Guest arrival ring (ghost)

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>Guest arrival ring — ghost</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: 3.6s;
  --t: calc(var(--cycle) / var(--speed));

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);

  /* File-specific — weight axis only. */
  --_ring-w: 1px;
  --_ring-open: 0.93;
  --_ring-wide: 1.0;
  --_chip-travel: 10%;
  --_dot-size: 5px;
  --_dot-dim: 0.1;
  --_stage: min(300px, 82vw);
}

* { 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 {
  width: min(360px, 92vw);
  padding: clamp(18px, 5vw, 26px);
  border-radius: calc(18px * var(--round));
  background: var(--paper);
  border: 1px solid var(--oat);
  display: grid;
  justify-items: center;
  gap: clamp(12px, 3.5vw, 18px);
}

.stage {
  position: relative;
  width: var(--_stage);
  height: calc(var(--_stage) * 0.52);
  display: grid;
  place-items: center;
}

.ring {
  position: absolute;
  width: calc(var(--_stage) * 0.42);
  height: calc(var(--_stage) * 0.42);
  border-radius: 50%;
  border: var(--_ring-w) solid var(--clay);
  opacity: 0;
  transform: scale(var(--_ring-open));
  animation: ring-open var(--t) var(--ease-out) infinite;
}

.ring.echo {
  border-color: var(--olive);
  animation-delay: calc(140ms / var(--speed));
}

@keyframes ring-open {
  0%      { transform: scale(var(--_ring-open)); opacity: 0; }
  14%     { transform: scale(var(--_ring-open)); opacity: 0.4; }
  46%     { transform: scale(var(--_ring-wide)); opacity: 0.24; }
  74%     { transform: scale(var(--_ring-wide)); opacity: 0.18; }
  92%     { transform: scale(var(--_ring-open)); opacity: 0; }
  100%    { transform: scale(var(--_ring-open)); opacity: 0; }
}

.chip {
  position: absolute;
  width: calc(var(--_stage) * 0.14);
  height: calc(var(--_stage) * 0.14);
  border-radius: 50%;
  background: transparent;
  border: var(--_ring-w) solid var(--clay-d);
  display: grid;
  place-items: center;
  opacity: 0;
  animation: chip-arrive var(--t) var(--ease-out) calc(90ms / var(--speed)) infinite;
}

.chip svg { width: 56%; height: 56%; display: block; }
.chip path { fill: none; stroke: var(--clay-d); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }

@keyframes chip-arrive {
  0%   { transform: translateX(calc(-1 * var(--_chip-travel))) scale(0.96); opacity: 0; }
  22%  { transform: translateX(0) scale(1); opacity: 0.6; }
  76%  { transform: translateX(0) scale(1); opacity: 0.6; }
  90%  { transform: translateX(0) scale(0.97); opacity: 0; }
  100% { transform: translateX(0) scale(0.97); opacity: 0; }
}

.seats {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.seat {
  position: absolute;
  width: var(--_dot-size);
  height: var(--_dot-size);
  border-radius: 50%;
  background: var(--rust);
  opacity: var(--_dot-dim);
  transform: rotate(var(--_a)) translateX(calc(var(--_stage) * 0.3)) rotate(calc(-1 * var(--_a)));
  animation: seat-fill var(--t) var(--ease-in-out) var(--_d) infinite;
}

.seat:nth-child(1) { --_a: -46deg; --_d: calc(360ms / var(--speed)); }
.seat:nth-child(2) { --_a: 0deg;   --_d: calc(420ms / var(--speed)); }
.seat:nth-child(3) { --_a: 46deg;  --_d: calc(480ms / var(--speed)); }

@keyframes seat-fill {
  0%   { opacity: var(--_dot-dim); }
  16%  { opacity: 0.5; }
  70%  { opacity: 0.5; }
  88%  { opacity: var(--_dot-dim); }
  100% { opacity: var(--_dot-dim); }
}

.label {
  font-size: clamp(11px, 3vw, 13px);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate);
  opacity: 0.4;
}

@media (max-width: 380px) {
  .card { padding: 14px; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .ring {
    transform: scale(1);
    animation: ring-hold calc(var(--t) * 2.2) var(--ease-in-out) infinite;
  }
  .ring.echo { animation-delay: calc(300ms / var(--speed)); }
  .chip {
    transform: none;
    animation: soft-hold calc(var(--t) * 2.2) var(--ease-in-out) calc(200ms / var(--speed)) infinite;
  }
  .seat {
    transform: rotate(var(--_a)) translateX(calc(var(--_stage) * 0.3)) rotate(calc(-1 * var(--_a)));
    animation: seat-fill calc(var(--t) * 2.2) var(--ease-in-out) var(--_d) infinite;
  }
  @keyframes ring-hold {
    0%, 100% { opacity: 0.16; }
    50%      { opacity: 0.4; }
  }
  @keyframes soft-hold {
    0%, 100% { opacity: 0.3; }
    50%      { opacity: 0.62; }
  }
}
</style>
</head>
<body>
  <div class="card">
    <div class="stage">
      <div class="ring"></div>
      <div class="ring echo"></div>
      <div class="seats">
        <span class="seat"></span>
        <span class="seat"></span>
        <span class="seat"></span>
      </div>
      <div class="chip">
        <svg viewBox="0 0 24 24" aria-hidden="true">
          <path d="M12 4.5a3.4 3.4 0 1 1 0 6.8 3.4 3.4 0 0 1 0-6.8Z" />
          <path d="M4.8 19.4c0-3.3 3.2-5.3 7.2-5.3s7.2 2 7.2 5.3" />
        </svg>
      </div>
    </div>
    <div class="label">Someone is joining</div>
  </div>
</body>
</html>

The variant family

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