Material Design vs Flat Design质感设计（Material Design） 对比 扁平设计

This is Material Design because…这是 Material Design，因为……

This is Material Design because depth is restored as a physics system — every surface sits at a measured z-axis elevation casting a shadow that encodes its height, and motion expresses where elements come from.

这是质感设计，因为纵深被恢复成了一套物理系统 —— 每个表面在 z 轴上都有一个可测量的 elevation，投下编码其高度的阴影，动效则表达元素从哪里来。

It would become Flat Design if…如果……就变成 Flat Design 了

It would become Flat Design if the z-axis were collapsed back to zero — shadows deleted, the FAB flattened into a solid color block, hierarchy left to color and type alone.

如果把 z 轴重新压回零 —— 删掉阴影、FAB 拍扁成色块、层级全交给颜色和字体 —— 就变成扁平设计了。