* { box-sizing: border-box; }
body {
  margin: 0;
  background: #fafaf9;
  color: #242424;
  font: 16px/1.5 system-ui, sans-serif;
}
main { max-width: 1120px; margin: 0 auto; padding: 56px 24px; }
header { margin-bottom: 32px; }
h1 { margin: 0 0 8px; font-size: 32px; letter-spacing: -1px; }
h2 { margin: 0 0 20px; font-size: 18px; }
p { margin: 0; color: #666; }
roi-calculator { display: block; }
form { display: grid; grid-template-columns: minmax(300px, 2fr) minmax(0, 3fr); gap: 24px; }
section { min-width: 0; padding: 28px; border: 1px solid #e5e5e3; border-radius: 12px; background: white; }
.fields { display: grid; grid-template-columns: 1fr 100px; align-items: center; gap: 18px 16px; }
label { font-size: 14px; }
input { width: 100%; padding: 9px 10px; border: 1px solid #d5d5d3; border-radius: 6px; font: inherit; }
button { width: 100%; margin-top: 28px; padding: 12px; border: 0; border-radius: 6px; background: #242424; color: white; font: inherit; cursor: pointer; }
button:hover { background: #444; }
input:focus-visible, button:focus-visible { outline: 2px solid #9b7100; outline-offset: 3px; }
.note { margin-top: 16px; font-size: 12px; }
.output > p { font-size: 14px; }
.chart-wrapper { position: relative; height: 340px; margin-top: 24px; }
.hidden { display: none !important; }
@media (max-width: 760px) {
  main { padding: 32px 16px; }
  form { grid-template-columns: 1fr; }
  section { padding: 22px; }
}