/* ============================================================
   Hub pages (bus stop shelters, metal furniture, light boxes,
   street furniture, stainless steel) — static product/sourcing
   hubs skinned in the site's heritage design system.
   Builds on styles.css tokens; no standalone palette.
   ============================================================ */

/* ----- Hero ----- */
.hub-hero { padding: 148px 0 56px; }
@media (max-width: 920px) { .hub-hero { padding: 40px 0 48px; } }
.hub-hero .display-xl { max-width: 22ch; margin: 18px 0 20px; }
.hub-hero .lede { max-width: 62ch; }

.hub-pills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hub-pills span {
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 7px 14px;
}
body[data-lang="cn"] .hub-pills span { font-family: var(--font-body); font-size: 13px; letter-spacing: 0.12em; }

.hub-cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }

/* ----- Mobile quick nav (desktop nav-links hide ≤920px) ----- */
.hub-quicknav { display: none; }
@media (max-width: 920px) {
  .hub-quicknav {
    display: flex; gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-top: 72px; /* clear the fixed site header */
    padding: 12px var(--container-pad);
    border-bottom: 1px solid var(--line);
    background: var(--bg);
  }
  .hub-quicknav::-webkit-scrollbar { display: none; }
  .hub-quicknav a {
    flex: 0 0 auto;
    font-size: 13px; color: var(--ink-soft);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 7px 14px;
    white-space: nowrap;
  }
  .hub-quicknav a[aria-current="page"] { color: var(--ink); border-color: var(--accent); }
}

/* ----- Layout: content + rail ----- */
.hub-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 72px;
  padding: 24px 0 96px;
}
@media (max-width: 1080px) {
  .hub-layout { grid-template-columns: minmax(0, 1fr); gap: 48px; }
}

/* ----- Article prose ----- */
.hub-article { max-width: 70ch; }
/* styles.css pads every bare <section> 96px for the SPA; hub prose sections are compact */
.hub-article section { padding: 0; margin-bottom: 56px; }
.hub-article h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.18; letter-spacing: -0.005em; font-weight: 500;
  margin: 0 0 16px;
  scroll-margin-top: 96px;
}
.hub-article p { color: var(--ink-soft); margin: 0 0 16px; }
.hub-article a { color: var(--accent); }
.hub-article a:hover { color: var(--ink); }

/* Definition-style bullet rows */
.answer-list { list-style: none; margin: 20px 0 0; padding: 0; }
.answer-list li {
  display: grid; gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.answer-list li:last-child { border-bottom: 1px solid var(--line); }
.answer-list li strong { color: var(--ink); font-weight: 600; }
.answer-list li span { color: var(--ink-soft); }

/* ----- Signature: engineering spec sheet ----- */
.table-scroll { overflow-x: auto; margin: 24px 0 8px; }
table.spec-table {
  width: 100%;
  border-collapse: collapse;
  border-top: 2px solid var(--warm);
  font-size: 15px;
}
table.spec-table thead th {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  font-weight: 500;
  color: var(--ink-mute);
  text-align: left;
  padding: 12px 18px 10px 0;
  border-bottom: 1px solid var(--line-strong);
}
body[data-lang="cn"] table.spec-table thead th { font-family: var(--font-body); font-size: 12px; letter-spacing: 0.2em; }
table.spec-table tbody th,
table.spec-table tbody td {
  vertical-align: top;
  text-align: left;
  padding: 14px 18px 14px 0;
  border-bottom: 1px solid var(--line);
}
table.spec-table tbody th {
  font-weight: 600; color: var(--ink);
  width: 34%; min-width: 180px;
}
table.spec-table tbody td { color: var(--ink-soft); }

/* ----- FAQ ----- */
.hub-faq details { border-top: 1px solid var(--line); }
.hub-faq details:last-child { border-bottom: 1px solid var(--line); }
.hub-faq summary {
  list-style: none;
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  cursor: pointer;
  padding: 18px 0;
  color: var(--ink); font-weight: 500;
}
.hub-faq summary::-webkit-details-marker { display: none; }
.hub-faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--warm);
  flex: 0 0 auto;
  transition: transform var(--tr-fast);
}
.hub-faq details[open] summary::after { content: "−"; }
.hub-faq details p { margin: 0 0 20px; color: var(--ink-soft); max-width: 64ch; }

/* ----- Side rail ----- */
.hub-side { position: sticky; top: 96px; align-self: start; display: grid; gap: 20px; }
@media (max-width: 1080px) { .hub-side { position: static; } }
.side-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px;
  display: grid; gap: 2px;
}
.side-card b {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  font-weight: 500; color: var(--ink-mute);
  margin-bottom: 10px;
}
body[data-lang="cn"] .side-card b { font-family: var(--font-body); font-size: 12px; letter-spacing: 0.2em; }
.side-card a {
  color: var(--ink-soft);
  padding: 7px 0;
  border-top: 1px solid var(--line);
  transition: color var(--tr-fast);
}
.side-card a:first-of-type { border-top: 0; }
.side-card a:hover { color: var(--accent); }
.side-card p { margin: 0 0 12px; color: var(--ink-soft); font-size: 14px; line-height: 1.55; }

/* ----- Closing CTA band ----- */
.hub-cta {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 44px 40px;
  margin: 8px 0 96px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px;
}
.hub-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 500; line-height: 1.2; margin: 0 0 8px;
  scroll-margin-top: 96px;
}
.hub-cta p { margin: 0; color: var(--ink-soft); max-width: 52ch; }
@media (max-width: 640px) { .hub-cta { padding: 32px 24px; } }

/* styles.css pads every bare <section>; the hero defines its own rhythm */
section.hub-hero { padding: 148px 0 56px; }
@media (max-width: 920px) { section.hub-hero { padding: 40px 0 48px; } }

/* ----- Quality floor ----- */
a:focus-visible, summary:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
@media (prefers-reduced-motion: reduce) {
  .hub-faq summary::after, .side-card a { transition: none; }
}