/* ── DESIGN TOKENS ──────────────────────────────────────────── */
:root, [data-theme="light"] {
  --color-bg:             #fef9f0;
  --color-surface:        #fff8ee;
  --color-surface-2:      #fffdf8;
  --color-surface-offset: #f5eddc;
  --color-border:         #e8d8b8;
  --color-divider:        #eed9b0;

  --color-text:           #2a1f0e;
  --color-text-muted:     #7a6a50;
  --color-text-faint:     #b5a48a;
  --color-text-inverse:   #fef9f0;

  --color-primary:        #5c3d9e;
  --color-primary-hover:  #4a2e85;
  --color-primary-active: #38206c;
  --color-primary-highlight: #e8e0f5;

  --color-accent:         #f5a623;
  --color-accent-hover:   #e08e0a;
  --color-accent-highlight: #fef3d8;

  --color-card-front:     #ffffff;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 3px rgba(42, 31, 14, 0.08);
  --shadow-md: 0 4px 16px rgba(42, 31, 14, 0.10);
  --shadow-card: 0 8px 32px rgba(92, 61, 158, 0.18);

  --font-body: 'Nunito Sans', 'Segoe UI', sans-serif;
  --font-display: 'Nunito', 'Segoe UI', sans-serif;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(1.75rem,  1.4rem  + 1.2vw,  2.75rem);

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
}

[data-theme="dark"] {
  --color-bg:             #1a1225;
  --color-surface:        #221733;
  --color-surface-2:      #2a1e3e;
  --color-surface-offset: #1f1630;
  --color-border:         #3d2e5a;
  --color-divider:        #32254a;
  --color-text:           #e8dff8;
  --color-text-muted:     #9a88be;
  --color-text-faint:     #6b5a8a;
  --color-text-inverse:   #1a1225;
  --color-primary:        #9b7ee0;
  --color-primary-hover:  #b396f0;
  --color-primary-active: #c9aeff;
  --color-primary-highlight: #2d1f4a;
  --color-accent:         #f5a623;
  --color-accent-hover:   #ffc155;
  --color-accent-highlight: #3d2a0a;
  --color-card-front:     #2a1e3e;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #1a1225; --color-surface: #221733; --color-surface-2: #2a1e3e;
    --color-surface-offset: #1f1630; --color-border: #3d2e5a; --color-divider: #32254a;
    --color-text: #e8dff8; --color-text-muted: #9a88be; --color-text-faint: #6b5a8a;
    --color-text-inverse: #1a1225; --color-primary: #9b7ee0; --color-primary-hover: #b396f0;
    --color-primary-active: #c9aeff; --color-primary-highlight: #2d1f4a;
    --color-accent: #f5a623; --color-card-front: #2a1e3e;
    --shadow-card: 0 8px 32px rgba(0,0,0,0.45);
  }
}

/* ── RESET ───────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
a { color: var(--color-text-muted); text-decoration: none; }
a:hover { color: var(--color-primary); }

/* ── HEADER ─────────────────────────────────── */
.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-base);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.class-badge {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-interactive), color var(--transition-interactive);
}
.theme-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-primary);
}

/* ── SCREENS ─────────────────────────────────── */
.screen { display: none; flex: 1; }
.screen.active { display: flex; flex-direction: column; }

/* ── START SCREEN ────────────────────────────── */
.start-content {
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

/* Hero */
.start-hero { text-align: center; }
.start-icon { font-size: 3rem; line-height: 1; margin-bottom: var(--space-3); }
.start-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-2xl);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.03em;
}
.start-desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* Category selector */
.category-selector-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  flex-wrap: nowrap;
}
.category-selector-header h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  color: var(--color-text);
  white-space: nowrap;
}
.select-actions { display: flex; gap: var(--space-1); flex-shrink: 0; }
.btn-ghost {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-interactive);
}
.btn-ghost:hover {
  background: var(--color-surface-offset);
  color: var(--color-primary);
}

.category-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.cat-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-interactive);
  background: var(--color-surface);
  color: var(--color-text-muted);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.cat-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.cat-toggle.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}
.cat-count {
  font-size: 0.65rem;
  background: var(--color-surface-offset);
  color: var(--color-text-faint);
  border-radius: var(--radius-full);
  padding: 1px 6px;
}
.cat-toggle.selected .cat-count {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Start button */
.btn-start {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-xl);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  width: 100%;
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
  box-shadow: 0 4px 18px rgba(92, 61, 158, 0.35);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn-start:hover { background: var(--color-primary-hover); }
.btn-start:active { transform: scale(0.98); }

/* ── SESSION BAR ─────────────────────────────── */
.session-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
}
.session-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}
#cardCounter {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-primary);
  white-space: nowrap;
  min-width: 52px;
}
.progress-bar {
  flex: 1;
  height: 7px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  width: 0%;
}
.session-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.category-chip {
  background: var(--color-accent-highlight);
  color: var(--color-accent-hover);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.btn-end {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
  -webkit-tap-highlight-color: transparent;
}
.btn-end:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── FLASHCARD STAGE ─────────────────────────── */
.flashcard-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-3);
}
.nav-btn {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
  box-shadow: var(--shadow-sm);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.nav-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}
.nav-btn:active { transform: scale(0.93); }
.nav-btn:disabled { opacity: 0.25; cursor: not-allowed; transform: none; }

.flashcard-wrapper {
  flex: 1;
  min-width: 0;
}
.flashcard {
  width: 100%;
  min-height: 300px;
  border-radius: var(--radius-xl);
  background: var(--color-card-front);
  box-shadow: var(--shadow-card);
  border: 1.5px solid var(--color-border);
  display: flex;
  overflow: hidden;
  animation: cardIn 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes cardIn {
  from { opacity: 0; transform: translateX(36px) scale(0.97); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes cardInReverse {
  from { opacity: 0; transform: translateX(-36px) scale(0.97); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
.flashcard.animate-prev { animation: cardInReverse 0.32s cubic-bezier(0.16, 1, 0.3, 1); }

.flashcard-face {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-8) var(--space-5);
  text-align: center;
}
.word-category {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}
.word-english {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 8vw, 3.5rem);
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: -0.02em;
  word-break: break-word;
}
.speak-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-sm);
  transition: all var(--transition-interactive);
  box-shadow: 0 3px 12px rgba(92, 61, 158, 0.3);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.speak-btn:hover { background: var(--color-primary-hover); }
.speak-btn:active { transform: scale(0.96); }
.speak-btn.speaking {
  background: var(--color-accent);
  animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}
.word-translation {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-muted);
  font-style: italic;
}

/* ── KEYBOARD HINT ───────────────────────────── */
.keyboard-hint {
  text-align: center;
  padding: var(--space-3) var(--space-4) var(--space-5);
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-weight: 600;
}

/* ── FINISH SCREEN ───────────────────────────── */
.finish-content {
  padding: var(--space-12) var(--space-5);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}
.finish-icon { font-size: 4rem; line-height: 1; }
.finish-content h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-2xl);
  color: var(--color-primary);
  letter-spacing: -0.03em;
}
.finish-desc { color: var(--color-text-muted); font-size: var(--text-base); line-height: 1.6; }
.finish-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
}
.btn-home { color: var(--color-text-muted); font-size: var(--text-base); font-weight: 600; }

/* ── FOOTER ─────────────────────────────────── */
.app-footer {
  padding: var(--space-4);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  border-top: 1px solid var(--color-divider);
}

/* ── SWIPE HINT (mobile) ─────────────────────── */
.swipe-hint {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0 var(--space-4) var(--space-4);
}

/* ─────────────────────────────────────────────
   TABLET  ≥ 640px
───────────────────────────────────────────── */
@media (min-width: 640px) {
  .app-header { padding: var(--space-3) var(--space-6); }
  .logo-text { font-size: var(--text-lg); }

  .start-content {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-10) var(--space-6);
    gap: var(--space-10);
  }
  .start-icon { font-size: 4rem; }
  .start-desc { font-size: var(--text-base); }
  .category-selector-header h2 { font-size: var(--text-lg); }

  .btn-ghost { font-size: var(--text-sm); padding: var(--space-2) var(--space-3); }
  .cat-toggle { font-size: var(--text-sm); padding: var(--space-2) var(--space-4); }
  .cat-count { font-size: var(--text-xs); padding: 1px 7px; }

  .session-bar { padding: var(--space-3) var(--space-6); }
  .flashcard-stage {
    padding: var(--space-8) var(--space-5);
    gap: var(--space-5);
  }
  .nav-btn { width: 52px; height: 52px; }
  .flashcard { min-height: 320px; }
  .flashcard-face { padding: var(--space-10) var(--space-8); }
  .keyboard-hint { padding: var(--space-4) var(--space-6) var(--space-8); }

  .finish-content { padding: var(--space-16) var(--space-6); max-width: 460px; margin: 0 auto; }
}

/* ─────────────────────────────────────────────
   DESKTOP  ≥ 960px
───────────────────────────────────────────── */
@media (min-width: 960px) {
  .start-content { max-width: 700px; }
  .header-inner { max-width: 900px; margin: 0 auto; }
  .session-bar .session-info,
  .session-bar .session-meta { max-width: 900px; margin-left: auto; margin-right: auto; }
  .flashcard-stage {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    gap: var(--space-6);
    padding: var(--space-8) var(--space-6);
  }
  .nav-btn { width: 56px; height: 56px; }
  .nav-btn:hover { transform: scale(1.08); }
  .flashcard { min-height: 340px; }
  .flashcard-wrapper { max-width: 560px; }
  .keyboard-hint { gap: var(--space-6); }
}

/* ═══════════════════════════════════════════════
   QUIZ
═══════════════════════════════════════════════ */
.quiz-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
}
.quiz-bar-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.quiz-progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.quiz-label-text {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
#quizCounter {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Stage */
.quiz-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-5) var(--space-4) var(--space-6);
  overflow-y: auto;
}

/* Card */
.quiz-card {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  max-width: 500px;
  animation: cardIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.quiz-card.active { display: flex; }

/* Badge */
.quiz-type-badge {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}
.quiz-badge-listen {
  background: var(--color-accent-highlight);
  color: var(--color-accent-hover);
}
.quiz-badge-write {
  background: var(--color-success-highlight, #d4f0d0);
  color: var(--color-success, #2e7d20);
}

/* Word display */
.quiz-word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 7vw, 3rem);
  color: var(--color-text);
  text-align: center;
  letter-spacing: -0.02em;
  line-height: 1.1;
  word-break: break-word;
}

/* Small speak button */
.quiz-speak-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-offset);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
  -webkit-tap-highlight-color: transparent;
}
.quiz-speak-btn:hover {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Big speak button (type B) */
.quiz-listen-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) 0 var(--space-2);
}
.quiz-big-speak {
  width: 88px;
  height: 88px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(92, 61, 158, 0.38);
  transition: all var(--transition-interactive);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.quiz-big-speak:hover {
  background: var(--color-primary-hover);
  transform: scale(1.06);
  box-shadow: 0 8px 30px rgba(92, 61, 158, 0.5);
}
.quiz-big-speak:active { transform: scale(0.95); }
.quiz-big-speak.speaking {
  background: var(--color-accent);
  animation: pulse 0.9s ease-in-out infinite;
}
.quiz-listen-hint {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Options grid */
.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  width: 100%;
}
.quiz-option {
  padding: var(--space-4) var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-interactive);
  line-height: 1.3;
  word-break: break-word;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  transform: translateY(-1px);
}
.quiz-option:active:not(:disabled) { transform: scale(0.97); }
.quiz-option.correct {
  border-color: var(--color-success, #3a8a2e) !important;
  background: var(--color-success-highlight, #d4f0d0) !important;
  color: var(--color-success, #2e7d20) !important;
}
.quiz-option.wrong {
  border-color: #c0392b !important;
  background: #fde8e6 !important;
  color: #c0392b !important;
}
[data-theme="dark"] .quiz-option.correct {
  border-color: #5cc44a !important;
  background: #1a3018 !important;
  color: #5cc44a !important;
}
[data-theme="dark"] .quiz-option.wrong {
  border-color: #e74c3c !important;
  background: #3a1a1a !important;
  color: #e74c3c !important;
}
.quiz-option:disabled { cursor: default; transform: none; }

/* Input (type C) */
.quiz-input-wrap {
  display: flex;
  gap: var(--space-2);
  width: 100%;
}
.quiz-input {
  flex: 1;
  padding: var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  transition: border-color var(--transition-interactive);
  outline: none;
}
.quiz-input:focus { border-color: var(--color-primary); }
.quiz-input.correct { border-color: var(--color-success, #3a8a2e); background: var(--color-success-highlight, #d4f0d0); }
.quiz-input.wrong   { border-color: #c0392b; background: #fde8e6; }
[data-theme="dark"] .quiz-input.correct { border-color: #5cc44a; background: #1a3018; }
[data-theme="dark"] .quiz-input.wrong   { border-color: #e74c3c; background: #3a1a1a; }
.quiz-submit-btn {
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-lg);
  font-weight: 800;
  font-size: var(--text-sm);
  transition: background var(--transition-interactive), transform var(--transition-interactive);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.quiz-submit-btn:hover { background: var(--color-primary-hover); }
.quiz-submit-btn:active { transform: scale(0.97); }
.quiz-submit-btn:disabled { opacity: 0.5; cursor: default; }

/* Feedback */
.quiz-feedback {
  font-size: var(--text-sm);
  font-weight: 700;
  text-align: center;
  min-height: 1.4em;
  transition: all 0.2s;
}
.quiz-feedback.correct { color: var(--color-success, #3a8a2e); }
.quiz-feedback.wrong   { color: #c0392b; }
[data-theme="dark"] .quiz-feedback.correct { color: #5cc44a; }
[data-theme="dark"] .quiz-feedback.wrong   { color: #e74c3c; }

/* Next button */
.quiz-next-btn {
  margin-top: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  width: 100%;
  max-width: 500px;
  transition: background var(--transition-interactive), transform var(--transition-interactive);
  box-shadow: 0 3px 14px rgba(92, 61, 158, 0.3);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.quiz-next-btn:hover { background: var(--color-primary-hover); }
.quiz-next-btn:active { transform: scale(0.98); }

/* Finish score */
.finish-score {
  background: var(--color-primary-highlight);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-8);
  text-align: center;
  width: 100%;
}
.finish-score-number {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 10vw, 4rem);
  color: var(--color-primary);
  line-height: 1;
}
.finish-score-label {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

@media (min-width: 640px) {
  .quiz-bar { padding: var(--space-3) var(--space-6); }
  .quiz-stage { padding: var(--space-8) var(--space-6); }
  .quiz-options { gap: var(--space-3); }
  .quiz-option { padding: var(--space-5) var(--space-4); font-size: var(--text-base); }
  .quiz-big-speak { width: 100px; height: 100px; }
}