/* quiz.css — quiz screen: question cards, choices, spelling, feedback */

[data-screen="quiz"] {
  background: linear-gradient(160deg, #f4f0ff 0%, #e0d8ff 100%);
  gap: var(--space-md);
}

/* ── Quiz Header ─────────────────────────────────────────────── */

.quiz-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.quiz-mode-label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  background: var(--color-primary-lt);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  flex: 1;
  text-align: center;
}

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

.quiz-progress-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
}

.quiz-progress-track {
  flex: 1;
  height: 1.2rem;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transform-origin: left center;
  transform: scaleX(0);
  will-change: transform;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.quiz-progress-label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  min-width: 4rem;
  text-align: right;
}

/* ── Streak Badge ─────────────────────────────────────────────── */

.streak-badge {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--color-surface-2);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.streak-badge--active {
  background: #fff3e0;
  color: #e65100;
}

.streak-badge--fire {
  background: linear-gradient(135deg, #ff9800, #f44336);
  color: white;
  animation: firePulse 1s ease infinite;
}

@keyframes firePulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.05); }
}

/* ── Question Card ────────────────────────────────────────────── */

.quiz-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.question-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
}

.question-prompt {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  position: relative;
}

.prompt--english {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: var(--color-primary);
  font-family: 'Georgia', serif;
}

.prompt--chinese {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
}

.btn-speak {
  font-size: var(--font-size-xl);
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  width: 4rem;
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-speak:hover {
  background: var(--color-primary);
  transform: scale(1.1);
}

/* ── Multiple Choice ─────────────────────────────────────────── */

.mc-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.mc-choice {
  padding: var(--space-md);
  background: white;
  border: 2.5px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  text-align: center;
  word-break: break-word;
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mc-choice:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-surface-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.mc-choice:active:not(:disabled) {
  transform: scale(0.97);
}

.mc-choice--correct {
  border-color: var(--color-success) !important;
  background: var(--color-success-lt) !important;
  color: #006644 !important;
  animation: correctPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mc-choice--wrong {
  border-color: var(--color-error) !important;
  background: #ffe0e0 !important;
  color: var(--color-error) !important;
  animation: wrongShake 0.4s ease;
}

@keyframes correctPop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.06); }
  100% { transform: scale(1); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

/* ── Spelling Mode ───────────────────────────────────────────── */

.spell-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  font-style: italic;
  padding: 0 var(--space-md);
}

.spell-controls {
  display: flex;
  justify-content: center;
}

.btn-speak-big {
  padding: var(--space-sm) var(--space-xl);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-lg);
  font-weight: 700;
  box-shadow: 0 4px 0 var(--color-primary-dk);
  transition: all var(--transition-fast);
}

.btn-speak-big:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--color-primary-dk);
}

.btn-speak-big:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--color-primary-dk);
}

.spell-boxes {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  padding: var(--space-sm) 0;
}

.spell-box {
  width: 4.4rem;
  height: 5.2rem;
  border-radius: var(--radius-sm);
  border: 2.5px solid var(--color-primary-lt);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.spell-box--revealed {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
}

.spell-box--success {
  border-color: var(--color-success) !important;
  background: var(--color-success-lt) !important;
  animation: correctPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.spell-letter {
  font-size: var(--font-size-xl);
  font-weight: 900;
  color: var(--color-primary);
  font-family: 'Georgia', serif;
  text-transform: uppercase;
}

.spell-letter--typed {
  color: var(--color-text);
}

.spell-letter--correct {
  color: var(--color-success);
}

.spell-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 2.5px solid var(--color-primary-lt);
  border-radius: var(--radius-md);
  font-size: var(--font-size-lg);
  text-align: center;
  background: white;
  transition: border-color var(--transition-fast);
  text-transform: lowercase;
}

.spell-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.btn-spell-submit {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-lg);
  font-weight: 700;
  box-shadow: 0 4px 0 var(--color-pink-dk);
  transition: all var(--transition-fast);
}

.btn-spell-submit:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--color-pink-dk);
}

.btn-spell-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ── Sentence Fill ───────────────────────────────────────────── */

.prompt--sentence {
  font-size: var(--font-size-lg);
  line-height: 2;
  color: var(--color-text);
  font-weight: 600;
  text-align: left;
}

.sentence-word-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--space-xs);
}

.blank {
  display: inline-block;
  min-width: 6rem;
  border-bottom: 3px solid var(--color-primary);
  color: var(--color-primary);
  font-weight: 700;
  text-align: center;
  padding: 0 var(--space-xs);
}

/* ── Feedback Banner ─────────────────────────────────────────── */

.feedback-banner {
  position: fixed;
  bottom: 2.4rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 1.4rem 2.8rem;
  border-radius: var(--radius-xl);
  font-size: var(--font-size-lg);
  font-weight: 700;
  z-index: 100;
  box-shadow: var(--shadow-lg);
  animation: bannerIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
  max-width: 90vw;
  text-align: center;
}

.feedback-banner--correct {
  background: var(--color-success);
  color: white;
  white-space: nowrap;
  border-radius: var(--radius-full);
}

.feedback-banner--wrong {
  background: #fff3f3;
  color: var(--color-text);
  border: 2.5px solid var(--color-error-lt);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.feedback-wrong-info { white-space: nowrap; }

.feedback-icon { margin-right: var(--space-xs); }

@keyframes bannerIn {
  from { transform: translateX(-50%) translateY(6rem); opacity: 0; }
  to   { transform: translateX(-50%) translateY(0);   opacity: 1; }
}

/* ── Quiz RWD ────────────────────────────────────────────────── */

/* Small phones: single column choices */
@media (max-width: 340px) {
  .mc-choices { grid-template-columns: 1fr; }
  .prompt--english { font-size: var(--font-size-2xl); }
  .spell-box { width: 3.8rem; height: 4.6rem; }
  .spell-letter { font-size: var(--font-size-lg); }
}

/* Tablets+: larger question card, bigger choices */
@media (min-width: 600px) {
  .question-prompt { padding: var(--space-xl); }
  .prompt--english { font-size: clamp(3.2rem, 8vw, 4.8rem); }
  .prompt--chinese { font-size: clamp(2.4rem, 6vw, 3.2rem); }
  .mc-choice { font-size: var(--font-size-lg); min-height: 7rem; }
  .spell-box { width: 5rem; height: 6rem; }
  .spell-letter { font-size: var(--font-size-2xl); }
  .btn-speak-big { font-size: var(--font-size-xl); }
}