:root {
  --bg: #fbfaf8;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --line: #e6e3de;
  --accent: #2f4a6d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --text: #ececef;
    --muted: #9a9aa2;
    --line: #2a2a2e;
    --accent: #9db7d9;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.wrap {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 20px;
}
main { flex: 1; padding-top: 18vh; padding-bottom: 48px; }
.mark {
  width: 44px; height: 44px; margin: 0 0 24px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--accent); color: var(--bg);
  font-weight: 700; font-size: 22px;
}
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 20px; letter-spacing: -0.01em; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 40px 0 8px; font-weight: 600; }
h3 { font-size: 18px; margin: 28px 0 6px; }
.lead { font-size: 19px; margin: 0; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid currentColor; }
a:hover { opacity: 0.8; }
footer { border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: 28px; color: var(--muted); font-size: 14px; }
footer p { margin: 0; }
/* Homepage mountain background */
.home { position: relative; }
.home .scenery {
  position: fixed; inset: 0; z-index: -1;
  background: url("mountains.svg") center bottom / cover no-repeat, #e9edf2;
}
.home main { padding-top: 14vh; }
.home footer {
  border-top: 0;
  color: rgba(255, 255, 255, 0.85);
}
.home footer a { color: #fff; }
@media (prefers-color-scheme: dark) {
  .home .scenery { filter: brightness(0.42) saturate(0.85); }
}

.doc main { padding-top: 56px; }
.doc .back { font-size: 14px; display: inline-block; margin-bottom: 28px; }
.doc .updated { color: var(--muted); font-size: 14px; margin-top: -10px; }
.doc ul { padding-left: 20px; }