Color Palette for White Noise & Ambient Sound. Primary: #475569 (on-primary: #FFFFFF). Secondary: #334155 (on-secondary: #FFFFFF). Accent: #4338CA (on-accent: #FFFFFF). Background: #0F172A. Foreground: #FFFFFF. Card: #192134 (card-foreground: #FFFFFF). Muted: #131B2F (muted-foreground: #94A3B8). Border: rgba(255,255,255,0.08). Destructive: #DC2626 (on-destructive: #FFFFFF). Ring: #475569. Notes: Ambient grey + deep indigo on dark.