Update accent color and add "PREMIUM" badge styles in course TOC

static/css/app.css

@@ -9,7 +9,7 @@
   --muted: #5e88a0;
   --primary: #4e9ed6;
   --primary-contrast: #06121b;
-  --accent: #ffa500;
+  --accent: #a79228;
   --border: #4f6f8f;
   --card: #13293d;
   --elev: rgba(15,31,46,0.6);
@@ -206,6 +206,36 @@
   margin-left: 8px;
   font-size: 12px;
 }
+
+/* Petit badge "PREMIUM" affiché dans la TOC des cours */
+.premium-tag {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 2px 8px;
+  margin-left: 8px;
+  border-radius: 999px;
+  background: var(--accent);
+  color: var(--warning-contrast);
+  font-size: 11px;
+  font-weight: 800;
+  letter-spacing: .3px;
+  line-height: 1.2;
+  vertical-align: middle;
+  text-transform: uppercase;
+  white-space: nowrap;
+}
+
+.courseToc .tocLink.disabled {
+  color: var(--text-muted);
+  background: transparent;
+  border-color: transparent;
+  cursor: not-allowed;
+  opacity: 0.6;
+  pointer-events: none;
+  font-weight: 500;
+}
+
 [data-theme='light'] {
   /* Palette: plus nuancé, moins "blanc" */
   --bg: #eef3f7; /* fond légèrement teinté bleu-gris */
@@ -1872,6 +1902,7 @@ input[type="text"], input[type="email"], input[type="password"], textarea {
 .btn-primary:hover, .button-primary:hover {
     background-color: var(--link-hover);
     border-color: var(--link-hover);
+    color: var(--primary-contrast);
 }
 
 .btn-secondary, .button-secondary {