footer {
    background-color: transparent;
    color: #aaa;
    font-size: 0.9rem;
    text-align: center;
    padding: 20px 10px;
    border-top: 1px solid #333;
    margin-top: auto;
}
#thinking .dot {
    animation: blink 1.4s infinite;
    opacity: 0.2;
}

#thinking .dot.one {
    animation-delay: 0s;
}
#thinking .dot.two {
    animation-delay: 0.2s;
}
#thinking .dot.three {
    animation-delay: 0.4s;
}

@keyframes blink {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
}