/* ============================================================
   HSK 1 Toolkit — dyslexia-friendly, flat, minimal
   ============================================================ */

:root {
  /* Tone colors — dyslexia-optimized palette */
  --tone-1: #D85A30;  /* coral/red */
  --tone-2: #EF9F27;  /* amber */
  --tone-3: #639922;  /* green */
  --tone-4: #378ADD;  /* blue */
  --tone-5: #888780;  /* neutral gray */

  /* Tone backgrounds (subtle tints for boxes) */
  --tone-1-bg: #FBE8E0;
  --tone-2-bg: #FCF0DB;
  --tone-3-bg: #E7F0D9;
  --tone-4-bg: #DCEBF8;
  --tone-5-bg: #EEEDEB;

  /* Neutral */
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --text: #1A1A1A;
  --text-muted: #6B6B6B;
  --border: #E5E5E5;
  --border-strong: #D0D0D0;

  --tab-height: 60px;
  --font-size-base: 16px;
}

/* Manual light theme — force light regardless of system */
html[data-theme="light"] {
  color-scheme: light;
}

/* Manual dark theme */
html[data-theme="dark"] {
  --bg: #121212;
  --surface: #1C1C1C;
  --text: #E8E8E8;
  --text-muted: #9A9A9A;
  --border: #2A2A2A;
  --border-strong: #3A3A3A;
  --tone-1-bg: #3A1E15;
  --tone-2-bg: #3A2B10;
  --tone-3-bg: #1F2C12;
  --tone-4-bg: #132A40;
  --tone-5-bg: #252525;
  color-scheme: dark;
}

/* Auto mode — follow system preference (only when data-theme="auto" or unset) */
@media (prefers-color-scheme: dark) {
  html[data-theme="auto"], html:not([data-theme]) {
    --bg: #121212;
    --surface: #1C1C1C;
    --text: #E8E8E8;
    --text-muted: #9A9A9A;
    --border: #2A2A2A;
    --border-strong: #3A3A3A;
    --tone-1-bg: #3A1E15;
    --tone-2-bg: #3A2B10;
    --tone-3-bg: #1F2C12;
    --tone-4-bg: #132A40;
    --tone-5-bg: #252525;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: 1.5;
  padding-bottom: calc(var(--tab-height) + 16px);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body[data-font-size="small"]  { --font-size-base: 14px; }
body[data-font-size="medium"] { --font-size-base: 16px; }
body[data-font-size="large"]  { --font-size-base: 18px; }

/* ============================================================
   Main container
   ============================================================ */
#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px;
}

.page-title {
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 20px;
  color: var(--text);
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: -14px;
  margin-bottom: 20px;
}

/* ============================================================
   Bottom tab navigation
   ============================================================ */
#tabs {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--tab-height);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 100;
}

#tabs .tab {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.15s;
  min-height: 44px;
}

#tabs .tab.active {
  color: var(--text);
  border-top: 2px solid var(--text);
}

#tabs .tab:hover { color: var(--text); }

/* ============================================================
   Cards (tool grid, list items)
   ============================================================ */
.tools-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.guide-btn { padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--surface); color: var(--text); font-size: 13px; font-family: inherit; cursor: pointer; min-height: 44px; white-space: nowrap; }
.guide-btn:hover { border-color: var(--text); }

/* Guide page */
.guide { padding-bottom: 40px; }
.guide-section { margin-bottom: 28px; }
.guide-section h2 { font-size: 15px; font-weight: 500; color: var(--text); margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); text-transform: uppercase; letter-spacing: 0.5px; }
.guide-section p { font-size: 14px; line-height: 1.6; color: var(--text); margin-bottom: 10px; }
.guide-stages { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.guide-stages li { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; line-height: 1.5; }
.stage-num { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--text); color: var(--bg); display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 14px; }
.guide-tool { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.guide-note { font-size: 12px; color: var(--text-muted); margin-top: 4px; font-style: italic; }
.guide-table { width: 100%; font-size: 14px; }
.guide-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.guide-table td:first-child { font-weight: 500; color: var(--text-muted); white-space: nowrap; width: 60px; }
.guide-rules { list-style: decimal; padding-left: 20px; font-size: 14px; line-height: 1.5; }
.guide-rules li { margin-bottom: 14px; }
.guide-dl dt { font-weight: 500; font-size: 14px; margin-top: 12px; color: var(--text); }
.guide-dl dt:first-child { margin-top: 0; }
.guide-dl dd { font-size: 13px; color: var(--text-muted); margin-left: 12px; margin-top: 2px; }
.guide-list { list-style: disc; padding-left: 20px; font-size: 13px; line-height: 1.6; color: var(--text); }
.guide-list li { margin-bottom: 6px; }
.guide-list.guide-avoid li { color: var(--text-muted); }
.guide-hint { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; font-style: italic; }
.routine-block { border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-bottom: 12px; background: var(--surface); }
.routine-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.routine-time { font-size: 16px; font-weight: 600; color: var(--text); padding: 4px 10px; background: var(--text); color: var(--bg); border-radius: 6px; }
.routine-mood { font-size: 12px; color: var(--text-muted); }
.routine-block .guide-table td { font-size: 13px; padding: 6px 8px; }
.routine-block .guide-table td:first-child { width: 52px; font-size: 12px; }
.routine-tutor { border-color: var(--tone-2); background: var(--tone-2-bg); }
.routine-tutor .routine-time { background: var(--tone-2); }
.routine-stuck { border-style: dashed; opacity: 0.85; }
.routine-stuck .routine-time { background: var(--text-muted); }
.guide-goal { padding: 16px; background: var(--tone-5-bg); border-radius: 10px; }
.guide-goal h2 { border: none; margin-bottom: 6px; padding: 0; }
.guide-section em { font-style: italic; color: var(--text); }

.tool-group {
  margin-bottom: 24px;
}

.tool-group-label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.tgl-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tgl-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tool-card {
  background: var(--surface);
  border: 0.5px solid var(--border-strong);
  border-radius: 12px;
  padding: 14px 14px;
  cursor: pointer;
  transition: border-color 0.15s;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.tool-card:hover { border-color: var(--text); }

.tool-card .tool-num {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.tool-card .tool-name {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
}

.tool-card .tool-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================================================
   Syllable boxes (tone-colored pills)
   ============================================================ */
.syl-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.syl-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  border: 1.5px solid transparent;
  transition: transform 0.1s;
}

.syl-box:active { transform: scale(0.96); }

.syl-box.tone-1 { background: var(--tone-1-bg); color: var(--tone-1); border-color: var(--tone-1); }
.syl-box.tone-2 { background: var(--tone-2-bg); color: var(--tone-2); border-color: var(--tone-2); }
.syl-box.tone-3 { background: var(--tone-3-bg); color: var(--tone-3); border-color: var(--tone-3); }
.syl-box.tone-4 { background: var(--tone-4-bg); color: var(--tone-4); border-color: var(--tone-4); }
.syl-box.tone-5 { background: var(--tone-5-bg); color: var(--tone-5); border-color: var(--tone-5); }

.syl-box.hidden {
  color: transparent;
  background: var(--tone-5-bg);
  border-color: var(--border-strong);
  border-style: dashed;
}

/* Split syllable: [initial | final] */
.syl-box.split {
  padding: 6px 4px;
  gap: 2px;
}

.syl-split-init {
  padding: 0 6px;
  border-right: 1px solid currentColor;
  opacity: 0.7;
}

.syl-split-final {
  padding: 0 6px;
  font-weight: 600;
}

/* ============================================================
   Word detail sheet
   ============================================================ */
.word-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 0.5px solid var(--border);
  cursor: pointer;
  min-height: 60px;
}

.word-row:hover { background: var(--tone-5-bg); }

.word-char {
  font-size: 28px;
  font-weight: 500;
  min-width: 60px;
  flex-shrink: 0;
}

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

.word-pinyin-row {
  display: flex;
  gap: 4px;
  margin-bottom: 2px;
}

.word-meaning {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.word-acc {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 10px;
  flex-shrink: 0;
}
.word-acc.good { background: #E8F5E9; color: #2E7D32; }
.word-acc.mid  { background: #FFF3E0; color: #E65100; }
.word-acc.low  { background: #FFEBEE; color: #C62828; }

.word-play {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 12px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  transition: all 0.1s;
}
.word-play:hover { background: var(--text); color: var(--bg); border-color: var(--text); }
.word-play:active { transform: scale(0.95); }

.example-sentence {
  padding: 10px 12px;
  margin-top: 8px;
  background: var(--tone-5-bg);
  border-radius: 8px;
  border-left: 3px solid var(--border-strong);
}
.ex-zh { font-size: 18px; font-weight: 500; margin-bottom: 2px; }
.ex-pinyin { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; font-family: ui-monospace, monospace; }
.ex-meaning { font-size: 13px; color: var(--text); }

/* Search bar */
.search-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.search-input {
  flex: 1;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-size: 15px;
  color: var(--text);
  font-family: inherit;
  outline: none;
  min-height: 44px;
}

.search-input:focus { border-color: var(--text); }

/* ============================================================
   Detail sheet (modal slide-up)
   ============================================================ */
.sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  animation: fadeIn 0.2s ease;
}

.sheet {
  background: var(--bg);
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  border-radius: 16px 16px 0 0;
  padding: 24px 20px;
  max-height: 85vh;
  overflow-y: auto;
  animation: slideUp 0.25s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }

.sheet-close {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--tone-5-bg);
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--text);
  min-height: 44px;
  min-width: 44px;
}

.sheet-char {
  font-size: 72px;
  text-align: center;
  margin: 12px 0;
  font-weight: 500;
}

.sheet-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  margin-top: 18px;
}

/* ============================================================
   Drill shared styles
   ============================================================ */
.drill-container {
  padding-top: 8px;
}

.drill-back {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  padding: 8px 0;
  margin-bottom: 8px;
  font-family: inherit;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.drill-back:hover { color: var(--text); }

.drill-title {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 4px;
}

.drill-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.drill-main {
  background: var(--surface);
  border: 0.5px solid var(--border);
  border-radius: 12px;
  padding: 32px 20px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.drill-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}

.drill-option {
  min-height: 64px;
  background: var(--surface);
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.1s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 12px;
}

.drill-option:active { transform: scale(0.98); }
.drill-option:hover { border-color: var(--text); }

.drill-option.tone-1 { border-color: var(--tone-1); color: var(--tone-1); }
.drill-option.tone-2 { border-color: var(--tone-2); color: var(--tone-2); }
.drill-option.tone-3 { border-color: var(--tone-3); color: var(--tone-3); }
.drill-option.tone-4 { border-color: var(--tone-4); color: var(--tone-4); }

.drill-option.correct {
  background: #E8F5E9 !important;
  border-color: #2E7D32 !important;
  color: #2E7D32 !important;
}

.drill-option.incorrect {
  background: #FFEBEE !important;
  border-color: #C62828 !important;
  color: #C62828 !important;
  opacity: 0.7;
}

.drill-option .opt-label {
  font-size: 20px;
  font-weight: 500;
}

.drill-option .opt-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.drill-option.tone-1 .opt-desc,
.drill-option.tone-2 .opt-desc,
.drill-option.tone-3 .opt-desc,
.drill-option.tone-4 .opt-desc { opacity: 0.8; }

/* Play button (large audio trigger) */
.play-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  border: none;
  font-size: 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s;
  min-height: 80px;
  min-width: 80px;
}

.play-btn:active { transform: scale(0.94); }
.play-btn.playing { animation: pulse 0.6s ease; }

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.play-btn-sm {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  border: none;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
}

.drill-counter {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* Audio-only prompt (no text visible) */
.audio-prompt {
  text-align: center;
  margin-bottom: 24px;
}

.audio-prompt .tip {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 14px;
}

.reveal {
  margin-top: 20px;
  padding: 14px;
  background: var(--tone-5-bg);
  border-radius: 8px;
  text-align: center;
}

/* ============================================================
   Settings
   ============================================================ */
.setting-group {
  margin-bottom: 24px;
}

.setting-label {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

.setting-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.setting-choices {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.choice-btn {
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-size: 13px;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  min-height: 44px;
}

.choice-btn.active {
  border-color: var(--text);
  background: var(--tone-5-bg);
  font-weight: 500;
}

/* ============================================================
   Font toggles (Settings)
   ============================================================ */
.font-toggles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.font-toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: all 0.15s;
  min-height: 56px;
}

.font-toggle input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
}

.font-toggle.off {
  opacity: 0.45;
  background: var(--tone-5-bg);
}

.font-toggle.on {
  border-color: var(--text);
}

.ft-sample {
  font-size: 28px;
  min-width: 80px;
  text-align: center;
  line-height: 1;
}

.ft-label {
  font-size: 12px;
  color: var(--text-muted);
  flex: 1;
}

/* ============================================================
   Hanzi Writer target
   ============================================================ */
.hanzi-target {
  width: 220px;
  height: 220px;
  margin: 0 auto;
}

/* ============================================================
   Lesson list
   ============================================================ */
.pack-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.pack-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 12px;
  background: var(--surface);
  border: 0.5px solid var(--border-strong);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.15s;
  min-height: 64px;
}

.pack-card:hover { border-color: var(--text); }

.pack-actions { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.btn-drill { padding: 12px 16px; background: var(--text); color: var(--bg); border: none; border-radius: 8px; font-size: 14px; font-weight: 500; cursor: pointer; font-family: inherit; min-height: 44px; flex: 1; min-width: 200px; transition: opacity 0.15s; }
.btn-drill:hover { opacity: 0.88; }
.btn-drill:active { transform: scale(0.98); }

.pack-icon {
  font-size: 26px;
  flex-shrink: 0;
}

.pack-info { min-width: 0; }

.pack-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}

.pack-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================================================
   Utility
   ============================================================ */
.spacer { flex: 1; }
.hidden { display: none !important; }
.row { display: flex; gap: 8px; align-items: center; }
.col { display: flex; flex-direction: column; gap: 8px; }

/* Words overflow notice */
.words-overflow { padding: 20px; text-align: center; color: var(--text-muted); font-size: 13px; }

/* ============================================================
   Word Spotter drill styles
   ============================================================ */
.spotter-stage { position: relative; height: 280px; background: var(--surface); border: 0.5px solid var(--border); border-radius: 12px; overflow: hidden; }
.spotter-word { position: absolute; font-weight: 500; color: var(--text); user-select: none; transition: opacity 0.2s; white-space: nowrap; text-align: center; line-height: 1; }
.ws-pinyin-row { display: flex; gap: 4px; justify-content: center; margin-top: 6px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; transform: rotate(0deg); }
.ws-pinyin-box { padding: 2px 6px; border-radius: 4px; font-weight: 500; line-height: 1.2; }
.ws-pinyin-box.tone-1 { color: var(--tone-1); background: var(--tone-1-bg); }
.ws-pinyin-box.tone-2 { color: var(--tone-2); background: var(--tone-2-bg); }
.ws-pinyin-box.tone-3 { color: var(--tone-3); background: var(--tone-3-bg); }
.ws-pinyin-box.tone-4 { color: var(--tone-4); background: var(--tone-4-bg); }
.ws-pinyin-box.tone-5 { color: var(--tone-5); background: var(--tone-5-bg); }
.ws-opt { min-height: 56px; font-size: 14px !important; line-height: 1.4; padding: 12px 14px !important; text-align: left !important; }

/* ============================================================
   Type It drill styles
   ============================================================ */
.ti-meaning { font-size: 22px; font-weight: 500; text-align: center; margin-bottom: 8px; }
.ti-hint { font-size: 12px; color: var(--text-muted); text-align: center; margin-bottom: 20px; }
.ti-input-row { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.ti-input { flex: 1; padding: 14px 16px; border: 2px solid var(--border-strong); border-radius: 8px; font-size: 20px; font-family: ui-monospace, monospace; min-height: 50px; outline: none; background: var(--surface); color: var(--text); letter-spacing: 1px; }
.ti-input:focus { border-color: var(--text); }
.ti-clear { width: 44px; height: 50px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--surface); font-size: 20px; cursor: pointer; color: var(--text-muted); }
.ti-candidates { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; min-height: 60px; }
.ti-cand { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 10px 8px; border: 1.5px solid var(--border-strong); border-radius: 8px; background: var(--surface); cursor: pointer; min-height: 56px; font-family: inherit; color: var(--text); transition: all 0.1s; }
.ti-cand:hover { border-color: var(--text); }
.ti-cand:active { transform: scale(0.97); }
.ti-cand.correct { background: #E8F5E9 !important; border-color: #2E7D32 !important; }
.ti-cand.incorrect { background: #FFEBEE !important; border-color: #C62828 !important; opacity: 0.7; }
.ti-cand-char { font-size: 22px; font-weight: 500; }
.ti-cand-pinyin { font-size: 11px; color: var(--text-muted); }
.ti-empty { grid-column: 1 / -1; text-align: center; font-size: 12px; color: var(--text-muted); padding: 16px; }

/* ============================================================
   Dictation drill styles
   ============================================================ */
.dict-play-row { display: flex; gap: 12px; justify-content: center; margin-bottom: 10px; }
.dict-slow-btn { background: var(--surface); color: var(--text); border: 2px solid var(--text); font-size: 20px; letter-spacing: -3px; padding-right: 3px; }
.dict-play-caption { text-align: center; margin-bottom: 20px; font-size: 13px; color: var(--text-muted); }
.dict-example { font-family: ui-monospace, monospace; background: var(--tone-5-bg); padding: 1px 6px; border-radius: 4px; font-size: 12px; margin: 0 2px; }
.dict-tones-help { display: flex; gap: 6px; justify-content: center; margin-top: 10px; font-family: ui-monospace, monospace; font-size: 13px; }
.dict-tones-help span { padding: 4px 10px; border-radius: 6px; border: 1.5px solid; font-weight: 600; }
.dict-tones-help .tone-1 { color: var(--tone-1); border-color: var(--tone-1); background: var(--tone-1-bg); }
.dict-tones-help .tone-2 { color: var(--tone-2); border-color: var(--tone-2); background: var(--tone-2-bg); }
.dict-tones-help .tone-3 { color: var(--tone-3); border-color: var(--tone-3); background: var(--tone-3-bg); }
.dict-tones-help .tone-4 { color: var(--tone-4); border-color: var(--tone-4); background: var(--tone-4-bg); }
.dict-check-row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 10px; }
.dict-syl { display: inline-flex; flex-direction: column; align-items: center; padding: 6px 10px; border-radius: 8px; font-size: 22px; font-weight: 500; border: 2px solid; }
.dict-syl.correct { border-color: #2E7D32; background: #E8F5E9; }
.dict-syl.incorrect { border-color: #C62828; background: #FFEBEE; }
.dict-syl small { font-size: 10px; color: var(--text-muted); margin-top: 2px; }
.dict-meaning { text-align: center; font-size: 14px; color: var(--text-muted); margin: 8px 0 6px; }
.dict-grade { text-align: center; font-size: 14px; font-weight: 500; padding: 6px; border-radius: 6px; }
.dict-grade.good { color: #2E7D32; }
.dict-grade.bad { color: #C62828; }

/* ============================================================
   Syllable Build drill styles
   ============================================================ */
.sb-row { margin-bottom: 14px; }
.sb-label { font-size: 11px; font-weight: 500; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.sb-options { display: flex; gap: 6px; flex-wrap: wrap; }
.sb-opt { min-width: 48px; min-height: 44px; padding: 8px 12px; background: var(--surface); border: 1.5px solid var(--border-strong); border-radius: 8px; font-size: 15px; font-weight: 500; cursor: pointer; font-family: inherit; color: var(--text); transition: all 0.1s; }
.sb-opt:active { transform: scale(0.96); }
.sb-opt:hover { border-color: var(--text); }
.sb-opt.picked { background: var(--tone-5-bg); border-color: var(--text); font-weight: 600; }
.sb-opt.correct { background: #E8F5E9 !important; border-color: #2E7D32 !important; color: #2E7D32 !important; }
.sb-opt.incorrect { background: #FFEBEE !important; border-color: #C62828 !important; color: #C62828 !important; opacity: 0.7; }
.sb-opt.sb-tone.tone-1 { color: var(--tone-1); }
.sb-opt.sb-tone.tone-2 { color: var(--tone-2); }
.sb-opt.sb-tone.tone-3 { color: var(--tone-3); }
.sb-opt.sb-tone.tone-4 { color: var(--tone-4); }
.sb-opt.sb-tone.picked.tone-1 { background: var(--tone-1-bg); border-color: var(--tone-1); }
.sb-opt.sb-tone.picked.tone-2 { background: var(--tone-2-bg); border-color: var(--tone-2); }
.sb-opt.sb-tone.picked.tone-3 { background: var(--tone-3-bg); border-color: var(--tone-3); }
.sb-opt.sb-tone.picked.tone-4 { background: var(--tone-4-bg); border-color: var(--tone-4); }

/* ============================================================
   Mobile (≤480px) tweaks
   ============================================================ */
@media (max-width: 480px) {
  #app { padding: 16px 12px; }
  .page-title { font-size: 20px; margin-bottom: 14px; }
  .page-subtitle { font-size: 13px; margin-bottom: 16px; }

  /* Tool cards: tighter grid */
  .tools-grid { gap: 10px; }
  .tool-card { min-height: 100px; padding: 16px 12px; }
  .tool-card .tool-name { font-size: 15px; }
  .tool-card .tool-desc { font-size: 11px; }

  /* Word rows: tighter, char smaller */
  .word-row { padding: 12px 10px; gap: 10px; min-height: 64px; }
  .word-char { font-size: 24px; min-width: 44px; }
  .word-info { min-width: 0; }
  .word-meaning { font-size: 12px; }
  .word-play { width: 44px; min-width: 44px; height: 44px; min-height: 44px; }
  .word-acc { font-size: 10px; padding: 2px 6px; }

  /* Drill options: stay 2-col but tighter */
  .drill-options { gap: 8px; }
  .drill-option { min-height: 56px; font-size: 14px; padding: 10px; }
  .drill-option .opt-label { font-size: 18px; }
  .drill-option .opt-desc { font-size: 10px; }

  /* Play button slightly smaller on mobile */
  .play-btn { width: 68px; height: 68px; font-size: 24px; }

  /* Spotter stage: shorter on mobile */
  .spotter-stage { height: 220px; }

  /* Drill main padding */
  .drill-main { padding: 20px 14px; }
  .drill-title { font-size: 18px; }

  /* Tab nav: tighter */
  #tabs .tab { font-size: 13px; }

  /* Sheet takes full screen on mobile */
  .sheet {
    border-radius: 12px 12px 0 0;
    padding: 20px 16px;
    max-height: 92vh;
  }
  .sheet-char { font-size: 60px; }

  /* Settings choices wrap better */
  .setting-choices { gap: 6px; }
  .choice-btn { padding: 10px 12px; font-size: 13px; }

  /* Font toggles: compact */
  .font-toggle { padding: 8px 10px; gap: 10px; min-height: 52px; }
  .ft-sample { font-size: 24px; min-width: 60px; }
  .ft-label { font-size: 11px; }

  /* Syllable boxes: slightly smaller */
  .syl-box { min-width: 44px; min-height: 44px; padding: 6px 10px; font-size: 16px; }

  /* Words search bar: comfortable */
  .search-input { font-size: 16px; /* prevents iOS zoom */ }

  /* Tone drill buttons on small screens */
  .tone-options { gap: 8px; }
  .tone-btn { padding: 12px 10px; }
  .tone-btn .tone-number { font-size: 22px; }
  .tone-btn .tone-desc { font-size: 10px; }
}

/* Very small screens (≤360px) */
@media (max-width: 360px) {
  .tool-card .tool-desc { display: none; }  /* hide descriptions, save space */
  .word-char { font-size: 22px; }
  .drill-option { min-height: 52px; }
}