@font-face {
    font-family: 'PTSansNarrow';
    src: url('fonts/PTSansNarrow-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'PTSansNarrow';
    src: url('fonts/PTSansNarrow-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

:root {
    --color-bg: #1e1e1e;
    --color-fg: #f5f5f7;
    --color-muted: #86868b;
    --color-border: #2c2c2e;
    --color-accent: #0a84ff;
    --color-header-bg: #232323;
    --color-link: #2997ff;
    --color-link-hover: #64d2ff;
    --gap: 1rem;
    --font-default: 'PTSansNarrow', 'PT Sans Narrow', sans-serif-condensed, sans-serif;
    --font-default-weight: 400;
    --font-size: 18px;

    /* Theme text color variables */
    --color-header-text: #f5f5f7;
    --color-heading: #e5e5ea;
    --color-heading-secondary: #b0b0b5;
    --color-em: #86868b;
    --color-regular: #e1e1e3;
}

@media (prefers-color-scheme: light) {
    :root {
        --color-bg: #ffffff;
        --color-fg: #1d1d1f;
        --color-muted: #6e6e73;
        --color-border: #d1d1d6;
        --color-accent: #007aff;
        --color-link: #0066cc;
        --color-link-hover: #32ade6;
        --gap: 1rem;

        /* Light theme overrides */
        --color-header-text: #1d1d1f;
        --color-heading: #1d1d1f;
        --color-heading-secondary: #44444a;
        --color-em: #6e6e73;
        --color-regular: #232325;
    }

    .logo {
        background: var(--color-fg);
    }
}

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

html, body {
    font-size: var(--font-size);
    font-family: var(--font-default), sans-serif-condensed, sans-serif;
    font-weight: var(--font-default-weight);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--color-bg);
    color: var(--color-fg);
    background-color: var(--color-border);
    display: grid;
    place-items: center;
    padding: var(--gap);
}

main {
    display: grid;
    grid-gap: var(--gap);
    place-items: center left;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 0.3rem;
    max-width: 968px;
    padding: 1.5rem 2rem 2rem 2rem;
    width: 100%;
}

main > * {
    width: 100%;
}

header {
    color: var(--color-header-text);
}

header h1 a {
    color: var(--color-header-text);
    font-size: xx-large;
    font-weight: 900;
}

h1 {
    color: var(--color-heading);
}

h2, h3, h4 {
    color: var(--color-heading-secondary);
}

ul, ol {
    list-style: square;
    margin-left: 0.9rem;
    color: var(--color-regular);
}

a {
    color: var(--color-link);
    text-decoration: underline;
    transition: color 0.2s;
    cursor: pointer;
}

a:hover {
    color: var(--color-link-hover);
}

em {
    color: var(--color-em);
}

.cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--gap);
    margin: var(--gap) 0;
}

.col {
}

.call-to-action {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: var(--gap);
}

.call-to-action a {
    display: block;
    font-weight: 900;
    font-size: 1.2rem;
    background: var(--color-link);
    color: var(--color-bg);
    padding: 0.6rem 0.9rem;
    border-radius: 0.3rem;
    text-decoration: none;
    text-align: center;
}

.call-to-action a:hover,
.call-to-action a:focus {
    background: var(--color-accent);
    color: var(--color-bg);
}

.call-to-action a:active {
    background: var(--color-accent);
    color: var(--color-bg);
}

hr {
    border: none;
    border-top: 1px dotted var(--color-border);
    margin: var(--gap) 33% var(--gap) 3%;
    height: 0;
    background: transparent;
}

.logo {
    height: 2.2em;
    vertical-align: middle;
    margin-right: 0.5em;
}

@media (max-width: 640px) {
    body {
        padding: 0;
    }

    .cols {
        grid-template-columns: 1fr;
    }

    .col {
        margin-bottom: var(--gap);
    }
}