:root { color-scheme: light; }
body {
  margin: 0;
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1c2530;
  background: #f7f9fb;
}
header.site, main, footer.site { max-width: 720px; margin: 0 auto; padding: 0 1rem; }
header.site { padding-top: 1rem; padding-bottom: 0.5rem; }
.brand { font-size: 1.4rem; font-weight: 700; color: #0b5c6b; text-decoration: none; }
main { padding-top: 1rem; padding-bottom: 2rem; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 1rem 0; }
h2 { font-size: 1.3rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
a { color: #0b5c6b; }
a:focus-visible { outline: 3px solid #0b5c6b; outline-offset: 2px; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border: 1px solid #c5ced6; padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
th { background: #e8eef2; }
mark.todo { background: #fff3a3; color: #1c2530; padding: 0 0.2em; }
.note { background: #e8eef2; border-left: 4px solid #0b5c6b; padding: 0.6rem 1rem; }
footer.site { border-top: 1px solid #c5ced6; padding-top: 1rem; padding-bottom: 2rem; font-size: 0.9rem; color: #3d4a57; }