.admin-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg-secondary, #f5f6fa);
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 24px;
  background: var(--primary, #4a6cf7);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

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

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

.admin-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  background: rgba(255,255,255,0.2);
  color: #fff;
}

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

.admin-back-btn {
  padding: 6px 16px;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 6px;
  background: transparent;
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s;
}

.admin-back-btn:hover {
  background: rgba(255,255,255,0.15);
}

.admin-body {
  display: flex;
  flex: 1;
}

.admin-sidebar {
  width: 220px;
  background: #fff;
  border-right: 1px solid var(--border-color, #e8e8e8);
  padding: 16px 0;
  flex-shrink: 0;
}

.admin-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  color: var(--text-secondary, #666);
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.admin-nav-item:hover {
  background: var(--bg-secondary, #f5f6fa);
  color: var(--text-primary, #333);
}

.admin-nav-item.active {
  background: var(--bg-secondary, #f5f6fa);
  color: var(--primary, #4a6cf7);
  border-left-color: var(--primary, #4a6cf7);
  font-weight: 500;
}

.admin-nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.admin-content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

.admin-page-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary, #333);
  margin-bottom: 24px;
}

.admin-stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.admin-stat-card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.admin-stat-card-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.admin-stat-card-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary, #333);
}

.admin-stat-card-label {
  font-size: 13px;
  color: var(--text-secondary, #666);
  margin-top: 4px;
}

.admin-trend-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  margin-bottom: 24px;
}

.admin-trend-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary, #333);
  margin-bottom: 16px;
}

.admin-trend-chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 120px;
  padding-top: 8px;
}

.admin-trend-bar-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.admin-trend-bar {
  width: 100%;
  max-width: 40px;
  border-radius: 4px 4px 0 0;
  background: var(--primary, #4a6cf7);
  transition: height 0.3s ease;
  min-height: 2px;
}

.admin-trend-bar.secondary {
  background: var(--success, #52c41a);
}

.admin-trend-date {
  font-size: 11px;
  color: var(--text-secondary, #666);
}

.admin-trend-value {
  font-size: 11px;
  color: var(--text-primary, #333);
  font-weight: 500;
}

.admin-table-container {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  overflow: hidden;
}

.admin-table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color, #e8e8e8);
  gap: 12px;
  flex-wrap: wrap;
}

.admin-table-toolbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.admin-table-toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.admin-search-input {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  font-size: 13px;
  width: 220px;
  outline: none;
  transition: border-color 0.2s;
}

.admin-search-input:focus {
  border-color: var(--primary, #4a6cf7);
}

.admin-filter-select {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  background: #fff;
  cursor: pointer;
}

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

.admin-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary, #666);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-secondary, #fafafa);
  border-bottom: 1px solid var(--border-color, #e8e8e8);
}

.admin-table td {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-primary, #333);
  border-bottom: 1px solid var(--border-color, #e8e8e8);
}

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

.admin-table tr:hover td {
  background: var(--bg-secondary, #fafafa);
}

.admin-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-top: 1px solid var(--border-color, #e8e8e8);
}

.admin-pagination-info {
  font-size: 13px;
  color: var(--text-secondary, #666);
}

.admin-pagination-btns {
  display: flex;
  gap: 4px;
}

.admin-pagination-btn {
  padding: 6px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 4px;
  background: #fff;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.admin-pagination-btn:hover:not(:disabled) {
  border-color: var(--primary, #4a6cf7);
  color: var(--primary, #4a6cf7);
}

.admin-pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.admin-pagination-btn.active {
  background: var(--primary, #4a6cf7);
  color: #fff;
  border-color: var(--primary, #4a6cf7);
}

.admin-badge-role {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-badge-role.admin {
  background: #fff7e6;
  color: #d48806;
}

.admin-badge-role.teacher {
  background: #e6f7ff;
  color: #0958d9;
}

.admin-badge-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-badge-status.active {
  background: #f6ffed;
  color: #389e0d;
}

.admin-badge-status.disabled {
  background: #fff1f0;
  color: #cf1322;
}

.admin-badge-login-type {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-badge-login-type.teacher {
  background: #e6f7ff;
  color: #0958d9;
}

.admin-badge-login-type.class {
  background: #f9f0ff;
  color: #722ed1;
}

.admin-badge-sec-php {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background: #ffebee;
  color: #c62828;
}

.admin-badge-sec-ssi {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background: #fff3e0;
  color: #e65100;
}

.admin-badge-sec-input {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background: #e3f2fd;
  color: #1565c0;
}

.admin-badge-migration-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-badge-migration-status.executed {
  background: #e8f5e9;
  color: #2e7d32;
}

.admin-badge-migration-status.pending {
  background: #fff3e0;
  color: #e65100;
}

.admin-action-btn {
  padding: 4px 10px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 4px;
  background: #fff;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  margin-right: 4px;
}

.admin-action-btn:hover {
  border-color: var(--primary, #4a6cf7);
  color: var(--primary, #4a6cf7);
}

.admin-action-btn.danger:hover {
  border-color: #ff4d4f;
  color: #ff4d4f;
}

.admin-action-btn.warning:hover {
  border-color: #faad14;
  color: #faad14;
}

.admin-action-btn.success:hover {
  border-color: #52c41a;
  color: #52c41a;
}

.admin-btn-primary {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  background: var(--primary, #4a6cf7);
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.admin-btn-primary:hover {
  opacity: 0.85;
}

.admin-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  color: var(--text-secondary, #666);
  font-size: 14px;
}

.admin-loading::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color, #e8e8e8);
  border-top-color: var(--primary, #4a6cf7);
  border-radius: 50%;
  animation: admin-spin 0.6s linear infinite;
  margin-right: 8px;
}

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

.admin-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  color: var(--text-secondary, #666);
  gap: 12px;
}

.admin-error-icon {
  font-size: 36px;
}

.admin-error-msg {
  font-size: 14px;
}

.admin-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  color: var(--text-secondary, #666);
  gap: 8px;
}

.admin-empty-icon {
  font-size: 36px;
}

.admin-empty-text {
  font-size: 14px;
}

.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.admin-detail-section {
  margin-bottom: 20px;
}

.admin-detail-section h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary, #333);
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color, #e8e8e8);
}

.admin-detail-list {
  list-style: none;
  padding: 0;
}

.admin-detail-list li {
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-primary, #333);
}

.admin-date-filter {
  display: flex;
  align-items: center;
  gap: 8px;
}

.admin-date-input {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
}

.admin-date-input:focus {
  border-color: var(--primary, #4a6cf7);
}

.admin-badge-update-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-badge-update-status.published {
  background: #e8f5e9;
  color: #2e7d32;
}

.admin-badge-update-status.draft {
  background: #fff3e0;
  color: #e65100;
}

.admin-badge-update-status.revoked {
  background: #ffebee;
  color: #c62828;
}

.admin-btn-danger {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  background: #ff4d4f;
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.admin-btn-danger:hover {
  opacity: 0.85;
}

.admin-btn-secondary {
  padding: 8px 16px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  background: #fff;
  color: var(--text-primary, #333);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.admin-btn-secondary:hover {
  border-color: var(--primary, #4a6cf7);
  color: var(--primary, #4a6cf7);
}

.admin-btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.admin-update-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.admin-form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.admin-form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary, #333);
}

.admin-form-input {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.admin-form-input:focus {
  border-color: var(--primary, #4a6cf7);
}

.admin-form-textarea {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #e8e8e8);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  resize: vertical;
  transition: border-color 0.2s;
}

.admin-form-textarea:focus {
  border-color: var(--primary, #4a6cf7);
}

.admin-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 768px) {
  .admin-sidebar {
    display: none;
  }

  .admin-content {
    padding: 16px;
  }

  .admin-stat-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .admin-table-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .admin-search-input {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .admin-stat-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .admin-stat-card {
    padding: 12px;
  }

  .admin-stat-number {
    font-size: 20px;
  }

  .admin-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .admin-content {
    padding: 12px;
  }

  .admin-table-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .admin-search-input {
    width: 100%;
  }

  .admin-form-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .admin-filter-bar {
    flex-direction: column;
    gap: 8px;
  }
}

/* ===== TTS 配置页面 ===== */

.admin-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  margin-bottom: 20px;
}

.admin-section-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary, #333);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color, #f0f0f0);
}

.admin-tts-subtitle {
  display: block;
  font-size: 13px;
  color: var(--text-secondary, #666);
  margin-top: 4px;
}

.admin-tts-config-card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.admin-tts-config-row {
  display: flex;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color, #f0f0f0);
}

.admin-tts-config-row:last-of-type {
  border-bottom: none;
}

.admin-tts-config-label {
  width: 100px;
  font-size: 13px;
  color: var(--text-secondary, #666);
  flex-shrink: 0;
}

.admin-tts-config-value {
  font-size: 13px;
  color: var(--text-primary, #333);
  font-weight: 500;
}

.admin-tts-config-hint {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--bg-secondary, #f5f6fa);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary, #666);
  line-height: 1.5;
}

.admin-tts-status-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.admin-tts-status-badge.online {
  background: #f6ffed;
  color: #389e0d;
}

.admin-tts-status-badge.offline {
  background: #fff1f0;
  color: #cf1322;
}

.admin-stat-card-unit {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary, #666);
  margin-left: 2px;
}

.admin-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.admin-tts-text-preview {
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.admin-tts-cache-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.admin-tts-cached-yes {
  background: #f6ffed;
  color: #389e0d;
}

.admin-tts-cached-no {
  background: #fff7e6;
  color: #d48806;
}

.admin-tts-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
}

.admin-tts-action-hint {
  font-size: 13px;
  color: var(--text-secondary, #666);
}

.admin-tts-prewarm-result {
  background: #f6ffed;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 8px;
}

.admin-tts-prewarm-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-primary, #333);
}

.admin-tts-prewarm-ok {
  color: #389e0d;
  font-weight: 500;
}

.admin-tts-prewarm-skip {
  color: var(--text-secondary, #666);
}

.admin-tts-prewarm-err {
  color: #cf1322;
  font-weight: 500;
}

/* ===== TTS 提供商管理 ===== */

.admin-tts-provider-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.admin-tts-provider-card {
  background: var(--bg-secondary, #f5f6fa);
  border-radius: 10px;
  padding: 16px;
  border: 1px solid var(--border-color, #e8e8e8);
}

.admin-tts-provider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.admin-tts-provider-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.admin-tts-provider-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary, #333);
}

.admin-tts-provider-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.admin-tts-provider-badge.builtin {
  background: #e6f7ff;
  color: #1890ff;
}

.admin-tts-status-badge.disabled {
  background: #f5f5f5;
  color: #999;
}

.admin-tts-provider-priority {
  font-size: 12px;
  color: var(--text-secondary, #999);
  margin-left: 8px;
}

.admin-tts-provider-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.admin-tts-provider-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary, #888);
  margin-bottom: 8px;
}

.admin-tts-voice-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.admin-tts-voice-label {
  font-size: 12px;
  color: var(--text-secondary, #888);
}

.admin-tts-voice-tag {
  display: inline-block;
  padding: 2px 8px;
  background: #fff;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-primary, #555);
}

.admin-tts-add-row {
  margin-top: 12px;
}

/* ===== TTS 提供商编辑表单 ===== */

.admin-tts-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.admin-tts-form-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-tts-form-label {
  width: 100px;
  font-size: 13px;
  color: var(--text-secondary, #666);
  flex-shrink: 0;
}

.admin-form-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border-color, #d9d9d9);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.admin-form-input:focus {
  border-color: #1890ff;
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.1);
}

.admin-form-select {
  padding: 8px 12px;
  border: 1px solid var(--border-color, #d9d9d9);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  min-width: 220px;
}

.admin-tts-form-hint {
  font-size: 12px;
  color: var(--text-secondary, #999);
  padding: 4px 0 4px 112px;
}

.admin-tts-form-actions {
  display: flex;
  gap: 10px;
  padding-top: 8px;
  padding-left: 112px;
}