:root {
  color-scheme: dark;
  --bg: #07090f;
  --panel: #111827;
  --panel-2: #172033;
  --text: #ecfdf5;
  --muted: #8ea3b8;
  --line: rgba(255, 255, 255, 0.12);
  --snake: #34d399;
  --snake-head: #a7f3d0;
  --food: #fb7185;
  --accent: #38bdf8;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body { overscroll-behavior: none; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 10%, rgba(56, 189, 248, 0.16), transparent 30rem),
    radial-gradient(circle at 80% 90%, rgba(52, 211, 153, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

button { font: inherit; }

.app {
  width: min(100%, 760px);
  display: grid;
  gap: 16px;
}

.header,
.scoreboard,
.game-card,
.controls,
.touch-pad {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(23, 32, 51, 0.94), rgba(9, 13, 23, 0.96));
  box-shadow: var(--shadow);
}

.header { padding: 24px; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 9vw, 76px);
  line-height: 0.95;
}

.hint {
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
}

.scoreboard div {
  padding: 16px;
  background: rgba(255, 255, 255, 0.035);
}

.scoreboard span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
}

.scoreboard strong {
  font-size: 26px;
}

.game-card {
  position: relative;
  padding: 16px;
  touch-action: none;
}

canvas {
  width: 100%;
  display: block;
  border-radius: 18px;
  background: #08111d;
  image-rendering: pixelated;
}

.overlay {
  position: absolute;
  inset: 16px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  border-radius: 18px;
  background: rgba(7, 9, 15, 0.72);
  text-align: center;
  opacity: 1;
  pointer-events: none;
  transition: opacity 160ms ease;
}

.overlay.hidden { opacity: 0; }

.overlay strong { font-size: clamp(28px, 7vw, 54px); }
.overlay span { color: var(--muted); }

.controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 14px;
}

.controls button,
.touch-pad button {
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
}

.controls .primary {
  border: 0;
  background: linear-gradient(135deg, var(--snake), var(--accent));
  color: #021018;
}

.touch-pad {
  display: none;
  padding: 14px;
  gap: 10px;
  justify-items: center;
}

.touch-pad div {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.touch-pad > button { width: 33%; }

@media (max-width: 640px) {
  body { padding: 14px; }
  .scoreboard { grid-template-columns: 1fr; }
  .controls { grid-template-columns: 1fr; }
  .touch-pad { display: grid; }
}