:root {
  --ink: #1c2430;
  --muted: #5c6675;
  --paper: #f3efe6;
  --card: #fffdf8;
  --line: #e2d8c8;
  --green: #1f6b4a;
  --green-dark: #14382c;
  --amber: #9a6230;
  --bad: #8d2f2f;
  --good-bg: #e5f3eb;
  --bad-bg: #f8e8e4;
  --shadow: 0 12px 30px rgba(28, 36, 48, 0.06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.6 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--green-dark); }
.top {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 16px 28px;
  background: var(--green-dark);
  color: #f6f3ec;
}
.top a, .top button.linkish { color: #f6f3ec; text-decoration: none; }
.brand { font-weight: 700; letter-spacing: 0.04em; }
.top nav { display: flex; gap: 16px; flex: 1; }
.top button.linkish {
  background: transparent;
  border: 0;
  cursor: pointer;
  font: inherit;
}
main { max-width: 980px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 12px; }
h2 { margin-top: 28px; }
.eyebrow { letter-spacing: 0.12em; text-transform: uppercase; color: var(--amber); font-size: 13px; margin: 0; }
.lede, .muted { color: var(--muted); }
.hero { max-width: 720px; }
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
}
.card span { color: var(--amber); font-size: 13px; }
.card strong { display: block; font-size: 22px; margin: 6px 0; }
.card p { margin: 0; color: var(--muted); }
.summary { display: flex; gap: 28px; margin: 28px 0; }
.summary b { display: block; font-size: 28px; }
.summary span { color: var(--muted); }
.narrow { max-width: 560px; }
.stack { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-weight: 600; }
label.check { font-weight: 500; display: flex; align-items: center; gap: 8px; }
input[type="text"], input[type="password"], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: white;
  font: inherit;
}
button, .textlink {
  background: var(--green);
  color: white;
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.stack button[type="submit"] {
  width: 100%;
  min-height: 48px;
}
.banner {
  background: var(--bad-bg);
  color: var(--bad);
  border-radius: 12px;
  padding: 12px 14px;
  font-weight: 700;
}
.banner .errorlist { margin: 0; padding-left: 18px; }
.errorlist, .error, .messages { color: var(--bad); padding-left: 18px; }
.question { background: var(--card); border-radius: 18px; padding: 28px; box-shadow: var(--shadow); }
.meta, .hint { color: var(--muted); }
.options { display: grid; gap: 10px; }
.opt {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
  font-weight: 500;
}
.opt.is-correct { background: var(--good-bg); border-color: #9dccb0; }
.opt.is-wrong { background: var(--bad-bg); border-color: #e3b2aa; }
.verdict { font-weight: 700; }
.verdict.good { color: var(--green); }
.verdict.bad { color: var(--bad); }
.explain { white-space: pre-wrap; }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.wrong-list { list-style: none; padding: 0; display: grid; gap: 12px; }
.wrong-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  background: var(--card);
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--line);
}
.wrong-list p { margin: 6px 0; }
.inline { display: flex; gap: 16px; padding: 0; list-style: none; }
@media (max-width: 720px) {
  .cards, .top { display: grid; }
  .top nav { flex-wrap: wrap; }
  .wrong-list li { display: grid; }
}