сделал main-menu

assets/css/gp-style-core.css

@@ -98,6 +98,7 @@
     /* text */
     --text-white: #fff;
     --text-black: #121212;
+    --text-dark: #2b2b3b;
 
     /* background */
     --background-white: #fff;
@@ -199,7 +200,7 @@ button{
   font-weight: 400;
   font-size: 20px;
   line-height: 120%;
-  color: var(--text-black);
+  color: var(--text-dark);
 
   text-decoration: none;
 
@@ -258,4 +259,68 @@ button{
   width: 24px;
   aspect-ratio: 1;
 }
-/* mini-profile */
+/* mini-profile */
+
+/* main-menu */
+.main-menu{
+  display: flex;
+  align-items: center;
+
+  list-style-type: none;
+}
+.main-menu__item{
+  margin-left: 24px;
+
+  transition: opacity .2s ease-out;
+}
+.main-menu__item:first-child{
+  margin-left: 0;
+}
+.main-menu__item:hover{
+  opacity: .8;
+}
+.main-menu__link{
+  display: block;
+
+  padding: 8px 12px;
+
+  font-family: var(--font-family);
+  font-weight: 700;
+  font-size: 16px;
+  line-height: 125%;
+  color: var(--text-black);
+
+  text-decoration: none;
+}
+.main-menu__button{
+  padding: 8px 32px 8px 12px;
+
+  font-family: var(--font-family);
+  font-weight: 700;
+  font-size: 16px;
+  line-height: 125%;
+  color: var(--text-black);
+
+  border: none;
+  border-radius: 24px;
+
+  background: var(--gradient-turquoise);
+
+  position: relative;
+}
+.main-menu__button::before{
+  content: '';
+
+  position: absolute;
+  top: 14px;
+  right: 14px;
+
+  width: 13px;
+  height: 8px;
+
+  background-image: url(../img/svg/main/arrow-black.svg);
+  background-repeat: no-repeat;
+  background-size: contain;
+}
+
+/* main-menu */

assets/css/gp-style-desktop.css

@@ -28,17 +28,6 @@
 .header__logo-black{
 
 }
-
-.main-menu{
-    display: flex;
-    align-items: center;
-}
-
-
-
-
-
-
 /* header end */