:root {
  --text: #1a2332;
  --muted: #5b6b80;
  --link: #1668d8;
  --border: #e3e9f0;
  --bg: #ffffff;
  --bg-soft: #f5f8fb;
  --highlight: #fff8e6;
}
* { box-sizing: border-box; }
html { font-size: 17px; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
header.site {
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
header.site .wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
header.site a.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
header.site .tagline { color: var(--muted); font-size: 0.85rem; }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}
h1 { font-size: 1.65rem; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 2em 0 0.6em; padding-top: 0.4em; border-top: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 1.4em 0 0.4em; }
p { margin: 0.7em 0; }
a { color: var(--link); }
.meta { color: var(--muted); font-size: 0.85rem; margin-bottom: 1.2em; }
.answer-box {
  background: var(--highlight);
  border: 1px solid #f0e0b0;
  border-radius: 8px;
  padding: 14px 18px;
  margin: 1.2em 0;
}
.answer-box strong.t { display: block; margin-bottom: 6px; }
.answer-box ol, .answer-box ul { margin: 0; padding-left: 1.3em; }
ol.steps { padding-left: 1.3em; }
ol.steps li { margin: 0.55em 0; }
table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 0.95rem; }
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
th { background: var(--bg-soft); }
.note { color: var(--muted); font-size: 0.88rem; }
.warn { color: #9a5b00; }
details { border: 1px solid var(--border); border-radius: 8px; padding: 10px 16px; margin: 0.6em 0; }
details summary { font-weight: 600; cursor: pointer; }
details p { margin: 0.5em 0 0.3em; }
footer.site {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 0.82rem;
}
footer.site .wrap { max-width: 760px; margin: 0 auto; padding: 18px 20px; }
.guide-list { list-style: none; padding: 0; margin: 1em 0; }
.guide-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 0.7em 0;
}
.guide-list li a { font-weight: 600; text-decoration: none; font-size: 1.05rem; }
.guide-list li a:hover { text-decoration: underline; }
.guide-list .desc { color: var(--muted); font-size: 0.9rem; margin-top: 4px; }
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: #0a6b3c;
  background: #e2f5ea;
  border-radius: 4px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
}