.version-switcher{position:fixed;bottom:20px;right:20px;z-index:1000;display:flex;flex-direction:column;gap:8px}.version-switch-btn{background:#007affe6;color:#fff;border:none;padding:8px 12px;border-radius:20px;font-size:12px;font-weight:500;cursor:pointer;transition:all .3s ease;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 2px 8px #007aff4d;min-width:80px;text-align:center}.version-switch-btn:hover{background:#007aff;transform:translateY(-1px);box-shadow:0 4px 12px #007aff66}.version-switch-btn:active{transform:translateY(0)}@media (max-width: 768px){.version-switcher{bottom:15px;right:15px}.version-switch-btn{padding:6px 10px;font-size:11px;min-width:70px}}@media (prefers-color-scheme: dark){.version-switch-btn{background:#ffffff1a;color:#fff;border:1px solid rgba(255,255,255,.2)}.version-switch-btn:hover{background:#fff3;border-color:#ffffff4d}}.version-switcher.hidden{display:none}.version-switcher{animation:fadeInUp .5s ease-out}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}