:root {
  --bg: #fffafb;
  --paper: #ffffff;
  --ink: #342c2f;
  --muted: #75676d;
  --line: #eadde2;
  --soft: #f8edf1;
  --soft-2: #f3e7dc;
  --accent: #bd6f87;
  --accent-dark: #7f4055;
}
* { box-sizing: border-box; }
html, body { margin: 0; overflow-x: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.85;
  letter-spacing: 0;
}
a { color: var(--accent-dark); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255, 250, 251, .96);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}
.global-nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.global-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: .9rem;
}
.global-nav a[aria-current="page"], .global-nav a:hover {
  background: var(--soft);
  color: var(--accent-dark);
}
main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px;
}
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: .9rem;
  margin: 10px 0 18px;
}
.breadcrumbs a { text-decoration: none; }
.breadcrumbs span::before { content: "/"; margin-right: 8px; color: #b9a8ae; }
.hero {
  padding: 34px 0 28px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-weight: 700;
  font-size: .92rem;
}
h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 3.5vw, 3.25rem);
  line-height: 1.28;
}
.hero p:last-child {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.06rem;
}
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 26px;
  align-items: start;
  padding: 28px 0 44px;
}
.article, .side section {
  min-width: 0;
}
.content-section {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.content-section h2, .side h2 {
  margin: 0 0 10px;
  font-size: 1.28rem;
  line-height: 1.45;
}
.content-section p, .side p {
  margin: 0;
  color: var(--muted);
}
.support-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--soft);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
}
.side {
  display: grid;
  gap: 18px;
}
.side section {
  padding: 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.side ul {
  margin: 0;
  padding-left: 1.1em;
}
.side li { margin: 6px 0; }
details {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 10px 0;
}
summary {
  cursor: pointer;
  font-weight: 700;
}
details p { margin-top: 8px; }
.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 24px 18px 34px;
  display: grid;
  grid-template-columns: minmax(0, 330px) minmax(0, 1fr);
  gap: 24px;
}
.site-footer > * {
  max-width: 1120px;
}
.site-footer p {
  margin: 6px 0 0;
  color: var(--muted);
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-content: start;
}
@media (max-width: 780px) {
  .header-inner {
    display: block;
    padding-inline: 14px;
  }
  .brand {
    display: inline-block;
    margin-bottom: 8px;
  }
  main { padding-inline: 14px; }
  .layout { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  h1 { font-size: 2rem; }
  .global-nav a { font-size: .84rem; padding-inline: 8px; }
  .hero { padding-top: 22px; }
}