/* Layout layer — sticky tab bar, asymmetric two-column card sheet, Q&A card grid */

* { box-sizing: border-box; }

.top_deck_bar {
  position: sticky;
  top: 0;
  z-index: 12;
  background: var(--navy);
  color: var(--sand);
  border-bottom: 4px solid var(--buoy);
}
.deck_stamp_line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 0;
  padding: 6px 20px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand_deep);
  border-bottom: 1px solid var(--navy_soft);
}

.tab_strip_nav { overflow-x: auto; }
.tab_strip_list {
  display: flex;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0 12px;
  min-width: max-content;
}
.tab_strip_cell { flex: 0 0 auto; }
.tab_strip_link {
  display: block;
  padding: 11px 13px 10px;
  font-size: 13px;
  color: #cfd9e1;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tab_strip_link:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }
.tab_strip_link.is_open {
  color: #fff;
  border-bottom-color: var(--buoy);
  background: rgba(255, 255, 255, 0.08);
}

.fieldbook_wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.85fr) minmax(240px, 0.85fr);
  gap: 34px;
  max-width: 1140px;
  margin: 0 auto;
  padding: 30px 20px 66px;
  align-items: start;
}
@media (max-width: 900px) {
  .fieldbook_wrap { grid-template-columns: 1fr; gap: 22px; }
}

.primary_sheet {
  background: var(--shell);
  padding: 28px 30px 24px;
  border: 1px solid var(--sand_deep);
  box-shadow: 0 1px 0 var(--sand_deep), 0 10px 26px rgba(18, 38, 60, 0.06);
}
@media (max-width: 620px) {
  .primary_sheet { padding: 20px 18px 18px; }
}

.quick_facts_rail {
  position: sticky;
  top: 96px;
  align-self: start;
}
@media (max-width: 900px) {
  .quick_facts_rail { position: static; }
}

.qa_card_grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 1.4em 0 0;
}
.qa_card_item {
  background: #fff;
  border: 1px solid var(--sand_deep);
  border-left: 4px solid var(--navy_soft);
  padding: 14px 16px 10px;
}
.qa_card_item h3 {
  margin: 0 0 6px;
  font-family: "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 1rem;
  line-height: 1.3;
  color: var(--navy);
}
.qa_card_item p {
  margin: 0 0 0.5em;
  font-size: 0.94rem;
  color: var(--navy_soft);
}
.qa_card_item p:last-child { margin-bottom: 0; }

.quick_facts_rail .rail_card:last-child { margin-bottom: 0; }