Book cover for "税收学原理讲义",

Book cover for "税收学原理讲义", Chinese tax theory textbook.Design: Minimal and understated. Light gray/off-white textured background with subtle paper grain. Four thin horizontal stripes at bottom in muted blue, muted green, muted gold, muted purple. Black Chinese title in clean serif font, centered. No icons, no shadows, no decorative elements. Pure and simple academic book cover style. 2:3 vertical ratio.