:root {
  --bg: #fbfbfd;
  --fg: #1d1d1f;
  --muted: #86868b;
  --accent: #6b47c9;
  --border: #e8e8ed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 64px 24px 32px;
  background: linear-gradient(135deg, #6b47c9, #4a2a8c);
  color: white;
}

header h1 {
  margin: 0 0 8px;
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -1px;
}

header .lead {
  margin: 0;
  font-size: 18px;
  opacity: 0.9;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin: 0 0 12px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul,
ol {
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 24px;
  margin-top: 48px;
}

.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.doc h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

.doc .meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 32px;
}

.doc h2 {
  margin-top: 32px;
}

.doc p,
.doc li {
  font-size: 15px;
}

.back {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 13px;
}