* { box-sizing: border-box; }
body {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  color: #222;
  background: white;
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
a { color: #0645ad; }
header { border-bottom: 1px solid #ccc; padding-bottom: 16px; }
.brand { color: #222; font-size: 20px; font-weight: bold; text-decoration: none; }
.brand span { font-size: 14px; font-weight: normal; }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 12px; }
nav a[aria-current="page"] { font-weight: bold; }
main { margin: 28px 0 40px; }
h1 { font-size: 30px; line-height: 1.25; margin: 12px 0 20px; }
h2 { font-size: 21px; margin-top: 28px; }
.eyebrow, .note { color: #555; font-size: 14px; }
.cards article { margin: 28px 0; }
.cards article h2 { margin-top: 8px; }
.cards article span { color: #555; font-size: 13px; }
.steps { display: flex; flex-wrap: wrap; gap: 10px; }
button.button { padding: 6px 12px; font: inherit; cursor: pointer; }
button[aria-pressed="true"] { font-weight: bold; border: 2px solid #222; }
.diagram { display: block; width: 100%; height: auto; margin: 24px 0; }
footer { border-top: 1px solid #ccc; padding-top: 16px; font-size: 13px; }
footer span { display: block; }
.skip { position: absolute; left: -10000px; }
.skip:focus { position: static; }
:focus-visible { outline: 2px solid #0645ad; outline-offset: 3px; }
@media (max-width: 500px) {
  body { padding: 16px; }
  h1 { font-size: 26px; }
}