* { box-sizing: border-box; }
:root {
  --bg: #0b1320;
  --card: #121b2e;
  --text: #e6eefb;
  --muted: #94a3b8;
  --accent: #4f8cff;
  --grid: rgba(255,255,255,0.06);
  --snake: #7cf67c;
  --snake-head: #a9ff5b;
  --food: #ff5757;
}

html, body {
  height: 100%;
  margin: 0;
  background: radial-gradient(100% 100% at 50% 0%, #0b1320 0%, #09101e 100%);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

.topbar {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar h1 { margin: 0; font-size: 1.4rem; letter-spacing: .5px; }
.stats { display: flex; gap: 16px; color: var(--muted); }

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 20px 32px;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.btn {
  background: var(--accent);
  color: white;
  border: 0;
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(79,140,255,.2);
}
.btn:active { transform: translateY(1px); }

.control { color: var(--muted); font-size: .95rem; display: inline-flex; gap: 8px; align-items: center; }

.stage-wrap {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 16px;
  padding: 18px;
  position: relative;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 40px rgba(0,0,0,.35);
}

canvas#game {
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1/1;
  background: repeating-linear-gradient(0deg, transparent, transparent 24px, var(--grid) 24px, var(--grid) 25px),
              repeating-linear-gradient(90deg, transparent, transparent 24px, var(--grid) 24px, var(--grid) 25px);
  border-radius: 12px;
}

.overlay {
  position: absolute; inset: 18px;
  display: grid; place-items: center;
  background: rgba(0,0,0,.35);
  border-radius: 12px;
  opacity: 1; pointer-events: auto;
  transition: opacity .2s ease;
}
.overlay.hidden { opacity: 0; pointer-events: none; }

.overlay-content {
  background: rgba(18,27,46,.85);
  padding: 20px 24px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  text-align: center;
  color: var(--muted);
}

.dpad {
  display: grid;
  gap: 6px;
  place-items: center;
  position: absolute;
  right: 20px; bottom: 20px;
  user-select: none;
}
.dpad .middle { display: grid; grid-template-columns: auto auto; gap: 6px; }
.d {
  width: 44px; height: 44px;
  border-radius: 10px; border: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.06);
  color: var(--text); font-size: 20px;
  display: grid; place-items: center;
}
.d:active { background: rgba(255,255,255,.12); }

.footer {
  max-width: 900px;
  margin: 8px auto 24px;
  padding: 0 20px;
  color: var(--muted);
  font-size: .9rem;
  text-align: center;
}

/* Mobile-friendly input: avoid page scrolling while swiping on the canvas */
:where(canvas, .d) { touch-action: none; }