:root{
  --bg:#0f1724;
  --card:#0b1220;
  --accent:#7c3aed;
  --muted:#9aa4b2;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, #071028 0%, #0b1220 100%);
  color:#e6eef8;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  align-items:center;
}
.header{
  text-align:center;
  padding:36px 16px 8px;
}
.header h1{
  margin:0;
  font-size:28px;
  letter-spacing:0.4px;
}
.tagline{margin-top:6px;color:var(--muted)}

.container{
  width:100%;
  max-width:1100px;
  display:grid;
  grid-template-columns: 420px 1fr;
  gap:20px;
  padding:20px;
}

.controls{
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:12px;
  padding:18px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.6);
  border:1px solid rgba(255,255,255,0.03);
}

.input-row label{display:block;margin-bottom:8px;font-size:13px;color:var(--muted)}
.input-row input{
  width:100%;
  margin-top:6px;
  padding:10px 12px;
  border-radius:8px;
  border:1px solid rgba(255,255,255,0.06);
  background:transparent;
  color:inherit;
}

.buttons{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
button{
  background:var(--accent);
  border:none;
  padding:10px 12px;
  border-radius:10px;
  color:white;
  cursor:pointer;
  font-weight:600;
  box-shadow: 0 6px 14px rgba(124,58,237,0.18);
}
button.secondary{background:transparent;border:1px solid rgba(255,255,255,0.06); color:var(--muted)}

.options{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px;font-size:13px;color:var(--muted)}
.options label{display:flex;flex-direction:column; gap:6px}

.preview{
  display:flex;
  flex-direction:column;
  gap:12px;
  align-items:center;
}

.canvas-wrap{
  width:100%;
  max-width:720px;
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  padding:14px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: 0 10px 30px rgba(2,6,23,0.7);
}

canvas{
  width:100%;
  height:auto;
  display:block;
  border-radius:6px;
  background:#111827;
}

.footer{padding:20px;color:var(--muted); text-align:center; width:100%}

@media(max-width:900px){
  .container{grid-template-columns:1fr; padding:12px}
}