[NIVEL 2 AVANCE] Issues #49-#53 - Componentes Principales Verificados

Todos los componentes del NIVEL 2 ya están implementados correctamente:
- ✅ Notification Bar (#49)
- ✅ Navbar (#50)
- ✅ Hero Section (#51)
- ✅ Sidebar (#52)
- ✅ Footer (#53)

Solo se actualizó notification-bar.css para usar variables CSS.

Próximo paso: NIVEL 3 (Refinamientos visuales)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

_planeacion/theme_referencias/urls.txt

@@ -0,0 +1,25 @@
+Title wp
+
+https://www.ibeam.ai/lp/estimating-software
+
+toc and imagen destacada
+
+https://gsdconstructions.com/blog/construction-cost-estimating/
+
+footer
+
+https://www.rsmeans.com/products/books/2025-cost-data-books
+
+Contact form, demo try
+https://buildbook.co/glossary/unit-price-contracts
+
+###################################################
+
+Cta (debano de TOC, toc con scrollbar vertical de ser necesario) y formulario de contacto
+https://rdash.io/blog/unit-price-contracts-in-construction/
+
+cta en post de blog/construction-cost-estimating/
+https://rdash.io/blog/construction-management-vs-project-management/
+
+cta en nav bar
+https://rdash.io/blog/construction-management-vs-project-management/