.signin-page {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    background: radial-gradient(ellipse at 50% 38%, #102331 0, #07121d 35%, var(--night) 75%) !important;
}
.signin-page [hidden] { display: none !important; }
.signin-layout { position: relative; z-index: 2; display: flex; flex: 1; flex-direction: column; align-items: center; justify-content: center; width: min(420px, calc(100% - 40px)); margin-inline: auto; padding-block: 64px 40px; }
.signin-layout > .wordmark { min-height: 44px; margin-bottom: 28px; font-size: 1rem; letter-spacing: 0.035em; }
.signin-layout > .wordmark span, .signin-layout > .wordmark i { animation: none; }
.signin-card { position: relative; width: 100%; padding: 36px; border: 1px solid #2a3b49; border-radius: 12px; background: linear-gradient(145deg, #101f2b, #0b151f); box-shadow: 0 24px 80px #0003; }
.signin-card::before { position: absolute; top: -1px; left: 36px; width: 36px; height: 2px; background: var(--ice); content: ""; }
.signin-card h1 { margin: 0 0 32px; font-size: 2rem; font-weight: 600; letter-spacing: -0.035em; line-height: 1.2; }
.signin-card fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
.signin-card label { display: block; font-size: 0.8rem; font-weight: 600; }
.signin-card input { display: block; width: 100%; min-height: 50px; margin-top: 10px; padding: 12px 14px; border: 1px solid #3a4c5c; border-radius: 6px; background: #07111a; color: var(--ink); font-size: 16px; }
.signin-card input:hover:not(:disabled) { border-color: #627b8b; }
.signin-password-label { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 16px; }
.signin-password-label button { padding: 0; border: 0; background: transparent; color: var(--ice); font-size: 0.72rem; cursor: pointer; min-height: 44px; }
.signin-password-label + input { margin-top: 2px; }
.signin-submit { display: flex; align-items: center; justify-content: space-between; width: 100%; min-height: 50px; padding: 13px 16px; border: 1px solid var(--ice); border-radius: 6px; background: var(--ice); color: #08141c; font-size: 0.9rem; font-weight: 700; cursor: pointer; }
.signin-submit:hover { background: var(--ice-bright); }
.signin-submit:disabled { cursor: not-allowed; opacity: 0.45; }
.signin-card input:disabled { opacity: 0.5; }
.signin-error { margin: 16px 0; color: #ffb6af; font-size: 0.8rem; line-height: 1.5; }
.signin-error:empty { margin-block: 24px; }
.signin-status { margin: 18px 0 0; color: var(--muted); font-size: 0.75rem; line-height: 1.6; }
.signin-demo { margin-top: 4px; font-size: 0.75rem; line-height: 1.6; color: var(--muted); }
.signin-demo summary { width: fit-content; color: var(--ice); cursor: pointer; padding-block: 10px; }
.signin-demo p { margin: 4px 0 0; }
.signin-help { margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--line); text-align: center; font-size: 0.77rem; }
.signin-help a { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; color: var(--muted); text-decoration: none; }
.signin-footer { position: relative; z-index: 2; padding: 8px 20px 24px; color: var(--muted); font-size: 0.72rem; }
.signin-footer nav { display: flex; justify-content: center; gap: 24px; }
.signin-footer a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }
.signin-page a:hover { color: var(--ice-bright); }
.signin-page :focus-visible { outline: 2px solid var(--ice); outline-offset: 4px; }
.signin-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
@media (max-width: 480px) {
    .signin-layout { padding-block: 36px 24px; }
    .signin-layout > .wordmark { margin-bottom: 20px; font-size: 0.9rem; }
    .signin-card { padding: 28px 24px; }
    .signin-card::before { left: 24px; }
    .signin-card h1 { margin-bottom: 28px; font-size: 1.85rem; }
    .signin-footer { padding-bottom: 16px; }
}
@media (prefers-reduced-motion: reduce) {
    .signin-page *, .signin-page *::before { animation: none !important; transition: none !important; }
}