html,
body {
    height: 100%;
    width: 100%;
    background-color: #181818;
}

/* Intro */

.intro {
    position: fixed;
    inset: 0;
    z-index: 10;
    width: 100%;
    height: 100%;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;

    font-family: Noto Sans;
    overflow: hidden;
    transition: transform 2s ease-out;
    background-color: #181818;
}

.intro.hidden {
    display: none;
}

.intro.leave {
    transform: translateY(-120%);
}

.author {
    position: absolute;
    top: 30px;
    left: 49%;
    transform: translateX(-50%);
    font-weight: 100;
    font-size: 17px;
    letter-spacing: 2px;
    
    cursor: pointer;
}

.intro #greetings {
    letter-spacing: 1px;
    font-weight: 100;
    font-size: 80px;
    font-style: normal;
    
}

/* Background Clouds Intro */

.first-cloud-intro {
    position: absolute;
    top: 500px;
    left: -10px;
    width: 220px;
    height: 120px;
    rotate: -10deg;

    background:
        radial-gradient(60px 60px at 20px 65px, #414141 98%, transparent 100%),
        radial-gradient(50px 50px at 120px 35px, #414141 98%, transparent 100%),
        radial-gradient(70px 70px at 135px 150px, #414141 98%, transparent 100%),
        linear-gradient(#414141, #414141) 0 70% / 220px 60px no-repeat;

    filter: blur(40px);
}

.second-cloud-intro {
    position: absolute;
    top: 50px;
    right: 42%;
    width: 210px;
    height: 110px;
    rotate: 10deg;

    background:
        radial-gradient(58px 58px at 35px 55px, #414141 98%, transparent 100%),
        radial-gradient(48px 48px at 95px 30px, #414141 98%, transparent 100%),
        radial-gradient(65px 65px at 155px 58px, #414141 98%, transparent 100%),
        radial-gradient(36px 36px at 120px 85px, #414141 98%, transparent 100%),
        linear-gradient(#414141, #414141) 0 65% / 210px 56px no-repeat;

    filter: blur(40px);
}

.thrid-cloud-intro {
    position: absolute;
    top: 65%;
    right: -3%;
    width: 250px;
    height: 190px;
    rotate: 180deg;

    background:
        radial-gradient(58px 58px at 35px 55px, #414141 98%, transparent 100%),
        radial-gradient(48px 48px at 95px 30px, #414141 98%, transparent 100%),
        radial-gradient(65px 65px at 155px 58px, #414141 98%, transparent 100%),
        radial-gradient(36px 36px at 120px 85px, #414141 98%, transparent 100%),
        linear-gradient(#414141, #414141) 0 65% / 210px 56px no-repeat;

    filter: blur(40px);
}

.first-cloud-intro,
.second-cloud-intro,
.thrid-cloud-intro {
    opacity: 0;
    transition: opacity 2s ease-in-out;
    will-change: opacity, top, left;
}


/* Main page */

.container {
    position: relative;
    z-index: 1;
    height: 100vh;
    width: auto;
    background-color: #181818;
    color: #fff;
    font-size: 50px;

    display: flex;
    justify-content: center;
    align-items: center;
}