:root {
  color-scheme: light;
  --primary: #311d72;
  --ink: #172033;
  --muted: #647085;
  --line: #e5e7ef;
  --gold: #f6bc37;
  --green: #138a55;
  --red: #c2410c;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f6f8fb;
}

button,
input {
  font: inherit;
}

button,
.result-actions a {
  min-height: 44px;
  padding: 0 18px;
  color: #fff;
  background: var(--primary);
  border: 0;
  border-radius: 8px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

button.secondary {
  color: var(--primary);
  background: #fff;
  border: 1px solid var(--line);
}

textarea {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.hero,
.exam-top,
.question-card,
.palette,
.results {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(22, 28, 45, 0.08);
}

.hero {
  min-height: calc(100vh - 56px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 28px;
  align-items: center;
  padding: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero p,
.exam-top p {
  max-width: 720px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.65;
}

.launch-card {
  display: grid;
  gap: 10px;
  padding: 20px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.launch-card label {
  font-weight: 900;
}

.launch-card div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.launch-card input {
  min-width: 0;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.launch-card a {
  color: var(--primary);
  font-weight: 900;
  text-decoration: none;
}

.participant-card {
  display: grid;
  gap: 12px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.participant-card strong {
  color: var(--ink);
}

.participant-card form {
  display: grid;
  gap: 10px;
}

.participant-card input {
  min-width: 0;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.exam {
  display: grid;
  gap: 18px;
}

.exam-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 24px;
}

.exam-top h1 {
  font-size: clamp(28px, 4vw, 44px);
}

.timer {
  min-width: 132px;
  padding: 14px;
  text-align: center;
  color: #fff;
  background: var(--primary);
  border-radius: 8px;
}

.timer strong {
  display: block;
  font-size: 28px;
}

.timer span {
  color: rgba(255, 255, 255, 0.78);
}

.exam-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
}

.palette,
.question-card,
.results {
  padding: 20px;
}

.palette {
  align-self: start;
  position: sticky;
  top: 18px;
  display: grid;
  gap: 16px;
}

.palette-head,
.question-meta,
.nav-row,
.result-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.palette-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.palette-list button {
  min-height: 38px;
  padding: 0;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
}

.palette-list button.is-active {
  color: #fff;
  background: var(--primary);
}

.palette-list button.is-answered {
  border-color: var(--green);
}

.palette-list button.is-marked {
  box-shadow: inset 0 -4px 0 var(--gold);
}

.question-card {
  min-height: 520px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.question-meta {
  color: var(--muted);
  font-weight: 800;
}

.question-card h2 {
  margin: 0;
  font-size: clamp(24px, 3.3vw, 42px);
  line-height: 1.22;
}

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

.choice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}

.choice:has(input:checked) {
  border-color: var(--primary);
  background: #f5f1ff;
}

.choice-key {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: var(--primary);
  background: #eee9ff;
  border-radius: 50%;
  font-weight: 900;
}

.review-toggle {
  color: var(--muted);
  font-weight: 800;
}

.results {
  display: grid;
  gap: 18px;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.score-grid div {
  padding: 18px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.score-grid strong {
  display: block;
  font-size: 34px;
}

.score-grid span {
  color: var(--muted);
  font-weight: 800;
}

.leaderboard {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.leaderboard-head,
.leaderboard-row {
  display: grid;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
}

.leaderboard-head {
  grid-template-columns: minmax(0, 1fr) auto;
  background: #f8fafc;
}

.leaderboard-head span,
.leaderboard-row span {
  color: var(--muted);
  font-weight: 800;
}

.leaderboard-row {
  grid-template-columns: 46px minmax(0, 1fr) 80px 86px;
  border-top: 1px solid var(--line);
}

.leaderboard-row b {
  color: var(--primary);
}

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

.review-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--muted);
  border-radius: 8px;
}

.review-item.is-correct {
  border-left-color: var(--green);
}

.review-item.is-wrong {
  border-left-color: var(--red);
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(360px, calc(100% - 36px));
  padding: 12px 14px;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(22, 28, 45, 0.18);
}

.is-hidden {
  display: none !important;
}

@media (max-width: 860px) {
  .hero,
  .exam-top,
  .exam-grid,
  .score-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 24px 18px;
  }

  .palette {
    position: static;
  }

  .leaderboard-head,
  .leaderboard-row {
    grid-template-columns: 1fr;
  }
}