/* ============================================================
 * デザイントークン — 上質ミニマル
 * 白基調・余白たっぷり・細罫線。見出しは丸ゴシック（Zen Maru Gothic）で
 * 親しみやすく、本文は Noto Sans JP 行間広め、アクセントは深緑1色。
 * ロードマップ図（rm-*）は roadmap.sh 風の既存質感を維持し、対象外。
 * ============================================================ */
:root {
  /* 色 */
  --c-paper: #ffffff;
  --c-paper-alt: #fafaf7;
  --c-ink: #21272b;
  --c-ink-soft: rgba(33, 39, 43, 0.64);
  --c-ink-faint: rgba(33, 39, 43, 0.42);
  --c-accent: #1d4e3c;
  --c-accent-ink: #163d2f;
  --c-accent-soft: rgba(29, 78, 60, 0.07);
  --c-line: rgba(33, 39, 43, 0.10);
  --c-line-strong: rgba(33, 39, 43, 0.22);

  /* タイポグラフィ（1.25 スケール） */
  --font-serif: 'Zen Maru Gothic', 'Noto Sans JP', -apple-system, 'Hiragino Sans', sans-serif; /* 見出し用（丸ゴシック） */
  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Sans', sans-serif;
  --fs-xs: 12px; --fs-sm: 13px; --fs-base: 16px;
  --fs-lg: 20px; --fs-xl: 25px; --fs-2xl: 31px; --fs-3xl: 39px;
  --lh-body: 2.0; --lh-heading: 1.5; --lh-tight: 1.35;
  --ls-heading: 0.04em; --ls-body: 0.02em;

  /* スペーシング（4px 基数） */
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 20px;
  --sp-6: 24px; --sp-8: 32px; --sp-12: 48px; --sp-16: 64px; --sp-24: 96px;

  /* その他 */
  --radius-sm: 6px; --radius: 10px;
  --shadow-card: 0 1px 2px rgba(33, 39, 43, 0.05);
  --shadow-card-hover: 0 4px 16px rgba(33, 39, 43, 0.08);
  --header-h: 64px;
  --content-w: 720px; --wide-w: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-sans); background: var(--c-paper); color: var(--c-ink); letter-spacing: var(--ls-body); display: flex; flex-direction: column; height: 100vh; }
.layout { display: flex; flex: 1; min-height: 0; }

/* ===== グローバルヘッダー ===== */
.site-header {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: var(--sp-8);
  height: var(--header-h); padding: 0 var(--sp-8);
  background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
  flex-shrink: 0;
}
.brand { font-family: var(--font-serif); font-size: var(--fs-lg); font-weight: 700; letter-spacing: var(--ls-heading); color: var(--c-ink); text-decoration: none; white-space: nowrap; }
.brand .brand-sub { margin-left: 6px; font-size: var(--fs-sm); font-weight: 600; color: var(--c-accent); letter-spacing: 0.12em; }
.global-nav { display: flex; align-items: center; gap: var(--sp-2); height: 100%; }
.global-nav a {
  display: inline-flex; align-items: center; height: 100%;
  padding: 0 var(--sp-4); font-size: var(--fs-sm); font-weight: 500;
  color: var(--c-ink-soft); text-decoration: none;
  border-bottom: 2px solid transparent; transition: color 0.12s;
}
/* マニュアルのリンクは JS が差し込む。span をレイアウトから消して直接の子と同じ並びにする */
.global-nav #navManuals { display: contents; }
.global-nav a:hover { color: var(--c-ink); }
.global-nav a.active { color: var(--c-accent); border-bottom-color: var(--c-accent); font-weight: 600; }
.header-user { margin-left: auto; font-size: var(--fs-xs); color: var(--c-ink-faint); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 220px; }
.nav-toggle { display: none; margin-left: var(--sp-2); width: 40px; height: 40px; border: 1px solid var(--c-line); border-radius: var(--radius-sm); background: var(--c-paper); font-size: 18px; color: var(--c-ink); cursor: pointer; }

/* ===== ビュー共通 ===== */
.view-wrap { max-width: var(--content-w); margin: 0 auto; padding: var(--sp-12) var(--sp-8) var(--sp-24); }
.view-wrap.view-wide { max-width: var(--wide-w); }
.page-head { margin-bottom: var(--sp-8); padding-bottom: var(--sp-6); border-bottom: 1px solid var(--c-line); }
.page-title { font-family: var(--font-serif); font-size: var(--fs-2xl); font-weight: 600; letter-spacing: var(--ls-heading); line-height: var(--lh-tight); color: var(--c-ink); }
.page-desc { margin-top: var(--sp-3); font-size: var(--fs-sm); color: var(--c-ink-soft); line-height: 1.8; }

/* パンくず */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: var(--sp-4); font-size: var(--fs-xs); color: var(--c-ink-faint); }
.breadcrumb a { color: var(--c-ink-faint); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-accent); text-decoration: underline; }
.breadcrumb b { color: var(--c-ink-soft); font-weight: 500; max-width: 24em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ===== タブ（お役立ち記事の絞り込み） ===== */
.list-tabs { display: flex; flex-wrap: wrap; gap: var(--sp-1); margin: calc(-1 * var(--sp-4)) 0 var(--sp-8); border-bottom: 1px solid var(--c-line); }
.list-tabs a {
  padding: var(--sp-2) var(--sp-4) var(--sp-3); font-size: var(--fs-sm); font-weight: 500;
  color: var(--c-ink-soft); text-decoration: none;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.list-tabs a:hover { color: var(--c-ink); }
.list-tabs a.active { color: var(--c-accent); border-bottom-color: var(--c-accent); font-weight: 600; }

/* ===== カード ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--sp-6); }
.card {
  display: flex; flex-direction: column; overflow: hidden;
  border: 1px solid var(--c-line); border-radius: var(--radius);
  background: var(--c-paper); text-decoration: none; color: inherit;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--c-line-strong); box-shadow: var(--shadow-card-hover); }
.card-thumb { position: relative; aspect-ratio: 1.91 / 1; overflow: hidden; background: var(--ec-bg); display: flex; align-items: center; justify-content: center; }
.card-thumb-pattern {
  position: absolute; inset: -12%;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr));
  align-content: center; justify-items: center; gap: 8px;
  font-size: 30px; line-height: 1.1; opacity: 0.26;
  pointer-events: none; user-select: none;
}
.card-thumb-pattern span:nth-child(even) { transform: translateY(10px) rotate(-8deg); }
.card-thumb-pattern span:nth-child(3n) { transform: translateY(-8px) rotate(6deg); }
.card-thumb-card {
  position: relative; z-index: 1; max-width: 82%;
  background: #fff; border-top: 5px solid var(--ec-band); border-bottom: 5px solid var(--ec-band);
  padding: 12px 16px; text-align: center;
  box-shadow: 0 1px 8px rgba(15, 23, 42, 0.08);
}
.card-thumb-title { font-family: var(--font-serif); font-size: var(--fs-sm); font-weight: 600; line-height: 1.5; color: #2b2b2b; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-thumb-title .ec-accent { color: var(--ec-accent); font-size: 1.15em; }
.card-body { display: flex; flex-direction: column; gap: var(--sp-2); padding: var(--sp-4) var(--sp-5) var(--sp-5); flex: 1; }
.card-label { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-xs); color: var(--c-ink-faint); letter-spacing: 0.05em; }
.card-badge { font-size: var(--fs-xs); padding: 2px 8px; border-radius: 10px; }
.card-badge.in-progress { background: var(--c-accent-soft); color: var(--c-accent); }
.card-badge.completed { background: var(--c-accent); color: #fff; }
.card-title { font-family: var(--font-serif); font-size: var(--fs-lg); font-weight: 600; letter-spacing: 0.02em; line-height: var(--lh-tight); color: var(--c-ink); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-summary { font-size: var(--fs-sm); color: var(--c-ink-soft); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-reason { margin-top: auto; align-self: flex-start; font-size: var(--fs-xs); font-weight: 600; color: var(--c-accent); background: var(--c-accent-soft); padding: 3px 10px; border-radius: 12px; }
.empty-note { font-size: var(--fs-sm); color: var(--c-ink-faint); }

/* ===== スキルカタログ ===== */
/* カードの外枠は .card を流用し、リンクではなくボタン内蔵の箱として使う */
.skill-card { cursor: default; }
.skill-card:hover { transform: none; box-shadow: var(--shadow-card); }
.skill-thumb {
  aspect-ratio: 2.6 / 1; background: var(--ec-bg);
  display: flex; align-items: center; justify-content: center;
}
.skill-mono {
  font-family: var(--font-serif); font-size: var(--fs-2xl); font-weight: 700;
  color: var(--ec-accent); line-height: 1;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: var(--sp-1); }
.skill-tag {
  font-size: var(--fs-xs); color: var(--c-ink-soft);
  background: var(--c-paper-alt); border: 1px solid var(--c-line);
  padding: 2px 8px; border-radius: 10px;
}
.skill-meta { font-size: var(--fs-xs); color: var(--c-ink-faint); }
.skill-foot { margin-top: auto; padding-top: var(--sp-3); }
.skill-foot .skill-install { width: 100%; padding: var(--sp-2) var(--sp-4); }
.skill-note {
  display: none; font-size: var(--fs-xs); line-height: 1.7; color: var(--c-ink-soft);
  background: var(--c-paper-alt); border-radius: var(--radius-sm); padding: var(--sp-2) var(--sp-3);
}
.skill-note.is-visible { display: block; }

/* ===== HOME ===== */
.home-hero { border-bottom: none; padding-bottom: 0; margin-bottom: var(--sp-8); }
.home-grid { display: grid; grid-template-columns: minmax(320px, 5fr) 7fr; gap: var(--sp-12); align-items: start; margin-bottom: var(--sp-16); }
.home-sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--sp-4); border-bottom: 1px solid var(--c-line); margin-bottom: var(--sp-4); }
.home-sec-head .home-sec-title { border-bottom: none; margin-bottom: 0; }
.home-sec-title { font-family: var(--font-serif); font-size: var(--fs-xl); font-weight: 600; letter-spacing: var(--ls-heading); color: var(--c-ink); margin-bottom: var(--sp-4); padding-bottom: var(--sp-2); border-bottom: 1px solid var(--c-line); }
.home-sec-link { font-size: var(--fs-sm); color: var(--c-accent); text-decoration: none; white-space: nowrap; }
.home-sec-link:hover { text-decoration: underline; }
.home-roadmap { min-width: 0; max-height: 720px; overflow-y: auto; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 0 var(--sp-5) var(--sp-5); }
.home-status { position: sticky; top: var(--sp-6); }
.home-reco { margin-top: var(--sp-4); }
.home-reco .card-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

/* 学びの状況カード */
.status-card { display: flex; flex-direction: column; gap: var(--sp-6); border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-paper-alt); padding: var(--sp-6); }
.status-row { display: flex; flex-direction: column; gap: var(--sp-2); }
.status-label { font-size: var(--fs-xs); font-weight: 700; color: var(--c-ink-faint); letter-spacing: 0.08em; }
.status-pct { display: flex; align-items: baseline; gap: 4px; }
.status-pct b { font-family: var(--font-serif); font-size: var(--fs-3xl); font-weight: 600; line-height: 1; color: var(--c-ink); }
.status-pct small { font-size: var(--fs-base); color: var(--c-ink-soft); }
.status-count { margin-left: var(--sp-3); font-size: var(--fs-xs); color: var(--c-ink-faint); }
.status-bar { height: 4px; border-radius: 4px; background: rgba(33, 39, 43, 0.08); overflow: hidden; }
.status-bar i { display: block; height: 100%; background: var(--c-accent); border-radius: 4px; transition: width 0.3s; }
.status-stage { display: flex; align-items: center; gap: 2px; }
.stage-step { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border: 1.5px solid var(--c-line-strong); border-radius: 50%; font-size: var(--fs-sm); color: var(--c-ink-faint); background: var(--c-paper); flex-shrink: 0; }
.stage-step.past { background: var(--c-accent-soft); border-color: var(--c-accent); color: var(--c-accent); }
.stage-step.now { background: var(--c-accent); border-color: var(--c-accent); color: #fff; font-weight: 700; }
.stage-step-line { flex: 1; max-width: 26px; height: 1.5px; background: var(--c-line-strong); }
.status-stage-name { font-size: var(--fs-sm); font-weight: 600; color: var(--c-ink); }
.status-recent { display: flex; align-items: center; gap: var(--sp-2); padding: var(--sp-2) 0; font-size: var(--fs-sm); color: var(--c-ink); text-decoration: none; border-bottom: 1px solid var(--c-line); }
.status-recent:last-of-type { border-bottom: none; }
.status-recent:hover .status-recent-title { color: var(--c-accent); text-decoration: underline; }
.status-recent-icon { flex-shrink: 0; }
.status-recent-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status-recent-time { margin-left: auto; flex-shrink: 0; font-size: var(--fs-xs); color: var(--c-ink-faint); }
.btn-resume { align-self: flex-start; display: inline-block; padding: var(--sp-2) var(--sp-5); background: var(--c-accent); color: #fff; border-radius: var(--radius-sm); font-size: var(--fs-sm); font-weight: 600; text-decoration: none; }
.btn-resume:hover { background: var(--c-accent-ink); }

/* HOME内の縮小ロードマップ（縦積み・接続線なし。rm-* の質感は既存のまま） */
.rm-compact .rm-rows { gap: 22px; }
.rm-compact .rm-row { grid-template-columns: 1fr; gap: 8px; justify-items: center; }
.rm-compact .rm-side.left, .rm-compact .rm-side.right { align-items: center; flex-direction: row; flex-wrap: wrap; justify-content: center; gap: 8px; }
.rm-compact .rm-svg { display: none; }
.rm-compact .rm-node.trunk { width: 100%; max-width: 380px; font-size: 14px; padding: 12px 14px; }
.rm-compact .rm-side .rm-node { font-size: 12px; padding: 5px 10px; }
.rm-compact .rm-stage-head { margin: 14px 0 -6px; }

@media (max-width: 1024px) {
  .home-grid { grid-template-columns: 1fr; gap: var(--sp-8); }
}
@media (max-width: 768px) {
  .site-header { padding: 0 var(--sp-4); gap: var(--sp-3); }
  .header-user { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }
  .global-nav { display: none; }
  .global-nav.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 29;
    height: auto; background: var(--c-paper); border-bottom: 1px solid var(--c-line);
    box-shadow: 0 8px 24px rgba(33, 39, 43, 0.08);
  }
  .global-nav.open a { height: auto; padding: var(--sp-4); border-bottom: 1px solid var(--c-line); }
  .global-nav.open a.active { border-bottom: 1px solid var(--c-line); background: var(--c-accent-soft); }
  .view-wrap { padding: var(--sp-8) var(--sp-4) var(--sp-16); }
}

/* Main content */
.main { flex: 1; overflow-y: auto; background: #fff; }
.content-header { padding: var(--sp-16) var(--sp-8) var(--sp-2); max-width: 720px; margin: 0 auto; }
.content-header h2 { font-size: var(--fs-2xl); font-weight: 600; color: var(--c-ink); margin-bottom: 12px; letter-spacing: var(--ls-heading); line-height: var(--lh-tight); }
.content-header .section-type { display: inline-block; font-size: 11px; font-weight: 500; padding: 3px 8px; border-radius: 3px; margin-top: 8px; letter-spacing: 0.02em; text-transform: uppercase; }
.section-type.lecture { background: var(--c-accent-soft); color: var(--c-accent); }
.section-type.practice { background: rgba(245,93,0,0.13); color: #e8590c; }

/* ===== アイキャッチ（note風・HTML/CSSのみ。画像は使わない） =====
   淡い地色に記事の絵文字を薄く敷き詰め、中央に白いカードを置く。
   カードの上下に太いライン、上部に吹き出しラベル、見出しは一部をアクセント色にする。 */
.eyecatch { max-width: 720px; margin: 18px auto 0; padding: 0 32px; box-sizing: border-box; }
.eyecatch-bg {
  position: relative; overflow: hidden; border-radius: 10px;
  padding: 34px 30px;
  background: var(--ec-bg);
  display: flex; align-items: center; justify-content: center;
}
/* 背景に敷き詰める絵文字。装飾なので読み上げ対象から外す */
.eyecatch-pattern {
  position: absolute; inset: -10%;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
  align-content: center; justify-items: center; gap: 10px;
  font-size: 54px; line-height: 1.1;
  opacity: 0.28;
  pointer-events: none; user-select: none;
}
.eyecatch-pattern span:nth-child(even) { transform: translateY(16px) rotate(-8deg); }
.eyecatch-pattern span:nth-child(3n) { transform: translateY(-12px) rotate(6deg); }

.eyecatch-card {
  position: relative; z-index: 1;
  width: 100%; max-width: 520px;
  background: #fff;
  border-top: 9px solid var(--ec-band);
  border-bottom: 9px solid var(--ec-band);
  padding: 30px 26px 26px;
  text-align: center;
  box-shadow: 0 2px 14px rgba(15,23,42,0.08);
}
/* 吹き出しラベル（下向きの三角つき） */
.eyecatch-label {
  position: relative; display: inline-block;
  padding: 6px 20px; border-radius: 7px;
  background: var(--ec-band); color: #fff;
  font-size: 13px; font-weight: 700; letter-spacing: 0.06em;
  margin-bottom: 20px;
}
.eyecatch-label::after {
  content: ''; position: absolute; left: 50%; bottom: -8px;
  transform: translateX(-50%);
  border-left: 9px solid transparent; border-right: 9px solid transparent;
  border-top: 9px solid var(--ec-band);
}
.eyecatch-title {
  font-size: 30px; font-weight: 800; line-height: 1.42;
  color: #2b2b2b; letter-spacing: 0.01em;
}
.eyecatch-title .ec-accent { color: var(--ec-accent); font-size: 1.28em; }
.eyecatch-sub { margin-top: 14px; font-size: 12px; color: rgba(43,43,43,0.5); }

@media (max-width: 768px) {
  .eyecatch { padding: 0 20px; margin-top: 12px; }
  .eyecatch-bg { padding: 22px 16px; }
  .eyecatch-pattern { font-size: 38px; grid-template-columns: repeat(auto-fill, minmax(62px, 1fr)); }
  .eyecatch-card { padding: 22px 16px 20px; border-top-width: 7px; border-bottom-width: 7px; }
  .eyecatch-title { font-size: 21px; }
  .eyecatch-label { font-size: 12px; padding: 5px 15px; margin-bottom: 16px; }
}

.content-body { padding: 32px 32px 160px; max-width: 720px; margin: 0 auto; line-height: 1.8; font-size: 16px; color: var(--c-ink); letter-spacing: 0.02em; }

/* Summary box (ゴール・ポイント・所要時間) */
.summary-box { background: #fef9ec; border: 1px solid #f0d361; border-radius: 8px; padding: 20px 24px; margin: 0 0 40px; font-size: 14px; line-height: 1.75; }
.content-body .summary-box h2 { font-size: 13px !important; font-weight: 600; margin: 0 0 4px !important; color: #7c6b1a; letter-spacing: 0.02em; }
.content-body .summary-box blockquote { border-left: 2px solid #d4a72c; color: #5c4d0e; margin: 4px 0 12px; padding: 2px 12px; font-size: 13px; }
.content-body .summary-box ul { margin: 4px 0 12px; padding-left: 20px; }
.content-body .summary-box li { color: #4a3f0f; font-size: 13px; margin: 2px 0; }
.content-body .summary-box p { color: #5c4d0e; margin: 4px 0 12px; font-size: 13px; }
.summary-box hr { display: none; }

/* Images & Video */
.content-body img { display: block; max-width: 100%; height: auto; border-radius: 6px; margin: 40px auto; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.content-body video { display: block; max-width: 100%; height: auto; border-radius: 6px; margin: 40px auto; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.tweet-embed { margin: 28px 0; }

/* Reference card */
.ref-card { display: flex; border: 1px solid var(--c-line); border-radius: 8px; overflow: hidden; margin: 28px 0; text-decoration: none; color: inherit; transition: box-shadow 0.15s; }
.ref-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.ref-card-icon { width: 48px; min-height: 64px; background: var(--c-accent); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 22px; flex-shrink: 0; }
.ref-card-body { padding: 14px 18px; flex: 1; min-width: 0; }
.ref-card-title { font-size: var(--fs-sm); font-weight: 600; color: var(--c-ink); margin: 0 0 2px; }
.ref-card-desc { font-size: 12px; color: var(--c-ink-soft); margin: 0; line-height: 1.5; }
.ref-card-source { font-size: 11px; color: var(--c-ink-faint); margin-top: 4px; }
.content-body h2 { font-size: var(--fs-xl); font-weight: 700; margin: 64px 0 20px; color: var(--c-ink); line-height: 1.5; letter-spacing: -0.01em; }
.content-body h3 { font-size: var(--fs-lg); font-weight: 700; margin: 48px 0 16px; color: var(--c-ink); line-height: 1.5; }
.content-body h4 { font-size: var(--fs-base); font-weight: 700; margin: 32px 0 12px; color: var(--c-ink); line-height: 1.5; }
.content-body ul, .content-body ol { padding-left: 28px; margin: 0 0 28px; }
.content-body li { margin: 8px 0; padding-left: 4px; line-height: 1.8; }
.content-body li::marker { color: var(--c-ink-faint); }
.content-body li ul, .content-body li ol { margin: 8px 0 0; }
.content-body p { margin: 0 0 28px; }
.content-body strong { font-weight: 600; }
.content-body code { background: rgba(135,131,120,0.15); padding: 2px 6px; border-radius: 4px; font-size: 87.5%; font-family: 'SFMono-Regular', Menlo, Consolas, monospace; color: var(--c-ink); }
.content-body pre { background: #f7f6f3; border-radius: 6px; padding: 20px 24px; margin: 28px 0; overflow-x: auto; line-height: 1.6; }
.content-body pre code { background: none; color: var(--c-ink); padding: 0; font-size: 13.5px; }

/* OS切替タブ。MD側は <div class="os-tabs"><div class="os-panel" data-os="macOS"> で書く */
.content-body .os-tabs { border: 1px solid #e3e1dc; border-radius: 6px; margin: 28px 0; overflow: hidden; }
.content-body .os-tabbar { display: flex; gap: 0; background: #f2f1ee; border-bottom: 1px solid #e3e1dc; }
.content-body .os-tab { appearance: none; border: 0; background: none; cursor: pointer; padding: 11px 20px; font: inherit; font-size: 14px; font-weight: 600; color: var(--c-ink-soft); border-bottom: 2px solid transparent; }
.content-body .os-tab:hover { color: var(--c-ink); }
.content-body .os-tab.active { color: var(--c-ink); background: #fff; border-bottom-color: var(--c-accent); }
.content-body .os-panel { display: none; padding: 4px 20px; }
.content-body .os-panel.active { display: block; }
.content-body .os-panel > :first-child { margin-top: 20px; }
.content-body .os-panel > :last-child { margin-bottom: 20px; }
.content-body a { color: var(--c-ink); text-decoration: underline; text-decoration-color: var(--c-ink-faint); text-underline-offset: 3px; }
.content-body a:hover { text-decoration-color: var(--c-ink); }

/* 段落まるごとが1本のリンクのとき（enhanceLinkCards）。横長のカードで見せる */
.content-body a.link-card {
  display: flex; align-items: center; gap: var(--sp-4);
  margin: var(--sp-5) 0; padding: var(--sp-4) var(--sp-5);
  border: 1px solid var(--c-line); border-radius: 10px;
  background: var(--c-paper-alt); text-decoration: none; color: inherit;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.content-body a.link-card:hover {
  border-color: var(--c-line-strong); box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px); text-decoration: none;
}
.link-card-icon {
  flex: none; width: 44px; height: 44px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; background: var(--c-accent-soft);
}
.link-card-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.link-card-label {
  font-size: var(--fs-xs); letter-spacing: 0.05em; color: var(--c-ink-faint);
}
.link-card-title {
  font-family: var(--font-serif); font-size: var(--fs-base); font-weight: 600;
  line-height: var(--lh-tight); color: var(--c-ink);
}
.link-card-desc {
  font-size: var(--fs-sm); color: var(--c-ink-soft); line-height: 1.6;
}
.link-card-arrow { margin-left: auto; flex: none; color: var(--c-ink-faint); font-size: var(--fs-lg); }
.content-body a.link-card:hover .link-card-arrow { color: var(--c-accent); }
.content-body a.link-card.is-external .link-card-icon { background: var(--c-line); }

@media (max-width: 600px) {
  .content-body a.link-card { gap: var(--sp-3); padding: var(--sp-3) var(--sp-4); }
  .link-card-icon { width: 36px; height: 36px; font-size: 18px; }
}
.content-body blockquote { border-left: 3px solid #d1d1d0; padding: 8px 20px; margin: 28px 0; color: var(--c-ink-soft); font-size: 15px; }
/* ===== コールアウト =====
   ポイント（黄）= 覚えて帰ってほしいこと / トラブル（赤）= 詰まったときの逃げ道。
   ポイントは blockquote に enhanceCallouts() がクラスを付ける（本文はMarkdownのまま書ける）。 */
.content-body blockquote.callout-point {
  border: 1px solid #f0d361; border-left: 4px solid #d4a72c; border-radius: 8px;
  background: #fef9ec; color: #5c4d0e; padding: 16px 20px; margin: 28px 0;
}
.content-body blockquote.callout-point strong { color: #7c6b1a; }
.content-body blockquote.callout-point > :first-child { margin-top: 0; }
.content-body blockquote.callout-point > :last-child { margin-bottom: 0; }
.content-body blockquote.callout-point ul { margin: 10px 0; padding-left: 20px; }
.content-body blockquote.callout-point li { margin: 3px 0; }

/* 注意（赤・折りたたまない）= 動かない／壊れる可能性がある話 */
.content-body blockquote.callout-error {
  border: 1px solid #e8b4b0; border-left: 4px solid #c9524a; border-radius: 8px;
  background: #fdf4f3; color: #7a2f29; padding: 16px 20px; margin: 28px 0;
}
.content-body blockquote.callout-error strong { color: #a3312a; }
.content-body blockquote.callout-error > :first-child { margin-top: 0; }
.content-body blockquote.callout-error > :last-child { margin-bottom: 0; }
.content-body blockquote.callout-error ul { margin: 10px 0; padding-left: 20px; }
.content-body blockquote.callout-error li { margin: 3px 0; }

/* トラブル（赤）は開閉式。MDに <details class="callout-trouble"> と書いて使う。
   目次も details を使っているので、セレクタは必ず .callout-trouble まで絞ること。 */
.content-body details.callout-trouble {
  border: 1px solid #e8b4b0; border-left: 4px solid #c9524a; border-radius: 8px;
  background: #fdf4f3; margin: 28px 0;
}
.content-body details.callout-trouble > summary {
  cursor: pointer; padding: 12px 18px; font-size: 14px; font-weight: 600;
  color: #a3312a; list-style: none; display: flex; align-items: center; gap: 8px;
}
.content-body details.callout-trouble > summary::-webkit-details-marker { display: none; }
.content-body details.callout-trouble > summary::before { content: '▸'; color: #c9524a; font-size: 12px; }
.content-body details.callout-trouble[open] > summary::before { content: '▾'; }
.content-body details.callout-trouble[open] > summary { border-bottom: 1px solid #e8b4b0; }
.content-body details.callout-trouble > :not(summary) { padding-left: 18px; padding-right: 18px; font-size: 15px; }
.content-body details.callout-trouble > :not(summary):first-of-type { margin-top: 14px; }
.content-body details.callout-trouble > :not(summary):last-child { margin-bottom: 14px; }
.content-body details.callout-trouble strong { color: #a3312a; }

/* プロンプト（青）も開閉式。MDに <details class="callout-prompt"> と書いて使う。
   中身は enhancePrompts() がコピーボタン付きカードに差し替えるので、
   ここで持つのは「枠」と「開閉ボタンの見た目」だけにする。 */
.content-body details.callout-prompt {
  border: 1px solid #c5d6f2; border-left: 4px solid #2f6df6; border-radius: 8px;
  background: #f5f8fe; margin: 20px 0 28px;
}
.content-body details.callout-prompt > summary {
  cursor: pointer; padding: 12px 18px; font-size: 14px; font-weight: 600;
  color: #1f4fb8; list-style: none; display: flex; align-items: center; gap: 8px;
}
.content-body details.callout-prompt > summary::-webkit-details-marker { display: none; }
.content-body details.callout-prompt > summary::before { content: '▸'; color: #2f6df6; font-size: 12px; }
.content-body details.callout-prompt[open] > summary::before { content: '▾'; }
.content-body details.callout-prompt > summary:hover { background: #eaf0fe; border-radius: 4px; }
.content-body details.callout-prompt[open] > summary { border-bottom: 1px solid #c5d6f2; }
.content-body details.callout-prompt > :not(summary) { padding: 0 8px; }
.content-body details.callout-prompt > :not(summary):first-of-type { margin-top: 14px; }
.content-body details.callout-prompt > :not(summary):last-child { margin-bottom: 14px; }
/* カード側は既に枠を持っているので、二重の枠に見えないよう内側は余白だけにする */
.content-body details.callout-prompt .prompt-card { margin: 0; }
.table-wrap { overflow-x: auto; margin: 28px 0; -webkit-overflow-scrolling: touch; }
.content-body .table-wrap table { margin: 0; }
.content-body table { border-collapse: collapse; margin: 28px 0; width: 100%; font-size: 14px; }
.content-body th, .content-body td { border: 1px solid var(--c-line); padding: 8px 12px; text-align: left; }
.content-body th { background: #f7f6f3; font-weight: 600; font-size: 13px; color: var(--c-ink-soft); }
.content-body hr { border: none; border-top: 1px solid var(--c-line); margin: 48px 0; }

/* Action bar */
.action-bar { position: fixed; bottom: 0; right: 0; left: 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(8px); border-top: 1px solid var(--c-line); padding: 12px 96px; display: flex; align-items: center; gap: 10px; z-index: 10; }
.btn { padding: 6px 16px; border: none; border-radius: 6px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.12s; font-family: inherit; }
.btn-start { background: var(--c-accent); color: #fff; }
.btn-start:hover { background: var(--c-accent-ink); }
.btn-complete { background: var(--c-accent); color: #fff; }
.btn-complete:hover { background: var(--c-accent-ink); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }
.action-status { font-size: 13px; color: var(--c-ink-faint); margin-left: auto; }
.action-status .time { color: var(--c-ink); font-weight: 500; }

/* Modal */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(15,15,15,0.6); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal { background: #fff; border-radius: 12px; padding: 36px 32px 28px; width: 380px; max-width: 90vw; text-align: center; box-shadow: 0 0 0 1px rgba(15,15,15,0.05), 0 3px 6px rgba(15,15,15,0.1), 0 9px 24px rgba(15,15,15,0.2); }
.modal-icon { font-size: 36px; margin-bottom: 8px; }
.modal-title { font-size: 16px; font-weight: 600; margin-bottom: 6px; color: var(--c-ink); }
.modal-desc { font-size: var(--fs-sm); color: var(--c-ink-soft); margin-bottom: 24px; line-height: 1.5; }
.modal-actions { display: flex; gap: 8px; justify-content: center; }
.modal-btn-cancel { background: rgba(33,39,43,0.04); color: var(--c-ink); border: 1px solid var(--c-line); }
.modal-btn-cancel:hover { background: var(--c-line); }
.modal-btn-confirm { min-width: 120px; }
.modal-btn-confirm.start { background: var(--c-accent); color: #fff; }
.modal-btn-confirm.start:hover { background: var(--c-accent-ink); }
.modal-btn-confirm.complete { background: var(--c-accent); color: #fff; }
.modal-btn-confirm.complete:hover { background: var(--c-accent-ink); }

/* ============================================
 * Skeleton Loading (Shimmer)
 * ============================================ */
@keyframes shimmer {
  0%   { background-position: -800px 0; }
  100% { background-position:  800px 0; }
}
.skeleton {
  background: linear-gradient(90deg, rgba(33,39,43,0.04) 0%, var(--c-line) 40%, rgba(33,39,43,0.04) 80%);
  background-size: 800px 100%;
  animation: shimmer 1.6s linear infinite;
  border-radius: 4px;
  display: block;
}
.skeleton-title  { height: 36px; width: 60%; margin: 0 0 16px; border-radius: 6px; }
.skeleton-badge  { height: 18px; width: 64px; margin: 0 0 32px; border-radius: 3px; }
.skeleton-line   { height: 14px; margin: 0 0 14px; border-radius: 4px; }
.skeleton-line.w-95 { width: 95%; }
.skeleton-line.w-88 { width: 88%; }
.skeleton-line.w-70 { width: 70%; }
.skeleton-line.w-45 { width: 45%; }
.skeleton-image  { height: 220px; width: 100%; margin: 32px 0; border-radius: 8px; }
.skeleton-block  { padding: 0; }

.fade-in  { animation: fadeIn 0.28s ease-out; }
.fade-out { animation: fadeOut 0.16s ease-in; }
@keyframes fadeIn  { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }

.load-error {
  margin: 32px auto; max-width: 560px; padding: 16px 20px;
  background: #fff4f4; border: 1px solid #f5c6c6; border-radius: 8px;
  color: #a8322f; font-size: 14px; line-height: 1.6;
}
.load-error button {
  margin-top: 10px; padding: 6px 14px; border: 1px solid #a8322f;
  background: #fff; color: #a8322f; border-radius: 6px; cursor: pointer; font-size: 13px;
}

/* Mermaid */
.mermaid-block { margin: 28px 0; padding: 16px; border: 1px solid var(--c-line); border-radius: 8px; background: #fcfcfb; overflow-x: auto; text-align: center; }
.mermaid-block svg { max-width: 100%; height: auto; }
.mermaid-error { margin: 28px 0; padding: 14px 16px; border: 1px solid #f5c6c6; border-radius: 8px; background: #fff4f4; color: #a8322f; font-size: 13px; }

/* Prompt cards */
.prompt-card { margin: 28px 0; border: 1px solid var(--c-line); border-radius: 10px; overflow: hidden; background: #fff; }
.prompt-tabs { display: flex; align-items: center; gap: 4px; padding: 8px 10px; background: #f7f6f3; border-bottom: 1px solid var(--c-line); }
.prompt-tab { padding: 5px 12px; font-size: 13px; font-weight: 500; color: var(--c-ink-soft); background: transparent; border: none; border-radius: 6px; cursor: pointer; }
.prompt-tab:hover { background: rgba(33,39,43,0.04); }
.prompt-tab.active { background: #fff; color: var(--c-ink); box-shadow: 0 1px 2px rgba(15,15,15,0.08); }
.prompt-copy { margin-left: auto; padding: 5px 12px; font-size: 12px; font-weight: 500; color: var(--c-accent); background: transparent; border: 1px solid rgba(29,78,60,0.35); border-radius: 6px; cursor: pointer; }
.prompt-copy:hover { background: var(--c-accent-soft); }
.prompt-copy.copied { color: var(--c-accent); border-color: var(--c-accent); }
.prompt-run { margin-left: 6px; padding: 5px 12px; font-size: 12px; font-weight: 500; color: #fff; background: var(--c-accent); border: 1px solid var(--c-accent); border-radius: 6px; cursor: pointer; }
.prompt-run:hover { background: var(--c-accent-ink); border-color: var(--c-accent-ink); }
.prompt-run[disabled] { opacity: 0.55; cursor: default; }
.prompt-note { display: none; padding: 9px 14px; font-size: 12px; line-height: 1.7; color: var(--c-ink-soft); background: #fbfbfa; border-top: 1px solid var(--c-line); }
.prompt-note.is-visible { display: block; }
.prompt-pane { display: none; }
.prompt-pane.active { display: block; }
.prompt-pane pre { margin: 0; border: none; border-radius: 0; background: #fbfbfa; }
.prompt-hint { padding: 9px 14px; font-size: 12px; line-height: 1.7; color: var(--c-ink-soft); background: #fbfbfa; border-top: 1px solid var(--c-line); }
.prompt-var { padding: 1px 5px; border-radius: 4px; background: rgba(232,89,12,0.12); color: var(--c-accent); font-weight: 600; }

/* ===== Roadmap — roadmap.sh 準拠のビジュアル =====
   黄色い付箋のようなノード + 黒い枠 + オフセット影 + 手書き風フォント。
   接続線は rough.js でラフに描く（drawRoadmapLines）。 */
.content-body.roadmap-mode { max-width: 1200px; padding-left: 20px; padding-right: 20px; }
.rm-wrap { position: relative; margin: 34px 0 0; font-family: 'Zen Maru Gothic', 'Balsamiq Sans', -apple-system, 'Hiragino Sans', 'Noto Sans JP', sans-serif; font-weight: 500; }
.rm-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; overflow: visible; }
.rm-svg path { fill: none; stroke: #2b2b2b; }
.rm-rows { position: relative; z-index: 1; display: flex; flex-direction: column; gap: 46px; }
.rm-row { display: grid; grid-template-columns: minmax(0, 1fr) 390px minmax(0, 1fr); align-items: center; gap: 28px; }
.rm-side { display: flex; flex-direction: column; gap: 12px; }
.rm-side.left { align-items: flex-end; }
.rm-side.right { align-items: flex-start; }

/* ノード共通: 黒枠 + 右下オフセット影（roadmap.sh の質感） */
.rm-node { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border: 2px solid #2b2b2b; border-radius: 5px; background: #e5d0ff; color: #2b2b2b; font-family: inherit; font-size: 14px; line-height: 1.4; cursor: pointer; text-align: left; max-width: 100%; box-shadow: 3px 3px 0 #2b2b2b; transition: transform 0.08s ease, box-shadow 0.08s ease; }
.rm-node:hover { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 #2b2b2b; }
.rm-node:active { transform: translate(1px, 1px); box-shadow: 1px 1px 0 #2b2b2b; }
.rm-node .rm-ico { font-size: 15px; flex-shrink: 0; }
.rm-side .rm-node { width: max-content; max-width: 100%; }

/* 幹（Lv）は黄色で大きく */
.rm-node.trunk { width: 390px; justify-content: center; align-items: flex-start; padding: 15px 18px; font-size: 16px; font-weight: 700; text-align: center; background: #ffe599; box-shadow: 4px 4px 0 #2b2b2b; }
.rm-node.trunk:hover { box-shadow: 6px 6px 0 #2b2b2b; }

/* 参考記事（☆・順不同）は白地で控えめに */
.rm-node.ref { background: #fff; font-size: 13px; box-shadow: 2px 2px 0 #2b2b2b; }
.rm-node.ref .rm-star { font-size: 12px; color: rgba(43,43,43,0.5); flex-shrink: 0; }

/* 状態 */
.rm-node.completed { background: #b7e1a1; }
.rm-node.in-progress { background: #a9d3f0; }
.rm-node.pending { background: #ececec; border-style: dashed; color: rgba(43,43,43,0.55); box-shadow: none; }
.rm-node.pending:hover { transform: none; box-shadow: none; }
.rm-node.active-node { outline: 3px dashed #e8590c; outline-offset: 3px; }
.rm-node-static { cursor: default; }
.rm-node-static:hover { transform: none; }
.rm-node-static.trunk:hover { box-shadow: 4px 4px 0 #2b2b2b; }

/* Lv バッジと説明 */
.rm-lv { flex-shrink: 0; font-size: 12px; font-weight: 700; padding: 2px 8px; border: 1.5px solid #2b2b2b; border-radius: 4px; background: #fff; color: #2b2b2b; }
.rm-opt { flex-shrink: 0; font-size: 11px; font-weight: 700; padding: 2px 7px; border: 1.5px dashed rgba(43,43,43,0.45); border-radius: 4px; background: #fff; color: rgba(43,43,43,0.6); }
.rm-lv-title { display: block; }
.rm-lv-title em { display: block; font-style: normal; font-size: 12px; font-weight: 400; color: rgba(43,43,43,0.62); margin-top: 4px; }
.rm-pending { display: block; font-size: 12px; font-weight: 700; color: #a15c00; margin-top: 5px; }

/* 導入事例（📎） */
.rm-node.case { background: #ffd9e8; font-size: 13px; }
.rm-case-mark { font-size: 12px; flex-shrink: 0; }

/* 段階見出し */
.rm-stage-head { display: flex; align-items: center; gap: 12px; margin: 30px 0 -14px; }
.rm-stage-num { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border: 2px solid #2b2b2b; border-radius: 50%; background: #ffe599; box-shadow: 3px 3px 0 #2b2b2b; font-size: 17px; font-weight: 700; color: #2b2b2b; }
.rm-stage-title { font-size: 18px; font-weight: 700; color: #2b2b2b; }
.rm-stage-tagline { font-size: 13px; color: rgba(43,43,43,0.6); padding: 3px 10px; border: 1.5px dashed rgba(43,43,43,0.35); border-radius: 4px; white-space: nowrap; }
.rm-stage-head::after { content: ''; flex: 1; border-bottom: 2px dashed rgba(43,43,43,0.18); }

/* 入口ラベル */
.rm-first-label { display: inline-block; font-size: 12px; font-weight: 700; color: #b23c00; margin-bottom: 7px; padding: 2px 9px; border: 1.5px solid #b23c00; border-radius: 4px; background: #fff3e8; }
.rm-row-single .rm-trunk { display: flex; flex-direction: column; align-items: center; }

/* 概念タグ・凡例 */
.rm-concepts { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin: 16px 0 0; }
.rm-concepts-label { font-size: 13px; color: rgba(43,43,43,0.6); margin-right: 4px; }
.rm-concept { font-size: 13px; padding: 3px 12px; border: 1.5px solid #2b2b2b; border-radius: 14px; background: #fff; color: #2b2b2b; box-shadow: 2px 2px 0 #2b2b2b; }
.rm-legend { display: flex; flex-wrap: wrap; gap: 16px; margin: 0 0 6px; font-size: 13px; color: rgba(43,43,43,0.7); }
.rm-legend span { display: inline-flex; align-items: center; gap: 7px; }
.rm-legend i { width: 15px; height: 15px; border-radius: 3px; border: 1.5px solid #2b2b2b; background: #e5d0ff; font-style: normal; }
.rm-legend i.completed { background: #b7e1a1; }
.rm-legend i.in-progress { background: #a9d3f0; }
.rm-legend i.pending { background: #ececec; border-style: dashed; }
.rm-legend i.ref { background: #fff; }
.rm-legend i.case { background: #ffd9e8; }

/* Roadmap detail panel */
.rm-overlay { display: none; position: fixed; inset: 0; background: rgba(15,15,15,0.28); z-index: 70; }
.rm-overlay.show { display: block; }
.rm-panel { position: fixed; top: 0; right: 0; bottom: 0; width: 400px; max-width: 88vw; background: #fff; border-left: 1px solid var(--c-line); box-shadow: -4px 0 20px rgba(15,15,15,0.1); z-index: 80; transform: translateX(100%); transition: transform 0.22s ease; display: flex; flex-direction: column; }
.rm-panel.open { transform: translateX(0); }
.rm-panel-head { padding: 22px 24px 14px; border-bottom: 1px solid var(--c-line); }
.rm-panel-head h3 { font-size: 20px; font-weight: 700; line-height: 1.4; color: var(--c-ink); }
.rm-panel-meta { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.rm-tag { font-size: 11px; padding: 3px 8px; border-radius: 3px; background: var(--c-line); color: var(--c-ink-soft); }
.rm-tag.completed { background: #dbeddb; color: var(--c-accent); }
.rm-tag.in-progress { background: #d3e5ef; color: #2e6b8a; }
.rm-panel-body { flex: 1; overflow-y: auto; padding: 20px 24px; font-size: 14px; line-height: 1.85; color: var(--c-ink-soft); }
.rm-panel-foot { padding: 14px 24px 20px; border-top: 1px solid var(--c-line); display: flex; gap: 10px; }
.rm-panel-close { position: absolute; top: 16px; right: 16px; width: 28px; height: 28px; border: none; background: transparent; font-size: 18px; color: var(--c-ink-faint); cursor: pointer; border-radius: 6px; }
.rm-panel-close:hover { background: var(--c-line); }

/* Responsive */
@media (max-width: 768px) {
  .content-body.roadmap-mode { max-width: 100%; }
  .rm-row { grid-template-columns: 1fr; gap: 10px; justify-items: center; }
  .rm-side.left, .rm-side.right { align-items: center; }
  .rm-rows { gap: 28px; }
  .rm-svg { display: none; }
  .rm-node.trunk { width: 100%; max-width: 320px; }
  .content-header { padding: var(--sp-12) 20px 8px; }
  .content-header h2 { font-size: 26px; }
  .content-body { padding: 20px 20px 120px; font-size: 15px; line-height: 1.75; }
  .content-body h2 { font-size: 20px; margin: 48px 0 16px; }
  .content-body h3 { font-size: 17px; margin: 36px 0 12px; }
  .content-body p { margin: 0 0 20px; }
  .content-body img, .content-body video { margin: 28px auto; }
  /* wide tables scroll horizontally instead of squishing */
  .content-body .table-wrap table { width: auto; min-width: 100%; }
  .content-body .table-wrap th, .content-body .table-wrap td { white-space: nowrap; }
  .action-bar { left: 0; padding: 12px 20px; }
}

@media (max-width: 480px) {
  .content-header { padding: 60px 16px 8px; }
  .content-header h2 { font-size: 22px; line-height: 1.35; }
  .content-body { padding: 16px 16px 110px; }
  .content-body h2 { font-size: 19px; margin: 40px 0 14px; }
  .content-body h3 { font-size: 16px; margin: 30px 0 10px; }
  .content-body ul, .content-body ol { padding-left: 22px; }
  .content-body pre { padding: 14px 16px; }
  .summary-box { padding: 16px 18px; }
  .action-bar { padding: 10px 16px; gap: 8px; }
  .action-status { font-size: 12px; }
  .btn { padding: 6px 12px; font-size: 13px; }
}

/* ===== 記事ページ ===== */
.content-header h2 { font-family: var(--font-serif); letter-spacing: var(--ls-heading); }
.content-body { line-height: var(--lh-body); }
.content-body h2, .content-body h3, .content-body h4 { font-family: var(--font-serif); letter-spacing: var(--ls-heading); }

/* 理論/実践の切替ピル */
.section-pills { display: flex; gap: var(--sp-2); margin-top: var(--sp-3); }
.section-pill { display: inline-flex; align-items: center; gap: 4px; padding: 5px 14px; font-size: var(--fs-sm); font-weight: 500; color: var(--c-ink-soft); text-decoration: none; border: 1px solid var(--c-line-strong); border-radius: 999px; }
.section-pill:hover { border-color: var(--c-accent); color: var(--c-accent); }
.section-pill.active { background: var(--c-accent); border-color: var(--c-accent); color: #fff; font-weight: 700; }

/* 目次 */
.toc { margin: var(--sp-6) 0 var(--sp-8); border: 1px solid var(--c-line); border-left: 3px solid var(--c-accent); border-radius: var(--radius-sm); background: var(--c-paper-alt); padding: var(--sp-4) var(--sp-5); }
.toc summary { font-family: var(--font-serif); font-size: var(--fs-sm); font-weight: 700; letter-spacing: var(--ls-heading); color: var(--c-ink); cursor: pointer; user-select: none; list-style: none; }
.toc summary::before { content: '▸ '; color: var(--c-accent); }
.toc[open] summary::before { content: '▾ '; }
.toc summary::-webkit-details-marker { display: none; }
.toc-list { display: flex; flex-direction: column; gap: 2px; margin-top: var(--sp-3); }
.toc-item { font-size: var(--fs-sm); color: var(--c-ink-soft); text-decoration: none; line-height: 1.9; }
.toc-item:hover { color: var(--c-accent); text-decoration: underline; }
.toc-h3 { padding-left: var(--sp-4); font-size: var(--fs-xs); }

/* 記事末尾: 次に読む・関連記事 */
.article-footer { margin-top: var(--sp-16); padding-top: var(--sp-8); border-top: 1px solid var(--c-line); }
.af-label { font-family: var(--font-serif); font-size: var(--fs-lg); font-weight: 600; letter-spacing: var(--ls-heading); color: var(--c-ink); margin: var(--sp-8) 0 var(--sp-4); }
.af-label:first-child { margin-top: 0; }
.next-read-card { display: flex; align-items: center; gap: var(--sp-4); padding: var(--sp-5) var(--sp-6); border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-paper); text-decoration: none; color: inherit; box-shadow: var(--shadow-card); transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease; }
.next-read-card:hover { transform: translateY(-2px); border-color: var(--c-line-strong); box-shadow: var(--shadow-card-hover); }
.next-read-icon { font-size: 28px; flex-shrink: 0; }
.next-read-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.next-read-title { font-family: var(--font-serif); font-size: var(--fs-lg); font-weight: 600; line-height: var(--lh-tight); color: var(--c-ink); }
.next-read-summary { font-size: var(--fs-sm); color: var(--c-ink-soft); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.next-read-arrow { margin-left: auto; flex-shrink: 0; font-size: var(--fs-lg); color: var(--c-accent); }
.related-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

/* 記事本文のリンク下線は、記事末尾のカード類には継承させない */
.content-body .article-footer a { text-decoration: none; }
.content-body .article-footer .card-title, .content-body .article-footer .next-read-title { text-decoration: none; }

/* ===== 学習記事の左サイドバー（章一覧＋現在章の見出し） ===== */
.article-nav {
  width: 264px; min-width: 264px; flex-shrink: 0;
  overflow-y: auto; border-right: 1px solid var(--c-line);
  background: var(--c-paper-alt);
  padding: var(--sp-8) var(--sp-4) var(--sp-16);
}
.anav-title { font-family: var(--font-serif); font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.12em; color: var(--c-ink-faint); padding: 0 var(--sp-3); margin-bottom: var(--sp-4); }
.anav-chapter { margin-bottom: 2px; }
.anav-ch-title {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--radius-sm);
  font-size: var(--fs-sm); line-height: 1.6; color: var(--c-ink-soft); text-decoration: none;
}
.anav-ch-title:hover { background: rgba(33,39,43,0.04); color: var(--c-ink); }
.anav-chapter.current > .anav-ch-title { background: var(--c-accent-soft); color: var(--c-accent); font-weight: 700; }
.anav-ico { flex-shrink: 0; }
.anav-mark { margin-left: auto; flex-shrink: 0; font-size: var(--fs-xs); }
.anav-mark.completed { color: var(--c-accent); }
.anav-mark.in-progress { color: var(--c-ink-faint); }
.anav-sections { display: flex; flex-direction: column; margin: var(--sp-1) 0 var(--sp-2) var(--sp-5); }
.anav-sec { padding: 3px var(--sp-3); border-radius: var(--radius-sm); font-size: var(--fs-xs); color: var(--c-ink-soft); text-decoration: none; }
.anav-sec:hover { background: rgba(33,39,43,0.04); color: var(--c-ink); }
.anav-sec.active { color: var(--c-accent); font-weight: 700; }
.anav-heads { display: flex; flex-direction: column; margin: 0 0 var(--sp-4) var(--sp-5); padding-left: var(--sp-3); border-left: 1px solid var(--c-line); }
.anav-head { padding: 3px var(--sp-2); font-size: var(--fs-xs); line-height: 1.7; color: var(--c-ink-faint); text-decoration: none; }
.anav-head:hover { color: var(--c-accent); }

/* サイドバー表示中はアクションバーを本文側だけに敷く */
body.has-article-nav .action-bar { left: 264px; }

@media (max-width: 900px) {
  .article-nav { display: none; }
  body.has-article-nav .action-bar { left: 0; }
}

/* サイドバー見出しはリンク（学習記事一覧へ戻る） */
a.anav-title { display: block; text-decoration: none; }
a.anav-title:hover { color: var(--c-accent); }