@font-face {
  font-family: "Fira mono";
  src: url("../fonts/fira-mono/FiraMono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "Fira mono";
  src: url("../fonts/fira-mono/FiraMono-Medium.ttf") format("truetype");
  font-weight: 500;
  font-style: normal;
}

@font-face {
  font-family: "Fira mono";
  src: url("../fonts/fira-mono/FiraMono-Bold.ttf") format("truetype");
  font-weight: 600;
  font-style: bold;
}

:root {
  --line-height: 16pt;
  --font-size: 11pt;
}

html, body {
  font-family: "Fira mono";
  font-size: var(--font-size);
  line-height: var(--line-height);
}

body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: min-content 1fr;
  height: 100vh;
  box-sizing: border-box;
}

h1, h2 {
  display: block;
  letter-spacing: 0.25em;
  font-weight: 500;
}

h1 {
  margin-bottom: var(--line-height);
}

aside h2 {
  padding: .5rem 1.5rem .5rem 1.5rem;
  border-bottom: 1px solid black;
}

h3 {
  letter-spacing: .05em;
  text-decoration: underline;
  cursor: pointer;
}

p {
  max-width: 80ch;
  margin-bottom: var(--line-height);
}

main {
  grid-column: 1;
  padding: var(--line-height) calc(3 * var(--line-height)) var(--line-height) calc(2 * var(--line-height));
  overflow-y: auto;
}

main, nav {
  border-right: 1px solid black;
}

nav {
  grid-column: 1;
}

aside {
  grid-column: 2;
  grid-row: 1 / 3;
  overflow-y: auto;
}

summary {
  padding: calc(.5 * var(--line-height)) 0;
  list-style: none;
  border: none;
  outline: none;
}

.read-online-link {
  letter-spacing: .1em;
}

dd.read-online-link {
  margin-top: calc(var(--line-height) * .425);
}

dd.read-online-link a {
  text-decoration-style: solid;
}

details > summary::-webkit-details-marker {
  display: none;
}

details {
  border-bottom: 1px solid black;
  padding: calc(.5 * var(--line-height)) calc(2.5 * var(--line-height)) calc(.5 * var(--line-height)) var(--line-height);
}

details[open] {
  padding-bottom: calc(2.5 * var(--line-height));
}

details[open] > summary {
  margin-bottom: calc(var(--line-height) * .5);
}

details + details {
  margin-top: -1px;
}

a {
  color: currentColor;
}

a:hover {
  text-decoration: none;
}

dl {
  margin: var(--line-height) 0 0 0;
  display: grid;
  grid-template-columns: 15ch 1fr;
  max-width: 80ch;
  font-size: 85%;
}

dl a {
  text-decoration-style: dotted;
}

summary dl {
  margin-top: calc(var(--line-height) * .425);
}

strong {
  font-weight: 500;
}


img {
  max-width: 75%;
  display: block;
  margin: var(--line-height) 0;
}

ul#nav {
  display: flex;
  flex-direction: row;
  border-bottom: 1px solid black;
}

ul#nav li {
  border-right: 1px solid black;
  padding: .5em 1.5em;
  flex: 1 0;
}

ul#nav li:last-child {
  border-right: 0;
}

ul#nav li a {
  text-decoration: none;
  /* text-transform: uppercase; */
  /* font-weight: 500; */
  letter-spacing: .25px;
  white-space: nowrap;
}

main li:before,
aside li:before {
  content: '*';
  float: left;
  margin-right: 1em;
}

@media screen and (min-width: 601px) {
  summary::after {
    content: "Show details ↓";
    font-size: 85%;
    margin-top: calc(var(--line-height) * .425);
    display: block;
    cursor: pointer;
    margin-left: 15ch;
  }

  [open] > summary::after {
    content: "Hide details ↑";
  }

  .research details {
    position: relative;
  }

  .research summary::after {
    content: "Show questions ↓";
    position: absolute;
    right: 1.5rem;
    top: 1rem;
  }

  .research [open] > summary::after {
    content: "Hide questions ↑";
  }
}

@media screen and (max-width: 600px) {
  body {
    display: block;
    padding: var(--line-height) calc(2 * var(--line-height)) var(--line-height) var(--line-height);
    height: initial;
    box-sizing: border-box;
  }

  main, aside {
    padding: 0;
    height: initial;
    overflow-y: initial;
  }

  main {
    border-right: none;
  }

  dl {
    display: initial;
  }

  dt {
    margin-top: calc(var(--line-height) * .425);
  }

  dt::after {
    content: ':';
  }

  dt:empty::after {
    content: '';
  }
  
  details, details[open] {
    padding-left: calc(1 * var(--line-height));
    padding-right: calc(2 * var(--line-height));
    padding-bottom: var(--line-height);
    border-bottom: 0;
    border-top: 1px solid black;
    margin-left: calc(-1 * var(--line-height));
    margin-right: calc(-2 * var(--line-height));
  }

  details {
    max-height: 50vh;
    position: relative;
    overflow-y: hidden;
  }

  details[open] {
    max-height: initial;
  }

  details:not([open]) summary::after {
    display: block;  
    content: 'show details ↓';
    position: absolute;
    bottom: 0px;
    left: 0;
    right: 0;
    height: calc(3.5 * var(--line-height));
    z-index: 1;
    background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,1) calc(2 * var(--line-height)));
    box-sizing: border-box;
    font-size: 85%;
    padding: calc(2 * var(--line-height)) 0 0 var(--line-height);
    /* pointer-events: none; */
  }

  details[open]::after {
    content: none;
  }

  [open] > summary::after {
    content: "Hide details ↑";
    font-size: 85%;
    margin-top: calc(var(--line-height) * .85);
    display: block;
    cursor: pointer;
  }
  
  .research details:not([open]) summary::after {
    content: "Show questions ↓";
    background: none;
    
  }

  .research [open] > summary::after {
    content: "Hide questions ↑";
  }

  nav {
    margin: calc(-1 * var(--line-height)) calc(-2 * var(--line-height)) var(--line-height) calc(-1 * var(--line-height));
    overflow-x: hidden;
    border-right: none;
  }

  ul#nav {
    flex-wrap: wrap;
    border-bottom: none;
    margin-right: -1px;
  }

  ul#nav li {
    border-bottom: 1px solid black;
  }

  aside h2 {
    padding: .5em 0;
    border-bottom: none;
  }
}