UI Reasoning: Short Video Editor. Recommended Pattern: Feature-Rich Showcase + Hero-Centric. Style Priority: Dark Mode (OLED) + Motion-Driven. Color Mood: Dark background + timeline track accent colors + effect preview vivid. Typography Mood: High contrast + Light on dark. Key Effects: Subtle glow + Neon accents + High contrast. Decision Rules: {"if_light_mode_needed": "provide-theme-toggle"}. Anti-Patterns: Pure white backgrounds. Severity: HIGH.