:root { --bg:#fffafb; --paper:#fff; --ink:#342c2f; --muted:#75676d; --line:#eadde2; --soft:#f8edf1; --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 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; } }