:root {
  color-scheme: light;
  --navy: #112b46;
  --navy-deep: #0c2137;
  --teal: #087d80;
  --teal-light: #8be4dc;
  --ink: #23384b;
  --muted: #506477;
  --line: #d7e3e8;
  --paper: #ffffff;
  --background: #f2f6f8;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }
body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}
a { color: var(--teal); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 4px;
}
.container { width: min(100% - 3rem, 68rem); margin-inline: auto; }
.skip-link {
  position: absolute;
  top: -8rem;
  left: 1rem;
  z-index: 2;
  padding: 0.75rem 1rem;
  background: var(--paper);
  color: var(--navy);
}
.skip-link:focus { top: 1rem; }
.page-header {
  padding: 3.5rem 0 2rem;
  background: var(--navy);
  color: var(--paper);
  border-top: 6px solid var(--teal-light);
}
.eyebrow, .step {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.eyebrow { margin: 0 0 1rem; color: var(--teal-light); }
h1 {
  max-width: 20ch;
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}
.intro { max-width: 44rem; margin: 1.5rem 0 1rem; font-size: 1.15rem; }
.usage { max-width: 46rem; color: #c7d8e6; font-size: 0.9rem; }
nav { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 2rem; }
nav a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 1rem;
  border: 1px solid #617b91;
  border-radius: 0.4rem;
  color: var(--paper);
  text-decoration: none;
}
nav a:hover { background: #203f59; border-color: var(--teal-light); }
nav a:focus-visible { outline-color: var(--teal-light); }
.nav-number { color: var(--teal-light); font-size: 0.8rem; font-weight: 700; }
main { padding-block: 2rem 3rem; }
section {
  margin-bottom: 1.5rem;
  padding: 2rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  scroll-margin-top: 1rem;
}
section:last-child { margin-bottom: 0; }
.section-heading { max-width: 48rem; }
.step { color: var(--teal); }
h2 {
  margin: 0.4rem 0 0.6rem;
  color: var(--navy);
  font-size: clamp(1.6rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.section-heading p { margin: 0; color: var(--muted); }
.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 2rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}
.checklist li { padding: 1.1rem 0; border-top: 1px solid var(--line); }
.checklist strong { display: block; color: var(--navy); font-size: 1.05rem; }
.checklist p { margin: 0.4rem 0 0; }
.checkpoint {
  margin: 0;
  padding: 0.9rem 1rem;
  background: #edf8f6;
  border-left: 3px solid var(--teal);
  border-radius: 0 0.3rem 0.3rem 0;
  font-size: 0.95rem;
}
.page-footer { padding: 2rem 0; background: var(--navy-deep); color: #c7d8e6; }
.footer-content { display: flex; justify-content: space-between; gap: 2rem; }
.footer-content > div { min-width: 0; }
.page-footer p { margin: 0 0 0.5rem; }
.footer-brand { color: var(--paper); font-weight: 700; }
.page-footer a { display: inline-block; padding-block: 0.4rem; color: var(--teal-light); }
.page-footer a:focus-visible, summary:focus-visible { outline-color: var(--teal-light); }
.version { max-width: 25rem; font-size: 0.8rem; }
summary { cursor: pointer; padding-block: 0.4rem; color: #c7d8e6; }
#version-full { display: block; padding-block: 0.5rem; overflow-wrap: anywhere; }

@media (max-width: 42rem) {
  .container { width: calc(100% - 2rem); }
  .page-header { padding-top: 2.25rem; }
  nav { flex-direction: column; }
  nav a { width: 100%; }
  section { padding: 1.25rem; }
  .checklist { grid-template-columns: minmax(0, 1fr); }
  .footer-content { flex-direction: column; gap: 1.5rem; }
}

@media print {
  body { background: white; color: black; font-size: 10pt; }
  .page-header, .page-footer { background: white; color: black; }
  .eyebrow, .usage, .page-footer a, .footer-brand { color: black; }
  nav, .skip-link, .version { display: none; }
  .container { width: 100%; }
  .page-header, main, .page-footer { padding-block: 0.5rem; }
  section { padding: 1rem; break-inside: avoid; }
  .checklist { grid-template-columns: minmax(0, 1fr); margin-block: 0.5rem; }
  .checklist li { padding-block: 0.5rem; }
}