:root {
  color-scheme: light;
  --bg: #fffafa;
  --paper: #ffffff;
  --ink: #342b2c;
  --muted: #75696b;
  --line: #eadbdd;
  --accent: #b66f78;
  --accent-dark: #7e3f47;
  --soft: #f8ecee;
  --sage: #eef4ef;
}
* { box-sizing: border-box; }
html { overflow-x: hidden; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.85;
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
}
a { color: var(--accent-dark); text-decoration-thickness: .08em; text-underline-offset: .18em; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(16px, 4vw, 48px);
  background: rgba(255,250,250,.95);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  flex: 0 0 auto;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.04rem;
  text-decoration: none;
}
.global-nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}
.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 { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.breadcrumbs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 18px 0 0;
  color: var(--muted);
  font-size: .88rem;
}
.breadcrumbs a::after { content: "/"; margin-left: 8px; color: #b8aaad; }
.hero {
  padding: clamp(34px, 8vw, 72px) 0 clamp(28px, 5vw, 48px);
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--accent-dark);
  font-size: .88rem;
}
h1 {
  max-width: 900px;
  margin: 0 0 18px;
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  line-height: 1.25;
  letter-spacing: 0;
}
.hero p:last-child {
  max-width: 860px;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: clamp(24px, 5vw, 48px);
  padding: 34px 0 56px;
  align-items: start;
}
.article { min-width: 0; }
.content-section {
  padding: 0 0 28px;
  margin: 0 0 28px;
  border-bottom: 1px solid var(--line);
}
h2 {
  margin: 0 0 12px;
  font-size: 1.35rem;
  line-height: 1.45;
  letter-spacing: 0;
}
p { margin: 0 0 1em; }
.content-section p, details p, .side-panel p, .note p { color: var(--muted); }
details {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px 15px;
  margin: 10px 0;
}
summary {
  cursor: pointer;
  font-weight: 700;
  line-height: 1.55;
}
details p { margin: 10px 0 0; }
.side-panel, .note {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
.side-panel {
  position: sticky;
  top: 92px;
}
.side-panel h2, .note h2 { font-size: 1.05rem; }
ul { padding-left: 1.2em; margin: 0; }
li { margin: 8px 0; }
.note { background: var(--sage); margin: 4px 0 28px; }
.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 28px;
  padding: 32px clamp(16px, 4vw, 48px);
  background: #3c3032;
  color: #fffafa;
}
.site-footer p { color: #eadbdd; margin: 8px 0 0; }
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-content: start;
}
.site-footer a { color: #fffafa; }
@media (max-width: 780px) {
  .site-header { display: block; padding: 14px 16px; }
  .brand { display: inline-block; margin-bottom: 10px; }
  main { width: min(100% - 28px, 1120px); }
  .layout, .site-footer { grid-template-columns: 1fr; }
  .side-panel { position: static; }
  h1 { font-size: 2rem; }
}
@media (max-width: 420px) {
  main { width: min(100% - 24px, 1120px); }
  .global-nav a { font-size: .84rem; padding-inline: 8px; }
  .hero { padding-top: 28px; }
  h1 { font-size: 1.78rem; }
  .side-panel, .note, details { border-radius: 6px; }
}