/** Variables */

:root {
  --colour-primary-10: #060300;
  --colour-primary-20: #1f1400;
  --colour-primary-30: #3c2b00;
  --colour-primary-40: #5c4300;
  --colour-primary-50: #7f5d00;
  --colour-primary-60: #a37800;
  --colour-primary-70: #c89500;
  --colour-primary-80: #efb300;
  --colour-primary-90: #ffd98c;
  --colour-primary-95: #ffecc8;

  --colour-hyperlink-10: #000409;
  --colour-hyperlink-20: #001829;
  --colour-hyperlink-30: #00314d;
  --colour-hyperlink-40: #004d75;
  --colour-hyperlink-50: #006a9f;
  --colour-hyperlink-60: #1388c9;
  --colour-hyperlink-70: #41a8ea;
  --colour-hyperlink-80: #78c7ff;
  --colour-hyperlink-90: #bfe3ff;
  --colour-hyperlink-95: #e0f1ff;

  --colour-primary-fg: var(--colour-primary-90);
  --colour-primary-bg: var(--colour-primary-10);
  --colour-hyperlink: var(--colour-hyperlink-80);

  --font-size-sm: 1rem;
  --font-size-base: 1.1rem;
  --font-size-md: 1.2rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;

  --spacing-block-sm: 0.75rem;
  --spacing-block-md: 1.5rem;
  --spacing-block-lg: 2.5rem;
  --spacing-block-xl: 5rem;
  --spacing-inline-sm: 0.5rem;
  --spacing-inline-md: 1.5rem;
  --spacing-inline-lg: 3rem;
  --spacing-inline-xl: 6rem;
}

/** Light theme */
@media (prefers-color-scheme: light) {
  :root {
    --colour-primary-fg: var(--colour-primary-20);
    --colour-primary-bg: var(--colour-primary-95);
    --colour-hyperlink: var(--colour-hyperlink-40);
  }
}

/** Base typography */

body {
  font-size: var(--font-size-base);
  color: var(--colour-primary-fg);
  background-color: var(--colour-primary-bg);
  line-height: 1.5;

  /* Geometric Humanist stack from https://modernfontstacks.com */
  font-family: Avenir, Montserrat, Corbel, 'URW Gothic', source-sans-pro, sans-serif;
}

small {
  font-size: var(--font-size-sm);
}

:is(p, h1, h2, h3, h4, h5, h6) {
  margin-block-start: var(--spacing-block-sm);
  max-width: 30rem;
}

/** Base layout */

body {
  margin-inline: var(--spacing-block-lg);
  margin-block-end: var(--spacing-block-xl);

  :is(h1, h2, h3, h4, h5, h6) {
    text-align: center;
  }

  img {
    margin-inline: auto;
  }
}

@media (min-width: 36rem) {
  body {
    display: grid;
    grid-template-columns: [media-start] 6rem [content-start] 1fr [content-end];
    margin-inline-end: 6rem;
		column-gap: var(--spacing-block-sm);
    max-width: calc(6rem + var(--spacing-block-sm) + 30rem);

    :is(main, article, nav) {
      display: grid;
      grid-column: media-start / content-end;
      grid-template-columns: subgrid;
    }

    :is(section, header, aside) {
      grid-column: content-start / content-end;
    }

    :is(h1, h2, h3, h4, h5, h6) {
      text-align: start;
    }
  }
}

/** Headings */

h1 {
  font-size: var(--font-size-xl);
  font-weight: 900;
  margin-block-start: 0;
}

h2 {
  font-size: var(--font-size-lg);
  font-weight: 900;
  margin-block-start: var(--spacing-block-xl);
}

h3, h4, h5, h6 {
  font-size: var(--font-size-md);
  font-weight: 600;
}

/** Hyperlinks */

a:is(:link, :visited) {
  color: var(--colour-hyperlink);
  text-decoration: underline;
  display: inline;

  :hover {
    text-decoration: wavy;
  }
}

/** Navigation bar */

nav {
  margin-block: var(--spacing-block-sm);

  ul {
    grid-column: media-start / content-end;
    display: flex;
    justify-content: center;
    gap: var(--spacing-inline-md);
    list-style: none;
  }
}

@media (min-width: 36rem) {
  nav {
    display: grid;
    grid-template-columns: subgrid;

    ul {
      justify-content: end;
    }
  }
}

/** Blog feed */

.h-feed {
	ul {
		list-style: none;
	}
}

/** Block quotes */
blockquote {
  padding-inline-start: var(--spacing-inline-lg);
  border-inline-start: 2px solid var(--colour-primary-fg);
  font-style: italic;

  footer {
    font-style: initial;
  }

  :is(em, i) {
    font-style: normal;
  }
}

/** Small caps */
.small-caps {
  font-variant: small-caps;
}