Remove study sidebar and add account/login CTA button

src/App.css

@@ -1178,29 +1178,6 @@
   padding: 1rem 0 0;
 }
 
-.study-tracks-with-sidebar {
-  display: grid;
-  grid-template-columns: 1fr 380px;
-  gap: 4rem;
-  align-items: start;
-  width: 100%;
-}
-
-.study-tracks-main {
-  min-width: 0;
-}
-
-.study-signup-sidebar {
-  position: sticky;
-  top: 5.75rem;
-  background: rgba(20, 20, 18, 0.92);
-  border: 1px solid rgba(201, 168, 76, 0.2);
-  border-radius: 16px;
-  padding: 1.5rem;
-  height: fit-content;
-  margin-left: auto;
-}
-
 #study-tracks {
   width: 100%;
   display: block;
@@ -1212,48 +1189,11 @@
   display: block;
   margin-top: 3rem;
   padding-top: 3rem;
+  padding-right: 0;
   border-top: 1px solid rgba(201, 168, 76, 0.15);
   background: linear-gradient(180deg, rgba(0,0,0,0), rgba(201, 168, 76, 0.03));
 }
 
-.study-signup-sidebar-header {
-  margin-bottom: 1rem;
-}
-
-.study-signup-sidebar-label {
-  margin: 0 0 0.3rem;
-  color: var(--brand-gold);
-  text-transform: uppercase;
-  letter-spacing: 0.12em;
-  font-size: 0.72rem;
-  font-weight: 600;
-}
-
-.study-signup-sidebar-header h3 {
-  margin: 0;
-  font-family: var(--brand-font-heading);
-  font-size: 1.35rem;
-  color: var(--brand-warm-white);
-}
-
-.study-signup-sidebar-cards {
-  display: flex;
-  flex-direction: column;
-  gap: 0.8rem;
-}
-
-.study-signup-sidebar .study-signup-why-card {
-  padding: 1rem;
-  margin: 0;
-}
-
-.study-signup-sidebar .study-signup-why-card h4 {
-  margin: 0.35rem 0 0.25rem;
-  font-family: var(--brand-font-heading);
-  font-size: 0.95rem;
-  color: var(--brand-warm-white);
-}
-
 .study-module-header {
   margin-bottom: 0.85rem;
 }
@@ -1586,20 +1526,6 @@
     padding: 0.75rem 1.8rem;
   }
 
-  .study-course-hero-actions .btn-start-here {
-    flex-basis: 100%;
-  }
-
-  .study-tracks-with-sidebar {
-    grid-template-columns: 1fr;
-    gap: 1.5rem;
-  }
-
-  .study-signup-sidebar {
-    position: static;
-    top: auto;
-  }
-
   .study-hub-flow-grid {
     grid-template-columns: 1fr;
   }