Add RGB CSS variables for theme colors

Introduce --primary-rgb, --accent-rgb, --success-rgb and --warning-rgb and replace hardcoded rgba(...) usages in CSS with rgba(var(--*-rgb), alpha) to allow dynamic alpha blending from theme colors. Add a hexToRgb helper in setup.js and populate these RGB variables in applyThemeToSetupPage (handles 3- and 6-digit hex and validates input), so runtime theme changes can drive translucent shadows, backgrounds and highlights.

renderer/setup.css

@@ -12,14 +12,18 @@
   --dark-blue: #0B1C2B;
   --dark-purple: #1B1035;
   --primary: #7B2EFF;
+  --primary-rgb: 123, 46, 255;
   --accent: #00C6FF;
+  --accent-rgb: 0, 198, 255;
   --text: #E0E0E0;
   --text-secondary: #A0A0A0;
   --card-bg: rgba(255, 255, 255, 0.05);
   --card-hover: rgba(255, 255, 255, 0.08);
   --border: rgba(255, 255, 255, 0.1);
   --success: #4CAF50;
+  --success-rgb: 76, 175, 80;
   --warning: #FF9800;
+  --warning-rgb: 255, 152, 0;
   --gradient-primary: linear-gradient(135deg, var(--accent), var(--primary));
   --gradient-bg: linear-gradient(145deg, var(--bg) 0%, var(--dark-purple) 100%);
   --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
@@ -98,7 +102,7 @@ body, html {
 .progress-step.active .step-circle {
   background: var(--primary);
   border-color: transparent;
-  box-shadow: 0 4px 12px rgba(123, 46, 255, 0.4);
+  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.4);
   transform: scale(1.1);
 }
 
@@ -190,7 +194,7 @@ body, html {
 .setup-logo {
   width: 120px;
   height: 120px;
-  filter: drop-shadow(0 8px 24px rgba(123, 46, 255, 0.3));
+  filter: drop-shadow(0 8px 24px rgba(var(--primary-rgb), 0.3));
   animation: float 3s ease-in-out infinite;
 }
 
@@ -273,7 +277,7 @@ body, html {
 .theme-card.selected {
   border-color: var(--primary);
   background: var(--card-hover);
-  box-shadow: 0 0 0 3px rgba(123, 46, 255, 0.2);
+  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.2);
 }
 
 .theme-card.selected::after {
@@ -383,7 +387,7 @@ body, html {
 
 .default-browser-status.is-default {
   border-color: var(--success);
-  background: rgba(76, 175, 80, 0.1);
+  background: rgba(var(--success-rgb), 0.1);
 }
 
 .default-browser-status.is-default .status-icon {
@@ -396,7 +400,7 @@ body, html {
 
 .default-browser-status.not-default {
   border-color: var(--warning);
-  background: rgba(255, 152, 0, 0.1);
+  background: rgba(var(--warning-rgb), 0.1);
 }
 
 @keyframes spin {
@@ -430,7 +434,7 @@ body, html {
   justify-content: center;
   font-size: 4rem;
   font-weight: bold;
-  box-shadow: 0 8px 32px rgba(123, 46, 255, 0.4);
+  box-shadow: 0 8px 32px rgba(var(--primary-rgb), 0.4);
   animation: scaleIn 0.5s ease;
 }
 
@@ -492,7 +496,7 @@ body, html {
 
 /* Future Feature Teaser */
 .future-feature-teaser {
-  background: linear-gradient(135deg, rgba(123, 46, 255, 0.1), rgba(0, 198, 255, 0.1));
+  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--accent-rgb), 0.1));
   border: 1px solid var(--border);
   border-radius: 16px;
   padding: 2rem;
@@ -554,12 +558,12 @@ body, html {
 .btn-primary {
   background: var(--primary);
   color: white;
-  box-shadow: 0 4px 12px rgba(123, 46, 255, 0.3);
+  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
 }
 
 .btn-primary:hover {
   transform: translateY(-2px);
-  box-shadow: 0 6px 20px rgba(123, 46, 255, 0.4);
+  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
 }
 
 .btn-primary:active {

renderer/setup.js

@@ -121,6 +121,22 @@ function getThemeById(themeId) {
   return null;
 }
 
+function hexToRgb(hex) {
+  if (!hex || typeof hex !== 'string') return null;
+  let normalized = hex.trim().replace(/^#/, '');
+  if (normalized.length === 3) {
+    normalized = normalized.split('').map(char => char + char).join('');
+  }
+  if (!/^[a-fA-F\d]{6}$/.test(normalized)) return null;
+
+  const intValue = parseInt(normalized, 16);
+  return {
+    r: (intValue >> 16) & 255,
+    g: (intValue >> 8) & 255,
+    b: intValue & 255
+  };
+}
+
 /**
  * Apply theme to the setup page UI and persist selection
  */
@@ -140,6 +156,25 @@ function applyThemeToSetupPage(theme, themeId = null) {
   setVar('--primary', colors.primary, '#7B2EFF');
   setVar('--accent', colors.accent, '#00C6FF');
   setVar('--text', colors.text, '#E0E0E0');
+  setVar('--success', colors.accent, '#4CAF50');
+  setVar('--warning', colors.primary, '#FF9800');
+
+  const primaryRgb = hexToRgb(colors.primary || '#7B2EFF');
+  const accentRgb = hexToRgb(colors.accent || '#00C6FF');
+  const successRgb = hexToRgb(colors.accent || '#4CAF50');
+  const warningRgb = hexToRgb(colors.primary || '#FF9800');
+  if (primaryRgb) {
+    setVar('--primary-rgb', `${primaryRgb.r}, ${primaryRgb.g}, ${primaryRgb.b}`);
+  }
+  if (accentRgb) {
+    setVar('--accent-rgb', `${accentRgb.r}, ${accentRgb.g}, ${accentRgb.b}`);
+  }
+  if (successRgb) {
+    setVar('--success-rgb', `${successRgb.r}, ${successRgb.g}, ${successRgb.b}`);
+  }
+  if (warningRgb) {
+    setVar('--warning-rgb', `${warningRgb.r}, ${warningRgb.g}, ${warningRgb.b}`);
+  }
 
   if (theme.gradient) {
     document.body.style.background = theme.gradient;