:root {
  --surface: #ffffff;
  --text: #171717;
  --accent: #002fa7;
  --rule: #dddddf;
  --space: 1rem;
  --brand-mark-size: 3rem;
  --brand-name-size: 1.5rem;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--surface); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; line-height: 1.5; }
header { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: var(--space); padding: 1.5rem 5vw; border-bottom: 1px solid var(--rule); }
header a { color: var(--text); font-weight: 700; text-decoration: none; }
.brand { display: inline-flex; align-items: center; gap: calc(var(--space) * .75); }
.brand-mark { display: block; width: var(--brand-mark-size); height: var(--brand-mark-size); flex: none; }
.brand-name { font-size: var(--brand-name-size); line-height: 1; letter-spacing: -.03em; }
main { max-width: 48rem; padding: 8vh 5vw; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.12; font-weight: 500; letter-spacing: -.03em; }
p { margin-block: 1.5rem; }
a { color: var(--accent); }
button, .button { display: inline-block; background: var(--accent); color: var(--surface); font: inherit; border: 1px solid var(--accent); padding: .7rem 1.15rem; text-decoration: none; cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.purchase-list { padding: 0; list-style: none; }
.purchase-list li { display: grid; gap: var(--space); padding-block: var(--space); border-block-start: 1px solid var(--rule); }
button:disabled { cursor: wait; }
@media (forced-colors: active) { button, .button { border: 1px solid ButtonText; } }