:root {
  color-scheme: light;
  --ink: #143544;
  --muted: #617984;
  --line: #dce9ec;
  --surface: #fff;
  --soft: #f2f9fa;
  --blue: #147d96;
  --blue-dark: #0c5e73;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { min-width: 0; background: #f7fbfb; scroll-behavior: smooth; }
body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  background: radial-gradient(circle at 10% 0%, rgba(204, 240, 245, .55), transparent 32rem), #f7fbfb;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
}
a { color: var(--blue-dark); text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid #f3ad69; outline-offset: 3px; }
.article-shell { width: min(880px, calc(100% - 36px)); margin: 0 auto; padding: 22px 0 54px; }
.article-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); font-weight: 800; text-decoration: none; }
.privacy-note { color: var(--muted); font-size: 13px; }
.breadcrumbs { margin: 22px 0 30px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { color: inherit; }
.article-hero { padding: 22px 0 30px; }
.eyebrow { margin: 0 0 8px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
h1, h2, h3 { line-height: 1.4; }
h1 { max-width: 780px; margin: 0 0 14px; font-size: clamp(30px, 5.5vw, 48px); letter-spacing: -.035em; }
.lead { max-width: 740px; margin: 0; color: #385966; font-size: clamp(17px, 2.5vw, 19px); }
.article-note { margin: 22px 0 0; padding: 14px 16px; border-left: 4px solid #69c5d5; border-radius: 0 12px 12px 0; background: var(--soft); color: #345661; font-size: 14px; }
.article-body { display: grid; gap: 22px; }
.content-card { padding: clamp(18px, 4vw, 28px); border: 1px solid var(--line); border-radius: 20px; background: rgba(255, 255, 255, .92); box-shadow: 0 10px 28px rgba(35, 91, 105, .055); }
.content-card h2 { margin: 0 0 14px; font-size: clamp(21px, 3.5vw, 27px); }
.content-card h3 { margin: 22px 0 6px; font-size: 18px; }
.content-card p { margin: 10px 0; }
.content-card p:last-child { margin-bottom: 0; }
.content-card ul, .content-card ol { padding-left: 1.45rem; }
.content-card li + li { margin-top: 7px; }
.sample-box { padding: 18px; border: 1px solid #c8e5e9; border-radius: 14px; background: linear-gradient(135deg, #f2fbfb, #f7fbfb); }
.sample-box > :first-child { margin-top: 0; }
.sample-box > :last-child { margin-bottom: 0; }
.sample-label { display: inline-block; margin-bottom: 8px; padding: 2px 8px; border-radius: 999px; background: #d9f4f0; color: #1a665f; font-size: 12px; font-weight: 800; }
.table-wrap { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; background: var(--surface); font-size: 14px; }
th, td { padding: 11px 13px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--soft); font-weight: 800; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
.table-wrap th:first-child { min-width: 110px; }
.callout { padding: 14px 16px; border-radius: 13px; background: #fff5eb; color: #664a35; }
.callout strong { color: #51391f; }
.link-list { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.link-list a { display: inline-flex; min-height: 44px; align-items: center; gap: 8px; font-weight: 700; }
.article-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.article-footer a { min-height: 44px; display: inline-flex; align-items: center; }
.source-note { color: var(--muted); font-size: 13px; }
@media (max-width: 560px) {
  .article-shell { width: min(100% - 24px, 880px); padding-top: 12px; }
  .article-header { align-items: flex-start; flex-direction: column; gap: 2px; }
  .breadcrumbs { margin: 16px 0 20px; }
  .article-hero { padding: 14px 0 20px; }
  .table-wrap { overflow: visible; border: 0; }
  table, tbody, tr, th, td { display: block; width: 100%; }
  tr { margin-bottom: 10px; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; }
  th, td { border-bottom: 1px solid var(--line); }
  td:last-child { border-bottom: 0; }
  .article-footer { flex-direction: column; gap: 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }