/* ==========================================================================
   youtown.jp 部品ライブラリ（/parts, /industries, /guides, /cases の移設ページ）
   - 既存の .pt-* トークン（深緑 #173f3c / 紙色 #f7f7f2 / 銅 #a84b28）に合わせる
   - クラスは .lib- 接頭辞。既存ページには影響しない
   ========================================================================== */
.lib-page {
  --lib-ink: #173d3b;
  --lib-deep: #173f3c;
  --lib-deep-2: #28594e;
  --lib-mint: #edf1e9;
  --lib-mint-2: #e1ebe3;
  --lib-paper: #f7f7f2;
  --lib-line: #d6ded6;
  --lib-line-strong: #b9c9bf;
  --lib-muted: #526764;
  --lib-accent: #a84b28;
  --lib-accent-deep: #843a20;
  --lib-accent-tint: #f6ebe4;
  --lib-radius: 14px;
  --lib-radius-sm: 10px;
  --lib-shadow: 0 2px 10px rgba(23, 61, 59, .06);
  --lib-shadow-hover: 0 10px 28px rgba(23, 61, 59, .12);
  --lib-ease: cubic-bezier(.16, 1, .3, 1);
}

/* ------------------------------------------------------------- hero */
.lib-hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 56px;
  color: #fff;
  background:
    radial-gradient(ellipse at 88% 18%, rgba(225, 235, 227, .18), transparent 46%),
    linear-gradient(120deg, #173f3c, #28594e);
}
.lib-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% auto;
  width: 46vw;
  max-width: 560px;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .10);
  box-shadow: inset 0 0 0 40px rgba(255, 255, 255, .03);
  pointer-events: none;
}
.lib-hero-inner {
  position: relative;
  max-width: 860px;
}
.lib-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .9rem;
  color: #dbe8df;
  font-family: var(--pt-font-en, "Space Grotesk", sans-serif);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .08em;
}
.lib-kicker-sep { opacity: .5; }
.lib-kicker-dark { color: #476860; }
.lib-title {
  margin: 0 0 1rem;
  font-size: clamp(27px, 3.5vw, 42px);
  line-height: 1.45;
  letter-spacing: -.02em;
  font-weight: 800;
}
.lib-lead {
  max-width: 720px;
  margin: 0;
  color: #dfebe3;
  font-size: 15.5px;
  line-height: 1.9;
}
.lib-lead-sub { margin-top: .6rem; color: #c9dacf; font-size: 14px; }
.lib-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
}
.lib-tags li {
  padding: .3rem .7rem;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: #eef4ef;
  font-size: 12.5px;
  font-weight: 700;
}
.lib-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.5rem;
}
.lib-btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .55);
  background: transparent;
}
.lib-btn-ghost:hover,
.lib-btn-ghost:focus-visible {
  color: var(--lib-deep);
  background: #fff;
  border-color: #fff;
}
.lib-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem 1.2rem;
  margin: 1.4rem 0 0;
  color: #c9dacf;
  font-size: 12.5px;
}
.lib-meta a { color: #fff; }
.lib-hero-count { margin: 1.2rem 0 0; color: #c9dacf; font-size: 13px; }

/* ------------------------------------------------------------- layout */
.lib-body { padding: 48px 0 24px; }
.lib-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}
.lib-main { min-width: 0; }
.lib-side-sticky { position: sticky; top: 92px; display: grid; gap: 16px; }

/* ------------------------------------------------------------- blocks */
.lib-block {
  margin: 0 0 20px;
  padding: clamp(20px, 3vw, 32px);
  background: #fff;
  border: 1px solid var(--lib-line);
  border-radius: var(--lib-radius);
  box-shadow: var(--lib-shadow);
  scroll-margin-top: 100px;
}
.lib-h2 {
  margin: 0 0 .6rem;
  color: var(--lib-ink);
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.5;
  font-weight: 800;
  letter-spacing: -.01em;
}
.lib-block-lead {
  margin: 0 0 1.1rem;
  color: var(--lib-muted);
  font-size: 14.5px;
  line-height: 1.85;
}
.lib-block-note {
  margin: 1rem 0 0;
  padding: .8rem 1rem;
  background: var(--lib-mint);
  border-radius: var(--lib-radius-sm);
  font-size: 13.5px;
  line-height: 1.8;
}
.lib-p { margin: 0 0 .9rem; line-height: 1.95; }
.lib-p:last-child { margin-bottom: 0; }
.lib-notice {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
  margin: 0 0 20px;
  padding: .9rem 1.1rem;
  background: var(--lib-mint);
  border: 1px solid #c3d3c7;
  border-radius: var(--lib-radius-sm);
  color: var(--lib-ink);
  font-size: 13.5px;
  line-height: 1.75;
}
.lib-notice .bi { margin-top: .15rem; color: var(--lib-deep-2); }
.lib-inline-link {
  color: var(--lib-accent-deep);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.lib-inline-link:hover { color: var(--lib-accent); }

/* divider（統合した元ページの見出し） */
.lib-divider {
  margin: 36px 0 18px;
  padding: 0 0 12px 18px;
  border-left: 4px solid var(--lib-accent);
  scroll-margin-top: 100px;
}
.lib-divider-title {
  margin: 0;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.45;
  font-weight: 800;
  color: var(--lib-ink);
}
.lib-divider-lead { margin: .5rem 0 0; color: var(--lib-muted); font-size: 14px; line-height: 1.8; }

/* lists */
.lib-list { margin: 0; padding: 0; list-style: none; display: grid; gap: .55rem; }
.lib-list li { position: relative; padding-left: 1.7rem; line-height: 1.8; }
.lib-list-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55rem;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--lib-mint-2) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='%2328594e' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round' d='M3.5 8.5l3 3 6-6.5'/></svg>") center/62% no-repeat;
}
.lib-list-dot li { padding-left: 1.1rem; }
.lib-list-dot li::before {
  content: "";
  position: absolute;
  left: .1rem;
  top: .78rem;
  width: .4rem;
  height: .4rem;
  border-radius: 50%;
  background: var(--lib-accent);
}
.lib-list-num { counter-reset: libnum; }
.lib-list-num li { padding-left: 2.1rem; }
.lib-list-num li::before {
  counter-increment: libnum;
  content: counter(libnum);
  position: absolute;
  left: 0;
  top: .3rem;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--lib-deep);
  color: #fff;
  font-family: var(--pt-font-en, sans-serif);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}

/* checklist（対話式） */
.lib-check { border-color: #c3d3c7; background: linear-gradient(180deg, #fff, #f8faf7); }
.lib-check-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; }
.lib-check-count {
  flex-shrink: 0;
  padding: .35rem .8rem;
  border-radius: 999px;
  background: var(--lib-mint);
  color: var(--lib-deep-2);
  font-family: var(--pt-font-en, sans-serif);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.lib-check.is-complete .lib-check-count { background: var(--lib-deep); color: #fff; }
.lib-check-list { margin: .4rem 0 0; padding: 0; list-style: none; display: grid; gap: .35rem; }
.lib-check-list label {
  display: grid;
  grid-template-columns: 1.4rem minmax(0, 1fr);
  gap: .7rem;
  align-items: start;
  padding: .55rem .6rem;
  border-radius: var(--lib-radius-sm);
  cursor: pointer;
  transition: background .15s;
}
.lib-check-list label:hover { background: var(--lib-mint); }
.lib-check-input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.lib-check-box {
  width: 1.4rem;
  height: 1.4rem;
  margin-top: .15rem;
  border: 2px solid var(--lib-line-strong);
  border-radius: 6px;
  background: #fff;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 13px;
  transition: background .15s, border-color .15s;
}
.lib-check-input:checked + .lib-check-box { background: var(--lib-deep); border-color: var(--lib-deep); }
.lib-check-input:focus-visible + .lib-check-box { outline: 3px solid var(--lib-accent); outline-offset: 3px; }
.lib-check-text { line-height: 1.75; }
.lib-check-input:checked ~ .lib-check-text { color: var(--lib-muted); }
.lib-check-note { margin: 1rem 0 0; color: var(--lib-muted); font-size: 12.5px; line-height: 1.7; }

/* cards */
.lib-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.lib-cards-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.lib-cards-3 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.lib-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 18px 20px;
  background: var(--lib-paper);
  border: 1px solid var(--lib-line);
  border-radius: var(--lib-radius-sm);
  color: var(--lib-ink);
  min-width: 0;
}
.lib-card p { margin: 0; color: #2f4541; font-size: 14px; line-height: 1.8; }
.lib-card-title { margin: 0; font-size: 15.5px; line-height: 1.55; font-weight: 800; }
.lib-card-link { text-decoration: none; transition: transform .2s var(--lib-ease), box-shadow .2s, border-color .2s; }
.lib-card-link:hover, .lib-card-link:focus-visible { transform: translateY(-3px); border-color: var(--lib-accent); box-shadow: var(--lib-shadow-hover); color: var(--lib-ink); }
.lib-card-more { margin-top: auto; padding-top: .3rem; color: var(--lib-accent-deep); font-size: 13px; font-weight: 700; }
.lib-card-pairs { margin: .2rem 0 0; display: grid; gap: .35rem; }
.lib-card-pairs div { display: grid; grid-template-columns: 6.5em minmax(0, 1fr); gap: .5rem; font-size: 13px; line-height: 1.7; }
.lib-card-pairs dt { color: var(--lib-deep-2); font-weight: 700; }
.lib-card-pairs dd { margin: 0; }

/* steps */
.lib-steps { margin: .4rem 0 0; padding: 0; list-style: none; display: grid; gap: 0; }
.lib-step { position: relative; display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 1rem; padding: 0 0 1.4rem; }
.lib-step::before {
  content: "";
  position: absolute;
  left: 1.45rem;
  top: 2.6rem;
  bottom: 0;
  width: 2px;
  background: var(--lib-mint-2);
}
.lib-step:last-child { padding-bottom: 0; }
.lib-step:last-child::before { display: none; }
.lib-step-no {
  width: 2.9rem;
  height: 2.9rem;
  border-radius: 50%;
  background: var(--lib-deep);
  color: #fff;
  font-family: var(--pt-font-en, sans-serif);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  display: grid;
  place-items: center;
  box-shadow: 0 0 0 5px #fff;
}
.lib-step-body { padding-top: .45rem; }
.lib-step-title { margin: 0 0 .3rem; font-size: 16px; font-weight: 800; line-height: 1.5; }
.lib-step-body p { margin: 0; line-height: 1.8; font-size: 14.5px; }
.lib-step-extra { color: var(--lib-muted); font-size: 13.5px !important; margin-top: .25rem !important; }

/* table（項目：説明） */
.lib-table-wrap { overflow-x: auto; border: 1px solid var(--lib-line); border-radius: var(--lib-radius-sm); }
.lib-table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.8; }
.lib-table th, .lib-table td { padding: .85rem 1rem; vertical-align: top; border-bottom: 1px solid var(--lib-line); text-align: left; }
.lib-table tr:last-child th, .lib-table tr:last-child td { border-bottom: 0; }
.lib-table th { width: 27%; background: var(--lib-mint); color: var(--lib-deep); font-weight: 700; }

/* pairs（相談例の要約） */
.lib-summary { background: linear-gradient(160deg, #fff, #f5f8f3); }
.lib-pairs { margin: 0; display: grid; gap: 0; }
.lib-pair { display: grid; grid-template-columns: 10em minmax(0, 1fr); gap: 1rem; padding: .8rem 0; border-top: 1px dashed var(--lib-line-strong); }
.lib-pair:first-child { border-top: 0; }
.lib-pair dt { color: var(--lib-deep-2); font-weight: 800; font-size: 14px; line-height: 1.7; }
.lib-pair dd { margin: 0; line-height: 1.8; font-size: 14.5px; }

/* faq */
.lib-faq-item { border-top: 1px solid var(--lib-line); }
.lib-faq-item:last-of-type { border-bottom: 1px solid var(--lib-line); }
.lib-faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem .2rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  line-height: 1.7;
}
.lib-faq-item summary::-webkit-details-marker { display: none; }
.lib-faq-item summary .bi { flex-shrink: 0; color: var(--lib-deep-2); transition: transform .2s; }
.lib-faq-item[open] summary .bi { transform: rotate(45deg); }
.lib-faq-a { padding: 0 .2rem 1.1rem; }
.lib-faq-a p { margin: 0; color: #2f4541; line-height: 1.85; }

/* inline CTA */
.lib-inline-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: center;
  margin-top: 28px;
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--lib-radius);
  background: var(--lib-mint);
  border: 1px solid #c3d3c7;
}
.lib-inline-cta p { margin: 0; line-height: 1.8; font-size: 14.5px; }
.lib-inline-cta .lib-h2 { margin: .2rem 0 .5rem; font-size: 19px; }

/* sidebar */
.lib-side-label {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin: 0 0 .6rem;
  color: var(--lib-deep-2);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .06em;
}
.lib-toc { padding: 18px 20px; background: #fff; border: 1px solid var(--lib-line); border-radius: var(--lib-radius); box-shadow: var(--lib-shadow); }
.lib-toc ol { margin: 0; padding: 0; list-style: none; display: grid; gap: .15rem; }
.lib-toc a {
  display: block;
  padding: .4rem .6rem .4rem .9rem;
  border-left: 2px solid transparent;
  color: var(--lib-ink);
  font-size: 13.5px;
  line-height: 1.55;
  text-decoration: none;
  border-radius: 0 6px 6px 0;
}
.lib-toc a:hover { background: var(--lib-mint); }
.lib-toc a.is-current { border-left-color: var(--lib-accent); background: var(--lib-mint); font-weight: 700; }
.lib-toc-divider a { margin-top: .4rem; color: var(--lib-accent-deep); font-weight: 800; }
.lib-side-cta { padding: 20px; background: var(--lib-deep); border-radius: var(--lib-radius); color: #fff; }
.lib-side-cta .lib-side-label { color: #dbe8df; }
.lib-side-text { margin: 0 0 .9rem; color: #dfebe3; font-size: 13.5px; line-height: 1.7; }
.lib-side-links { margin: 1rem 0 0; padding: 0; list-style: none; display: grid; gap: .3rem; }
.lib-side-links a { color: #dfebe3; font-size: 13.5px; text-decoration: none; }
.lib-side-links a::before { content: "→ "; color: #a9c4b5; }
.lib-side-links a:hover { color: #fff; text-decoration: underline; }

/* related */
.lib-related { padding: 24px 0 64px; }
.lib-related-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 1rem; margin-bottom: 18px; }
.lib-related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.lib-related-card {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 18px 20px;
  background: #fff;
  border: 1px solid var(--lib-line);
  border-radius: var(--lib-radius-sm);
  color: var(--lib-ink);
  text-decoration: none;
  box-shadow: var(--lib-shadow);
  transition: transform .2s var(--lib-ease), box-shadow .2s, border-color .2s;
}
.lib-related-card:hover, .lib-related-card:focus-visible { transform: translateY(-3px); border-color: var(--lib-accent); box-shadow: var(--lib-shadow-hover); color: var(--lib-ink); }
.lib-related-kind { color: var(--lib-deep-2); font-size: 12px; font-weight: 800; letter-spacing: .04em; }
.lib-related-card strong { font-size: 15px; line-height: 1.55; }
.lib-related-note { color: var(--lib-muted); font-size: 13px; line-height: 1.65; }

/* ------------------------------------------------------------- hub（一覧） */
.lib-hub-body { padding: 40px 0 72px; }
.lib-filter { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 28px; }
.lib-chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  min-height: 40px;
  padding: .4rem .95rem;
  border: 1px solid var(--lib-line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--lib-ink);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.lib-chip span { color: var(--lib-muted); font-family: var(--pt-font-en, sans-serif); font-size: 12px; }
.lib-chip:hover { border-color: var(--lib-deep-2); background: var(--lib-mint); }
.lib-chip.is-active { background: var(--lib-deep); border-color: var(--lib-deep); color: #fff; }
.lib-chip.is-active span { color: #c9dacf; }
.lib-group { margin-bottom: 40px; }
.lib-group[hidden] { display: none; }
.lib-group-title { display: flex; align-items: baseline; gap: .7rem; margin: 0 0 16px; font-size: 21px; font-weight: 800; color: var(--lib-ink); }
.lib-group-count { color: var(--lib-muted); font-size: 13px; font-weight: 600; }
.lib-hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.lib-hub-card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  min-height: 100%;
  padding: 22px 22px 18px;
  background: #fff;
  border: 1px solid var(--lib-line);
  border-radius: var(--lib-radius);
  color: var(--lib-ink);
  text-decoration: none;
  box-shadow: var(--lib-shadow);
  transition: transform .2s var(--lib-ease), box-shadow .2s, border-color .2s;
}
.lib-hub-card:hover, .lib-hub-card:focus-visible { transform: translateY(-4px); border-color: var(--lib-accent); box-shadow: var(--lib-shadow-hover); color: var(--lib-ink); }
.lib-hub-cat { color: var(--lib-deep-2); font-size: 12px; font-weight: 800; letter-spacing: .04em; }
.lib-hub-title { font-size: 16px; line-height: 1.55; font-weight: 800; }
.lib-hub-lead { color: var(--lib-muted); font-size: 13.5px; line-height: 1.7; }
.lib-hub-foot { margin: 8px 0 0; color: var(--lib-muted); font-size: 14px; }
.lib-hub-foot a { color: var(--lib-accent-deep); font-weight: 700; }

/* ------------------------------------------------------------- responsive */
@media (max-width: 991.98px) {
  .lib-layout { grid-template-columns: 1fr; gap: 24px; }
  .lib-side { order: -1; }
  .lib-side-sticky { position: static; }
  .lib-toc { display: none; } /* モバイルは本文を先に。目次は省略 */
  .lib-side-cta { display: none; } /* 追従CTA（pt-sticky-cta）があるため重複させない */
}
@media (max-width: 680px) {
  .lib-hero { padding: 40px 0 36px; }
  .lib-title { font-size: clamp(24px, 6.6vw, 30px); }
  .lib-lead { font-size: 14.5px; }
  .lib-body { padding: 28px 0 8px; }
  .lib-block { padding: 18px; border-radius: 12px; }
  .lib-inline-cta { grid-template-columns: 1fr; }
  .lib-inline-cta .pt-btn { width: 100%; justify-content: center; }
  .lib-pair { grid-template-columns: 1fr; gap: .2rem; }
  .lib-table th { width: 32%; }
  .lib-table th, .lib-table td { padding: .7rem .6rem; font-size: 13.5px; overflow-wrap: anywhere; }
  .lib-step { grid-template-columns: 2.4rem minmax(0, 1fr); gap: .75rem; }
  .lib-step-no { width: 2.4rem; height: 2.4rem; font-size: 12px; }
  .lib-step::before { left: 1.2rem; }
  .lib-hero-actions .pt-btn { width: 100%; justify-content: center; }
  .lib-hub-grid { grid-template-columns: 1fr; }
  .lib-card-pairs div { grid-template-columns: 1fr; gap: .1rem; }
}
@media (prefers-reduced-motion: reduce) {
  .lib-card-link, .lib-related-card, .lib-hub-card, .lib-faq-item summary .bi { transition: none; }
}