:root { color-scheme: light; }
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: #fff;
  color: #111;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.5;
}
body {
  min-height: 100vh;
  padding: 2rem 1.25rem;
}
main {
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
}
h1 {
  font-size: 1.75rem;
  font-weight: 650;
  margin: 0 0 1rem;
}
.canvas {
  min-height: 60vh;
  border: 1px dashed #d0d0d0;
  border-radius: 12px;
  padding: 1.25rem;
  background: #fff;
}
.note {
  margin: 0;
  color: #555;
}