* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;
}

:root {
    --wall-clr : rgb(12, 53, 71);
    --visited-clr : rgba(0, 190, 218, 0.75);
    --path-clr : rgb(255, 254, 106);
    --text-light: #515067;
}


.caret{
    width: 14px;
    display: block;
    aspect-ratio: 1;
    background-image: url(../assets/icon/caret-down.svg);
}
.wall{
    background-color: var(--wall-clr);
    animation: wallAnimation .5s ease-out forwards;
}
.path{
    animation: pathAnimation 1.5s ease-out forwards;
}
.visited{
    animation: visitedAnimation 1.5s ease-out forwards;
}
.unvisited{
    background-color: #fff;
    border: 1px solid var(--light-line);
}
.source{
    background: url(../assets/icon/source.svg);
}
.target{
    background: url(../assets/icon/target.svg);
}
.icon{
    aspect-ratio: 1;
    width: 20px;
}

/* =================== animations =================== */

@keyframes wallAnimation {
    0% {
        transform: scale(.3);
        background-color: var(--wall-clr);
    }
    
    50% {
        transform: scale(1.0);
        background-color: var(--wall-clr);
    }
    100% {
        transform: scale(1.0);
        background-color: var(--wall-clr);
    }
}

@keyframes visitedAnimation {
    0% {
        transform: scale(.3);
        background-color: rgba(0, 0, 66, 0.75);
        border-radius: 100%;
    }

    50% {
        background-color: rgba(17, 104, 217, 0.75);
    }

    75% {
        transform: scale(1);
        background-color: rgba(0, 217, 159, 0.75);
    }

    100% {
        transform: scale(1);
        background-color: var(--visited-clr);

    }
}


@keyframes pathAnimation {
    0% {
        transform: scale(.6);
        background-color: var(--path-clr);
    }
    
    50% {
        transform: scale(1);
        background-color: var(--path-clr);
    }
    
    100% {
        transform: scale(1.0);
        background-color: var(--path-clr);
    }
}