perf: Defer fonts.css and variables.css, inline critical CSS

- Add @font-face declarations to critical-bootstrap.css inline
- Add critical CSS variables (colors, fonts) inline
- Defer fonts.css (utilities only, @font-face inline)
- Defer variables.css (critical vars inline)

Now only style.css is render-blocking (~19KB)
All other CSS deferred with media=print + onload

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

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

Assets/css/critical-bootstrap.css

@@ -14,6 +14,60 @@
  * @see Shared/Infrastructure/Services/CriticalBootstrapService.php
  */
 
+/* ==========================================================================
+   CRITICAL FONTS (Poppins - LCP optimization)
+   ========================================================================== */
+@font-face {
+    font-family: 'Poppins Fallback';
+    src: local('Arial'), local('Helvetica Neue'), local('sans-serif');
+    size-adjust: 106%;
+    ascent-override: 105%;
+    descent-override: 35%;
+    line-gap-override: 10%;
+}
+@font-face {
+    font-family: 'Poppins';
+    src: url('/wp-content/themes/roi-theme/Assets/fonts/poppins-v24-latin-regular.woff2') format('woff2');
+    font-weight: 400;
+    font-style: normal;
+    font-display: swap;
+}
+@font-face {
+    font-family: 'Poppins';
+    src: url('/wp-content/themes/roi-theme/Assets/fonts/poppins-v24-latin-600.woff2') format('woff2');
+    font-weight: 600;
+    font-style: normal;
+    font-display: swap;
+}
+@font-face {
+    font-family: 'Poppins';
+    src: url('/wp-content/themes/roi-theme/Assets/fonts/poppins-v24-latin-700.woff2') format('woff2');
+    font-weight: 700;
+    font-style: normal;
+    font-display: swap;
+}
+
+:root {
+    /* Fonts */
+    --font-primary: 'Poppins', 'Poppins Fallback', sans-serif;
+    --bs-body-font-family: 'Poppins', 'Poppins Fallback', sans-serif;
+
+    /* Theme Colors (críticos para above-the-fold) */
+    --color-navy-dark: #0E2337;
+    --color-navy-medium: #1e3a5f;
+    --color-orange-primary: #FF8600;
+    --color-orange-hover: #e67a00;
+    --bs-primary: #0d6efd;
+    --bs-white: #fff;
+    --bs-body-color: #212529;
+    --bs-body-bg: #fff;
+    --bs-link-color: #0d6efd;
+    --bs-link-hover-color: #0a58ca;
+
+    /* Spacing */
+    --bs-gutter-x: 1.5rem;
+}
+
 /* ==========================================================================
    BOX SIZING & RESETS (Bootstrap Reboot crítico)
    ========================================================================== */