:root {
  --paper: #f4efe4;
  --ink: #1d1b19;
  --muted: #6b655c;
  --line: #d9d0bf;
  --accent: #ff4f9a;
  --blue: #2f4bb3;
  --card: #fbf8f1;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #171614;
    --ink: #ece6da;
    --muted: #a39b8d;
    --line: #34302a;
    --card: #1f1d1a;
    --blue: #8ea2ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--blue); text-underline-offset: 3px; }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }
header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap; }
.mark { font: 700 20px/1 "IBM Plex Mono", ui-monospace, monospace; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; }
.mark span { background: linear-gradient(transparent 55%, var(--accent) 55%); }
nav a { color: var(--ink); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a:hover { text-decoration: underline; }
.hero { padding: 56px 0 28px; }
.hero h1 { font: 700 clamp(32px, 6vw, 52px)/1.08 "IBM Plex Sans", system-ui, sans-serif; letter-spacing: -0.02em; margin: 0 0 18px; max-width: 16ch; }
.hero p { font-size: 19px; color: var(--muted); max-width: 60ch; margin: 0; }
section { padding: 28px 0; border-top: 1px solid var(--line); }
h2 { font: 600 13px/1 "IBM Plex Mono", ui-monospace, monospace; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 18px; }
h3 { margin: 0 0 4px; font-size: 20px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.card .meta { font: 500 13px/1.4 "IBM Plex Mono", ui-monospace, monospace; color: var(--muted); margin-bottom: 10px; }
.card p { margin: 8px 0 12px; }
ul.points { padding-left: 20px; margin: 0; }
ul.points li { margin: 6px 0; }
.doc h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; margin: 48px 0 8px; }
.doc .updated { color: var(--muted); font-size: 15px; margin-bottom: 28px; }
.doc h2 { margin-top: 32px; }
.doc p, .doc li { max-width: 70ch; }
footer { border-top: 1px solid var(--line); padding: 28px 0 48px; color: var(--muted); font-size: 14px; margin-top: 40px; }
footer a { color: var(--muted); }
@media (max-width: 560px) {
  nav a { margin-left: 12px; font-size: 14px; }
  .hero { padding-top: 36px; }
}