Keynote Black.

Jobs-2007 / Lei-Jun-launch-event keynote decks: pure black #000000 stage, pure white type, one word or one giant tabular-nums numeral per screen, exactly one brand accent (Mi orange #FF6900 / Spotify green #1ED760 / Apple blue #2997FF) per deck, massive negative space, faint center spotlight, accent-vs-grey spec-comparison bars, and a price-reveal climax page on a fixed 1920×1080 canvas. Based on https://github.com/alchaincyf/huashu-design black-big-number-stage (design-styles.md 大胆派「黑底巨型数字剧场」, generated from spec and wrapped in a full multi-section deck shell).