:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --card: #f5f5f7;
  --accent: #0a84ff;
  --line: #d2d2d7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --card: #1c1c1e;
    --accent: #0a84ff;
    --line: #38383a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
h1 { font-size: 32px; line-height: 1.15; margin: 0; }
h2 { font-size: 21px; margin: 36px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
nav { display: flex; gap: 18px; margin: 18px 0 28px; flex-wrap: wrap; }
.card { background: var(--card); border-radius: 16px; padding: 18px 20px; margin: 14px 0; }
.card h3 { margin: 0 0 4px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); }
ul { padding-left: 22px; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.button { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 12px; font-weight: 600; }
.button:hover { text-decoration: none; opacity: .9; }
.card h3.app { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.card h3.app img { width: 40px; height: 40px; border-radius: 9px; }
footer { display: flex; flex-wrap: wrap; gap: 28px 48px; }
.foot-col { display: flex; flex-direction: column; gap: 6px; min-width: 150px; }
.foot-col strong { color: var(--text); font-size: 14px; }
.foot-note { flex-basis: 100%; margin: 8px 0 0; }