The background (#0C1117) is a deep navy-black. Not pure black. Not neutral gray. A blue-tinted darkness that creates the feeling of a control room at night. The surface (#141C24) adds a lighter layer that's still deeply dark. The entire depth system operates in a narrow band of very dark blues.

Inter at weight 800 for headings. Extra-bold. The heaviest weight before black. Combined with tight letter-spacing (-1.8px), the headlines are dense, physical, imposing. They feel like engine blocks. Heavy metal components built for performance. The 1.5 type scale creates dramatic size jumps that make h1s feel like billboard announcements.

Body text at weight 500 is heavier than standard. Most systems use 400 for body. Turbo uses 500. The entire typographic system is shifted one notch heavier. That pervasive weight creates a feeling of substance. Nothing in this interface is thin. Nothing is delicate. The 1.5 line height keeps the heavier body text readable despite the extra weight.

No shadows. On a canvas this dark, shadows would be invisible. Depth comes entirely from the surface color layering. Dark on slightly-less-dark on slightly-less-dark. The scale hover effect with a 0.96 active scale gives physical, mechanical feedback. Fast motion speed matches the product's pitch: speed. Every interaction is immediate. The lack of shadow effects reinforces the terminal-like flatness. This is a tool, not a showroom.