:root {
  --brain-navy: #07507c;
  --brain-ink: #15334a;
  --brain-cyan: #30b6d9;
  --brain-paper: #f4f7fa;
  --brain-border: #d9e5ec;
}
.brain-signin { margin: 0; min-height: 100vh; min-height: 100dvh; display: grid; place-items: center; box-sizing: border-box; padding: 32px 20px; background: var(--brain-paper); color: var(--brain-ink); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
.brain-signin * { box-sizing: border-box; }
.brain-card { width: min(100%, 480px); background: white; padding: 40px; border: 1px solid var(--brain-border); border-radius: 20px; box-shadow: 0 16px 48px #15334a0a; animation: brain-arrive 260ms ease-out both; }
.brain-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--brain-navy); font-size: 22px; font-weight: 750; line-height: 1.2; text-decoration: none; }
.brain-brand img { display: block; object-fit: contain; }
.brain-brand-sub { display: block; margin-top: 4px; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; }
.brain-eyebrow { margin: 32px 0 10px; color: #42657b; font-size: 11px; font-weight: 650; text-transform: uppercase; letter-spacing: .13em; }
.brain-card h1 { margin: 0; font-size: clamp(28px, 7vw, 36px); font-weight: 650; line-height: 1.15; letter-spacing: -.035em; }
.brain-description { color: #496578; margin: 18px 0 26px; }
.brain-button { display: flex; width: 100%; min-height: 50px; align-items: center; justify-content: center; gap: 14px; padding: 13px 18px; border: 1px solid var(--brain-navy); border-radius: 10px; background: var(--brain-navy); color: white; text-decoration: none; font: 650 15px/1.4 system-ui, sans-serif; cursor: pointer; transition: background 160ms ease, transform 160ms ease; }
.brain-button:hover { color: white; background: #063c5d; transform: translateY(-1px); text-decoration: none; }
.brain-signin a:focus-visible, .brain-button:focus-visible { outline: 3px solid var(--brain-cyan); outline-offset: 4px; }
.brain-footer { margin: 28px 0 0; font-size: 12px; color: #567183; text-align: center; }
.brain-footer a { color: var(--brain-navy); text-underline-offset: 3px; }
/* Elastic retains its icon font and responsive layout; only brand surfaces change. */
html:not(.dark-mode) #layout-menu { background: var(--brain-navy); }
html:not(.dark-mode) #layout-menu .popover-header, html:not(.dark-mode) #layout-menu .special-buttons { background-color: var(--brain-navy); }
html:not(.dark-mode) #layout-menu .button-selected { background-color: #ffffff20; }
html:not(.dark-mode) .btn-primary { background-color: var(--brain-navy); border-color: var(--brain-navy); }
html:not(.dark-mode) .btn-primary:hover { background-color: #063c5d; border-color: #063c5d; }
#layout-menu #logo { padding: 8px; border-radius: 12px; background: #fff; object-fit: contain; }
@keyframes brain-arrive { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 480px) { .brain-card { padding: 28px 22px; border-radius: 16px; } .brain-signin { padding: 20px 16px; } .brain-brand { font-size: 21px; } .brain-brand img { width: 52px; height: 52px; } .brain-footer { line-height: 1.8; } }
@media (prefers-reduced-motion: reduce) { .brain-card { animation: none; } .brain-button { transition: none; } .brain-button:hover { transform: none; } }