/* N-Systems 下層ページ共通スタイル（about / blog）
   トップ（index.html）・legal.html のトーンに合わせています。ライト一色。 */

:root {
  --navy: #16223b;
  --navy-deep: #0f1726;
  --gold: #dcb878;
  --gold-mid: #c8a662;
  --gold-dim: #b8924a;
  --ink: #16223b;
  --muted: #5a6172;
  --soft: #7a8091;
  --line: #eef0f3;
  --panel: #f6f7f9;
  --warm: #f2f0ea;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--gold-dim); }

/* nav / footer の内側を本文テキストの開始位置（720px カラム内 padding 込み）に合わせる */
.pad-x { padding-left: max(20px, calc(50vw - 320px)); padding-right: max(20px, calc(50vw - 320px)); }

.eyebrow {
  font-family: Manrope, sans-serif;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-dim);
  font-weight: 700;
  text-transform: uppercase;
}
.serif { font-family: "Noto Serif JP", serif; font-weight: 700; }

/* ---- nav ---- */
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: baseline;
  justify-content: space-between;
  padding-top: clamp(16px, 3vw, 22px);
  padding-bottom: clamp(16px, 3vw, 22px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  font-family: Manrope, sans-serif;
  font-weight: 800;
  font-size: 22px;
  color: var(--navy);
  letter-spacing: -0.01em;
}
.brand span { color: var(--gold-dim); }
.nav-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 14px; font-weight: 600; }
.nav-links a { color: #45506a; }
.nav-links a.on { color: var(--navy); border-bottom: 2px solid var(--gold-mid); padding-bottom: 3px; }

/* ---- reading column ---- */
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(44px, 8vw, 76px) clamp(20px, 5vw, 40px) clamp(72px, 12vw, 120px);
}
.page-head { margin-bottom: clamp(36px, 6vw, 56px); }
.page-head h1 {
  font-family: "Noto Serif JP", serif;
  font-weight: 700;
  font-size: clamp(27px, 5vw, 38px);
  line-height: 1.4;
  margin: 14px 0 0;
  text-wrap: balance;
}
.page-head .sub {
  font-size: 15px;
  color: var(--muted);
  line-height: 2;
  margin: 18px 0 0;
}

/* ---- prose ---- */
.prose { font-size: 15.5px; line-height: 2.05; color: #3f4759; }
.prose > * + * { margin-top: 1.5em; }
.prose h2 {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(20px, 3.4vw, 25px);
  color: var(--navy);
  font-weight: 700;
  line-height: 1.5;
  margin-top: 2.4em;
  padding-top: 1.4em;
  border-top: 1px solid var(--line);
}
.prose h3 { font-size: 17px; font-weight: 700; color: var(--navy); margin-top: 2em; }
.prose strong { color: var(--navy); }
.prose a { color: var(--gold-dim); border-bottom: 1px solid #e4d3b4; }
.prose a:hover { border-bottom-color: var(--gold-dim); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.5em; }
.prose blockquote {
  margin: 1.8em 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--gold-mid);
  color: var(--muted);
}
.prose code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--panel);
  padding: 2px 6px;
  border-radius: 3px;
}
.prose pre {
  background: var(--navy-deep);
  color: #e7ebf3;
  padding: 18px 20px;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
}
.prose pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.prose figure { margin: 2em 0; }
.prose figcaption { font-size: 13px; color: var(--soft); margin-top: 8px; }

/* ---- profile facts ---- */
.facts { margin: 8px 0 0; border-top: 1px solid var(--line); }
.facts div {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.facts dt { font-size: 13.5px; font-weight: 700; margin: 0; color: var(--navy); }
.facts dd { font-size: 14.5px; line-height: 1.9; color: var(--muted); margin: 0; }

/* ---- blog list ---- */
.post-list { margin: 8px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.post-list li { list-style: none; }
.post-list a {
  display: block;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.post-list a:hover { color: var(--ink); }
.post-list a:hover .post-title { color: var(--gold-dim); }
.post-meta {
  font-family: Manrope, sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--soft);
  font-variant-numeric: tabular-nums;
}
.post-title {
  font-family: "Noto Serif JP", serif;
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 21px);
  color: var(--navy);
  line-height: 1.55;
  margin: 8px 0 0;
}
.post-excerpt { font-size: 14px; line-height: 1.9; color: var(--muted); margin: 10px 0 0; }
.tag {
  display: inline-block;
  font-family: Manrope, sans-serif;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold-dim);
  border: 1px solid #e4d3b4;
  border-radius: 999px;
  padding: 2px 10px;
  margin-left: 10px;
}

/* ---- article footer CTA ---- */
.cta {
  margin-top: clamp(56px, 9vw, 88px);
  background: var(--navy);
  color: #fff;
  border-radius: 4px;
  padding: clamp(28px, 5vw, 40px);
}
.cta h2 {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(19px, 3vw, 23px);
  margin: 0;
  border: 0;
  padding: 0;
  color: #fff;
}
.cta p { font-size: 14px; line-height: 1.95; color: #c8cfdd; margin: 14px 0 0; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 22px;
  background: var(--gold-mid);
  color: var(--navy);
  font-weight: 700;
  font-size: 14.5px;
  padding: 14px 28px;
  border-radius: 2px;
  transition: background .18s ease, transform .18s ease;
}
.btn:hover { background: var(--gold); color: var(--navy); transform: translateY(-1px); }

.back {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #45506a;
}
.article-nav { margin-top: 48px; font-size: 14px; font-weight: 600; }
.article-nav a { color: var(--gold-dim); }

/* ---- footer ---- */
.site-footer {
  background: var(--navy-deep);
  color: #8b94a8;
  padding: 30px max(20px, calc(50vw - 320px));
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.site-footer .brand { color: #fff; font-size: 16px; }
.site-footer .brand span { color: var(--gold-mid); }
.site-footer a { color: #aab2c2; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }

@media (max-width: 560px) {
  .facts div { grid-template-columns: 1fr; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}