:root{
  --bg: #0f1113;
  --card: linear-gradient(135deg,#0f1720 0%, #111827 100%);
  --accent: #00d4ff;
  --muted: #9aa3ad;
}

*{box-sizing:border-box}
html,body{height:100%}
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(0,212,255,0.04), transparent),
              linear-gradient(180deg, #060708 0%, #0b0c0f 100%);
  color: #e6eef6;
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 24px;
}

.container{
  width: 100%;
  max-width: 940px;
  text-align:center;
  padding-top: 40px;
}

.canvas-wrap{
  background: rgba(255,255,255,0.02);
  padding: 14px;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.02);
  display:inline-block;
}

canvas{
  display:block;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius: 8px;
  width: 100%;
  max-width: 800px;
  height: 440px;
  outline: 3px solid rgba(255,255,255,0.03);
  box-shadow: 0 8px 30px rgba(0,0,0,0.7);
}

/* HUD */
.hud{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  margin: 12px 0;
}

.score{
  font-size: 36px;
  font-weight:600;
  color: var(--accent);
  min-width:64px;
}

/* controls */
.controls button{
  background: transparent;
  border: 1px solid rgba(255,255,255,0.08);
  color: #fff;
  padding: 8px 14px;
  margin: 0 6px;
  border-radius: 8px;
  cursor:pointer;
  font-weight:600;
  transition: transform .12s ease, background .12s ease;
}
.controls button:hover{ transform: translateY(-2px); }
.controls button:active{ transform: translateY(0); }

.instructions{
  margin-top:10px;
  color: var(--muted);
  font-size: 14px;
}

/* responsive */
@media (max-width:640px){
  .score{ font-size: 28px; }
  canvas { height: auto; }
}