.a3-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100vh;
    background: url(../images/a3-bg.jpg);
    z-index: -1;
}

.article3 {
    position: relative;
    height: 100vh;
    background: transparent;
    overflow: hidden;
    animation: glow 1s infinite;
}

@keyframes glow {
    50% {
        filter: brightness(120%);
    }
}

.article3::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .8);
    z-index: 2;
}

.a3-background {
    position: absolute;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(14, 1fr);
    z-index: 1;
}

.a3-text {
    text-align: center;
    z-index: 3;
}

.a3-text h5 {
    color: #fff;
    font-size: 240px;
    white-space: nowrap;
}

.a3-text p {
    color: #fff;
    font-size: 85px;
    line-height: 1.3;
    text-align: center;
}

@property --k {
    syntax: "<number>";
    initial-value: 0;
    inherits: false;
}

svg[height="0"] {
    position: absolute;
}

.gr-text {
    --k: 0;
    place-self: center;
    background: linear-gradient(90deg, hsl(calc(var(--k)*1turn), 95%, 65%), hsl(calc(var(--k)*1turn + 90deg), 95%, 65%));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    filter: url(#f);
    text-align: center;
    text-transform: uppercase;
    animation: k 4s linear infinite;
}

@keyframes k {
    to {
        --k: 1;
    }
}


/*==================================================*/
@media (max-width: 768px) {
    .a3-bg {
        background: url(../images/a3-bg-m.jpg);
    }
}


@media (max-width: 650px) {
    .a3-text h5 {
        font-size: 150px;
    }
    
    .a3-text p {
        font-size: 65px;
    }
}


@media (max-width: 550px) {
    .a3-text p {
        font-size: 55px;
    }
}


@media (max-width: 450px) {
    .a3-text h5 {
        font-size: 100px;
    }
    
    .a3-text p {
        font-size: 45px;
    }
}