:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  margin-left: 24px;
  font-weight: 500;
}

.hero {
  padding: 80px 24px;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 16px;
}

.hero p {
  font-size: 18px;
  color: var(--muted);
  max-width: 700px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.card h3 {
  margin-top: 0;
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: #f1f5f9;
  border-radius: 6px;
}

pre {
  padding: 16px;
  overflow-x: auto;
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 80px;
  padding: 24px;
  color: var(--muted);
  font-size: 14px;
}