:root{
  --bg0:#050816;
  --bg1:#03040b;
  --lane:#1a2a4a;
  --text:#eaf2ff;
  --muted:#9db2d1;
  --danger:#ff3b3b;
  --safe:#35ff9a;
  --wall:#e7edf7;
  --pulse:#33d6ff;
  --phase:#b7a6ff;
}

*{ box-sizing:border-box; }
html,body{
  margin:0; padding:0;
  width:100%; height:100%;
  background: radial-gradient(1200px 800px at 50% 30%, var(--bg0), var(--bg1));
  overflow:hidden;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

#game{
  display:block;
  width:100vw;
  height:100vh;
}

/* top-right controls */
#ui{
  position:fixed;
  top: env(safe-area-inset-top, 10px);
  right: env(safe-area-inset-right, 10px);
  padding: 10px;
  display:flex;
  gap:10px;
  z-index:10;
  pointer-events:none;
}

.pill{
  pointer-events:auto;
  width: 44px;
  height: 44px;
  border:1px solid rgba(255,255,255,0.16);
  background: rgba(10,14,30,0.55);
  color: var(--text);
  border-radius: 999px;
  font-size: 18px;
  line-height: 1;
  display:grid;
  place-items:center;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.28);
}
.pill:active{ transform: scale(0.97); }

/* Help overlay */
.overlay{
  position:fixed;
  inset:0;
  background: rgba(0,0,0,0.55);
  display:flex;
  justify-content:center;
  align-items:center;
  padding: 18px;
  z-index:50;
}
.hidden{ display:none; }

.panel{
  width:min(520px, 96vw);
  border:1px solid rgba(255,255,255,0.14);
  background: rgba(10,14,30,0.72);
  border-radius: 18px;
  padding: 18px;
  color: var(--text);
  backdrop-filter: blur(12px);
  box-shadow: 0 30px 80px rgba(0,0,0,0.45);
}
.panelTitle{
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}
.tip{
  display:flex;
  gap:10px;
  align-items:flex-start;
  font-size: 14px;
  line-height: 1.35;
  color: rgba(234,242,255,0.92);
  margin: 10px 0;
}
.tip b{ color: var(--text); }

.dot{
  width: 10px;
  height: 10px;
  border-radius: 999px;
  margin-top: 5px;
  flex: 0 0 10px;
}
.dot.blue{ background: var(--pulse); }
.dot.purple{ background: var(--phase); }
.dot.red{ background: var(--danger); }
.dot.green{ background: var(--safe); }
.dot.gray{ background: var(--wall); }
.dot.white{ background: #ffffff; }

.hr{
  height:1px;
  background: rgba(255,255,255,0.12);
  margin: 12px 0;
}

.bigBtn{
  width: 100%;
  margin-top: 12px;
  border: 0;
  border-radius: 14px;
  background: rgba(51,214,255,0.15);
  color: var(--text);
  padding: 12px 14px;
  font-size: 16px;
  font-weight: 650;
  cursor:pointer;
}
.bigBtn:active{ transform: scale(0.99); }