:root {
  --bg: #f7f7fb;
  --card: #ffffff;
  --ink: #172033;
  --muted: #5d6678;
  --line: #d7dcea;
  --accent: #0b3a78;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}
a { color: var(--accent); }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
}
.brand { font-weight: 800; text-decoration: none; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
main { max-width: 1050px; margin: 0 auto; padding: 2rem 1rem; }
footer { max-width: 1050px; margin: 0 auto; padding: 2rem 1rem; color: var(--muted); }
.hero, .card, .box, .answer {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.hero h1 { margin-top: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.question-list { list-style: none; margin: 0; padding: 0; }
.question-list li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 1rem;
  margin-bottom: 0.8rem;
}
.pill, .tag {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
  font-size: 0.85rem;
  margin: 0.15rem 0.2rem 0.15rem 0;
  background: #eef3fb;
  text-decoration: none;
}
.muted { color: var(--muted); }
.options { padding-left: 1.25rem; }
.answer summary { cursor: pointer; font-weight: 700; color: var(--accent); }
table { border-collapse: collapse; width: 100%; background: white; }
th, td { border: 1px solid var(--line); padding: 0.55rem; text-align: left; vertical-align: top; }
th { background: #e9f3fb; }
.choice-cell { min-width: 7rem; height: 2.5rem; }
img { max-width: 100%; height: auto; border: 1px solid var(--line); border-radius: 0.4rem; }
figcaption { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }
dl { display: grid; grid-template-columns: 10rem 1fr; gap: 0.4rem 1rem; }
dt { font-weight: 700; }
select[disabled] { font: inherit; padding: 0.1rem 1.5rem 0.1rem 0.2rem; }
pre { overflow-x: auto; background: #101827; color: #f5f7fb; padding: 1rem; border-radius: 0.5rem; }
@media (max-width: 620px) {
  .site-header { display: block; }
  nav { margin-top: 0.75rem; }
  dl { grid-template-columns: 1fr; }
}