X (Twitter) header banner with text and product hint
X / Twitter 个人主页头图 / LinkedIn cover / YouTube channel banner

The prompt
A horizontal X (Twitter) profile header banner, 3:1 aspect ratio. Composition split into thirds: left third is solid [BG_COLOR_LEFT] with a bold short tagline reading "[TAGLINE]" in 80pt clean sans-serif (similar to Inter Bold), followed by a one-line subtitle "[SUBTITLE]" in 24pt regular weight. Middle third is a stylized illustration or abstract gradient evoking [VISUAL_THEME]. Right third is solid [BG_COLOR_RIGHT] with a small CTA pill button reading "[CTA]" in dark text on light surface. Profile avatar circle area (lower-left) is left empty / safe-zoned. Professional, modern, high contrast for readability on both light and dark X themes. 1500×500 native.
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