:root {
  --bg: #ffffff;
  --text: #16181d;
  --muted: #5d6270;
  --line: #e6e7eb;
  --card: #f6f5f1;
  --accent: #2549d6;
  --accent-text: #1d3bb0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --text: #f2f3f5;
    --muted: #a3a8b4;
    --line: #2a2d34;
    --card: #1b1e24;
    --accent: #4a6cf0;
    --accent-text: #a9b8ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 18px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 72px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
header a { color: inherit; text-decoration: none; }
h1 { font-size: 34px; line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 40px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 24px 0 4px; }
p, li { color: var(--text); }
.lead { font-size: 21px; color: var(--muted); margin: 0 0 24px; }
.muted { color: var(--muted); }
a { color: var(--accent-text); }
.card { background: var(--card); border-radius: 16px; padding: 20px 22px; margin: 16px 0; }
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.button {
  display: inline-block; background: var(--accent); color: #fff; text-decoration: none;
  font-weight: 600; padding: 12px 20px; border-radius: 12px;
}
footer { border-top: 1px solid var(--line); margin-top: 56px; padding-top: 20px; font-size: 15px; color: var(--muted); }
footer a { color: var(--muted); }