:root {
  --bg: #ffffff; --bg2: #f4f4f5; --ink: #18181b; --muted: #52525b;
  --line: #e4e4e7; --teal: #0d9488; --teal2: #14b8a6; --maxw: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0c; --bg2: #161618; --ink: #f4f4f5; --muted: #a1a1aa;
    --line: #27272a; --teal: #2dd4bf; --teal2: #5eead4;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.7 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--bg); padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; }
header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 60px; flex-wrap: wrap; gap: 6px 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); }
.brand .logo { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 8px; background: var(--teal); }
nav.learn a { margin-left: 18px; color: var(--muted); font-size: 15px; font-weight: 500; }
nav.learn a:first-child { margin-left: 0; }
nav.learn a:hover { color: var(--teal); }
main { padding: 36px 0 8px; }
h1 { font-size: 34px; line-height: 1.15; font-weight: 800; letter-spacing: -0.02em; margin: 0 0 10px; }
.lede { font-size: 19px; color: var(--muted); margin: 0 0 10px; }
.crumbs { font-size: 14px; color: var(--muted); margin: 0 0 22px; }
.crumbs a { color: var(--muted); }
h2 { font-size: 23px; font-weight: 700; letter-spacing: -0.01em; margin: 36px 0 10px; }
h3 { font-size: 18px; font-weight: 600; margin: 22px 0 6px; }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin: 6px 0; }
strong { font-weight: 600; }
.callout { background: var(--bg2); border: 1px solid var(--line); border-left: 4px solid var(--teal); border-radius: 8px; padding: 16px 18px; margin: 22px 0; }
.cta { display: inline-block; background: var(--teal); color: #fff; font-weight: 600; padding: 11px 18px; border-radius: 10px; margin: 10px 0; }
.cta:hover { text-decoration: none; background: var(--teal2); }
.faq-item { border-top: 1px solid var(--line); padding: 18px 0; }
.faq-item h2, .faq-item h3 { margin: 0 0 8px; }
.morelinks { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 8px; }
.morelinks a { background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; font-weight: 500; color: var(--ink); }
.morelinks a:hover { border-color: var(--teal); text-decoration: none; }
footer.site { border-top: 1px solid var(--line); margin-top: 44px; padding: 24px 0 56px; color: var(--muted); font-size: 14px; }
footer.site a { color: var(--muted); }
footer.site .prog { max-width: 620px; margin: 0 0 10px; }