.scroll-top{position:fixed;bottom:2rem;right:2rem;width:48px;height:48px;border:none;border-radius:50%;background:var(--primary-color);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #3b82f64d;transition:all .3s ease;z-index:1000}.scroll-top:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 6px 20px #3b82f666}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#fffc;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:9999}.loading{width:40px;height:40px;border:3px solid var(--border-color);border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (max-width: 768px){.scroll-top{width:44px;height:44px;bottom:1.5rem;right:1.5rem}}