:root {
  --ink: #24302b;
  --muted: #63706a;
  --paper: #fffdf8;
  --surface: #ffffff;
  --soft: #f3efe7;
  --line: #ded8ca;
  --accent: #9c5a49;
  --accent-dark: #764034;
  --moss: #607b6c;
  --brass: #b27c38;
  --max: 1120px;
  --radius: 22px;
  --shadow: 0 12px 34px rgba(36, 48, 43, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
a { color: var(--accent-dark); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.container { width: min(calc(100% - 32px), var(--max)); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,253,248,.96); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px); }
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { color: var(--ink); font-size: 1.25rem; font-weight: 800; text-decoration: none; letter-spacing: .02em; }
.nav { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; font-size: .94rem; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--accent-dark); }
.hero { padding: 72px 0 48px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(260px, .7fr); gap: 44px; align-items: center; }
.eyebrow { color: var(--accent-dark); font-weight: 800; letter-spacing: .08em; font-size: .82rem; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.35; letter-spacing: .01em; }
h1 { margin: 12px 0 20px; font-size: clamp(2rem, 5vw, 3.55rem); }
h2 { margin: 2.7em 0 .8em; font-size: clamp(1.45rem, 3vw, 2rem); }
h3 { margin: 2em 0 .6em; font-size: 1.18rem; }
.lead { font-size: 1.12rem; color: #3c4944; max-width: 760px; }
.hero-card, .card, .callout, .source-box, .cta-box, .check-card, .decision-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-card { padding: 28px; }
.hero-card strong { display: block; margin-bottom: 8px; }
.hero-card ul { margin-bottom: 0; padding-left: 1.25em; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border-radius: 999px; font-weight: 800; text-decoration: none; border: 1px solid var(--accent); }
.button.primary { color: white; background: var(--accent-dark); border-color: var(--accent-dark); }
.button.secondary { color: var(--accent-dark); background: transparent; }
.section { padding: 36px 0 64px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card { padding: 24px; }
.card h2, .card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.tag { display: inline-block; padding: 4px 10px; border-radius: 999px; background: var(--soft); color: var(--muted); font-size: .78rem; font-weight: 700; }
.breadcrumb { padding: 18px 0 0; font-size: .86rem; color: var(--muted); }
.breadcrumb a { color: inherit; }
.article-wrap { display: grid; grid-template-columns: minmax(0, 760px) minmax(220px, 1fr); gap: 48px; align-items: start; padding: 34px 0 80px; }
.article { min-width: 0; }
.article h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); }
.article .meta { color: var(--muted); font-size: .88rem; margin-bottom: 28px; }
.article p, .article li { font-size: 1rem; }
.article table { width: 100%; border-collapse: collapse; margin: 24px 0; background: white; }
.article th, .article td { border: 1px solid var(--line); padding: 12px 14px; text-align: left; vertical-align: top; }
.article th { background: var(--soft); }
.article ul, .article ol { padding-left: 1.4em; }
.callout { padding: 20px 22px; margin: 24px 0; background: #fbf7ef; box-shadow: none; }
.callout strong { color: var(--accent-dark); }
.checklist { list-style: none; padding: 0 !important; display: grid; gap: 10px; }
.checklist li { position: relative; padding: 12px 14px 12px 44px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.checklist li::before { content: "□"; position: absolute; left: 15px; top: 10px; font-size: 1.25rem; color: var(--moss); }
.check-card { padding: 22px; margin: 20px 0; box-shadow: none; }
.check-card h3 { margin-top: 0; }
.decision-card { padding: 22px; margin: 20px 0; box-shadow: none; border-left: 5px solid var(--moss); }
.source-box { padding: 22px; margin-top: 36px; box-shadow: none; background: #faf8f3; }
.source-box h2 { margin-top: 0; font-size: 1.2rem; }
.source-box ul { margin-bottom: 0; }
.cta-box { padding: 24px; margin: 36px 0; box-shadow: none; border-color: #cdb8a9; background: #fff9f4; }
.cta-box h2 { margin-top: 0; font-size: 1.35rem; }
.sidebar { position: sticky; top: 92px; }
.sidebar .card { box-shadow: none; }
.sidebar ul { padding-left: 1.2em; margin-bottom: 0; }
.site-footer { border-top: 1px solid var(--line); padding: 34px 0 46px; color: var(--muted); font-size: .88rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { color: var(--muted); }
.notice { color: var(--muted); font-size: .9rem; }
.guide-hero { padding: 54px 0 24px; }
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 32px 0; }
.guide-card { display: block; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: white; color: var(--ink); text-decoration: none; box-shadow: var(--shadow); }
.guide-card:hover { border-color: #c4aa9b; transform: translateY(-1px); }
.guide-card h2 { margin: 7px 0 8px; font-size: 1.2rem; }
.guide-card p { margin: 0; color: var(--muted); }
@media (max-width: 820px) {
  .hero-grid, .article-wrap { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .hero { padding-top: 48px; }
  .nav { gap: 11px; font-size: .85rem; }
}
@media (max-width: 560px) {
  .container { width: min(calc(100% - 24px), var(--max)); }
  .header-inner { align-items: flex-start; flex-direction: column; padding: 13px 0; gap: 8px; }
  .site-header { position: static; }
  .article-wrap { padding-top: 20px; }
  .article table { display: block; overflow-x: auto; white-space: normal; }
  .button { width: 100%; }
}