:root{
  --bg:#0b1020;
  --panel:#0f1730;
  --card:#111c3a;
  --text:#e8eeff;
  --muted:#a9b5da;
  --border:rgba(255,255,255,.08);
  --accent:#6ea8fe;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background: radial-gradient(1200px 600px at 20% 10%, rgba(110,168,254,.18), transparent 60%),
              radial-gradient(900px 500px at 80% 90%, rgba(163,110,254,.14), transparent 60%),
              var(--bg);
}

.app{
  height:100%;
  display:grid;
  grid-template-columns: 380px 1fr;
}

.panel{
  border-right:1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent 35%), var(--panel);
  padding:18px;
  overflow:auto;
}

.panel__header{margin-bottom:14px;}
.title{font-size:18px;margin:0 0 6px 0;}
.subtitle{color:var(--muted);font-size:12px;line-height:1.4;}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.04), transparent 45%), var(--card);
  border:1px solid var(--border);
  border-radius:12px;
  padding:12px;
  margin-bottom:12px;
}
.card__title{font-weight:600;font-size:13px;margin-bottom:10px;color:#f2f5ff;}

input[type="file"]{
  width:100%;
  padding:10px;
  border-radius:10px;
  border:1px dashed rgba(255,255,255,.16);
  background: rgba(0,0,0,.12);
  color:var(--text);
}

textarea{
  width:100%;
  resize:vertical;
  min-height:120px;
  padding:10px;
  border-radius:10px;
  border:1px solid var(--border);
  background: rgba(0,0,0,.16);
  color:var(--text);
  outline:none;
}

.hint{margin-top:8px;color:var(--muted);font-size:12px;}

.formRow{
  display:grid;
  grid-template-columns: 92px 1fr;
  gap:10px;
  align-items:center;
  margin:10px 0;
}
.formRow label{color:var(--muted);font-size:12px;}
.formRow__control{display:flex;gap:10px;align-items:center;}
.formRow__control input[type="range"]{width:100%;}
.value{min-width:84px;text-align:right;color:var(--text);font-variant-numeric: tabular-nums; font-size:12px;opacity:.95;}

.btnRow{display:flex;gap:10px;margin-top:12px;}
.btn{
  flex:1;
  border-radius:10px;
  border:1px solid rgba(255,255,255,.14);
  background: rgba(110,168,254,.18);
  color:var(--text);
  padding:10px 12px;
  cursor:pointer;
}
.btn:disabled{opacity:.45;cursor:not-allowed;}
.btn--ghost{background: rgba(255,255,255,.06);}

.status{margin-top:10px;color:var(--muted);font-size:12px;min-height:16px;}

.preview{
  padding:18px;
  overflow:auto;
}
.preview__header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px;}
.preview__title{font-size:14px;font-weight:600;}
.preview__meta{color:var(--muted);font-size:12px;}

.canvasWrap{
  position:relative;
  border-radius:14px;
  border:1px solid var(--border);
  background: rgba(0,0,0,.12);
  padding:14px;
  min-height: calc(100vh - 18px*2 - 28px);
  display:flex;
  justify-content:center;
  align-items:center;
}

#canvas{
  max-width: 100%;
  max-height: calc(100vh - 160px);
  border-radius:10px;
  background: rgba(0,0,0,.12);
}

.emptyState{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--muted);
  font-size:13px;
  pointer-events:none;
}

@media (max-width: 980px){
  .app{grid-template-columns: 1fr;}
  .panel{border-right:none;border-bottom:1px solid var(--border);}
  #canvas{max-height: 60vh;}
}