/* ========================================
   AI智能记单词
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #242836;
  --bg-panel: #151821;
  --border: #2a2e3d;
  --text: #e4e6ef;
  --text-secondary: #8b8fa3;
  --text-dim: #5a5e72;
  --accent: #6c8cff;
  --accent-hover: #8ba4ff;
  --green: #4ade80;
  --green-bg: rgba(74, 222, 128, 0.1);
  --green-border: rgba(74, 222, 128, 0.25);
  --red: #f87171;
  --red-bg: rgba(248, 113, 113, 0.1);
  --red-border: rgba(248, 113, 113, 0.25);
  --yellow: #facc15;
  --yellow-bg: rgba(250, 204, 21, 0.1);
  --yellow-border: rgba(250, 204, 21, 0.25);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  height: 100dvh;
}

/* --- App Loading Screen --- */
.app-loading {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  transition: opacity 0.3s ease;
}

.app-loading.fade-out {
  opacity: 0;
  pointer-events: none;
}

.app-loading-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.app-loading-logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  animation: loading-logo-pulse 1.5s ease-in-out infinite;
}

@keyframes loading-logo-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.95); }
}

.app-loading-spinner {
  width: 32px;
  height: 32px;
}

.app-loading-spinner .spinner-svg {
  width: 100%;
  height: 100%;
  animation: spin 1s linear infinite;
}

.app-loading-spinner .spinner-circle {
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-dasharray: 80, 200;
  stroke-dashoffset: 0;
  animation: spinner-dash 1.4s ease-in-out infinite;
}

.app-loading-text {
  font-size: 0.85rem;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 720px;
  margin: 0 auto;
  position: relative;
}

/* --- Sync Status --- */
.sync-status {
  padding: 6px 16px;
  font-size: 0.8rem;
  text-align: center;
  transition: all 0.3s ease;
  z-index: 50;
}
.sync-status.info { background: rgba(108, 140, 255, 0.15); color: var(--accent); }
.sync-status.success { background: var(--green-bg); color: var(--green); }
.sync-status.error { background: var(--red-bg); color: var(--red); }

/* --- Page System --- */
.page {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.page.active {
  display: flex;
}

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
  z-index: 100;
}

.logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  cursor: pointer;
  white-space: nowrap;
}

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

.header-divider {
  color: var(--border);
  font-size: 1.2rem;
}

.module-selector {
  position: relative;
  display: inline-block;
}

.module-toggle {
  font-size: 10px;
  color: var(--text-dim);
  padding: 2px 6px;
  line-height: 1;
  border: none;
  background: transparent;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.2s;
}
.module-toggle:hover {
  opacity: 1;
  color: var(--text);
  background: transparent;
}

.module-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--surface);
  border-radius: 12px;
  padding: 8px;
  min-width: 180px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  animation: dropdown-slide-in 0.2s ease-out;
}

.module-dropdown.show {
  display: block;
}

@keyframes dropdown-slide-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.module-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}

.module-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.module-item.active {
  background: rgba(108, 140, 255, 0.15);
  color: var(--accent);
}

.module-item svg {
  flex-shrink: 0;
}

.module-radio {
  font-size: 0.7rem;
  width: 14px;
  text-align: center;
  flex-shrink: 0;
}

.header-right {
  display: flex;
  gap: 2px;
}

/* --- Buttons --- */
.btn {
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text);
  font-family: inherit;
  font-size: 0.875rem;
  transition: all var(--transition);
}

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.btn-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.btn-icon:hover, .btn-icon.active {
  background: var(--bg-hover);
  color: var(--text);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

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

.btn-danger {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.btn-danger:hover { background: rgba(248, 113, 113, 0.2); }

/* --- Panels (Settings & Stats) --- */
.settings-panel, .stats-panel {
  position: absolute;
  top: 57px;
  left: 0;
  right: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  z-index: 90;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.settings-panel.open, .stats-panel.open {
  max-height: 600px;
  overflow-y: auto;
}

.settings-content, .stats-content { padding: 20px; }

.settings-content h3, .stats-content h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  margin-top: 20px;
}

.settings-content h3:first-child, .stats-content h3:first-child { margin-top: 0; }

.settings-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  margin-top: -8px;
}

/* --- Toggle Group --- */
.toggle-group { display: flex; flex-direction: column; gap: 8px; }

.toggle-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}

.toggle-item:hover { background: var(--bg-hover); }

.toggle-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 44px;
  height: 24px;
  background: var(--border);
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  transition: background var(--transition);
  flex-shrink: 0;
}

.toggle-item input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--transition);
}

.toggle-item input[type="checkbox"]:checked { background: var(--accent); }
.toggle-item input[type="checkbox"]:checked::after { left: 22px; background: #fff; }
.toggle-label { font-size: 0.9rem; font-weight: 500; }

/* --- Filter & Order Groups --- */
.filter-group { display: flex; flex-wrap: wrap; gap: 8px; }

.filter-btn {
  padding: 8px 16px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.filter-btn:hover { border-color: var(--accent); color: var(--text); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.filter-btn .count { font-size: 0.75rem; opacity: 0.7; margin-left: 2px; }

.order-group { display: flex; gap: 8px; }

.order-btn {
  padding: 8px 20px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.order-btn:hover { border-color: var(--accent); color: var(--text); }
.order-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.stat-card { background: var(--bg-card); border-radius: var(--radius-sm); padding: 14px; text-align: center; }
.stat-number { font-size: 1.5rem; font-weight: 700; margin-bottom: 2px; }
.stat-label { font-size: 0.75rem; color: var(--text-secondary); }
.stat-unfamiliar .stat-number { color: var(--red); }
.stat-vague .stat-number { color: var(--yellow); }
.stat-familiar .stat-number { color: var(--green); }
.stat-untagged .stat-number { color: var(--accent); }

.progress-bar-container { margin-bottom: 20px; }
.progress-bar { height: 8px; background: var(--bg-card); border-radius: 4px; overflow: hidden; display: flex; }
.progress-fill { height: 100%; transition: width 0.5s ease; }
.progress-fill.familiar { background: var(--green); }
.progress-fill.vague { background: var(--yellow); }
.progress-fill.unfamiliar { background: var(--red); }
.progress-labels { display: flex; justify-content: space-between; margin-top: 6px; font-size: 0.7rem; color: var(--text-dim); }
.label-familiar { color: var(--green); }
.label-vague { color: var(--yellow); }
.label-unfamiliar { color: var(--red); }
.stats-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* --- Study Calendar (学习日历) --- */
.study-calendar {
  margin-top: 4px;
}

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

.calendar-month {
  font-size: 0.95rem;
  font-weight: 600;
}

.calendar-nav {
  width: 32px;
  height: 32px;
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-bottom: 4px;
  font-weight: 600;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.calendar-cell {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  background: var(--bg-card);
  border: 1px solid transparent;
  min-height: 36px;
}

.calendar-cell.empty {
  background: transparent;
  cursor: default;
}

.calendar-cell:not(.empty):hover {
  border-color: var(--border);
}

.calendar-cell.today {
  border-color: var(--accent);
}

.calendar-cell.selected {
  border-color: var(--accent);
  background: rgba(108, 140, 255, 0.15);
}

.calendar-cell.has-data.level-1 { background: rgba(74, 222, 128, 0.1); }
.calendar-cell.has-data.level-2 { background: rgba(74, 222, 128, 0.2); }
.calendar-cell.has-data.level-3 { background: rgba(74, 222, 128, 0.35); }
.calendar-cell.has-data.level-4 { background: rgba(74, 222, 128, 0.5); }

.calendar-day {
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1;
}

.calendar-count {
  font-size: 0.6rem;
  color: var(--green);
  font-weight: 600;
  line-height: 1;
  margin-top: 1px;
}

.calendar-cell.today .calendar-day {
  color: var(--accent);
  font-weight: 700;
}

.calendar-cell.selected .calendar-day {
  color: var(--accent);
}

/* Calendar Detail */
.calendar-detail {
  margin-top: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.calendar-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.calendar-detail-date {
  font-size: 0.9rem;
  font-weight: 600;
}

.calendar-detail-count {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.calendar-detail-list {
  max-height: 200px;
  overflow-y: auto;
}

.calendar-detail-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.calendar-detail-item:last-child {
  border-bottom: none;
}

.calendar-detail-word {
  font-weight: 500;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Study Filter Toggle (筛选区折叠) --- */
.study-filter-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  background: var(--bg);
  flex-shrink: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.study-filter-toggle:active { background: var(--bg-hover); }

.study-filter-toggle-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.study-filter-toggle-label svg { color: var(--accent); }

.study-filter-toggle-arrow {
  color: var(--text-dim);
  transition: transform 0.25s ease;
}

.study-filter-toggle.open .study-filter-toggle-arrow {
  transform: rotate(180deg);
}

.study-filter-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  flex-shrink: 0;
}

.study-filter-panel.open {
  max-height: 200px;
}

/* --- Book Tabs (单词本切换) --- */
.book-tabs {
  display: flex;
  padding: 8px 16px;
  gap: 6px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.book-tabs::-webkit-scrollbar { display: none; }

.book-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}

.book-tab:hover { border-color: var(--accent); color: var(--text); }

.book-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.book-tab-count {
  font-size: 0.75rem;
  opacity: 0.7;
  font-weight: 400;
}

.book-tab.active .book-tab-count { opacity: 0.85; }

.book-tab[data-book="familiar"].active { background: var(--green); border-color: var(--green); }
.book-tab[data-book="vague"].active { background: #d99e00; border-color: #d99e00; }
.book-tab[data-book="unfamiliar"].active { background: var(--red); border-color: var(--red); }
.book-tab[data-book="untagged"].active { background: var(--accent); border-color: var(--accent); }

/* --- Main Content (Study) --- */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
}

/* --- Study Toolbar (排序 + 进度) --- */
.study-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-shrink: 0;
  gap: 8px;
}

.order-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg-card);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--border);
}

.order-toggle-btn {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 8px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.order-toggle-btn:hover { color: var(--text-secondary); }
.order-toggle-btn.active { background: var(--accent); color: #fff; }

.order-toggle-btn svg { flex-shrink: 0; }

.progress-indicator {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  flex-shrink: 0;
}

.progress-clickable {
  cursor: pointer;
  padding: 4px 12px;
  border-radius: 12px;
  transition: all var(--transition);
  user-select: none;
}

.progress-clickable:hover {
  background: var(--bg-card);
  color: var(--text-secondary);
}

.progress-clickable:active {
  transform: scale(0.96);
}

/* --- Goto Dialog (跳转弹窗) --- */
.goto-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.goto-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  min-width: 280px;
  box-shadow: var(--shadow);
  animation: slideUp 0.2s ease;
}

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

.goto-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.goto-mode-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}

.goto-mode-btn {
  flex: 1;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.goto-mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.goto-mode-btn:not(.active):hover {
  border-color: var(--accent);
  color: var(--accent);
}

.goto-mode-panel {
  /* placeholder for spacing */
}

.goto-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: -8px;
  margin-bottom: 14px;
}

.goto-hash {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.goto-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.goto-input {
  flex: 1;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1.1rem;
  font-family: inherit;
  text-align: center;
  outline: none;
  transition: border-color var(--transition);
  -moz-appearance: textfield;
}

.goto-input::-webkit-outer-spin-button,
.goto-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.goto-input:focus { border-color: var(--accent); }

.goto-total {
  color: var(--text-dim);
  font-size: 0.9rem;
  white-space: nowrap;
}

.goto-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.goto-dir-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.goto-dir-group {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}

.goto-dir-btn {
  flex: 1;
  padding: 8px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.goto-dir-btn:hover { border-color: var(--accent); color: var(--text); }
.goto-dir-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* --- Word ID Badge --- */
.word-id {
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
  font-family: monospace;
  letter-spacing: 0.5px;
}

.current-tag-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-left: 8px;
  vertical-align: middle;
}

.current-tag-badge.tag-unfamiliar { background: var(--red-bg); color: var(--red); border: 1px solid var(--red-border); }
.current-tag-badge.tag-vague { background: var(--yellow-bg); color: var(--yellow); border: 1px solid var(--yellow-border); }
.current-tag-badge.tag-familiar { background: var(--green-bg); color: var(--green); border: 1px solid var(--green-border); }
.current-tag-badge.tag-untagged { background: rgba(108, 140, 255, 0.1); color: var(--accent); border: 1px solid rgba(108, 140, 255, 0.25); }

/* --- Word Card --- */
.card-container { flex: 1; display: flex; align-items: flex-start; overflow-y: auto; }

/* --- Card Loading Skeleton --- */
.card-loading {
  width: 100%;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-spinner {
  width: 36px;
  height: 36px;
}

.spinner-svg {
  width: 100%;
  height: 100%;
  animation: spin 1s linear infinite;
}

.spinner-circle {
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-dasharray: 80, 200;
  stroke-dashoffset: 0;
  animation: spinner-dash 1.4s ease-in-out infinite;
}

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

@keyframes spinner-dash {
  0% { stroke-dasharray: 1, 200; stroke-dashoffset: 0; }
  50% { stroke-dasharray: 80, 200; stroke-dashoffset: -35; }
  100% { stroke-dasharray: 80, 200; stroke-dashoffset: -125; }
}

.loading-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.skeleton-card {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.skeleton-line {
  height: 16px;
  background: linear-gradient(90deg, var(--border) 25%, rgba(108, 140, 255, 0.08) 50%, var(--border) 75%);
  background-size: 200% 100%;
  border-radius: 8px;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

.skeleton-word { height: 28px; width: 55%; }
.skeleton-phonetic { height: 14px; width: 35%; opacity: 0.6; }
.skeleton-example { width: 90%; }
.skeleton-example.short { width: 65%; }
.skeleton-translation { width: 50%; }

.skeleton-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
  opacity: 0.5;
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.card-loading .loading-text {
  animation: loading-pulse 2s ease-in-out infinite;
}

@keyframes loading-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.word-card {
  width: 100%;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.15s ease;
}

.word-card:active { transform: scale(0.995); }

.card-section { padding: 20px 24px; border-bottom: 1px solid var(--border); }
.card-section:last-child { border-bottom: none; }
.card-section.hidden-section { display: none; }

.card-section.blurred .section-label,
.card-section.blurred .word-text,
.card-section.blurred .phonetic-text,
.card-section.blurred .example-list,
.card-section.blurred .translation-text,
.card-section.blurred .example-cn-list { filter: blur(8px); user-select: none; pointer-events: none; }

.card-section.revealed .section-label,
.card-section.revealed .word-text,
.card-section.revealed .phonetic-text,
.card-section.revealed .example-list,
.card-section.revealed .translation-text,
.card-section.revealed .example-cn-list { filter: blur(0); transition: filter 0.3s ease; }

.section-word { padding: 24px 24px 20px; }
.word-text { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 6px; line-height: 1.3; }
.phonetic-text { font-size: 1rem; color: var(--accent); font-weight: 500; font-style: italic; }

.section-label { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); margin-bottom: 10px; }

.example-list { display: flex; flex-direction: column; gap: 10px; }
.example-item { font-size: 1.02rem; color: var(--text-secondary); line-height: 1.6; padding-left: 14px; position: relative; display: flex; align-items: baseline; gap: 2px; }
.example-item::before { content: ''; position: absolute; left: 0; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); opacity: 0.5; }

.translation-text { font-size: 1.05rem; line-height: 1.7; white-space: pre-line; }

.example-cn-list { display: flex; flex-direction: column; gap: 8px; }
.example-cn-item { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; padding-left: 14px; position: relative; }
.example-cn-item::before { content: ''; position: absolute; left: 0; top: 8px; width: 5px; height: 5px; border-radius: 50%; background: var(--green); opacity: 0.4; }

.empty-state { padding: 60px 24px; text-align: center; }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-text { color: var(--text-secondary); margin-bottom: 20px; }

.reveal-hint { text-align: center; padding: 8px; flex-shrink: 0; opacity: 0; transition: opacity 0.3s ease; pointer-events: none; }
.reveal-hint.visible { opacity: 1; }
.reveal-hint span { font-size: 0.75rem; color: var(--text-dim); background: var(--bg-hover); padding: 4px 14px; border-radius: 12px; }

/* --- Footer --- */
.footer {
  padding: 12px 16px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
  z-index: 50;
}

.nav-controls { display: flex; align-items: center; justify-content: space-between; gap: 8px; }

.btn-nav {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  flex-shrink: 0;
}

.btn-nav:hover { background: var(--bg-hover); color: var(--text); border-color: var(--accent); }
.btn-nav:disabled { opacity: 0.3; pointer-events: none; }

.tag-controls { display: flex; gap: 8px; flex: 1; justify-content: center; }

.btn-tag {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 8px 14px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 2px solid transparent;
  min-width: 64px; transition: all var(--transition);
}

.btn-tag .tag-icon { font-size: 1.1rem; }
.btn-tag .tag-text { font-size: 0.65rem; color: var(--text-dim); }
.btn-tag:hover { background: var(--bg-hover); }
.btn-tag.tag-unfamiliar:hover, .btn-tag.tag-unfamiliar.active { border-color: var(--red-border); background: var(--red-bg); }
.btn-tag.tag-vague:hover, .btn-tag.tag-vague.active { border-color: var(--yellow-border); background: var(--yellow-bg); }
.btn-tag.tag-familiar:hover, .btn-tag.tag-familiar.active { border-color: var(--green-border); background: var(--green-bg); }

/* --- Animations --- */
.word-card.swipe-left { animation: swipeLeft 0.25s ease forwards; }
.word-card.swipe-right { animation: swipeRight 0.25s ease forwards; }
.word-card.enter-right { animation: enterRight 0.25s ease forwards; }
.word-card.enter-left { animation: enterLeft 0.25s ease forwards; }

@keyframes swipeLeft { 0% { transform: translateX(0); opacity: 1; } 100% { transform: translateX(-60px); opacity: 0; } }
@keyframes swipeRight { 0% { transform: translateX(0); opacity: 1; } 100% { transform: translateX(60px); opacity: 0; } }
@keyframes enterRight { 0% { transform: translateX(60px); opacity: 0; } 100% { transform: translateX(0); opacity: 1; } }
@keyframes enterLeft { 0% { transform: translateX(-60px); opacity: 0; } 100% { transform: translateX(0); opacity: 1; } }

/* --- Toast --- */
.toast {
  position: fixed; top: 20px; left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 12px 28px; border-radius: 12px;
  font-size: 0.9rem; font-weight: 500; color: var(--text);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4); opacity: 0;
  transition: all 0.3s ease; z-index: 10000; pointer-events: none;
  max-width: 90vw; text-align: center;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast-success { border-color: #22c55e; color: #22c55e; background: linear-gradient(135deg, var(--bg-card), rgba(34,197,94,0.08)); }
.toast.toast-error { border-color: #ef4444; color: #ef4444; background: linear-gradient(135deg, var(--bg-card), rgba(239,68,68,0.08)); }

/* --- Help Docs (使用帮助) --- */
.help-section { margin-bottom: 16px; }
.help-section h4 { font-size: 0.95rem; font-weight: 600; margin: 0 0 6px; color: var(--text); }
.help-section p { margin: 4px 0; color: var(--text-secondary); }
.help-section ul { color: var(--text-secondary); }
.help-section kbd {
  display: inline-block; padding: 1px 6px; font-size: 0.8em;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 4px;
  font-family: monospace; color: var(--text);
}

/* ===========================================
   PAGE: WORD LIST
   =========================================== */

.page-list {
  overflow: hidden;
}

/* --- List Toolbar Toggle (列表工具栏折叠) --- */
.list-toolbar-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  background: var(--bg);
  flex-shrink: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.list-toolbar-toggle:active { background: var(--bg-hover); }

.list-toolbar-toggle-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.list-toolbar-toggle-label svg { color: var(--accent); }

.list-toolbar-toggle-arrow {
  color: var(--text-dim);
  transition: transform 0.25s ease;
}

.list-toolbar-toggle-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.list-toolbar-toggle.open .list-toolbar-toggle-arrow {
  transform: rotate(180deg);
}

/* 释义显示开关 */
.list-show-trans-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  font-size: 0.72rem;
  color: var(--text-dim);
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg-hover);
  transition: all 0.2s;
  user-select: none;
}

.list-show-trans-toggle:hover {
  color: var(--accent);
  background: rgba(108, 140, 255, 0.1);
}

.list-show-trans-toggle input[type="checkbox"] {
  width: 13px;
  height: 13px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.list-show-trans-label {
  font-weight: 500;
}

.list-toolbar-collapsible {
  display: none;
}

.list-toolbar-collapsible.open {
  display: block;
}

.list-toolbar {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.list-search {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  margin-bottom: 10px;
}

.list-search svg { flex-shrink: 0; color: var(--text-dim); }

.list-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  width: 100%;
}

.list-search input::placeholder { color: var(--text-dim); }

.list-book-selector {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
  margin-bottom: 2px;
}

.list-book-selector::-webkit-scrollbar { display: none; }

.list-book-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}

.list-book-btn:hover { border-color: var(--accent); color: var(--text); }
.list-book-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.list-book-count {
  font-size: 0.7rem;
  opacity: 0.8;
  background: rgba(255,255,255,0.2);
  padding: 1px 5px;
  border-radius: 8px;
  min-width: 18px;
  text-align: center;
}

.list-book-btn:not(.active) .list-book-count {
  background: var(--bg);
}

.list-filters {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex: 1;
  min-width: 0;
}

.list-filters::-webkit-scrollbar { display: none; }

.list-toolbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.list-sort-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg-card);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.list-sort-btn {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px 7px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.list-sort-btn:hover { color: var(--text-secondary); }
.list-sort-btn.active { background: var(--accent); color: #fff; }
.list-sort-btn svg { flex-shrink: 0; }

.list-filter-btn {
  padding: 5px 12px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}

.list-filter-btn:hover { border-color: var(--accent); color: var(--text); }
.list-filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.list-container {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

.list-item {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

/* --- Main row (always visible) --- */
.list-item-main {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.list-item-main:hover { background: var(--bg-hover); }

.list-item-num {
  font-size: 0.65rem;
  color: var(--text-dim);
  min-width: 28px;
  text-align: right;
  flex-shrink: 0;
  font-family: monospace;
}

.list-item-word-text {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-item-phonetic {
  font-size: 0.72rem;
  color: var(--accent);
  font-style: italic;
  margin-left: 6px;
  flex-shrink: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-item-word {
  display: flex;
  align-items: baseline;
  flex: 0 1 auto;
  min-width: 60px;
  max-width: 45%;
  gap: 0;
}

.list-item-trans {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.list-item-tag {
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: 10px;
  flex-shrink: 0;
  font-weight: 500;
}

.list-item-tag.tag-unfamiliar { background: var(--red-bg); color: var(--red); }
.list-item-tag.tag-vague { background: var(--yellow-bg); color: var(--yellow); }
.list-item-tag.tag-familiar { background: var(--green-bg); color: var(--green); }
.list-item-tag.tag-untagged { background: rgba(108, 140, 255, 0.1); color: var(--accent); }

.list-item-main .btn-action-speak {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border: none;
  background: none;
}

.list-item-expand-arrow {
  color: var(--text-dim);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.list-item.detail-open .list-item-expand-arrow {
  transform: rotate(180deg);
}

/* --- Detail panel (collapsed by default) --- */
.list-item-detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
  background: var(--bg-panel);
}

.list-item-detail-inner {
  overflow: hidden;
}

.list-item.detail-open .list-item-detail {
  grid-template-rows: 1fr;
}

.list-item.detail-open .list-item-main {
  background: var(--bg-hover);
}

.list-detail-phonetic {
  padding: 8px 16px 0;
  font-size: 0.85rem;
  color: var(--accent);
  font-style: italic;
}

.list-detail-section {
  padding: 8px 16px;
}

.list-detail-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.list-detail-translation {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  white-space: pre-line;
}

.list-detail-examples {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.list-detail-example {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
  padding-left: 10px;
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.list-detail-example::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.list-detail-example-cn {
  font-size: 0.78rem;
  color: var(--text-dim);
  padding-left: 10px;
  margin-top: 1px;
}

.list-detail-book {
  padding: 4px 16px 0;
  font-size: 0.72rem;
  color: var(--accent);
}

.list-detail-actions {
  display: flex;
  gap: 8px;
  padding: 10px 16px 12px;
  border-top: 1px solid var(--border);
  margin-top: 6px;
}

.list-detail-actions .btn-action {
  width: auto;
  padding: 5px 12px;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
}

.list-detail-actions .btn-action span {
  font-size: 0.75rem;
}

.list-detail-actions .btn-action-study:hover { color: var(--accent); border-color: var(--accent); }
.list-detail-actions .btn-action-edit:hover { color: var(--accent); border-color: var(--accent); }
.list-detail-actions .btn-action-delete:hover { color: var(--red); border-color: var(--red); }

.list-status {
  padding: 10px 20px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* Highlight animation for scroll-to-id */
.list-item-highlight .list-item-main {
  animation: highlight-pulse 2.5s ease-out;
}

@keyframes highlight-pulse {
  0% { background: rgba(108, 140, 255, 0.25); }
  30% { background: rgba(108, 140, 255, 0.15); }
  100% { background: transparent; }
}

/* ===========================================
   PAGE: ADD WORD
   =========================================== */

.page-add {
  overflow-y: auto;
}

.add-content {
  padding: 16px 20px;
}

.add-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.add-tab {
  flex: 1;
  padding: 10px;
  background: var(--bg-card);
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.add-tab:first-child { border-right: 1px solid var(--border); }
.add-tab:hover { color: var(--text); }
.add-tab.active { background: var(--accent); color: #fff; }

.add-panel { }

.form-group { margin-bottom: 16px; }

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-label .required { color: var(--red); }

.form-input, .form-textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-input:focus, .form-textarea:focus { border-color: var(--accent); }
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-dim); }
.form-textarea { resize: vertical; line-height: 1.5; }

.form-check {
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-check label { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.form-check input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }

.form-actions { margin-bottom: 16px; }

.add-result {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  display: none;
}

.add-result.success { display: block; background: var(--green-bg); color: var(--green); border: 1px solid var(--green-border); }
.add-result.error { display: block; background: var(--red-bg); color: var(--red); border: 1px solid var(--red-border); }

.batch-options { margin-bottom: 16px; }
.batch-options h4 { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 10px; }

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.radio-group label:hover { background: var(--bg-hover); }
.radio-group input[type="radio"] { accent-color: var(--accent); }

.file-drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 16px;
}

.file-drop-zone:hover, .file-drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(108, 140, 255, 0.05);
  color: var(--text-secondary);
}

.file-drop-zone svg { margin-bottom: 8px; }
.file-drop-zone p { font-size: 0.85rem; }

.batch-progress { margin-bottom: 16px; }

.batch-progress-bar {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}

.batch-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.batch-progress-text { font-size: 0.75rem; color: var(--text-dim); text-align: center; }

/* --- Safe Area --- */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .footer { padding-bottom: calc(16px + env(safe-area-inset-bottom)); }
}

/* --- Responsive --- */
@media (max-width: 480px) {
  .header { padding: 10px 16px; }
  .logo { font-size: 0.95rem; }
  .main-content { padding: 12px 16px; }
  .card-section { padding: 16px 18px; }
  .section-word { padding: 20px 18px 16px; }
  .word-text { font-size: 1.4rem; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .btn-tag { min-width: 56px; padding: 8px 10px; }
  .footer { padding: 10px 12px 16px; }
  .list-item-main { padding: 8px 12px; }
  .add-content { padding: 12px 16px; }
  .auth-container { padding: 24px 20px; }
  .admin-content { padding: 12px 16px; }
  .user-menu { right: 10px; min-width: 160px; }
  .export-group { gap: 6px; }
  .export-group .btn-secondary { font-size: 0.75rem; padding: 6px 10px; }
  .book-tabs { padding: 6px 12px; gap: 4px; }
  .book-tab { padding: 6px 12px; font-size: 0.8rem; }
  .order-toggle-btn { padding: 3px 6px; font-size: 0.68rem; }
  .order-toggle-btn span { display: none; }
  .goto-dialog { min-width: 240px; padding: 20px; }
}

/* ===========================================
   AUTH PAGE (登录/注册)
   =========================================== */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 32px 28px;
  box-shadow: var(--shadow);
}

.auth-logo {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.auth-tab {
  flex: 1;
  padding: 10px;
  background: var(--bg);
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.auth-tab:first-child { border-right: 1px solid var(--border); }
.auth-tab:hover { color: var(--text); }
.auth-tab.active { background: var(--accent); color: #fff; }

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.auth-form .form-group { margin-bottom: 16px; }

.auth-result {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  display: none;
}

.auth-result.success {
  display: block;
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.auth-result.error {
  display: block;
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

/* --- Block Button --- */
.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

/* --- Small Button --- */
.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

/* --- Form Hint --- */
.form-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ===========================================
   USER MENU (用户下拉菜单)
   =========================================== */
.user-menu {
  position: absolute;
  top: 57px;
  right: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  z-index: 150;
  min-width: 180px;
  padding: 16px;
}

.user-menu-info {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.user-menu-name {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.user-menu-role {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* TTS Speed selector */
.tts-speed-group {
  display: flex;
  gap: 4px;
  background: var(--bg-panel);
  padding: 3px;
  border-radius: 8px;
}
.tts-speed-btn {
  flex: 1;
  padding: 5px 0;
  font-size: 0.78em;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}
.tts-speed-btn:hover {
  background: rgba(108, 140, 255, 0.1);
}
.tts-speed-btn.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ===========================================
   ADMIN PANEL (管理后台)
   =========================================== */
.page-admin {
  overflow-y: auto;
}

.admin-content {
  padding: 16px 20px;
}

.admin-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.admin-tab {
  flex: 1;
  padding: 10px;
  background: var(--bg-card);
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.admin-tab:not(:last-child) { border-right: 1px solid var(--border); }
.admin-tab:hover { color: var(--text); }
.admin-tab.active { background: var(--accent); color: #fff; }

.admin-panel {
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

.admin-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition: border-color var(--transition);
}

.admin-item:hover { border-color: var(--accent); }

.admin-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 8px;
}

.admin-item-header strong {
  font-size: 0.9rem;
}

.admin-type {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(108, 140, 255, 0.15);
  color: var(--accent);
}

.admin-role {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--yellow-bg);
  color: var(--yellow);
  margin-left: 6px;
}

.admin-time {
  font-size: 0.7rem;
  color: var(--text-dim);
  flex-shrink: 0;
}

.admin-item-detail {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 10px;
}

.admin-item-actions {
  display: flex;
  gap: 8px;
}

/* Approval detail styles */
.approval-detail-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  font-size: 0.88em;
}
.approval-detail-grid .adl {
  color: var(--text-dim);
  white-space: nowrap;
}
.approval-detail-grid .adv {
  color: var(--text-secondary);
  word-break: break-all;
}
.approval-words-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 300px;
  overflow-y: auto;
}
.approval-word-item {
  padding: 6px 8px;
  background: var(--bg);
  border-radius: 5px;
  border: 1px solid var(--border);
}
.approval-word-item .awi-header {
  margin-bottom: 3px;
}
.approval-word-item .awi-row {
  display: flex;
  gap: 8px;
  margin-top: 2px;
  color: var(--text-secondary);
  font-size: 0.9em;
  line-height: 1.4;
}
.approval-word-item .awi-label {
  color: var(--text-dim);
  font-size: 0.85em;
  white-space: nowrap;
  min-width: 40px;
}

/* ===========================================
   PREVIEW AREA (预览区域)
   =========================================== */
.preview-area {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.preview-area h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.preview-word {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.preview-section {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.preview-section .section-label {
  margin-bottom: 6px;
}

.preview-edit-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 10px;
  text-align: center;
}

.preview-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 400px;
  overflow-y: auto;
}

.preview-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.4;
}

.preview-num {
  font-size: 0.7rem;
  color: var(--text-dim);
  min-width: 24px;
  text-align: right;
  flex-shrink: 0;
}

.preview-more {
  text-align: center;
  padding: 10px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Batch preview full card */
.preview-batch-card {
  display: flex;
  gap: 10px;
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.preview-batch-num {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 600;
  min-width: 20px;
  text-align: right;
  flex-shrink: 0;
  padding-top: 2px;
}

.preview-batch-body {
  flex: 1;
  min-width: 0;
}

.preview-batch-body .preview-word {
  font-size: 1rem;
  margin-bottom: 8px;
}

.preview-batch-body .preview-section {
  margin-top: 6px;
  padding-top: 6px;
}

.preview-batch-body .example-item,
.preview-batch-body .example-cn-item {
  font-size: 0.82rem;
}

/* ===========================================
   EXPORT GROUP (导出按钮组)
   =========================================== */
.export-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.export-group .btn-secondary {
  font-size: 0.8rem;
  padding: 7px 14px;
}

/* --- Logo Icon --- */
.logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  vertical-align: middle;
  margin-right: 6px;
  object-fit: cover;
}

.auth-logo .logo-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin-right: 0;
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

/* --- Word Action Buttons (编辑/删除) --- */
.word-actions {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

.word-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.btn-action {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
  flex-shrink: 0;
}

.btn-action:hover {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--text-dim);
}

.btn-action.btn-action-edit:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-action.btn-action-delete:hover {
  color: var(--red);
  border-color: var(--red);
}

/* Speak (TTS) button */
.btn-action.btn-action-speak {
  color: var(--accent);
  border-color: transparent;
}
.btn-action.btn-action-speak:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.btn-action.btn-action-speak.speaking {
  color: var(--accent);
  animation: pulse-speak 0.8s ease-in-out infinite;
}
@keyframes pulse-speak {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.15); }
}

/* Inline speak button for examples */
.btn-speak-inline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent);
  opacity: 0.45;
  padding: 0 2px;
  margin-left: 5px;
  vertical-align: middle;
  transition: opacity 0.2s, transform 0.2s;
  line-height: 1;
}
.btn-speak-inline:hover {
  opacity: 1;
}
.btn-speak-inline.speaking {
  opacity: 1;
  animation: pulse-speak 0.8s ease-in-out infinite;
}

/* Clickable words in examples */
.clickable-word {
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s;
  padding: 0 1px;
}
.clickable-word:hover {
  background: rgba(108, 140, 255, 0.15);
  color: var(--accent);
}
.clickable-word:active {
  background: rgba(108, 140, 255, 0.25);
}

/* Book checkbox group (multi-select) */
.book-checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px;
  background: var(--bg-panel, #1a1a2e);
  border: 1px solid var(--border, #333);
  border-radius: 8px;
  max-height: 120px;
  overflow-y: auto;
}
.book-checkbox-group label {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.book-checkbox-group label:hover {
  background: rgba(108, 140, 255, 0.1);
}
.book-checkbox-group input[type="checkbox"] {
  accent-color: var(--accent, #6c8cff);
}

/* List item actions are now in detail panel, no need for hover-show */

@media (max-width: 480px) {
  .list-item-main { padding: 8px 12px; gap: 6px; }
  .list-item-num { min-width: 24px; font-size: 0.6rem; }
  .list-item-phonetic { display: none; }
  .list-item-trans { font-size: 0.72rem; }
  .list-item-word { max-width: 35%; }
  .list-detail-section { padding: 6px 12px; }
  .list-detail-actions { padding: 8px 12px 10px; }
}

/* --- Modal (弹窗) --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.15s ease;
  padding: 20px;
}

.modal-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  animation: slideUp 0.2s ease;
}

.modal-dialog-sm {
  max-width: 380px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-title {
  font-size: 1rem;
  font-weight: 600;
}

.modal-close {
  font-size: 1.3rem;
  color: var(--text-dim);
  width: 32px;
  height: 32px;
}

.modal-close:hover {
  color: var(--text);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-body .form-group {
  margin-bottom: 14px;
}

.modal-body .form-group:last-of-type {
  margin-bottom: 0;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-result {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.modal-result.success {
  display: block;
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.modal-result.error {
  display: block;
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

.delete-confirm-text {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 8px;
}

.delete-confirm-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===========================================
   EDIT MODAL: AI Generate & Preview
   =========================================== */
.modal-dialog-edit {
  max-width: 520px;
}

.edit-ai-section {
  margin-top: 16px;
  padding: 12px 14px;
  background: rgba(108, 140, 255, 0.06);
  border: 1px solid rgba(108, 140, 255, 0.15);
  border-radius: var(--radius-sm);
}

.edit-ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.edit-ai-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
}

.edit-ai-actions {
  display: flex;
  gap: 6px;
}

.btn-ai-generate {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  background: rgba(108, 140, 255, 0.12);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-ai-generate:hover {
  background: var(--accent);
  color: #fff;
}

.btn-ai-generate:disabled {
  opacity: 0.5;
  pointer-events: none;
}

.btn-ai-generate.generating {
  animation: ai-pulse 1.2s ease-in-out infinite;
}

@keyframes ai-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.edit-ai-hint {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 6px;
  line-height: 1.4;
}

/* AI 生成进度条 */
.edit-ai-progress {
  margin-top: 12px;
}

.edit-ai-progress-bar {
  height: 4px;
  background: var(--bg-card);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.edit-ai-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
  width: 0%;
  animation: progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes progress-indeterminate {
  0% { width: 0%; margin-left: 0; }
  50% { width: 60%; margin-left: 20%; }
  100% { width: 0%; margin-left: 100%; }
}

.edit-ai-progress-text {
  font-size: 0.75rem;
  color: var(--accent);
  text-align: center;
}

/* 预览区域 */
.edit-preview-area {
  margin-top: 16px;
  border: 1px solid var(--green-border);
  border-radius: var(--radius-sm);
  background: rgba(74, 222, 128, 0.04);
  overflow: hidden;
}

.edit-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(74, 222, 128, 0.08);
  border-bottom: 1px solid var(--green-border);
  gap: 8px;
}

.edit-preview-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--green);
  white-space: nowrap;
}

.edit-preview-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.edit-preview-actions .btn-sm {
  font-size: 0.72rem;
  padding: 4px 10px;
}

.edit-preview-card {
  padding: 14px;
}

.edit-preview-card .preview-word {
  font-size: 1rem;
  margin-bottom: 8px;
}

.edit-preview-card .preview-section {
  margin-top: 6px;
  padding-top: 6px;
}

.edit-preview-hint {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-align: center;
  padding: 0 14px 10px;
}

/* 表单预览模式（预览当前表单内容）*/
.edit-form-preview-area {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  overflow: hidden;
}

.edit-form-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.edit-form-preview-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.edit-form-preview-card {
  padding: 14px;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ===========================================
   BOOK SELECTOR (单词本选择器)
   =========================================== */
.book-selector {
  display: flex;
  padding: 6px 16px;
  gap: 6px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.book-selector::-webkit-scrollbar { display: none; }

.book-sel-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}

.book-sel-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.book-sel-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.book-sel-name { }

.book-sel-count {
  font-size: 0.68rem;
  opacity: 0.65;
  font-weight: 400;
}

.book-sel-btn.active .book-sel-count { opacity: 0.85; }

.book-sel-manage {
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 5px 10px;
}

.book-sel-manage:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ===========================================
   BOOK MANAGER (单词本管理弹窗)
   =========================================== */
.book-manager-create-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.book-manager-create-row .form-input {
  flex: 1;
}

.book-manager-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 300px;
  overflow-y: auto;
}

.book-manager-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.book-manager-item:hover {
  border-color: var(--text-dim);
}

.book-manager-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 600;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-manager-count {
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.book-manager-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* ===========================================
   LIST ITEM BOOK BADGE (列表中的单词本标签)
   =========================================== */
.list-item-book {
  font-size: 0.65rem;
  padding: 1px 7px;
  border-radius: 8px;
  background: rgba(108, 140, 255, 0.1);
  color: var(--accent);
  border: 1px solid rgba(108, 140, 255, 0.2);
  flex-shrink: 0;
  white-space: nowrap;
}

/* ===========================================
   FORM SELECT (下拉框样式)
   =========================================== */
.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%238b8fa3' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

.form-select:focus {
  border-color: var(--accent);
}

.form-select option {
  background: var(--bg-card);
  color: var(--text);
}

@media (max-width: 480px) {
  .book-selector { padding: 4px 12px; gap: 4px; }
  .book-sel-btn { padding: 4px 10px; font-size: 0.72rem; }
  .book-manager-item { padding: 8px 10px; }
  .book-manager-actions .btn-sm { padding: 4px 8px; font-size: 0.72rem; }
  .list-item-book { font-size: 0.6rem; padding: 1px 5px; }
}