@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400..900&display=swap');


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI','Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html{
    font-size: 62.5%;
}

:root{
    --grid-cell:6;
    --white: #fff;
    --light-gray: #55;
    --gray: #222;
    --blue:#119ec9;
    --gap: 1rem;
    --time: 0.5s;
}

.container{
    height: 100svh;
    display: grid;
    place-items:center;
}

.playground{
   background-color: #f7eedd; 
   width: 90vmin;
   height: 90vmin;
   border-radius: var(--gap);
   display: grid;
   gap:var(--gap);
   padding: var(--gap);
}

.card {
    background-color: var(--white);
    box-shadow: 0 0 .3rem #eee;
    display: grid;
    place-items: center;
    border-radius: inherit;
    cursor: pointer;
    perspective: 100rem;
    transform: rotateY(180deg);
    transition: transform var(--time) var(--time) linear;
}

.card.change {
   pointer-events: none;
   transform: rotateY(0);
   transition: transform var(--time) linear;

}


.card.pause {
    pointer-events: none;
}

.card.stop {
    pointer-events: none;
}

.card img {
    transform-style: preserve-3d;
    transform: rotateY(180deg);
    width: 100%;
    height: 100%;
    object-fit: scale-down;
    background-color: var(--white);
    border-radius: inherit;
    transition: transform var(--time) var(--time) linear;
    backface-visibility: hidden;
}

.card.change img {
    transform: rotateY(0); 
    transition: transform var(--time) linear;
}

.modal{
    position: fixed;
    inset: 0;
    background-color: rgba(119, 118, 115, 0.604);
    display: grid;
    place-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacitiy var(--time) 1s;
}

.modal-content{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    row-gap: var(--gap);
    width: 40rem;
    aspect-ratio: 1;
    background-color: rgba(225, 225, 225, 0.836);
    border-radius: var(--gap);
}

.modal-heading{
    font-size: 4rem;
    color: var(--light-gray);
    margin-bottom: var(--gap);

}

.modal-time{
    display: flex;
    align-items: center;
    column-gap: var(--gap);
}

.modal-time > span{
    font-size: 1.8rem;
    color: var(--gray);

}

.modal-text {
    font-size: 1.8rem;
    font-weight: 500;
    text-transform: uppercase;
    color: var(--light-gray);
}

.wrong {
    display: inline-block;
    margin: 0.5rem;
    font-size: 2.5rem;
}

.btn{
    box-sizing: content-box;
    padding: 0.5rem 1rem;
    background-color: var(--blue);
    border: none;
    border-radius: 1rem;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: var(--white);
    margin-top: 2rem;
    cursor: pointer;

}

.yes-btn , .cancel-btn {
   margin-inline: 0.5rem ;
   width: 7rem;
}


.features{
    display: flex;
    align-items: center;
    column-gap: 3rem;
}

.features .restart-btn {
    margin: 0;
    font-size: 1rem;
}

.timer{
    font-family:"Orbitron", sans-serif ;
    font-size: 1.3rem;
    color: var(--blue);
}

.timer span{
    font-family:"Orbitron", sans-serif ;
    font-size: 1.6rem;
    width: 2.6rem;

}
 
.timer span:last-child{
    margin-left: 0.5rem;
}

@media (max-width : 600px) {
:root { 
    --gap : 0.5rem;
}
.playground{
    width: 95vmin;
    height: 95vmin;
}

.modal-content{
    width: 30rem;
    text-align: center;
}
}