/* ============================================================
   MLT Section Index Rail (jump-nav)
   ------------------------------------------------------------
   Markup:
   <nav class="jump-nav" aria-label="Page sections">
     <div class="container jump-row">
       <a href="#section-id">Label</a>
     </div>
   </nav>

   Include shared/jump-nav.js for click highlight + scroll spy.
   Keep scroll-margin-top on targets (~140px).
   Do NOT restyle as rounded-full pills.
   ============================================================ */

.jump-nav {
  --jump-ink: #6a6869;
  --jump-ink-strong: #1a1a1a;
  --jump-accent: #be1e2d;
  position: sticky;
  top: var(--header-h, 80px);
  z-index: var(--z-sticky, 30);
  background:
    linear-gradient(#fff, #fff) padding-box,
    linear-gradient(90deg, #8a1520 0%, #be1e2d 45%, #d63a48 100%) border-box;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  border-top: 2px solid transparent;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04);
}

.jump-nav .container.jump-row,
.jump-nav .jump-row.container,
.jump-row {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 0;
  max-width: var(--container, 1200px);
  margin: 0 auto;
  padding: 0 8px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  counter-reset: jump-item;
}

.jump-row::-webkit-scrollbar {
  display: none;
}

.jump-row a {
  counter-increment: jump-item;
  position: relative;
  flex: 0 0 auto;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  min-height: 58px;
  padding: 10px 16px 12px;
  margin: 0;
  border: none;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--jump-ink);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  scroll-snap-align: start;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.jump-row a::before {
  content: counter(jump-item, decimal-leading-zero);
  display: block;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: rgba(190, 30, 45, 0.55);
  transition: color 0.2s ease;
}

.jump-row a + a {
  box-shadow: inset 1px 0 0 rgba(0, 0, 0, 0.08);
}

.jump-row a:hover {
  color: var(--jump-ink-strong);
  background: rgba(190, 30, 45, 0.04);
}

.jump-row a:hover::before {
  color: var(--jump-accent);
}

.jump-row a.is-active {
  color: var(--jump-ink-strong);
  font-weight: 750;
  background: linear-gradient(180deg, rgba(190, 30, 45, 0.07) 0%, rgba(190, 30, 45, 0.02) 100%);
  border-bottom-color: var(--jump-accent);
}

.jump-row a.is-active::before {
  color: var(--jump-accent);
}

.jump-row a:focus-visible {
  outline: 2px solid var(--jump-accent);
  outline-offset: -2px;
  z-index: 1;
}

@media (max-width: 760px) {
  .jump-row {
    padding: 0 4px;
  }

  .jump-row a {
    min-height: 52px;
    padding: 8px 12px 10px;
    font-size: 0.74rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .jump-row a,
  .jump-row a::before {
    transition: none;
  }
}