:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --text: #1c1c19;
  --muted: #5d5d55;
  --accent: #2b5a42;
  --border: #dedacd;
  --mark: #ffe9a8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141412;
    --surface: #1d1d1a;
    --text: #f1efe8;
    --muted: #a8a699;
    --accent: #7fc3a0;
    --border: #34332d;
    --mark: #5c4a0d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; padding-bottom: 8px; display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { font: 600 22px/1 Georgia, "Times New Roman", serif; letter-spacing: 0.02em; color: var(--text); text-decoration: none; }
nav { display: flex; gap: 16px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--accent); }
main { padding-top: 16px; padding-bottom: 56px; }
h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; line-height: 1.25; }
h1 { font-size: 34px; margin: 24px 0 8px; }
h2 { font-size: 24px; margin: 36px 0 8px; }
h3 { font-size: 19px; margin: 24px 0 4px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 22px; }
li { margin-bottom: 4px; }
a { color: var(--accent); }
code { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; font-size: 0.9em; }
blockquote { margin: 0 0 14px; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--muted); }
mark { background: var(--mark); color: inherit; padding: 0 3px; border-radius: 3px; }
.table { overflow-x: auto; margin: 0 0 18px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border: 1px solid var(--border); }
th { background: var(--surface); }
.lead { font-size: 21px; color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin: 18px 0; }
.button {
  display: inline-block; background: var(--accent); color: var(--bg); text-decoration: none;
  font-weight: 600; padding: 14px 24px; border-radius: 10px; margin: 6px 8px 6px 0;
}
.button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border); }
footer { padding-top: 24px; padding-bottom: 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }