:root {
  color-scheme: light dark;
  --background: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.9);
  --text: #182033;
  --muted: #566079;
  --accent: #4b56c0;
  --line: #dce1ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #10131c;
    --surface: rgba(27, 31, 45, 0.94);
    --text: #f3f5ff;
    --muted: #b8bfd4;
    --accent: #aeb7ff;
    --line: #353b50;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top, color-mix(in srgb, var(--accent) 13%, var(--background)), var(--background) 38rem);
  color: var(--text);
  font: 17px/1.62 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

header, article, .card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 18px 48px rgba(20, 27, 54, 0.09);
}

header { padding: 32px; margin-bottom: 18px; }
article, .card { padding: 30px 32px; }
.card + .card { margin-top: 16px; }

.eyebrow {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 { margin: 5px 0 8px; font-size: clamp(2rem, 7vw, 3.25rem); line-height: 1.05; }
h2 { margin: 2rem 0 0.5rem; font-size: 1.35rem; line-height: 1.25; }
h2:first-child { margin-top: 0; }
p, ul { margin: 0.55rem 0 1rem; }
.muted, footer { color: var(--muted); }
a { color: var(--accent); text-underline-offset: 0.18em; }
nav { display: flex; flex-wrap: wrap; gap: 12px 18px; margin-top: 20px; }
nav a { font-weight: 650; }
footer { padding: 24px 4px 0; font-size: 0.9rem; text-align: center; }

@media (max-width: 520px) {
  main { padding-top: 24px; }
  header, article, .card { padding: 24px 22px; border-radius: 18px; }
}