:root {
    --dark-color: 20, 30, 31;
}

html {
    height: auto;
    min-height: 100%;
}

html,
body {
    background: rgb(var(--dark-color));
    color: white;
    font-family: 'Dosis', sans-serif;
    font-weight: 500;
    margin: 0;
    width: 100%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

::selection {
    background-color: rgb(40, 60, 62);
}

header {
    align-items: center;
    background: linear-gradient(
        rgba(var(--dark-color), 0) 0%,
        rgba(var(--dark-color), 0.06) 10%,
        rgba(var(--dark-color), 0.15) 20%,
        rgba(var(--dark-color), 0.24) 30%,
        rgba(var(--dark-color), 0.33) 40%,
        rgba(var(--dark-color), 0.44) 50%,
        rgba(var(--dark-color), 0.54) 60%,
        rgba(var(--dark-color), 0.65) 70%,
        rgba(var(--dark-color), 0.77) 80%,
        rgba(var(--dark-color), 0.88) 90%,
        rgba(var(--dark-color), 1) 100%
    ), linear-gradient(43deg,
        hsl(4deg 88% 58%) 0%,
        hsl(22deg 80% 51%) 10%,
        hsl(35deg 86% 45%) 20%,
        hsl(46deg 74% 44%) 30%,
        hsl(60deg 51% 46%) 40%,
        hsl(81deg 45% 56%) 50%,
        hsl(111deg 45% 66%) 60%,
        hsl(145deg 57% 68%) 70%,
        hsl(163deg 69% 70%) 80%,
        hsl(175deg 77% 73%) 90%,
        hsl(185deg 100% 81%) 100%
    );
    display: flex;
    flex-direction: column;
    gap: 2em;
    height: 100vh;
    justify-content: center;
    width: 100%;
}

header ::selection,
footer ::selection {
    background-color: rgb(var(--dark-color));
}

header .elements {
    color: black;
    display: flex;
    flex-direction: row;
    font-size: min(2vw, 2.5vh, 21.6px);
    gap: 1em;
}

header .element {
    align-items: center;
    background: #666;
    border: 3px solid #888;
    box-sizing: border-box;
    cursor: default;
    display: flex;
    flex-direction: column;
    height: 12em;
    justify-content: center;
    mix-blend-mode: color-dodge;
    position: relative;
    user-select: none;
    width: 12em;
}

header .element .center {
    margin-bottom: .7em;
    text-align: center;
}

header .element p {
    margin: 0;
}

header .element p.symbol {
    font-size: 7em;
    margin-bottom: -.2em;
}

header .element p.name {
    font-size: 1.2em;
}

header .element p.number {
    font-size: 1.5em;
    left: 0.2em;
    position: absolute;
    top: 0;
}

header .element p.mass {
    bottom: 0;
    left: 0.2em;
    position: absolute;
}

header .element p.radioactive {
    bottom: -0.15em;
    font-size: 2em;
    right: 0.05em;
    position: absolute;
}

header .element p.hover {
    opacity: 0;
    transition: opacity 0.5s ease;
}

header .element:hover p.hover {
    opacity: 1;
}

header .bio {
    max-width: min(90%, calc(30% + 216px), 540px);
}

header .bio p {
    margin: 0;
}

header .bio h1 {
    font-size: 1.5em;
    font-weight: 400;
    margin: 0 0 .1em;
}

header .bio .external {
    align-items: center;
    color: #888;
    cursor: default;
    display: flex;
    flex-wrap: wrap;
    gap: .5em 1em;
    justify-content: flex-end;
    margin-top: .5em;
    mix-blend-mode: color-dodge;
    text-align: right;
    user-select: none;
}

header .bio .external span {
    font-weight: 400;
}

header .bio .external .icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: .5em 1em;
}

header .bio .external .icons svg {
    height: 1.2em;
    line-height: 1;
    fill: #888;
    vertical-align: bottom;
}

header .bio .external a svg {
    cursor: pointer;
    text-decoration: none;
    transition: fill .5s ease;
}

header .bio .external a:hover svg {
    fill: #ccc;
}