Dark Mode UI is the mainstream dark-theme interface language codified by Google's Material Design. Its baseline is a near-black charcoal of #121212 — deliberately not pure black — chosen to reduce eye strain and let elevation read. Depth is communicated not by drop shadows but by compositing semi-transparent white overlays over the ground: the higher an element rises, the lighter its surface becomes.

Accents are desaturated — a soft lavender, a muted teal, a dusty error rose — reserved for interactive emphasis. Body text rides on white at reduced opacity (87% / 60% / 38%), never full strength, so the interface stays calm, legible, and easy on OLED screens at night.