:root {
  --ink: #14202b;
  --muted: #5b6b7a;
  --line: #e3e8ee;
  --bg: #fafbfc;
  --accent: #1e6fff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

header .brand {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

header h1 {
  font-size: 28px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

header .lede {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
}

h2 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 8px;
  letter-spacing: -0.005em;
}

p, ul, ol { margin: 8px 0 12px; }

ul, ol { padding-left: 20px; }

li { margin: 4px 0; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 111, 255, 0.25);
}

a:hover { border-bottom-color: var(--accent); }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 13.5px;
  background: #eef2f6;
  padding: 1px 6px;
  border-radius: 4px;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

footer a { color: var(--muted); border-bottom-color: transparent; }
footer a:hover { color: var(--ink); border-bottom-color: var(--line); }

.callout {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px 20px;
  margin: 24px 0;
}

.callout p:first-child { margin-top: 0; }
.callout p:last-child  { margin-bottom: 0; }

.badge {
  display: inline-block;
  background: #eaf2ff;
  color: var(--accent);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
}