/* Gesprächskategorien: scrollbarfrei, mit ruhigen Navigationspfeilen.
   Nur die Themenleiste im Austausch ist betroffen. */
.topic-rail {
  min-width: 0;
  margin: 37px 0 24px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.topic-rail[data-overflow="true"] {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 44px;
  align-items: center;
}
.topic-rail .topic-nav {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  min-width: 0;
  width: 100%;
  margin: 0;
  padding: 5px 0 2px;
  gap: 5px;
  border: 0;
  overflow-x: auto;
  overflow-y: hidden;
  /* Ohne JavaScript bleibt die native Scrollleiste verfügbar. */
  scrollbar-width: thin;
  scroll-behavior: smooth;
  scroll-snap-type: x proximity;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}
.topic-rail[data-ready="true"] .topic-nav { scrollbar-width: none; -ms-overflow-style: none; }
.topic-rail[data-ready="true"] .topic-nav::-webkit-scrollbar { display: none; }
/* Sanft auslaufende Themen am Rand statt abrupt abgeschnittener Beschriftungen. */
.topic-rail[data-overflow="true"] .topic-nav {
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 22px, #000 calc(100% - 22px), transparent 100%);
  mask-image: linear-gradient(to right, transparent 0, #000 22px, #000 calc(100% - 22px), transparent 100%);
}
.topic-rail[data-overflow="true"][data-start="true"] .topic-nav {
  -webkit-mask-image: linear-gradient(to right, #000 0, #000 calc(100% - 24px), transparent 100%);
  mask-image: linear-gradient(to right, #000 0, #000 calc(100% - 24px), transparent 100%);
}
.topic-rail[data-overflow="true"][data-end="true"] .topic-nav {
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 100%);
  mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 100%);
}
.topic-rail .topic-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 51px;
  padding: 13px 17px 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
  font-weight: 650;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  scroll-snap-align: start;
  text-decoration: none;
}
.topic-rail .topic-nav a:first-child { padding-left: 17px; }
.topic-rail .topic-nav a.current,
.topic-rail .topic-nav a[aria-current="page"] {
  color: var(--rust-dark);
  border-bottom-color: var(--rust);
}
.topic-rail .topic-nav a:hover:not(.current) {
  color: var(--ink);
  background: rgba(255,255,255,.42);
}
.topic-rail .topic-nav:focus-visible,
.topic-rail .topic-nav a:focus-visible,
.topic-rail .topic-rail__step:focus-visible {
  outline: 2px solid var(--rust-dark);
  outline-offset: -2px;
}
.topic-rail .topic-rail__step {
  display: grid;
  place-items: center;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--green);
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}
.topic-rail .topic-rail__step::before {
  position: absolute;
  content: '';
  inset: 5px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  transition: background-color .15s ease;
}
.topic-rail .topic-rail__step:hover:not(:disabled)::before { background: #e5eae2; }
.topic-rail .topic-rail__step:disabled { opacity: .28; cursor: default; }
.topic-rail .topic-rail__step svg {
  position: relative;
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.topic-rail .topic-rail__step[hidden] { display: none !important; }
@media (max-width: 640px) {
  .topic-rail { margin: 24px 0 21px; }
  .topic-rail .topic-nav a { min-height: 49px; font-size: 12px; padding: 12px 13px 11px; }
  .topic-rail .topic-nav a:first-child { padding-left: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  .topic-rail .topic-nav { scroll-behavior: auto; }
  .topic-rail .topic-rail__step::before { transition: none; }
}