:root {
  --pave: #E9EDEF;
  --card: #F7F9FA;
  --ink: #14202B;
  --ink-2: #4A5966;
  --line: #CDD6DC;

  --lane: #2457F5;
  --signal: #FFB020;
  --moss: #1F7A5C;
  --bad: #C2352B;

  --r-s: 8px;
  --r-m: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --pave: #0E161D;
    --card: #16212A;
    --ink: #E8EEF2;
    --ink-2: #9AAAB6;
    --line: #2A3945;
    --lane: #6E92FF;
    --moss: #4FC49B;
    --bad: #FF7A6E;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--pave);
  color: var(--ink);
  font: 400 16px/1.5 "Instrument Sans", system-ui, sans-serif;
}

h1,
h2,
legend {
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  margin: 0;
}

:focus-visible {
  outline: 3px solid var(--lane);
  outline-offset: 2px;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px clamp(16px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 700 18px "Bricolage Grotesque", sans-serif;
}

.api {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-2);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #9AA7B0;
}

.dot.ok {
  background: var(--moss);
}

.dot.down {
  background: var(--bad);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(20px, 3vw, 44px);
  padding: clamp(20px, 4vw, 44px) clamp(16px, 4vw, 48px);
  max-width: 1280px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.intro h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.intro p {
  color: var(--ink-2);
  margin: 10px 0 16px;
  max-width: 52ch;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  font-size: 14px;
  color: var(--ink-2);
}

.chip {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  transition: border-color 0.15s, background 0.15s;
}

.chip:hover {
  border-color: var(--lane);
}

fieldset {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: var(--r-m);
  padding: 18px 20px 20px;
  margin: 0 0 16px;
}

legend {
  font-size: 18px;
  padding: 0 8px;
  margin-left: -8px;
}

.grid.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
}

@media (max-width: 520px) {
  .grid.two {
    grid-template-columns: 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 2px;
}

fieldset .field + .field {
  margin-top: 12px;
}

.grid .field + .field {
  margin-top: 0;
}

label,
.label {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
}

label small {
  font-weight: 400;
}

output {
  color: var(--ink);
  font-weight: 600;
  margin-left: 4px;
}

input[type="number"],
input[type="time"],
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-s);
  background: var(--pave);
  color: var(--ink);
  font: inherit;
  min-height: 44px;
}

input:invalid.touched,
input.bad {
  border-color: var(--bad);
}

.err {
  color: var(--bad);
  font-size: 13px;
  min-height: 0;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--lane);
  min-height: 44px;
}

.route-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
  font-size: 14px;
  color: var(--ink-2);
}

.btn-small {
  padding: 8px 14px;
  border-radius: var(--r-s);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--pave);
  cursor: pointer;
  font: 500 14px inherit;
}

.btn-small.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-small.ghost:hover {
  border-color: var(--lane);
}

.seg {
  display: flex;
  border: 1px solid var(--line);
  border-radius: var(--r-s);
  overflow: hidden;
  background: var(--pave);
}

.seg.wrap {
  flex-wrap: wrap;
}

.seg label {
  flex: 1;
  min-width: 76px;
  cursor: pointer;
  margin: 0;
}

.seg input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.seg span {
  display: block;
  text-align: center;
  padding: 10px 8px;
  color: var(--ink);
  font-weight: 500;
  border-right: 1px solid var(--line);
  transition: background 0.15s, color 0.15s;
}

.seg label:last-child span {
  border-right: 0;
}

.seg input:checked + span {
  background: var(--ink);
  color: var(--pave);
}

.seg input:focus-visible + span {
  outline: 3px solid var(--lane);
  outline-offset: -3px;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  color: var(--ink);
  font-size: 16px;
  margin-top: 14px;
}

.switch input {
  position: absolute;
  opacity: 0;
}

.track {
  width: 46px;
  height: 26px;
  border-radius: 999px;
  background: var(--line);
  position: relative;
  transition: background 0.2s;
}

.track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}

.switch input:checked + .track {
  background: var(--signal);
}

.switch input:checked + .track::after {
  transform: translateX(20px);
}

.submit {
  width: 100%;
  padding: 16px;
  border: 0;
  border-radius: var(--r-m);
  background: var(--lane);
  color: #fff;
  font: 600 17px "Bricolage Grotesque", sans-serif;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  transition: transform 0.1s, filter 0.15s;
}

.submit:hover {
  filter: brightness(1.08);
}

.submit:active {
  transform: scale(0.99);
}

.submit:disabled {
  opacity: 0.7;
  cursor: progress;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 3px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  display: none;
  animation: spin 0.7s linear infinite;
}

.submit.loading .spinner {
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.form-error {
  margin: 12px 0 0;
  padding: 12px 14px;
  border-radius: var(--r-s);
  border: 1px solid var(--bad);
  color: var(--bad);
  font-size: 14px;
}

.form-error[hidden] {
  display: none;
}

.result {
  position: sticky;
  top: 20px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (max-width: 900px) {
  .result {
    position: static;
  }
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  padding: 20px;
}

.empty {
  text-align: center;
  color: var(--ink-2);
  padding: 8px 0 4px;
}

.empty-title {
  font: 700 20px "Bricolage Grotesque", sans-serif;
  color: var(--ink);
  margin: 0 0 4px;
}

.empty p {
  margin: 0;
}

.eta {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  margin-top: 6px;
}

.eta #etaNum {
  font: 700 clamp(64px, 10vw, 96px)/1 "Bricolage Grotesque", sans-serif;
  letter-spacing: -0.04em;
}

.eta .unit {
  font: 500 22px "Bricolage Grotesque", sans-serif;
  color: var(--ink-2);
}

.eta-note {
  text-align: center;
  color: var(--ink-2);
  margin: 4px 0 18px;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0;
}

.facts div {
  background: var(--pave);
  border-radius: var(--r-s);
  padding: 10px 12px;
}

.facts dt {
  font-size: 13px;
  color: var(--ink-2);
}

.facts dd {
  margin: 2px 0 0;
  font: 600 18px "Bricolage Grotesque", sans-serif;
}

.meter {
  height: 8px;
  border-radius: 99px;
  background: var(--line);
  margin-top: 18px;
  overflow: hidden;
}

.meter span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 99px;
  background: var(--moss);
  transition: width 0.8s, background 0.3s;
}

.meter-scale {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--ink-2);
  margin-top: 4px;
}

#output[hidden],
#empty[hidden] {
  display: none;
}

.history-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.history h2 {
  font-size: 18px;
}

.history ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.history li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.history li:first-child {
  border-top: 0;
}

.history li b {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 16px;
}

.muted {
  color: var(--ink-2);
}

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