:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --line: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #34d399;
  --accent-dark: #059669;
  --food: #fb7185;
  --board-max: 480px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

body { min-height: 100dvh; }

.app {
  width: min(100%, var(--board-max));
  margin: 0 auto;
  padding: 16px 16px calc(24px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.scores { display: flex; gap: 10px; }

.score {
  min-width: 72px;
  padding: 6px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  text-align: center;
  line-height: 1.15;
}

.score .label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.score .value {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.board-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(3px);
}

.overlay[hidden] { display: none; }

.overlay-title {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.overlay-text {
  margin: 0 0 8px;
  color: var(--muted);
  max-width: 28ch;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.btn:hover { border-color: var(--muted); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, .pad:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #052e1c;
  padding: 12px 28px;
  font-size: 1.05rem;
}

.btn.primary:hover { background: #6ee7b7; }

.controls {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 64px);
  grid-template-rows: repeat(3, 64px);
  gap: 6px;
  justify-content: center;
  margin: 4px auto 0;
}

.pad {
  font-size: 1.3rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.pad:active { background: var(--line); }
.pad.up { grid-column: 2; grid-row: 1; }
.pad.left { grid-column: 1; grid-row: 2; }
.pad.right { grid-column: 3; grid-row: 2; }
.pad.down { grid-column: 2; grid-row: 3; }

@media (hover: hover) and (pointer: fine) {
  .dpad { display: none; }
}

.help {
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.help h2 {
  margin: 0 0 6px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text);
}

.help ul { margin: 0; padding-left: 18px; }
.help li + li { margin-top: 4px; }

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8em;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--bg);
  color: var(--text);
}

.foot {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

.foot a { color: var(--accent); text-decoration: none; }
.foot a:hover { text-decoration: underline; }

@media (max-width: 380px) {
  h1 { font-size: 1.6rem; }
  .score { min-width: 60px; padding: 5px 8px; }
  .dpad { grid-template-columns: repeat(3, 56px); grid-template-rows: repeat(3, 56px); }
}