/* Go to Top Button */
.go-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    color: #000;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 1000;
    box-shadow: 
        0 4px 20px rgba(0, 0, 0, 0.1),
        0 2px 8px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    mix-blend-mode: difference;
}

.go-to-top:hover {
    transform: translateY(0) scale(1.05);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 4px 12px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.go-to-top:active {
    transform: translateY(0) scale(0.95);
}

/* Click Animation */
@keyframes ripple {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}

@keyframes buttonPulse {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-5px) scale(1.1);
    }
}

.go-to-top.clicked {
    animation: buttonPulse 0.4s ease;
}

.go-to-top::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
}

.go-to-top.clicked::before {
    animation: ripple 0.6s ease-out;
}

.go-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.go-to-top svg {
    width: 24px;
    height: 24px;
}

/* Responsive */
@media (max-width: 768px) {
    .go-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }

    .go-to-top svg {
        width: 20px;
        height: 20px;
    }
}