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PROMPT (exact, as issued):
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Build a standalone, self-contained HTML page: a flower blooming — the
stem grows, buds form, and petals unfurl in stages. Palette: spring
pastels (soft pink, rose, leaf green). Signature: SVG/CSS stem growth,
petals rotating and scaling open in layered stages, gentle sway, soft
ambient particles.
Constraints: one self-contained .html, ALL CSS in one <style> and ALL JS
in one <script> (inline everything), ZERO external dependencies (no
CDN, no external fonts — system stacks only, no external images/SVG
files/libraries), works fully offline by double-clicking with no network
requests, responsive 320px->4K, valid HTML5, Awwwards-caliber original
art direction.

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TITLE:
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UNFURL · Slowly, It Blooms

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DESIGN DESCRIPTION:
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Against a soft spring-pastel glow, a single flower performs its whole
life in miniature: the stem rises from the ground, leaves unfold along
its length, a tight bud swells, and finally the petals open in layered
stages — outer, middle, inner — each rotating and scaling wide before a
golden centre settles into place. Once open, the bloom breathes with a
gentle sway while pollen drifts through the warm light.

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MAJOR VISUAL TECHNIQUES:
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- SVG stem drawn with a stroke-dasharray/dashoffset "growing" animation
  that traces the stem upward, plus a soft highlight stroke.
- Leaves and bud that scale+rotate in from nothing with staggered CSS
  keyframes timed to the stem's growth.
- Petals built as five radial ellipses per layer across three nested
  layers, each layer blooming (scale + rotate open) later than the last
  for a true staged unfurl.
- Radial gradients on petals and centre for soft, painterly depth.
- A continuous gentle sway on the whole plant, then a slow "breathing"
  scale once fully open.
- Canvas pollen motes with additive blending drifting upward for ambient
  warmth.

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INTENDED INTERACTION MODEL:
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A one-time cinematic growth sequence that plays from stem to full bloom
on load and then settles into a slow ambient sway — best experienced by
watching it unfold. There are no buttons; the narrative is the timing.
The whole sequence re-runs on reload, so the "plant" can bloom again.