:root { --fg: #111; --muted: #6b6b6b; --line: #e8e8e8; --bg: #fff; --accent: #111; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.6 -apple-system, "Segoe UI", Inter, Roboto, sans-serif; }
.nav, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
.nav { display: flex; justify-content: space-between; align-items: center;
  padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.logo { font-weight: 700; text-decoration: none; color: var(--fg); }
nav a { margin-left: 16px; text-decoration: none; color: var(--muted); font-size: 14px; }
nav a:hover { color: var(--fg); }
.btn { display: inline-block; border: 1px solid var(--fg); border-radius: 8px;
  padding: 8px 16px; color: var(--fg); text-decoration: none; font-size: 14px; }
.btn.primary { background: var(--fg); color: #fff; }
.hero { padding: 64px 0 32px; }
.kicker { color: var(--muted); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 12px; }
h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 12px; }
.sub { color: var(--muted); max-width: 56ch; }
.cta { display: flex; gap: 12px; margin: 20px 0; }
.flow { display: flex; align-items: center; gap: 8px; margin: 24px 0 16px; flex-wrap: wrap; }
.pill { border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.arrow { color: var(--muted); }
.code { background: #fafafa; border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; font-size: 13.5px; }
section { padding: 32px 0; border-top: 1px solid var(--line); }
h2 { font-size: 22px; margin: 0 0 16px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.card h3 { margin: 0 0 6px; font-size: 15px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.steps li { margin-bottom: 8px; }
.muted { color: var(--muted); font-size: 14px; }
details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin-bottom: 8px; }
summary { cursor: pointer; font-weight: 600; }
footer { display: flex; justify-content: space-between; border-top: 1px solid var(--line);
  padding-top: 20px; padding-bottom: 40px; font-size: 14px; }
@media (max-width: 560px) { h1 { font-size: 30px; } .grid { grid-template-columns: 1fr; } }