* { box-sizing: border-box; }
body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #fafafa;
  color: #222;
}
.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 24px 36px;
}
.hero {
  margin-bottom: 14px;
}
h1 {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1.2;
}
p {
  margin: 0;
  color: #4b5563;
}
.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 18px;
}
.card {
  background: white;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 14px 14px 12px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
.card h3 {
  margin: 0 0 10px;
  font-size: 14px;
  color: #666;
  font-weight: 600;
}
.card-wide {
  grid-column: 1 / -1;
}
svg {
  display: block;
  width: 100%;
  height: auto;
}
.original { stroke: #ccc; stroke-width: 1.5; fill: none; stroke-dasharray: 4 3; }
.rounded { stroke: #2563eb; stroke-width: 2.5; fill: none; }
.ctrl { fill: #f59e0b; }
.pt { fill: #1f2937; }
label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
}
input[type=range] {
  width: 220px;
  vertical-align: middle;
}
#rval {
  min-width: 28px;
  font-variant-numeric: tabular-nums;
}
.controls {
  margin-top: 14px;
  padding: 12px 14px;
  background: white;
  border: 1px solid #ddd;
  border-radius: 10px;
}