:root {
  --detail-navy: #08265a;
  --detail-ink: #10283f;
  --detail-teal: #087c82;
  --detail-orange: #d55f00;
  --detail-paper: #fbfbf7;
  --detail-line: #c9d4da;
  --detail-muted: #4c5e69;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-block-start: 80px; }
body {
  margin: 0;
  background: var(--detail-paper);
  color: var(--detail-ink);
  font-family: "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
}
a { color: inherit; }
img { display: block; max-inline-size: 100%; }
.detail-shell { inline-size: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.detail-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 20;
  border-block-end: 1px solid var(--detail-line);
  background: rgb(251 251 247 / .96);
  backdrop-filter: blur(12px);
}
.detail-header-inner {
  min-block-size: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.detail-brand { display: flex; align-items: center; gap: 18px; text-decoration: none; }
.detail-brand img { inline-size: 165px; block-size: auto; }
.detail-brand span { border-inline-start: 1px solid var(--detail-line); padding-inline-start: 18px; font-size: 12px; font-weight: 700; }
.detail-nav { display: flex; align-items: center; gap: 22px; font-size: 13px; font-weight: 700; }
.detail-nav a { text-decoration: none; }
.detail-nav .detail-cta { border: 1px solid var(--detail-navy); padding: 9px 14px; }
.detail-image {
  inline-size: min(1080px, calc(100% - 96px));
  margin: 28px auto 0;
  border: 1px solid var(--detail-line);
  background: #fff;
  box-shadow: 0 14px 36px rgb(8 38 90 / .06);
}
.detail-image picture,
.detail-image img { inline-size: 100%; block-size: auto; }
.detail-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 16px 22px;
  border-block-start: 1px solid var(--detail-line);
  background: #f5f7f8;
}
.detail-button {
  display: inline-flex;
  min-block-size: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--detail-navy);
  background: var(--detail-navy);
  color: #fff;
  padding: 10px 20px;
  font-weight: 700;
  text-decoration: none;
}
.detail-button.secondary { background: #fff; color: var(--detail-navy); }
.detail-section { padding-block: 64px; border-block-end: 1px solid var(--detail-line); }
.detail-section.alt { background: #f2f5f4; }
.detail-kicker { color: var(--detail-teal); font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.detail-title { margin: 8px 0 16px; color: var(--detail-navy); font-size: clamp(30px, 4vw, 48px); line-height: 1.35; }
.detail-lead { max-inline-size: 820px; margin: 0; color: var(--detail-muted); font-size: 16px; }
.detail-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-block-start: 34px; border: 1px solid var(--detail-line); background: #fff; }
.detail-card { min-block-size: 210px; padding: 26px; border-inline-end: 1px solid var(--detail-line); }
.detail-card:last-child { border-inline-end: 0; }
.detail-card b { display: block; color: var(--detail-teal); font-size: 13px; }
.detail-card h2,
.detail-card h3 { margin: 10px 0; color: var(--detail-navy); font-size: 20px; line-height: 1.5; }
.detail-card p { margin: 0; color: var(--detail-muted); font-size: 14px; }
.detail-ledger { margin-block-start: 28px; border-block-start: 2px solid var(--detail-navy); }
.detail-ledger-row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px; padding: 20px 8px; border-block-end: 1px solid var(--detail-line); }
.detail-ledger-row dt { color: var(--detail-navy); font-weight: 800; }
.detail-ledger-row dd { margin: 0; color: var(--detail-muted); }
.detail-note { margin-block-start: 24px; border-inline-start: 4px solid var(--detail-orange); background: #fff5eb; padding: 18px 22px; color: #63300d; }
.detail-price { display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; margin-block-start: 26px; border-block: 2px solid var(--detail-navy); padding: 22px 8px; }
.detail-price strong { color: var(--detail-navy); font-size: 22px; }
.detail-price span { color: var(--detail-orange); font-weight: 800; }
.source-list { padding-inline-start: 1.2em; color: var(--detail-muted); }
.source-list a { color: var(--detail-navy); text-underline-offset: 4px; }
.detail-form { display: grid; gap: 18px; margin-block-start: 32px; border: 1px solid var(--detail-line); background: #fff; padding: 30px; }
.detail-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.detail-form label { display: grid; gap: 7px; color: var(--detail-navy); font-size: 13px; font-weight: 700; }
.detail-form input,
.detail-form select,
.detail-form textarea { inline-size: 100%; min-block-size: 48px; border: 0; border-block-end: 1px solid #8fa2ac; border-radius: 0; background: transparent; padding: 10px 4px; font: inherit; }
.detail-form textarea { min-block-size: 120px; resize: vertical; }
.detail-form-consent { display: flex !important; grid-template-columns: auto 1fr; align-items: start; gap: 10px !important; color: var(--detail-muted) !important; }
.detail-form-consent input { inline-size: 20px; min-block-size: 20px; margin-block-start: 4px; }
.detail-footer { padding-block: 32px; border-block-start: 1px solid var(--detail-line); background: #fff; color: var(--detail-muted); font-size: 12px; }
.detail-footer-inner { display: flex; justify-content: space-between; gap: 24px; }
.sr-only { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (max-width: 820px) {
  .detail-shell { inline-size: min(100% - 32px, 1120px); }
  .detail-header-inner { min-block-size: 62px; }
  .detail-brand img { inline-size: 140px; }
  .detail-brand span,
  .detail-nav a:not(.detail-cta) { display: none; }
  .detail-image { inline-size: calc(100% - 24px); margin-block-start: 12px; }
  .detail-actions { display: grid; grid-template-columns: 1fr; padding: 12px; }
  .detail-button { inline-size: 100%; }
  .detail-section { padding-block: 48px; }
  .detail-grid { grid-template-columns: 1fr; }
  .detail-card { min-block-size: 0; border-inline-end: 0; border-block-end: 1px solid var(--detail-line); }
  .detail-card:last-child { border-block-end: 0; }
  .detail-ledger-row { grid-template-columns: 1fr; gap: 5px; }
  .detail-price { grid-template-columns: 1fr; gap: 4px; }
  .detail-form-grid { grid-template-columns: 1fr; }
  .detail-form { padding: 22px 18px; }
  .detail-footer-inner { display: grid; }
}