:root {
  --bg: #0b0d10;
  --surface: #14171c;
  --text: #e8eaee;
  --text-dim: #a4a9b3;
  --accent: #6aa8ff;
  --border: #232830;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 1;
}

header.site .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

header.site a.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
}

header.site nav a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}

header.site nav a:hover {
  color: var(--accent);
}

h1 { font-size: 32px; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 22px; margin: 32px 0 8px; letter-spacing: -0.005em; }
h3 { font-size: 18px; margin: 24px 0 6px; }
p, li { color: var(--text); }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }
a { color: var(--accent); }

.meta {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 24px;
}

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 20px 0;
  color: var(--text-dim);
  font-size: 15px;
}

.hero {
  text-align: center;
  padding: 64px 0 32px;
}

.hero h1 { font-size: 44px; }
.hero p.lede {
  font-size: 19px;
  color: var(--text-dim);
  max-width: 540px;
  margin: 12px auto 0;
}

.features {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  margin: 32px 0;
}

@media (min-width: 640px) {
  .features { grid-template-columns: 1fr 1fr; }
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.feature h3 { margin-top: 0; }

footer.site {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

footer.site a { color: var(--text-dim); margin: 0 8px; }