:root {
  color-scheme: light;
  --ink: #182633;
  --muted: #465564;
  --blue: #176fca;
  --purple: #713ccb;
  --paper: #fffef9;
  --line: #dbe5ec;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 5%, rgba(62,180,255,.15), transparent 30rem),
    radial-gradient(circle at 90% 15%, rgba(147,72,255,.13), transparent 28rem),
    #f7faf9;
  font-size: 18px;
  line-height: 1.6;
}
header, main, footer { width: min(880px, calc(100% - 32px)); margin-inline: auto; }
header { padding: 46px 0 26px; display: flex; gap: 20px; align-items: center; }
.logo { width: 96px; height: 96px; border-radius: 23px; box-shadow: 0 12px 28px rgba(39,64,113,.18); }
h1 { margin: 0; font-size: clamp(2rem, 7vw, 3.25rem); line-height: 1.06; letter-spacing: -.035em; }
.tagline { color: var(--muted); margin: 8px 0 0; font-size: 1.1rem; }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 26px; }
nav a, .button {
  display: inline-block; padding: 10px 17px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line); color: #25415b;
  text-decoration: none; font-weight: 700;
}
nav a[aria-current="page"] { color: #fff; border-color: transparent; background: linear-gradient(135deg,var(--blue),var(--purple)); }
.card {
  background: rgba(255,255,255,.92); border: 1px solid var(--line);
  border-radius: 24px; padding: clamp(22px, 5vw, 38px); margin-bottom: 22px;
  box-shadow: 0 12px 34px rgba(39,64,113,.08);
}
h2 { font-size: 1.65rem; line-height: 1.2; margin: 0 0 14px; }
h3 { font-size: 1.15rem; margin: 22px 0 5px; }
p, li { color: var(--muted); }
strong { color: var(--ink); }
.note { border-left: 5px solid #54b7ca; padding: 4px 0 4px 16px; }
ul { padding-left: 1.35rem; }
footer { padding: 20px 0 44px; color: var(--muted); font-size: .9rem; }
@media (max-width: 520px) {
  body { font-size: 17px; }
  header { align-items: flex-start; padding-top: 28px; }
  .logo { width: 74px; height: 74px; border-radius: 18px; }
}