body{
  margin:0;
  font-family:system-ui,sans-serif;
  background:#fafafa;
  display:flex;
  flex-direction:column;
  min-height:100vh
}

header,footer{
  background:#222;
  color:#fff;
  padding:.6rem 1rem
}

h1{margin:0;font-size:1.3rem}

#controls{
  display:flex;
  flex-wrap:wrap;
  gap:1rem;
  justify-content:center;
  padding:.8rem 0 0;
  margin:.6rem 0
}

#controls label{
  white-space:nowrap;
  font-size:.9rem;
  display:flex;
  align-items:center;
  gap:.35rem
}

#controls select,#controls button{
  padding:4px 10px;
  font-size:.9rem;
  border:1px solid #888;
  border-radius:4px;
  background:#fff;
  box-shadow:0 1px 2px rgba(0,0,0,.1);
  cursor:pointer;
  transition:border-color .2s,box-shadow .2s
}

#controls select:hover,#controls button:hover{
  border-color:#2684ff;
  box-shadow:0 0 4px rgba(38,132,255,.4)
}

#controls button{
  background:#2684ff;
  color:#fff;
  margin-left:1rem
}

#controls button:hover{background:#1c6cd9}

#chart{
  flex:1 1 auto;
  max-width:1200px;
  max-height:650px;
  width:100%;
  height:100%;
  margin:0 auto;
  position:relative
}

#description{
  text-align:center;
  margin:.8rem 0 1.2rem
}

#description p{
  margin:.4rem 0 .8rem;
  font-size:.95rem
}

.btn{
  display:inline-block;
  padding:.5rem 1.4rem;
  background:#2684ff;
  color:#fff;
  font-size:.9rem;
  border:none;
  border-radius:4px;
  text-decoration:none;
  box-shadow:0 2px 4px rgba(0,0,0,.15);
  transition:background .2s,box-shadow .2s
}

.btn:hover{
  background:#1c6cd9;
  box-shadow:0 3px 6px rgba(0,0,0,.25)
}
.axis-label {
  fill: #222;            /* dark color */
  font-size: 0.9rem;     /* adjust as needed */
  font-weight: bold;
}

svg{width:100%;height:100%;max-width:1200px;max-height:650px}

.axis path,.axis line{stroke:#666;shape-rendering:crispEdges}

.lineA{fill:none;stroke:steelblue;stroke-width:1.4}
.lineB{fill:none;stroke:tomato;stroke-width:1.4}

.dark-rect{fill:#d0d4ff;opacity:.25}
.light-rect{fill:#ffffcc;opacity:.5}

/* .dark-rect{fill:#6a8cc2;opacity:.25}
.light-rect{fill:#eaea9d;opacity:.5} */

.ovuline{stroke:#000;stroke-width:1;stroke-dasharray:4 4}

.legendBox{width:10px;height:10px}
.legendBox {
  stroke: #666;     /* charcoal border */
  stroke-width: 1;
}

.legend text{font-size:.8rem}

.tooltip{
  position:absolute;
  background:rgba(0,0,0,.8);
  color:#fff;
  font-size:.75rem;
  padding:3px 6px;
  border-radius:3px;
  pointer-events:none;
  opacity:0
}