<style>
   :root { color-scheme: light dark; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 18px;
  line-height: 1.35;
  color: CanvasText;
  background: Canvas;
}

h1 { font-size: 1.15rem; margin: 0 0 10px; }
h2 { font-size: 1.0rem; margin: 0 0 10px; }
h3 { font-size: 0.98rem; margin: 0 0 10px; }

.wrap { max-width: 1400px; margin: 0 auto; }
.sub { margin: 0 0 12px; opacity: 0.85; font-size: 0.95rem; }

.small { font-size: 0.92rem; }
.muted { opacity: 0.80; }

.grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 14px; align-items: start; }
@media (max-width: 1020px){ .grid { grid-template-columns: 1fr; } }

.card {
  border: 1px solid rgba(127,127,127,0.35);
  border-radius: 12px;
  padding: 14px;
  background: rgba(127,127,127,0.03);
}

.sectionTitleRow { display:flex; justify-content:space-between; gap:10px; align-items:baseline; margin-bottom: 10px; }

.formGrid2 { display:grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px){ .formGrid2 { grid-template-columns: 1fr; } }

.field { display:grid; gap: 6px; }
.field label { font-size: 0.92rem; opacity: 0.9; }

input, select {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 10px;
  border-radius: 10px;
  border: 1px solid rgba(127,127,127,0.45);
  background-color: Canvas;
  color: CanvasText;
  font-size: 0.98rem;
  min-width: 0;
}

input[type="number"] { min-height: 42px; }
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { opacity: 0.6; }

.eyesGrid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
@media (max-width: 1020px){ .eyesGrid { grid-template-columns: 1fr; } }

.eyeCard { border: 1px solid rgba(127,127,127,0.25); border-radius: 12px; padding: 12px; background: rgba(127,127,127,0.02); }
.rxGrid { display:grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; align-items:end; }
@media (max-width: 520px){ .rxGrid { grid-template-columns: 1fr; } }

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid rgba(127,127,127,0.22);
  background: rgba(127,127,127,0.02);
  margin-top: 12px;
}
.toolbar .group { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.pill { display:inline-block; padding: 2px 8px; border-radius: 999px; border: 1px solid rgba(127,127,127,0.4); font-size: 0.82rem; opacity: 0.9; }

.btns { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
button {
  -webkit-appearance: none;
  appearance: none;
  opacity: 1 !important;
  background-color: Canvas;
  color: CanvasText;
  -webkit-text-fill-color: CanvasText;
  border: 1px solid rgba(127,127,127,0.45);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
  cursor: pointer;
}
button:hover { border-color: rgba(127,127,127,0.75); }
button:active { transform: translateY(1px); }
button.ghost { background-color: rgba(127,127,127,0.06); border-style: dashed; }

.warn { color: #b00020; }
.ok { color: #0a7a2f; }
hr { border: none; border-top: 1px solid rgba(127,127,127,0.22); margin: 14px 0; }

.vizWrap { width: 100%; }
svg { width: 100%; height: auto; display:block; }

.titleSmall { font-size: 13px; fill: CanvasText; opacity: 0.90; }
.legendText { font-size: 12px; fill: CanvasText; opacity: 0.86; }

.aperture { fill: none; stroke: rgba(127,127,127,0.30); stroke-width: 2; }
.axisLine { stroke: rgba(127,127,127,0.55); stroke-width: 1.5; }

.gridDot { fill: rgba(127,127,127,0.75); }

.arrow { fill: none; stroke-linecap: round; stroke-width: 1.4; }
.arrowOD   { stroke: rgba(60, 150, 90, 0.70); }
.arrowOS   { stroke: rgba(60, 120, 200, 0.70); }
.arrowDiff { stroke: rgba(200, 80, 80, 0.78); }

.heatCell { shape-rendering: crispEdges; }
/* Wider inputs column, slightly narrower viz column */
.grid {
  grid-template-columns: 1.15fr 0.85fr;
}

/* Keep the left card readable on mid-width screens */
@media (max-width: 1200px) {
  .grid { grid-template-columns: 1fr; }
}
/* Prevent labels and selects from being squeezed into narrow columns */
.formGrid2, .rxGrid {
  column-gap: 14px;
}

.field input,
.field select {
  min-width: 140px; /* key: prevents cramped narrow boxes */
}
.toolbar {
  gap: 12px;
  align-items: flex-end;
}

.toolbar .group {
  gap: 10px;
}

.toolbar label.small.muted {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.eyeCard h3 { margin-bottom: 10px; }

/* Give each Rx field more breathing room */
.rxGrid {
  grid-template-columns: 1.15fr 1.15fr 0.7fr; /* axis a bit narrower */
  gap: 12px;
}

@media (max-width: 520px) {
  .rxGrid { grid-template-columns: 1fr; }
}
/* Only on tighter widths: reduce padding so fields don't collide */
@media (max-width: 920px) {
  input, select {
    padding: 9px 9px;
    font-size: 0.95rem;
  }
  .card { padding: 12px; }
}
.vizStack{
  position: relative;
  width: 100%;
  max-width: 900px; /* optional */
}

.vizStack svg{
  display:block;
  width:100%;
  height:auto;
}

#heatCanvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  pointer-events:none;
}
input[type="checkbox"]{
  -webkit-appearance: checkbox !important;
  appearance: auto !important;
  width: 16px;
  height: 16px;
}

.toolbar label{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}