/* Back to Top Button - Matrix Theme */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #000000;
    border: 2px solid #00ff41;
    border-radius: 50%;
    color: #00ff41;
    font-size: 20px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.3);
    text-decoration: none;
}

.back-to-top.show {
    display: flex;
    animation: fadeInUp 0.3s ease-out;
}

.back-to-top:hover {
    background-color: #00ff41;
    color: #000000;
    box-shadow: 0 0 25px #00ff41, 0 0 50px rgba(0, 255, 65, 0.5);
    transform: translateY(-5px) scale(1.1);
    border-color: #00ffaa;
}

.back-to-top:active {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 0 20px #00ff41;
}

.back-to-top svg {
    filter: drop-shadow(0 0 5px #00ff41);
    transition: transform 0.3s;
}

.back-to-top:hover svg {
    transform: translateY(-3px);
    filter: drop-shadow(0 0 10px #00ff41);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}