Lattice screen reveal

The source

A complete HTML document. Paste it into an empty .html file and it plays — no stylesheet, script, font, or image to fetch.

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Lattice screen reveal — ease-out</title>
<style>
:root {
  /* Neutrals — fixed, never remixed. */
  --ivory: #faf9f5;
  --paper: #ffffff;
  --oat: #e3dacc;
  --slate: #141413;

  /* Knobs — the remix API. A knob exists iff declared here and used below. */
  --hue: 38.8;
  --lift: 0;
  --chroma: 1;
  --round: 1;
  --speed: 1;

  /* Accents — derived from the knobs with the family's offsets baked in,
     so one hue roll moves them together. Defaults reproduce the original hex
     (#d97757 / #b85c3e / #788c5d / #b04a3f). */
  --clay: oklch(calc(0.6724 + var(--lift)) calc(0.1308 * var(--chroma)) var(--hue));
  --clay-d: oklch(calc(0.5797 + var(--lift)) calc(0.127 * var(--chroma)) var(--hue));
  --olive: oklch(calc(0.6118 + var(--lift)) calc(0.0713 * var(--chroma)) calc(var(--hue) + 88.3));
  --rust: oklch(calc(0.5408 + var(--lift)) calc(0.1357 * var(--chroma)) calc(var(--hue) - 10.3));

  /* Clock — every duration in the document runs off --t. */
  --cycle: 4.4s; /* the authored master loop */
  --t: calc(var(--cycle) / var(--speed));

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-accent: cubic-bezier(0.23, 1, 0.32, 1); /* the snippet's ONE characterful curve */

  /* File-specific: per-slat stagger step, kept on the master clock. */
  --_step: calc(0.055s / var(--speed));
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--ivory);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--slate);
}

.card {
  position: relative;
  width: min(360px, 88vw);
  padding: clamp(16px, 4.5vw, 22px);
  background: var(--paper);
  border: 1px solid var(--oat);
  border-radius: calc(14px * var(--round));
  overflow: hidden;
}

.rows {
  display: grid;
  gap: clamp(9px, 2.6vw, 12px);
}

.row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(9px, 2.6vw, 12px);
  opacity: 0;
  animation: row-in var(--t) var(--ease-out) infinite;
}

.row:nth-child(1) { animation-delay: calc(0.30s / var(--speed)); }
.row:nth-child(2) { animation-delay: calc(0.38s / var(--speed)); }
.row:nth-child(3) { animation-delay: calc(0.46s / var(--speed)); }

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--olive);
}
.row:nth-child(2) .dot { background: var(--clay); }
.row:nth-child(3) .dot { background: var(--oat); }

.bar {
  height: 8px;
  border-radius: 999px;
  background: var(--oat);
}
.row:nth-child(1) .bar { width: 82%; }
.row:nth-child(2) .bar { width: 64%; }
.row:nth-child(3) .bar { width: 73%; }

.tag {
  font-size: clamp(11px, 2.9vw, 12px);
  letter-spacing: 0.04em;
  color: var(--clay-d);
}

.caption {
  margin-top: clamp(14px, 3.6vw, 18px);
  font-size: clamp(11px, 2.9vw, 12px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
  opacity: 0.42;
}

/* The screen: thin slats that swing open on their own left edge. */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  pointer-events: none;
}

.slat {
  flex: 1 1 0;
  background: var(--ivory);
  border-right: 1px solid var(--oat);
  transform-origin: left center;
  animation: slat-part var(--t) var(--ease-accent) infinite;
}

.slat:nth-child(1) { animation-delay: calc(var(--_step) * 0); }
.slat:nth-child(2) { animation-delay: calc(var(--_step) * 1); }
.slat:nth-child(3) { animation-delay: calc(var(--_step) * 2); }
.slat:nth-child(4) { animation-delay: calc(var(--_step) * 3); }
.slat:nth-child(5) { animation-delay: calc(var(--_step) * 4); }
.slat:nth-child(6) { animation-delay: calc(var(--_step) * 5); }
.slat:nth-child(7) { animation-delay: calc(var(--_step) * 6); }
.slat:nth-child(8) { animation-delay: calc(var(--_step) * 7); }

/* 0–6% holds the closed screen, 6–17% is the ~500ms opening, the tail re-closes. */
@keyframes slat-part {
  0%, 6%   { transform: scaleX(1); opacity: 1; }
  17%, 84% { transform: scaleX(0.04); opacity: 0; }
  95%, 100% { transform: scaleX(1); opacity: 1; }
}

@keyframes row-in {
  0%, 5%   { opacity: 0; transform: translateY(6px); }
  18%, 82% { opacity: 1; transform: translateY(0); }
  92%, 100% { opacity: 0; transform: translateY(0); }
}

@media (max-width: 380px) {
  .card { padding: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  /* Screen stays parted; only a slow luminance breath survives. */
  .slat {
    animation: slat-fade calc(var(--t) * 2) var(--ease-out) infinite;
    animation-delay: 0s;
    transform: scaleX(0.04);
    opacity: 0;
  }
  .row {
    animation: row-breathe calc(var(--t) * 2) var(--ease-out) infinite;
    transform: none;
  }
  .row:nth-child(1) { animation-delay: 0s; }
  .row:nth-child(2) { animation-delay: calc(0.12s / var(--speed)); }
  .row:nth-child(3) { animation-delay: calc(0.24s / var(--speed)); }

  @keyframes slat-fade {
    0%, 100% { opacity: 0; }
  }
  @keyframes row-breathe {
    0%, 100% { opacity: 0.55; }
    50%      { opacity: 1; }
  }
}
</style>
</head>
<body>
  <div class="card">
    <div class="rows">
      <div class="row"><span class="dot"></span><span class="bar"></span><span class="tag">cedar</span></div>
      <div class="row"><span class="dot"></span><span class="bar"></span><span class="tag">stone</span></div>
      <div class="row"><span class="dot"></span><span class="bar"></span><span class="tag">paper</span></div>
    </div>
    <p class="caption">Contents loaded</p>

    <div class="screen" aria-hidden="true">
      <span class="slat"></span><span class="slat"></span><span class="slat"></span><span class="slat"></span>
      <span class="slat"></span><span class="slat"></span><span class="slat"></span><span class="slat"></span>
    </div>
  </div>
</body>
</html>

The variant family

Same idea, one axis moved. Compare them side by side before you commit.