:root {
  color-scheme: light dark;
  --bg: #101624;
  --card: #182235;
  --text: #eef4ff;
  --muted: #aab8cf;
  --line: #30415f;
  --accent: #7dd3fc;
  --good: #34d399;
  --bad: #fb7185;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #1f3b57, var(--bg) 42rem);
  color: var(--text);
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 0.95;
}

.hero p:last-child {
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.1rem;
}

.card {
  padding: clamp(20px, 4vw, 36px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: color-mix(in srgb, var(--card) 92%, transparent);
  box-shadow: 0 24px 80px rgb(0 0 0 / 28%);
}

.status,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
}

.status {
  margin-bottom: 28px;
  color: var(--muted);
}

.options {
  display: grid;
  gap: 12px;
  margin: 28px 0;
}

button,
.feedback a {
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
}

button {
  cursor: pointer;
  color: var(--text);
  background: #263650;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.option {
  width: 100%;
  padding: 18px 20px;
  text-align: left;
  border: 1px solid var(--line);
}

.option:hover:not(:disabled) {
  border-color: var(--accent);
}

.option.correct {
  background: color-mix(in srgb, var(--good) 24%, #203047);
  border-color: var(--good);
}

.option.wrong {
  background: color-mix(in srgb, var(--bad) 24%, #203047);
  border-color: var(--bad);
}

.feedback {
  margin-bottom: 24px;
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: #121b2b;
}

.feedback p {
  margin: 8px 0 14px;
  color: var(--muted);
}

.feedback a {
  display: inline-flex;
  padding: 10px 14px;
  color: #07111f;
  background: var(--accent);
  text-decoration: none;
}

.actions button {
  padding: 12px 18px;
}

#next {
  background: var(--accent);
  color: #07111f;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 920px);
    padding: 24px 0;
  }

  .card {
    border-radius: 22px;
  }
}