body { min-height: 100vh; background: #f5f5f5; display: flex; align-items: center; justify-content: center; padding: 1.5rem; }
.auth-shell { width: 100%; max-width: 440px; }
.auth-logo { text-align: center; margin-bottom: 1.5rem; }
.auth-logo img { max-height: 40px; }