*, 
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

:root{
    --white: #fff;
    --black: #000;
    --border-clr: rgba(255, 255, 255, 0.25);
    --bg-clr: rgba(255, 255, 255, 0.15);
}

html{
    font-size: 62.5%;
}

body{
    font-size: 1.6rem;
}

/* wrapper */
.wrapper{
    width: 100vw;
    min-height: 100vh;
    color: var(--white);
    background:linear-gradient(90deg, rgba(0, 255, 235, 1) 0%, rgba(7, 58, 187, 1) 100%);
    display: grid;
    place-items: center;
    align-items: start;
}

.app-name{
    font-size: 4.5rem;
    align-self: center;
    padding-bottom: 3rem;
}

/* game info */
.game-info{
    border: 1px solid var(--border-clr) ;
    padding: 0.8rem 4.8rem;
    border-radius: 1.6rem;
    background-color: var(--bg-clr);
    backdrop-filter: blur(7px);
}

/* game */
.game{
    width: 90%;
    max-width: 32rem;
    aspect-ratio: 1/1;
    background-color: var(--bg-clr);
    border: 1px solid var(--border-clr);
    border-radius: 1.6rem;
    backdrop-filter: blur(7px);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    padding: 3.2rem;
}

.box{
    width: 100%;
    aspect-ratio: 1 / 1;
    display: grid;
    place-items: center;
    font-size: 4.8rem;
    cursor: pointer;
    /* position: relative; */
    transition: all 150ms ease-in-out 0s;
}

.box-1, .box-2, .box-4, .box-5{
    border-bottom: 2px solid var(--white);
    border-right: 2px solid var(--white);
}

.box-3, .box-6{
    border-bottom: 2px solid var(--white);
}

.box-7, .box-8{
    border-right: 2px solid var(--white);
}

/* new game button */
.new-game-btn{
    color: var(--white);
    background-color: var(--bg-clr);
    border: none;
    border: 1px solid var(--border-clr);
    border-radius: 1.6rem;
    padding: 0.8rem 3.2rem;   
    backdrop-filter: blur(7px);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    /* border-image: initial; */
    text-transform: capitalize;
    transition: all 150ms ease-in-out;
}

.new-game-btn.active{
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.win {
    background-color: rgba(0, 255, 0, 0.3);
}

@media (max-width: 350px){
    .box{
        font-size: 4rem;
    }

    .app-name{
        font-size: 3.5rem;
    }
}