:root {
  --ink: #000;
  --paper: #fff;
  --muted: #555;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --pixel: "Tiny5", var(--mono);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
}

#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  z-index: -1;
}

main {
  margin: 0 auto;
  padding: 64px 16px 32px;
}

/* Text lives on white cards, so the dithering never sits behind it. */
.card {
  max-width: 680px;
  margin: 0 auto 40px;
  padding: 28px 32px;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}

@media (max-width: 600px) {
  main {
    padding-top: 24px;
  }
  .card {
    padding: 20px 18px;
    box-shadow: 4px 4px 0 var(--ink);
  }
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin: 0 0 0.6em;
}

h1 {
  font-family: var(--pixel);
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  font: 600 26px/1.2 var(--pixel);
  text-transform: uppercase;
  margin: 0 0 1em;
}

h3 {
  font-size: 18px;
  font-weight: 600;
}

p {
  margin: 0 0 1em;
}

.card > :last-child,
li > :last-child {
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

a:hover {
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

code {
  font: 0.9em var(--mono);
  background: #ddd;
  padding: 0.1em 0.3em;
  white-space: nowrap;
}

.kicker {
  font: 13px var(--pixel);
  text-transform: uppercase;
  margin-bottom: 1.2em;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  margin-top: 1.4em;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  font: 600 18px var(--pixel);
  text-decoration: none;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 #bbb;
}

.button:hover {
  background: var(--paper);
  color: var(--ink);
}

.button:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #bbb;
}

/* The camera's preset tag, top right on every photo. */
.tag {
  display: inline-block;
  min-width: 3.4em;
  padding: 2px 6px;
  font: 14px/1.4 var(--pixel);
  text-align: center;
  color: var(--paper);
  background: var(--ink);
}

/* rnd, in the 7-segment lowercase of the camera's display. */
.tag svg {
  height: 0.86em;
  vertical-align: -0.08em;
  fill: currentColor;
}

.presets {
  list-style: none;
  padding: 0;
  margin: 0 0 1em;
}

.presets li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 6px 0;
}

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  margin-top: 24px;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 52px;
  margin-bottom: 28px;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -6px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font: 18px var(--pixel);
  color: var(--paper);
  background: var(--ink);
}

.steps > li:last-child {
  margin-bottom: 0;
}

.download {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin: 4px 0 1.2em;
}

.download span {
  font: 13px var(--mono);
  color: var(--muted);
}

@media (max-width: 600px) {
  .steps > li {
    padding-left: 44px;
  }
  .steps > li::before {
    width: 30px;
    height: 30px;
    font-size: 16px;
  }
}

.note {
  color: var(--muted);
  font-size: 15px;
}

/* Justified rows: every photo keeps its own aspect ratio. */
.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 1720px;
  margin: 0 auto 48px;
}

.gallery::after {
  content: "";
  flex-grow: 999;
}

.gallery a {
  display: block;
  flex-grow: calc(var(--w) / var(--h));
  flex-basis: calc(var(--w) / var(--h) * 200px);
  background: none;
  transition: transform 80ms steps(2), box-shadow 80ms steps(2);
}

.gallery a:hover,
.gallery a:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--ink);
  outline: 2px solid var(--ink);
}

.gallery img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

@media (max-width: 600px) {
  .gallery {
    gap: 8px;
  }
  .gallery a {
    flex-basis: calc(var(--w) / var(--h) * 110px);
  }
}

footer {
  text-align: center;
  font: 13px var(--pixel);
  text-transform: uppercase;
}

footer p {
  display: inline-block;
  padding: 6px 10px;
}

dialog {
  padding: 0;
  border: 2px solid var(--ink);
  box-shadow: 8px 8px 0 var(--ink);
  max-width: min(1280px, calc(100vw - 32px));
  background: var(--paper);
  overflow: visible;
}

dialog::backdrop {
  background: rgb(255 255 255 / 0.6);
}

dialog img {
  display: block;
  width: min(1280px, calc(100vw - 36px), calc((100vh - 64px) * 1.5));
  height: auto;
  image-rendering: pixelated;
}

dialog form {
  position: absolute;
  top: -18px;
  right: -18px;
}

dialog button {
  width: 36px;
  height: 36px;
  font: 22px/1 var(--mono);
  color: var(--paper);
  background: var(--ink);
  border: 2px solid var(--paper);
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  .gallery a {
    transition: none;
  }
}