:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #151b23;
  --panel-2: #1c2430;
  --text: #f4f7fb;
  --muted: #b7c0cc;
  --accent: #7cc7ff;
  --accent-2: #b4e2ff;
  --border: #303b49;
  --max: 74rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: linear-gradient(180deg, #0d1117 0%, #101620 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--accent); }
a:hover { color: var(--accent-2); }
header, main, footer { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
header { padding: 1.2rem 0; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: var(--text); font-weight: 800; letter-spacing: .08em; text-decoration: none; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; }
.hero { padding: 5rem 0 3rem; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; }
h1, h2, h3 { line-height: 1.2; }
h1 { font-size: clamp(2.4rem, 6vw, 4.8rem); max-width: 14ch; margin: .5rem 0 1rem; }
h2 { margin-top: 2.4rem; font-size: clamp(1.55rem, 3vw, 2.2rem); }
h3 { margin-top: 1.7rem; }
.lede { max-width: 68ch; color: var(--muted); font-size: 1.15rem; }
.actions { margin-top: 1.7rem; display: flex; gap: .8rem; flex-wrap: wrap; }
.button { display: inline-block; padding: .75rem 1rem; border-radius: .6rem; border: 1px solid var(--border); text-decoration: none; font-weight: 700; }
.button.primary { background: var(--accent); color: #06111a; border-color: var(--accent); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: .9rem; padding: 1.15rem; }
.card h3 { margin-top: 0; }
.callout { background: var(--panel-2); border-left: .25rem solid var(--accent); padding: 1rem 1.2rem; border-radius: .35rem; margin: 1.5rem 0; }
main { padding-bottom: 4rem; }
ul, ol { padding-left: 1.35rem; }
li + li { margin-top: .35rem; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }
footer { border-top: 1px solid var(--border); color: var(--muted); padding: 1.5rem 0 2.5rem; }
.small { font-size: .92rem; color: var(--muted); }
code { background: var(--panel); border: 1px solid var(--border); padding: .12rem .35rem; border-radius: .3rem; }
@media (max-width: 42rem) {
  header { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 3rem; }
}