/* Gujarati Kids - shared stylesheet / design system.
   Touch-first: works at phone width (~390px) through iPad (~1024px) and desktop.
   Fun but not babyish: clean type, confident color, generous tap targets. */

:root {
  color-scheme: light;

  --color-bg: #f5f3ff;
  --color-surface: #ffffff;
  --color-surface-2: #f1effa;
  --color-text: #1f2430;
  --color-text-muted: #5b6475;
  --color-primary: #6d28d9;
  --color-primary-dark: #5321ad;
  --color-primary-contrast: #ffffff;
  --color-secondary: #e5e7eb;
  --color-secondary-text: #1f2430;
  --color-border: #e0def4;
  --color-success: #15803d;
  --color-success-bg: #dcfce7;
  --color-danger: #c0152f;
  --color-danger-bg: #fde8ea;
  --color-warning: #b45309;
  --color-warning-bg: #fef3c7;
  --color-star: #f59e0b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 10px 30px rgba(31, 36, 48, 0.08);
  --shadow-pop: 0 16px 40px rgba(31, 36, 48, 0.18);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --tap-target: 56px;
  --topbar-h: 56px;

  --font-ui: 'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-gu: 'Noto Sans Gujarati', var(--font-ui);
}

@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/NotoSans-Regular.woff2') format('woff2');
}

@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/NotoSans-Bold.woff2') format('woff2');
}

@font-face {
  font-family: 'Noto Sans Gujarati';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/NotoSansGujarati-Regular.woff2') format('woff2');
}

@font-face {
  font-family: 'Noto Sans Gujarati';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/NotoSansGujarati-Bold.woff2') format('woff2');
}

* {
  box-sizing: border-box;
}

/* The [hidden] attribute must always win over a class's own `display`
   rule (equal specificity otherwise lets the class rule take over, e.g.
   a toggled .games-submenu with `display: grid` staying visible). */
[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

h1, h2, h3 {
  margin: 0 0 0.4em;
  font-weight: 700;
  line-height: 1.2;
}

p {
  margin: 0 0 1em;
  color: var(--color-text-muted);
}

button, input, select {
  font-family: inherit;
}

:lang(gu), .gu {
  font-family: var(--font-gu);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- App shell ---------- */

#app-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  height: var(--topbar-h);
  padding: 0 var(--space-3);
  padding-top: env(safe-area-inset-top, 0px);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.topbar-title {
  flex: 1;
  text-align: center;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-icon-btn {
  min-width: 44px;
  min-height: 44px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  font-size: 1.3rem;
  cursor: pointer;
  touch-action: manipulation;
}

.topbar-icon-btn:active {
  background: var(--color-secondary);
}

.screen {
  min-height: calc(100vh - var(--topbar-h));
  padding: var(--space-4);
  padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  max-width: 1024px;
  margin: 0 auto;
  animation: screen-fade-in 0.22s ease both;
}

@keyframes screen-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap-target);
  padding: 0 20px;
  border-radius: var(--radius-md);
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.05s ease, opacity 0.15s ease, background 0.15s ease;
  background: var(--color-secondary);
  color: var(--color-secondary-text);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-block { width: 100%; }
.btn-sm { min-height: 40px; padding: 0 14px; font-size: 0.9rem; }

.btn-primary { background: var(--color-primary); color: var(--color-primary-contrast); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-secondary { background: var(--color-secondary); color: var(--color-secondary-text); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-success { background: var(--color-success); color: #fff; }

.icon-btn {
  min-width: var(--tap-target);
  min-height: var(--tap-target);
  border-radius: 50%;
  border: none;
  background: var(--color-surface-2);
  font-size: 1.4rem;
  cursor: pointer;
  touch-action: manipulation;
}

/* ---------- Login page (task 01) ---------- */

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  padding-top: calc(24px + env(safe-area-inset-top, 0px));
  padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  min-height: 100vh;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
}

.login-title { font-size: 1.9rem; text-align: center; color: var(--color-primary); }
.login-subtitle { text-align: center; margin-bottom: 1.5em; }

#login-form label { display: block; font-weight: 600; margin-bottom: 6px; }

#login-form input[type='password'] {
  width: 100%;
  min-height: var(--tap-target);
  padding: 0 14px;
  margin-bottom: 18px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  background: var(--color-surface);
  color: var(--color-text);
}

#login-form input[type='password']:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font-weight: 500;
  cursor: pointer;
}

.checkbox-row input[type='checkbox'] { width: 24px; height: 24px; }

.form-error {
  min-height: 1.4em;
  color: var(--color-danger);
  font-weight: 600;
  margin-bottom: 10px;
}

.placeholder-screen {
  max-width: 480px;
  margin: 10vh auto 0;
  padding: 0 24px;
  text-align: center;
}
.placeholder-screen h1 { color: var(--color-primary); font-size: 2rem; }

/* ---------- Profiles screen ---------- */

.profiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.profile-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  touch-action: manipulation;
  min-height: var(--tap-target);
}

.profile-card:active { transform: scale(0.98); }
.profile-card .avatar { font-size: 3rem; }
.profile-card .name { font-weight: 700; }

.profile-card.add-player {
  border-style: dashed;
  color: var(--color-text-muted);
  justify-content: center;
}

.avatar-pick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  margin: var(--space-3) 0;
}

.avatar-pick {
  font-size: 1.8rem;
  min-height: 56px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface-2);
  cursor: pointer;
}

.avatar-pick.selected {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

/* ---------- Home screen ---------- */

.home-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
  box-shadow: var(--shadow-card);
}

.home-header .avatar { font-size: 2.2rem; }
.home-header .player-name { font-weight: 700; font-size: 1.1rem; }
.home-header .stat { display: flex; align-items: center; gap: 4px; font-weight: 600; color: var(--color-text-muted); }
.home-header .spacer { flex: 1; }

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-4);
}

.home-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 120px;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  cursor: pointer;
  touch-action: manipulation;
  text-align: left;
}

.home-tile:active { transform: scale(0.98); }
.home-tile .tile-icon { font-size: 2rem; }
.home-tile .tile-label { font-weight: 700; }
.home-tile.disabled { opacity: 0.55; cursor: not-allowed; }
.home-tile .tile-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-surface-2);
  border-radius: 999px;
  padding: 2px 8px;
}

.games-submenu {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

/* ---------- Letter picker ---------- */

.letters-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.letters-count {
  position: sticky;
  bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-pop);
  margin-top: var(--space-5);
}

.letter-group { margin-bottom: var(--space-5); }

.letter-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.letter-group-header h3 { margin: 0; }

.letter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  gap: var(--space-2);
}

.letter-chip {
  position: relative;
  min-height: 72px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-gu);
  font-size: 1.8rem;
  cursor: pointer;
  touch-action: manipulation;
}

.letter-chip.selected {
  border-color: var(--color-primary);
  background: #f1e9fd;
  color: var(--color-primary-dark);
}

.letter-chip .mastery-ring {
  position: absolute;
  inset: -3px;
  border-radius: var(--radius-md);
  border: 3px solid var(--color-star);
  pointer-events: none;
}

/* Two-line variant: big Gujarati glyph + its English spelling underneath,
   so visually similar letters (e.g. ઘ gha vs ધ dha) are easy to tell apart. */
.letter-chip-labeled {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 4px;
}

.letter-chip-labeled .chip-char {
  font-size: 1.7rem;
  line-height: 1;
}

.letter-chip-labeled .chip-translit {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: lowercase;
}

.letter-chip-labeled.selected .chip-translit {
  color: var(--color-primary-dark);
}

.accuracy-badge {
  position: absolute;
  bottom: -6px;
  right: -6px;
  font-family: var(--font-ui);
  font-size: 0.62rem;
  font-weight: 700;
  color: #fff;
  border-radius: 999px;
  padding: 1px 5px;
  line-height: 1.4;
}

.accuracy-badge-weak { background: var(--color-danger); }
.accuracy-badge-ok { background: var(--color-warning); }
.accuracy-badge-good { background: var(--color-success); }

/* ---------- Learn screen ---------- */

.learn-carousel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.learn-card {
  width: 100%;
  max-width: 360px;
  min-height: 420px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
}

.learn-card .big-letter {
  font-family: var(--font-gu);
  font-size: 7rem;
  line-height: 1;
  color: var(--color-primary);
  cursor: pointer;
  touch-action: manipulation;
}

.learn-card .translit { color: var(--color-text-muted); font-size: 1.2rem; }

.learn-card .word-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1.4rem;
  cursor: pointer;
  touch-action: manipulation;
  margin-top: var(--space-3);
}

.learn-card .word-emoji { font-size: 2rem; }
.learn-card .word-text { font-family: var(--font-gu); }
.learn-card .word-meaning { color: var(--color-text-muted); font-size: 1rem; }

.learn-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.learn-progress {
  color: var(--color-text-muted);
  font-weight: 600;
}

.learn-progress-bar {
  width: 100%;
  max-width: 360px;
  height: 8px;
  background: var(--color-surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.learn-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 0.25s ease;
}

.knowledge-pill {
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 3px 12px;
  margin-top: 4px;
}

.knowledge-pill-unseen { background: var(--color-surface-2); color: var(--color-text-muted); }
.knowledge-pill-weak { background: var(--color-danger-bg); color: var(--color-danger); }
.knowledge-pill-ok { background: var(--color-warning-bg); color: var(--color-warning); }
.knowledge-pill-good { background: var(--color-success-bg); color: var(--color-success); }

.mic-btn.listening {
  animation: mic-pulse 1s ease-in-out infinite;
}

@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(109, 40, 217, 0.35); }
  50% { box-shadow: 0 0 0 10px rgba(109, 40, 217, 0); }
}

.trace-overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(20, 16, 36, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.trace-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  max-width: 100%;
}

.trace-canvas {
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
}

.trace-actions { display: flex; gap: var(--space-3); }

/* ---------- Generic game board utilities ---------- */

.game-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.game-header .spacer { flex: 1; }

.score-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  background: var(--color-surface-2);
  border-radius: 999px;
  padding: var(--space-2) var(--space-4);
}

.score-bar-label { color: var(--color-text-muted); font-weight: 600; }

.game-board,
.setup-card {
  touch-action: manipulation;
  user-select: none;
  -webkit-touch-callout: none;
  overscroll-behavior: none;
}

.setup-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.setup-row { display: flex; flex-direction: column; gap: var(--space-2); }
.setup-row label { font-weight: 700; }

.segmented {
  display: flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--color-border);
}

.segmented button {
  flex: 1;
  min-height: 48px;
  border: none;
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 600;
}

.segmented button.active { background: var(--color-primary); color: #fff; }

/* ---------- Bingo ---------- */

.bingo-grid {
  display: grid;
  gap: var(--space-2);
  max-width: 480px;
  margin: 0 auto;
}

.bingo-cell {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-gu);
  font-size: 1.6rem;
  cursor: pointer;
  touch-action: manipulation;
}

.bingo-cell.called { border-color: var(--color-primary); }
.bingo-cell.marked { background: var(--color-success-bg); border-color: var(--color-success); color: var(--color-success); }
.bingo-cell.free { background: var(--color-surface-2); color: var(--color-text-muted); font-size: 1rem; }
.bingo-cell.wrong-flash { animation: bingo-wrong-flash 0.4s ease; }

@keyframes bingo-wrong-flash {
  0%, 100% { background: var(--color-surface); }
  50% { background: var(--color-danger-bg); }
}

.caller-banner {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  text-align: center;
  margin-bottom: var(--space-4);
}

.caller-banner .caller-letter { font-family: var(--font-gu); font-size: 4rem; color: var(--color-primary); }
.caller-banner.classroom .caller-letter { font-size: 8rem; }

.called-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-3) 0;
}

.called-chip {
  font-family: var(--font-gu);
  font-size: 1.2rem;
  background: var(--color-surface-2);
  border-radius: 999px;
  padding: 4px 12px;
}

.print-cards-page { display: none; }

@media print {
  body > *:not(.print-cards-page) { display: none !important; }
  .print-cards-page {
    display: block !important;
    background: #fff;
    color: #000;
  }
  .print-card {
    page-break-after: always;
  }
}

.print-card .bingo-grid { margin-top: var(--space-4); }

/* ---------- Memory Match ---------- */

.memory-grid {
  display: grid;
  gap: var(--space-2);
  max-width: 560px;
  margin: 0 auto;
}

.memory-card {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: var(--radius-md);
  cursor: pointer;
  touch-action: manipulation;
  perspective: 600px;
}

.memory-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.4s;
  transform-style: preserve-3d;
}

.memory-card.flipped .memory-card-inner,
.memory-card.matched .memory-card-inner {
  transform: rotateY(180deg);
}

.memory-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: var(--radius-md);
  backface-visibility: hidden;
  padding: 4px;
  overflow: hidden;
}

.memory-face-back {
  background: var(--color-primary);
  color: #fff;
  font-size: 1.6rem;
}

.memory-face-front {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  transform: rotateY(180deg);
  font-size: 1.1rem;
  flex-direction: column;
  gap: 2px;
}

.memory-face-front .gu { font-size: 1.8rem; }
.memory-card.matched .memory-face-front { border-color: var(--color-success); background: var(--color-success-bg); }

/* ---------- Word Search ---------- */

.wordsearch-layout {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  align-items: flex-start;
  justify-content: center;
}

.wordsearch-grid {
  display: grid;
  gap: 2px;
  background: var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  touch-action: none;
  user-select: none;
  width: min(100%, 480px);
}

.wordsearch-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  font-family: var(--font-gu);
  font-size: clamp(0.7rem, 2.6vw, 1.1rem);
  cursor: pointer;
}

.wordsearch-cell.selecting { background: var(--color-warning-bg); }
.wordsearch-cell.found { color: #fff; }

.wordsearch-wordlist {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 220px;
  flex: 1;
}

.wordsearch-wordlist li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.wordsearch-wordlist li.found { color: var(--color-success); text-decoration: line-through; }
.wordsearch-wordlist .ws-emoji { font-size: 1.4rem; }
.wordsearch-wordlist .ws-gu { font-family: var(--font-gu); font-weight: 700; }

/* ---------- Balloon Pop ---------- */

.balloon-board {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 60vh;
  max-height: 560px;
  margin: 0 auto;
  background: linear-gradient(to top, #bfe3ff, #eef7ff);
  border-radius: var(--radius-lg);
  overflow: hidden;
  touch-action: none;
}

@media (prefers-color-scheme: dark) {
  .balloon-board { background: linear-gradient(to top, #1e2a44, #141226); }
}

.balloon {
  position: absolute;
  width: 72px;
  height: 88px;
  border-radius: 50% 50% 50% 50% / 55% 55% 45% 45%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-gu);
  font-size: 1.6rem;
  color: #fff;
  cursor: pointer;
  touch-action: manipulation;
  box-shadow: inset -6px -6px 12px rgba(0, 0, 0, 0.15);
}

.balloon-prompt {
  text-align: center;
  margin-bottom: var(--space-3);
}

.balloon-prompt .prompt-letter { font-family: var(--font-gu); font-size: 2.4rem; color: var(--color-primary); }

/* ---------- Word Builder ---------- */

.wb-tiles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin: var(--space-4) 0;
}

.wb-tile {
  min-width: 56px;
  min-height: 56px;
  font-family: var(--font-gu);
  font-size: 1.6rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  touch-action: manipulation;
}

.wb-tile:disabled { opacity: 0.3; cursor: not-allowed; }

.wb-answer {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  min-height: 64px;
  margin-bottom: var(--space-3);
}

.wb-answer-slot {
  min-width: 56px;
  min-height: 56px;
  font-family: var(--font-gu);
  font-size: 1.6rem;
  border-radius: var(--radius-md);
  border: 2px dashed var(--color-border);
  background: var(--color-surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* The correct spelling, revealed after a wrong Check. */
.wb-answer-slot-reveal {
  border: 2px solid var(--color-warning);
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

/* ---------- Leaderboard ---------- */

.leaderboard-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-3);
  max-width: 560px;
  margin: var(--space-4) auto 0;
}

.leaderboard-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.leaderboard-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
}

.leaderboard-row:nth-child(odd) {
  background: var(--color-surface-2);
}

.leaderboard-row-me {
  border-color: var(--color-primary);
  background: #f1e9fd;
}

@media (prefers-color-scheme: dark) {
  .leaderboard-row-me {
    background: color-mix(in srgb, var(--color-primary) 18%, var(--color-surface));
  }
}

.leaderboard-rank {
  width: 32px;
  flex: 0 0 auto;
  text-align: center;
  font-weight: 800;
  color: var(--color-text-muted);
}

.leaderboard-rank-1,
.leaderboard-rank-2,
.leaderboard-rank-3 {
  font-size: 1.4rem;
}

.leaderboard-avatar {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.leaderboard-row-me .leaderboard-avatar {
  background: var(--color-primary);
}

.leaderboard-name-col {
  flex: 1;
  min-width: 0;
}

.leaderboard-name {
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.leaderboard-you-pill {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--color-primary-contrast);
  background: var(--color-primary);
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: middle;
}

.leaderboard-date {
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.leaderboard-score {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-primary);
  flex: 0 0 auto;
  min-width: 48px;
  text-align: right;
}

.leaderboard-empty {
  text-align: center;
  padding: var(--space-5);
}

.leaderboard-empty .big-emoji {
  font-size: 2.5rem;
  display: block;
  margin-bottom: var(--space-2);
}

/* ---------- Modal / Toast / Confetti ---------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(20, 16, 36, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  max-width: 420px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-pop);
}

.modal-title { color: var(--color-primary); }
.modal-actions { display: flex; gap: var(--space-3); margin-top: var(--space-4); flex-wrap: wrap; }
.modal-actions .btn { flex: 1; min-width: 120px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 20px);
  background: var(--color-text);
  color: #fff;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 50;
  max-width: 90vw;
  text-align: center;
}

.toast-visible { opacity: 1; transform: translate(-50%, 0); }

.confetti-host {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 45;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  top: -10px;
  width: 10px;
  height: 14px;
  opacity: 0.9;
  animation-name: confetti-fall;
  animation-timing-function: ease-in;
  animation-fill-mode: forwards;
}

@keyframes confetti-fall {
  to {
    top: 100vh;
    transform: rotate(540deg);
    opacity: 0.2;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 480px) {
  .learn-card { min-height: 360px; padding: var(--space-4); }
  .learn-card .big-letter { font-size: 6rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --color-bg: #15131f;
    --color-surface: #1f1c2c;
    --color-surface-2: #2b2740;
    --color-text: #f1eefc;
    --color-text-muted: #a8a3bf;
    --color-primary: #a78bfa;
    --color-primary-dark: #c4b5fd;
    --color-primary-contrast: #15131f;
    --color-secondary: #2b2740;
    --color-secondary-text: #f1eefc;
    --color-border: #332f4a;
    --color-success: #4ade80;
    --color-success-bg: #123622;
    --color-danger: #ff8099;
    --color-danger-bg: #3a1620;
    --color-warning: #fbbf24;
    --color-warning-bg: #3a2a0f;
  }
}