:root {
  --ink: #141821;
  --body: #22262e;
  --sub: #3a3f49;
  --muted: #5a5f69;
  --line: #dcd9d2;
  --paper: #f4f3ef;
  --accent: #1f5c4a;
  --accent-dark: #143d31;
  --serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: #fff; color: var(--ink); font-family: var(--sans); line-height: 1.7; }
a { color: var(--accent); }
a:hover { color: var(--accent-dark); }
img, svg { max-width: 100%; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.serif { font-family: var(--serif); }
.kicker { margin: 0; font-size: 12px; font-weight: 700; letter-spacing: .12em; color: var(--accent); }
.date { margin: 0; font-size: 13px; color: var(--muted); }

/* ヘッダー・フッター */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 32px; padding-top: 14px; padding-bottom: 6px; }
.brand { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 12px; color: var(--ink); text-decoration: none; padding: 4px 0; }
.brand b { font-family: var(--serif); font-size: 26px; letter-spacing: .06em; }
.brand span { font-size: 12px; color: var(--muted); letter-spacing: .08em; }
.gnav { display: flex; flex-wrap: wrap; gap: 0 24px; font-size: 14px; font-weight: 500; }
.gnav a { color: var(--ink); text-decoration: none; padding: 12px 0; border-bottom: 2px solid transparent; }
.gnav a:hover, .gnav a[aria-current] { color: var(--accent); border-bottom-color: var(--accent); }
.site-footer { margin-top: 112px; background: var(--ink); color: #d9dce1; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px 32px; padding-top: 48px; padding-bottom: 24px; }
.site-footer b { display: block; font-family: var(--serif); font-size: 22px; letter-spacing: .06em; color: #fff; }
.site-footer small, .site-footer .copy { font-size: 12px; color: #a9aeb7; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0 24px; font-size: 13px; }
.site-footer nav a { color: #d9dce1; text-decoration: none; padding: 12px 0; }
.site-footer .copy { padding-bottom: 32px; }

/* 共通 */
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; font-size: 13px; color: var(--muted); }
.crumbs a { color: var(--muted); }
.rule-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; border-top: 2px solid var(--ink); padding-top: 16px; margin: 0 0 28px; }
.rule-head h2 { margin: 0; font-family: var(--serif); font-size: 22px; }
.rule-head a { font-size: 14px; font-weight: 500; padding: 12px 0; }
.thumb { display: flex; align-items: center; justify-content: center; aspect-ratio: 3 / 2; }
.thumb svg { width: 62%; height: auto; }
.m-bridge { background: #e6ede8; } .m-stairs { background: #e6ede8; } .m-scale { background: #f1ebdb; }
.m-key { background: #e4e7ec; } .m-sprout { background: #f1ebdb; } .m-door { background: #e4e7ec; }
.m-compass { background: #e6ede8; } .m-hourglass { background: #f1ebdb; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 48px 32px; }
.card { display: flex; flex-direction: column; gap: 12px; color: var(--ink); text-decoration: none; }
.card .title { margin: 0; font-family: var(--serif); font-size: 18px; line-height: 1.6; }
.card:hover .title { color: var(--accent); }

.banner { display: flex; flex-wrap: wrap; align-items: center; gap: 20px 24px; padding: 28px 32px; background: var(--accent); color: #fff; text-decoration: none; }
.banner:hover { color: #fff; background: var(--accent-dark); }
.banner .copy-block { flex: 1 1 360px; min-width: 0; }
.banner .label { margin: 0 0 6px; font-size: 12px; letter-spacing: .12em; opacity: .85; }
.banner .head { margin: 0 0 6px; font-family: var(--serif); font-size: 22px; line-height: 1.6; }
.banner .text { margin: 0; font-size: 14px; line-height: 1.8; opacity: .92; }
.banner .cta { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border: 1px solid #fff; font-size: 14px; font-weight: 700; }

/* 記事 */
.post-head { max-width: 820px; padding: 40px 0 32px; }
.post-head h1 { margin: 16px 0 24px; font-family: var(--serif); font-size: 40px; line-height: 1.45; letter-spacing: .01em; }
.post-head .lead { margin: 0 0 28px; font-size: 18px; line-height: 1.9; color: var(--sub); }
.meta { display: flex; flex-wrap: wrap; gap: 6px 20px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; }
.hero { margin: 0 0 56px; }
.hero .thumb { aspect-ratio: 15 / 7; }
.hero .thumb svg { width: 44%; }
.post-grid { display: flex; flex-wrap: wrap; gap: 56px; align-items: flex-start; }
.post-body { flex: 999 1 560px; min-width: 0; max-width: 700px; font-size: 17px; line-height: 2.05; color: var(--body); }
.post-body p { margin: 0 0 28px; }
.post-body h2 { margin: 56px 0 20px; font-family: var(--serif); font-size: 26px; line-height: 1.5; color: var(--ink); scroll-margin-top: 24px; }
.post-body h3 { margin: 40px 0 16px; font-family: var(--serif); font-size: 20px; line-height: 1.5; color: var(--ink); }
.post-body ul, .post-body ol { margin: 0 0 28px; padding-left: 1.4em; }
.post-body blockquote { margin: 48px 0; padding: 20px 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 22px; line-height: 1.7; color: var(--ink); }
.post-body blockquote p { margin: 0; }
.post-body table { width: 100%; border-collapse: collapse; margin: 0 0 28px; font-size: 15px; display: block; overflow-x: auto; }
.post-body th, .post-body td { border-bottom: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.post-body .sources { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 13px; line-height: 1.9; color: var(--muted); }
.post-body .sources h2 { margin: 0 0 8px; font-family: var(--sans); font-size: 13px; color: var(--sub); }
.post-body .sources ul { margin: 0; padding-left: 1.2em; }
.post-body .sources a { color: var(--muted); }
.post-body .disclaimer { margin-top: 32px; font-size: 12px; line-height: 1.8; color: var(--muted); }
.toc { flex: 1 1 280px; min-width: 0; max-width: 360px; border-top: 2px solid var(--ink); padding-top: 16px; }
.toc p { margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: .1em; }
.toc ol { margin: 0; padding-left: 20px; font-size: 14px; line-height: 1.9; color: var(--sub); }
.toc li { padding: 6px 0; }
.toc a { color: var(--sub); text-decoration: none; }
.toc a:hover { color: var(--accent); }
.post-foot { max-width: 820px; margin-top: 72px; }
.author { margin-top: 40px; padding: 24px; background: var(--paper); font-size: 13px; line-height: 1.9; color: var(--sub); }
.author b { display: block; color: var(--ink); }
.related { margin-top: 80px; }

/* トップ */
.feature { display: flex; flex-wrap: wrap; gap: 32px 40px; align-items: center; padding: 48px 0 56px; border-bottom: 1px solid var(--line); }
.feature .thumb-link { flex: 3 1 480px; min-width: 0; display: block; }
.feature .thumb { aspect-ratio: 12 / 7; }
.feature .thumb svg { width: 50%; }
.feature .text { flex: 2 1 320px; min-width: 0; }
.feature h1 { margin: 16px 0 20px; font-family: var(--serif); font-size: 34px; line-height: 1.5; }
.feature h1 a { color: var(--ink); text-decoration: none; }
.feature h1 a:hover { color: var(--accent); }
.feature .lead { margin: 0 0 20px; font-size: 16px; line-height: 1.9; color: var(--sub); }
.section { padding: 56px 0 0; }
.cat-cols { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 40px 32px; }
.cat-col { border-top: 2px solid var(--ink); padding-top: 16px; }
.cat-col h2 { margin: 0 0 6px; font-family: var(--serif); font-size: 20px; }
.cat-col h2 a { color: var(--ink); text-decoration: none; }
.cat-col .desc { margin: 0 0 16px; font-size: 13px; line-height: 1.8; color: var(--muted); }
.cat-col .item { display: block; padding: 12px 0; border-top: 1px solid var(--line); font-size: 15px; line-height: 1.7; color: var(--body); text-decoration: none; }
.cat-col .item:hover { color: var(--accent); }

/* カテゴリ */
.cat-head { max-width: 820px; padding: 40px 0; border-bottom: 2px solid var(--ink); }
.cat-head h1 { margin: 0 0 16px; font-family: var(--serif); font-size: 40px; line-height: 1.4; }
.cat-head p { margin: 0; font-size: 16px; line-height: 1.9; color: var(--sub); }
.list-grid { display: flex; flex-wrap: wrap; gap: 56px; align-items: flex-start; padding-top: 16px; }
.list { flex: 999 1 560px; min-width: 0; }
.row { display: flex; flex-wrap: wrap; gap: 20px 28px; padding: 28px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.row .thumb { flex: 0 0 220px; }
.row .text { flex: 1 1 280px; min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.row .title { margin: 0; font-family: var(--serif); font-size: 21px; line-height: 1.55; }
.row:hover .title { color: var(--accent); }
.row .desc { margin: 0; font-size: 14px; line-height: 1.85; color: var(--sub); }
.pager { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 40px; font-size: 14px; }
.pager a, .pager span { min-width: 44px; height: 44px; padding: 0 14px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.pager [aria-current] { background: var(--ink); border-color: var(--ink); color: #fff; }
.side { flex: 1 1 280px; min-width: 0; max-width: 360px; display: flex; flex-direction: column; gap: 40px; }
.side .box { border-top: 2px solid var(--ink); padding-top: 16px; }
.side .box p { margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: .1em; }
.side .box a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--body); text-decoration: none; font-size: 15px; }
.side .banner { padding: 24px; }
.side .banner .head { font-size: 19px; }

/* 固定ページ */
.page-body { max-width: 760px; padding: 40px 0 0; font-size: 16px; line-height: 2; color: var(--body); }
.page-body h1 { font-family: var(--serif); font-size: 34px; line-height: 1.5; margin: 0 0 32px; color: var(--ink); }
.page-body h2 { font-family: var(--serif); font-size: 22px; margin: 40px 0 12px; color: var(--ink); }

@media (max-width: 640px) {
  .post-head h1, .cat-head h1 { font-size: 28px; }
  .feature h1 { font-size: 26px; }
  .post-body { font-size: 16px; }
  .post-body h2 { font-size: 22px; }
  .row .thumb { flex-basis: 100%; }
  .banner { padding: 24px; }
}