/* ── VARIABLES ── */
:root {
  --bg:#040a10; --panel:#060e16; --border:#122030; --border2:#1a3048;
  --tower:#00d4ff; --tower-g:rgba(0,212,255,0.35); --health:#00ff88;
  --danger:#ff3355; --credits:#ffd700; --text:#b8d8e8; --dim:#2a4a60;
  --dim2:#3a6080; --bought:#1a3020; --locked:#0a1520;
  --mono:'Share Tech Mono',monospace; --orb:'Orbitron',monospace;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html,body{width:100%;height:100%;overflow:hidden;background:#020508;color:var(--text);font-family:var(--mono);font-size:13px;user-select:none}

/* ── CANVAS: full viewport, behind everything ── */
#canvas{position:fixed;top:0;left:0;z-index:0;display:block}