*,*::before,*::after{
    box-sizing: border-box;
}

body{
    margin: 0;
    padding: 0;
    font-family: 'Red Hat Text', sans-serif;
    text-align: center;
    background: linear-gradient(hsl(235, 16%, 14%), rgb(38, 29, 46));
    font-size: 14px;
}

.container{
    min-height: 80vh;
    position: relative;
    background-image: url(images/pattern-hills.svg), url(images/bg-stars.svg);
    background-repeat: no-repeat, no-repeat;
    background-size: 850px,950px;
    background-position: 90% 100%, 50% 30%;
    /* border: 2px solid red; */
}

.heading{
    color: white;
    font-size: 18px;
    text-transform: uppercase;
    /* border: 2px solid black; */
    width: 90%;
    margin: auto;
    margin-top: 7em;
    letter-spacing: .3em;
}

.countdown-container{
    /* border: 2px solid white; */
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 15px;
    width: 90%;
    margin: auto;
    padding: 2em 0;
    
}

.card{
    height: 60px;
    background: hsl(236, 21%, 26%);
    /* border: 2px solid red; */
    text-align: center;
    font-size: 32px;
    color: hsl(345, 95%, 68%);
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border-radius: 5px;
    box-shadow: 0 8px 1px -4px hsl(234, 17%, 12%);
    transform-style: preserve-3d;
    perspective: 600px;
    transition: transform .7s;
    
}

.display{
    /* border: 2px solid red; */
    z-index: 1;
}

.front-display{
    /* border: 2px solid blue; */
    position: absolute;
    height:30px;
    top: 0px;
    width: 100%;
    background: hsl(233, 21%, 23%);
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    backface-visibility:hidden;
   transition: transform 2s;
    animation: front-display 3s 1s infinite ease-in-out;
}

/* .front-display:hover{
    transform: rotateX(-180deg);
    height: 60px;
} */


  /* @keyframes front-display {
    0% { transform: rotateX(0deg); }
    100% { transform: rotateX(-180deg); height:60px; }
    
  } */


.back-display{
    /* border: 2px solid green; */
    position: absolute;
    height:30px;
    top: 30px;
    width: 100%;
    
}

.display-heading{
    font-size: 7px;
    text-transform: uppercase;
    color: hsl(237, 18%, 59%);
    letter-spacing: .2em;
    margin-top: 10px;
}

.social-icons{
    /* border: 2px solid red; */
    position:absolute;
    display: flex;
    justify-content: center;
    bottom: 20px;
    margin-left: 35%;
}

.icon-flex:nth-child(2), .icon-flex:nth-child(3){
    margin-left: 2em;
}


.fab{
    color: hsl(237, 18%, 59%);
    font-size: 20px;
}

.fab:hover{
    color: hsl(345, 95%, 68%);
    cursor: pointer;
}

.attribution
 { 
     display: none;
    font-size: 11px; 
    text-align: center; 
    position: absolute;
    bottom: 0;
    left: 10%;
    
    /* border: 2px solid red; */
}

   

.attribution a 
{ 
    color: hsl(345, 95%, 68%);
}


/* ----- For desktop ------- */

@media (min-width:700px){

    .container{
        min-height: 78vh;
        background-image: url(images/pattern-hills.svg), url(images/bg-stars.svg);
        background-size: contain, 950px;
    }

    .heading{
        margin-top: 10em;
        font-size: 13px;
    }

    .countdown-container{
        width: 40%;
        margin-top: 2em;
    }

    .card{
        font-size: 50px;
        height: 80px;
    }

    .display-heading{
        font-size: 9px;
        margin-top: 15px;
    }

    .front-display{
        height: 40px;
    }

    .social-icons{
        margin-left: 45%;
        bottom: 50px;
    }

    .attribution{
        display: block;
        margin-left: 30%;
    }

    
}