中控顶栏上方增加留白，导航字号加大。

Co-authored-by: Cursor <cursoragent@cursor.com>

static/hub.css

@@ -54,9 +54,9 @@ a:hover { color: #7dd3fc; }
   flex-direction: column;
   align-items: center;
   justify-content: center;
-  gap: 10px;
-  min-height: 96px;
-  padding: 18px 88px 16px;
+  gap: 14px;
+  min-height: 118px;
+  padding: 36px 88px 20px;
   border-bottom: 1px solid var(--line);
   background: rgba(8, 14, 26, 0.75);
   backdrop-filter: blur(12px);
@@ -77,13 +77,14 @@ a:hover { color: #7dd3fc; }
   display: flex;
   justify-content: center;
   flex-wrap: wrap;
-  gap: 4px 22px;
+  gap: 6px 28px;
 }
 .topbar-nav a {
   color: var(--muted);
-  font-weight: 500;
-  letter-spacing: 0.06em;
-  padding: 2px 0;
+  font-size: 1.08rem;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  padding: 4px 0;
 }
 .topbar-nav a.active {
   color: var(--accent);
@@ -91,7 +92,7 @@ a:hover { color: #7dd3fc; }
 }
 .topbar-logout {
   position: absolute;
-  top: 16px;
+  top: 22px;
   right: 22px;
   color: var(--muted);
   font-size: 0.82rem;
@@ -103,8 +104,11 @@ a:hover { color: #7dd3fc; }
 @media (max-width: 720px) {
   .topbar {
     min-height: 0;
-    padding: 14px 16px 12px;
-    gap: 8px;
+    padding: 24px 16px 14px;
+    gap: 10px;
+  }
+  .topbar-nav a {
+    font-size: 0.98rem;
   }
   .topbar-brand {
     letter-spacing: 0.22em;