:root {
  --bg: #ffffff; --fg: #1a1a1a; --muted: #5c5c5c;
  --line: #e2e2e2; --accent: #c2410c; --card: #fafafa;
  --warn-bg: #fff7ed; --warn-line: #fdba74;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121212; --fg: #ececec; --muted: #a0a0a0;
          --line: #2e2e2e; --accent: #fb923c; --card: #1c1c1c;
          --warn-bg: #2a1a0d; --warn-line: #7c3d12; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
       padding: 2.5rem 1.25rem; }
main { max-width: 46rem; margin: 0 auto; }
h1 { font-size: 1.85rem; line-height: 1.25; margin: 0 0 .35rem; }
h2 { font-size: 1.2rem; margin: 2.25rem 0 .6rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 .4rem; }
.sub { color: var(--muted); margin: 0 0 2rem; }
a { color: var(--accent); }
nav { margin: 0 0 2rem; font-size: .9rem; }
nav a { margin-right: 1rem; }
.card { background: var(--card); border: 1px solid var(--line);
        border-radius: 10px; padding: 1.1rem 1.25rem; margin: 1rem 0; }
.notice { background: var(--warn-bg); border: 1px solid var(--warn-line);
          border-radius: 10px; padding: 1.1rem 1.25rem; margin: 1rem 0; }
ol, ul { padding-left: 1.35rem; }
li { margin: .4rem 0; }
table { border-collapse: collapse; width: 100%; margin: .75rem 0; font-size: .95rem; }
th, td { text-align: left; padding: .6rem .5rem; border-bottom: 1px solid var(--line);
         vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
code { background: var(--card); border: 1px solid var(--line);
       border-radius: 4px; padding: .1rem .35rem; font-size: .9em; }
footer { margin-top: 3rem; padding-top: 1.25rem; border-top: 1px solid var(--line);
         color: var(--muted); font-size: .9rem; }