:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --surface: #ffffff;
  --label: #1d1d1f;
  --label-2: #6e6e73;
  --line: rgba(0, 0, 0, 0.08);
  --blue: #0071e3;
  --mark: #fff3bf;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --label: #f5f5f7;
    --label-2: #a1a1a6;
    --line: rgba(255, 255, 255, 0.1);
    --blue: #2997ff;
    --mark: #5c4a00;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--label);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.top {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: max(12px, env(safe-area-inset-top)) 20px 12px;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.top a { color: var(--blue); text-decoration: none; font-weight: 500; }
.top span { margin-left: auto; font-weight: 600; letter-spacing: -0.01em; }
main { max-width: 720px; margin: 0 auto; padding: 28px 20px 64px; }
.eyebrow { margin: 0; color: var(--label-2); font-size: 14px; font-weight: 600; letter-spacing: 0.02em; text-transform: uppercase; }
h1 { margin: 6px 0 4px; font-size: clamp(30px, 7vw, 40px); line-height: 1.1; letter-spacing: -0.03em; }
.updated { margin: 0 0 24px; color: var(--label-2); font-size: 14px; }
section {
  margin: 14px 0;
  padding: 18px 20px;
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
h2 { margin: 0 0 6px; font-size: 19px; letter-spacing: -0.02em; }
p, li { color: var(--label); }
ul { margin: 6px 0; padding-left: 20px; }
li { margin: 4px 0; }
a { color: var(--blue); }
mark { background: var(--mark); color: inherit; padding: 0 3px; border-radius: 4px; }
.note { color: var(--label-2); font-size: 14px; }