:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #f9fbff;
  --text: #172033;
  --muted: #647086;
  --line: #d8deea;
  --primary: #2557d6;
  --primary-dark: #163e9e;
  --primary-soft: #e8efff;
  --good: #117a43;
  --good-soft: #e8f6ee;
  --bad: #b42318;
  --bad-soft: #fff0ee;
  --warn: #946200;
  --warn-soft: #fff8df;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, select {
  font: inherit;
}

button {
  min-height: 44px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
}

button:disabled {
  opacity: 0.48;
}

select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 8px 10px;
}

.app {
  width: min(100%, 760px);
  margin: 0 auto;
  padding: 18px 14px 32px;
}

.app-header {
  padding: 4px 2px 0;
}

.app-header h1 {
  margin: 4px 0;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.summary, .meta, .explanation, .empty {
  color: var(--muted);
}

.summary {
  margin: 8px 0 0;
  line-height: 1.45;
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 18px 0 0;
}

.mode-tabs button.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
  font-weight: 700;
}

.controls, .quiz, .result {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  margin-top: 12px;
}

.controls {
  display: grid;
  gap: 10px;
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.question-card {
  display: grid;
  gap: 14px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
  background: var(--surface-2);
}

.question-title {
  font-size: 19px;
  line-height: 1.45;
  margin: 0;
  letter-spacing: 0;
}

.choices {
  display: grid;
  gap: 10px;
}

.choice {
  width: 100%;
  text-align: left;
  line-height: 1.35;
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 8px;
  align-items: start;
}

.choice-index {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.choice.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.choice.correct {
  border-color: var(--good);
  background: var(--good-soft);
}

.choice.wrong {
  border-color: var(--bad);
  background: var(--bad-soft);
}

.footer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.footer-actions.three {
  grid-template-columns: 1fr 1fr 1fr;
}

.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
  font-weight: 700;
}

.danger {
  border-color: var(--bad);
  color: var(--bad);
}

.feedback {
  border-left: 4px solid var(--line);
  padding: 10px 12px;
  background: var(--surface-2);
  line-height: 1.45;
}

.feedback.good {
  border-color: var(--good);
}

.feedback.bad {
  border-color: var(--bad);
}

.feedback strong {
  display: block;
  margin-bottom: 6px;
}

.result h2, .result h3 {
  margin: 0 0 10px;
  letter-spacing: 0;
}

.score {
  font-size: 26px;
  font-weight: 800;
  margin: 6px 0 14px;
}

.domain-score {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding: 10px 0;
}

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

.review-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--surface-2);
}

.review-item.correct {
  border-color: #b7dec6;
}

.review-item.wrong {
  border-color: #f2b8b1;
}

.review-item p {
  margin: 8px 0;
  line-height: 1.45;
}

.empty {
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 420px) {
  .app {
    padding-inline: 10px;
  }

  .app-header h1 {
    font-size: 24px;
  }

  .control-grid, .footer-actions, .footer-actions.three {
    grid-template-columns: 1fr;
  }

  .question-title {
    font-size: 18px;
  }
}