:root{
  --bg:#0b0d12;
  --panel:#141826;
  --panel2:#0f1320;
  --text:#e7e9ee;
  --muted:#a8afc0;
  --border:rgba(255,255,255,.12);
  --accent:#7aa2ff;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:linear-gradient(180deg,var(--bg),#070911);
  color:var(--text);
}
.topbar{
  padding:18px 20px;
  border-bottom:1px solid var(--border);
  background:rgba(10,12,18,.75);
  backdrop-filter: blur(10px);
}
h1{margin:0;font-size:18px;letter-spacing:.2px}
.sub{margin:6px 0 0;color:var(--muted);font-size:13px}

.wrap{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap:16px;
  padding:16px;
}
.controls{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:16px;
  padding:14px;
}
.row{
  display:grid;
  grid-template-columns: 1fr;
  gap:8px;
  margin:12px 0;
}
label{font-size:13px;color:var(--muted)}
select, input[type="range"], button{
  width:100%;
}
select{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:var(--panel2);
  color:var(--text);
  outline:none;
}
output{
  color:var(--text);
  font-size:13px;
  opacity:.9;
}
.row.buttons{
  margin-top:14px;
}
button{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(122,162,255,.35);
  background:rgba(122,162,255,.18);
  color:var(--text);
  cursor:pointer;
}
button:hover{
  background:rgba(122,162,255,.26);
}
.hint{
  margin-top:14px;
  padding:10px 12px;
  border-radius:12px;
  border:1px dashed rgba(255,255,255,.18);
  color:var(--muted);
  font-size:12px;
}
.hint code{color:#d7dcff}

.stage{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:16px;
  padding:14px;
  min-height: 520px;
  display:flex;
  flex-direction:column;
  gap:10px;
}
#canvasMount{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
}
.readout{
  color:var(--muted);
  font-size:12px;
  border-top:1px solid var(--border);
  padding-top:10px;
}

/* Mobile */
@media (max-width: 900px){
  .wrap{grid-template-columns: 1fr}
}