/* The home page: a column of text over the automata, which keep drawing behind it.
   A click anywhere draws, on the words too, but the words can still be selected by
   dragging, and links are only links. Opening the toolbar puts the page away. */

:root[data-site] {
  --ground: #121211;
  --text: #ebe9e2;
  --text-2: rgb(235 233 226 / 0.74);
  --text-3: rgb(235 233 226 / 0.55);
  --rule: rgb(235 233 226 / 0.3);
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --col: 33rem;
  --left: clamp(24px, 9vw, 168px);
}

/* The page scrolls if it has to, over a world that stays put. */
html[data-site],
html[data-site] body {
  height: auto;
  min-height: 100%;
}

html[data-site] body {
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--ground);
}

/* When the words fit, the page is exactly the window: no scrolling, and no bouncing either. */
html[data-site] {
  overscroll-behavior: none;
}

html[data-site].fits body,
html[data-site]:not(.toolbar-folded) body {
  overflow: hidden;
}

/* Under the page the world is something to click, not a tool: an ordinary cursor, and swipes scroll. */
html[data-site].toolbar-folded #overlay {
  cursor: default;
  touch-action: pan-y pinch-zoom;
}

.site {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 4vh 24px 4vh var(--left);
  /* Clicks between and around the words fall through to the world. */
  pointer-events: none;
  color: var(--text-2);
  font: 400 1.125rem/1.6 var(--serif);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  /* A breath of the ground around each letter, so the words stay clear over whatever is drawn behind them. */
  text-shadow: 0 0 1px var(--ground), 0 0 4px var(--ground), 0 0 10px rgb(18 18 17 / 0.85);
  transition: opacity 0.35s ease, visibility 0.35s;
}

html[data-site]:not(.toolbar-folded) .site {
  opacity: 0;
  visibility: hidden;
}

.column {
  width: 100%;
  max-width: var(--col);
  /* Shown once the words have arrived, so nothing jumps into place. */
  opacity: 0;
  transition: opacity 0.25s ease;
}

.column.ready {
  opacity: 1;
}

/* The words take their own clicks, so they can be selected; site.js passes plain clicks on to the world. */
.about,
.portrait {
  pointer-events: auto;
}

::selection {
  background: rgb(157 147 207 / 0.4);
  color: var(--text);
  text-shadow: none;
}

.portrait {
  display: block;
  width: 8rem;
  height: 8rem;
  /* The drawing has room around it; this lines its edge up with the text. */
  margin: 0 0 1.25rem -1.2rem;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.portrait img {
  display: block;
  width: 100%;
  height: 100%;
  /* Black strokes on clear, drawn here in the text's off-white. */
  filter: invert(0.93);
  opacity: 0.9;
  transition: opacity 0.3s ease;
}

.portrait.gone img {
  opacity: 0;
}

@media (hover: hover) {
  .portrait:hover img {
    opacity: 1;
  }
}

.portrait:focus-visible {
  outline: 1px solid var(--rule);
  outline-offset: 2px;
}

.about h1 {
  margin: 0 0 1.5rem;
  color: var(--text);
  font: 400 2.75rem/1.1 var(--serif);
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.about p,
.about ul,
.about ol {
  margin: 0 0 0.9em;
  text-wrap: pretty;
}

/* A line that introduces a list ("Currently, I'm:") is a drop-down, in the brighter ink. Its
   chevron hangs in the margin with the lists' dashes, and turns down when the list opens. */
.about details {
  margin: 0 0 0.35em;
}

.about details[open] {
  margin-bottom: 0.9em;
}

.about summary {
  position: relative;
  display: block;
  width: fit-content;
  max-width: 100%;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

.about summary::-webkit-details-marker {
  display: none;
}

.about summary::before {
  content: "";
  position: absolute;
  top: 0.8em;
  right: calc(100% + 0.68em);
  width: 0.34em;
  height: 0.34em;
  border-right: 1px solid var(--text-3);
  border-bottom: 1px solid var(--text-3);
  transform: translateY(-50%) rotate(-45deg);
  transition: transform 0.15s ease, border-color 0.15s;
}

.about details[open] > summary::before {
  transform: translateY(-75%) rotate(45deg);
}

@media (hover: hover) {
  .about summary:hover::before {
    border-color: var(--text);
  }
}

.about summary:focus-visible {
  outline: 1px solid var(--rule);
  outline-offset: 3px;
}

.about details > ul,
.about details > ol {
  margin: 0.3em 0 0;
  animation: unfold 0.2s ease;
}

@keyframes unfold {
  from {
    opacity: 0;
    transform: translateY(-3px);
  }
}

/* Lists hang their markers in the margin, so their words line up with the paragraphs'. */
.about ul,
.about ol {
  padding: 0;
  list-style: none;
  line-height: 1.5;
}

.about li {
  position: relative;
}

.about li + li {
  margin-top: 0.2em;
}

.about ul > li::before,
.about ol > li::before {
  position: absolute;
  right: calc(100% + 0.55em);
  color: var(--text-3);
}

.about ul > li::before {
  content: "–";
}

.about ol {
  counter-reset: item;
}

.about ol > li {
  counter-increment: item;
}

.about ol > li::before {
  content: counter(item) ".";
  font-variant-numeric: tabular-nums;
}

/* Sections, should the page grow some. */
.about h2,
.about h3 {
  margin: 1.8em 0 0.5em;
  color: var(--text);
  font: 400 1.35rem/1.25 var(--serif);
}

.about h3 {
  font-size: 1.125rem;
}

.about em {
  font-style: italic;
}

.site a {
  /* A little more to hit than the letters, so a click that just misses a link still lands on it. */
  padding: 0.2em 0;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: text-decoration-color 0.15s;
}

@media (hover: hover) {
  .site a:hover {
    text-decoration-color: var(--text);
  }
}

.site a:focus-visible {
  outline: 1px solid var(--rule);
  outline-offset: 3px;
}

/* The row of links, and the postscript: set small, in the instrument's own type. */
.about .elsewhere,
.about .aside {
  font: 400 0.8125rem/1.5 var(--mono);
  letter-spacing: 0.01em;
}

.about .elsewhere {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.6rem;
  margin: 2rem 0 0;
}

.about .elsewhere a {
  margin: -0.35em 0;
  padding: 0.35em 0;
  text-underline-offset: 0.35em;
}

.about .aside {
  margin: 2.5rem 0 0;
  color: var(--text-3);
}

.about .aside + .aside {
  margin-top: 0.4rem;
}

.about .aside a {
  color: inherit;
}

.noscript {
  position: relative;
  z-index: 2;
  margin: 0;
  padding: 0 24px 6vh var(--left);
  color: var(--text-3);
  font: 400 0.8125rem/1.5 var(--mono);
}

/* A shorter window, like a laptop's, gets a slightly smaller page so it still fits. */
@media (max-height: 820px) and (min-width: 641px) {
  .site {
    font-size: 1.0625rem;
    line-height: 1.52;
  }
  .about p {
    margin-bottom: 0.75em;
  }
  .portrait {
    width: 5.25rem;
    height: 5.25rem;
    margin: 0 0 0.9rem -0.8rem;
  }
  .about h1 {
    margin-bottom: 1.1rem;
    font-size: 2.4rem;
  }
  .about .elsewhere,
  .about .aside {
    margin-top: 1.4rem;
  }
}

/* On a narrow screen the column takes the width, below the folded toolbar. */
@media (max-width: 640px) {
  .site {
    align-items: flex-start;
    padding: calc(76px + env(safe-area-inset-top)) 24px calc(40px + env(safe-area-inset-bottom));
    font-size: 1.0625rem;
  }
  .portrait {
    width: 6.5rem;
    height: 6.5rem;
    margin-left: -1rem;
  }
  .about h1 {
    font-size: 2.25rem;
  }
}