/* ===== Quiz Layout: 3 independent fixed layers ===== */

/* Layer 1: header — fixed at very top */
.quiz-header-layer {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 448px;
  z-index: 200;
  padding-top: calc(10vh + 8px);
  background: transparent;
}

/* Layer 2: history — fixed Y -10% to 40%, bottom-aligned */
.quiz-history-layer {
  position: fixed;
  top: -10vh;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 448px;
  height: 50vh;
  z-index: 50;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  pointer-events: none;
}

/* Layer 3: quiz content — fixed from Y 40% to bottom, top-aligned */
.quiz-fixed-layer {
  position: fixed;
  top: 40vh;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 448px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-primary);
  overflow-y: auto;
}

/* ===== Progress Bar ===== */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: #143c7d;
  border-radius: 3px;
  transition: width 0.3s ease;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.quiz-header__info {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ===== Timer Bar ===== */
.timer-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  overflow: hidden;
}

.timer-bar__fill {
  height: 100%;
  background: var(--warning);
  border-radius: 2px;
  transition: width 0.1s linear;
}

.timer-bar__fill--danger {
  background: var(--danger);
}

/* ===== Kana Image ===== */
.kana-display {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 180px;
  min-height: 160px;
  padding: 12px;
  flex-shrink: 0;
}

.kana-image {
  max-width: 180px;
  max-height: 180px;
  width: 100%;
  height: auto;
  object-fit: contain;
  image-rendering: auto;
  filter: var(--kana-filter, none);
}

[data-theme="dark"] .kana-image {
  --kana-filter: invert(1) hue-rotate(180deg);
}

/* Word mode: multiple images in a row */
.kana-display--word {
  gap: 4px;
  flex-wrap: wrap;
}

.kana-display--word .kana-image {
  max-width: 100px;
  max-height: 100px;
}

.kana-display--word .kana-image--active {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.kana-display--word .kana-image--done {
  opacity: 0.4;
}

/* ===== Quiz Stats ===== */
.quiz-stats {
  min-height: 20px;
  flex-shrink: 0;
}

.quiz-answer-area {
  flex-shrink: 0;
}

.quiz-feedback-area {
  flex-shrink: 0;
}

/* ===== Choice Grid ===== */
.choice-grid {
  display: grid;
  gap: 8px;
}

.choice-grid--3 { grid-template-columns: repeat(3, 1fr); }
.choice-grid--4 { grid-template-columns: repeat(4, 1fr); }
.choice-grid--5 { grid-template-columns: repeat(5, 1fr); }
.choice-grid--6 { grid-template-columns: repeat(6, 1fr); }

.choice-btn {
  padding: 18px 4px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  -webkit-tap-highlight-color: transparent;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.choice-btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.choice-btn:active {
  transform: scale(0.96);
}

.choice-btn--correct {
  border-color: var(--success);
  background: var(--success-light);
  color: var(--success);
  pointer-events: none;
}

.choice-btn--wrong {
  border-color: var(--danger);
  background: var(--danger-light);
  color: var(--danger);
  pointer-events: none;
}

.choice-btn--disabled {
  opacity: 0.4;
  pointer-events: none;
}

.choice-btn__jibo {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ===== Text Input Answer ===== */
.text-answer {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.text-answer__input {
  width: 100%;
  max-width: 300px;
  padding: 14px 18px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1.8rem;
  text-align: center;
  letter-spacing: 0.2em;
  font-family: inherit;
  transition: border-color var(--transition);
}

.text-answer__input:focus {
  outline: none;
  border-color: var(--accent);
}

.text-answer__input--correct {
  border-color: var(--success);
  background: var(--success-light);
}

.text-answer__input--wrong {
  border-color: var(--danger);
  background: var(--danger-light);
}

/* ===== Feedback ===== */
.feedback {
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-md);
  font-weight: 600;
  animation: fadeIn 0.2s ease;
}

.feedback--correct {
  background: var(--success-light);
  color: var(--success);
}

.feedback--wrong {
  background: var(--danger-light);
  color: var(--danger);
}

.feedback__detail {
  font-size: 0.85rem;
  font-weight: 400;
  margin-top: 4px;
  color: var(--text-secondary);
}

/* ===== Result Screen ===== */
.result-summary {
  text-align: center;
  padding: 32px 16px;
}

.result-summary__score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.result-summary__label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
}

.result-stat {
  text-align: center;
}

.result-stat__value {
  font-size: 1.2rem;
  font-weight: 700;
}

.result-stat__label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== Wrong List ===== */
.wrong-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.wrong-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.wrong-item__image {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

[data-theme="dark"] .wrong-item__image {
  filter: invert(1) hue-rotate(180deg);
}

.wrong-item__info {
  flex: 1;
}

.wrong-item__answer {
  color: var(--danger);
  font-size: 0.85rem;
}

.wrong-item__correct {
  color: var(--success);
  font-weight: 600;
}

/* ===== Quiz History ===== */
.quiz-history {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 40%);
  mask-image: linear-gradient(to bottom, transparent 0%, black 40%);
  scrollbar-width: none;
}

.quiz-history::-webkit-scrollbar {
  display: none;
}

.quiz-history-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 2px 8px;
  opacity: 0.7;
  flex-shrink: 0;
}

.quiz-history-item__img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  filter: var(--kana-filter, none);
}

[data-theme="dark"] .quiz-history-item__img {
  filter: invert(1) hue-rotate(180deg);
}

.quiz-history-item__reading {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.quiz-history-item__jibo {
  font-size: 0.65rem;
  color: var(--text-muted);
  opacity: 0.6;
}

.quiz-history-item--latest {
  opacity: 1;
}
.quiz-history-item--latest .quiz-history-item__img {
  width: 52px;
  height: 52px;
}
.quiz-history-item--latest .quiz-history-item__reading {
  font-size: 1.2rem;
}
.quiz-history-item--latest .quiz-history-item__jibo {
  font-size: 0.85rem;
  opacity: 0.7;
}