:root {
  --bg: #0E0E10;
  --surface: #1A1A1E;
  --text: #F5F5F7;
  --muted: #A1A1AA;
  --yellow: #FFD23F;
  --periwinkle: #8FA6FF;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
header { margin-bottom: 36px; }
.mark { display: inline-block; position: relative; width: 64px; height: 44px; margin-bottom: 18px; }
.mark span { position: absolute; width: 40px; height: 40px; border-radius: 50%; }
.mark .b { background: var(--periwinkle); left: 22px; top: 4px; }
.mark .a { background: var(--yellow); left: 0; top: 0; z-index: 1; }
h1 { font-size: 34px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 12px; font-weight: 800; }
h2 { font-size: 20px; margin: 32px 0 8px; font-weight: 700; }
p, li { color: var(--muted); }
p strong, li strong { color: var(--text); font-weight: 600; }
.lede { font-size: 19px; color: var(--text); }
.meta { font-size: 14px; }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
a { color: var(--text); text-decoration-color: rgba(245, 245, 247, 0.35); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--text); }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.08); font-size: 14px; color: var(--muted); }