:root {
  --bg: #08111f;
  --surface: #0d1a2e;
  --grid: #13233d;
  --text: #e5eefc;
  --muted: #9eb1d6;
  --accent: #f97316;
  --snake: #22c55e;
  --food: #fb7185;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #12284d 0%, var(--bg) 50%, #050a14 100%);
  min-height: 100vh;
}
.container { max-width: 520px; margin: 0 auto; padding: 20px; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.topbar a { color: var(--accent); text-decoration: none; font-weight: 700; }
.topbar h1 { margin: 0; font-size: 2rem; }
.hud {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  background: var(--surface);
  border-radius: 10px;
  padding: 10px;
  margin-bottom: 12px;
  border: 1px solid #1f3357;
}
.hud p { margin: 0; color: var(--muted); }
#startBtn {
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
}
canvas {
  width: 100%;
  height: auto;
  background: var(--grid);
  border-radius: 12px;
  border: 1px solid #1f3357;
}
.status { color: var(--muted); margin-top: 10px; }
@media (max-width: 520px) {
  .hud { grid-template-columns: 1fr 1fr; }
  #startBtn { grid-column: span 2; }
}