:root {
  --bg: #f6f8f9;
  --card: #ffffff;
  --text: #0e1a20;
  --muted: #55646c;
  --line: #dbe3e7;
  --accent: #0f7b8a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b141a;
    --card: #12202a;
    --text: #eaf2f5;
    --muted: #9fb1ba;
    --line: #223540;
    --accent: #5fd0e0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.3px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:hover { color: var(--accent); }
main { padding-top: 24px; padding-bottom: 40px; }
article { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 24px 22px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.5px; }
h2 { font-size: 19px; margin: 28px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 14px; }
ul { padding-left: 22px; }
a { color: var(--accent); }
footer { padding-bottom: 40px; color: var(--muted); font-size: 13px; }
.lang { font-size: 14px; margin: 0 0 14px; }
.cta { display: inline-block; margin-top: 8px; padding: 11px 18px; border-radius: 999px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 700; }
@media (prefers-color-scheme: dark) { .cta { color: #03080c; } }