#flashcards{
    width: 80vw;
    height: 50vh;
    overflow: hidden;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    font-family: "Kollektif Regular", sans-serif;
    align-self: center;
    margin: 10px 40px;
    border-color: var(--primary-color);
    border-style: solid;
    border-width: 4px;
    border-radius: 15px;
    box-shadow: black 4px 2px;
}

#swiper{
    margin-top: 20px;
    width: 30vw;
    height: 40vh;
    aspect-ratio: 2/ 3;
    perspective: 300px;
    perspective-origin: center 50%;
    transform-style: preserve-3d;
    position: relative;

}

.card{
    width: 100%;
    height: 100%;
    position: absolute;
    border-radius: 20px;
    overflow: hidden;
    transform: translateZ(calc(-30px * var(--i))) translateY(calc(-20px * var(--i))) rotate(calc(-4deg * var(--i)));
    filter: drop-shadow(2px 2px 20px rgba(0,0,0,0.5));
    cursor: pointer;
    background-color: var(--flashbg);
}

.cardFace{
    position: absolute;
    width: 100%;
    height: 100%;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-size: 1em;
}

.card.is-flipped {
    transform: rotateX(180deg);
}
.front{
    transform: rotateX(0deg);
}
.back{
    backface-visibility: hidden;
    transform: rotateX(180deg);
}

.card div{
    font-size: 3vh;
    color: midnightblue;
    margin-right: 10px;
}


#wrong, #right{
    font-size: 4vh;
    border-radius: 50%;
    text-align: center;
    position: relative;
    z-index: 1;
    animation-name: iconAnimation1;
    animation-duration: 1s;
    animation-timing-function: ease-in-out;
    animation-fill-mode: both;
    /*dont run animation at the beginning*/
    animation-play-state: paused;
}

#right{
    color: var(--primary-color);
}
#wrong{
    color: var(--primary-color);
}

#right.trigger, #wrong.trigger{
    animation-name: iconAnimation2;
}

@keyframes iconAnimation1 {
    0%,
    100%{
        opacity: 0.2;
    }
    50%{
        opacity: 1;
        text-shadow: 0 0 20px white;
    }
}
@keyframes iconAnimation2 {
    0%,
    100%{
        opacity: 0.2;
    }
    50%{
        opacity: 1;
        text-shadow: 0 0 20px white;
    }
}