/* ============================================================
   page.css — 記事ページ (introducedir / method / blog) 2026-09
   site.css の後に読み込む。site.css からは :root トークンと
   .wrap / .prose / .eyebrow / .site-head / .site-foot / .face-light だけを使い、
   ID セレクタ依存 (#philosophy::before 等) はここで再宣言する。

   ─ 紙面の憲法との関係 ─
   ・暖色 (--warm) は記事ページでは使わない (0 点)
   ・ループする動きは無し。reveal は初回 1 回のみ、easing は --mv-ease
   ・ゴースト座標数字は使わない (ヒーローの網の座標系に属する語彙)
   ・水平罫は「本文開始 (下げ振り線)」「CTA 境界」の 2 箇所 + 表の罫のみ。本文 h2 に罫は引かない
   ============================================================ */

/* ---------- 夜面ページヘッダー ---------- */
.art-hero{
  position:relative;                     /* .site-head (absolute) の基準 */
  min-height:clamp(300px, 34vw, 440px);
  padding:132px 0 72px;
  background:linear-gradient(#080D16, #0C1226 55%, #0A0F19);
  color:var(--sub);
  overflow:hidden;
}
.art-hero .eyebrow{color:var(--cold)}
.art-h{
  margin-top:18px;
  font-size:clamp(1.875rem, 1.45rem + 1.7vw, 2.75rem);   /* 30→44px */
  font-weight:700; line-height:1.35; letter-spacing:.02em;
  font-feature-settings:'palt'; color:var(--ink);
  text-wrap:balance;
}
.art-lead{
  margin-top:24px; max-width:40rem;
  font-size:clamp(1.0625rem, 1rem + .3vw, 1.1875rem); line-height:1.95;
  color:var(--sub); text-wrap:pretty;
}
.art-meta{
  margin-top:32px; display:flex; flex-wrap:wrap; gap:8px 22px;
  font-family:'Inter','Helvetica Neue',Arial,sans-serif;
  font-size:.8125rem; letter-spacing:.08em; color:var(--dim);
  font-variant-numeric:tabular-nums;
}
.art-meta:empty{display:none}

/* ---------- 夜→明の境界: 下げ振り線 (site.css #philosophy::before と同じ座標式) ---------- */
.art-fold{position:relative}
.art-fold::before{
  content:''; position:absolute; top:0; width:1px;
  height:calc(96px - 14px);
  left:calc(max(24px, (100% - 72rem)/2 + 24px) + 3px);   /* eyebrow ドット中心 x */
  background:var(--p-line-strong);
}

/* ---------- 紙面 ---------- */
.art-body{padding:96px 0 120px; overflow-x:clip}
.art-grid{display:grid; grid-template-columns:minmax(0, 40rem) minmax(0, 1fr); gap:0 64px; align-items:start}
.art-side{position:sticky; top:40px}
@media (max-width:1023px){
  .art-grid{grid-template-columns:minmax(0, 1fr)}
  .art-side{position:static; order:-1; margin-bottom:40px}
}

/* 目次 (h2 が 3 つ以上のときだけ生成される) */
.toc{border-top:1px solid var(--p-line); padding-top:18px; max-width:18rem}
.toc-h{
  margin:0; font-family:'Inter','Helvetica Neue',Arial,sans-serif;
  font-size:.75rem; font-weight:500; letter-spacing:.2em; text-transform:uppercase; color:var(--p-cap);
}
.toc ol{margin:12px 0 0; padding:0; list-style:none}
.toc li{margin-top:8px; font-size:.8125rem; line-height:1.7}
.toc a{color:var(--p-2nd); text-decoration:none}
.toc a:hover, .toc a:focus-visible{color:var(--p-ink); text-decoration:underline; text-underline-offset:4px}

/* ---------- 本文タイポ ---------- */
.prose > :first-child{margin-top:0}
.prose h2{
  position:relative; margin-top:80px; padding-left:19px;
  font-size:clamp(1.375rem, 1.2rem + .7vw, 1.75rem);   /* 22→28px */
  font-weight:700; line-height:1.5; letter-spacing:.02em;
  font-feature-settings:'palt'; color:var(--p-ink);
}
.prose h2::before{   /* ノードドット (eyebrow と同族) */
  content:''; position:absolute; left:0; top:.66em;
  width:7px; height:7px; border:1.5px solid currentColor; border-radius:50%;
}
.prose h2 + *{margin-top:24px}
.prose h3{
  margin-top:48px; font-size:1.125rem; font-weight:700; line-height:1.7;
  letter-spacing:.02em; font-feature-settings:'palt'; color:var(--p-ink);
}
.prose h3 + *{margin-top:12px}
.prose h4{margin-top:32px; font-size:1rem; font-weight:700; color:var(--p-ink)}
.prose p{margin-top:18px; font-size:1rem; line-height:1.95; color:var(--p-body); text-wrap:pretty}
.prose strong{font-weight:700; color:var(--p-ink)}
.prose ul, .prose ol{margin:18px 0 0; padding:0; list-style:none}
.prose li{position:relative; padding-left:1.25em; margin-top:8px; font-size:.9375rem; line-height:1.9; color:var(--p-2nd)}
.prose ul > li::before{content:''; position:absolute; left:0; top:.98em; width:7px; height:1px; background:var(--p-ink)}
.prose ol{counter-reset:li}
.prose ol > li{counter-increment:li; padding-left:1.8em}
.prose ol > li::before{
  content:counter(li, decimal-leading-zero); position:absolute; left:0; top:0;
  font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.75rem; font-weight:500;
  letter-spacing:.06em; color:var(--p-cap); line-height:2.4;
}
.prose li > ul, .prose li > ol{margin-top:6px}
.prose blockquote{margin:28px 0 0; padding:2px 0 2px 20px; border-left:1px solid var(--p-line-strong); color:var(--p-2nd)}
.prose blockquote p{margin-top:8px; font-size:.9375rem}
.prose hr{border:0; border-top:1px solid var(--p-line); margin:56px 0 0}
.prose code{font-family:ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace; font-size:.875em; background:var(--paper-deep); padding:.1em .4em; border-radius:2px}
.prose pre{margin-top:18px; padding:16px 18px; background:var(--paper-deep); overflow-x:auto; font-size:.875rem; line-height:1.7}
.prose pre code{background:none; padding:0}

/* 図 */
.prose figure{margin:36px 0 0}
.prose figure img{display:block; width:100%; height:auto; border:1px solid var(--p-line)}
.prose figcaption{margin-top:10px; font-size:.8125rem; line-height:1.7; color:var(--p-cap)}

/* 表 (整形済み HTML をそのまま通す) */
.prose table{width:100%; margin-top:28px; border-collapse:collapse; font-size:.9375rem; line-height:1.8; table-layout:fixed}   /* 列幅は生成器が <colgroup> で内容量に応じて配分 (autoColgroup) */
.prose td, .prose th{overflow-wrap:anywhere}
.prose th, .prose td{padding:12px 16px 12px 0; border-top:1px solid var(--p-line); text-align:left; vertical-align:top}
.prose tr:last-child th, .prose tr:last-child td{border-bottom:1px solid var(--p-line)}
.prose th{
  font-family:'Inter','Zen Kaku Gothic New',sans-serif; font-size:.8125rem; font-weight:500;
  letter-spacing:.06em; color:var(--p-cap);
}
.prose td strong{font-weight:500; color:var(--p-ink)}
@media (max-width:767px){
  .prose table{display:block; overflow-x:auto; -webkit-overflow-scrolling:touch}
}

/* ---------- タイムライン (```timeline) : 左に時刻軸 1 本、水平罫 0 ---------- */
.tl{position:relative; margin:36px 0 0; padding:0; list-style:none}
.tl::before{content:''; position:absolute; left:4.25rem; top:10px; bottom:10px; width:1px; background:var(--p-line-strong)}
.tl-item{position:relative; display:grid; grid-template-columns:4.25rem 1fr; gap:0 28px; padding-bottom:30px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:''; position:absolute; left:calc(4.25rem - 3px); top:.55em;
  width:7px; height:7px; border-radius:50%; background:var(--paper); border:1.5px solid var(--p-ink);
}
.tl-time{
  font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.8125rem; font-weight:500;
  letter-spacing:.08em; color:var(--p-cap); font-variant-numeric:tabular-nums; line-height:2;
}
.tl-txt p{margin-top:0}
.tl-title{font-size:1rem; font-weight:700; line-height:1.8; color:var(--p-ink)}
.tl-txt p + p{margin-top:6px; font-size:.9375rem; color:var(--p-2nd)}
@media (max-width:479px){
  .tl::before{left:3.1rem}
  .tl-item{grid-template-columns:3.1rem 1fr; gap:0 18px}
  .tl-item::before{left:calc(3.1rem - 3px)}
}

/* ---------- テキストカード (```cards) : #knowledge の media カードと同族 ---------- */
.cards{margin-top:32px; display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:32px}
.card{display:block; border-top:1px solid var(--p-line); padding-top:18px; text-decoration:none; color:inherit}
.face-light .card{text-decoration:none}
.card p{margin-top:0}
.card-tag{
  font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.75rem; font-weight:500;
  letter-spacing:.2em; text-transform:uppercase; color:var(--p-cap);
}
.card-title{margin-top:10px !important; font-size:1.0625rem; font-weight:700; line-height:1.7; letter-spacing:.02em; font-feature-settings:'palt'; color:var(--p-ink)}
.card-cta{margin-top:12px !important; font-size:.875rem; font-weight:500; color:var(--p-ink); text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:4px; text-decoration-color:var(--p-line-strong)}
.card:hover .card-cta, .card:focus-visible .card-cta{text-decoration-color:currentColor}
.card:focus-visible{outline:2px solid var(--p-ink); outline-offset:4px}

/* ---------- 夜面 CTA ---------- */
.art-cta{
  position:relative; padding:104px 0 112px;
  background:linear-gradient(#080D16, #0C1226 55%, #0A0F19); color:var(--sub);
}
.art-cta::before{   /* 明→夜の境界: 月白ヘアライン (site.css #contact::before と同じ) */
  content:''; position:absolute; top:0; width:1px; height:calc(96px - 14px);
  left:calc(max(24px, (100% - 72rem)/2 + 24px) + 3px);
  background:rgba(215,225,239,.22);
}
.art-cta .eyebrow{color:var(--cold)}
.art-cta-h{
  margin-top:18px; font-size:clamp(1.5rem, 1.3rem + .8vw, 2rem);
  font-weight:700; line-height:1.5; letter-spacing:.02em; font-feature-settings:'palt'; color:var(--ink);
}
.art-cta-txt{margin-top:18px; max-width:40rem; font-size:1rem; line-height:1.95; color:var(--sub)}
.art-cta-act{margin-top:36px}
.btn-line{
  display:inline-block; padding:14px 30px;
  border:1px solid var(--sub-strong); color:var(--ink); text-decoration:none;
  font-size:.9375rem; font-weight:500; letter-spacing:.08em;
  transition:background-color 300ms var(--mv-ease), border-color 300ms var(--mv-ease);
}
.btn-line:hover, .btn-line:focus-visible{background:rgba(215,225,239,.08); border-color:var(--ink)}
.btn-line:focus-visible{outline:2px solid var(--cold); outline-offset:4px}

/* ---------- reveal (site.js の [data-mv] を利用。初回 1 回・12px・--mv-ease) ---------- */
@media (prefers-reduced-motion: no-preference){
  .js .art-hero [data-mv], .js .art-cta [data-mv]{
    opacity:0; transform:translateY(12px);
    transition:opacity 500ms var(--mv-ease), transform 560ms var(--mv-ease);
  }
  .js .art-hero .art-h[data-mv], .js .art-cta .art-cta-h[data-mv]{transition-delay:120ms}
  .js .art-hero .art-lead[data-mv], .js .art-cta .art-cta-txt[data-mv]{transition-delay:240ms}
  .js .art-hero .art-meta[data-mv], .js .art-cta .art-cta-act[data-mv]{transition-delay:340ms}
  .js .art-hero [data-mv].in, .js .art-cta [data-mv].in{opacity:1; transform:none}
}
@media (prefers-reduced-motion: reduce){
  .art [data-mv]{opacity:1 !important; transform:none !important; transition:none !important}
}

/* ---------- 前後記事ナビ (記事末尾。罫は上 1 本のみ) ---------- */
.art-nav{
  margin-top:96px; padding-top:28px; border-top:1px solid var(--p-line);
  display:grid; grid-template-columns:1fr 1fr; gap:24px 40px; max-width:40rem;
}
.art-nav-link{display:block; text-decoration:none; color:inherit; min-width:0}
.face-light .art-nav-link{text-decoration:none}
.art-nav-next{text-align:right}
.art-nav-label{
  display:block; font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.75rem; font-weight:500;
  letter-spacing:.18em; text-transform:uppercase; color:var(--p-cap);
}
.art-nav-title{display:block; margin-top:8px; font-size:.9375rem; font-weight:700; line-height:1.7; color:var(--p-ink)}
.art-nav-link:hover .art-nav-title, .art-nav-link:focus-visible .art-nav-title{text-decoration:underline; text-underline-offset:4px; text-decoration-thickness:1px}
.art-nav-index{grid-column:1 / -1; margin-top:8px; font-size:.875rem; font-weight:500; color:var(--p-ink)}
@media (max-width:479px){ .art-nav{grid-template-columns:1fr} .art-nav-next{text-align:left} }

/* ---------- 一覧 (method トップ / カテゴリ / blog) ---------- */
.index-intro p{margin-top:0}
.idx-group{margin-top:72px}
.idx-group:first-of-type{margin-top:0}
.index-intro:not(:empty) + .idx-group{margin-top:64px}
.idx-h{
  position:relative; padding-left:19px; display:flex; align-items:baseline; gap:14px;
  font-size:clamp(1.25rem, 1.1rem + .5vw, 1.5rem); font-weight:700; line-height:1.5; letter-spacing:.02em;
  font-feature-settings:'palt'; color:var(--p-ink);
}
.idx-h::before{content:''; position:absolute; left:0; top:.6em; width:7px; height:7px; border:1.5px solid currentColor; border-radius:50%}
.idx-h a{color:inherit; text-decoration:none}
.idx-h a:hover, .idx-h a:focus-visible{text-decoration:underline; text-underline-offset:5px; text-decoration-thickness:1px}
.idx-count{font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.8125rem; font-weight:500; letter-spacing:.08em; color:var(--p-cap); font-variant-numeric:tabular-nums}
.idx-group .cards{margin-top:24px; grid-template-columns:repeat(auto-fill, minmax(280px, 1fr))}
.card-meta{margin-top:8px !important; font-family:'Inter','Helvetica Neue',Arial,sans-serif; font-size:.75rem; letter-spacing:.08em; color:var(--p-cap); font-variant-numeric:tabular-nums}
.art-meta a{color:inherit; text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:4px; text-decoration-color:rgba(113,130,156,.5)}
.art-meta a:hover{color:var(--sub)}