/*
 * HVAC Control Boards wing — layered on top of /assets/site.css (load that
 * first). Adds: hero lookup-preview visual, brand nav cards, model index
 * groupings, the replacement list + board-meta block used on every model
 * and brand page, source-link list, affiliate part-pick boxes, and
 * related-page footer nav. Zero dependencies, zero external requests.
 */

/* ---- hub-page hero visual: OEM board -> replacement board preview ---- */
.lookup-preview { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 12px; padding: 20px; }
.lookup-row { align-items: center; border-top: 1px solid var(--color-border-soft); display: flex; font-size: .86rem; gap: 8px; padding: 11px 0; }
.lookup-row:first-child { border-top: 0; }
.lookup-oem { color: var(--color-text); font-family: var(--font-serif-lining); font-weight: 700; }
.lookup-arrow { color: var(--color-text-soft); flex-shrink: 0; }
.lookup-new { color: var(--color-green-dark); font-family: var(--font-serif-lining); font-weight: 700; }
.lookup-preview-caption { color: var(--color-text-soft); font-size: .78rem; margin: 14px 2px 0; }

/* ---- brand navigation cards (wing home) ---- */
.brand-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 24px 0 8px; }
.brand-card { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 11px; color: var(--color-text); display: block; padding: 20px; text-decoration: none; }
.brand-card:hover { border-color: var(--color-accent); }
.brand-card h3 { color: var(--color-green-dark); font-family: var(--font-serif); font-size: 1.25rem; margin: 0 0 6px; }
.brand-card p { color: var(--color-text-soft); font-size: .84rem; line-height: 1.5; margin: 0; }

/* ---- board replacement list (model + brand pages) ---- */
.replacement-list { list-style: none; margin: 20px 0; padding: 0; }
.replacement-item { align-items: center; background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 10px; display: flex; flex-wrap: wrap; gap: 10px 16px; justify-content: space-between; margin-bottom: 12px; padding: 16px 18px; }
.replacement-item-info strong { color: var(--color-green-dark); font-family: var(--font-serif-lining); font-size: 1.05rem; }
.replacement-item-info .source-note { color: var(--color-text-soft); display: block; font-size: .78rem; margin-top: 3px; }

.board-meta { color: var(--color-text-muted); line-height: 1.6; margin: 18px 0; }
.board-meta strong { color: var(--color-green-dark); }

/* ---- brand-page / model-index board table ---- */
.board-index-group { margin-top: 40px; }
.board-index-group h2 { font-size: 1.6rem; }
.board-link-grid { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); margin-top: 14px; }
.board-link-grid a { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 7px; font-family: var(--font-serif-lining); font-size: .92rem; font-weight: 700; padding: 9px 12px; text-decoration: none; }
.board-link-grid a:hover { border-color: var(--color-accent); }

.brand-board-row { border-top: 1px solid var(--color-border-soft); padding: 14px 0; }
.brand-board-row:first-child { border-top: 0; }
.brand-board-row .oem-part { color: var(--color-green-dark); font-family: var(--font-serif-lining); font-size: 1.05rem; font-weight: 700; }
.brand-board-row p { color: var(--color-text-muted); line-height: 1.55; margin: 4px 0 0; }

/* ---- affiliate part-pick placeholder ---- */
/* Affiliate placeholder — no real link exists until the Amazon Associates
   tag is wired up (see docs/design.md "联盟合规"). A <span>, not an <a>: no
   href, not focusable, not clickable, and it says so ("Link coming soon").
   Injection convention, when the Amazon tag is ready: swap the <span
   class="aff-placeholder" data-aff="..." data-product="..." aria-disabled>
   for `<a data-aff="..." data-product="..." href="{real amazon URL with
   tag}" rel="sponsored noopener">`, keep the visible label. */
.aff-placeholder { background: var(--color-green-dark); border-radius: 6px; color: #fff; cursor: not-allowed; display: inline-block; font-size: .78rem; font-weight: 800; min-height: 18px; opacity: .7; padding: 9px 12px; white-space: nowrap; }

/* ---- sources section ---- */
.sources { border-top: 1px solid var(--color-border-soft); margin-top: 40px; padding-top: 32px; }
.source-links { display: grid; gap: 10px; margin-top: 16px; }
.source-links a { align-items: center; background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 9px; color: var(--color-text); display: flex; flex-wrap: wrap; font-weight: 700; gap: 4px 10px; padding: 13px 16px; text-decoration: none; }
.source-links a::before { background: var(--color-green-dark); border-radius: 999px; color: #fff; content: "Source"; flex-shrink: 0; font-size: .64rem; font-weight: 800; letter-spacing: .07em; padding: 3px 9px; text-transform: uppercase; }
.source-links a:hover { border-color: var(--color-accent); }
.source-links a:hover span[aria-hidden] { color: var(--color-accent); }
.source-links a span[aria-hidden] { color: var(--color-green-mid); font-weight: 800; }
.source-links .source-note { color: var(--color-text-soft); flex-basis: 100%; font-size: .8rem; font-weight: 400; margin-top: 2px; }

/* ---- related-page interlink footer nav ---- */
.related-pages { border-top: 1px solid var(--color-border-soft); margin-top: 40px; padding-top: 32px; }
.related-pages h2 { font-size: 1.5rem; }
.related-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 16px; }
.related-grid a { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 9px; color: var(--color-green-dark); display: block; font-weight: 700; padding: 14px 16px; text-decoration: none; }
.related-grid a:hover { border-color: var(--color-accent); color: var(--color-accent); }
.related-grid a span { color: var(--color-text-soft); display: block; font-size: .8rem; font-weight: 400; margin-top: 3px; }

.model-page { max-width: 860px; }

@media (max-width: 480px) {
  .replacement-item { flex-direction: column; align-items: flex-start; }
}