style(auth): alinear botones de Google y Facebook horizontalmente en tablet y desktop

public/css/style.css

@@ -786,21 +786,31 @@ body {
 }
 
 .btn-social-fb {
-    border: 1px solid #cbd5e1;
+    border: 1px solid #dadce0;
     background: #ffffff;
-    color: #1877f2;
-    font-weight: 600;
-    font-size: 0.9rem;
-    border-radius: 12px;
-    padding: 0.65rem 1rem;
-    transition: all 0.2s ease;
+    color: #3c4043;
+    font-weight: 500;
+    font-size: 0.82rem;
+    border-radius: 4px;
+    height: 40px;
+    padding: 0 0.85rem;
+    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
     text-decoration: none;
+    width: 100%;
+    max-width: 250px;
+    white-space: nowrap;
+    box-shadow: 0 1px 2px rgba(60, 64, 67, 0.08);
 }
 
 .btn-social-fb:hover {
-    background: #f0f6ff;
+    background: #f8fafd;
     border-color: #1877f2;
-    color: #0c56be;
+    color: #1877f2;
+    box-shadow: 0 1px 3px rgba(60, 64, 67, 0.15);
+}
+
+.btn-social-fb i {
+    color: #1877f2;
 }
 
 .staff-badge-pill {
@@ -831,19 +841,63 @@ body {
 
 .social-auth-wrapper {
     width: 100%;
+    margin-top: 0.25rem;
+}
+
+.social-buttons-grid {
     display: flex;
     flex-direction: column;
+    gap: 0.65rem;
+    width: 100%;
     align-items: center;
 }
 
-.social-auth-wrapper .g_id_signin {
-    max-width: 100%;
+.social-btn-box {
+    width: 100%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 40px;
 }
 
-.social-auth-wrapper .g_id_signin iframe {
+.social-google-box .g_id_signin {
+    max-width: 100%;
+    display: flex;
+    justify-content: center;
+}
+
+.social-google-box .g_id_signin iframe {
     max-width: 100% !important;
 }
 
+/* Tablet y Desktop: botones alineados horizontalmente (min-width: 576px) */
+@media (min-width: 576px) {
+    .social-buttons-grid {
+        flex-direction: row;
+        align-items: center;
+        justify-content: center;
+        gap: 0.75rem;
+    }
+
+    .social-btn-box {
+        flex: 1 1 50%;
+        width: auto;
+    }
+
+    .social-google-box {
+        justify-content: center;
+    }
+
+    .social-fb-box {
+        justify-content: center;
+    }
+
+    .btn-social-fb {
+        width: 100%;
+        max-width: 240px;
+    }
+}
+
 /* ==============================================================================
    Mobile & Responsive Optimization for Login & App
    ============================================================================== */
@@ -977,8 +1031,9 @@ body {
     }
 
     .btn-social-fb {
-        padding: 0.6rem 0.75rem;
-        font-size: 0.84rem;
+        height: 40px;
+        font-size: 0.82rem;
+        max-width: 250px;
     }
 
     .login-divider {