元素周期表光谱变体

Design a distinctive periodic table poster variant where each element tile is colored by fictional emission-spectrum families while preserving clean scientific layout. Use a dark navy background with luminous but disciplined colors: cyan, magenta, amber, lime, and silver-white. Arrange the periodic table accurately with clear periods and groups, including separate lanthanide and actinide rows. Add a crisp title reading "Periodic Table of the Elements" and subtitle "Spectral Classification Variant". Ensure visible labels for representative tiles such as "H 1", "He 2", "C 6", "Fe 26", "Ag 47", and "U 92". Include side legends titled "Alkali", "Transition", "Metalloid", "Noble Gas", and "Actinide". Add small group numbers "1" through "18" and period numbers "1" through "7". The result should feel educational, modern, and highly legible, with precise typography, clean cell alignment, balanced glow effects, and accurate table structure.