.fade-in {
    opacity: 0;
    transform: translateY(30px); /* fallback padrão */
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.show {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-left.show {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-right.show {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.show {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-down {
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-down.show {
    opacity: 1;
    transform: translateY(0);
}

.fade-in,
.fade-in-left,
.fade-in-right,
.fade-in-up,
.fade-in-down {
    will-change: opacity, transform;
}