/* default variables */
:root {
    --responsive-mode: "default";
    --container-width: 1024px;
    --container-gutter: calc(calc(100% - var(--container-width)) / 2);
    --gutter-default: 15px;
    --whitespace: 50px;
    --system-ui-fonts: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --gutter-sm: calc(var(--gutter-default) / 2);
    --gutter-1x: calc(var(--gutter-default) * 1);
    --gutter-2x: calc(var(--gutter-default) * 2);
    --gutter-3x: calc(var(--gutter-default) * 3);
}

/* base styles */
body {
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: var(--system-ui-fonts);
    font-size: 18px;
}

header,
section,
footer {
    padding: var(--whitespace, 30px) 0;
}

/* typography */
p:not(:last-child) { margin-bottom: 0.75em; }
a { color: inherit; }
a:visited { color: inherit; } /* don't change the color of visited links */
pre:has(code) { overflow-x: scroll; }
pre:has(code) { margin-bottom: var(--gutter-1x, 15px); }
svg { color: inherit; }

/* simple grid system */
content-container {
    display: block;
    width: var(--container-width);
    margin-left: var(--container-gutter);
    margin-right: var(--container-gutter);
    padding: 0;
}
content-whitespace {
    display: flex;
    flex-direction: column;
    flex: 1;
}
content-row {
    width: 100%;
    max-width: 100%;
    gap: var(--gutter-1x, 15px);
    align-items: center;
}
content-row[grid] {
    display: grid;
    box-sizing: content-box;
    grid-template-columns: repeat(auto-fit, minmax(250px,1fr)); /* MAGIC */
    grid-template-rows: auto;
    grid-auto-flow: column;
}
content-row[flex] {
    display: flex;
    flex-direction: row;
}
content-row[spread] { justify-content: space-between; }
content-row[spread] > :first-child { text-align: start; }
content-row[spread] > :last-child { text-align: end; }

/* responsive */
@media only screen and (min-width: 1024px) {
    :root {
        --responsive-mode: "lg";
    }
}

@media only screen and (min-width: 768px) and (max-width: 1023px) {
    :root {
        --responsive-mode: "md";
        --container-width: 720px;
    }
}

@media only screen and (max-width: 767px) {
    :root {
        --responsive-mode: "sm";
        --container-width: 92vw;
        --container-gutter: 4vw;
        --gutter-default: 10px;
    }
}