:root {
  color-scheme: light;
  --bg: #fffafa;
  --surface: #ffffff;
  --ink: #2d2624;
  --muted: #756b67;
  --line: #eadfdc;
  --accent: #a85d67;
  --accent-soft: #f7e8e8;
  --beige: #f7efe6;
  --focus: #7c5b49;
}
* { box-sizing: border-box; }
html, body { overflow-x: hidden; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
}
a { color: #884c56; text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 44px);
  background: rgba(255, 250, 250, .96);
  border-bottom: 1px solid var(--line);
}
.brand { flex: 0 0 auto; color: var(--ink); font-weight: 700; text-decoration: none; }
.global-nav { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: thin; white-space: nowrap; }
.global-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
}
.global-nav a[aria-current="page"], .global-nav a:hover { background: var(--accent-soft); }
main { width: min(1120px, 100%); margin: 0 auto; padding: 18px clamp(16px, 4vw, 44px) 48px; }
.breadcrumb { color: var(--muted); font-size: 13px; margin: 8px 0 18px; overflow-wrap: anywhere; }
.hero { padding: clamp(28px, 6vw, 58px) 0 clamp(26px, 5vw, 44px); border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 10px; color: var(--accent); font-weight: 700; font-size: 14px; }
h1 { margin: 0; max-width: 900px; font-size: clamp(30px, 4.4vw, 52px); line-height: 1.25; letter-spacing: 0; }
.lead { max-width: 820px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: clamp(24px, 5vw, 48px); align-items: start; padding-top: 34px; }
.article { min-width: 0; }
.content-section { padding: 24px 0; border-bottom: 1px solid var(--line); }
.content-section h2, .side-panel h2 { margin: 0 0 10px; font-size: 22px; line-height: 1.45; letter-spacing: 0; }
.content-section p, .note { margin: 0; color: #453b38; }
.note { padding: 18px; margin-top: 24px; background: var(--beige); border: 1px solid var(--line); border-radius: 8px; }
.side-panel { position: sticky; top: 84px; padding: 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.guide-grid { display: grid; gap: 10px; }
.guide-card { display: grid; gap: 4px; padding: 14px; background: #fffdfc; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); text-decoration: none; }
.guide-card:hover { border-color: #d4b9b3; background: #fff7f5; }
.guide-card span { font-weight: 700; }
.guide-card small { color: var(--muted); font-size: 13px; line-height: 1.6; }
.site-footer { padding: 30px clamp(16px, 4vw, 44px); background: #f4e9e3; border-top: 1px solid var(--line); }
.footer-links { width: min(1120px, 100%); margin: 0 auto; display: flex; flex-wrap: wrap; gap: 10px 16px; }
.site-footer p { width: min(1120px, 100%); margin: 18px auto 0; color: var(--muted); font-size: 13px; }
@media (max-width: 860px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .global-nav { width: 100%; }
  .layout { grid-template-columns: 1fr; }
  .side-panel { position: static; }
}
@media (max-width: 430px) {
  .site-header { padding: 12px 14px; }
  main { padding-inline: 14px; }
  .global-nav a { font-size: 13px; padding-inline: 9px; }
  h1 { font-size: 29px; }
  .lead { font-size: 16px; }
  .content-section h2, .side-panel h2 { font-size: 20px; }
}