:root {
  --bg: #0b0f17;
  --panel: #121826;
  --text: #e7ecf3;
  --muted: #9aa6b8;
  --accent: #7c9cff;
  --line: #222b3d;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f7f8fb; --panel: #ffffff; --text: #141a26; --muted: #5a6577; --accent: #3b5bdb; --line: #e3e7ee; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brand { font-weight: 700; letter-spacing: .02em; color: var(--text); text-decoration: none; font-size: 19px; }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
main { padding: 56px 0 72px; }
h1 { font-size: 40px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -.01em; }
h2 { font-size: 22px; margin: 40px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p, li { color: var(--text); }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 28px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; margin: 22px 0; }
.note { border-left: 3px solid var(--accent); }
.meta { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
ul { padding-left: 22px; }
footer { border-top: 1px solid var(--line); padding: 22px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }
@media (max-width: 560px) {
  h1 { font-size: 32px; }
  header .wrap { height: auto; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
  nav a { margin: 0 14px 0 0; }
}