diff --git a/apps/desktop/src/renderer/styles/sidebar.css b/apps/desktop/src/renderer/styles/sidebar.css
index bddd1bfe55..4d8ee81bbb 100644
--- a/apps/desktop/src/renderer/styles/sidebar.css
+++ b/apps/desktop/src/renderer/styles/sidebar.css
@@ -34,7 +34,8 @@
   min-height: 34px;
   margin-left: calc(
     var(--maka-sidebar-topbar-offset-x) + var(--maka-sidebar-topbar-button-size) +
-      var(--maka-sidebar-topbar-button-size) + var(--maka-sidebar-topbar-gap) + 8px
+      var(--maka-sidebar-topbar-button-size) + var(--maka-sidebar-topbar-gap) +
+      var(--maka-sidebar-topbar-gap)
   );
   box-sizing: border-box;
   -webkit-app-region: drag;
@@ -120,12 +121,13 @@
   align-content: start;
   display: grid;
   gap: 1px;
-  padding: var(--space-1) var(--space-1-5);
+  /* #546 PR7: left/right padding aligned with .maka-list-stackContent
+     (var(--space-2)) so nav rows and session rows share the same inset. */
+  padding: var(--space-1) var(--space-2);
 }
 
 .maka-nav-row {
-  width: calc(100% - 12px);
-  margin-inline: var(--space-1-5);
+  width: 100%;
   display: grid;
   grid-template-columns: var(--icon-size) minmax(0, 1fr) auto;
   align-items: center;
@@ -212,17 +214,18 @@
   border-top: 0;
 }
 
-/* Group label — section header for session groups. Weight-based
-   hierarchy (not uppercase/letter-spacing) so Chinese labels read
-   cleanly without artificial tracking. */
+/* Group label — section header for session groups. #546 PR7: unified with
+   project-heading on font-size-ui + muted-foreground + medium so all three
+   group-header variants (plain label / collapsible toggle / project heading)
+   share one visual rhythm, distinguished from session rows by color not size. */
 .maka-list-group-label {
   display: flex;
   align-items: baseline;
   gap: var(--space-0-5);
   padding: 0 var(--space-1-5) var(--space-0-5);
   color: var(--muted-foreground);
-  font-size: var(--font-size-caption);
-  font-weight: var(--font-weight-semibold);
+  font-size: var(--font-size-ui);
+  font-weight: var(--font-weight-medium);
   font-variant-numeric: tabular-nums;
 }
 
@@ -237,7 +240,7 @@
   border: 0;
   border-radius: var(--radius-control);
   background: transparent;
-  color: var(--foreground-secondary);
+  color: var(--muted-foreground);
   font-size: var(--font-size-ui);
   font-weight: var(--font-weight-medium);
   text-align: left;
diff --git a/packages/ui/src/session-sidebar-nav.tsx b/packages/ui/src/session-sidebar-nav.tsx
index 7b43836280..f6799a7904 100644
--- a/packages/ui/src/session-sidebar-nav.tsx
+++ b/packages/ui/src/session-sidebar-nav.tsx
@@ -6,14 +6,14 @@ import { cva } from 'class-variance-authority';
 
 const navRowVariants = cva(
   [
-    'min-h-8 gap-2 rounded-sm border-0 bg-transparent px-1.5 py-0.5',
+    'min-h-[var(--h-control-lg)] gap-2 rounded-sm border-0 bg-transparent px-1.5 py-0.5',
     'text-left text-sm text-[var(--foreground-secondary)]',
     'transition-[background-color,color] duration-[var(--duration-base)] ease-[var(--ease-out-strong)]',
-    'hover:bg-foreground/6 hover:text-foreground',
-    'data-[active=true]:bg-foreground/9 data-[active=true]:font-semibold data-[active=true]:text-foreground data-[active=true]:shadow-none',
+    'hover:bg-[var(--state-hover-bg)] hover:text-foreground',
+    'data-[active=true]:bg-[var(--state-selected-bg)] data-[active=true]:font-semibold data-[active=true]:text-foreground data-[active=true]:shadow-none',
     'data-[active=true]:[&_.maka-nav-icon]:text-foreground',
-    '[&_.maka-nav-count]:bg-foreground/6 [&_.maka-nav-count]:text-[var(--muted-foreground)]',
-    'data-[active=true]:[&_.maka-nav-count]:bg-foreground/8 data-[active=true]:[&_.maka-nav-count]:text-foreground',
+    '[&_.maka-nav-count]:bg-[var(--state-hover-bg)] [&_.maka-nav-count]:text-[var(--muted-foreground)]',
+    'data-[active=true]:[&_.maka-nav-count]:bg-[var(--state-selected-bg)] data-[active=true]:[&_.maka-nav-count]:text-foreground',
     'aria-disabled:cursor-not-allowed aria-disabled:opacity-55 aria-disabled:hover:bg-transparent',
     'data-[disabled=true]:cursor-not-allowed data-[disabled=true]:opacity-55 data-[disabled=true]:hover:bg-transparent',
   ],
@@ -36,7 +36,7 @@ const settingsButtonClass =
   'w-full min-w-0 gap-2 rounded-sm border-0 bg-transparent px-2 py-1.5 ' +
   'text-left text-sm font-medium text-[var(--foreground-secondary)] ' +
   'transition-[background-color,color] duration-[var(--duration-base)] ease-[var(--ease-out-strong)] ' +
-  'hover:bg-foreground/6 hover:text-foreground';
+  'hover:bg-[var(--state-hover-bg)] hover:text-foreground';
 
 const MODULE_NAV_LABEL: Record<ModuleNavId, string> = {
   automations: '定时任务',