:root {
  --background: #f7f8f6;
  --surface: #ffffff;
  --text: #17242b;
  --muted: #617078;
  --border: #dce2de;
  --accent: #087f80;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-family: Arial, Helvetica, sans-serif;
}

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

.site-header,
main,
footer {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

.site-header {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.brand span {
  width: 16px;
  height: 16px;
  border: 4px solid var(--accent);
  border-radius: 50%;
}

.intro {
  padding: clamp(3.5rem, 10vw, 6.5rem) 0 3rem;
  border-bottom: 1px solid var(--border);
}

.label,
.section-number,
.updated {
  color: var(--muted);
  font-family: "Courier New", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.label,
.section-number {
  color: var(--accent);
  font-weight: 700;
}

h1 {
  margin: 0.75rem 0 1rem;
  font-size: clamp(2.75rem, 9vw, 5rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

.summary {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 3vw, 1.25rem);
  line-height: 1.6;
}

.updated {
  margin: 1.5rem 0 0;
}

nav {
  max-width: 600px;
  margin: 3rem auto;
  padding: 1.5rem 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

nav h2 {
  margin: 0 0 1rem;
  font-size: 1rem;
}

nav ol {
  margin: 0;
  padding-left: 1.4rem;
  columns: 2;
  column-gap: 2.5rem;
}

nav li {
  margin: 0 0 0.65rem;
  color: var(--muted);
  break-inside: avoid;
}

nav a {
  color: var(--text);
}

.policy {
  border-top: 1px solid var(--border);
}

section {
  padding: clamp(2.5rem, 7vw, 4rem) 0;
  border-bottom: 1px solid var(--border);
}

.section-number {
  margin: 0 0 0.5rem;
}

section h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.55rem, 5vw, 2.15rem);
  line-height: 1.2;
}

section p,
section li {
  color: #43535b;
  font-size: 1rem;
  line-height: 1.75;
}

section p {
  margin: 0;
}

section ul {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

section li + li {
  margin-top: 1rem;
}

strong {
  color: var(--text);
}

footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 540px) {
  .site-header,
  main,
  footer {
    width: min(100% - 1.5rem, 760px);
  }

  nav {
    padding: 1.25rem;
  }

  nav ol {
    columns: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}