:root {
  --bg: #eef3f7;
  --card: #ffffff;
  --ink: #10222f;
  --muted: #4b6271;
  --accent: #0f5a7a;
  --ok: #117a37;
  --bad: #b0382a;
  --line: #d4dfe7;
  --mbta-red: #da291c;
  --mbta-orange: #ed8b00;
  --mbta-green: #00843d;
  --mbta-rail: #7b4d9e;
  --mbta-walk: #607d8b;
  --bg-tone-a: #dff4ff;
  --bg-tone-b: #fff5de;
  --bg-wash: #eef3f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, var(--bg-tone-a) 0%, transparent 35%),
    radial-gradient(circle at 90% 0%, var(--bg-tone-b) 0%, transparent 30%),
    var(--bg-wash);
  transition: background 260ms ease;
}

.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.2rem;
}

body.route-green {
  --bg-tone-a: #d7f8e8;
  --bg-tone-b: #eefbf3;
  --bg-wash: #edf8f1;
}

body.route-orange {
  --bg-tone-a: #ffe9c7;
  --bg-tone-b: #fff5e5;
  --bg-wash: #fff6ea;
}

body.route-walk {
  --bg-tone-a: #e1edf6;
  --bg-tone-b: #f1f7fc;
  --bg-wash: #edf3f8;
}

header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.02em;
}

header p {
  margin: 0.3rem 0 0;
  color: var(--muted);
}

.brand-row {
  display: flex;
  gap: 0.8rem;
  align-items: center;
}

.mbta-logo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 2px #d8e2ea, 0 8px 24px rgba(12, 36, 54, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mbta-logo svg {
  width: 48px;
  height: 48px;
}

.mbta-logo circle {
  fill: #000;
}

.mbta-logo rect {
  fill: #fff;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  margin-top: 1rem;
  box-shadow: 0 5px 20px rgba(10, 35, 55, 0.05);
}

.settings {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.settings h2 {
  grid-column: 1 / -1;
}

label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.95rem;
}

input,
select,
button {
  font: inherit;
  padding: 0.5rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
}

button {
  width: fit-content;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  cursor: pointer;
  grid-column: 1 / -1;
}

.hidden {
  display: none;
}

.error {
  color: var(--bad);
  font-weight: 700;
}

.summary-grid {
  display: grid;
  gap: 0.2rem;
  margin-top: 0.75rem;
}

.summary-grid p {
  margin: 0;
  color: var(--muted);
}

.decision-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.decision-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem;
  background: linear-gradient(145deg, #ffffff, #f2f8fc);
}

.decision-label {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.decision-value {
  margin: 0.35rem 0 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: #0c3145;
}

#transfer-branch.orange {
  color: var(--mbta-orange);
}

#transfer-branch.green {
  color: var(--mbta-green);
}

#transfer-branch.walk {
  color: var(--mbta-walk);
}

.legend {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.badge.red {
  background: var(--mbta-red);
}

.badge.orange {
  background: var(--mbta-orange);
}

.badge.green {
  background: var(--mbta-green);
}

.badge.rail {
  background: var(--mbta-rail);
}

.badge.walk {
  background: var(--mbta-walk);
}

.trip-strip,
.route-timeline {
  display: grid;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.trip-strip {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem;
  background: #fbfdff;
}

.map-ribbon {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
}

.map-step {
  min-width: 110px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.35rem 0.4rem 0.45rem;
  background: #fff;
}

.map-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin: 0 auto 0.3rem;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px currentColor;
}

.map-step.red,
.map-link.red {
  color: var(--mbta-red);
}

.map-step.orange,
.map-link.orange {
  color: var(--mbta-orange);
}

.map-step.green,
.map-link.green {
  color: var(--mbta-green);
}

.map-step.rail,
.map-link.rail {
  color: var(--mbta-rail);
}

.map-step.walk,
.map-link.walk {
  color: var(--mbta-walk);
}

.map-step.red {
  background: linear-gradient(180deg, #fff 0%, #fff2f1 100%);
}

.map-step.orange {
  background: linear-gradient(180deg, #fff 0%, #fff5e8 100%);
}

.map-step.green {
  background: linear-gradient(180deg, #fff 0%, #ecfbf3 100%);
}

.map-step.rail {
  background: linear-gradient(180deg, #fff 0%, #f5eefb 100%);
}

.map-step.walk {
  background: linear-gradient(180deg, #fff 0%, #f0f6fb 100%);
}

.map-link {
  min-width: 40px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  opacity: 0.9;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.map-stop {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.map-time {
  margin: 0.1rem 0 0;
  font-weight: 800;
  font-size: 0.9rem;
}

.segment {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 0.65rem;
}

.segment-time {
  font-weight: 700;
  color: #17394a;
}

.segment-visual {
  position: relative;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-radius: 10px;
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 0.38rem 0.65rem;
  overflow: hidden;
}

.segment-visual::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
}

.segment.red .segment-visual::before {
  background: var(--mbta-red);
}

.segment.orange .segment-visual::before {
  background: var(--mbta-orange);
}

.segment.green .segment-visual::before {
  background: var(--mbta-green);
}

.segment.rail .segment-visual::before {
  background: var(--mbta-rail);
}

.segment.walk .segment-visual::before {
  background: var(--mbta-walk);
}

.segment-label {
  font-size: 0.93rem;
}

.route-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.route-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
  background: #fcfdff;
}

.route-card h3 {
  margin: 0;
  font-size: 1rem;
}

.route-meta {
  color: var(--muted);
  margin: 0.25rem 0 0.35rem;
  font-size: 0.88rem;
}

.route-result {
  margin: 0.25rem 0 0;
  font-weight: 700;
}

.route-result.ok {
  color: var(--ok);
}

.route-result.bad {
  color: var(--bad);
}

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

  .decision-board {
    grid-template-columns: 1fr;
  }

  .route-cards {
    grid-template-columns: 1fr;
  }

  .segment {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}