.retro {
    filter: contrast(1.2) brightness(0.9);
    animation: crt-flicker 0.1s infinite;
}
@keyframes crt-flicker {
    0% { opacity: 0.98; }
    50% { opacity: 1; }
    100% { opacity: 0.98; }
}
.disco {
    animation: disco-bg 1s infinite;
}
@keyframes disco-bg {
    0% { background-color: red; }
    25% { background-color: yellow; }
    50% { background-color: blue; }
    75% { background-color: green; }
    100% { background-color: red; }
}
.mouth {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 15px;
    border: 2px solid black;
    border-top: none;
    border-radius: 0 0 50% 50%;
}
.mouth-happy {
    border-radius: 0 0 50% 50%;
}
.mouth-sad {
    border-radius: 50% 50% 0 0;
    border-bottom: none;
    border-top: 2px solid black;
    top: 35px;
    bottom: auto;
}
.mouth-angry {
    height: 5px;
    background: black;
    border: none;
}
.mouth-scared {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: none;
    border: 2px solid black;
}
@media (prefers-reduced-motion: reduce) {
    .pulse, .disco, .retro {
        animation: none !important;
    }
}