:root {
  --bg: #f4f7fa;
  --text: #0b1a26;
  --muted: #3d5263;
  --card: #ffffff;
  --accent: #006da3;
  --line: #d5e0e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #050f18;
    --text: #eef4f8;
    --muted: #b4c5d2;
    --card: #0b2233;
    --accent: #3fc6ff;
    --line: #1c3a50;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header .badge {
  width: 52px; height: 52px; border-radius: 12px; flex: none;
  background: linear-gradient(#063a5e, #021a2b);
  display: grid; place-items: center;
}
header .badge span { display: block; width: 26px; height: 5px; border-radius: 3px; background: #00b5f2; box-shadow: 0 -9px 0 -1px #7a99ad, 0 9px 0 -1px #7a99ad; }
header p { margin: 0; color: var(--muted); font-size: 15px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0; }
h2 { font-size: 20px; margin: 32px 0 8px; }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 20px; margin: 16px 0; }
.muted { color: var(--muted); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer a { margin-right: 14px; }