/* Category quiz — all routes (Topics, Practice, Study, Mock when live) share this layout */

:root {
  --quiz-radius: 1rem;
}

.quiz-body {
  margin: 0;
  padding: 0;
  background: var(--color-bg-page-gradient), var(--color-bg-page);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  transition: background 0.25s ease;
}

body.has-site-header.quiz-body {
  overflow-x: hidden;
  overflow-y: auto;
  min-height: 100vh;
  min-height: 100dvh;
}

body.has-site-header.quiz-body .site-page-content {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: visible;
}

.quiz-layout {
  display: flex;
  flex: 1 1 auto;
  align-items: flex-start;
  max-width: min(1100px, 100%);
  width: 100%;
  min-height: 0;
  height: auto;
  margin: 0 auto;
  padding: max(0.5rem, env(safe-area-inset-top, 0px)) max(0.65rem, env(safe-area-inset-right, 0px))
    max(0.65rem, env(safe-area-inset-bottom, 0px)) max(0.65rem, env(safe-area-inset-left, 0px));
  gap: clamp(0.65rem, 2vw, 0.85rem);
  box-sizing: border-box;
}

.quiz-main {
  flex: 1 1 auto;
  min-width: 0;
  min-height: auto;
  display: flex;
  flex-direction: column;
}

.quiz-page-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.quiz-category-title {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(1rem, 3.5vw, 1.2rem);
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1.25;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.quiz-question-meta {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.quiz-question-meta #header-q-num {
  color: var(--color-accent-text);
}

.meta-sep {
  margin: 0 0.1rem;
  opacity: 0.45;
}

.question-block {
  flex: 0 0 auto;
  width: 100%;
  min-height: auto;
  display: flex;
  flex-direction: column;
}

.question-block.hidden {
  display: none;
}

.dtc-question-card {
  flex: 0 0 auto;
  width: 100%;
  min-height: auto;
  display: block;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-card);
  border-radius: var(--quiz-radius);
  box-shadow: var(--color-shadow-md);
  overflow: visible;
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.dtc-question-card .card-body {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  gap: 0;
  min-height: auto;
}

.test-module .question-header {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin: 0 0 0.75rem;
}

.test-module .question-title {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  flex-shrink: 0;
  font-size: clamp(1rem, 3.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text-primary);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.quiz-breadcrumb {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--color-text-muted);
}

.quiz-breadcrumb a {
  color: var(--color-accent-text);
  text-decoration: none;
}

.quiz-breadcrumb a:hover {
  text-decoration: underline;
}

.quiz-breadcrumb__sep {
  margin: 0 0.35rem;
  opacity: 0.65;
}

.quiz-breadcrumb__current {
  color: var(--color-text-secondary);
}

/* DTC original: sign image is 40% of card body width, stacked above options */
.sign-block {
  width: 100%;
  margin: 0 0 0.25rem;
}

.dtc-question-card .sign-image {
  width: 40%;
  max-width: none;
  max-height: none;
  height: auto;
  object-fit: contain;
  object-position: left center;
  display: block;
}

.sign-divider {
  width: 100%;
  margin: 0.75rem 0 1rem;
  border: 0;
  border-top: 1px dotted var(--color-border-strong, #cbd5e1);
  opacity: 0.85;
}

.dtc-question-card .no-sign {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.test-module .options-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.test-module .options-list .option-row {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-option);
  padding: 0;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.test-module .options-list .option-row:hover:not(.correct-answer):not(.incorrect-answer) {
  border-color: var(--color-option-hover-border);
  background: var(--color-bg-option-hover);
}

.option-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0.45rem 0.55rem;
  cursor: pointer;
  width: 100%;
}

.option-letter {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 4px;
  background: var(--color-letter-bg);
  color: var(--color-letter-text);
  font-size: 0.7rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}

.option-row:hover:not(.correct-answer):not(.incorrect-answer) .option-letter {
  background: var(--color-accent-soft);
  color: var(--color-accent-text);
}

.option-row input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.option-icon {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: bold;
}

.option-text {
  flex: 1;
  font-size: 0.88rem;
  line-height: 1.3;
  color: var(--color-text-primary);
}

.quiz-speak-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg-surface-muted);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.question-speak-btn {
  width: 2.25rem;
  height: 2.25rem;
  margin-top: 0.1rem;
}

.option-speak-btn {
  margin-left: auto;
}

.quiz-speak-btn:hover {
  color: var(--color-accent-text);
  border-color: var(--color-accent-soft);
  background: var(--color-accent-soft);
}

.quiz-speak-btn:focus-visible {
  outline: 2px solid var(--color-accent-text);
  outline-offset: 2px;
}

.quiz-speak-btn.is-speaking {
  color: #fff;
  border-color: var(--color-accent-text);
  background: var(--color-accent-text);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.quiz-speak-btn__icon {
  display: block;
}

.option-row.correct-answer .quiz-speak-btn,
.option-row.incorrect-answer .quiz-speak-btn {
  opacity: 0.85;
}

.option-row.correct-answer {
  border-color: var(--color-correct-border);
  background: var(--color-correct-bg);
}

.option-row.correct-answer .option-letter {
  background: var(--color-correct);
  color: var(--color-text-inverse);
}

.option-row.correct-answer .check-icon {
  display: flex;
  background: var(--color-correct);
  color: var(--color-text-inverse);
}

.option-row.incorrect-answer {
  border-color: var(--color-incorrect-border);
  background: var(--color-incorrect-bg);
}

.option-row.incorrect-answer .option-letter {
  background: var(--color-incorrect);
  color: var(--color-text-inverse);
}

.option-row.incorrect-answer .cross-icon {
  display: flex;
  background: var(--color-incorrect);
  color: var(--color-text-inverse);
}

.option-row.incorrect-answer .option-text {
  text-decoration: line-through;
  opacity: 0.85;
}

.explanation-block {
  flex-shrink: 0;
  margin: 0;
  padding: 0.5rem 0.65rem;
  background: var(--color-bg-explanation);
  border-radius: 8px;
  border-left: 3px solid var(--color-accent);
  font-size: 0.82rem;
  line-height: 1.35;
  max-height: 4.5rem;
  overflow-y: auto;
  transition: background 0.25s ease;
}

.explanation-block .explanation-text {
  margin: 0;
  color: var(--color-text-explanation);
}

.card-footer.quiz-actions {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0;
  padding-top: 0.45rem;
  border-top: 1px solid var(--color-divider);
}

.back-link {
  color: var(--color-link);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--color-link-hover);
}

.btn-next {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1.1rem;
  background: var(--color-btn-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  transition: background 0.2s;
}

.btn-next:hover {
  background: var(--color-btn-primary-hover);
}

.quiz-sidebar {
  width: 200px;
  flex: 0 0 200px;
  align-self: flex-start;
  position: sticky;
  top: 0.5rem;
  max-height: calc(100dvh - var(--site-header-h, 56px) - 1rem);
  display: flex;
  flex-direction: column;
  min-height: auto;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-card);
  border-radius: var(--quiz-radius);
  padding: 1rem 0.9rem;
  box-shadow: var(--color-shadow-md);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.sidebar-badge {
  margin: 0 0 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent-text);
}

.sidebar-progress-block {
  flex-shrink: 0;
  margin-bottom: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--color-divider);
}

.sidebar-progress-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.sidebar-progress-pct {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-accent-text);
}

.progress-track {
  height: 7px;
  background: var(--color-progress-track);
  border-radius: 999px;
  overflow: hidden;
  transition: background 0.25s ease;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--color-progress-fill);
  border-radius: 999px;
  transition: width 0.35s ease, background 0.25s ease;
}

.grid-label {
  flex-shrink: 0;
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.question-grid {
  flex: 1;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(2rem, 1fr));
  gap: 6px;
  align-content: start;
  padding: 4px 6px 4px 4px;
  -webkit-overflow-scrolling: touch;
}

.question-grid::-webkit-scrollbar {
  width: 4px;
}

.question-grid::-webkit-scrollbar-thumb {
  background: var(--color-scrollbar);
  border-radius: 4px;
}

.grid-num {
  width: 100%;
  aspect-ratio: 1;
  min-height: 30px;
  font-size: 0.78rem;
  font-weight: 700;
  border: 2px solid transparent;
  border-radius: 7px;
  background: var(--color-bg-grid-cell);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  box-sizing: border-box;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.grid-num:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent-text);
}

.grid-num.is-current {
  background: var(--color-bg-grid-current);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

.grid-num.done-correct {
  background: var(--color-correct-bg);
  color: var(--color-correct-text);
}

.grid-num.done-incorrect {
  background: var(--color-incorrect-bg);
  color: var(--color-incorrect-text);
}

.sidebar-stats {
  flex-shrink: 0;
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-divider);
  font-size: 0.75rem;
}

.stat-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.45rem 0.35rem;
  border-radius: 8px;
  gap: 0.15rem;
  transition: background 0.25s ease;
}

.stat-correct-card {
  background: var(--color-bg-stat-correct);
}

.stat-incorrect-card {
  background: var(--color-bg-stat-incorrect);
}

.stat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.correct-dot {
  background: var(--color-correct);
}

.incorrect-dot {
  background: var(--color-incorrect);
}

.stat-value {
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-text-primary);
}

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

@media (max-width: 900px) {
  .quiz-layout {
    flex-direction: column;
  }

  .quiz-sidebar {
    position: static;
    max-height: none;
    flex: 0 0 auto;
    width: 100%;
  }

  .dtc-question-card .sign-image {
    width: 40%;
    min-width: 120px;
  }

  .quiz-sidebar {
    width: 100%;
    max-height: none;
    flex-shrink: 0;
  }

  .question-grid {
    max-height: min(140px, 28vh);
    grid-template-columns: repeat(auto-fill, minmax(2.25rem, 1fr));
  }

  .quiz-page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .quiz-question-meta {
    align-self: flex-end;
  }

  .dtc-question-card .card-body {
    padding: 0.75rem 0.85rem;
  }

  .option-label {
    min-height: 44px;
    padding: 0.5rem 0.55rem;
  }

  .btn-next {
    min-height: 44px;
    padding: 0.5rem 1.15rem;
  }

  .back-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

@media (max-width: 380px) {
  .quiz-layout {
    padding-left: max(0.5rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.5rem, env(safe-area-inset-right, 0px));
  }

  .question-grid {
    grid-template-columns: repeat(auto-fill, minmax(1.85rem, 1fr));
    gap: 4px;
  }

  .grid-num {
    font-size: 0.72rem;
    min-height: 28px;
  }

  .sidebar-stats {
    flex-direction: column;
  }

  .stat-card {
    flex-direction: row;
    justify-content: center;
    width: 100%;
    gap: 0.5rem;
  }
}

@media (min-width: 901px) and (max-width: 1100px) {
  .quiz-sidebar {
    width: 180px;
    padding: 0.85rem 0.7rem;
  }

  .question-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-height: 700px) and (min-width: 901px) {
  .test-module .question-title {
    font-size: 1rem;
  }

  .option-label {
    padding: 0.35rem 0.45rem;
  }

  .option-text {
    font-size: 0.82rem;
  }
}