.glass-tube {
    --green: #6CB328;
    --green-light: #AFE356;
    --green-dark: #38741A;

    --_margin-left: 3rem;

    width: calc( 95vw - var(--_margin-left) );
    min-height: 10rem;

    background-color: var(--green-light);
    box-shadow:
        -0.5rem -1rem inset var(--green),
        0rem 0.2rem inset var(--green-dark);

    padding-inline: 2rem;
    padding-block: 0.5rem;
    margin-left: var(--_margin-left);
    border-top-right-radius: 100vw;
    border-bottom-right-radius: 100vw;

    color: black;

    position: relative;

    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
}

.glass-tube::before {
    content: '';
    position: absolute;

    width: var(--_margin-left);

    background-image: url('/assets/images/tube-holder.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position-x: right;

    top: 0;
    left: calc( var(--_margin-left) * -1 );
    bottom: 0;
}

.glass-tube h2 { font-size: xx-large; }

.glass-tube a { color: var(--green-dark); }
.glass-tube a:is( :hover, :focus ) { color: var(--green); }

.tube-holder {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    width: 100%;

    margin-bottom: 4rem;
}

/* Find Familiar's book stacks */

.book-pile {
    display: flex;
    flex-direction: column;
    gap: 1rem;

    margin-top: 15rem;

    isolation: isolate;
    align-items: center;

    container-type: inline-size;
}

.book-pile > *:nth-child(1) { --child-number: 1 }
.book-pile > *:nth-child(2) { --child-number: 2 }
.book-pile > *:nth-child(3) { --child-number: 3 }
.book-pile > *:nth-child(4) { --child-number: 4 }
.book-pile > *:nth-child(5) { --child-number: 5 }
.book-pile > *:nth-child(6) { --child-number: 6 }
.book-pile > *:nth-child(7) { --child-number: 7 }
.book-pile > *:nth-child(8) { --child-number: 8 }
.book-pile > *:nth-child(9) { --child-number: 9 }

.book {
    --cover-main: hsl(10, 50%, 37%);
    --cover-dark: hsl(10, 50%, 26%);
    --line-color: hsl(10, 50%, 15%);
    --page-color: hsl(40, 100%, 75%);
    --page-color-dark: hsl(40, 35%, 45%);
    --swew-angle: 26.6666deg;
    position: relative;
    z-index: calc( -1 * var(--child-number) );

    width: 30rem;
    height: 7.5rem;
    padding: 1rem;
    border: 0.5rem solid var(--line-color);

    background-color: var(--cover-main);

    transform:
        skew( 0deg, var(--swew-angle) )
        scaleX(0.5)
        translateX(-50%);
}

.book::before {
    content: '';
    position: absolute;

    top: calc( -200% - 0.5rem );
    left: calc( 50% - 2rem );
    width: calc( 100% + 1rem );
    height: 200%;

    background-color: var(--cover-dark);
    border-block: 0.5rem solid var(--line-color);
    border-inline: 1rem solid var(--line-color);

    transform:
        skewX( calc( 90deg + var(--swew-angle) ) );
}

.book::after {
    content: '';
    position: absolute;

    top: calc( -100% - 0.55rem );
    right: calc( -100% + 2.5rem );

    width: 90%;
    height: calc( 100% + 1rem );
    background-image: linear-gradient( to bottom,
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark),
        var(--page-color), var(--page-color-dark)
    );

    border-block: 0.5rem solid var(--line-color);
    border-inline-start: 1rem solid var(--line-color);
    border-inline-end: 1rem solid transparent;

    transform:
        skewY( calc( -1 * var(--swew-angle) ) );
}

.book a {
    color: var(--text);
	font-weight: 400;
    font-size: small;
}

.book h2 {
    font-size: x-large;
    text-align: center;
}

@container (max-width: 400px) {
    .book {
        width: 20rem;
        height: 5rem;
    }

    .book h2 {
        font-size: larger;
    }

    .book a {
        font-size: x-small;
    }
}