/* 动态显示动画 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.slide-down {
    animation: slideDown 0.3s ease-out;
}

.bounce-in {
    animation: bounceIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* 显示/隐藏类 */
.show {
    display: block !important;
}

.hide {
    display: none !important;
}

.visible {
    visibility: visible !important;
    opacity: 1 !important;
}

.invisible {
    visibility: hidden !important;
    opacity: 0 !important;
}