:root { color-scheme: dark; font-family: var(--font-sans); background: var(--ink); color: var(--paper); }
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { color: var(--sage-light); }
a:focus-visible { outline: 2px solid var(--sage-light); outline-offset: 6px; }
.skip-link { position: absolute; top: -100px; left: 24px; padding: 12px; background: var(--paper); color: var(--ink); }
.skip-link:focus { top: 12px; }
.page-header, main, footer { width: min(1120px, calc(100% - 112px)); margin-inline: auto; }
.page-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 36px; }
.wordmark { font-size: 25px; font-weight: 800; letter-spacing: var(--tracking-display); text-decoration: none; }
.back-link { font-size: 15px; text-decoration: none; padding-block: 12px; }
.intro { padding: 80px 0 72px; }
h1 { max-width: 1000px; margin: 0 0 36px; font-size: clamp(44px, 7.6vw, 96px); font-weight: 800; line-height: 1.02; letter-spacing: var(--tracking-display); }
.intro p { max-width: 700px; }
p { color: var(--text-secondary); font-size: 19px; line-height: 1.6; margin: 0 0 20px; }
p.lead { color: var(--sage-light); max-width: 900px; font-size: clamp(26px, 3.3vw, 38px); font-weight: 700; letter-spacing: -.035em; line-height: 1.2; margin-bottom: 32px; }
.chapter { display: grid; grid-template-columns: 1fr 1.65fr; gap: 64px; border-top: 1px solid var(--line); padding-block: 56px; }
h2 { font-size: clamp(28px, 3vw, 38px); line-height: 1.12; letter-spacing: var(--tracking-heading); margin: 0; font-weight: 700; }
h3 { font-size: 23px; line-height: 1.2; letter-spacing: -.03em; margin: 0 0 12px; }
.step + .step { margin-top: 36px; }
.section-note { margin-top: 28px; }
.chapter-body > :last-child, .step > :last-child { margin-bottom: 0; }
.contact { display: inline-flex; align-items: center; gap: 24px; max-width: 100%; padding: 12px 0; font-size: 25px; font-weight: 700; color: var(--sage-light); }
footer { display: flex; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); padding-block: 32px 48px; font-size: 14px; }
footer a { padding-block: 8px; }
@media (max-width: 700px) {
  .page-header, main, footer { width: calc(100% - 48px); }
  .page-header { padding-block: 20px; }
  .intro { padding: 44px 0; }
  h1 { font-size: clamp(38px, 10.8vw, 68px); margin-bottom: 28px; }
  .chapter { grid-template-columns: 1fr; gap: 28px; padding-block: 36px; }
  p { font-size: 18px; }
  footer { flex-wrap: wrap; }
}