:root { --max: 780px; }
* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin: 0; }
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 16px; line-height: 1.6; }
header { padding-top: 32px; }
nav a { margin-right: 12px; }
h1, h2, h3 { line-height: 1.25; }
code, pre { background: #f6f8fa; padding: 2px 6px; border-radius: 6px; }
.card { background: #fff; border: 1px solid #e5e7eb; border-radius: 12px; padding: 16px; margin: 12px 0; }
.muted { color: #6b7280; font-size: 0.95em; }
footer { color: #6b7280; font-size: 0.9em; padding-bottom: 48px; }
details { background: #fafafa; border-radius: 10px; padding: 10px 12px; border: 1px solid #eee; margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }
a.button { display:inline-block; padding:10px 14px; border:1px solid #e5e7eb; border-radius:10px; text-decoration:none; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }