:root {
  color-scheme: light dark;
  --slate-1: #fcfcfd; --slate-2: #f9f9fb; --slate-3: #f0f0f3; --slate-4: #e8e8ec;
  --slate-6: #d9d9e0; --slate-8: #b9bbc6; --slate-11: #60646c; --slate-12: #1c2024;
  --slate-a3: #0000330f; --slate-a4: #00002d17; --slate-a8: #00083046;
  --indigo-3: #edf2fe; --indigo-4: #e1e9ff; --indigo-9: #3e63dd; --indigo-10: #3358d4;
  --indigo-11: #3a5bc7; --indigo-12: #1f2d5c; --indigo-a3: #0047f112; --indigo-a4: #0044ff1e;
  --red-11: #ce2c31;
  --green-11: #218358;
  --amber-3: #fff7c2;
  --amber-11: #ab6400;
  --black-a3: rgba(0, 0, 0, 0.15);
  --black-a5: rgba(0, 0, 0, 0.3);

  /* MD3 color roles */
  --surface: var(--slate-1);
  --surface-container-low: var(--slate-2);
  --surface-container: var(--slate-3);
  --on-surface: var(--slate-12);
  --on-surface-variant: var(--slate-11);
  --outline: var(--slate-8);
  --outline-variant: var(--slate-6);
  --primary: var(--indigo-9);
  --primary-hover: var(--indigo-10);
  --on-primary: white;
  --primary-text: var(--indigo-11);
  --primary-container: var(--indigo-3);
  --on-primary-container: var(--indigo-12);
  --secondary-container: var(--indigo-4);
  --on-secondary-container: var(--indigo-12);
  --error: var(--red-11);
  --success: var(--green-11);
  --warning: var(--amber-11);
  --warning-container: var(--amber-3);
  --state-hover: var(--slate-a3);
  --state-pressed: var(--slate-a4);
  --primary-state-hover: var(--indigo-a3);
  --primary-state-pressed: var(--indigo-a4);
  --disabled-container: var(--slate-a3);
  --disabled-content: var(--slate-a8);
  --elevation-2: 0 1px 2px var(--black-a5), 0 2px 6px 2px var(--black-a3);

  /* MD3 type roles, four sizes in total */
  --headline: 22px;
  --body-large: 16px;
  --body-medium: 14px;
  --body-small: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --slate-1: #111113; --slate-2: #18191b; --slate-3: #212225; --slate-4: #272a2d;
    --slate-6: #363a3f; --slate-8: #5a6169; --slate-11: #b0b4ba; --slate-12: #edeef0;
    --slate-a3: #ddeaf814; --slate-a4: #d3edf81d; --slate-a8: #d9edff5d;
    --indigo-3: #182449; --indigo-4: #1d2e62; --indigo-9: #3e63dd; --indigo-10: #5472e4;
    --indigo-11: #9eb1ff; --indigo-12: #d6e1ff; --indigo-a3: #2f62ff3c; --indigo-a4: #3566ff57;
    --red-11: #ff9592;
    --green-11: #3dd68c;
    --amber-3: #302008;
    --amber-11: #ffca16;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  font: 400 var(--body-medium)/20px Roboto, "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
svg { width: 24px; height: 24px; fill: currentColor; flex: none; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1200px;
  height: 64px;
  margin: 0 auto;
  padding: 0 24px;
}

.app-bar h1 { margin: 0; font-size: var(--headline); line-height: 28px; font-weight: 400; }
#version { color: var(--on-surface-variant); font-size: var(--body-small); }

.layout {
  display: grid;
  grid-template-columns: 440px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 24px;
}

.pane {
  position: sticky;
  top: 16px;
  display: grid;
  gap: 24px;
  padding: 24px;
  border-radius: 24px;
  background: var(--surface-container-low);
}

.stations { position: relative; display: grid; gap: 24px; }

#swap {
  position: absolute;
  top: 48px;
  right: 16px;
  z-index: 1;
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}

#swap:hover { background: var(--secondary-container); box-shadow: inset 0 0 0 20px var(--state-hover); }
.stations:has([aria-expanded="true"]) #swap { visibility: hidden; }
#swap:active { box-shadow: inset 0 0 0 20px var(--state-pressed); }

.row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }

/* Outlined text field; labels stay floated because every field always holds a value. */
.text-field {
  position: relative;
  display: flex;
  align-items: center;
  height: 56px;
  border: 0.5px solid var(--outline);
  border-radius: 4px;
}

.text-field:hover { border-color: var(--on-surface); }
.text-field:focus-within { border-color: var(--primary); }

.text-field label {
  position: absolute;
  top: -9px;
  left: 12px;
  padding: 0 4px;
  background: var(--surface-container-low);
  color: var(--on-surface-variant);
  font-size: var(--body-small);
  line-height: 16px;
  pointer-events: none;
}

.text-field:focus-within label { color: var(--primary-text); }

.text-field input, .text-field select {
  width: 100%;
  height: 100%;
  min-width: 0;
  padding: 0 16px;
  border: 0;
  outline: 0;
  background: transparent;
  font-size: var(--body-large);
  appearance: none;
}

.text-field input:focus-visible, .text-field select:focus-visible { outline: 0; }
.stations input { padding-right: 64px; }
.text-field input::placeholder { color: var(--on-surface-variant); opacity: 1; }
.text-field select { padding-right: 48px; cursor: pointer; }
.text-field > svg { position: absolute; right: 12px; color: var(--on-surface-variant); pointer-events: none; }
.text-field input[type="number"] { -moz-appearance: textfield; }
.text-field input::-webkit-inner-spin-button, .text-field input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.suffix { padding-right: 16px; white-space: nowrap; color: var(--on-surface-variant); font-size: var(--body-large); }

.icon-button {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--on-surface-variant);
}

.icon-button:hover { background: var(--state-hover); }
.icon-button:active { background: var(--state-pressed); }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.actions .filled-button { margin-left: auto; }
.switches { display: flex; gap: 24px; }

.switch { display: inline-flex; align-items: center; gap: 12px; cursor: pointer; }
.switch input {
  position: relative;
  width: 52px;
  height: 32px;
  margin: 0;
  border: 0.5px solid var(--outline);
  border-radius: 16px;
  background: var(--surface-container);
  appearance: none;
  cursor: pointer;
  transition: background-color 250ms ease-out, border-color 250ms ease-out;
}
.switch input::before {
  content: "";
  position: absolute;
  top: 7.5px;
  left: 7.5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--outline);
  transition: 250ms ease-out;
  transition-property: top, left, width, height, background-color;
}
.switch input:checked { border-color: var(--primary); background: var(--primary); }
.switch input:checked::before { top: 3.5px; left: 23.5px; width: 24px; height: 24px; background: var(--on-primary); }
.switch input:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.filled-button {
  min-width: 96px;
  height: 40px;
  padding: 0 24px;
  border: 0;
  border-radius: 20px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 500;
}

.filled-button:hover { background: var(--primary-hover); }
.filled-button:disabled { background: var(--disabled-container); color: var(--disabled-content); cursor: default; }
.filled-button.busy, .filled-button.busy:hover { background: var(--secondary-container); color: var(--on-secondary-container); }

.text-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 12px;
  border: 0;
  border-radius: 20px;
  background: transparent;
  color: var(--primary-text);
  font-weight: 500;
}

.text-button svg { width: 18px; height: 18px; }
.text-button:hover { background: var(--primary-state-hover); }
.text-button:active { background: var(--primary-state-pressed); }

.menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 10;
  max-height: 384px;
  overflow-y: auto;
  padding: 8px 0;
  border-radius: 4px;
  background: var(--surface-container);
  box-shadow: var(--elevation-2);
}

.menu button {
  display: flex;
  align-items: center;
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border: 0;
  background: transparent;
  justify-content: space-between;
  gap: 16px;
  font-size: var(--body-large);
  text-align: left;
}

.menu button span { color: var(--on-surface-variant); font-size: var(--body-medium); }

.menu button:hover, .menu button[aria-selected="true"] { background: var(--state-hover); }
.menu p { margin: 0; padding: 14px 16px; color: var(--on-surface-variant); }

.field-button {
  width: 100%;
  height: 100%;
  padding: 0 44px 0 16px;
  overflow: hidden;
  border: 0;
  background: transparent;
  font-size: var(--body-large);
  text-align: left;
  white-space: nowrap;
}

.field-button.empty { color: var(--on-surface-variant); }
.field-button span { margin-left: 8px; color: var(--on-surface-variant); font-size: var(--body-medium); }

.field-button:focus-visible { outline: 0; }

/* MD3 docked date picker and time menu */
.popover {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 10;
  width: min(328px, calc(100vw - 32px));
  padding: 12px;
  border-radius: 16px;
  background: var(--surface-container);
  box-shadow: var(--elevation-2);
}

.popover.end { left: auto; right: 0; }
.popover.time-picker { width: 208px; padding: 12px 8px 8px; }

.time-columns { display: grid; grid-template-columns: 1fr 1fr; }
.time-column + .time-column { border-left: 0.5px solid var(--outline-variant); }

.time-column {
  display: grid;
  gap: 2px;
  height: 248px;
  padding: 0 4px;
  overflow-y: auto;
  scrollbar-width: none;
}

.time-column button {
  height: 32px;
  border: 0;
  border-radius: 16px;
  background: transparent;
}

.time-column button:hover { background: var(--state-hover); }
.time-column button[aria-selected="true"] { background: var(--secondary-container); color: var(--on-secondary-container); font-weight: 500; }

.picker-actions { display: flex; justify-content: space-between; margin-top: 8px; padding-top: 8px; border-top: 0.5px solid var(--outline-variant); }

calendar-date { display: block; width: 100%; --color-accent: var(--primary); --color-text-on-accent: var(--on-primary); }
calendar-date svg { width: 24px; height: 24px; }
calendar-date::part(header) { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
calendar-date::part(heading) { padding-left: 12px; font-weight: 500; }
calendar-date [slot="heading"] { font-size: var(--body-large); }

calendar-date::part(button) {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
}

calendar-date::part(button):hover { background: var(--state-hover); }
calendar-date::part(button):disabled { color: var(--disabled-content); background: transparent; cursor: default; }

calendar-month { display: block; width: 100%; }
calendar-month::part(heading) { display: none; }
calendar-month::part(table) { width: 100%; table-layout: fixed; border-collapse: collapse; }
calendar-month::part(td) { text-align: center; }
calendar-month::part(th) { height: 40px; color: var(--on-surface-variant); font-size: var(--body-small); font-weight: 400; }

calendar-month::part(button) {
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--on-surface);
  font: inherit;
  cursor: pointer;
}

calendar-month::part(button):hover { background: var(--state-hover); }
calendar-month::part(today) { color: var(--primary-text); box-shadow: inset 0 0 0 0.5px var(--primary); }
calendar-month::part(selected) { background: var(--primary); color: var(--on-primary); box-shadow: none; }
calendar-month::part(disallowed) { background: transparent; color: var(--disabled-content); cursor: default; }

.results { display: grid; gap: 16px; min-width: 0; }
#result { display: grid; gap: 16px; }

.results-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.results-bar .text-button { margin-right: -12px; }

.segmented {
  display: inline-flex;
  overflow: hidden;
  border: 0.5px solid var(--outline);
  border-radius: 20px;
}

.segmented button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 112px;
  height: 40px;
  padding: 0 16px;
  border: 0;
  background: transparent;
  font-weight: 500;
}

.segmented button + button { border-left: 0.5px solid var(--outline); }
.segmented button:hover { background: var(--state-hover); }
.segmented svg { display: none; width: 18px; height: 18px; }
.segmented [aria-checked="true"], .segmented [aria-checked="true"]:hover { background: var(--secondary-container); color: var(--on-secondary-container); }
.segmented [aria-checked="true"] svg { display: block; }

.placeholder {
  display: grid;
  place-items: center;
  min-height: 400px;
  border-radius: 24px;
  background: var(--surface-container-low);
  color: var(--outline-variant);
}

.placeholder svg { width: 48px; height: 48px; }

.card { padding: 16px; border-radius: 12px; }

.summary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.summary strong { font-size: var(--headline); line-height: 28px; font-weight: 400; }
.summary strong:nth-of-type(2) { text-align: right; }
.summary > span, .summary .day, .summary .meta { color: var(--primary-text); }
.summary .meta { justify-content: flex-end; }

.day { margin-left: 2px; color: var(--on-surface-variant); font-size: var(--body-small); }

.journey { display: grid; margin: 0; padding: 0; list-style: none; }

.leg { border: 0.5px solid var(--outline-variant); background: var(--surface); }

.leg header { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
.leg header svg { color: var(--primary-text); }
.leg header .meta { margin-left: auto; }
.leg header strong { min-width: 52px; font-size: var(--body-large); font-weight: 500; }
.fare { color: var(--on-surface); }

.meta { display: flex; gap: 16px; color: var(--on-surface-variant); white-space: nowrap; }
.meta span:empty { display: none; }
/* Fares arrive after the result is shown; they extend into free space so nothing else moves. */
#total-fare { order: -1; }

.stop {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 16px;
  padding: 6px 0;
  font-size: var(--body-large);
  line-height: 24px;
}

.stop time { font-weight: 500; }
.stop small { color: var(--on-surface-variant); font-size: var(--body-medium); }
.stop.via { padding: 4px 0; color: var(--on-surface-variant); font-size: var(--body-medium); line-height: 20px; }
.stop.via time { font-weight: 400; }

.via-toggle { height: 32px; margin-left: 60px; padding: 0 8px 0 12px; gap: 4px; }
.via-toggle svg { width: 20px; height: 20px; }
.via-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }

.transfer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 12px 16px;
  color: var(--on-surface-variant);
}

.transfer svg { width: 20px; height: 20px; margin-right: -4px; }
.transfer b { color: var(--on-surface); font-weight: 500; }

.result-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  margin: 0;
  padding: 0 16px;
  color: var(--on-surface-variant);
}

.verified { display: inline-flex; align-items: center; gap: 8px; color: var(--success); }
.verified svg, .unverified svg { width: 18px; height: 18px; flex: none; }
.unverified { display: inline-flex; align-items: center; gap: 8px; color: var(--warning); }

.unlisted {
  padding: 0 8px;
  border-radius: 8px;
  background: var(--warning-container);
  color: var(--warning);
  font-size: var(--body-small);
  line-height: 24px;
}

.state { display: grid; justify-items: start; gap: 4px; padding: 16px; }
.state p { margin: 0; font-size: var(--body-large); line-height: 24px; }
.state p + p { color: var(--on-surface-variant); font-size: var(--body-medium); line-height: 20px; }
.state.error p:first-child { color: var(--error); }
.state .text-button { margin: 8px 0 0 -12px; }

.progress {
  position: relative;
  height: 4px;
  overflow: hidden;
  border-radius: 2px;
  background: var(--secondary-container);
}

.progress::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 40%;
  border-radius: 2px;
  background: var(--primary);
  animation: indeterminate 1.4s linear infinite;
}

@keyframes indeterminate { from { transform: translateX(-100%); } to { transform: translateX(250%); } }

@media (prefers-reduced-motion: reduce) {
  .progress::after { animation: none; width: 100%; opacity: 0.4; }
  .switch input, .switch input::before { transition: none; }
}

/* MD3 basic dialog */
dialog {
  width: min(400px, calc(100vw - 48px));
  padding: 24px;
  border: 0;
  border-radius: 28px;
  background: var(--surface-container);
  color: var(--on-surface);
  box-shadow: var(--elevation-2);
}

dialog::backdrop { background: var(--black-a5); }
dialog:focus-visible { outline: 0; }
dialog h2 { margin: 0 0 16px; font-size: var(--headline); line-height: 28px; font-weight: 400; }
dialog p { margin: 0; color: var(--on-surface-variant); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin: 24px -12px 0 0; }

#snackbar {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 20;
  transform: translateX(-50%);
  max-width: calc(100% - 32px);
  min-height: 48px;
  padding: 14px 16px;
  border-radius: 4px;
  background: var(--on-surface);
  color: var(--surface);
  box-shadow: var(--elevation-2);
}

[hidden] { display: none !important; }

@media (max-width: 839px) {
  .app-bar { padding: 0 16px; }
  .layout { grid-template-columns: minmax(0, 1fr); padding: 0 16px 16px; }
  .pane { position: static; padding: 24px 16px 16px; }
  .placeholder { display: none; }
}

@media (max-width: 599px) {
  .row { gap: 12px; }
  .text-field:has(.field-button) > svg { display: none; }
  .field-button { padding-right: 16px; }
  .filled-button { width: 100%; }
  .switches { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; width: 100%; }
  .segmented button { min-width: 0; }
  .leg header { flex-wrap: wrap; row-gap: 4px; }
  .leg header .meta { flex-basis: 100%; flex-wrap: wrap; row-gap: 4px; margin-left: 0; padding-left: 40px; }
}