:root {
  --accent: #c96442;
  --ink: #1f1e1d;
  --muted: #6e6a66;
  --paper: #faf9f7;
  --card: #ffffff;
  --line: #e5e1dc;
  --good: #1e7f4f;
  --good-bg: #e9f6ef;
  --bad: #b3382c;
  --bad-bg: #fbeeec;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
}
header {
  border-top: 6px solid var(--accent);
  border-bottom: 1px solid var(--line);
  background: var(--card);
  padding: 1.5rem 1rem;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 1rem; }
header h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
header p { margin: 0; color: var(--muted); font-size: .95rem; }
.scorebar {
  position: sticky; top: 0; z-index: 5;
  background: var(--card); border-bottom: 1px solid var(--line);
  padding: .5rem 1rem; font-size: .9rem; color: var(--muted);
}
.q {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 1.25rem 0;
  padding: 1.25rem 1.25rem 1rem;
}
.q .domain {
  font-family: -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-size: .75rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); margin-bottom: .35rem;
}
.q .stem { font-weight: bold; margin-bottom: .75rem; }
.opt {
  display: block; width: 100%; text-align: left;
  font: inherit; color: inherit;
  background: var(--paper);
  border: 1px solid var(--line); border-radius: 6px;
  padding: .6rem .8rem; margin: .4rem 0;
  cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt:disabled { cursor: default; opacity: .55; }
.opt.correct { background: var(--good-bg); border-color: var(--good); opacity: 1; }
.opt.wrong { background: var(--bad-bg); border-color: var(--bad); opacity: 1; }
.expl {
  border-radius: 6px; padding: .75rem .9rem; margin-top: .6rem;
  font-size: .95rem;
}
.expl.right { background: var(--good-bg); border: 1px solid var(--good); }
.expl.wrong { background: var(--bad-bg); border: 1px solid var(--bad); }
.expl .verdict { font-weight: bold; }
.expl.right .verdict { color: var(--good); }
.expl.wrong .verdict { color: var(--bad); }
.expl a { color: var(--accent); }
.retry {
  font: inherit; margin-top: .6rem;
  background: var(--accent); color: #fff;
  border: none; border-radius: 6px;
  padding: .45rem 1rem; cursor: pointer;
}
.retry:hover { filter: brightness(.92); }
.examnav {
  display: flex; justify-content: space-between; gap: 1rem;
  max-width: 760px; margin: 1rem auto 0; padding: 0 1rem;
  font-family: -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-size: .85rem;
}
.examnav a { color: var(--accent); text-decoration: none; }
.examnav a:hover { text-decoration: underline; }
.examnav .disabled { color: var(--line); }
footer { color: var(--muted); font-size: .85rem; padding: 1.5rem 1rem 3rem; text-align: center; }