:root {
  --ink: #202531;
  --muted: #6f7787;
  --paper: #f7f3e8;
  --card: #fffdf8;
  --line: #2e6fca;
  --line-soft: #d8e8ff;
  --transfer: #e8914a;
  --transfer-soft: #ffe6cf;
  --good: #60b889;
  --good-soft: #ddf3e7;
  --bad: #d96969;
  --bad-soft: #f8dfdf;
  --shadow: rgba(20, 25, 35, 0.16);
  --stroke: 3px;
}

*, *::before, *::after { box-sizing: border-box; }

html { min-height: 100%; background: var(--paper); }

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  font-family: ui-rounded, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(46, 111, 202, .10), transparent 34rem),
    linear-gradient(180deg, #faf7ee, var(--paper));
}

button, input { font: inherit; }

.app {
  width: min(100%, 720px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: clamp(1rem, 5vw, 2rem);
  display: grid;
  align-content: start;
  gap: 1rem;
}

.panel {
  border: var(--stroke) solid var(--ink);
  border-radius: 28px;
  background: var(--card);
  box-shadow: 0 12px 28px var(--shadow);
}

.sound-toggle {
  justify-self: end;
  min-height: 44px;
  padding: .45rem .8rem;
  border-radius: 999px;
  font-size: .78rem;
  letter-spacing: .09em;
}

.setup-card { padding: .85rem; }

.route-form { display: grid; gap: 1rem; align-items: start; }

.field {
  display: grid;
  gap: .5rem;
  padding: .75rem;
  border: var(--stroke) solid var(--ink);
  border-radius: 20px;
  background: #f0eadc;
  min-width: 0;
}

.field.has-suggestions { padding-bottom: .9rem; }

.field span {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .13em;
}

.field input {
  width: 100%;
  min-height: 52px;
  border: 0;
  outline: 0;
  border-radius: 14px;
  background: var(--card);
  color: var(--ink);
  font-size: clamp(1.05rem, 4.5vw, 1.35rem);
  font-weight: 850;
  padding: .55rem .7rem;
}

.field:focus-within { background: var(--line-soft); }

.field input.invalid {
  background: var(--bad-soft);
  box-shadow: inset 0 0 0 var(--stroke) var(--bad);
}

.field input.invalid:focus { box-shadow: inset 0 0 0 var(--stroke) var(--bad); }

.suggestions {
  display: none;
  overflow: hidden;
  border: var(--stroke) solid var(--ink);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 6px 0 rgba(32, 37, 49, .16);
}

.suggestions.open { display: grid; }

.suggestion-option {
  width: 100%;
  min-height: 46px;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: var(--card);
  padding: .65rem .75rem;
  color: var(--ink);
  text-align: left;
  font-size: 1rem;
  font-weight: 850;
  letter-spacing: 0;
}

.suggestion-option + .suggestion-option { border-top: 2px solid #e6dece; }

.suggestion-option:hover,
.suggestion-option.active { background: var(--line-soft); }

.suggestion-option:active { transform: none; box-shadow: none; }

.actions { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }

button {
  min-height: 58px;
  border: var(--stroke) solid var(--ink);
  border-radius: 18px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 950;
  letter-spacing: .08em;
  box-shadow: 0 6px 0 rgba(32, 37, 49, .24);
}

button:active { transform: translateY(4px); box-shadow: 0 2px 0 rgba(32, 37, 49, .24); }
button:hover { background: #f3f7ff; }

.game-board { display: grid; gap: 1rem; }

.trip-card { padding: 1rem; }

.diagram {
  display: grid;
  justify-items: center;
  gap: .35rem;
  padding: .3rem 0 .55rem;
}

.node {
  width: 100%;
  min-height: 64px;
  display: grid;
  place-items: center;
  border: var(--stroke) solid var(--ink);
  border-radius: 22px;
  background: var(--card);
  text-align: center;
  font-size: clamp(1.2rem, 6vw, 2.1rem);
  font-weight: 950;
  line-height: 1.05;
  padding: .75rem;
  text-transform: uppercase;
}

.connector {
  width: 8px;
  height: 42px;
  border-radius: 99px;
  background: var(--ink);
  position: relative;
}

.connector::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 18px;
  height: 18px;
  border-right: 8px solid var(--ink);
  border-bottom: 8px solid var(--ink);
  transform: translateX(-50%) rotate(45deg);
  border-radius: 2px;
}

.choice-grid { display: grid; gap: .75rem; }

.choice {
  min-height: 76px;
  padding: .85rem;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: .75rem;
  text-align: left;
  letter-spacing: 0;
  background: var(--card);
}

.choice-label {
  min-width: 56px;
  min-height: 42px;
  display: grid;
  place-items: center;
  border: var(--stroke) solid var(--ink);
  border-radius: 999px;
  background: var(--line-soft);
  font-weight: 950;
}

.choice-route { display: grid; gap: .25rem; font-size: clamp(1.05rem, 4vw, 1.35rem); font-weight: 950; }
.choice small { color: var(--muted); font-size: .74rem; font-weight: 950; letter-spacing: .11em; }
.choice.correct { background: var(--good-soft); border-color: var(--good); }
.choice.correct .choice-label { background: var(--good-soft); border-color: var(--good); }
.choice.wrong { background: var(--bad-soft); border-color: var(--bad); }
.choice.wrong .choice-label { background: var(--bad-soft); border-color: var(--bad); }
.choice:disabled { cursor: default; opacity: 1; }

.reveal { padding: 1rem; display: grid; gap: .75rem; }
.reveal.good { background: var(--good-soft); }
.reveal.bad, .reveal.none { background: var(--bad-soft); }

.answer-list { display: grid; gap: .55rem; }
.answer {
  display: grid;
  gap: .25rem;
  padding: .75rem;
  border: var(--stroke) solid var(--ink);
  border-radius: 18px;
  background: var(--card);
  font-weight: 950;
}
.answer small { color: var(--muted); font-size: .72rem; letter-spacing: .12em; }

.next-row { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.hidden { display: none; }

@media (min-width: 640px) {
  .route-form { grid-template-columns: 1fr 1fr; }
  .actions { grid-column: 1 / -1; }
}