:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1f2933;
  --muted: #65727e;
  --line: #d5dbe1;
  --grid: #e6eaee;
  --grid-strong: #c3cbd3;
  --accent: #2563c9;
  --accent-soft: #dbe6f8;
  --danger: #b42318;
  --warn: #b25e00;
  --plot: #ffffff;
  --train: #5a6b7d;
  --deadhead: #8a8f96;
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  font-size: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15191e;
    --panel: #1d232a;
    --text: #e3e8ee;
    --muted: #94a0ac;
    --line: #333c46;
    --grid: #262e37;
    --grid-strong: #3c4652;
    --accent: #6ea2ff;
    --accent-soft: #24344f;
    --danger: #ff8a80;
    --warn: #f0a640;
    --plot: #11151a;
    --train: #9aa9b8;
    --deadhead: #858b93;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}

input[type="text"],
input[type="number"],
select,
textarea {
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.bar h1 {
  margin: 0 8px 0 0;
  font-size: 16px;
}

.bar .gap {
  flex: 1;
}

.bar .language {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
}

#timetable-name {
  width: 220px;
}

.main {
  display: grid;
  grid-template-columns: minmax(170px, 230px) 1fr minmax(230px, 300px);
  min-height: 0;
}

/* On a narrow screen the inspector goes under the diagram, which keeps the width. */
@media (max-width: 1000px) {
  .main {
    grid-template-columns: minmax(150px, 200px) 1fr;
    grid-template-rows: 1fr auto;
  }

  /* A height of its own, so that the diagram does not change size, and its rows move, with what is in it. */
  .side.right {
    grid-column: 1 / -1;
    height: 32vh;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}

.side {
  overflow-y: auto;
  padding: 8px 12px;
  background: var(--panel);
}

.side.left {
  border-right: 1px solid var(--line);
}

.side.right {
  border-left: 1px solid var(--line);
}

h2 {
  margin: 12px 0 6px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
}

.list {
  margin: 0 0 8px;
  padding: 0;
  list-style: none;
}

.list li {
  padding: 4px 6px;
  border-radius: 6px;
  cursor: pointer;
  overflow-wrap: anywhere;
}

.list li:hover {
  background: var(--accent-soft);
}

.list li.selected {
  background: var(--accent-soft);
  outline: 1px solid var(--accent);
}

.list .sub {
  color: var(--muted);
  font-size: 12px;
}

/* The diagram or the map, with the switch between them and the map's tools above. */
.centre {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.view-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.view-switch {
  display: flex;
  gap: 4px;
}

.map-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.map-tools[hidden],
#map[hidden],
#diagram[hidden],
#map-dimension[hidden] {
  display: none;
}

.map-tools .note {
  color: var(--muted);
  font-size: 12px;
}

.menu {
  position: relative;
}

.menu summary {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  list-style: none;
}

.menu summary::-webkit-details-marker {
  display: none;
}

.menu[open] summary {
  border-color: var(--accent);
}

.menu-list {
  position: absolute;
  z-index: 5;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  max-height: 50vh;
  overflow-y: auto;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  box-shadow: 0 4px 16px rgb(0 0 0 / 15%);
}

.menu-list .note {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 12px;
}

label.check {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
}

#diagram-area {
  flex: 1;
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--plot);
}

#diagram {
  display: block;
  width: 100%;
  height: 100%;
  user-select: none;
  touch-action: none;
}

#empty-message {
  position: absolute;
  inset: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  pointer-events: none;
}

#map {
  display: block;
  width: 100%;
  height: 100%;
  user-select: none;
  touch-action: none;
  cursor: grab;
}

#map .track {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

#map .track.other {
  stroke: var(--grid-strong);
  stroke-width: 2;
}

#map .track.hidden {
  stroke: var(--grid-strong);
  stroke-width: 2;
  stroke-dasharray: 4 4;
}

#map .track.shown {
  stroke: var(--train);
  stroke-width: 3;
}

/* A stretch with track tags, in a tag's colour (the stroke attribute); stripes for more than one. */
#map .track.tagged {
  stroke-width: 3;
  stroke-linecap: butt;
}

/* A track tag's colour beside its name in the map's menu of tags. */
.tag-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  border-radius: 2px;
  vertical-align: middle;
}

#map .track.chosen {
  stroke: var(--accent);
  stroke-width: 5;
  stroke-opacity: 0.7;
}

#map .map-station {
  fill: var(--plot);
  stroke: var(--text);
  stroke-width: 1.5;
}

#map .map-station.current {
  fill: var(--accent);
  stroke: var(--accent);
}

#map .map-station-name {
  font-size: 12px;
  fill: var(--text);
  paint-order: stroke;
  stroke: var(--plot);
  stroke-width: 3px;
}

#map .map-station-name.current {
  font-weight: 600;
  fill: var(--accent);
}

#map .map-signal .head {
  stroke: #20262c;
  stroke-width: 8;
  stroke-linecap: round;
}

#map .map-limit circle {
  fill: #ffffff;
  stroke: #d23b2f;
  stroke-width: 2;
}

#map .map-limit text {
  font-size: 8px;
  font-weight: 700;
  fill: #20262c;
}

#map .map-limit.release circle {
  stroke: #20262c;
}

#map .map-limit.release line {
  stroke: #20262c;
  stroke-width: 1.5;
}

#map .map-train line {
  stroke: #e8590c;
  stroke-width: 5;
  stroke-linecap: round;
}

#map .map-train text {
  font-size: 11px;
  fill: #e8590c;
  paint-order: stroke;
  stroke: var(--plot);
  stroke-width: 3px;
}

#inspector .note.key {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 11px;
  overflow-wrap: anywhere;
}

#diagram.drawing {
  cursor: crosshair;
}

input.bad {
  border-color: var(--danger);
  outline: 1px solid var(--danger);
}

input.warn {
  border-color: var(--warn);
  outline: 1px solid var(--warn);
}

input.seconds {
  width: 56px;
}

#draw-train,
#add-duty,
#add-line {
  margin-bottom: 6px;
}

#diagram .train.dim {
  opacity: 0.3;
}

#diagram .train.in-duty .shown {
  stroke-width: 3;
}

#inspector .duty-trains li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

#inspector .duty-trains button,
#inspector .candidates button {
  padding: 0 6px;
}

#diagram .grid {
  stroke: var(--grid);
}

#diagram .grid.strong {
  stroke: var(--grid-strong);
}

#diagram .label {
  fill: var(--muted);
  font-size: 12px;
}

/* The time scale: the hours large and dark, the minutes between them small and pale. */
#diagram .label.hour {
  fill: var(--text);
  font-size: 16px;
  font-weight: 700;
}

#diagram .label.minute {
  font-size: 11px;
}

#diagram .station {
  fill: var(--text);
  font-size: 12px;
}

#diagram .train .shown {
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
}

#diagram .train.deadhead .shown {
  stroke-dasharray: 5 4;
}

#diagram .train.selected .shown {
  stroke-width: 3.2;
}

#diagram .train .hit {
  fill: none;
  stroke: transparent;
  stroke-width: 12;
  cursor: grab;
}

/* The way between two stops, which moves alone, along the time. */
#diagram .train .hit.run {
  cursor: ew-resize;
}

#diagram .train .number {
  font-size: 11px;
}

#diagram .point {
  stroke: var(--panel);
  stroke-width: 1.5;
  cursor: move;
}

/* A point that makes a stop stand longer or shorter (its arrival, or its departure) rather than moving it. */
#diagram .point.stretch {
  cursor: col-resize;
}

/* While a stop or a way is dragged, the way as the train would run it fastest, by the track. */
#diagram .wait {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  pointer-events: none;
}

#diagram .wait-head {
  fill: var(--accent);
}

#diagram .guide {
  fill: none;
  stroke: var(--danger);
  stroke-width: 1.8;
  stroke-dasharray: 5 4;
  pointer-events: none;
}

/* The times a drag has come to, beside the pointer. */
#diagram .drag-box {
  fill: var(--panel);
  stroke: var(--line);
  pointer-events: none;
}

#diagram .drag-text {
  fill: var(--text);
  font-size: 12px;
  pointer-events: none;
}

#diagram .preview {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
  stroke-dasharray: 3 3;
}

footer {
  max-height: 25vh;
  overflow-y: auto;
  padding: 6px 12px 8px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}

footer h2 {
  margin: 6px 0 4px;
}

.status {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
}

.problems li {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12px;
  color: var(--danger);
}

/* A train faster than the track: not a mistake the mod refuses, but one to look at. */
.problems li.warning {
  color: var(--warn);
}

#inspector .note.held {
  color: var(--warn);
}

#inspector table {
  width: 100%;
  border-collapse: collapse;
}

#inspector th,
#inspector td {
  padding: 2px 3px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-weight: normal;
}

#inspector th {
  color: var(--muted);
  font-size: 12px;
}

#inspector td input {
  width: 80px;
}

/*
 * A train's stops keep to the panel's width: the times and the button have the width they need,
 * and the station takes what is left, a long name cut short. A time's column is in ch of the
 * table's font, so that "08:06:30" fits in whatever font the page is shown in: six digits of
 * 1ch, two colons of less, and the box's padding and border (14px) and the cell's padding (6px).
 */
#inspector table.stops {
  table-layout: fixed;
}

#inspector table.stops col.time {
  width: calc(7.5ch + 20px);
}

#inspector table.stops col.remove {
  width: 34px;
}

#inspector table.stops td > select,
#inspector table.stops td > input {
  width: 100%;
}

#inspector table.stops td > input {
  font-variant-numeric: tabular-nums;
}

/* Narrower than other buttons, to keep within its column (28px inside the cell's padding). */
#inspector table.stops td > button {
  padding: 4px 6px;
}

/* The row under a stop's times, with how long the train stands there. */
#inspector tr.stop-times td {
  padding-top: 0;
  color: var(--muted);
  font-size: 12px;
}

#inspector tr.stop-times label {
  margin-right: 10px;
  white-space: nowrap;
}

#inspector tr.stop-times input.seconds {
  width: 52px;
}

#inspector tr.stop-times input.type-from {
  width: 80px;
}

#inspector tr.stop-times .waits {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin-top: 4px;
}

#inspector tr.stop-times .wait-add select {
  max-width: 110px;
}

#inspector tr:has(+ tr.stop-times) td {
  border-bottom: none;
}

#inspector .field {
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: center;
  gap: 6px;
  margin: 6px 0;
}

#inspector .buttons,
dialog .buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

dialog {
  width: min(720px, 92vw);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  padding: 16px;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.35);
}

dialog h2 {
  margin-top: 0;
  font-size: 15px;
  color: var(--text);
}

dialog textarea {
  width: 100%;
  height: 240px;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12px;
}

dialog .help {
  color: var(--muted);
  margin: 0 0 8px;
}

dialog .error {
  color: var(--danger);
  white-space: pre-wrap;
  font-size: 12px;
}

dialog .note {
  color: var(--muted);
  font-size: 12px;
}

dialog .columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

dialog .picker {
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px;
}

dialog .picker li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  padding: 2px 4px;
}

dialog .picker li button {
  padding: 0 6px;
}

dialog .field {
  display: grid;
  grid-template-columns: 120px 1fr;
  align-items: center;
  gap: 8px;
  margin: 6px 0;
}

dialog .scroll {
  max-height: 55vh;
  overflow-y: auto;
}

dialog table.station-times {
  width: 100%;
  border-collapse: collapse;
}

dialog table.station-times th,
dialog table.station-times td {
  padding: 3px 6px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-weight: normal;
}

dialog table.station-times th {
  color: var(--muted);
  font-size: 12px;
}

/* The types and their colours: the samples, the palette and the colour written out. */
dialog table.types {
  width: 100%;
  border-collapse: collapse;
}

dialog table.types th,
dialog table.types td {
  padding: 3px 6px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-weight: normal;
}

dialog table.types th {
  color: var(--muted);
  font-size: 12px;
}

dialog table.types td.colours {
  display: flex;
  align-items: center;
  gap: 6px;
}

dialog table.types .samples {
  display: inline-flex;
  gap: 3px;
}

dialog table.types button.sample {
  width: 16px;
  height: 16px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 3px;
}

dialog table.types input[type="color"] {
  width: 32px;
  height: 22px;
  padding: 0 2px;
}

dialog table.types input.colour {
  width: 72px;
  font-family: ui-monospace, monospace;
}

dialog table.types td.order {
  white-space: nowrap;
}

dialog table.types td.order button {
  padding: 0 6px;
}