/* =============================================================================
   Pep Research -- product pages (/products/<slug>), Pepvela refocus 2026-10-11.
   Markup: scripts/generate-product-pages.js. Two-column hero (the large vial
   on a .pvb-vial well; name, strength, price, stock, quantity + Add to Order,
   the supported facts), then tabs (Overview, Research, Testing, Shipping, FAQ)
   and related products as .pvb-product cards.
   ============================================================================= */

.pr-phero { padding: clamp(20px, 3vw, 32px) 0 clamp(40px, 6vw, 72px); background: linear-gradient(180deg, var(--brand-surface) 0%, var(--brand-white) 70%); }
.pr-phero .pr-crumbs { margin-bottom: clamp(18px, 3vw, 28px); }
.pr-pdetail { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }

.pr-pmedia { position: sticky; top: calc(var(--brand-header-h) + 20px); }
.pr-pvial { aspect-ratio: 1 / 1; border: 1px solid var(--brand-line); box-shadow: var(--brand-shadow); }

.pr-pinfo { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; padding-top: 4px; }
.pr-pinfo h1 { font-size: clamp(30px, 3.4vw, 42px); line-height: 1.12; letter-spacing: -0.025em; color: var(--brand-navy); }
.pr-pstrength { margin-top: -6px; font-size: 16px; font-weight: 600; color: var(--brand-muted); }
.pr-pprice { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.product-price { font-size: 30px; font-weight: 700; line-height: 1; letter-spacing: -0.02em; color: var(--brand-navy); font-variant-numeric: tabular-nums; }
.pr-plead { max-width: 56ch; font-size: 16px; line-height: 1.65; color: var(--brand-ink-2); }

.pr-pbuy { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; width: 100%; padding-top: 4px; }
.pr-pbuy .sf-qty-page { margin: 0; }
.pr-pbuy .sf-qty-dec, .pr-pbuy .sf-qty-inc { width: 44px; height: 46px; }
.pr-pbuy .btn-add-list { flex: 1 1 160px; max-width: 320px; }
.pr-pbuy .btn-oos { opacity: 0.5; cursor: not-allowed; box-shadow: none; }
.pr-pbuy .sf-inquiry-link { flex-basis: 100%; margin-top: 2px; font-size: 14px; }

.pr-facts { display: grid; gap: 10px; width: 100%; margin: 6px 0 0; padding: 16px 0 0; border-top: 1px solid var(--brand-line); }
.pr-facts li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: start; font-size: 14.5px; line-height: 1.5; color: var(--brand-ink-2); }
.pr-facts svg { width: 20px; height: 20px; margin-top: 1px; color: var(--brand-indigo); }
.pr-facts a { font-weight: 650; }
.pr-pnote { font-size: 13px; line-height: 1.55; color: var(--brand-muted); }

/* tabs (WAI-ARIA tablist, js/v3-shell.js) */
.pr-ptabs { padding: clamp(40px, 6vw, 72px) 0; border-top: 1px solid var(--brand-line); }
.tab-buttons { display: flex; gap: 4px; margin-bottom: 28px; border-bottom: 1px solid var(--brand-line); overflow-x: auto; scrollbar-width: none; }
.tab-buttons::-webkit-scrollbar { display: none; }
.tab-btn { flex: none; min-height: 46px; padding: 0 16px; border: 0; border-radius: 0; background: none; color: var(--brand-muted); font: 650 15px/1 var(--brand-font); cursor: pointer; box-shadow: inset 0 -2px 0 transparent; transition: color 0.2s, box-shadow 0.2s; }
.tab-btn:hover { color: var(--brand-navy); }
.tab-btn.active, .tab-btn[aria-selected="true"] { color: var(--brand-navy); box-shadow: inset 0 -2px 0 var(--brand-indigo); }
.tab-btn:focus-visible { outline: 2px solid var(--brand-focus); outline-offset: -2px; }
.tab-content { max-width: 760px; }
.tab-content:focus-visible { outline: 2px solid var(--brand-focus); outline-offset: 6px; border-radius: 4px; }
.tab-content > * + * { margin-top: 14px; }
.tab-content h2 { font-size: 22px; line-height: 1.3; }
.tab-content p, .tab-content li { font-size: 16px; line-height: 1.7; color: var(--brand-ink-2); }
.tab-content a:not(.pvb-btn):not(.pvb-link) { color: var(--brand-indigo); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--brand-tint-2); }
.pr-list { display: grid; gap: 8px; padding-left: 20px; list-style: disc; }
.pr-list li::marker { color: var(--brand-indigo); }
.pr-storage strong { color: var(--brand-navy); }

.data-table { width: 100%; border-collapse: collapse; border: 1px solid var(--brand-line); border-radius: var(--brand-radius); overflow: hidden; font-size: 15px; }
.data-table tr + tr td { border-top: 1px solid var(--brand-line); }
.data-table td { padding: 12px 16px; vertical-align: top; color: var(--brand-navy); }
.data-table td:first-child { width: 42%; color: var(--brand-muted); font-weight: 600; background: var(--brand-surface); }
.spec-seq { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; word-break: break-all; }

.pr-cert { display: grid; gap: 14px; justify-items: start; padding: 20px 22px; border: 1px solid var(--brand-line); border-radius: var(--brand-radius); background: var(--brand-surface); }
.pr-cert-lab { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--brand-navy) !important; }
.pr-cert-lab svg { width: 20px; height: 20px; color: var(--brand-indigo); }
.pr-cert dl { display: grid; grid-template-columns: repeat(3, minmax(0, auto)); gap: 8px 32px; margin: 0; }
.pr-cert dt { font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brand-muted); }
.pr-cert dd { margin: 2px 0 0; font-size: 15px; font-weight: 600; color: var(--brand-navy); }

.pr-faq { display: grid; gap: 0; border-top: 1px solid var(--brand-line); }
.pr-faq .faq-item { padding: 18px 0; border-bottom: 1px solid var(--brand-line); }
.pr-faq .faq-item h3 { font-size: 16.5px; line-height: 1.4; }
.pr-faq .faq-item p { margin-top: 6px; }

.pr-related { padding: clamp(40px, 6vw, 72px) 0 0; border-top: 1px solid var(--brand-line); }
.pr-related h2 { margin-bottom: 22px; font-size: clamp(22px, 2.4vw, 28px); }
.pr-related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 960px) {
  .pr-pdetail { grid-template-columns: 1fr; }
  .pr-pmedia { position: static; max-width: 520px; width: 100%; margin: 0 auto; }
}
@media (max-width: 760px) {
  .pr-related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pr-related-grid > :nth-child(3) { display: none; }
  .pr-cert dl { grid-template-columns: 1fr; }
  .pr-pbuy .btn-add-list { max-width: none; }
}