Phase 1: Fixed layout (4 pages) - Image LEFT, Content RIGHT - ท่อ-hdpe, ท่อ-ppr-scg, ท่อ-ppr-thai-ppr, ท่อ-upvc Phase 2: Added bg-white/10 p-2 to image containers Phase 3: Added lg:py-24 padding to sections All pages now match armflex.astro reference structure.