:root {
  --bg: #0f172a;
  --fg: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --card: #1e293b;
  --border: #334155;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.brand { font-weight: 700; font-size: 1.25rem; color: var(--fg); }
nav a { margin-left: 1.25rem; color: var(--muted); }
nav a:hover { color: var(--fg); }
main { flex: 1; padding: 3rem 2rem; max-width: 900px; margin: 0 auto; width: 100%; }
h1 { font-size: 2.25rem; margin: 0 0 1rem; }
h2 { font-size: 1.5rem; margin: 2rem 0 0.5rem; }
p { color: var(--muted); }
.hero { padding: 2rem 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  color: var(--muted);
  font-size: 0.875rem;
  text-align: center;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #0f172a;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  margin-top: 1rem;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
ul { color: var(--muted); }
code { background: var(--card); padding: 0.15rem 0.4rem; border-radius: 4px; font-size: 0.9em; }