:root{
  --bg:#0b1020;
  --panel:#0f1724;
  --accent:#58d68d;
  --muted:#9aa4b2;
}
*{box-sizing:border-box;font-family:Inter,system-ui,Arial;margin:0;padding:0}
body{background:linear-gradient(180deg,var(--bg),#0b0f14);color:#dfe7ee;min-height:100vh;display:flex;flex-direction:column;align-items:center;}
.topbar{width:100%;max-width:1100px;padding:12px 18px;display:flex;justify-content:space-between;align-items:center}
.topbar h1{font-size:18px;color:var(--accent);letter-spacing:1px}
.hud{display:flex;gap:12px;align-items:center}
.hud button{background:transparent;border:1px solid rgba(255,255,255,0.08);padding:6px 10px;border-radius:6px;color:#dfe7ee;cursor:pointer}
main{width:100%;max-width:1100px;display:flex;gap:18px;align-items:flex-start;padding:0 18px 60px 18px}
canvas{
  background:#edf2f7;
  border-radius:6px;
  display:block;
  box-shadow:0 8px 30px rgba(0,0,0,0.6);
  width: 100%;
  height: auto;
  max-height: 70vh;
  min-height: 220px;
}
.panel{width:280px;padding:14px;background:rgba(255,255,255,0.03);border-radius:8px;border:1px solid rgba(255,255,255,0.03)}
.hidden{display:none}
.upgrade-list{display:flex;flex-direction:column;gap:8px}
.upgrade{padding:8px;border-radius:6px;background:rgba(0,0,0,0.2);display:flex;flex-direction:column;gap:6px}
.u-title{font-weight:600}
.buy{align-self:flex-end;padding:6px 8px;border-radius:6px;border:none;background:var(--accent);color:#031519;cursor:pointer}
.help{flex:1;color:var(--muted);font-size:13px;padding-top:8px}
.ft{margin-top:auto;padding:18px;color:var(--muted)}
#resetBtn{background:transparent;border:1px dashed rgba(255,255,255,0.06);padding:6px 10px;border-radius:6px;color:#f66}

#controls {
    position: fixed;
    bottom: 20px;
    width: 100%;
    display: flex;
    justify-content: space-around;
    z-index: 9999;
}

#controls button {
    width: 70px;
    height: 70px;
    font-size: 2rem;
    border-radius: 50%;
    border: none;
    background: rgba(0,0,0,0.5);
    color: white;
}