admin-table tr:hover td {
  background: var(--color-bg-hover);
}

.admin-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  white-space: nowrap;
}

.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge-error { background: var(--color-error-light); color: var(--color-error); }
.badge-info { background: var(--color-info-light); color: var(--color-info); }
.badge-neutral { background: var(--color-bg-tertiary); color: var(--color-text-secondary); }

.admin-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.admin-btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}
.admin-btn-outline:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-hover);
}

.admin-btn-danger {
  background: transparent;
  border: 1px solid var(--color-error);
  color: var(--color-error);
}
.admin-btn-danger:hover {
  background: var(--color-error-light);
}

.admin-btn-sm {
  padding: 3px 10px;
  font-size: var(--text-xs);
}

/* Admin Stats */
.admin-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.admin-stat-card {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--space-xl);
}

.admin-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.admin-stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

/* Admin Form */
.admin-form-group {
  margin-bottom: var(--space-xl);
}

.admin-form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.admin-form-input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background: #FFFFFF;
  transition: border-color var(--transition-fast);
  outline: none;
}

.admin-form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.admin-form-input::placeholder {
  color: var(--color-text-disabled);
}

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

.admin-form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.admin-form-actions {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

/* Version info in sidebar */
.admin-version-info {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-text-disabled);
  text-align: center;
  white-space: nowrap;
  border-top: 1px solid var(--color-border-light);
}

@media (max-width: 768px) {
  .admin-content {
    padding: var(--space-lg);
  }
  .admin-form-row {
    grid-template-columns: 1fr;
  }
}


/* ===== 页面头部与提示组件（短信配置等页复用） ===== */
.admin-page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  gap: var(--space-lg);
}
.admin-page-subtitle {
  margin: 6px 0 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.admin-alert {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-lg);
  border: 1px solid transparent;
  line-height: 1.5;
}
.admin-alert-success {
  background: var(--color-success-light);
  border-color: var(--color-success);
  color: var(--color-success);
}
.admin-alert-error {
  background: var(--color-error-light);
  border-color: var(--color-error);
  color: var(--color-error);
}
.admin-alert-info {
  background: var(--color-info-light);
  border-color: var(--color-info);
  color: var(--color-info);
}

.admin-form-hint {
  margin-top: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  line-height: 1.6;
}
.admin-form-hint code {
  background: var(--color-bg-tertiary);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: var(--text-xs);
}

.admin-tips {
  margin: 0;
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.9;
}
.admin-tips li {
  margin-bottom: var(--space-xs);
}


/* ===== 顶部栏与面包屑 ===== */
.admin-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  margin: calc(-1 * var(--space-2xl)) calc(-1 * var(--space-2xl)) var(--space-2xl);
  padding: 0 var(--space-2xl);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.admin-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
}
.crumb-root { color: var(--color-text-tertiary); }
.crumb-sep { color: var(--color-text-disabled); }
.crumb-group { color: var(--color-text-secondary); }
.crumb-current { color: var(--color-text-primary); font-weight: 600; }
.admin-topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}
.admin-user-avatar.sm {
  width: 28px;
  height: 28px;
  font-size: var(--text-xs);
}
.admin-topbar-username { font-weight: 600; color: var(--color-text-primary); }