@font-face {
    font-family: 'D-DIN';
    src: url('../fonts/D-DIN.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'D-DIN';
    src: url('../fonts/D-DIN-Bold.woff2') format('woff2');
    font-weight: bold;
    font-style: normal;
}

@font-face {
    font-family: 'D-DIN';
    src: url('../fonts/D-DIN-Italic.woff2') format('woff2');
    font-weight: normal;
    font-style: italic;
}

:root {
    --color-background: #e0fbfc; /* light cyan */
    --color-surface: #fff;
    --color-text: #374151;
    --color-heading: #3d5a80; /* bdazzled blue */
    --color-link: #c93d19; /* dark pastel red */
    --color-icon: #ee6c4d; /* burnt sienna */
}

/* The light mode heading and link colors fall below WCAG AA contrast on black */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #000;
        --color-surface: #000;
        --color-text: #fff;
        --color-heading: #98c1d9; /* pale cerulean */
        --color-link: #ee6c4d; /* burnt sienna */
    }
}

*,
::before,
::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: 'D-DIN', sans-serif;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    background-image: url('../img/topography.svg');
}

h1,
p,
ul {
    margin: 0;
}

.card {
    padding: 2rem;
    background-color: var(--color-surface);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -1px rgb(0 0 0 / 0.06);
}

header,
article {
    max-width: 65ch;
    margin-bottom: 2.5rem;
    line-height: 1.75;
}

h1 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.1111111;
    text-transform: uppercase;
    color: var(--color-heading);
}

article p {
    margin: 1.25em 0;
}

article p:first-child {
    margin-top: 0;
}

article p:last-child {
    margin-bottom: 0;
}

.lead {
    font-size: 1.5rem;
    line-height: 1.6666667;
}

article a {
    font-weight: 500;
    color: var(--color-link);
    text-decoration: underline;
}

footer ul {
    display: flex;
    gap: 1rem;
    padding: 0;
    list-style: none;
}

footer svg {
    display: block;
    width: 1.5rem;
    height: 1.5rem;
    fill: var(--color-icon);
}

@media (min-width: 768px) {
    body {
        display: grid;
        grid-template-columns: 1fr minmax(500px, 1fr);
        min-height: 100vh;
    }

    .card {
        grid-column: 2;
    }
}