refactor: update styles in MembersDirectory and NewsletterArchive for consistency and improved theming

- Updated color classes to use CSS variables for better maintainability and theming.
- Refactored component styles in MembersDirectory.js to enhance visual consistency.
- Adjusted loading states and empty states in NewsletterArchive.js for improved user experience.
- Added new brand colors to tailwind.config.js for future use.

src/components/registration/RegistrationStepIndicator.js

@@ -20,17 +20,17 @@ const RegistrationStepIndicator = ({ currentStep, totalSteps = 4 }) => {
                 w-12 h-12 rounded-full flex items-center justify-center font-semibold text-lg
                 transition-all duration-300
                 ${currentStep === step.number
-                  ? 'bg-[#ff9e77] text-white scale-110 shadow-lg'
+                  ? 'bg-var(--orange-light) text-white scale-110 shadow-lg'
                   : currentStep > step.number
-                    ? 'bg-[#81B29A] text-white'
-                    : 'bg-[#ddd8eb] text-[#664fa3]'
+                    ? 'bg-var(--green-light) text-white'
+                    : 'bg-var(--neutral-800) text-var(--purple-lavender)'
                 }
               `}>
                 {currentStep > step.number ? '✓' : step.number}
               </div>
               <span className={`
                 text-sm mt-2 font-medium transition-colors
-                ${currentStep === step.number ? 'text-[#ff9e77]' : 'text-[#664fa3]'}
+                ${currentStep === step.number ? 'text-var(--orange-light)' : 'text-var(--purple-lavender)'}
               `} style={{ fontFamily: "'Nunito Sans', sans-serif" }}>
                 {step.title}
               </span>
@@ -38,11 +38,11 @@ const RegistrationStepIndicator = ({ currentStep, totalSteps = 4 }) => {
 
             {/* Connecting Line */}
             {index < steps.length - 1 && (
-              <div className="flex-1 h-1 mx-2 relative -top-6 bg-[#ddd8eb]">
+              <div className="flex-1 h-1 mx-2 relative -top-6 bg-var(--neutral-800)">
                 <div
                   className={`
                     h-full transition-all duration-500
-                    ${currentStep > step.number ? 'bg-[#81B29A] w-full' : 'bg-transparent w-0'}
+                    ${currentStep > step.number ? 'bg-var(--green-light) w-full' : 'bg-transparent w-0'}
                   `}
                 />
               </div>
@@ -52,8 +52,8 @@ const RegistrationStepIndicator = ({ currentStep, totalSteps = 4 }) => {
       </div>
 
       {/* Step Counter */}
-      <p className="text-center text-[#664fa3] mt-6 text-lg" style={{ fontFamily: "'Nunito Sans', sans-serif" }}>
-        Step <span className="font-semibold text-[#ff9e77]">{currentStep}</span> of {totalSteps}
+      <p className="text-center text-var(--purple-lavender) mt-6 text-lg" style={{ fontFamily: "'Nunito Sans', sans-serif" }}>
+        Step <span className="font-semibold text-var(--orange-light)">{currentStep}</span> of {totalSteps}
       </p>
     </div>
   );