:root {
  --asphalt: #3a3f46;
  --asphalt-edge: #2a2e34;
  --lane: #d7dde5;
  --grass: #6f8f62;
  --grass-deep: #54734a;
  --mark: #f2f4f7;
  --car-a: #c45c26;
  --car-b: #2f6fed;
  --car-c: #2f9e6b;
  --car-d: #8a4bb3;
  --panel: #f7f1e8;
  --ink: #1d1a16;
  --muted: #5c564c;
  --accent: #b84a1b;
  --ok: #1f7a4c;
  --bad: #a32020;
  --path: rgba(255, 255, 255, 0.55);
  --shadow: rgba(20, 16, 10, 0.18);
  --display: "Fraunces", "Source Serif 4", Georgia, serif;
  --body: "Source Sans 3", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 20% 10%, rgba(255, 255, 255, 0.35), transparent 40%),
    linear-gradient(160deg, #d9e2d1 0%, #c7d3c0 45%, #b7c6b4 100%);
  color: var(--ink);
  font-family: var(--body);
}

body {
  min-height: 100vh;
}

.app {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 2rem;
  display: grid;
  gap: 0.9rem;
}

.top {
  display: grid;
  gap: 0.35rem;
}

.brand-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.lang {
  margin-left: auto;
  display: flex;
  gap: 0.2rem;
}

.lang button {
  padding: 0.35rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 0.45rem;
}

.lang button:hover {
  transform: none;
  color: var(--ink);
}

.lang button[aria-pressed="true"] {
  background: #efe6d8;
  color: var(--ink);
  border-color: rgba(40, 30, 20, 0.12);
}

.brand {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
  line-height: 1;
}

.version {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 42rem;
}

.play {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 11.5rem;
  gap: 0.9rem;
  align-items: start;
}

.stage-wrap {
  background: linear-gradient(180deg, #8ea882 0%, var(--grass) 55%, var(--grass-deep) 100%);
  border-radius: 1.1rem;
  box-shadow: 0 18px 40px var(--shadow);
  overflow: hidden;
  border: 1px solid rgba(40, 50, 30, 0.18);
  min-width: 0;
}

.stage {
  width: 100%;
  height: auto;
  display: block;
  touch-action: none;
}

.road {
  fill: var(--asphalt);
  stroke: var(--asphalt-edge);
  stroke-width: 3;
}

.lane-dash {
  stroke: var(--lane);
  stroke-width: 3;
  stroke-dasharray: 14 12;
  opacity: 0.85;
}

.stop-line {
  stroke: var(--mark);
  stroke-width: 5;
  stroke-linecap: square;
}

.ghost-path {
  fill: none;
  stroke: rgba(255, 255, 255, 0.35);
  stroke-width: 4;
  stroke-dasharray: 10 10;
  stroke-linecap: round;
  pointer-events: none;
}

.ghost-path.is-active {
  stroke: rgba(255, 244, 200, 0.75);
  stroke-width: 5;
  stroke-dasharray: 12 8;
}

.car-hold-shadow {
  pointer-events: none;
}

.hold-shadow-area {
  fill: rgba(180, 36, 28, 0.55);
}

.car {
  cursor: grab;
  transform-box: fill-box;
  transform-origin: center;
}

.car-visual,
.hold-shadow-visual {
  transform-box: fill-box;
  transform-origin: center;
}

.car.is-dragging {
  cursor: grabbing;
  filter: brightness(1.05);
}

.car.is-finished {
  cursor: default;
}

.car-body {
  stroke: rgba(0, 0, 0, 0.35);
  stroke-width: 1.5;
}

.car[data-car-id="A"] .car-body {
  fill: var(--car-a);
}

.car[data-car-id="B"] .car-body {
  fill: var(--car-b);
}

.car[data-car-id="C"] .car-body {
  fill: var(--car-c);
}

.car[data-car-id="D"] .car-body {
  fill: var(--car-d);
}

.car-nose {
  fill: rgba(255, 255, 255, 0.35);
}

.indicator {
  opacity: 0;
  pointer-events: none;
}

.indicator-glow {
  fill: #ff9a00;
  opacity: 0.55;
}

.indicator-arrow {
  fill: #ffe566;
  stroke: #fff8c8;
  stroke-width: 2;
  stroke-linejoin: round;
}

.indicator.is-on {
  animation: blink 0.55s steps(1) infinite;
  filter: drop-shadow(0 0 6px #ffb000) drop-shadow(0 0 12px #ff7a00);
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0.2;
  }
}

.order-badge {
  fill: #1d1a16;
  font-family: var(--body);
  font-size: 14px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.order-badge-bg {
  fill: #fff7ea;
  stroke: rgba(0, 0, 0, 0.25);
  stroke-width: 1;
}

.control {
  pointer-events: none;
}

.hud {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: stretch;
}

.hud button {
  width: 100%;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.35;
}

button {
  appearance: none;
  border: 0;
  border-radius: 0.7rem;
  padding: 0.7rem 1rem;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  background: var(--ink);
  color: #f7f1e8;
  transition: transform 120ms ease, opacity 120ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

button.secondary {
  background: #efe6d8;
  color: var(--ink);
  border: 1px solid rgba(40, 30, 20, 0.12);
}

button.accent {
  background: var(--accent);
}

button.seed {
  font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.feedback {
  background: var(--panel);
  border-radius: 0.9rem;
  padding: 0.95rem 1.05rem;
  border: 1px solid rgba(40, 30, 20, 0.1);
  box-shadow: 0 10px 24px var(--shadow);
  display: none;
}

.feedback.is-visible {
  display: grid;
  gap: 0.55rem;
}

.feedback h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.35rem;
}

.feedback.is-correct h2 {
  color: var(--ok);
}

.feedback.is-wrong h2 {
  color: var(--bad);
}

.feedback ul {
  margin: 0;
  padding-left: 1.15rem;
}

.feedback li {
  margin: 0.2rem 0;
}

.order-line {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 720px) {
  .app {
    width: min(100% - 1rem, 1120px);
  }

  .play {
    grid-template-columns: 1fr;
  }

  .hud {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .hud button {
    width: auto;
  }

  .meta {
    width: 100%;
  }

  .car-visual,
  .hold-shadow-visual {
    transform: scale(1.5);
  }
}