:root {
  --accent: #1f6a4d;
  --accent-deep: #123f2e;
  --accent-soft: #e7f1e8;
  --text: #1c231d;
  --muted: #5b6a58;
  --line: #d9e2d5;
  --surface: #ffffff;
  --shadow-soft: 0 4px 14px rgba(16, 32, 22, .07);
  font-family: "Yu Gothic UI", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: #f5f7f3; line-height: 1.8; }
a { color: var(--accent-deep); }
a:focus-visible, summary:focus-visible { outline: 3px solid rgba(31, 106, 77, .35); outline-offset: 3px; }
.guideSiteHeader {
  min-height: 58px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 18px;
  background: white;
  border-bottom: 1px solid var(--line);
}
.guideBrand { font-weight: 800; text-decoration: none; color: var(--text); }
.guideHeaderLink, .guideCta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  font-weight: 700;
}
.guideHeaderLink:hover, .guideCta:hover { background: var(--accent-deep); }
.guideHeaderLink, .guideCta { box-shadow: 0 2px 8px rgba(18, 63, 46, .18); transition: background .15s ease, box-shadow .15s ease, transform .1s ease; }
.guideHeaderLink:active, .guideCta:active { transform: translateY(1px); }
.guideMain { max-width: 920px; margin: 0 auto; padding: 20px 18px 48px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0 0 12px; font-size: .86rem; }
.breadcrumb li:not(:last-child)::after { content: ">"; margin-left: 8px; color: var(--muted); }
.operationDisclosure { color: var(--muted); font-size: .8rem; }
.guideDocument { padding: 28px; background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow-soft); }
.guideTitle { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0; color: var(--accent-deep); font-size: .78rem; font-weight: 800; letter-spacing: .06em; }
h1 { margin: 4px 0 10px; line-height: 1.35; }
h2 { margin-top: 34px; line-height: 1.45; }
li + li { margin-top: 6px; }
code { padding: 2px 6px; border-radius: 6px; background: var(--accent-soft); }
details { margin: 10px 0; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
summary { cursor: pointer; font-weight: 700; }
.guideDocumentFooter { margin-top: 38px; padding-top: 24px; border-top: 1px solid var(--line); text-align: center; }
.recommendationSection { padding: 4px 18px 18px; margin-top: 36px; border-radius: 16px; background: #f3f6f2; }
@media (max-width: 620px) {
  .guideSiteHeader { padding: 8px 12px; }
  .guideMain { padding: 14px 12px 36px; }
  .guideDocument { padding: 20px 16px; }
  .guideHeaderLink { padding-inline: 12px; font-size: .9rem; }
}