/* ═══════════════════════════════════════════════════════════════════════════
   Number Trainer v6 — Jony Ive Edition
   Complete CSS — mobile-first, cool blue accent, bottom sheet settings
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── FOUC Prevention ──────────────────────────────────────────────────────── */
html:not([data-theme]) { color-scheme: light dark; }

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

/* ── CSS Custom Properties — Light Theme ───────────────────────────────────── */
:root {
  --color-bg:              #F5F5F7;
  --color-surface:         #FFFFFF;
  --color-text:            #1D1D1F;
  --color-text-secondary:  #86868B;
  --color-primary:         #007AFF;
  --color-primary-hover:   #0051D5;
  --color-primary-bg:      #E5F0FF;
  --color-correct:         #30D158;
  --color-correct-bg:      #D6F5DD;
  --color-wrong:           #FF453A;
  --color-wrong-bg:        #FDDCDA;
  --color-border:          #D2D2D7;
  --color-divider:         #E5E5EA;
  --shadow-sm:   0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg:   0 4px 16px rgba(0,0,0,0.12);
  --shadow-panel: 0 -4px 24px rgba(0,0,0,0.12);
  --color-scrim: rgba(0,0,0,0.3);

  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', system-ui, sans-serif;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);

  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring:  cubic-bezier(0.32, 0.72, 0, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Dark Theme — Auto ─────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:              #000000;
    --color-surface:         #1C1C1E;
    --color-text:            #F5F5F7;
    --color-text-secondary:  #98989D;
    --color-primary:         #0A84FF;
    --color-primary-hover:   #409CFF;
    --color-primary-bg:      #0A2744;
    --color-correct:         #30D158;
    --color-correct-bg:      #0D3318;
    --color-wrong:           #FF453A;
    --color-wrong-bg:        #3A1418;
    --color-border:          #38383A;
    --color-divider:         #2C2C2E;
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.2);
    --shadow-md:   0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg:   0 4px 16px rgba(0,0,0,0.4);
    --shadow-panel: 0 -4px 24px rgba(0,0,0,0.4);
    --color-scrim: rgba(0,0,0,0.5);
  }
}

/* ── Dark Theme — Forced ───────────────────────────────────────────────────── */
[data-theme="dark"] {
  --color-bg:              #000000;
  --color-surface:         #1C1C1E;
  --color-text:            #F5F5F7;
  --color-text-secondary:  #98989D;
  --color-primary:         #0A84FF;
  --color-primary-hover:   #409CFF;
  --color-primary-bg:      #0A2744;
  --color-correct:         #30D158;
  --color-correct-bg:      #0D3318;
  --color-wrong:           #FF453A;
  --color-wrong-bg:        #3A1418;
  --color-border:          #38383A;
  --color-divider:         #2C2C2E;
  --shadow-sm:   0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:   0 2px 8px rgba(0,0,0,0.3);
  --shadow-lg:   0 4px 16px rgba(0,0,0,0.4);
  --shadow-panel: 0 -4px 24px rgba(0,0,0,0.4);
  --color-scrim: rgba(0,0,0,0.5);
}

/* ── Light Theme — Forced ──────────────────────────────────────────────────── */
[data-theme="light"] {
  --color-bg:              #F5F5F7;
  --color-surface:         #FFFFFF;
  --color-text:            #1D1D1F;
  --color-text-secondary:  #86868B;
  --color-primary:         #007AFF;
  --color-primary-hover:   #0051D5;
  --color-primary-bg:      #E5F0FF;
  --color-correct:         #30D158;
  --color-correct-bg:      #D6F5DD;
  --color-wrong:           #FF453A;
  --color-wrong-bg:        #FDDCDA;
  --color-border:          #D2D2D7;
  --color-divider:         #E5E5EA;
  --shadow-sm:   0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg:   0 4px 16px rgba(0,0,0,0.12);
  --shadow-panel: 0 -4px 24px rgba(0,0,0,0.12);
  --color-scrim: rgba(0,0,0,0.3);
}

/* ── Base ──────────────────────────────────────────────────────────────────── */
html {
  font-family: var(--font);
  font-size: 16px;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--color-bg);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--safe-top) 16px var(--safe-bottom);
  transition: filter 2s ease;
}

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  -webkit-appearance: none;
  touch-action: manipulation;
}


/* ══════════════════════════════════════════════════════════════════════════════
   Screens
   ══════════════════════════════════════════════════════════════════════════════ */

.screen {
  display: none;
  width: 100%;
  max-width: 400px;
  flex: 1;
  flex-direction: column;
  padding: 24px 0;
  position: relative;
}

.screen.active {
  display: flex;
  opacity: 1;
  pointer-events: auto;
}


/* ══════════════════════════════════════════════════════════════════════════════
   Screen 1: Language Selection
   ══════════════════════════════════════════════════════════════════════════════ */

.lang-select-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.lang-select-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.lang-select-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.lang-select-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 200px;
}

.lang-select-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 200px;
  height: 56px;
  border-radius: 14px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.lang-select-btn:active { transform: scale(0.96); }
.lang-flag { font-size: 1.25rem; }
.lang-name { font-size: 1.125rem; }


/* ══════════════════════════════════════════════════════════════════════════════
   Screen 2: Onboarding
   ══════════════════════════════════════════════════════════════════════════════ */

.onboarding-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  padding: 24px;
}

.onboarding-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: calc(100% - 48px);
  max-width: 320px;
}

.onboarding-option { width: 100%; }

.onboarding-message {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
  opacity: 0;
  animation: fadeIn 300ms ease-out forwards;
}

.onboarding-message.hidden { display: none; }


/* ══════════════════════════════════════════════════════════════════════════════
   Screen 3: Category Selection (Menu)
   ══════════════════════════════════════════════════════════════════════════════ */

.menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding: 0;
}

.menu-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

/* Settings trigger button */
.settings-trigger {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: color 0.2s ease, background-color 0.2s ease;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.settings-trigger:active {
  transform: scale(0.92);
  background: var(--color-surface);
}

.settings-dot {
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.settings-dot.visible { opacity: 1; }


/* ── Category Grid ─────────────────────────────────────────────────────────── */

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

/* 1 category: centered single card */
.category-grid[data-count="1"] {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
}

.category-grid[data-count="1"] .category-card {
  width: calc(100% - 48px);
  max-width: 320px;
  min-height: 120px;
}

/* 2-3: single column */
.category-grid[data-count="2"],
.category-grid[data-count="3"] {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* 4-6: 2 columns */
.category-grid[data-count="4"],
.category-grid[data-count="5"],
.category-grid[data-count="6"] {
  grid-template-columns: 1fr 1fr;
}

/* ── Category Card ─────────────────────────────────────────────────────────── */

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 14px 8px;
  min-height: 100px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  cursor: pointer;
  transition: transform 0.12s ease, background-color 0.15s ease, border-color 0.15s ease;
  text-align: center;
  -webkit-tap-highlight-color: transparent;
  position: relative;
}

.category-card:active {
  transform: scale(0.96);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.category-card:active .category-card-label,
.category-card:active .category-card-desc,
.category-card:active .category-card-icon { color: #fff; }

.category-card-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 8px;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-card-icon svg { width: 100%; height: 100%; }

.category-card-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: 2px;
}

.category-card-desc {
  font-size: 0.6875rem;
  color: var(--color-text-secondary);
  line-height: 1.2;
}

/* Mixed card — full width, dashed border */
.category-card--mixed {
  grid-column: 1 / -1;
  flex-direction: row;
  gap: 12px;
  justify-content: center;
  min-height: 56px;
  padding: 12px 20px;
  border-style: dashed;
  border-width: 1.5px;
}

.category-card--mixed .category-card-icon { margin-bottom: 0; }

/* Mastery checkmark */
.category-checkmark {
  position: absolute;
  top: 6px;
  right: 6px;
  font-size: 0.625rem;
  color: var(--color-correct);
  font-weight: 700;
}



/* ══════════════════════════════════════════════════════════════════════════════
   Screen 4: Training
   ══════════════════════════════════════════════════════════════════════════════ */

.training-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0 16px;
  gap: 8px;
}

.training-back {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  flex-shrink: 0;
}

.training-back:active { background: var(--color-bg); }

.training-category {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.training-score {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.training-score strong {
  font-weight: 700;
  color: var(--color-text);
}

.training-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding-bottom: 24px;
}

/* ── Play Button ───────────────────────────────────────────────────────────── */

.play-button {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-primary);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin: 32px auto 24px;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease;
  box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
  flex-shrink: 0;
}

.play-button:active {
  transform: scale(0.92);
  background: var(--color-primary-hover);
}

.play-button.playing {
  animation: audioPlay 800ms ease-out;
  box-shadow: 0 0 30px rgba(0, 122, 255, 0.4);
}

.play-button.hidden { display: none; }

/* Pulse on new question */
@keyframes pulse-once {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.06); }
  100% { transform: scale(1); }
}

.play-button.pulse { animation: pulse-once 0.6s var(--ease-default); }

/* Bloom on streak milestone */
.play-button.bloom { animation: bloom 400ms ease-out; }

/* ── Reading Card ──────────────────────────────────────────────────────────── */

.reading-card {
  width: 100%;
  padding: 32px 20px;
  margin: 20px 0 24px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 16px;
  text-align: center;
  flex-shrink: 0;
}

.reading-card.hidden { display: none; }

.reading-card-number {
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  word-break: break-word;
}

/* ── Options Grid ──────────────────────────────────────────────────────────── */

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0 0 16px;
  width: 100%;
}

.option-btn {
  min-height: 64px;
  padding: 18px 12px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 14px;
  font-size: clamp(1rem, 4.5vw, 1.25rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.2s ease, border-color 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  line-height: 1.2;
  overflow-wrap: break-word;
  word-break: break-word;
  font-family: var(--font);
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-btn.long-text {
  font-size: clamp(0.85rem, 3.5vw, 1.05rem);
}

.option-btn:active:not(.correct):not(.wrong):not(:disabled) {
  transform: scale(0.96);
}

.option-btn:disabled { cursor: default; transform: none; }

/* Correct */
.option-btn.correct {
  background: var(--color-correct-bg);
  border-color: var(--color-correct);
  color: var(--color-correct);
  animation: pop-in 0.25s var(--ease-bounce);
}

/* Wrong */
.option-btn.wrong {
  background: var(--color-wrong-bg);
  border-color: var(--color-wrong);
  color: var(--color-wrong);
  animation: shake 0.3s ease;
}

/* Reveal correct after wrong */
.option-btn.reveal-correct {
  background: var(--color-correct-bg);
  border-color: var(--color-correct);
  color: var(--color-correct);
  animation: correctPulse 600ms ease-in-out 2;
}

/* Dimmed */
.option-btn.dimmed {
  opacity: 0.3;
  transition: opacity 200ms ease-out;
}

/* ── Progress Bar ──────────────────────────────────────────────────────────── */

.progress-bar {
  width: 100%;
  height: 3px;
  background: var(--color-divider);
  border-radius: 1.5px;
  overflow: hidden;
  margin-top: auto;
}

.progress-bar__fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 1.5px;
  transition: width 0.4s var(--ease-default);
  will-change: width;
}



/* ══════════════════════════════════════════════════════════════════════════════
   Screen 5: Summary
   ══════════════════════════════════════════════════════════════════════════════ */

.summary-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px 0;
}

.summary-percent {
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.summary-percent--excellent { color: var(--color-correct); }
.summary-percent--good      { color: var(--color-primary); }
.summary-percent--low       { color: var(--color-text); }

/* Legacy compat for JS class names */
.summary-percent.excellent { color: var(--color-correct); }
.summary-percent.good      { color: var(--color-primary); }
.summary-percent.learning  { color: var(--color-text); }

.summary-detail {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.summary-category {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.summary-motivation {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-style: italic;
}

.summary-motivation.hidden { display: none; }

.summary-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 16px;
  margin-top: 32px;
}

@keyframes count-up-bounce {
  0%   { transform: scale(0.8); opacity: 0; }
  60%  { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); }
}

.summary-percent.animate {
  animation: count-up-bounce 0.8s var(--ease-default) forwards;
}


/* ══════════════════════════════════════════════════════════════════════════════
   Buttons
   ══════════════════════════════════════════════════════════════════════════════ */

.btn-primary {
  display: block;
  width: 100%;
  padding: 16px 24px;
  background: var(--color-primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
  text-align: center;
}

.btn-primary:active {
  background: var(--color-primary-hover);
  transform: scale(0.97);
}

.btn-primary.hidden { display: none; }

.btn-secondary {
  display: block;
  width: 100%;
  padding: 14px 24px;
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
  text-align: center;
}

.btn-secondary:active {
  background: var(--color-bg);
  transform: scale(0.97);
}


/* ══════════════════════════════════════════════════════════════════════════════
   Settings Bottom Sheet
   ══════════════════════════════════════════════════════════════════════════════ */

.settings-scrim {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0);
  z-index: 200;
  transition: background-color 0.3s ease;
  pointer-events: none;
}

.settings-scrim.active {
  background: var(--color-scrim);
  pointer-events: auto;
}

.settings-panel {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) translateY(100%);
  width: 100%;
  max-width: 440px;
  max-height: 85vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--color-surface);
  border-radius: 16px 16px 0 0;
  box-shadow: var(--shadow-panel);
  z-index: 201;
  padding: 12px 24px calc(24px + var(--safe-bottom));
  transition: transform 0.35s var(--ease-spring);
  -webkit-overflow-scrolling: touch;
}

.settings-panel.open {
  transform: translateX(-50%) translateY(0);
}

.settings-drag-handle {
  width: 40px;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  margin: 0 auto 16px;
}

.settings-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.settings-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.settings-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-bg);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.settings-section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin: 20px 0 8px;
}

.settings-section-label:first-of-type { margin-top: 12px; }

.settings-divider {
  height: 1px;
  background: var(--color-border);
  margin: 20px 0;
  opacity: 0.5;
}

/* ── Segmented Control ─────────────────────────────────────────────────────── */

.segmented-control {
  display: flex;
  background: var(--color-bg);
  border-radius: 10px;
  padding: 3px;
  gap: 0;
}

.segmented-control__item {
  flex: 1;
  padding: 10px 8px;
  min-height: 40px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  -webkit-tap-highlight-color: transparent;
  font-family: var(--font);
}

.segmented-control__item.active {
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}



/* ══════════════════════════════════════════════════════════════════════════════
   Toast
   ══════════════════════════════════════════════════════════════════════════════ */

.toast {
  position: fixed;
  bottom: calc(24px + var(--safe-bottom));
  left: 16px;
  right: 16px;
  max-width: 400px;
  margin: 0 auto;
  padding: 14px 20px;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: 12px;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s var(--ease-spring);
  pointer-events: none;
  z-index: 300;
  font-family: var(--font);
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ══════════════════════════════════════════════════════════════════════════════
   Utility
   ══════════════════════════════════════════════════════════════════════════════ */

.hidden { display: none !important; }


/* ══════════════════════════════════════════════════════════════════════════════
   Keyframe Animations
   ══════════════════════════════════════════════════════════════════════════════ */

@keyframes audioPlay {
  0%  { transform: scale(1); }
  15% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%      { transform: translateX(-3px); }
  75%      { transform: translateX(3px); }
}

@keyframes pop-in {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.04); }
  100% { transform: scale(1); }
}

@keyframes correctPulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.7; }
}

@keyframes bloom {
  0%   { transform: scale(1); filter: brightness(1); }
  50%  { transform: scale(1.15); filter: brightness(1.2); }
  100% { transform: scale(1); filter: brightness(1); }
}

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


/* ══════════════════════════════════════════════════════════════════════════════
   Responsive
   ══════════════════════════════════════════════════════════════════════════════ */

/* Small (320px) */
@media (max-width: 359px) {
  body { padding-left: 12px; padding-right: 12px; }
  .menu-title { font-size: 1.25rem; }
  .category-grid { gap: 8px; }
  .category-card { padding: 10px 6px; min-height: 88px; }
  .category-card-label { font-size: 0.75rem; }
  .category-card-desc { font-size: 0.625rem; }
  .category-card-icon { width: 28px; height: 28px; }
  .option-btn { min-height: 56px; padding: 14px 8px; }
  .play-button { width: 80px; height: 80px; margin: 24px auto 20px; }
  .summary-percent { font-size: 3.5rem; }
  .settings-panel { padding: 12px 16px calc(24px + var(--safe-bottom)); }
}

/* Large (414px+) */
@media (min-width: 414px) {
  body { padding-left: 20px; padding-right: 20px; }
  .category-grid { gap: 12px; }
  .category-card { padding: 16px 10px; min-height: 108px; }
  .option-btn { min-height: 72px; padding: 20px 14px; }
  .play-button { width: 104px; height: 104px; }
}

/* Tablet / Landscape (768px+) */
@media (min-width: 768px) {
  .screen { max-width: 480px; }
  .settings-panel { max-width: 440px; }
}

/* Landscape */
@media (orientation: landscape) and (max-height: 500px) {
  .play-button { width: 72px; height: 72px; margin: 16px auto; }
  .options-grid { grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .option-btn { min-height: 44px; padding: 10px 8px; }
  .training-area { padding-bottom: 8px; }
  .reading-card { padding: 16px; margin: 12px 0 16px; }
}

/* ── Reduced Motion ────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .play-button { animation: none; }
  .option-btn { animation: none; opacity: 1; transform: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}