:root[data-theme=dark]{--bhc-bg: #0f1115;--bhc-surface: #141820;--bhc-panel: #151b24;--bhc-border: #ffffff1a;--bhc-muted: #9ca3af;--bhc-soft: rgba(255,255,255,.04)}:root[data-theme=light]{--bhc-bg: #f6f8fb;--bhc-surface: #ffffff;--bhc-panel: #ffffff;--bhc-border: #00000014;--bhc-muted: #475569;--bhc-soft: rgba(15,23,42,.04)}.bhc-page{background:var(--bhc-bg)}.bhc-hero{border-bottom:1px solid var(--bhc-border);background:radial-gradient(900px 500px at 10% -10%,rgba(76,141,245,.18),transparent),radial-gradient(900px 500px at 90% -10%,rgba(57,181,213,.14),transparent),var(--bhc-bg)}.bhc-hero .container{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:18px;align-items:start}.bhc-hero-copy,.bhc-spec-panel,.bhc-stage,.bhc-side-panel,.bhc-card,.bhc-socket-stage,.bhc-plan-stage,.bhc-summary-hero,.bhc-number-field,.bhc-pill,.bhc-swatch-btn,.bhc-toggle,.bhc-rail-step{border:1px solid var(--bhc-border);background:color-mix(in srgb,var(--bhc-surface) 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.bhc-reference{margin-top:0}.bhc-reference-board-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:12px}.bhc-ref-card{border:1px solid var(--bhc-border);border-radius:16px;overflow:hidden;background:color-mix(in srgb,var(--bhc-surface) 92%,transparent)}.bhc-ref-card-head{padding:12px 14px;border-bottom:1px solid var(--bhc-border);font-weight:900;background:var(--bhc-soft)}.bhc-ref-card img{width:100%;height:210px;display:block;object-fit:cover;background:#fff}@media(max-width:960px){.bhc-reference-board-grid{grid-template-columns:1fr}}@media(max-width:720px){.bhc-code-grid,.bhc-toggle-row--3,.bhc-preview-stage--split,.bhc-preview-stage--grid{grid-template-columns:1fr}.bhc-selection-card img,.bhc-ref-card 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