.custom-float-btn {
    width: 50px;
    height: 50px;
    background-color: #343a40;
    color: #28a745;
    text-decoration: none;
    font-size: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.custom-float-btn:hover {
    background-color: #23272b;
    color: #20c997;
}
.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: #28a745;
    animation: bounce 2s infinite;
    z-index: 100;
    text-decoration: none;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateX(-50%) translateY(0);}
    40% {transform: translateX(-50%) translateY(-10px);}
    60% {transform: translateX(-50%) translateY(-5px);}
}

.fade-in-section {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    will-change: opacity, transform;
}

.fade-in-section.visible {
    opacity: 1;
    transform: none;
}