:root {
  --paper: #e6ece9;
  --ink: #16282c;
  --river: #35565c;
  --muted: #56686a;
  --rule: #c3cfcb;
  --signal: #f4b400;
  --signal-ink: #16282c;

  --cat-passenger: #1f5fa8;
  --cat-cargo: #b0501a;
  --cat-work: #2c7a4b;
  --cat-leisure: #7a4fa0;
  --cat-other: #6b7a80;

  --serif: 'Newsreader', 'Iowan Old Style', Georgia, serif;
  --sans: 'Public Sans', system-ui, sans-serif;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1e21;
    --ink: #e2ebe7;
    --river: #8fb3b5;
    --muted: #93a5a5;
    --rule: #2a3f43;

    --cat-passenger: #6aa5ee;
    --cat-cargo: #e48a52;
    --cat-work: #5cc28a;
    --cat-leisure: #b690dc;
    --cat-other: #9aa8ad;

    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

h2 {
  margin: 0 0 0.75rem;
  font: 600 1rem/1.3 var(--sans);
}

.quiet {
  color: var(--muted);
}

/* Layout: tier pinned top-left, schedule + list scroll beneath, map on the right. */
.layout {
  display: grid;
  height: 100%;
  grid-template-columns: minmax(340px, 30rem) 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    'tier map'
    'rest map';
}

.tier {
  grid-area: tier;
  padding: 1.5rem 1.75rem 1.75rem;
  border-bottom: 1px solid var(--rule);
}

.map {
  grid-area: map;
  min-height: 60vh;
  background: var(--paper);
}

.rest {
  grid-area: rest;
  overflow-y: auto;
  padding: 1.5rem 1.75rem 2rem;
  display: grid;
  gap: 2rem;
  align-content: start;
}

@media (max-width: 800px) {
  .layout {
    height: auto;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    grid-template-areas: 'tier' 'map' 'rest';
  }
  .tier,
  .rest {
    padding-inline: 1rem;
  }
  .rest {
    overflow: visible;
  }
}

/* Tier: the one loud thing on the page. */
.site {
  margin: 0 0 1.25rem;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--river);
}

.place {
  margin: 0;
  font: italic 400 1.25rem/1.2 var(--serif);
  color: var(--river);
}

.state {
  margin: 1rem 0 0.25rem;
  color: var(--muted);
}

.ship {
  margin: 0;
  font: italic 500 clamp(2.5rem, 6vw, 3.75rem) / 1 var(--serif);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

/* Same yellow as the ship's marker on the map, so the two read as one. */
.ship-mark {
  background: linear-gradient(transparent 62%, var(--signal) 62%, var(--signal) 90%, transparent 90%);
  padding-inline: 0.05em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.facts {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.next {
  margin-top: 1.5rem;
}

.next-when {
  margin: 0;
  font: 600 1.625rem/1.2 var(--sans);
  font-variant-numeric: tabular-nums;
}

.next-what {
  margin: 0.25rem 0 0;
}

.next-what strong {
  font-weight: 600;
}

.overdue {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.error {
  margin: 1rem 0 0;
  color: var(--cat-cargo);
}

/* Schedule: a real sequence, so a timeline. */
.schedule {
  list-style: none;
  margin: 0;
  padding: 0;
}

.schedule li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--rule);
}

.schedule li.past {
  color: var(--muted);
}

.schedule time {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.name {
  font: italic 500 1.125rem/1.3 var(--serif);
}

/* Vessel list */
.vessels {
  list-style: none;
  margin: 0;
  padding: 0;
}

.vessels button {
  all: unset;
  box-sizing: border-box;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1.25rem 1fr auto;
  align-items: baseline;
  gap: 0.75rem;
  width: 100%;
  padding: 0.55rem 0.25rem;
  border-top: 1px solid var(--rule);
}

.vessels button:hover {
  background: color-mix(in srgb, var(--rule) 40%, transparent);
}

.vessels button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.vessels .kind {
  display: block;
  font-size: 0.875rem;
  color: var(--muted);
}

.vessels .motion {
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  text-align: right;
}

.swatch {
  align-self: center;
}

/* Not heard from recently: the position shown is old. */
.vessels button.stale .name,
.vessels button.stale .swatch {
  opacity: 0.5;
}

.boat.stale {
  opacity: 0.4;
}

.sources {
  font-size: 0.875rem;
  color: var(--muted);
}

.sources p {
  margin: 0 0 0.5rem;
  max-width: 60ch;
}

/* Map furniture */
.boat {
  cursor: pointer;
  line-height: 0;
}

.boat svg {
  display: block;
  overflow: visible;
}

.tier-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font: italic 500 0.95rem/1 var(--serif);
  color: var(--ink);
  white-space: nowrap;
  pointer-events: none;
  text-shadow:
    0 0 3px var(--paper),
    0 0 3px var(--paper),
    0 0 3px var(--paper);
}

.legend {
  background: var(--paper);
  color: var(--ink);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font: 400 0.8125rem/1.6 var(--sans);
}

.legend summary {
  cursor: pointer;
  font-weight: 600;
}

.legend[open] summary {
  margin-bottom: 0.25rem;
}

.legend div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.maplibregl-map {
  font-family: var(--sans);
}

/* Beats MapLibre's `.maplibregl-ctrl-group button { display: block }`. */
.maplibregl-ctrl-group .reset-view {
  display: grid;
  place-items: center;
  color: #333;
}

.reset-view svg {
  display: block;
}

/* Boat markers carry z-index 1–3 so the tier ship and moving boats sit on
   top; popups need to clear all of them. */
.maplibregl-popup {
  z-index: 10;
}

.maplibregl-popup-content {
  background: var(--paper);
  color: var(--ink);
  padding: 0.75rem 1.75rem 0.75rem 1rem;
  font-size: 0.875rem;
  line-height: 1.45;
  border-radius: 4px;
}

.maplibregl-popup-anchor-bottom .maplibregl-popup-tip,
.maplibregl-popup-anchor-bottom-left .maplibregl-popup-tip,
.maplibregl-popup-anchor-bottom-right .maplibregl-popup-tip {
  border-top-color: var(--paper);
}
.maplibregl-popup-anchor-top .maplibregl-popup-tip,
.maplibregl-popup-anchor-top-left .maplibregl-popup-tip,
.maplibregl-popup-anchor-top-right .maplibregl-popup-tip {
  border-bottom-color: var(--paper);
}
.maplibregl-popup-anchor-left .maplibregl-popup-tip {
  border-right-color: var(--paper);
}
.maplibregl-popup-anchor-right .maplibregl-popup-tip {
  border-left-color: var(--paper);
}

.maplibregl-popup-close-button {
  color: var(--muted);
  font-size: 1.25rem;
  padding: 0 0.4rem;
}

.maplibregl-popup-content .name {
  display: block;
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}