@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}
.pulse {
    animation: pulse 2s infinite;
}
.ar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
}
.ai-message {
    max-width: 80%;
    margin-bottom: 10px;
    padding: 12px;
    border-radius: 18px;
    position: relative;
}
.user-message {
    background-color: #3b82f6;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}
.assistant-message {
    background-color: #f3f4f6;
    color: #111827;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}
#arViewport {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}