:root { --accent: #2563eb; --ink: #0f172a; --muted: #475569; --border: #e2e8f0; }

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink); line-height: 1.75; -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

header { padding: 28px 0; border-bottom: 1px solid var(--border); margin-bottom: 40px; }
.brand { font-weight: 800; font-size: 18px; text-decoration: none; color: var(--ink); }
.brand span { color: var(--accent); }

h1 { font-size: 32px; line-height: 1.25; letter-spacing: -0.02em; margin-bottom: 12px; }
.byline { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
h2 { font-size: 22px; margin: 36px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 8px; }
p { margin-bottom: 16px; }
ul, ol { margin: 0 0 16px 24px; }
li { margin-bottom: 8px; }
code { background: #f1f5f9; padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }

.cta {
  margin: 40px 0; padding: 24px; background: #f8fafc;
  border: 1px solid var(--border); border-radius: 12px;
}
.cta a { color: var(--accent); font-weight: 600; text-decoration: none; }
.cta a:hover { text-decoration: underline; }

footer { padding: 24px 0 56px; border-top: 1px solid var(--border); margin-top: 40px; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); }