:root {
  --quiz-bg: #f4f6fb;
  --quiz-card: #ffffff;
  --quiz-primary: #0f766e;
  --quiz-primary-strong: #115e59;
  --quiz-secondary: #1f2937;
  --quiz-muted: #6b7280;
  --quiz-border: #d1d5db;
  --quiz-success: #16a34a;
  --quiz-error: #dc2626;
  --quiz-accent: #ea580c;
  --quiz-shadow: 0 16px 30px rgba(15, 23, 42, 0.12);
  --quiz-chip-bg: #ecfdf3;
  --quiz-chip-text: #065f46;
  --quiz-surface: #f9fafb;
}

[data-md-color-scheme="slate"] {
  --quiz-bg: #0f172a;
  --quiz-card: #111827;
  --quiz-primary: #34d399;
  --quiz-primary-strong: #10b981;
  --quiz-secondary: #e5e7eb;
  --quiz-muted: #9ca3af;
  --quiz-border: #1f2937;
  --quiz-success: #22c55e;
  --quiz-error: #f87171;
  --quiz-accent: #fb923c;
  --quiz-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
  --quiz-chip-bg: #064e3b;
  --quiz-chip-text: #d1fae5;
  --quiz-surface: #0b1220;
}

#quiz-app {
  margin: 32px auto;
  padding: 28px;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), transparent), var(--quiz-bg);
  border-radius: 24px;
  border: 1px solid var(--quiz-border);
  box-shadow: var(--quiz-shadow);
}

.quiz-stats {
  margin: 20px auto 0;
  padding: 20px 24px;
  border-radius: 18px;
  background: var(--quiz-card);
  border: 1px solid var(--quiz-border);
  box-shadow: var(--quiz-shadow);
}

.quiz-stats-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.quiz-stats-total {
  padding: 12px 16px;
  border-radius: 14px;
  background: var(--quiz-surface);
  border: 1px solid var(--quiz-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.quiz-stats-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--quiz-muted);
}

.quiz-stats-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--quiz-secondary);
}

.quiz-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}

.quiz-stat-card {
  padding: 16px 18px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), transparent),
    var(--quiz-surface);
  border: 1px solid rgba(15, 118, 110, 0.2);
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  width: 100%;
  cursor: pointer;
  font: inherit;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.quiz-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
  border-color: rgba(15, 118, 110, 0.35);
}

.quiz-stat-card[aria-expanded="true"] {
  border-color: rgba(15, 118, 110, 0.5);
}

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

.quiz-stat-title {
  font-weight: 600;
  color: var(--quiz-secondary);
  font-size: 15px;
}

.quiz-stat-count {
  font-size: 20px;
  font-weight: 700;
  color: var(--quiz-primary);
}

.quiz-stat-track {
  height: 8px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.18);
  overflow: hidden;
}

.quiz-stat-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--quiz-primary), var(--quiz-accent));
  transition: width 200ms ease;
}

.quiz-stat-foot {
  font-size: 12px;
  color: var(--quiz-muted);
}

.quiz-stat-action {
  font-size: 12px;
  font-weight: 600;
  color: var(--quiz-primary);
}

.quiz-stat-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.quiz-stat-item {
  color: var(--quiz-secondary);
}

.quiz-stat-row {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.quiz-stat-text {
  flex: 0 1 auto;
}

.quiz-stat-toggle {
  flex-shrink: 0;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(14, 116, 144, 0.12);
  border: 1px solid rgba(14, 116, 144, 0.25);
  color: var(--quiz-secondary);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.quiz-stat-extra {
  margin-top: 8px;
  max-height: 220px;
  overflow: auto;
  padding-right: 6px;
}

.quiz-stat-extra .quiz-code,
.quiz-stat-extra .quiz-table {
  margin-bottom: 0;
}

.quiz-stat-sections {
  display: grid;
  gap: 12px;
}

.quiz-stat-section {
  border: 1px solid var(--quiz-border);
  border-radius: 14px;
  background: var(--quiz-surface);
  padding: 10px 12px;
}

.quiz-stat-section summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  color: var(--quiz-secondary);
}

.quiz-stat-section summary::-webkit-details-marker {
  display: none;
}

.quiz-stat-section-count {
  font-size: 12px;
  color: var(--quiz-muted);
  background: rgba(15, 23, 42, 0.08);
  padding: 4px 8px;
  border-radius: 999px;
}

.quiz-stat-section[open] {
  border-color: rgba(15, 118, 110, 0.4);
  background: rgba(15, 118, 110, 0.08);
}

.quiz-stat-loading,
.quiz-stat-empty {
  color: var(--quiz-muted);
}

.quiz-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 30;
}

.quiz-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.quiz-modal-body {
  position: relative;
  z-index: 1;
  background: var(--quiz-card);
  border-radius: 20px;
  width: min(720px, calc(100% - 32px));
  max-height: min(80vh, 640px);
  border: 1px solid var(--quiz-border);
  box-shadow: var(--quiz-shadow);
  display: flex;
  flex-direction: column;
  animation: quiz-fade 180ms ease;
}

.quiz-modal-header {
  padding: 18px 20px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--quiz-border);
}

.quiz-modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--quiz-secondary);
}

.quiz-modal-close {
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.quiz-modal-content {
  padding: 16px 20px 20px;
  overflow: auto;
  color: var(--quiz-secondary);
  font-size: 14px;
}

.quiz-stats-table {
  width: 100%;
  border-collapse: collapse;
}

.quiz-stats-table th,
.quiz-stats-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--quiz-border);
  color: var(--quiz-secondary);
}

.quiz-stats-table th {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--quiz-muted);
}

.quiz-stats-table tr:last-child td {
  border-bottom: none;
}

.quiz-card {
  background: var(--quiz-card);
  padding: 28px;
  border-radius: 18px;
  box-shadow: var(--quiz-shadow);
  animation: quiz-fade 220ms ease;
}

.quiz-title {
  margin-top: 0;
  font-size: 30px;
  color: var(--quiz-secondary);
}

.quiz-subtitle {
  color: var(--quiz-muted);
  margin-bottom: 20px;
}

.quiz-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.quiz-setup-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.6fr) minmax(280px, 1fr);
  gap: 20px;
  margin-bottom: 10px;
}

.quiz-setup-right {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-toggle {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.quiz-toggle-button {
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  border-radius: 999px;
  padding: 6px 14px;
  font-weight: 600;
  cursor: pointer;
}

.quiz-toggle-button.active {
  background: var(--quiz-primary);
  border-color: var(--quiz-primary);
  color: #fff;
}

#quiz-category-search {
  padding: 10px 12px;
  border: 1px solid var(--quiz-border);
  border-radius: 10px;
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
}

.quiz-categories.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.quiz-field label {
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
  color: var(--quiz-secondary);
}

.quiz-field input[type="number"] {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--quiz-border);
  padding: 10px 12px;
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
}

.quiz-help {
  margin-top: 8px;
  font-size: 13px;
  color: var(--quiz-muted);
}

.quiz-chip-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin: 12px 0 18px;
}

.quiz-chip {
  background: var(--quiz-chip-bg);
  color: var(--quiz-chip-text);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}

.quiz-chip.action {
  border: none;
  cursor: pointer;
}

.quiz-chip.accent {
  background: rgba(234, 88, 12, 0.16);
  color: var(--quiz-accent);
}

.quiz-scenarios {
  border: 1px solid var(--quiz-border);
  background: var(--quiz-card);
  border-radius: 16px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 12px 0 10px;
}

.quiz-scenarios-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--quiz-muted);
  font-weight: 700;
}

.quiz-scenarios-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.quiz-scenario {
  border: 1px solid rgba(15, 118, 110, 0.3);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  padding: 7px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.quiz-scenario:hover {
  transform: translateY(-1px);
  border-color: var(--quiz-primary);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
}

.quiz-difficulties {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.quiz-difficulties.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.quiz-difficulty {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.quiz-difficulty.selected {
  border-color: var(--quiz-primary);
  background: rgba(15, 118, 110, 0.12);
  transform: translateY(-1px);
}

.quiz-difficulty input {
  display: none;
}

.quiz-difficulty-title {
  font-weight: 600;
}

.quiz-field-strong {
  border-radius: 16px;
  padding: 14px 16px;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), transparent),
    var(--quiz-card);
  border: 1px solid rgba(15, 118, 110, 0.25);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
}

.quiz-field-strong input[type="number"] {
  font-size: 20px;
  padding: 12px 14px;
}

.quiz-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-height: 220px;
  overflow: auto;
  padding: 6px 6px 4px 2px;
}

.quiz-category {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
  user-select: none;
}

.quiz-category.selected {
  border-color: var(--quiz-primary);
  background: rgba(15, 118, 110, 0.15);
  transform: translateY(-1px);
}

.quiz-category input {
  display: none;
}

.quiz-category-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--quiz-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}

.quiz-button {
  background: var(--quiz-primary);
  color: #fff;
  padding: 12px 20px;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}

.quiz-button:hover {
  background: var(--quiz-primary-strong);
  transform: translateY(-1px);
}

.quiz-button.secondary {
  background: transparent;
  color: var(--quiz-secondary);
  border: 1px solid var(--quiz-border);
}

.quiz-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--quiz-muted);
  margin-bottom: 12px;
}

.quiz-progress-bar {
  height: 6px;
  background: var(--quiz-border);
  border-radius: 999px;
  overflow: hidden;
  margin: 10px 0 20px;
}

.quiz-progress-bar span {
  display: block;
  height: 100%;
  background: var(--quiz-primary);
  border-radius: inherit;
  transition: width 200ms ease;
}


.quiz-question {
  font-size: 20px;
  font-weight: 600;
  margin: 12px 0 16px;
  color: var(--quiz-secondary);
}

.quiz-question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.quiz-question-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  border: 1px solid rgba(15, 118, 110, 0.25);
  color: var(--quiz-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.quiz-question-chip.difficulty {
  background: rgba(234, 88, 12, 0.14);
  border-color: rgba(234, 88, 12, 0.3);
  color: var(--quiz-accent);
}

.quiz-review-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 10px;
}

.quiz-question-main {
  margin-bottom: 12px;
}

.quiz-code {
  margin: 0 0 12px;
  background: rgba(15, 23, 42, 0.08);
  border: 1px solid var(--quiz-border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  overflow: auto;
}

.quiz-code code {
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono",
    monospace;
  font-size: 13px;
}

.quiz-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--quiz-card);
  border: 1px solid var(--quiz-border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 12px;
}

.quiz-table th,
.quiz-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--quiz-border);
  text-align: left;
  font-size: 13px;
}

.quiz-table thead th {
  background: var(--quiz-surface);
  font-weight: 600;
}

.quiz-question-extra {
  margin-bottom: 12px;
}

.quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  transition: border-color 150ms ease, background 150ms ease;
}

.quiz-option.correct {
  border-color: var(--quiz-success);
  background: rgba(22, 163, 74, 0.15);
}

.quiz-option.incorrect {
  border-color: var(--quiz-error);
  background: rgba(220, 38, 38, 0.15);
}

.quiz-feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
}

.quiz-feedback.correct {
  background: rgba(22, 163, 74, 0.12);
  color: var(--quiz-success);
  border-color: rgba(22, 163, 74, 0.3);
}

.quiz-feedback.incorrect {
  background: rgba(220, 38, 38, 0.12);
  color: var(--quiz-error);
  border-color: rgba(220, 38, 38, 0.3);
}

.quiz-error {
  background: rgba(220, 38, 38, 0.12);
  color: var(--quiz-error);
  border: 1px solid rgba(220, 38, 38, 0.3);
  padding: 10px 12px;
  border-radius: 8px;
  margin-top: 12px;
}

.quiz-hint {
  margin-top: 8px;
  font-size: 15px;
}

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

.quiz-review-list {
  display: grid;
  gap: 16px;
  margin-top: 12px;
}

.quiz-review-note {
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--quiz-card);
  border: 1px solid var(--quiz-border);
  color: var(--quiz-muted);
  font-size: 14px;
}

.quiz-review {
  background: linear-gradient(140deg, rgba(14, 116, 144, 0.12), rgba(34, 197, 94, 0.08));
  border: 1px solid rgba(14, 116, 144, 0.2);
}

.quiz-review-item {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--quiz-border);
  background: var(--quiz-surface);
}

.quiz-review-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
  cursor: pointer;
}

.quiz-review-title {
  font-weight: 600;
  color: var(--quiz-secondary);
}

.quiz-review-options {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: opacity 150ms ease, max-height 150ms ease;
}

.quiz-review-options.open {
  max-height: 500px;
  opacity: 1;
}

.quiz-review-item.open .quiz-review-title {
  color: var(--quiz-primary-strong);
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
}

.quiz-actions .quiz-button#open-review {
  margin-left: auto;
}
.quiz-review-option {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--quiz-border);
  background: var(--quiz-card);
  color: var(--quiz-secondary);
  font-size: 14px;
  display: grid;
  gap: 6px;
}

.quiz-review-option-text {
  font-weight: 600;
}

.quiz-review-option-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
  color: var(--quiz-muted);
}

.quiz-review-option-badges span {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  color: var(--quiz-primary-strong);
  font-weight: 600;
}

.quiz-review-option.correct {
  border-color: var(--quiz-success);
  background: rgba(22, 163, 74, 0.12);
}

.quiz-review-option.incorrect {
  border-color: var(--quiz-error);
  background: rgba(220, 38, 38, 0.12);
}

.quiz-review-option.missed {
  border-style: dashed;
}

.quiz-review-hint {
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(15, 118, 110, 0.08);
  border: 1px dashed rgba(15, 118, 110, 0.4);
  color: var(--quiz-primary-strong);
  font-weight: 600;
  margin-bottom: 10px;
}

.quiz-review-hint.correct {
  background: rgba(22, 163, 74, 0.16);
  border-color: rgba(22, 163, 74, 0.45);
  color: #0f5132;
}

.quiz-review-hint.incorrect {
  background: rgba(220, 38, 38, 0.12);
  border-color: rgba(220, 38, 38, 0.4);
  color: #7f1d1d;
}

.quiz-score {
  font-size: 36px;
  font-weight: 700;
  color: var(--quiz-secondary);
}

.quiz-pass {
  margin-top: 12px;
  font-size: 18px;
  font-weight: 600;
}

.quiz-pass.success {
  color: var(--quiz-success);
}

.quiz-pass.fail {
  color: var(--quiz-error);
}

.quiz-actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.quiz-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  background: var(--quiz-surface);
  color: var(--quiz-secondary);
  border: 1px solid var(--quiz-border);
}

.quiz-badge.success {
  color: var(--quiz-success);
  border-color: rgba(22, 163, 74, 0.3);
  background: rgba(22, 163, 74, 0.12);
}

.quiz-badge.fail {
  color: var(--quiz-error);
  border-color: rgba(220, 38, 38, 0.3);
  background: rgba(220, 38, 38, 0.12);
}

.quiz-tip {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(234, 88, 12, 0.12);
  border: 1px dashed rgba(234, 88, 12, 0.4);
  color: var(--quiz-accent);
  font-weight: 600;
}

@keyframes quiz-fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


@media (max-width: 600px) {
  #quiz-app {
    padding: 18px;
  }

  .quiz-card {
    padding: 20px;
  }

  .quiz-title {
    font-size: 24px;
  }

  .quiz-setup-grid {
    grid-template-columns: 1fr;
  }
}