/* ─── PRODUCT NAV TABS ─── */
.product-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 60px;
  background: var(--bg);
  position: sticky;
  top: 64px;
  z-index: 90;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.product-tab {
  padding: 18px 28px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--mid);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.product-tab:hover { color: var(--dark); }
.product-tab.active { color: var(--dark); border-bottom-color: var(--gold); }

/* ─── PRODUCT SECTIONS ─── */
.product-section {
  padding: 80px 60px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 118px; /* fixed navbar (64px) + sticky tabs (~54px) */
}
.product-section-alt { background: var(--ticker-bg); }
.section-heading { font-size: 36px; margin-bottom: 12px; }
.section-sub { font-size: 13px; color: var(--mid); font-weight: 300; line-height: 1.8; max-width: 600px; margin-bottom: 48px; }
.body-text p + p { margin-top: 14px; }
.spec-col { border-left: 1px solid var(--border); padding-left: 40px; }

/* ─── ITEMS TABLE ─── */
.items-table { width: 100%; border-collapse: collapse; margin-top: 36px; }
.items-table th {
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--light);
  font-weight: 600;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  background: transparent;
}
.items-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--mid);
  font-weight: 300;
  vertical-align: top;
}
.items-table tr:hover td { background: rgba(184,169,106,0.04); }
.item-name { font-weight: 600; color: var(--dark); font-size: 13px; }
.item-grade {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--border);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--light);
  margin-top: 4px;
}

/* ─── SPEC CARDS ─── */
.spec-card { background: var(--bg); border: 1px solid var(--border); padding: 28px 24px; height: 100%; }
.spec-value { font-size: 24px; font-weight: 700; color: var(--gold); line-height: 1; margin-bottom: 8px; }
.spec-label { font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--mid); font-weight: 500; }

/* ─── CERTIFICATIONS LIST ─── */
.cert-list { margin-top: 24px; display: flex; flex-direction: column; gap: 16px; }
.cert-item { border-left: 2px solid var(--gold); padding-left: 16px; }
.cert-item-title { font-size: 11px; font-weight: 600; color: var(--dark); margin-bottom: 4px; }
.cert-item-text { font-size: 11px; color: var(--mid); font-weight: 300; }

/* ─── CTA ─── */
.section-cta p { margin-top: 8px; font-weight: 300; }

/* ─── RESPONSIVE: 1200px ─── */
@media (max-width: 1199.98px) {
  .product-tabs { padding: 0 30px; }
  .product-section { padding: 60px 30px; }
}

/* ─── RESPONSIVE: 992px ─── */
@media (max-width: 991.98px) {
  .product-section { scroll-margin-top: 100px; /* fixed navbar (56px) + tabs (~44px) */ }
  .product-tabs { padding: 0 20px; top: 56px; }
  .product-tab { padding: 14px 20px; font-size: 10px; }
  .product-section { padding: 48px 20px; overflow: hidden; }
  .spec-col { border-left: none; padding-left: 0; padding-top: 36px; border-top: 1px solid var(--border); }
  .items-table { font-size: 11px; }
  .items-table th, .items-table td { padding: 10px 8px; word-break: break-word; white-space: normal; }
  .items-table th:last-child, .items-table td:last-child { display: none; }
  .item-grade { white-space: nowrap; }
}

/* ─── RESPONSIVE: 480px ─── */
@media (max-width: 479.98px) {
  .product-tabs { padding: 0 16px; }
  .product-section { padding: 40px 16px; }
  .cert-list { gap: 12px; }
}