* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 62.5%;
}

body {
    font-size: 2rem;
    font-family: sans-serif;
}

.neon {
    height: 80rem;
    background: #252A34;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 2rem;
    position: relative;
    width: 100%;
    overflow: hidden;
}

.circle {
    height: 40rem;
    width: 40rem;
    border-radius: 50%;
    position: absolute;
    box-shadow: inset 0 0 3rem 0 rgba(0, 0, 0, 0.6);
    animation: colorRotation 30s alternate infinite;
}

.circle--first {
    top: -10%;
    left: -10%;
    background: linear-gradient(#2FA4FF, #00FFDD);
}

.circle--second {
    right: -10%;
    top: -10%;
    background: linear-gradient(#49FF00, #77D970);
}

.circle--third {
    left: -10%;
    top: 50%;
    background: linear-gradient(#49FF00, #77D970);
}

.circle--fourth {
    right: -10%;
    top: 55%;
    background: linear-gradient(#2FA4FF, #00FFDD);
}

.neon h1 {
    color: white;
    font-size: 300%;
    animation-name: popup;
    animation-duration: 0.8s;
    animation-fill-mode: backwards;
    animation-delay: 1.4s;
    z-index: 1;
}

.cards {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.card {
    position: relative;
    width: 20rem;
    height: 20rem;
    background: rgba(34, 40, 49, 0.8);
    list-style: none;
    border: 0.1rem solid rgba(255, 255, 255, 0.6);
    animation-name: popup;
    animation-duration: 0.8s;
    animation-fill-mode: backwards;
    transition: 0.2s transform;
}

.card::after {
    content: "";
    background: linear-gradient(#2FA4FF, #00FFDD);
    width: 100%;
    height: 2rem;
    position: absolute;
    bottom: 0;
    left: 0;
    animation: colorRotation 30s alternate infinite;
}

.card:hover{
    transform: scale(1.1);
}

.card:nth-of-type(2)::after,
.card:nth-of-type(4)::after,
.card:nth-of-type(6)::after {
    background: linear-gradient(#49FF00, #77D970);
}

.card:nth-of-type(1) {
    animation-delay: 0s;
}

.card:nth-of-type(2) {
    animation-delay: 0.2s;
}

.card:nth-of-type(3) {
    animation-delay: 0.3s;
}

.card:nth-of-type(4) {
    animation-delay: 0.4s;
}

.card:nth-of-type(5) {
    animation-delay: 0.5s;
}

.card:nth-of-type(6) {
    animation-delay: 0.6s;
}

@keyframes colorRotation {
    from {
        filter: hue-rotate(0);
    }
    to {
        filter: hue-rotate(1turn);
    }
}

@keyframes popup {
    from {
        opacity: 0;
        transform: translateY(2rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media screen and (max-width:37.5rem){
    .neon{
        padding: 4rem;
        height: auto;
    }
    .circle--second{
display: none;

    }
}