:root {
  color-scheme: light dark;
  --ground: #f3f3ef; --surface: #ffffff; --ink: #0d0d0c; --text: #1c1c1a;
  --muted: #5a5a54; --rule: #d8d8d1; --accent: #2d55f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ground: #06080f; --surface: #111a2e; --ink: #eef0f6; --text: #e3e6ee;
    --muted: #98a1b9; --rule: #253052; --accent: #6f8bff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--ground); color: var(--text);
  font: 17px/1.6 ui-rounded, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 2.5rem 1rem 4rem; }
header { display: flex; align-items: center; gap: .75rem; margin-bottom: 2rem; }
header a { color: var(--ink); text-decoration: none; font-weight: 800; font-size: 1.35rem; letter-spacing: -.02em; }
.mark { width: 34px; height: 34px; border-radius: 9px; background: var(--ink); position: relative; }
.mark::after { content: ""; position: absolute; left: 9px; right: 9px; top: 15px; height: 4px; border-radius: 2px; background: var(--accent); }
h1 { font-size: 2.1rem; line-height: 1.15; letter-spacing: -.03em; color: var(--ink); margin: 0 0 .25rem; }
h2 { font-size: 1.2rem; letter-spacing: -.01em; color: var(--ink); margin-top: 2.25rem; }
.updated { color: var(--muted); font-size: .95rem; margin-top: 0; }
.lede { font-size: 1.1rem; }
.card { background: var(--surface); border: 1px solid var(--rule); border-radius: 20px; padding: 1.1rem 1.25rem; margin: 1.25rem 0; }
.card p { margin: 0; }
ul { padding-left: 1.25rem; }
li { margin: .4rem 0; }
a { color: var(--accent); }
nav { margin-top: 3rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .95rem; }
nav a { margin-right: 1rem; }