:root {
  --navy: #0b2a4a;
  --navy-dark: #071b31;
  --accent: #17876d;
  --accent-soft: #e7f7f3;
  --ink: #182536;
  --muted: #61748a;
  --line: #d8e2ee;
  --surface: #ffffff;
  --background: #f6f9fc;
  --warning: #8a6514;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.8;
}
a { color: #2563a8; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
.site-header { color: white; background: linear-gradient(135deg, var(--navy-dark), var(--navy)); }
.header-inner, .page-shell, .site-footer-inner { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 76px; }
.brand { color: white; font-size: clamp(1rem, 3vw, 1.28rem); font-weight: 800; text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; gap: 14px; }
.site-nav a { color: #eef5ff; font-size: 0.92rem; text-decoration: none; }
.site-nav a:hover, .site-nav a:focus-visible { text-decoration: underline; }
.page-shell { padding: 26px 0 56px; }
.breadcrumbs { margin: 0 0 14px; color: var(--muted); font-size: 0.88rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li + li::before { margin-right: 8px; content: "/"; color: #9ca3af; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; align-items: start; }
.article-card, .side-card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 8px 24px rgba(7, 27, 49, 0.06); }
.article-card { padding: clamp(22px, 5vw, 48px); }
.article-kicker { margin: 0 0 8px; color: var(--accent); font-size: 0.82rem; font-weight: 800; letter-spacing: 0.08em; }
h1 { margin: 0; color: var(--navy); font-size: clamp(1.8rem, 5vw, 2.65rem); line-height: 1.35; letter-spacing: 0.01em; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 18px; margin: 16px 0 26px; color: var(--muted); font-size: 0.88rem; }
.summary { margin: 0 0 28px; padding: 16px 18px; background: var(--accent-soft); border-left: 5px solid var(--accent); border-radius: 8px; }
.article-body h2 { margin: 2.4em 0 0.8em; padding-bottom: 0.35em; color: var(--navy); font-size: clamp(1.35rem, 3vw, 1.65rem); border-bottom: 2px solid var(--line); }
.article-body h3 { margin: 1.8em 0 0.65em; color: var(--navy); font-size: 1.18rem; }
.article-body p { margin: 0 0 1.25em; }
.article-body ul, .article-body ol { margin: 0 0 1.4em; padding-left: 1.45em; }
.article-body li + li { margin-top: 0.45em; }
.article-body table { width: 100%; margin: 1.4em 0; border-collapse: collapse; font-size: 0.94rem; }
.article-body th, .article-body td { padding: 10px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-body th { color: var(--navy); background: #eef5ff; }
.side-card { position: sticky; top: 18px; padding: 20px; }
.side-card h2 { margin: 0 0 10px; color: var(--navy); font-size: 1.05rem; }
.side-card ul { margin: 0; padding-left: 1.2em; }
.side-card li + li { margin-top: 0.7em; }
.safety-note { margin-top: 28px; padding: 16px 18px; color: #5e460d; background: #fff6dd; border: 1px solid #ead69f; border-radius: 8px; font-size: 0.9rem; }
.site-footer { color: #dfe9f4; background: var(--navy-dark); }
.site-footer-inner { padding: 28px 0; font-size: 0.86rem; }
.site-footer a { color: white; }
.site-reform { --accent: #8a6514; --accent-soft: #fff6dd; }
@media (max-width: 820px) {
  .header-inner { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .article-layout { grid-template-columns: 1fr; }
  .side-card { position: static; }
}
@media (max-width: 520px) {
  .header-inner, .page-shell, .site-footer-inner { width: min(100% - 22px, 1080px); }
  .site-nav { gap: 8px 12px; }
  .article-card { padding: 20px 16px; border-radius: 10px; }
  .article-body table { display: block; overflow-x: auto; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }