:root {
  --bg: #07111d;
  --panel: #0f1f34;
  --line: #57c4ff;
  --line-dim: #2f6d93;
  --text: #e3f3ff;
  --accent: #ffd057;
  --disk: #ff6b98;
  --exit: #63f4ae;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Verdana", system-ui, sans-serif;
  background:
    radial-gradient(circle at 20% 10%, #153052, transparent 55%),
    radial-gradient(circle at 80% 0%, #112842, transparent 45%),
    var(--bg);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 24px 12px;
}

.app {
  width: min(920px, 100%);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid #2c4f72;
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

.topbar h1 {
  margin: 8px 0 6px;
  font-size: clamp(1.4rem, 3.3vw, 2rem);
  letter-spacing: 0.04em;
}

.topbar p { margin: 0 0 14px; color: #b7dfff; }

.back {
  display: inline-block;
  color: var(--line);
  text-decoration: none;
  font-size: 0.95rem;
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(90px, 1fr));
  gap: 8px;
  margin-bottom: 14px;
}

.hud div {
  background: var(--panel);
  border: 1px solid #2d5174;
  border-radius: 10px;
  padding: 8px 10px;
}

.hud span {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #8eb8d8;
  display: block;
}

.hud strong {
  font-size: 1.08rem;
  margin-top: 2px;
  display: block;
}

.arena-wrap {
  background: #050d18;
  border: 1px solid #274261;
  border-radius: 12px;
  padding: 14px;
}

.maze {
  --cols: 10;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(20px, 1fr));
  gap: 0;
  width: 100%;
}

.cell {
  position: relative;
  aspect-ratio: 1;
  min-width: 0;
  background: rgba(14, 28, 44, 0.55);
}

.wall-n { border-top: 2px solid var(--line); }
.wall-e { border-right: 2px solid var(--line); }
.wall-s { border-bottom: 2px solid var(--line); }
.wall-w { border-left: 2px solid var(--line); }

.cell::after {
  content: "";
  position: absolute;
  inset: 26%;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.4);
  transition: 140ms ease;
}

.cell.player::after {
  opacity: 1;
  transform: scale(1);
  background: var(--accent);
  box-shadow: 0 0 12px rgba(255, 208, 87, 0.8);
}

.cell.disk::before {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: 5px;
  background: var(--disk);
  box-shadow: 0 0 10px rgba(255, 107, 152, 0.7);
}

.cell.exit {
  background:
    linear-gradient(45deg, rgba(99, 244, 174, 0.18), rgba(99, 244, 174, 0.05)),
    rgba(10, 30, 24, 0.8);
}

.cell.exit::before {
  content: "";
  position: absolute;
  inset: 18%;
  border: 2px dashed var(--exit);
  border-radius: 8px;
}

.legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
  color: #abd8f5;
  font-size: 0.9rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.chip {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.player-chip { background: var(--accent); }
.disk-chip { background: var(--disk); }
.exit-chip { background: var(--exit); }

.controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 10px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  color: #03101f;
  font-weight: 700;
  cursor: pointer;
}

.primary { background: var(--accent); }
.ghost {
  background: #1c3149;
  color: var(--text);
  border: 1px solid #3b5b7b;
}

.status {
  border: 1px solid #2b4b6c;
  border-radius: 10px;
  padding: 10px 12px;
  color: #c4e3fb;
  background: rgba(10, 28, 42, 0.5);
}

@media (max-width: 700px) {
  .hud { grid-template-columns: repeat(2, minmax(100px, 1fr)); }
}