:root { color-scheme: dark; font: 16px/1.5 system-ui, sans-serif; background: #0b1020; color: #e6edf7; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 24px; }
main { width: 100%; max-width: 420px; padding: 36px; border: 1px solid #303b55; border-radius: 18px; background: #141d30; box-shadow: 0 20px 60px #0004; }
.brand { margin: 0 0 30px; color: #9cafff; font-weight: 650; letter-spacing: .02em; }
h1 { font-size: 30px; margin: 0 0 8px; }
.intro { color: #b1bfd4; margin: 0 0 24px; }
.error { color: #ffb8b8; }
.error:empty { display: none; }
label { display: block; font-weight: 600; margin-bottom: 7px; }
input, button { font: inherit; border-radius: 8px; width: 100%; min-height: 46px; }
input { background: #0b1020; color: #e6edf7; border: 1px solid #52617d; padding: 10px 12px; margin-bottom: 20px; }
input:focus-visible, button:focus-visible { outline: 3px solid #9cafff; outline-offset: 3px; }
button { border: 0; background: #a9baff; color: #0b1020; font-weight: 700; cursor: pointer; margin-top: 6px; }
button:hover { background: #c4d0ff; }
@media (max-width: 420px) { main { padding: 26px; } }