body {
    color: #bbb;
    background-color: #222;
    font-family: Inter, system-ui, sans-serif;
    font-variation-settings: "wdth" 90; /* not working */
}

main {
    max-width: 1900px;
    margin: 1em auto;
}
main > * {
    margin-inline: 1rem;
}
.alphabet {
    display: flex;
    justify-content: center;
    gap: 0.25em;
}
.btn {
    all: unset;
    cursor: pointer;
}
.btn.letter {
    padding: 0.25em 0.5em;
    font-size: 1.3em;
    text-transform: uppercase;
    color: #ccc;
    background-color: #333;
    border-radius: 0.25em;
}

.btn.letter:hover {
    color: #0b0;

}

.o2 {
    opacity: 0.2;
}

code {
    font-family: 'DM Mono', monospace;
}

.periodic-table {
    margin: 1em 1em;
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    grid-template-rows: repeat(7, 1fr) 0.25fr repeat(2, 1fr);
    gap: 0.5em;
    color: #fff;
}

.element-block {
    border-radius: 0.25em;
    padding: 0.5em;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;

    & h2 {
        text-align: center;
        font-size: 1.6vw;
        letter-spacing: -0.05em;
        line-height: 1.2;
        margin: 0;
    }
    & p {
        text-align: center;
        margin: 0;
        font-size: min(0.55vw, 13px);
    }
    &.barium + .element-block::before {
        content: 'lanthanides';
        font-size: min(0.55vw, 13px);
        text-align: center;
        display: block;
        margin-top: 3em;
    }
    &.radium + .element-block::before {
        content: 'actinides';
        font-size: min(0.55vw, 13px);
        text-align: center;
        display: block;
        margin-top: 3em;
    }

    &.radioactive {
        background-image: url(/images/radioactive-svgrepo.svg);
        background-repeat: no-repeat;
        background-size: 35%;
        background-position: 2px 2px;
    }
}

.element-block:hover,
.element-block:active {
        outline: solid 4px #fff;
    }
.atomic-number {
    text-align: right;
    font-size: min(0.55vw, 13px);
    line-height: 0.5;
}


.he {
    grid-column: -2 / -1;
}

.b,
.al {
    grid-column: 13/14;
}

/* 
.gc { 
    grid-column: 10 / 11;
} */
.lr {
    grid-column: -2 / -1;
    grid-row: 10 / 11;
}

/* ====== GROUPS ====== */

.nonmetal {
    background-color: rgb(173, 2, 2);
}
.alkali-metal {
    background-color: #016301;
}
.noble-gas {
    background-color: #562cca;
}
.alkaline-earth-metal {
    background-color: #94a426;
}
.metalloid {
    background-color: rgb(212, 141, 4);
}
.transition-metal {
    background-color: rgb(1, 129, 184);
}
.halogen {
    background-color: orangered;
}
.metal {
    background-color: rgb(93, 50, 24);
}
.actinoid {
    background-color: cadetblue;
}
.element-block.actinoid {
    grid-row: 10 / 11;
}
.lanthanoid {
    background-color: rgb(33, 61, 201);
}
.element-block.lanthanoid {
    grid-row: 9 / 10;
}
.post-transition-metal {
    background-color: #ed35ed;
}

.actinides,
.lanthanides {
    grid-column: span 3;
    background-color: transparent;
    display: flex;
    justify-content: end;
    align-items: center;
    /* height: 100%; */

    & h2 {
        text-align: right;
        margin: 0;
        font-size: 1.5rem;
    }
}

.colour-keys {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.5em;
    margin: 3em 1em;
}

.key {
    display: grid;
    place-content: center;
    border-radius: 5px;
    padding: 0.5em 1em;
    font-size: clamp(0.625rem, 0.1237rem + 0.7833vw, 1rem);
    font-weight: bold;
    color: #fff;
}

dialog {
    /* position: fixed; */
    /* inset: 20%; */
    /* width: 700px; */
    margin: auto;
    min-width: 70ch;
    border: none;
    outline: none;
    color: #fff;
    border-radius: 6px;
    padding: 1em 2em 2em 2em;
    
    & a {
        color: #fff;
    }
}

dialog::backdrop {
    backdrop-filter: blur(7px);
    background-color: #0008;
}
.content {
    display: grid;
    grid-template-columns: 70ch auto;
    gap: 2em;
}

.close-modal {
    float: right;
    border: none;
    outline: none;
    padding: 0.25em 0.5em;
    color: #fff;
    background-color: darkred;
    font-size: 1.25em;
    border-radius: 4px;
    transition: all 0.25s ease-out;

    &:hover {
        rotate: 180deg;
    }
}

@media (max-width: 1250px) {
    .atomic-number,
    .elem-name {
        display: none;
    }
    .element-block {
        /* aspect-ratio: 1 / 1; */
        display: grid;
        place-content: center;
    }
}

footer {
    & ul {
        list-style-type: none;
        padding: 0;
        margin: 2em 0;
        display: flex;
        gap: 2em;
        justify-content: center;
    }

    & a {
        color: #a2e20c;
        text-decoration: none;
    }
}