:root{
  --bg:#f7f8fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --accent:#2563eb;
  --soft:#eef2ff;
  --shadow: 0 8px 20px rgba(17,24,39,.08);
  --radius:16px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 14px;
  border-bottom:1px solid var(--line);
  background:rgba(247,248,251,.9);
  backdrop-filter: blur(10px);
}

.brand{display:flex; gap:10px; align-items:center;}
.logo{
  width:38px; height:38px;
  display:grid; place-items:center;
  border-radius:12px;
  background:linear-gradient(135deg,var(--soft),#fff);
  border:1px solid var(--line);
  font-weight:800;
}
.brandName{font-weight:800; line-height:1.1}
.brandTag{font-size:12px; color:var(--muted)}

.topbarRight{display:flex; gap:10px; align-items:center}
.pill{
  font-size:12px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:#fff;
}

.langSwitch{
  display:flex;
  border:1px solid var(--line);
  border-radius:999px;
  overflow:hidden;
  background:#fff;
}
.langBtn{
  border:0;
  padding:7px 10px;
  font-weight:700;
  background:transparent;
  cursor:pointer;
}
.langBtn.isActive{
  background:var(--soft);
  color:var(--accent);
}

.layout{
  display:grid;
  grid-template-columns: 360px 1fr;
  gap:14px;
  padding:14px;
  max-width:1200px;
  margin:0 auto;
}

@media (max-width: 960px){
  .layout{grid-template-columns: 1fr}
}

.panel{display:flex; flex-direction:column; gap:12px}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow: var(--shadow);
  padding:12px;
}
.cardTitle{font-weight:800; margin-bottom:10px}

.uploader{
  border:1px dashed #c7cdd8;
  border-radius:14px;
  padding:14px;
  background: #fbfcff;
  position:relative;
}
.uploader input[type="file"]{
  position:absolute;
  inset:0;
  opacity:0;
  cursor:pointer;
}
.uploaderInner{
  display:flex; flex-direction:column; gap:6px;
  align-items:center; text-align:center;
  padding:10px 0;
}
.uploaderIcon{font-size:22px}
.uploaderText{font-weight:800}
.uploaderSub{font-size:12px; color:var(--muted)}

.field{display:flex; flex-direction:column; gap:6px}
.fieldLabel{font-weight:800; font-size:13px}
.fieldRow{
  display:flex; align-items:center; gap:8px;
}
.fieldRow input{
  width:120px;
  padding:10px 10px;
  border-radius:12px;
  border:1px solid var(--line);
  font-size:16px;
  outline:none;
}
.fieldRow input:focus{border-color:#b9cdfa; box-shadow: 0 0 0 3px rgba(37,99,235,.12);}
.unit{color:var(--muted); font-weight:800}
.fieldHelp{font-size:12px; color:var(--muted); line-height:1.35}

.stats{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
  margin-top:6px;
}
.stat{
  border:1px solid var(--line);
  border-radius:14px;
  padding:10px;
  background:#fff;
}
.statLabel{font-size:12px; color:var(--muted); font-weight:800}
.statValue{margin-top:4px; font-weight:900}

.divider{height:1px; background:var(--line); margin:10px 0}

.zoomRow{display:flex; flex-direction:column; gap:8px}
.zoomLabel{font-weight:900; font-size:13px}
.zoomControls{display:flex; gap:8px; align-items:center; flex-wrap:wrap}
.btn,.btnGhost{
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px 12px;
  background:#fff;
  font-weight:900;
  cursor:pointer;
}
.btn:active,.btnGhost:active{transform: translateY(1px)}
.btnGhost{
  background:var(--soft);
  color:var(--accent);
  border-color:#cfe0ff;
}
.zoomValue{
  min-width:64px;
  text-align:center;
  font-weight:900;
  color:#0f172a;
}

.note{background:linear-gradient(135deg,#ffffff, #f6f9ff)}
.noteTitle{font-weight:900; margin-bottom:6px}
.noteBody{font-size:13px; color:#334155; line-height:1.4}

.preview{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow: var(--shadow);
  display:flex;
  flex-direction:column;
  overflow:hidden;
  min-height:540px;
}

.previewHeader{
  padding:12px 12px 10px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:10px;
}
.previewTitle{font-weight:900}
.previewHint{font-size:12px; color:var(--muted)}

.stageWrap{
  position:relative;
  flex:1;
  background:
    radial-gradient(circle at 20px 20px, rgba(15,23,42,.06) 1px, transparent 1px) 0 0 / 20px 20px,
    #fbfcff;
  overflow:auto;
}
.stage{
  position:relative;
  margin:18px;
  transform-origin: top left;
  display:inline-block;
  border-radius:14px;
}
.stage img{
  display:block;
  max-width:none;
  border-radius:14px;
  border:1px solid var(--line);
  background:#fff;
}

/* --- Módulo 2: overlay máscara --- */
.maskOverlayCanvas{
  position:absolute;
  left:0;
  top:0;
  pointer-events:none;
  border-radius:14px;
}

/* --- Módulo 3: pintado guiado --- */
.guidedPaintCanvas{
  position:absolute;
  left:0;
  top:0;
  pointer-events:none; /* se activa dinámicamente */
  border-radius:14px;
}

.overlay{
  position:absolute;
  inset:0;
  pointer-events:none;
}
.badge{
  position:absolute;
  left:10px; top:10px;
  font-size:12px;
  font-weight:900;
  padding:6px 10px;
  border-radius:999px;
  background:rgba(255,255,255,.92);
  border:1px solid var(--line);
}
#helpRange{ width:160px; }
#helpToggle{ transform: scale(1.05); }