:root {
  --bg: #0E0D14;
  --sheet: #16151F;
  --ink: #F2F0F7;
  --muted: #9a95ad;
  --accent: #8B7BFF;
  --line: #262435;
}
* { box-sizing: border-box }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Helvetica Neue", Arial, system-ui, sans-serif;
  line-height: 1.62;
}
main { max-width: 720px; margin: 0 auto; padding: 60px 24px 96px }
.mark {
  display: block; width: 40px; height: 40px; margin-bottom: 26px;
  border-radius: 12px; background: var(--accent);
}
h1 { font-weight: 700; letter-spacing: 0.5px; font-size: 34px; margin: 0 0 4px }
.sub {
  color: var(--muted); margin: 0 0 36px; letter-spacing: 3px;
  font-size: 12px; text-transform: uppercase;
}
h2 { font-weight: 700; font-size: 19px; margin: 34px 0 8px }
p, li { color: #c9c4d8 }
strong { color: var(--ink) }
a { color: var(--accent) }
.card {
  background: var(--sheet); border: 1px solid var(--line);
  padding: 18px 22px; margin: 22px 0; border-radius: 10px;
}
.lang {
  color: var(--muted); font-size: 13px; letter-spacing: 2px;
  text-transform: uppercase; border-top: 1px solid var(--line);
  margin-top: 44px; padding-top: 8px;
}
nav { margin-bottom: 30px; font-size: 14px }
nav a { margin-right: 18px }
footer {
  color: var(--muted); font-size: 13px; margin-top: 44px;
  border-top: 1px solid var(--line); padding-top: 22px;
}
@media (prefers-color-scheme: light) {
  :root { --bg:#F7F6FB; --sheet:#FFFFFF; --ink:#14121C; --muted:#645e78;
          --accent:#5B45E0; --line:#e3e0ee }
  p, li { color: #3d3850 }
}