fix: eliminate gradient flash on real mobile devices - #25
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On real phones, momentum scrolling traverses the 250vh hero section in under a second. Two issues combined to produce a full-screen gradient flash: 1. The reveal (autoAlpha 0→1) and whiteout (autoAlpha 1→0) were separate ScrollTrigger tweens each with 0.6s scrub lag. During fast scrolling they caught up at different times, leaving the gradient at full opacity in the gap. Fixed by using scrub: true (zero lag) on mobile so both tweens track scroll position exactly. 2. The WebGL canvas inside SVG foreignObject was promoted to an independent GPU compositing layer on mobile, ignoring parent opacity/visibility. Fixed by replacing the WebGL path with a CSS gradient on mobile, set via GSAP (not JSX) so it appears atomically with autoAlpha: 0. Additionally, CometTrailBackground is now loaded with next/dynamic ssr: false to prevent the WebGL canvas from appearing in server HTML. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Same root cause as the hero gradient flash: mobile GPUs promote WebGL canvases inside SVG foreignObject to independent compositing layers that ignore SVG masks. Replace WebGL with CSS gradient on mobile and use scrub: true for zero-lag scroll tracking. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
scrub: truefor zero-lag scroll tracking. Load CometTrailBackground withnext/dynamicssr: false.scrub: trueinstead of0.6to prevent flash from momentum scrolling.Root cause
Mobile GPUs promote WebGL canvases inside SVG
foreignObjectto independent compositing layers that ignore SVG masks and parent opacity/visibility. Combined with numericscrublag (0.6s), momentum scrolling on real phones causes the gradient to flash full-screen before animations catch up.Test plan
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