feat: implement CSRF token helper and update fetch headers; adjust layout styles for responsiveness

docs/.vitepress/theme/styles/custom.css

@@ -33,14 +33,14 @@
   --vp-custom-block-danger-border: #fecaca;
   --vp-custom-block-danger-text: #b91c1c;
 
-  /* Layout Width - Wider content area */
-  --vp-layout-max-width: 1600px;
-  --vp-content-width: 920px;
-  --vp-sidebar-width: 280px;
-  --vp-toc-width: 200px;
+  /* Layout Width - Wider content area (using rem for zoom responsiveness) */
+  --vp-layout-max-width: 100rem; /* 1600px / 16 */
+  --vp-content-width: 57.5rem; /* 920px / 16 */
+  --vp-sidebar-width: 17.5rem; /* 280px / 16 */
+  --vp-toc-width: 12.5rem; /* 200px / 16 */
 
   /* Prose width for optimal readability */
-  --vp-prose-width: 820px;
+  --vp-prose-width: 51.25rem; /* 820px / 16 */
 }
 
 .dark {
@@ -575,6 +575,39 @@ div[class*='language-'] .vp-copy:hover {
   padding: var(--vp-spacing-2) var(--vp-spacing-4);
 }
 
+/* Sidebar numbering and indentation */
+/* Initialize counter on the sidebar container */
+.VPSidebar .VPSidebarGroup,
+.VPSidebar nav {
+  counter-reset: sidebar-item;
+}
+
+/* Increment counter for level-1 items only */
+.VPSidebar .VPSidebarItem.level-1 {
+  counter-increment: sidebar-item;
+}
+
+/* Add numbers to sidebar items */
+.VPSidebar .VPSidebarItem.level-1 .link::before {
+  content: counter(sidebar-item) ". ";
+  color: var(--vp-c-text-3);
+  font-weight: 500;
+  margin-right: 8px;
+}
+
+/* Indentation for different levels */
+.VPSidebar .VPSidebarItem.level-1 {
+  padding-left: 16px;
+}
+
+.VPSidebar .VPSidebarItem.level-2 {
+  padding-left: 32px;
+}
+
+.VPSidebar .VPSidebarItem.level-3 {
+  padding-left: 48px;
+}
+
 /* ============================================
  * Navigation Polish
  * ============================================ */
@@ -662,15 +695,20 @@ div[class*='language-'] .vp-copy:hover {
   background: var(--vp-c-bg-soft);
 }
 
-.VPDocOutline .outline-link.is-active {
-  color: var(--vp-c-primary);
-  font-weight: 500;
-  background: var(--vp-c-bg-soft);
+/* Match VitePress actual DOM structure: <li><a class="outline-link active">...</a></li> */
+/* Override VitePress scoped styles with higher specificity */
+.VPDocAside .VPDocAsideOutline .outline-link.active {
+  color: var(--vp-c-brand) !important;
+  font-weight: 600 !important;
+  background: var(--vp-c-bg-soft) !important;
+  padding: 4px 8px !important;
+  border-radius: 4px !important;
+  transition: all 0.25s !important;
 }
 
 .VPDocOutline .outline-marker {
-  width: 2px;
-  background: var(--vp-c-primary);
+  width: 3px;
+  background: var(--vp-c-brand);
   border-radius: var(--vp-radius-full);
 }
 

docs/.vitepress/theme/styles/mobile.css

@@ -658,11 +658,11 @@
  * ============================================ */
 @media (min-width: 1024px) {
   :root {
-    --vp-layout-max-width: 1440px;
-    --vp-content-width: 860px;
-    --vp-sidebar-width: 280px;
-    --vp-prose-width: 720px;
-    --vp-toc-width: 220px;
+    --vp-layout-max-width: 90rem; /* 1440px / 16 */
+    --vp-content-width: 53.75rem; /* 860px / 16 */
+    --vp-sidebar-width: 17.5rem; /* 280px / 16 */
+    --vp-prose-width: 45rem; /* 720px / 16 */
+    --vp-toc-width: 13.75rem; /* 220px / 16 */
   }
 
   .VPContent {
@@ -691,14 +691,14 @@
 
   /* Ensure content has proper margin-left to clear the sidebar */
   .VPContent.has-sidebar {
-    margin-left: var(--vp-sidebar-width, 280px) !important;
-    margin-right: calc(var(--vp-toc-width, 220px) + 48px) !important;
+    margin-left: var(--vp-sidebar-width) !important;
+    margin-right: calc(var(--vp-toc-width) + 3rem) !important; /* 48px = 3rem */
     padding: var(--vp-spacing-8) var(--vp-spacing-12) !important;
   }
 
-  /* Adjust doc container - remove auto margin to prevent offset */
+  /* Adjust doc container - allow content to scale with zoom */
   .VPDoc.has-aside .content-container {
-    max-width: 100%;
+    width: 100%;
     padding: 0 var(--vp-spacing-10);
   }
 
@@ -781,14 +781,14 @@
  * ============================================ */
 @media (min-width: 1440px) {
   :root {
-    --vp-content-width: 920px;
-    --vp-sidebar-width: 300px;
-    --vp-prose-width: 760px;
-    --vp-toc-width: 260px;
+    --vp-content-width: 57.5rem; /* 920px / 16 */
+    --vp-sidebar-width: 18.75rem; /* 300px / 16 */
+    --vp-prose-width: 47.5rem; /* 760px / 16 */
+    --vp-toc-width: 16.25rem; /* 260px / 16 */
   }
 
   .VPDoc.has-aside .content-container {
-    max-width: 100%;
+    width: 100%;
     padding: 0 var(--vp-spacing-12);
     margin-left: 0;
     margin-right: 0;