:root {
  color-scheme: light;
  --ink: #1f2933;
  --muted: #60707f;
  --line: #d9e3ea;
  --soft: #f5f8fa;
  --panel: #ffffff;
  --accent: #b4445a;
  --accent-dark: #813244;
  --blue: #286581;
  --green: #36715f;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.75;
  background: #fff;
}
a { color: inherit; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.94); position: sticky; top: 0; z-index: 10; }
.nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { font-weight: 800; color: var(--accent-dark); text-decoration: none; font-size: 20px; }
nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
nav a { text-decoration: none; }
.hero { padding: 56px 0 44px; background: linear-gradient(180deg, #fff7f7 0%, #f7fbfd 100%); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); gap: 32px; align-items: center; }
.eyebrow { display: inline-block; color: var(--accent-dark); font-weight: 700; font-size: 14px; margin-bottom: 10px; }
h1 { margin: 0 0 16px; font-size: clamp(32px, 5vw, 54px); line-height: 1.18; letter-spacing: 0; }
h2 { margin: 0 0 18px; font-size: 28px; line-height: 1.35; letter-spacing: 0; }
h3 { margin: 0 0 10px; font-size: 21px; line-height: 1.45; letter-spacing: 0; }
p { margin: 0 0 14px; }
.lead { color: var(--muted); font-size: 18px; max-width: 760px; }
.hero-panel { border: 1px solid var(--line); border-radius: 8px; background: rgba(255,255,255,.82); padding: 22px; }
.hero-panel ul { margin: 10px 0 0; padding-left: 20px; }
.section { padding: 48px 0; }
.section.alt { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card { display: block; min-height: 188px; padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); text-decoration: none; transition: border-color .15s ease, transform .15s ease; }
.card:hover { border-color: #b9c8d2; transform: translateY(-1px); }
.card strong { display: block; margin: 8px 0; font-size: 18px; line-height: 1.45; }
.card span:last-child { color: var(--muted); font-size: 14px; }
.tag { display: inline-block; color: var(--blue); font-size: 12px; font-weight: 700; }
.article { width: min(820px, calc(100% - 32px)); margin: 0 auto; }
.article-hero { padding: 42px 0 34px; background: #f7fbfd; border-bottom: 1px solid var(--line); }
.crumb { color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.note { border-left: 4px solid var(--accent); background: #fff7f7; padding: 16px 18px; margin: 24px 0; }
.checklist { display: grid; gap: 10px; padding: 0; margin: 18px 0 0; list-style: none; }
.checklist li { border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; background: #fff; }
.related { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.button { display: inline-block; text-decoration: none; background: var(--accent); color: #fff; border-radius: 8px; padding: 11px 16px; font-weight: 700; }
.button.secondary { background: #fff; color: var(--accent-dark); border: 1px solid var(--line); }
.faq { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 18px; }
.faq dt { font-weight: 800; margin-top: 18px; }
.faq dd { margin: 6px 0 0; color: var(--muted); }
.footer { padding: 36px 0; background: #24313a; color: #e8eef2; font-size: 14px; }
.updated { color: #b8c4cc; }
@media (max-width: 860px) {
  .hero-grid, .grid, .related { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  h1 { font-size: 34px; }
}