:root {
  --bg: #0d1117;
  --panel: #161b22;
  --ink: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --line: #30363d;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: var(--bg); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  padding: 24px;
}
main {
  max-width: 640px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; padding: 28px 32px;
}
h1 { font-size: 24px; margin: 0 0 14px; line-height: 1.3; }
h2 { font-size: 16px; margin: 22px 0 8px; }
a { color: var(--accent); }
code {
  font-family: ui-monospace, Consolas, monospace; font-size: 14px;
  background: #21262d; border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px;
}
ul { margin: 0; padding-left: 22px; }
li { margin: 8px 0; }
.small { color: var(--muted); font-size: 13px; margin: 22px 0 0; }