add correct name and improve navbar

src/app/app.css

@@ -25,6 +25,13 @@
   z-index: 20;
 }
 
+.sidebar-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.75rem;
+}
+
 .brand {
   color: #e6edf3;
   font-size: 1.05rem;
@@ -63,6 +70,35 @@
   outline: none;
 }
 
+.burger {
+  display: none;
+  width: 2.25rem;
+  height: 2.25rem;
+  border: 1px solid #30363d;
+  border-radius: 10px;
+  background: rgba(13, 17, 23, 0.65);
+  cursor: pointer;
+  padding: 0.25rem;
+}
+
+.burger span {
+  display: block;
+  width: 1.2rem;
+  height: 2px;
+  margin: 0.24rem auto;
+  background: #e6edf3;
+}
+
+.site-footer {
+  margin-top: 2rem;
+  text-align: center;
+  color: #8b949e;
+}
+
+.site-footer p {
+  margin: 0;
+}
+
 @media (max-width: 1320px) {
   .content {
     max-width: 1040px;
@@ -79,3 +115,38 @@
     flex-wrap: wrap;
   }
 }
+
+@media (max-width: 768px) {
+  .content {
+    padding-top: calc(6.5rem + env(safe-area-inset-top));
+  }
+
+  .sidebar {
+    position: fixed;
+    top: 0.75rem;
+    right: 0.75rem;
+    left: 0.75rem;
+    width: auto;
+    margin: 0;
+    gap: 0.6rem;
+    border-radius: 16px;
+  }
+
+  .subtitle {
+    display: none;
+  }
+
+  .burger {
+    display: inline-block;
+  }
+
+  .nav {
+    display: none;
+    flex-direction: column;
+    gap: 0.4rem;
+  }
+
+  .nav.nav-open {
+    display: flex;
+  }
+}