:root {
  --bg-top: #f7edd8;
  --bg-bottom: #dce8f0;
  --panel: rgba(255, 250, 243, 0.82);
  --ink: #24343f;
  --muted: #5f6f78;
  --accent: #0f7b78;
  --accent-2: #e67c58;
  --belt: #35576b;
  --belt-glow: rgba(15, 123, 120, 0.2);
  --path: rgba(255, 196, 119, 0.62);
  --crash: rgba(230, 124, 88, 0.3);
  --success: rgba(85, 164, 121, 0.28);
  --shadow: 0 16px 40px rgba(36, 52, 63, 0.14);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Gill Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.75), transparent 30%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.shell {
  width: min(980px, calc(100% - 24px));
  margin: 0 auto;
  padding: 18px 0 32px;
}

.topnav {
  display: flex;
  gap: 10px;
  justify-content: center;
  align-items: center;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.98rem;
}
.topnav a { color: var(--accent); text-decoration: none; }
.topnav a:hover { text-decoration: underline; }

.panel {
  background: var(--panel);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.hero {
  padding: 24px;
  text-align: center;
}
.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  color: var(--accent);
}
.hero h1 {
  margin: 0;
  font-family: "Copperplate", "Trebuchet MS", sans-serif;
  letter-spacing: 0.04em;
}
.subtitle {
  margin: 12px auto 0;
  max-width: 620px;
  line-height: 1.5;
  color: var(--muted);
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 14px 18px;
  margin-top: 14px;
}
.hud div {
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.58);
}
.label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 6px;
}
.hud strong {
  font-size: 1.1rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 16px;
  margin-top: 16px;
}
.board-panel, .side { padding: 18px; }
.legend {
  margin-bottom: 14px;
  line-height: 1.45;
  color: var(--muted);
}

.board {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}
.cell {
  aspect-ratio: 1;
  border: 0;
  border-radius: 18px;
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(232,239,242,0.98));
  box-shadow: inset 0 0 0 1px rgba(53,87,107,0.12);
  padding: 0;
}
.cell.empty { cursor: default; }
.cell.rotatable {
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(53,87,107,0.16), inset 0 0 0 4px var(--belt-glow);
}
.cell.rotatable:hover, .cell.rotatable:focus-visible {
  transform: translateY(-1px);
  box-shadow: inset 0 0 0 1px rgba(53,87,107,0.18), inset 0 0 0 5px rgba(15,123,120,0.28), 0 10px 20px rgba(53,87,107,0.16);
}
.cell.path { background: linear-gradient(180deg, rgba(255,244,221,0.96), rgba(255,229,187,0.96)); }
.cell.crash { background: linear-gradient(180deg, rgba(255,233,226,0.98), rgba(252,213,203,0.98)); }
.cell.success { background: linear-gradient(180deg, rgba(228,248,235,0.96), rgba(205,236,217,0.98)); }

.marker {
  position: absolute;
  top: 8px;
  left: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: rgba(255,255,255,0.92);
  box-shadow: 0 6px 16px rgba(36,52,63,0.12);
}
.marker.start { color: var(--accent); }
.marker.checkpoint { color: var(--accent-2); }
.marker.exit { color: #3d8a4f; }

.arrow {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--belt);
  font-weight: 700;
}
.step {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.76rem;
  background: rgba(255,255,255,0.95);
  color: var(--muted);
}
.pkg {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 6px;
  right: 10px;
  top: 10px;
  background: linear-gradient(180deg, #f1a86b, #d77442);
  box-shadow: 0 4px 10px rgba(215,116,66,0.35);
}

.route-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.route-pill {
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 0.84rem;
  background: rgba(255,255,255,0.72);
}
.route-pill.start { color: var(--accent); }
.route-pill.checkpoint { color: var(--accent-2); }
.route-pill.exit { color: #3d8a4f; }

.message {
  min-height: 108px;
  margin: 0;
  line-height: 1.55;
  color: var(--ink);
}
.controls {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
button {
  border: 0;
  border-radius: 14px;
  padding: 13px 16px;
  font: inherit;
  font-weight: 700;
  background: #edf4f5;
  color: var(--ink);
}
button:hover:not(:disabled), button:focus-visible:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(36,52,63,0.12);
}
#launchBtn { background: linear-gradient(135deg, #1c918d, #116a68); color: white; }
#nextBtn { background: linear-gradient(135deg, #5baf73, #3c8c53); color: white; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

@media (max-width: 820px) {
  .hud, .layout { grid-template-columns: 1fr; }
  .message { min-height: 0; }
}