:root {
  color-scheme: light dark;
  --background: #f5f7fa;
  --surface: #fff;
  --text: #1d2633;
  --link: #175ba8;
  --line: #ccd5df;
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #10151e;
    --surface: #19212e;
    --text: #e6ebf3;
    --link: #95c9ff;
    --line: #4a586d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 1rem/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-wrap: anywhere;
}
header, main, footer { width: min(100% - 2rem, 52rem); margin-inline: auto; }
header { padding-block: 2rem; display: flex; gap: 1rem 2rem; justify-content: space-between; flex-wrap: wrap; }
.brand { font-weight: 750; }
nav { display: flex; gap: .5rem 1.5rem; flex-wrap: wrap; }
a { color: var(--link); text-underline-offset: .2em; }
nav a { padding-block: .5rem; }
a:focus-visible { outline: 3px solid var(--link); outline-offset: 4px; border-radius: 2px; }
article { padding: clamp(1rem, 4vw, 3rem); background: var(--surface); border: 1px solid var(--line); border-radius: 1rem; }
h1 { margin-top: 0; font-size: clamp(1.9rem, 5vw, 2.8rem); line-height: 1.15; letter-spacing: -.025em; }
h2 { margin-top: 2rem; font-size: 1.35rem; line-height: 1.35; }
li + li { margin-top: .75rem; }
ul, ol { padding-left: 1.4rem; }
blockquote { margin-inline: 0; padding-left: 1rem; border-left: 3px solid var(--line); }
code { font-size: .9em; }
footer { padding-block: 2rem; }
.skip { position: absolute; left: 1rem; top: -5rem; padding: .5rem 1rem; background: var(--surface); }
.skip:focus { top: .5rem; }