/* The app's sky and navy, set for reading: one column, generous line height. */
:root {
  --ink: #0b2541;
  --ink-soft: #4a5d73;
  --line: #d9e8f5;
  --sky: #4dc1ff;
  --link: #1a7fc0;
  --ground: #f5faff;
  --paper: #ffffff;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8f2fb;
    --ink-soft: #9fb3c8;
    --line: #22364d;
    --link: #7fd3ff;
    --ground: #0a1826;
    --paper: #0f2135;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 16px;
}
main {
  max-width: 720px;
  margin: 32px auto 48px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px clamp(20px, 5vw, 48px) 24px;
}
header { border-bottom: 1px solid var(--line); padding-bottom: 20px; margin-bottom: 24px; }
.brand {
  display: inline-block;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 3px solid var(--sky);
  margin-bottom: 16px;
}
h1 { font-size: clamp(28px, 6vw, 36px); line-height: 1.15; margin: 0 0 6px; text-wrap: balance; }
h2 { font-size: 20px; line-height: 1.3; margin: 32px 0 8px; text-wrap: balance; }
p, ul, address { margin: 0 0 14px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
address { font-style: normal; padding: 14px 16px; border-left: 3px solid var(--sky); background: var(--ground); border-radius: 0 10px 10px 0; }
.meta { color: var(--ink-soft); font-size: 15px; margin: 0; }
.lead { font-size: 18px; }
a { color: var(--link); text-underline-offset: 2px; }
.toc { background: var(--ground); border-radius: 12px; padding: 12px 16px; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 22px; columns: 2 220px; column-gap: 24px; }
.toc li { margin: 2px 0; break-inside: avoid; }
footer {
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 15px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}