:root {
  --bg: #000;
  --fg: #e6e6e6;
}

:root.light {
  --bg: #fff;
  --fg: #1a1a1a;
}

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

/* MathJax can still use its own math fonts */
html,
button {
  font-family: "JetBrains Mono", monospace;
}

html,
body {
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
}

body {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 100vh;
  padding: 112px 16px 64px;
}

/* Invisible banner: scrolling text disappears under it */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 110px;
  background: var(--bg);
  z-index: 1;
}

main {
  width: 100%;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.7;
}

main p + p {
  margin-top: 1.7em;
}

main h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

main p + h2,
main ol + h2,
main ul + h2,
main .media + h2 {
  margin-top: 1.7em;
}

.media {
  display: block;
  width: 100%;
  margin-top: 1.7em;
  --plyr-color-main: var(--fg);
}

.covers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem;
}

.covers img {
  display: block;
  width: 100%;
  height: auto;
}

.stills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.25rem;
}

.stills a {
  display: block;
}

.stills a:hover,
:root.light .stills a:hover {
  background: none;
}

.stills img {
  display: block;
  width: 100%;
  height: auto;
}

.stills figcaption {
  margin-top: 0.6em;
  font-size: 14px;
  line-height: 1.5;
}

.video-fallback {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
}

main ol,
main ul {
  margin-top: 1em;
  padding-left: 3ch;
}

main li + li {
  margin-top: 1em;
}

.item {
  display: flex;
  justify-content: space-between;
  gap: 3ch;
}

.item-warning {
  margin-top: 0.5em;
  font-size: 14px;
}

.item-warning summary {
  cursor: pointer;
}

.item-warning p {
  margin-top: 0.5em;
}

.item-links {
  flex-shrink: 0;
  text-align: right;
  margin-right: -25ch;
}

a {
  color: inherit;
  text-decoration: underline;
}

a:hover {
  background: #fff;
  color: #000;
}

:root.light a:hover {
  background: #000;
  color: #fff;
}

#site-header {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 2;
}

#site-title {
  font-size: 32px;
  line-height: 40px;
  /* 16px top + 40px title + 56px = 112px, where the page content starts */
  margin-bottom: 56px;
}

#site-header h2 {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.7;
}

/* Menu labels: .label-narrow replaces .label-wide on small screens */
#site-header .label-narrow {
  display: none;
}

/* Current page: highlighted the same way as a hovered link */
#site-header a[aria-current="page"] {
  background: #fff;
  color: #000;
}

:root.light #site-header a[aria-current="page"] {
  background: #000;
  color: #fff;
}

#theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 2;
  background: none;
  border: none;
  color: var(--fg);
  font-size: 40px;
  line-height: 1;
  cursor: pointer;
}

/* Narrow screens: the fixed side menu would overlap the text, so put the
   header in the page flow above main and list the menu horizontally */
@media (max-width: 900px) {
  body {
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 16px 16px 64px;
  }

  body::before {
    display: none;
  }

  #site-header {
    position: static;
    width: 100%;
    max-width: 70ch;
    display: flex;
    flex-wrap: wrap;
    column-gap: 2ch;
    margin-bottom: 32px;
  }

  #site-title {
    flex-basis: 100%;
    /* Leave room for the theme toggle in the top right corner */
    padding-right: 48px;
    margin-bottom: 16px;
  }

  #theme-toggle {
    position: absolute;
  }

  .item-links {
    margin-right: 0;
  }

  #site-header .label-wide {
    display: none;
  }

  #site-header .label-narrow {
    display: inline;
  }
}