:root {
  color-scheme: dark;
  background: #000;
  font-family: sans-serif;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: #000;
}

body { display: grid; place-items: center; }

.viewport {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: #000;
  outline: none;
  touch-action: pan-x pinch-zoom;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  isolation: isolate;
}

@media (min-width: 600px) {
  .viewport { width: min(100vw, 56.25vh); width: min(100vw, 56.25dvh); }
}

.track {
  position: absolute;
  inset: 0;
  will-change: transform;
  transform: translate3d(0, 0, 0);
}

.post {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #000;
  contain: paint;
}

.post video {
  position: absolute;
  /* Overscan covers the maximum 8px shift and the 0.99 minimum scale. */
  top: 50%;
  left: 50%;
  width: 104%;
  height: 104%;
  min-width: calc(100% + 24px);
  min-height: calc(100% + 24px);
  object-fit: cover;
  transform: translate(-50%, -50%) translate3d(var(--shift-x), var(--shift-y), 0) scale(var(--scale));
  filter: brightness(var(--brightness)) saturate(var(--saturation));
  pointer-events: none;
}

.post::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--temperature);
  opacity: var(--warmth);
  mix-blend-mode: soft-light;
  pointer-events: none;
}

video::-webkit-media-controls { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .track { scroll-behavior: auto; }
}