:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172033;
  background: #f7f7fb;
  line-height: 1.6;
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: #5c3dc4; }
a:focus-visible { outline: 3px solid #ffcc66; outline-offset: 3px; }
.shell { width: min(880px, calc(100% - 32px)); margin: 0 auto; }
header { background: #19152b; color: white; padding: 22px 0; }
header a { color: white; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.brand { margin-right: auto; font-size: 1.25rem; font-weight: 750; }
main { background: white; margin: 28px auto 56px; padding: clamp(24px, 5vw, 56px); border-radius: 20px; box-shadow: 0 12px 35px rgba(28, 22, 53, .08); }
h1, h2 { line-height: 1.2; color: #19152b; }
h1 { margin-top: 0; font-size: clamp(2rem, 6vw, 3rem); }
h2 { margin-top: 2.2rem; }
.meta { color: #626b7c; }
.notice { padding: 16px 18px; border-left: 4px solid #7657dc; background: #f4f0ff; border-radius: 8px; }
footer { padding: 0 0 42px; color: #626b7c; }
@media (max-width: 520px) { nav { gap: 12px; } .brand { width: 100%; } }