.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.book-spine-3d.focused{transform:rotate(0) rotateY(0) translateZ(15px) translateY(-8px);z-index:90;outline:3px solid var(--accent-gold);outline-offset:2px;transition:all .2s ease}.book-spine-3d.focused .spine-face{box-shadow:inset 0 0 15px #00000026,3px 8px 20px #0000004d,0 0 12px #d4af3740}.book-spine-3d.focused:hover{z-index:100}.toast-notification{position:fixed;bottom:20px;right:20px;padding:1rem 1.5rem;border-radius:8px;background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(0,0,0,.1);box-shadow:0 4px 20px #00000026;display:flex;align-items:center;gap:.75rem;z-index:10001;animation:slideIn .3s ease-out;color:var(--text-main)}.toast-notification.success{background:#4caf50f2;color:#fff}.toast-notification.error{background:#f44336f2;color:#fff}.toast-notification.info{background:#2196f3f2;color:#fff}@keyframes slideIn{0%{transform:translate(400px);opacity:0}to{transform:translate(0);opacity:1}}@keyframes fadeOut{to{opacity:0;transform:translate(400px)}}@media (prefers-reduced-motion: no-preference){.book-spine-3d.focused{scroll-behavior:smooth}}