.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    font-size: 24px;
    padding: 15px 20px;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.2s ease, color 0.2s ease;
    z-index: 100;
}

.nav-arrow:hover {
    background: #ffffff;
    color: #000000;
}

.prev-overlay {
    left: 20px;
}

.next-overlay {
    right: 20px;
}

@media (max-width: 768px) {
    .nav-arrow {
        font-size: 18px;
        padding: 10px 14px;
        background: rgba(0, 0, 0, 0.3);
    }
    .prev-overlay {
        left: 10px;
    }
    .next-overlay {
        right: 10px;
    }
}