:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1c1e21;
  --muted: #5b6270;
  --line: #e6e8ec;
  --accent: #2b6cff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a20;
    --ink: #e8eaed;
    --muted: #9aa2b1;
    --line: #262a32;
    --accent: #6ea0ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 20px;
}
.wrap { max-width: 680px; margin: 0 auto; padding: 72px 0 96px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 48px; }
.mark {
  width: 40px; height: 40px; border-radius: 10px; flex: none;
  background: linear-gradient(180deg, #33384a, #10131a);
  display: grid; place-items: center;
}
.mark svg { width: 22px; height: 22px; fill: #fff; }
.brand { font-weight: 600; font-size: 18px; letter-spacing: -0.01em; }
h1 { font-size: 30px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 19px; letter-spacing: -0.01em; margin: 36px 0 10px; }
p, li { color: var(--ink); }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 8px; }
.muted { color: var(--muted); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 28px 30px; margin-top: 24px;
}
ul { padding-left: 20px; }
li { margin: 6px 0; }
.updated { font-size: 14px; color: var(--muted); margin-top: 8px; }
footer.site {
  margin-top: 56px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; color: var(--muted);
}
.btn {
  display: inline-block; margin-top: 20px; padding: 11px 18px; border-radius: 10px;
  background: var(--accent); color: #fff; font-weight: 600;
}
.btn:hover { text-decoration: none; opacity: 0.92; }