/* ===== ホームページ工務店 コラム 共有スタイル ===== */
:root {
  --navy: #0a1937;
  --navy-deep: #050d1f;
  --navy-mid: #122a52;
  --kinari: #f5f3ee;
  --kinari-warm: #ebe6db;
  --gold: #c9a961;
  --gold-soft: #a88a45;
  --gold-deep: #8a6f33;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --line: rgba(10, 25, 55, 0.12);
  --line-light: rgba(245, 243, 238, 0.18);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Noto Sans JP", "Hiragino Sans", sans-serif;
  background: var(--kinari);
  color: var(--ink-soft);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* ─── Header ─── */
header.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 32px;
  background: rgba(10, 25, 55, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-light);
}
header.site-header .inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 12px; color: var(--kinari); }
.logo-mark {
  width: 38px; height: 38px;
  border: 1.5px solid var(--gold);
  display: grid; place-items: center;
  color: var(--gold);
  font-family: "Noto Serif JP", serif;
  font-weight: 700; font-size: 20px;
}
.logo-text { line-height: 1.2; }
.logo-text .ja { font-family: "Noto Serif JP", serif; font-size: 16px; font-weight: 600; letter-spacing: 0.08em; }
.logo-text .en { font-family: "Cormorant Garamond", serif; font-style: italic; font-size: 11px; color: var(--gold); letter-spacing: 0.12em; }
nav.main-nav { display: flex; gap: 28px; align-items: center; }
nav.main-nav a { color: var(--kinari); font-size: 13px; letter-spacing: 0.08em; padding: 4px 0; }
nav.main-nav a:hover, nav.main-nav a.current { color: var(--gold); }
.header-cta {
  background: var(--gold); color: var(--navy-deep);
  padding: 10px 22px; font-size: 13px; font-weight: 700; letter-spacing: 0.08em;
  border: none; cursor: pointer; transition: background 0.2s;
}
.header-cta:hover { background: #e6c046; }
.menu-btn { display: none; background: none; border: none; color: var(--kinari); font-size: 24px; cursor: pointer; }
@media (max-width: 900px) {
  nav.main-nav { display: none; }
  nav.main-nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--navy-deep); padding: 24px 32px; gap: 18px;
    border-top: 1px solid var(--line-light);
  }
  .menu-btn { display: block; }
}

/* ─── 記事ヘッダー（タイトル帯） ─── */
.article-hero {
  background: var(--navy-deep);
  color: var(--kinari);
  padding: 140px 0 56px;
  position: relative;
  border-bottom: 1px solid var(--line-light);
}
.breadcrumb {
  font-size: 12px; letter-spacing: 0.06em;
  color: rgba(245, 243, 238, 0.55);
  margin-bottom: 22px;
}
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb span { margin: 0 8px; color: rgba(245, 243, 238, 0.3); }
.article-eyebrow {
  font-family: "Cormorant Garamond", serif; font-style: italic;
  color: var(--gold); font-size: 14px; letter-spacing: 0.18em;
  text-transform: uppercase; margin-bottom: 16px;
  display: inline-flex; align-items: center; gap: 12px;
}
.article-eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--gold); }
.article-hero h1 {
  font-family: "Noto Serif JP", serif; font-weight: 700;
  font-size: clamp(26px, 4.2vw, 40px); line-height: 1.5; letter-spacing: 0.03em;
}
.article-hero h1 .gold { color: var(--gold); }
.article-meta {
  margin-top: 24px; font-size: 12px; letter-spacing: 0.06em;
  color: rgba(245, 243, 238, 0.5); display: flex; gap: 20px; flex-wrap: wrap;
}

/* ─── 記事本文 ─── */
.article-body { padding: 64px 0 40px; }
.article-body .lead {
  font-size: 17px; line-height: 2; color: var(--ink);
  font-weight: 500; margin-bottom: 40px;
  padding-left: 18px; border-left: 3px solid var(--gold);
}
.article-body h2 {
  font-family: "Noto Serif JP", serif; font-weight: 600;
  font-size: clamp(21px, 3vw, 27px); line-height: 1.5; color: var(--navy);
  letter-spacing: 0.03em; margin: 56px 0 22px; padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.article-body h3 {
  font-family: "Noto Serif JP", serif; font-weight: 600;
  font-size: clamp(17px, 2.4vw, 20px); color: var(--navy-mid);
  letter-spacing: 0.02em; margin: 36px 0 14px;
  display: flex; align-items: baseline; gap: 10px;
}
.article-body h3 .num { color: var(--gold); font-family: "Cormorant Garamond", serif; font-style: italic; font-size: 1.2em; }
.article-body p { font-size: 15.5px; line-height: 2.05; margin-bottom: 22px; }
.article-body strong { color: var(--navy); font-weight: 700; }
.article-body ul, .article-body ol { margin: 0 0 26px; padding-left: 1.4em; }
.article-body li { font-size: 15.5px; line-height: 1.95; margin-bottom: 10px; }
.article-body a.inline { color: var(--gold-deep); text-decoration: underline; text-underline-offset: 3px; }
.article-body a.inline:hover { color: var(--gold-soft); }

/* 強調ボックス */
.callout {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  padding: 24px 26px; margin: 32px 0; border-radius: 2px;
}
.callout .callout-title {
  font-family: "Noto Serif JP", serif; font-weight: 600; color: var(--navy);
  font-size: 16px; margin-bottom: 10px;
}
.callout p { margin-bottom: 0; font-size: 14.5px; }

/* 目次 */
.toc {
  background: #fff; border: 1px solid var(--line);
  padding: 24px 28px; margin: 0 0 44px; border-radius: 2px;
}
.toc-title {
  font-family: "Noto Serif JP", serif; font-weight: 600; color: var(--navy);
  font-size: 15px; margin-bottom: 14px; letter-spacing: 0.04em;
}
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: toc; }
.toc li { font-size: 14px; line-height: 1.7; margin-bottom: 8px; counter-increment: toc; padding-left: 28px; position: relative; }
.toc li::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute; left: 0; color: var(--gold);
  font-family: "Cormorant Garamond", serif; font-style: italic; font-size: 13px;
}
.toc a:hover { color: var(--gold-deep); }

/* ─── 記事末CTA ─── */
.article-cta {
  background: var(--navy); color: var(--kinari);
  padding: 56px 0; margin-top: 56px;
}
.article-cta .inner { max-width: 820px; margin: 0 auto; padding: 0 24px; text-align: center; }
.article-cta .eyebrow {
  font-family: "Cormorant Garamond", serif; font-style: italic;
  color: var(--gold); font-size: 13px; letter-spacing: 0.18em;
  text-transform: uppercase; margin-bottom: 14px;
}
.article-cta h2 {
  font-family: "Noto Serif JP", serif; font-weight: 600;
  font-size: clamp(20px, 3vw, 28px); line-height: 1.5; margin-bottom: 16px;
}
.article-cta p { font-size: 14.5px; line-height: 1.9; color: rgba(245, 243, 238, 0.7); margin-bottom: 30px; }
.cta-btn {
  display: inline-block; background: var(--gold); color: var(--navy-deep);
  padding: 16px 40px; font-size: 15px; font-weight: 700; letter-spacing: 0.06em;
  transition: background 0.2s;
}
.cta-btn:hover { background: #e6c046; }
.cta-note { margin-top: 18px; font-size: 12px; color: rgba(245, 243, 238, 0.45); }

/* ─── 関連記事 ─── */
.related { padding: 56px 0; background: var(--kinari-warm); }
.related .container-narrow { max-width: 820px; }
.related-title {
  font-family: "Noto Serif JP", serif; font-weight: 600; color: var(--navy);
  font-size: 20px; margin-bottom: 24px;
}
.related-list { display: grid; gap: 14px; }
.related-list a {
  display: block; background: #fff; border: 1px solid var(--line);
  padding: 18px 22px; font-size: 15px; color: var(--navy);
  font-family: "Noto Serif JP", serif; transition: border-color 0.2s, transform 0.2s;
}
.related-list a:hover { border-color: var(--gold); transform: translateX(4px); }
.related-list a .arrow { color: var(--gold); float: right; }

/* ─── コラム一覧ページ ─── */
.column-index-hero {
  background: var(--navy-deep); color: var(--kinari);
  padding: 140px 0 56px; text-align: center; border-bottom: 1px solid var(--line-light);
}
.column-index-hero .article-eyebrow { justify-content: center; }
.column-index-hero h1 { font-family: "Noto Serif JP", serif; font-weight: 700; font-size: clamp(28px, 4.5vw, 42px); letter-spacing: 0.04em; }
.column-index-hero p { margin-top: 18px; font-size: 14.5px; color: rgba(245, 243, 238, 0.6); line-height: 1.9; }
.column-list { padding: 64px 0 40px; }
.column-card {
  display: block; background: #fff; border: 1px solid var(--line);
  padding: 32px 34px; margin-bottom: 22px; transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.column-card:hover { border-color: var(--gold); transform: translateY(-3px); box-shadow: 0 12px 30px rgba(10,25,55,0.08); }
.column-card .cat { font-family: "Cormorant Garamond", serif; font-style: italic; color: var(--gold); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; }
.column-card h2 { font-family: "Noto Serif JP", serif; font-weight: 600; color: var(--navy); font-size: clamp(18px, 2.6vw, 23px); line-height: 1.5; margin: 10px 0 12px; }
.column-card p { font-size: 14px; line-height: 1.9; color: var(--ink-soft); }
.column-card .read { margin-top: 16px; font-size: 13px; color: var(--gold-deep); font-weight: 700; letter-spacing: 0.05em; }

/* ─── Footer ─── */
footer { background: var(--navy); color: rgba(245, 243, 238, 0.78); padding: 72px 0 32px; }
footer .container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 56px;
  padding-bottom: 56px; border-bottom: 1px solid var(--line-light);
}
.footer-brand .logo { color: var(--kinari); margin-bottom: 24px; }
.footer-brand p { font-size: 12px; line-height: 2; color: rgba(245, 243, 238, 0.5); }
.footer-col h5 {
  font-family: "Cormorant Garamond", serif; font-style: italic; color: var(--gold);
  font-size: 14px; letter-spacing: 0.18em; margin-bottom: 24px; text-transform: uppercase;
}
.footer-col ul { list-style: none; }
.footer-col li { font-size: 13px; padding: 6px 0; line-height: 1.8; }
.footer-col a:hover { color: var(--gold); }
.footer-info { font-size: 12px; line-height: 1.9; }
.footer-info dt { color: rgba(245, 243, 238, 0.4); margin-top: 10px; }
.footer-info dd { color: rgba(245, 243, 238, 0.85); }
.footer-bottom {
  padding-top: 32px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  font-size: 11px; color: rgba(245, 243, 238, 0.4); letter-spacing: 0.05em;
}
.footer-bottom a { margin-left: 24px; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 500px) { .footer-grid { grid-template-columns: 1fr; } }