/* Navigation: CRT/JR direction semantics with the active V3 color track. */

.rt-wayfinding {
  position: sticky;
  top: 0;
  z-index: var(--rt-z-nav);
  border-bottom: var(--rt-border-sign) solid var(--rt-color-rail);
  background: var(--rt-color-surface);
}

.rt-wayfinding__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: stretch;
  min-height: 4rem;
}

.rt-wayfinding__brand {
  display: flex;
  align-items: center;
  gap: var(--rt-space-3);
  padding: 0 var(--rt-space-4);
  border-right: var(--rt-border-sign) solid var(--rt-color-rail);
  color: inherit;
  text-decoration: none;
}

.rt-wayfinding__brand-icon {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
}

.rt-wayfinding__code {
  display: grid;
  place-items: center;
  width: 2.5rem;
  aspect-ratio: 1;
  border-radius: var(--rt-radius-badge);
  background: var(--rt-track-accent, var(--rt-v3-orange));
  color: var(--rt-track-accent-ink, var(--rt-v3-ink));
  font-family: var(--rt-font-data);
  font-weight: 600;
}

.rt-wayfinding__name {
  font-weight: 700;
  letter-spacing: var(--rt-tracking-sign);
}

.rt-wayfinding__links {
  display: flex;
  align-items: stretch;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.rt-wayfinding__links::-webkit-scrollbar { display: none; }

.rt-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--rt-space-2);
  padding: 0 var(--rt-space-4);
  border-right: 1px solid var(--rt-color-line);
  color: var(--rt-color-muted);
  font-size: var(--rt-text-small);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--rt-duration-fast) var(--rt-ease-sign), color var(--rt-duration-fast) var(--rt-ease-sign);
}

.rt-nav-link__icon {
  font-size: 1.25em;
  transform: rotate(90deg);
  transition: transform var(--rt-duration-base) var(--rt-ease-sign);
}

.rt-nav-link:hover,
.rt-nav-link[aria-current="page"] {
  background: var(--rt-track-accent, var(--rt-v3-orange));
  color: var(--rt-track-accent-ink, var(--rt-v3-ink));
}

.rt-nav-link:hover .rt-nav-link__icon { transform: rotate(90deg) translateX(-0.125rem); }

.rt-wayfinding__status {
  display: flex;
  align-items: center;
  gap: var(--rt-space-2);
  padding: 0 var(--rt-space-4);
  border-left: var(--rt-border-sign) solid var(--rt-color-rail);
  color: var(--rt-color-muted);
  font-family: var(--rt-font-data);
  font-size: var(--rt-text-small);
  white-space: nowrap;
}

.rt-wayfinding__status::before {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--rt-track-accent, var(--rt-v3-orange));
  content: "";
}

.rt-direction-link {
  display: inline-flex;
  align-items: center;
  gap: var(--rt-space-2);
  border-bottom: 2px solid var(--rt-track-accent, var(--rt-v3-orange));
  color: var(--rt-track-link, var(--rt-v3-ink));
  font-weight: 700;
  text-decoration: none;
}

.rt-direction-link__icon {
  color: var(--rt-track-accent, var(--rt-v3-orange));
  font-size: 1.25em;
  transform: rotate(90deg);
}

.rt-direction-link--external { color: var(--rt-track-link, var(--rt-v3-ink)); }
.rt-direction-link__icon--external { transform: none; }

.rt-direction-link:hover {
  background: var(--rt-track-soft, var(--rt-v3-orange-light));
  color: var(--rt-v3-ink);
}

.rt-section-nav {
  display: grid;
  border: var(--rt-border-sign) solid var(--rt-color-rail);
  background: var(--rt-color-rail);
  color: var(--rt-v3-white);
}

.rt-section-nav__row {
  display: grid;
  grid-template-columns: minmax(5rem, auto) 1fr auto;
  align-items: center;
  gap: var(--rt-space-4);
  padding: var(--rt-space-3) var(--rt-space-4);
  border-bottom: 1px solid var(--rt-v3-white);
  color: inherit;
  text-decoration: none;
}

.rt-section-nav__row:last-child { border-bottom: 0; }

.rt-section-nav__code {
  display: inline-grid;
  place-items: center;
  min-width: 3rem;
  min-height: 2rem;
  background: var(--rt-row-color, var(--rt-track-accent, var(--rt-v3-orange)));
  color: var(--rt-row-ink, var(--rt-track-accent-ink, var(--rt-v3-ink)));
  font-family: var(--rt-font-data);
  font-weight: 600;
}

.rt-section-nav__name { font-weight: 700; }

.rt-section-nav__meta {
  color: var(--rt-v3-white);
  font-size: var(--rt-text-small);
}

.rt-section-nav__row:hover { background: var(--rt-color-screen-soft); }

.rt-section-nav__arrow {
  font-size: 1.5rem;
  transform: rotate(90deg);
}

@media (max-width: 720px) {
  /* 窄屏保持单行横向：brand 与链接同行，链接溢出横向滚动 */
  .rt-wayfinding__inner {
    grid-template-columns: auto minmax(0, 1fr);
    min-height: 3.5rem;
  }

  .rt-wayfinding__brand {
    min-height: 3.5rem;
    border-right: var(--rt-border-sign) solid var(--rt-color-rail);
    padding: 0 var(--rt-space-3);
  }

  .rt-wayfinding__brand-icon {
    width: 2rem;
    height: 2rem;
  }

  .rt-wayfinding__status {
    display: none;
  }

  .rt-wayfinding__links { border-top: 0; }
  .rt-nav-link { padding: 0 var(--rt-space-2); }
  .rt-nav-link__icon { display: none; }
  .rt-section-nav__row { grid-template-columns: auto 1fr auto; gap: var(--rt-space-3); }
  .rt-section-nav__meta { display: none; }
}

/* ============================================================
   rt-transfer-board · 换乘并排牌（规范第 15 节预留，2026-10-29 OO 确认实现）
   参照：JR 东日本上野站 新幹線・改札並列標識 / CRT 两路口换乘并排牌。
   信息结构遵守 15.3：编号先行；一块牌一个去向；跨轨换牌即换色。
   ============================================================ */

.rt-transfer-board {
  display: grid;
  border: var(--rt-border-sign) solid var(--rt-color-rail);
  background: var(--rt-color-surface);
  box-shadow: var(--rt-shadow-sign);
}

.rt-transfer-board__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
}

.rt-transfer-board__cell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--rt-space-3);
  min-height: 7rem;
  padding: var(--rt-space-4);
  border-right: 1px solid var(--rt-color-rail);
  border-bottom: 1px solid var(--rt-color-rail);
  color: var(--rt-color-ink);
  text-decoration: none;
}

.rt-transfer-board__row .rt-transfer-board__cell:last-child {
  border-right: 0;
}

.rt-transfer-board__cell:hover {
  background: var(--rt-color-screen-soft);
  color: var(--rt-v3-white);
}

.rt-transfer-board__cell--current {
  background: var(--rt-track-accent, var(--rt-v3-orange));
  color: var(--rt-track-accent-ink, var(--rt-v3-ink));
}

.rt-transfer-board__cell--current:hover {
  background: color-mix(in srgb, var(--rt-track-accent, var(--rt-v3-orange)) 88%, var(--rt-v3-ink));
}

.rt-transfer-board__cell--planned {
  background: repeating-linear-gradient(
    135deg,
    color-mix(in srgb, var(--rt-color-line) 30%, transparent) 0 0.5rem,
    transparent 0.5rem 1rem
  ), var(--rt-color-surface);
  color: var(--rt-color-muted);
}

.rt-transfer-board__code {
  display: grid;
  place-items: center;
  min-width: 3.5rem;
  aspect-ratio: 1;
  border: 2px solid currentColor;
  border-radius: var(--rt-radius-badge);
  font-family: var(--rt-font-data);
  font-size: var(--rt-text-small);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: center;
}

.rt-transfer-board__body {
  display: grid;
  gap: var(--rt-space-1);
  min-width: 0;
}

.rt-transfer-board__name {
  font-size: var(--rt-text-title);
  font-weight: 700;
  line-height: 1.18;
}

.rt-transfer-board__en {
  display: block;
  margin-top: 0.125rem;
  font-family: var(--rt-font-latin);
  font-size: var(--rt-text-micro);
  font-weight: 600;
  letter-spacing: 0.08em;
  opacity: 0.78;
  text-transform: uppercase;
}

.rt-transfer-board__note {
  font-size: var(--rt-text-small);
  opacity: 0.86;
}

.rt-transfer-board__arrow {
  font-size: 1.375rem;
}

.rt-transfer-board__cell--current .rt-transfer-board__arrow {
  transform: rotate(90deg);
}

.rt-transfer-board__foot {
  margin: 0;
  padding: var(--rt-space-2) var(--rt-space-4);
  background: var(--rt-v3-ink);
  color: var(--rt-v3-white);
  font-size: var(--rt-text-small);
  letter-spacing: 0.08em;
  text-align: center;
}

@media (max-width: 720px) {
  .rt-transfer-board__row {
    grid-template-columns: 1fr;
  }

  .rt-transfer-board__cell {
    min-height: 5.5rem;
  }
}