/* Shared interface palette. Route identity and operational states remain data. */
:root {
  color-scheme: light;
  --font-body: Helvetica, "Helvetica Neue", Arial, sans-serif;
  --blue: #003d85; --red: #d52b1e; --paper: #fff; --ink: #131b26;
  --surface: #f1f4f7; --rule: #cbd3dc; --focus: #ffdf45;
  --route-width: 4px; --station-size: 16px; --gutter: 32px;
  --map-background: #1b2833; --alert-ink: #8b250d;
  font-family: var(--font-body); background: var(--paper); color: var(--ink);
  font-variant-numeric: tabular-nums;
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.5; }
a { color: var(--blue); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
a:focus-visible, button:focus-visible { background: var(--focus); color: var(--ink); }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 2000; padding: 12px; background: var(--paper); }
.skip-link:focus { top: 12px; }
.masthead { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 28px; padding: 24px var(--gutter); background: var(--blue); color: var(--paper); border-bottom: 6px solid var(--red); }
.brand { color: inherit; font-size: 18px; font-weight: 700; text-decoration: none; }
h1 { margin: 0; font-size: clamp(26px, 3vw, 36px); line-height: 1.1; letter-spacing: -.03em; }
.route-nav { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); margin: 0 var(--gutter); padding: 16px 0 8px; }
.route-nav a { min-width: 0; position: relative; padding: 0 8px 24px; text-align: center; color: var(--ink); font-size: 14px; font-weight: 700; text-decoration: none; overflow-wrap: anywhere; }
.route-nav a::before { content: ""; position: absolute; left: 0; right: 0; bottom: calc((var(--station-size) - var(--route-width))/2); height: var(--route-width); background: var(--blue); }
.route-nav a::after { content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); width: var(--station-size); height: var(--station-size); border: 3px solid var(--blue); border-radius: 50%; background: var(--paper); }
.route-nav a[aria-current] { text-decoration: underline; }
.route-nav a[aria-current]::after { border-color: var(--red); }
.toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 24px; padding: 16px var(--gutter); border-bottom: 1px solid var(--rule); }
.toolbar label { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: 14px; font-weight: 700; }
select, button { min-height: 44px; max-width: 100%; padding: 8px 12px; border: 1px solid var(--blue); border-radius: 0; background: var(--paper); color: var(--ink); font: inherit; }
button { cursor: pointer; color: var(--blue); font-weight: 700; }
button:hover { background: var(--surface); }
input[type="checkbox"] { width: 18px; height: 18px; margin: 0; accent-color: var(--blue); }
#count { font-size: 14px; }
#clock { margin-left: auto; font-size: 14px; white-space: nowrap; }
#map { height: calc(100dvh - 300px); min-height: 400px; background: var(--map-background); }
.status { padding: 20px var(--gutter) 28px; font-size: 14px; max-width: 1000px; }
.status p { margin: 8px 0; }
#status { margin-top: 0; font-size: 18px; font-weight: 700; }
#alerts { color: var(--alert-ink); font-weight: 700; }
#alerts:not(:empty) { padding-left: 12px; border-left: 4px solid var(--red); }
.attribution { padding-top: 12px; border-top: 1px solid var(--rule); }
noscript { display: block; padding: 12px var(--gutter); }
.leaflet-container { font-family: var(--font-body); }
.leaflet-popup-content-wrapper, .leaflet-popup-tip { background: var(--paper); color: var(--ink); }
.leaflet-popup-content-wrapper { border-radius: 0; }
.leaflet-tooltip { color: var(--ink); }
.leaflet-control-attribution { color: var(--ink); }
.leaflet-control-attribution a { color: var(--blue); }
@media (max-width: 700px) {
  :root { --gutter: 20px; }
  .masthead { padding-block: 20px; gap: 8px; flex-direction: column; }
  .route-nav { margin-inline: 12px; }
  .route-nav a { padding-inline: 4px; }
  .toolbar { gap: 8px 16px; }
  #clock { margin-left: 0; width: 100%; }
  #map { height: 60dvh; min-height: 340px; }
}
@media print {
  .skip-link, .route-nav, .toolbar { display: none; }
  .masthead { background: var(--paper); color: var(--ink); border-color: var(--ink); }
  #map { height: 55vh; min-height: 0; }
}