Glass Cards

The signature liquid-glass card system: frosted translucent panels with a neon gradient border and a glass shine, sitting on a dark gradient background with a drifting glow and dot grid — where one card zooms/rises forward to play its content, then falls back to the grid as the next rises, all under a gentle camera zoom-in → settle. Drop-in via assets/glass.css + assets/glass.js.

Pieces (pick what you need)

• Animated background — .stage (dark multi-gradient, 16:9, container-query units) + .bgfx (soft dot grid) + .wash (slow drifting glow orb).
• Liquid-glass card — .lcard: frosted backdrop-filter glass, a masked gradient border (::before, fed by --edge), and a diagonal shine (::after). Set --accent/--accent2/--edge per scene for the color.
• Zoom-forward / fall-back — toggle .up on the active card (it grows to a forward "hero" size and turns dark + opaque so nothing shows through it) and .dim on the rest; switching .up to the next card makes the current one fall back. The left/top/width/height transition does the zoom.
• Staggered entrance — add .cardsin to the stage/scene to play cardIn (cards rise + fade in one after another).
• Camera zoom — wrap scenes in .world; enterScene(world) nudges scale to ~1.06 then settles to 1.0 (the 1.6s CSS transition is the move).

Minimal usage

<div class="stage"><div class="bgfx"></div><div class="wash"></div>
  <div class="world"><section class="scene">
    <div class="cardstage">
      <div class="lcard" data-k="a"><div class="pad">…card A…</div></div>
      <div class="lcard" data-k="b"><div class="pad">…card B…</div></div>
      <div class="lcard" data-k="c"><div class="pad">…card C…</div></div>
    </div>
  </section></div>
</div>
<script src="glass.js"></script>
<script>
  const stage = document.querySelector('.cardstage');
  placeGrid(stage, 3, 1);                 // lay the cards out in a grid
  enterScene(document.querySelector('.world'));   // camera zoom-in → settle
  revealCards(document.querySelector('.scene'));  // staggered entrance
  // step through them on cue (e.g. from vo-sync timing): raise(stage,'a') → raise(stage,'b') → …
  raise(stage, 'a');
</script>

raise(stage, key) zooms that card forward and dims the rest; call it again with the next key to make the current fall back and the next rise. raise(stage, null) drops everything back to the grid.

Liquid glass variants (v3–v6 tokens)

The default .lcard is one glass material. A real film usually needs three, and they are not restyles of each other — they are different answers to "what is behind this card?". All three ship as custom properties in assets/glass.css; two of them also ship as card variants.

<div class="lcard violet" data-k="a"><div class="pad">…</div></div>
<div class="lcard white"  data-k="b"><div class="pad">…</div></div>

Light glass has no class of its own on purpose — point the main tokens at it in one line:

.scene.pale .lcard{--lg-bg:var(--lgl-bg);--lg-border:var(--lgl-border);
                   --lg-hi:var(--lgl-hi);--lg-shadow:var(--lgl-shadow);--lg-blur:var(--lgl-blur);}

Card-scoped ink (the one that bites)

On a dark ground the frame's ink is light — headings, kickers, captions are all pale. A white card in that frame needs the opposite. So .lcard.white re-declares --ink on the card itself:

.lcard.white{ --ink:#1c1633; --ink-dim:#4c4668; --ink-faint:#7c7794;
              --line:rgba(28,22,51,.12); --line2:rgba(28,22,51,.2); }

Three rules, learned the hard way:

• The declaration must sit on the surface element, not on a wrapper around it. If a ground writes ink tokens on :root per frame (see mark-driven-ground), anything declared higher up is shadowed for the card's whole subtree and the text goes white-on-white for a few frames.
• Re-declare every ink token the card's contents might read — text, dim text, faint text, hairlines, chart fills — not just the main one. One missed token is one invisible label.
• Anything that lifts out of a white surface (a toast, a tooltip, a zoomed copy of the card) is also a white surface: give it the same block, or it inherits the frame's light ink.

Token table

The --*-blur tokens are the only blur in the file. Set them to none at capture time — headless Chromium/Edge software-rasterizes backdrop-filter and the tint + streak + edge carry the look without it (see smooth-render).

Composes with the other skills

• kinetic-typography — put a .lead (headline) beside the .cardstage and mark the scene .choreo dk-left|dk-right so the headline gets pushed aside as the cards arrive.
• vo-sync — drive raise() and enterScene() from timing.json so each card zooms forward exactly when the voiceover names it.
• smooth-render — renders cleanly: the glass/zoom are CSS transitions (scale their durations by 1/RATE) and the camera/raise are state toggles. Drop backdrop-filter at capture time (per-frame expensive, visually negligible over the gradient).

Notes

• Units are cqw/cqh (relative to .stage); keep content inside the stage container.
• The forward card is intentionally opaque so lower cards don't bleed through it; the others sit at ~28% (.dim). Tune .lcard.up size/position (or add [data-type] variants) for taller demo content.