:root{
  --bg:#f5f7fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:rgba(17,24,39,.12);
  --btn:#eef2ff;
  --btn2:#f3f4f6;
  --accent:#e63946;
  --focus:rgba(230,57,70,.25);
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
}
.wrap{max-width:1100px;margin:0 auto;padding:18px}
.head{margin-bottom:14px}
.title{margin:0 0 6px;font-size:1.45rem;letter-spacing:.2px}
.subtitle{margin:0;color:var(--muted);line-height:1.35}
.panel{
  display:grid;
  grid-template-columns: 420px 1fr;
  grid-template-areas: "controls preview";
  gap:16px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px;
}
@media (max-width: 920px){
  .panel{grid-template-columns: 1fr; grid-template-areas: "preview" "controls";}
}
.controls{min-width:0;grid-area:controls}
.preview{min-width:0;display:flex;justify-content:center;align-items:flex-start;grid-area:preview}
.field{margin-bottom:12px}
label{display:block;font-size:.9rem;margin-bottom:6px;color:var(--muted)}
select,input[type="text"]{
  width:100%;
  background:#ffffff;
  border:1px solid var(--line);
  border-radius:12px;
  color:var(--text);
  padding:10px 12px;
  outline:none;
}
input[type="range"]{width:100%}
.sep{border:0;border-top:1px solid var(--line);margin:12px 0}
.btnRow{display:flex;gap:10px;flex-wrap:wrap}
button{
  appearance:none;
  border:1px solid var(--line);
  background:var(--btn);
  color:var(--text);
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
  font-weight:600;
}
button.ghost{background:var(--btn2)}
button.primary{background:var(--accent);border-color:rgba(0,0,0,.15)}
button:disabled{opacity:.5;cursor:not-allowed}
.hint{margin-top:6px;color:var(--muted);font-size:.85rem;line-height:1.3}
.thumbRow{display:flex;gap:12px;align-items:center}
.thumb{width:120px;height:80px;object-fit:contain;border-radius:12px;border:1px solid var(--line);background:#ffffff}
.thumbTitle{font-weight:700}
.thumbInfo{color:var(--muted);font-size:.85rem;margin-top:2px}
.canvasWrap{position:relative;display:block;max-width:720px;width:100%}
canvas{
  display:block;
  background:#ffffff;
  border-radius:14px;
  border:1px solid var(--line);
  max-width:100%;
  width:100%;
  height:auto;
  touch-action:none;
  cursor:grab;
}
.foot{margin-top:12px;color:var(--muted)}
code{background:rgba(255,255,255,.06);padding:2px 6px;border-radius:8px;border:1px solid var(--line)}

select:focus, input[type="text"]:focus, button:focus{
  outline: none;
  box-shadow: 0 0 0 4px var(--focus);
}

.preview{align-items:flex-start}
@media (max-width: 920px){
  .preview{justify-content:center}
  canvas{max-height:none}
}
@media (max-width: 920px){
  .canvasWrap{
    position: sticky;
    top: 12px;
    z-index: 5;
    background: var(--card);
    padding-bottom: 10px;
  }
}