:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: #f3f5f8; color: #182339; }
main { width: min(420px, calc(100vw - 96px)); padding: 40px; border: 1px solid #e1e6ef; border-radius: 18px; background: white; }
.brand { color: #5278c5; font-size: 13px; font-weight: 700; letter-spacing: 3px; }
h1 { font-size: 26px; font-weight: 600; }
p { line-height: 1.8; color: #596578; }
a { display: inline-block; margin-top: 18px; padding: 11px 22px; border-radius: 8px; background: #2759ad; color: white; text-decoration: none; }
a:focus-visible { outline: 3px solid #89aaf0; outline-offset: 3px; }
@media (prefers-color-scheme: dark) { body { background: #121821; color: #e1e8f1; } main { background: #1b2533; border-color: #334154; } p { color: #b5c1d2; } }