:root {
  --bg: #faf8f3; --fg: #23211e; --mute: #6f6a62; --line: #e2ddd2; --card: #fffdf8;
  --accent: #7a2e1f; --chip: #f0ebe0;
  --ok: #1f6b45; --memo: #6b5a1f; --unk: #8a3a2a; --sec: #4a4f8a;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  --sans: "Hiragino Sans", "Yu Gothic UI", "Meiryo", "Noto Sans JP", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171614; --fg: #e9e5dc; --mute: #a39d92; --line: #34312c; --card: #1f1d1a;
    --accent: #e08b6f; --chip: #2a2723;
    --ok: #6fc59a; --memo: #d4bf6a; --unk: #f0907a; --sec: #9ea6f0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--sans); line-height: 1.8; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.small { font-size: .85rem; color: var(--mute); }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.45; }

/* ヘッダー */
.site-head { border-bottom: 1px solid var(--line); background: var(--bg); }
.head-row { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding-top: 14px; flex-wrap: wrap; }
.logo { font-family: var(--serif); font-size: 1.6rem; color: var(--fg); text-decoration: none; letter-spacing: .04em; }
.logo-sub { display: block; font-size: .8rem; color: var(--mute); letter-spacing: 0; }
.head-nav a { margin-left: 14px; font-size: .9rem; }
.shelf-nav { display: flex; gap: 6px 16px; flex-wrap: wrap; padding-top: 8px; padding-bottom: 10px; font-size: .9rem; }
.shelf-nav a { color: var(--fg); text-decoration: none; }
.shelf-nav a:hover { color: var(--accent); }

main.wrap { padding-top: 20px; padding-bottom: 48px; }
.crumb { font-size: .85rem; color: var(--mute); }

/* トップ */
.hero { max-width: 760px; margin: 12px 0 32px; }
.hero-motto { font-family: var(--serif); font-style: italic; color: var(--accent); margin: 0; letter-spacing: .05em; }
.hero h1 { font-size: clamp(1.5rem, 4vw, 2.2rem); margin: .2em 0 .4em; }
.legend { font-size: .85rem; color: var(--mute); }

/* 印 */
.mark { display: inline-block; font-size: .72em; line-height: 1; padding: .22em .38em; border-radius: 3px; vertical-align: .18em;
  border: 1px solid currentColor; font-family: var(--sans); font-weight: 600; cursor: help; margin: 0 .1em; }
.m-ok { color: var(--ok); } .m-memo { color: var(--memo); } .m-unk { color: var(--unk); } .m-sec { color: var(--sec); }

/* チップ・カード */
.chip { display: inline-block; font-size: .8rem; padding: .15em .65em; margin: 0 .35em .35em 0; border-radius: 999px;
  background: var(--chip); color: var(--fg); text-decoration: none; border: 1px solid transparent; font-family: var(--sans); cursor: pointer; }
button.chip { font: inherit; font-size: .8rem; }
.chip.shelf { font-weight: 600; }
.chip.on { background: var(--accent); color: var(--bg); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; }
.card[hidden] { display: none; }
.card h3 { font-size: 1.12rem; margin: .2em 0 .3em; }
.card h3 a { color: var(--fg); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card-meta { font-size: .8rem; color: var(--mute); margin: 0; }
.card-meta time { margin-left: .2em; }
.card-sum { font-size: .9rem; margin: .3em 0 .5em; }
.card-tags { margin: 0; }
.filter, .recs { margin: 0 0 28px; }
.filter h2, .recs h2, section > h2 { font-size: 1.15rem; border-bottom: 1px solid var(--line); padding-bottom: .2em; }
.linkbtn { background: none; border: 0; color: var(--accent); text-decoration: underline; cursor: pointer; font: inherit; padding: 0; }

/* 記事 */
.post { max-width: 720px; position: relative; }
.post-head h1 { font-size: clamp(1.5rem, 4.2vw, 2.1rem); margin: .3em 0 .4em; }
.lead { font-family: var(--serif); font-size: 1.05rem; color: var(--mute); }
.en { font-size: .9rem; border-left: 3px solid var(--line); padding-left: 12px; margin: 8px 0; }
.en summary { cursor: pointer; color: var(--mute); }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 8px 16px; font-size: .9rem; }
.toc p { margin: 0; font-weight: 600; }
.toc ol { margin: .3em 0; padding-left: 1.4em; }
.post-body { font-family: var(--serif); font-size: 1.06rem; line-height: 2; }
.post-body h2 { font-size: 1.35rem; margin-top: 2em; border-bottom: 1px solid var(--line); }
.post-body p { margin: 0 0 1.1em; }
.post-body img { max-width: 100%; height: auto; display: block; margin: 0 auto; }
.post-body table { border-collapse: collapse; width: 100%; font-family: var(--sans); font-size: .88rem; line-height: 1.6; display: block; overflow-x: auto; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: .4em .6em; text-align: left; vertical-align: top; }
.post-body th { background: var(--chip); }
.post-body blockquote { margin: 1em 0; padding: .2em 1em; border-left: 3px solid var(--accent); color: var(--mute); }
sup.footnote-ref a, sup a.footnote-ref { text-decoration: none; font-family: var(--sans); font-weight: 600; padding: 0 .1em; }
.footnote { font-family: var(--sans); font-size: .85rem; line-height: 1.7; border-top: 1px solid var(--line); margin-top: 2.5em; }
.footnote::before { content: "注と出典"; display: block; font-weight: 600; margin: .8em 0 .3em; }
.footnote hr { display: none; }

/* 横の余白の注（PC）・タップで開く注（スマホ） */
.sidenote { font-family: var(--sans); font-size: .8rem; line-height: 1.6; color: var(--mute); }
.sidenote .sn-num { font-weight: 600; color: var(--accent); margin-right: .3em; }
.sidenote .footnote-backref { display: none; }
@media (min-width: 1100px) {
  .post-body { position: relative; }
  .sidenote { position: absolute; left: calc(100% + 32px); width: 300px; border-left: 2px solid var(--line); padding-left: 10px; }
}
@media (max-width: 1099px) {
  .sidenote { display: none; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 8px 12px; margin: .2em 0 1em; }
  .sidenote.open { display: block; }
}

.cite-box { font-family: var(--sans); font-size: .85rem; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 10px 14px; margin: 2em 0 1em; }
.cite-box input { width: 100%; font-size: .8rem; padding: 4px 6px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
.related { margin-top: 40px; }
.toc-shelf { margin-bottom: 24px; }
.toc-list { padding-left: 1.4em; }
.en-block { border-top: 1px solid var(--line); margin-top: 2em; font-family: var(--serif); }

.site-foot { border-top: 1px solid var(--line); padding: 20px 0 40px; font-size: .85rem; color: var(--mute); }
.site-foot .motto { font-family: var(--serif); font-style: italic; }

/* ── 2026-10-13 簡素化：カード→行の一覧 ── */
.hero { margin: 8px 0 28px; }
.hero h1 { font-size: clamp(1.4rem, 3.6vw, 1.9rem); }
.rows { max-width: 760px; }
.row { padding: 14px 0; border-bottom: 1px solid var(--line); }
.row[hidden] { display: none; }
.row h3 { font-size: 1.15rem; margin: .1em 0 .2em; }
.row h3 a { color: var(--fg); text-decoration: none; }
.row h3 a:hover { color: var(--accent); }
.row-meta { font-size: .8rem; color: var(--mute); margin: 0; }
.row-meta a { color: var(--mute); text-decoration: none; }
.row-sum { font-size: .9rem; color: var(--mute); margin: 0; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.filter { margin: 0 0 8px; max-width: 760px; }
.chip { background: none; border: 1px solid var(--line); color: var(--mute); }
.chip.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.tagbox { margin: 6px 0; font-size: .85rem; color: var(--mute); }
.tagbox summary { cursor: pointer; }
.tagbox .chips { margin-top: 8px; }
.list-h { font-size: 1.5rem; }
.post-tags { margin-top: 1.5em; }
.recs { max-width: 760px; }
.recs h2 { font-size: 1rem; }
.toc { margin-bottom: 1.6em; }

/* ── 2026-10-13 中間：画像と棚の色 ── */
.dot { display: inline-block; width: .55em; height: .55em; border-radius: 50%; background: var(--c); margin-right: .35em; vertical-align: .08em; }
.shelf-tag { display: inline-block; font-size: .72rem; color: #fff !important; background: var(--c); padding: .05em .55em; border-radius: 3px; margin-right: .4em; text-decoration: none; }
.row { display: grid; grid-template-columns: 200px 1fr; gap: 18px; align-items: start; }
.row-img img { width: 100%; height: auto; border-radius: 4px; display: block; }
.row-meta time { margin-left: .2em; }
.row-sum { -webkit-line-clamp: 2; }
.feature { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: center; margin: 0 0 18px; padding-bottom: 22px; border-bottom: 1px solid var(--line); max-width: 1000px; }
.feature img { width: 100%; height: auto; border-radius: 6px; display: block; }
.feature h2 { font-size: clamp(1.25rem, 2.6vw, 1.6rem); margin: .3em 0; border: 0; }
.feature h2 a { color: var(--fg); text-decoration: none; }
.feature p { color: var(--mute); font-size: .95rem; }
.post-eye { width: 100%; height: auto; border-radius: 6px; margin: .4em 0 .8em; display: block; }
.rows, .filter, .recs { max-width: 1000px; }
@media (max-width: 640px) {
  .row { grid-template-columns: 110px 1fr; gap: 12px; }
  .feature { grid-template-columns: 1fr; }
}
.feature[hidden] { display: none; }
.feature > *, .row > * { min-width: 0; }
html, body { overflow-x: hidden; }

/* 移した記事：元の見た目を保つ */
.post-raw { max-width: none; }
.post-raw .cite-box, .post-raw .post-tags { max-width: 860px; margin-left: auto; margin-right: auto; }

/* トップの帯（フェルメール・2026-10-14） */
.hero-art { position: relative; max-width: none; margin: 12px 0 28px; border-radius: 6px; overflow: hidden;
  background: #1f130b url("/assets/hero_vermeer.jpg") right center / cover no-repeat; aspect-ratio: 1600 / 560; min-height: 220px;
  display: flex; flex-direction: column; justify-content: center; }
.hero-art .hero-text { padding: 0 4.5%; max-width: 58%; }
.hero-art .hero-motto { color: #d8b56a; }
.hero-art h1 { color: #f4ede1; margin: .2em 0 0; text-shadow: 0 1px 6px rgba(0,0,0,.5); }
.hero-credit { position: absolute; left: 4.5%; bottom: 10px; margin: 0; font-size: .68rem; color: rgba(244,237,225,.55); line-height: 1.4; max-width: 60%; }
@media (max-width: 640px) {
  .hero-art { background-image: url("/assets/hero_vermeer_sp.jpg"); aspect-ratio: 900 / 600; min-height: 0; justify-content: flex-start; }
  .hero-art .hero-text { padding: 7% 5% 0; max-width: 62%; }
  .hero-art h1 { font-size: 1.25rem; }
  .hero-credit { font-size: .6rem; max-width: 90%; right: 5%; left: 5%; }
}

/* ロゴの読みと由来（2026-10-15） */
.brand { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.brand .logo-sub { display: inline; font-size: .78rem; color: var(--mute); }
@media (max-width: 640px) { .brand { display: block; } .brand .logo-sub { display: block; margin-top: 2px; font-size: .72rem; } }