/* ========================================
   吕淑宝英文学习
   ======================================== */

/* --- 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 {
  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-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(4, 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); }

.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; }

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

.progress-indicator {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  flex-shrink: 0;
}

.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); }

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

.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 .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; transition: filter 0.3s ease; }

.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); }

.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: 8px; }
.example-item { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.55; padding-left: 14px; position: relative; }
.example-item::before { content: ''; position: absolute; left: 0; top: 8px; 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: 6px; }
.example-cn-item { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.55; 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: 70px; left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 10px 24px; border-radius: 20px;
  font-size: 0.85rem; color: var(--text);
  box-shadow: var(--shadow); opacity: 0;
  transition: all 0.3s ease; z-index: 200; pointer-events: none;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

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

.page-list {
  overflow: hidden;
}

.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-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.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;
}

.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 {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}

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

.list-item-num {
  font-size: 0.7rem;
  color: var(--text-dim);
  min-width: 32px;
  text-align: right;
  flex-shrink: 0;
}

.list-item-word {
  flex: 1;
  min-width: 0;
}

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

.list-item-phonetic {
  font-size: 0.75rem;
  color: var(--accent);
  font-style: italic;
}

.list-item-translation {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.list-item-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
  flex-shrink: 0;
}

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

/* ===========================================
   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(2, 1fr); }
  .btn-tag { min-width: 56px; padding: 8px 10px; }
  .footer { padding: 10px 12px 16px; }
  .list-item { padding: 10px 16px; }
  .list-item-translation { max-width: 120px; }
  .add-content { padding: 12px 16px; }
}

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