body { margin: 0; background: #f5f7fa; color: #17212b; font: 17px/1.65 system-ui, sans-serif; }
main { max-width: 760px; margin: 40px auto 100px; padding: 28px; background: #fff; border: 1px solid #dde3e9; border-radius: 12px; }
h1 { line-height: 1.2; font-size: 30px; }
a { color: #12578b; }
.site { font-size: 14px; }
button { padding: 12px 16px; border: 1px solid #546273; border-radius: 8px; background: #f5f7f9; color: #17212b; font: inherit; cursor: pointer; }
button:focus-visible, a:focus-visible { outline: 3px solid #1769aa; outline-offset: 3px; }
[hidden] { display: none !important; }
@media (max-width: 600px) { main { margin: 16px 12px 90px; padding: 20px; } }