.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  gap: 1rem;
  align-items: center;
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}
.brand-panel h1 { margin: 1rem 0 .4rem; font-size: clamp(2.5rem, 8vw, 5.2rem); line-height: .95; letter-spacing: 0; }
.brand-panel p { color: var(--muted); font-size: 1.15rem; }
.logo-mark {
  display: grid;
  place-items: center;
  width: 64px;
  aspect-ratio: 1;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  font-size: 2rem;
  font-weight: 800;
}
.login-panel form { display: grid; gap: 1rem; }
.login-panel h2 { margin-top: 0; }
@media (max-width: 760px) {
  .auth-shell { grid-template-columns: 1fr; align-content: center; padding: 1rem 0; }
  .brand-panel h1 { font-size: 2.7rem; }
}