.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}

.loading::after {
    content: "...";
    animation: dots 1s steps(5, end) infinite;
}

@keyframes dots {
    0%, 20% { content: "."; }
    40% { content: ".."; }
    60%, 100% { content: "..."; }
}

.hidden {
    display: none;
}