@font-face {
  font-family: 'Reenie Beanie';
  src: url('./assets/fonts/ReenieBeanie.ttf') format('truetype');
  font-style: normal;
  font-weight: 400;
  font-display: block;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: Georgia, serif;
}

.quantum-page {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  /* Match the homepage's gutters and its scaled 76px top spacing. */
  padding: calc(100vw * 76 / 1875) max(20px, 7.125vw) 64px;
  background-image: url('./assets/paper-texture.png');
  background-size: 400px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mute);
  font: 400 clamp(22px, 1.6vw, 30px)/1.2 'Reenie Beanie', cursive;
  text-decoration: none;
}

.back-link svg { width: 20px; height: 13px; flex-shrink: 0; }
.back-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.back-link:focus-visible { outline: 2px solid var(--d2); outline-offset: 5px; }

h1 {
  margin: 40px 0 0;
  font: 400 clamp(32px, 3.84vw, 72px)/1.1 'Reenie Beanie', cursive;
}

.quantum-gallery {
  display: grid;
  grid-template-columns: 4fr 3fr;
  align-items: start;
  gap: clamp(18px, 2.4vw, 40px);
  width: min(100%, 1000px);
  margin-top: clamp(28px, 3vw, 48px);
}

.quantum-gallery figure {
  position: relative;
  isolation: isolate;
  min-width: 0;
  margin: 0;
}

.quantum-photo {
  --paper-opening: url('./assets/quantum/photo-paper-mask.svg');
  --paper-rim: url('./assets/quantum/photo-paper-rim.svg');
}

.quantum-video {
  --paper-opening: url('./assets/quantum/video-paper-mask.svg');
  --paper-rim: url('./assets/quantum/video-paper-rim.svg');
}

.quantum-gallery img,
.quantum-gallery video {
  display: block;
  width: 100%;
  height: auto;
  -webkit-mask: var(--paper-opening) center / 100% 100% no-repeat;
  mask: var(--paper-opening) center / 100% 100% no-repeat;
}

.quantum-gallery figure::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--paper-rim) center / 100% 100% no-repeat;
  pointer-events: none;
}

.quantum-video:focus-within {
  outline: 2px solid var(--d2);
  outline-offset: 5px;
}

.atom-annotation {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.atom-circle {
  stroke: #f4ece0;
  stroke-width: 2.3;
  opacity: .94;
}

.pen-retrace { stroke-width: .85; opacity: .52; }
.atom-arrow { stroke: #49453f; stroke-width: 2.1; }
.ink-on-video { stroke: #f4ece0; }
.atom-arrow-below { display: none; }

.atom-label {
  position: absolute;
  z-index: 3;
  top: 32.5%;
  left: calc(100% + 96px);
  width: 210px;
  color: #49453f;
  font: 400 36px/1.05 'Reenie Beanie', 'Segoe Print', cursive;
  transform: rotate(-4deg);
  transform-origin: left center;
}

@media (max-width: 1600px) {
  .atom-arrow-side { display: none; }
  .atom-arrow-below { display: block; }
  .quantum-gallery .quantum-video { margin-bottom: 110px; }
  .atom-label {
    top: calc(100% + 58px);
    left: 0;
    width: 100%;
    font-size: clamp(24px, 2.8vw, 32px);
    text-align: center;
    transform-origin: center;
  }
}

@media (max-width: 560px) {
  .quantum-gallery { grid-template-columns: 1fr; gap: 28px; }
}