/* オーナーキャピタル研究所 / Design Tokens
   ムード: D 金融プレミアム型（Diamond Online / PRESIDENT Online 準拠・2026-05-30 ハイグレード刷新）
   原則: 純白＋濃紺＋青リンク＋抑えた金（細罫のみ）＋赤PICK UP。直角寄り・影/グラデ排除・blur固定ヘッダー廃止・
        記者名重視・新聞的ヒエラルキー・余白の規律。クラス名/トークン名は従来維持（値のみ刷新）。 */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f9;        /* 冷たい薄灰（区切り・引用） */
  --color-ink: #15202e;
  --color-ink-sub: #5b6678;
  --color-charcoal: #14294a;      /* 濃紺＝プライマリ（旧charcoal） */
  --color-gold: #9a7b33;          /* 抑えた金：細罫・eyebrowのみ（塗りに使わない） */
  --color-gold-soft: #e8e2d2;
  --color-line: #e1e4ea;          /* ヘアライン罫 */
  --color-link: #1a5dab;          /* 本文/アンカーの青（Diamond） */
  --color-pickup: #9c2a2a;        /* 赤：PICK UP / 重要ラベル（PRESIDENT/Diamond） */
  --color-warn-bg: #f8f5ee;
  --color-warn-border: #9a7b33;

  --font-serif: "Noto Serif JP", "Yu Mincho", "YuMincho", serif;
  --font-sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;

  --max-width: 1180px;
  --sidebar-width: 312px;
  --content-width: 720px;
}

* { box-sizing: border-box; }
html { font-size: 17px; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color .15s;
}
a:hover { color: var(--color-charcoal); text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--color-charcoal);
}
h1 { font-size: 2.05rem; line-height: 1.4; margin: 0 0 1.2rem; }
/* 見出しは■を廃し、濃紺の太罫＋細い金のアクセントtickで（Diamond/PRESIDENT的） */
h2 { font-size: 1.5rem; line-height: 1.5; margin: 2.6rem 0 1.1rem; padding-bottom: .5rem; border-bottom: 2px solid var(--color-charcoal); position: relative; }
h2::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 56px; height: 2px; background: var(--color-gold); }
h3 { font-size: 1.18rem; line-height: 1.55; margin: 1.9rem 0 .8rem; padding-left: .75rem; border-left: 3px solid var(--color-charcoal); }

p { margin: 0 0 1em; }
strong { color: var(--color-charcoal); font-weight: 700; background: none; padding: 0; }

ul, ol { padding-left: 1.4em; margin: 0 0 1.2em; }
ul li, ol li { margin: .35em 0; }

blockquote {
  border-left: 3px solid var(--color-charcoal);
  background: var(--color-bg-alt);
  margin: 1.5em 0; padding: 1em 1.4em;
  color: var(--color-ink-sub); font-size: .95em;
}
blockquote cite { display: block; margin-top: .6em; font-size: .85em; font-style: normal; color: var(--color-ink-sub); }

.table-wrap { overflow-x: auto; margin: 1.5em 0; -webkit-overflow-scrolling: touch; }
table { width: 100%; min-width: 520px; border-collapse: collapse; font-size: .95em; background: #fff; }
th, td { border: 1px solid var(--color-line); padding: .7em .9em; text-align: left; vertical-align: top; }
thead th { background: var(--color-charcoal); color: #fff; font-weight: 500; white-space: nowrap; }
tbody tr:nth-child(even) { background: var(--color-bg-alt); }
img { max-width: 100%; height: auto; display: block; }

/* === Header（白地・ヘアライン・blur/sticky陰影なし） === */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: #fff;
  border-bottom: 1px solid var(--color-charcoal);
}
.site-header .inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: .95rem 1.2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.site-logo {
  font-family: var(--font-serif); font-size: 1.25rem; font-weight: 600;
  color: var(--color-charcoal); text-decoration: none; letter-spacing: .03em;
  display: flex; align-items: center; gap: .55rem;
}
.site-logo:hover { text-decoration: none; }
.site-logo .mark {
  width: 30px; height: 30px;
  background: var(--color-charcoal); color: #fff;
  font-size: .9rem; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 2px; font-family: var(--font-serif); font-weight: 700;
}
.site-logo .label-sub { font-size: .68rem; font-family: var(--font-sans); color: var(--color-ink-sub); letter-spacing: .18em; margin-left: .4rem; display: inline-block; }
.global-nav { display: flex; gap: 1.5rem; font-size: .9rem; }
.global-nav a { text-decoration: none; color: var(--color-charcoal); position: relative; padding-bottom: 3px; }
.global-nav a:hover { text-decoration: none; }
.global-nav a:hover::after { content: ""; position: absolute; left: 0; bottom: 0; right: 0; height: 2px; background: var(--color-charcoal); }

/* === Hero（ダーク全面オーバーレイ廃止→白地2カラムの編集マストヘッド） === */
.hero {
  max-width: var(--max-width); margin: 0 auto; padding: 3rem 1.2rem 2.4rem;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 2.6rem; align-items: center;
  border-bottom: 1px solid var(--color-line);
}
.hero img {
  order: 2; width: 100%; height: 100%; max-height: 340px; object-fit: cover;
  border: 1px solid var(--color-line); filter: saturate(.96);
}
.hero .hero-content { order: 1; position: static; text-align: left; max-width: none; padding: 0; }
.hero h1 { color: var(--color-charcoal); font-size: 2.3rem; line-height: 1.45; letter-spacing: .02em; margin: 0 0 1rem; }
.hero h1 small { display: block; font-size: .72rem; color: var(--color-gold); letter-spacing: .3em; margin-bottom: 1rem; font-family: var(--font-sans); font-weight: 700; }
.hero h1 small::before { content: "— "; }
.hero p { color: var(--color-ink-sub); font-size: .98rem; margin: 0; line-height: 1.9; }

/* === Layout === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 2.6rem 1.2rem 4rem; }
.layout { display: grid; grid-template-columns: 1fr var(--sidebar-width); gap: 2.8rem; align-items: start; }

/* セクション見出し（一覧の「最新の研究ノート」等）はh2を継承 */

/* === Article Card（ヘアライン・直角寄り・影なし） === */
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.6rem; }
.article-card {
  background: #fff; border: 1px solid var(--color-line); border-radius: 2px;
  overflow: hidden; transition: border-color .15s; display: flex; flex-direction: column;
}
.article-card:hover { transform: none; box-shadow: none; border-color: var(--color-charcoal); }
.article-card a { text-decoration: none; color: inherit; display: flex; flex-direction: column; height: 100%; }
.article-card a:hover { text-decoration: none; }
.article-card .thumb { aspect-ratio: 16/9; overflow: hidden; background: var(--color-bg-alt); border-bottom: 1px solid var(--color-line); }
.article-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.article-card .body { padding: 1.1rem 1.25rem 1.35rem; flex: 1; display: flex; flex-direction: column; }
.article-card .meta { font-size: .76rem; color: var(--color-ink-sub); margin-bottom: .55rem; display: flex; gap: .8rem; align-items: center; }
.article-card .meta .cat { color: var(--color-charcoal); font-weight: 700; letter-spacing: .04em; }
.article-card .meta .cat::before { content: ""; display: inline-block; width: 8px; height: 8px; background: var(--color-gold); margin-right: .4em; vertical-align: middle; }
.article-card .title { font-family: var(--font-serif); font-size: 1.08rem; line-height: 1.55; color: var(--color-charcoal); margin: 0 0 .6rem; flex: 1; }
.article-card:hover .title { color: var(--color-link); }
.article-card .excerpt { font-size: .85rem; color: var(--color-ink-sub); margin: 0; line-height: 1.8; }

/* === Sidebar === */
.sidebar { position: sticky; top: 88px; align-self: start; }
.sidebar-block { background: #fff; border: 1px solid var(--color-line); padding: 1.3rem 1.35rem; margin-bottom: 1.3rem; }
.sidebar-block h4 {
  font-family: var(--font-serif); font-size: 1rem; margin: 0 0 .9rem; padding-bottom: .55rem;
  border-bottom: 2px solid var(--color-charcoal); color: var(--color-charcoal);
}
.cat-list { list-style: none; padding: 0; margin: 0; }
.cat-list li { margin: 0; }
.cat-list a { display: flex; justify-content: space-between; align-items: center; padding: .6rem 0; border-bottom: 1px solid var(--color-line); font-size: .88rem; text-decoration: none; color: var(--color-charcoal); }
.cat-list a:hover { color: var(--color-link); text-decoration: none; }
.cat-list .count { color: var(--color-ink-sub); font-size: .8rem; }
.cat-list li:last-child a { border-bottom: none; }

/* 最新ノートのサイドバーをランキング風に（任意の高級感／Diamond的）。
   2つ目以降の .sidebar-block 内 .cat-list には連番を付与 */
.sidebar-block.ranked .cat-list { counter-reset: rk; }
.sidebar-block.ranked .cat-list a { position: relative; padding-left: 2rem; }
.sidebar-block.ranked .cat-list a::before { counter-increment: rk; content: counter(rk); position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 1.3rem; height: 1.3rem; background: var(--color-charcoal); color: #fff; font-size: .72rem; display: flex; align-items: center; justify-content: center; font-family: var(--font-serif); }

.profile-card { display: flex; flex-direction: column; align-items: center; text-align: center; }
.profile-card .avatar { width: 76px; height: 76px; background: var(--color-charcoal); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: var(--font-serif); font-size: 1.7rem; margin: 0 auto .85rem; }
.profile-card .name { font-family: var(--font-serif); font-size: 1.05rem; color: var(--color-charcoal); margin: 0 0 .2rem; }
.profile-card .role { font-size: .76rem; color: var(--color-ink-sub); letter-spacing: .04em; margin: 0 0 .85rem; }
.profile-card .desc { font-size: .82rem; color: var(--color-ink-sub); line-height: 1.75; text-align: left; }

/* === Article Page === */
.article-page header.article-head { margin-bottom: 2rem; }
.breadcrumb { font-size: .8rem; color: var(--color-ink-sub); margin-bottom: 1.2rem; letter-spacing: .02em; }
.breadcrumb a { color: var(--color-ink-sub); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-link); }
.breadcrumb .sep { margin: 0 .5em; color: var(--color-line); }

.article-meta { display: flex; gap: 1rem; align-items: center; font-size: .8rem; color: var(--color-ink-sub); margin-bottom: 1.5rem; flex-wrap: wrap; padding-bottom: 1.1rem; border-bottom: 1px solid var(--color-line); }
.article-meta .cat-tag { background: var(--color-charcoal); color: #fff; padding: .28rem .85rem; font-size: .76rem; letter-spacing: .1em; border-radius: 2px; }
.article-meta .read-time::before { content: "・"; }

.article-page h1 { font-size: 1.95rem; line-height: 1.55; margin-bottom: 1rem; }

.article-hero { margin: 0 0 2.5rem; aspect-ratio: 16/9; overflow: hidden; background: var(--color-bg-alt); border: 1px solid var(--color-line); }
.article-hero img { width: 100%; height: 100%; object-fit: cover; }

.toc { background: var(--color-bg-alt); border-left: 3px solid var(--color-charcoal); padding: 1.1rem 1.4rem 1.1rem 1.6rem; margin: 0 0 2.5rem; }
.toc summary { font-family: var(--font-serif); font-weight: 600; cursor: pointer; color: var(--color-charcoal); font-size: 1.05rem; list-style: none; display: flex; align-items: center; gap: .5rem; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary::before { content: "目次"; display: inline-block; background: var(--color-charcoal); color: #fff; font-size: .7rem; padding: .15em .8em; letter-spacing: .15em; margin-right: .8em; font-family: var(--font-sans); }
.toc[open] summary::after { content: " ▲"; margin-left: auto; color: var(--color-ink-sub); font-size: .8em; }
.toc:not([open]) summary::after { content: " ▼"; margin-left: auto; color: var(--color-ink-sub); font-size: .8em; }
.toc ol { list-style: none; padding: 0; margin: 1rem 0 0; counter-reset: toc-h2; }
.toc ol > li { counter-increment: toc-h2; padding: .35em 0; font-size: .92rem; }
.toc ol > li::before { content: counter(toc-h2, decimal-leading-zero) ". "; color: var(--color-gold); font-weight: 700; margin-right: .3em; }
.toc ol > li > ol { margin: .35em 0 .35em 1.2em; counter-reset: toc-h3; }
.toc ol > li > ol > li { counter-increment: toc-h3; font-size: .85rem; padding: .2em 0; }
.toc ol > li > ol > li::before { content: counter(toc-h2) "-" counter(toc-h3) ". "; color: var(--color-ink-sub); }
.toc a { text-decoration: none; color: var(--color-charcoal); }
.toc a:hover { color: var(--color-link); }

.article-body { font-size: 1rem; line-height: 1.95; }
.article-body p { margin: 0 0 1.3em; }
.article-body a { color: var(--color-link); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.article-body h2 { scroll-margin-top: 80px; }
.article-body h3 { scroll-margin-top: 80px; }

.callout { background: var(--color-warn-bg); border-left: 3px solid var(--color-warn-border); padding: 1.2rem 1.4rem; margin: 2em 0; font-size: .95rem; }
.callout .label { display: inline-block; background: var(--color-charcoal); color: #fff; font-size: .72rem; letter-spacing: .15em; padding: .2em .8em; margin-bottom: .6em; }
.callout p { margin: .3em 0; }
.callout strong { background: none; padding: 0; }

.cta-box { background: var(--color-charcoal); color: #fff; padding: 1.9rem 2rem; margin: 2.5em 0; border-radius: 2px; position: relative; }
.cta-box::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--color-gold); }
.cta-box h4 { color: #fff; font-size: 1.12rem; margin: 0 0 .8rem; }
.cta-box p { color: #cfd6e2; font-size: .92rem; margin: 0 0 1rem; }
.cta-box .btn { display: inline-block; background: #fff; color: var(--color-charcoal); padding: .8rem 2rem; text-decoration: none; font-weight: 700; letter-spacing: .08em; font-size: .9rem; border-radius: 2px; transition: background .15s, color .15s; }
.cta-box .btn:hover { background: var(--color-gold); color: #fff; text-decoration: none; }
.cta-box small { display: block; color: #9aa6b8; font-size: .72rem; margin-top: .8rem; }

.share-bar { display: flex; gap: .8rem; margin: 3em 0 2em; padding: 1.2rem; background: var(--color-bg-alt); border-top: 2px solid var(--color-charcoal); align-items: center; }
.share-bar .label { font-size: .82rem; color: var(--color-ink-sub); margin-right: auto; font-family: var(--font-serif); }
.share-bar a { display: inline-flex; align-items: center; gap: .35rem; padding: .5rem 1rem; background: #fff; border: 1px solid var(--color-line); text-decoration: none; font-size: .82rem; color: var(--color-charcoal); border-radius: 2px; }
.share-bar a:hover { border-color: var(--color-charcoal); text-decoration: none; }

.related { margin: 3em 0 2em; }
.related h3 { font-size: 1.2rem; border-left: none; padding-left: 0; border-bottom: 2px solid var(--color-charcoal); padding-bottom: .5rem; margin-bottom: 1.4rem; }
.related h3::before { content: "RELATED READING"; font-family: var(--font-sans); font-size: .62em; letter-spacing: .2em; color: var(--color-gold); display: block; font-weight: 700; }

/* === Footer === */
.site-footer { background: var(--color-charcoal); color: #c4ccda; padding: 3rem 0 1.5rem; margin-top: 4rem; font-size: .85rem; }
.site-footer .inner { max-width: var(--max-width); margin: 0 auto; padding: 0 1.2rem; }
.site-footer .grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; margin-bottom: 2.5rem; }
.site-footer h5 { font-family: var(--font-serif); color: #fff; font-size: 1rem; margin: 0 0 .8rem; }
.site-footer .desc { color: #93a0b5; font-size: .82rem; line-height: 1.7; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .4em 0; }
.site-footer a { color: #c4ccda; text-decoration: none; font-size: .85rem; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer .tag-row { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .8rem; }
.site-footer .tag-row span { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); padding: .2em .8em; font-size: .75rem; color: #93a0b5; border-radius: 2px; }
.site-footer .copyright { border-top: 1px solid rgba(255,255,255,.1); padding-top: 1.2rem; text-align: center; font-size: .78rem; color: #74809a; }
.site-footer .disclaimer { background: rgba(0,0,0,.18); padding: 1rem 1.2rem; margin-bottom: 1.5rem; font-size: .78rem; line-height: 1.7; color: #93a0b5; border-left: 2px solid var(--color-gold); }

/* === Page Lead (about/privacy/contact) === */
.page-lead { text-align: center; padding: 2.6rem 0 2rem; border-bottom: 1px solid var(--color-line); margin-bottom: 2.6rem; }
.page-lead .eyebrow { font-size: .72rem; color: var(--color-gold); letter-spacing: .3em; margin-bottom: .5rem; font-weight: 700; }
.page-lead h1 { margin: 0; }
.page-lead p { color: var(--color-ink-sub); margin-top: .6rem; font-size: .95rem; }

.prose { max-width: 720px; margin: 0 auto; }
.prose h2:first-child { margin-top: 0; }
.prose dl { margin: 1.5rem 0; }
.prose dt { font-family: var(--font-serif); font-weight: 600; color: var(--color-charcoal); margin-top: 1.2rem; }
.prose dd { margin: .3rem 0 0 1.5rem; color: var(--color-ink); }

/* === Form === */
.form-block { background: #fff; border: 1px solid var(--color-line); padding: 2rem; max-width: 640px; margin: 0 auto; }
.form-row { margin-bottom: 1.4rem; }
.form-row label { display: block; font-size: .88rem; font-weight: 600; color: var(--color-charcoal); margin-bottom: .4rem; }
.form-row label .req { color: var(--color-pickup); margin-left: .3rem; font-size: .8rem; }
.form-row input, .form-row textarea, .form-row select { width: 100%; padding: .7rem .9rem; border: 1px solid var(--color-line); background: var(--color-bg); font-size: .95rem; font-family: inherit; border-radius: 2px; }
.form-row input:focus, .form-row textarea:focus { outline: none; border-color: var(--color-charcoal); }
.form-row textarea { min-height: 140px; resize: vertical; }
.form-submit { background: var(--color-charcoal); color: #fff; border: none; padding: .9rem 2.5rem; font-size: .95rem; letter-spacing: .12em; cursor: pointer; font-family: var(--font-serif); border-radius: 2px; }
.form-submit:hover { background: var(--color-gold); }

/* === Mobile === */
@media (max-width: 880px) {
  html { font-size: 16px; }
  h1 { font-size: 1.6rem; }
  .hero { grid-template-columns: 1fr; gap: 1.4rem; padding: 2rem 1rem 1.8rem; }
  .hero img { order: -1; max-height: 220px; }
  .hero h1 { font-size: 1.7rem; }
  .layout { grid-template-columns: 1fr; gap: 2rem; }
  .sidebar { position: static; }
  .article-page h1 { font-size: 1.45rem; }
  .article-hero { margin: 0 0 1.8rem; }
  .site-footer .grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .article-body { font-size: .95rem; line-height: 1.9; }
  .container { padding: 1.6rem 1rem 3rem; }
}
@media (max-width: 720px) {
  .site-header .inner { padding: .7rem 1rem; gap: .5rem; }
  .site-logo { font-size: 1rem; gap: .4rem; }
  .site-logo .mark { width: 26px; height: 26px; font-size: .78rem; }
  .site-logo .label-sub { display: none; }
  .global-nav { gap: .9rem; font-size: .78rem; flex-wrap: nowrap; }
  .global-nav a { white-space: nowrap; }
}
@media (max-width: 480px) {
  .site-logo > span:not(.mark) { font-size: .85rem; line-height: 1.2; }
  .global-nav { gap: .6rem; font-size: .72rem; }
}