html {

    --dust:     hsl(51 7% 81%);
    --grey:     hsl(51 10% 86%);
    --alabaster:hsl(48 10% 90%);
    --platinum: hsl(0 0% 92%);
    --plaster:  hsl(220 10% 94%);

    --salmon:   hsl(12 100% 76%);
    --pink:     hsl(3 100% 66%);
    --mint:     hsl(160 37% 53%);
    --pine:     hsl(174 42% 31%);

    --night:    hsl(240 63% 16%);
    --sky:      hsl(220 80% 95%);
    --ice:      hsl(220 100% 80%);
    --burst:    hsl(240 100% 50%);

    --color-dark:           var(--night);
    --color-light:          var(--sky);
    --color-accent:         var(--burst);
    --color-accent-light:   var(--ice);

}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background-color: light-dark(var(--color-light), var(--color-dark));
    color: light-dark(var(--color-dark), var(--color-light));
    font-family: 'font-primary', monospace;
    font-weight: 400;
    line-height: 1.618;
    transition: color 0.2s;
}

body {
    font-size: 1.25rem;
}


.rtb-header {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    padding: 1rem;
}

.rtb-header > * {
    margin: 0;
    padding: 0;
}

.rtb-header nav > ul {
    display: flex;
    font-size: 83.333333%;
    gap: 1rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.rtb-logo {
    display: inline-block;
    font-style: italic;
    font-weight: 800;
    text-decoration: none;
}

main {
    border: 0.125rem solid var(--color-accent);
    border-left: 0; border-right: 0;
    padding: 6rem 1.5rem;
}

main > * {
    display: grid;
    gap: 1.5rem;
    max-width: 60rem;
    margin-inline: auto;
    width: 100%;
}

strong {
    font-weight: 700;
}
h1 {
    font-weight: 800;
    font-size: 200%;
    line-height: 1;
}
hr {
    background-color: var(--color-accent);
    border: 0;
    height: 0.25rem;
    display: block;
    margin-inline: 0;
}
.callout {
    background-color: white;
    border-left: 0.5rem solid var(--color-accent);
    color: black;
    padding: 1rem;
}
blockquote {
    border-left: 0.5rem solid var(--color-accent);
    font-style: italic;
    margin: 0 0 0 -1.5rem;
    padding: 1rem;
}
blockquote em {
    font-style: normal;
}
blockquote > * {
    margin: 0;
    padding: 0;
}
a {
    color: light-dark(var(--color-accent), var(--color-accent-light));
    text-decoration-color: light-dark(var(--color-accent-light), var(--color-accent));
    text-decoration-style: solid;
    text-decoration-thickness: 0.1em;
    text-underline-offset: 0.2em;
}
.btn {
    background-color: var(--color-accent);
    border: 0;
    border-bottom: 0.25em solid var(--color-accent-light);
    color: white;
    display: inline-block;
    line-height: 1;
    padding: 0.5em 0.8em;
    text-decoration: none;
}

.swatches {
    display: flex;
    flex-wrap: wrap;
    font-size: 80%;
    list-style: none;
    padding: 0;
    text-align: center;
    & > li {
        align-content: center;
        color: white;
        display: block;
        height: 4rem;
        overflow: hidden;
        width: 25%;
    }
}

.listing {
    display: grid;
    gap: 1.5rem;
    margin-top: 3rem;
}

.listing > article {
    border-left: 0.25rem solid var(--color-accent-light);
    display: grid;
    gap: 0.5rem;
    line-height: 1.309;
    padding-left: 1rem;
}

.listing > article > * {
    margin: 0;

}

.scheme-switcher {
    border: 1px solid var(--color-accent);
    display: flex;
    font-size: 80%;
    line-height: 1;
    padding: 0.25em;
    width: fit-content;
}

.scheme-switcher-btn {
    margin: 0;
    padding-block: 0.5em;
    padding-inline: 1em;
    border: none;
    background-color: transparent;
    cursor: pointer;
    color: light-dark(var(--color-accent), var(--color-accent-light));
    font: inherit;
    &[aria-pressed='true'] {
        background-color: var(--color-accent);
        color: white;
    }
}

.rtb-footer {
    display: flex;
    font-size: 80%;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem;
    justify-content: space-between;
}


@media only screen and (min-width: 28rem) {
    body {
        font-size: 1.5rem;
    }
    h1 {
        font-size: 300%;
    }
}