:root {
  --bg: #0b0f17;
  --panel: #0f1522;
  --text: #e6ebf3;
  --muted: #a6b0c2;
  --brand: #5cf2d6;
  --border: #1e2635;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial; background: linear-gradient(180deg, #0b0f17 0%, #0c111b 100%); color: var(--text); }

.topbar { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--border); background: color-mix(in hsl, var(--bg) 80%, transparent); position: sticky; top: 0; }
.topbar h1 { margin: 0; font-size: 18px; font-weight: 600; }
.back { text-decoration: none; color: var(--text); opacity: .9; border: 1px solid var(--border); padding: 6px 10px; border-radius: 8px; }
.spacer { flex: 1; }

.wrap { min-height: calc(100% - 56px); display: grid; place-items: center; padding: 20px; }
.panel { width: min(540px, 100%); background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 16px; box-shadow: 0 20px 60px rgba(0,0,0,.4); display: grid; gap: 12px; justify-items: center; }

.hud { width: 100%; display: flex; justify-content: space-between; align-items: center; color: var(--muted); }
.score { font-weight: 600; color: var(--text); }
.status { font-size: 14px; }

canvas { width: 100%; height: auto; background: #0b1220; border: 1px solid var(--border); border-radius: 12px; image-rendering: pixelated; }

.controls { display: flex; gap: 8px; }
.btn { display: inline-block; padding: 10px 14px; border-radius: 10px; text-decoration: none; font-weight: 600; border: 1px solid var(--border); color: var(--text); background: transparent; cursor: pointer; }
.btn.primary { background: var(--brand); color: #0b0f17; border-color: transparent; }
.btn[disabled] { opacity: .6; cursor: not-allowed; }

.dpad { display: grid; gap: 6px; place-items: center; margin-top: 6px; }
.dpad .row { display: grid; grid-template-columns: repeat(3, 46px); gap: 6px; }
.dpad > button { display: none; }
.dpad button { width: 46px; height: 46px; border-radius: 10px; background: #0b1220; color: var(--text); border: 1px solid var(--border); cursor: pointer; }

@media (max-width: 640px) {
  .dpad > button { display: block; }
}

.help { color: var(--muted); font-size: 12px; margin: 2px 0 0; }