diff --git a/public/app.js b/public/app.js
index ee2f479..5dc1234 100755
--- a/public/app.js
+++ b/public/app.js
@@ -9,83 +9,118 @@ const els = {
   content: document.getElementById("content")
 };
 
-let indexData = null;
-let state = { section: "posts", sort: "newest", query: "", sidebarOpen: false };
+const staticPages = new Set(["about", "contact", "legal"]);
 
-async function init(){
-  indexData = await (await fetch("index.json")).json();
-  populateSections();
-  wireUI();
-  renderList();
-  handleHash();
-  window.addEventListener("hashchange", handleHash);
+let indexData = null;
+let sidebarOpen = false;
+
+async function init() {
+  try {
+    indexData = await (await fetch("index.json")).json();
+    populateSections();
+    wireUI();
+    renderList();
+    handleHash();
+    window.addEventListener("hashchange", handleHash);
+  } catch (e) {
+    els.viewer.innerHTML = "<h1>Error Loading Index</h1><p>Failed to load site data. Please try refreshing.</p>";
+  }
 }
 
-function populateSections(){
+function populateSections() {
   els.sectionSelect.innerHTML = "";
-  indexData.sections.forEach(s=>{
+  indexData.sections.forEach(s => {
     const opt = document.createElement("option");
-    opt.value = s; opt.textContent = s;
+    opt.value = s;
+    opt.textContent = s;
     els.sectionSelect.appendChild(opt);
   });
 }
 
-function wireUI(){
-  els.menuBtn.addEventListener("click", ()=>{
-    state.sidebarOpen = !state.sidebarOpen;
-    document.body.classList.toggle("sidebar-open", state.sidebarOpen);
+function wireUI() {
+  els.menuBtn.addEventListener("click", () => {
+    sidebarOpen = !sidebarOpen;
+    document.body.classList.toggle("sidebar-open", sidebarOpen);
   });
-  els.sectionSelect.addEventListener("change", ()=>renderList());
-  els.sortSelect.addEventListener("change", ()=>renderList());
-  els.searchBox.addEventListener("input", ()=>renderList());
-  els.content.addEventListener("click", ()=>{
-    if (window.matchMedia("(max-width:1024px)").matches && document.body.classList.contains("sidebar-open")){
+  els.sectionSelect.addEventListener("change", renderList);
+  els.sortSelect.addEventListener("change", renderList);
+  els.searchBox.addEventListener("input", renderList);
+  els.content.addEventListener("click", () => {
+    if (window.matchMedia("(max-width:1024px)").matches && document.body.classList.contains("sidebar-open")) {
       document.body.classList.remove("sidebar-open");
-      state.sidebarOpen = false;
+      sidebarOpen = false;
     }
   });
 }
 
-function renderList(){
+function renderList() {
   const section = els.sectionSelect.value;
   const sort = els.sortSelect.value;
   const query = els.searchBox.value.toLowerCase();
 
-  let posts = indexData.flat.filter(p=>p.path.startsWith(section));
-  if (query) posts = posts.filter(p=>p.title.toLowerCase().includes(query));
-  posts.sort((a,b)=> sort==="newest"? b.mtime-a.mtime : a.mtime-b.mtime);
+  let posts = indexData.flat.filter(p => p.path.split('/')[0] === section);
+  if (query) posts = posts.filter(p => p.title.toLowerCase().includes(query));
+  posts.sort((a, b) => sort === "newest" ? b.mtime - a.mtime : a.mtime - b.mtime);
 
   els.postList.innerHTML = "";
-  for (const p of posts){
+  for (const p of posts) {
     const li = document.createElement("li");
-    li.innerHTML = `<a href="#/${p.path}">${p.title}</a><br><small>${new Date(p.mtime).toISOString().split("T")[0]}</small>`;
+    const pin = p.pinned ? "&#9733; " : "";
+    li.innerHTML = `<a href="#/${p.path}">${pin}${p.title}</a><br><small>${new Date(p.mtime).toISOString().split("T")[0]}</small>`;
     els.postList.appendChild(li);
   }
 }
 
-async function handleHash(){
-  const rel = location.hash.replace(/^#\//,"");
+async function handleHash() {
+  els.viewer.innerHTML = ""; // Clear viewer to avoid stale content
+  const rel = location.hash.replace(/^#\//, "");
   if (!rel) return renderDefault();
-  const file = indexData.flat.find(f=>f.path===rel);
-  if (!file) return;
-  file.ext===".md"? await renderMarkdown(file.path) : renderHTML(file.path);
+
+  if (rel.endsWith('/')) {
+    const section = rel.replace(/\/$/, '');
+    if (staticPages.has(section)) {
+      renderHTML(section + '/index.html');
+    } else if (indexData.sections.includes(section)) {
+      els.sectionSelect.value = section;
+      renderList();
+      const sectionPosts = indexData.flat.filter(p => p.path.split('/')[0] === section);
+      if (sectionPosts.length === 0) {
+        els.viewer.innerHTML = `<h1>${section.charAt(0).toUpperCase() + section.slice(1)}</h1><p>No posts in this section yet.</p>`;
+      } else {
+        const latest = sectionPosts.sort((a, b) => b.mtime - a.mtime)[0];
+        location.hash = '#/' + latest.path; // Triggers hashchange to load
+      }
+    } else {
+      els.viewer.innerHTML = '<h1>404 Not Found</h1>';
+    }
+  } else {
+    const file = indexData.flat.find(f => f.path === rel);
+    if (!file) {
+      els.viewer.innerHTML = '<h1>404 Not Found</h1>';
+      return;
+    }
+    try {
+      file.ext === ".md" ? await renderMarkdown(file.path) : renderHTML(file.path);
+    } catch (e) {
+      els.viewer.innerHTML = '<h1>Error Loading Content</h1><p>Failed to load the file. Please try another.</p>';
+    }
+  }
 }
 
-async function renderMarkdown(rel){
-  const src = await fetch(rel).then(r=>r.text());
+async function renderMarkdown(rel) {
+  const src = await fetch(rel).then(r => { if (!r.ok) throw new Error(); return r.text(); });
   const html = marked.parse(src);
   els.viewer.innerHTML = `<article>${html}</article>`;
 }
 
-function renderHTML(rel){
+function renderHTML(rel) {
   const iframe = document.createElement("iframe");
-  iframe.setAttribute("sandbox","allow-same-origin allow-scripts allow-forms");
+  iframe.setAttribute("sandbox", "allow-same-origin allow-scripts allow-forms");
   iframe.loading = "eager";
   iframe.src = "/" + rel;
-  els.viewer.innerHTML = "";
   els.viewer.appendChild(iframe);
-  iframe.addEventListener("load", ()=>{
-    try{
+  iframe.addEventListener("load", () => {
+    try {
       const d = iframe.contentDocument || iframe.contentWindow.document;
       const s = d.createElement("style");
       s.textContent = `
@@ -93,12 +128,12 @@ function renderHTML(rel){
         main,article,section{max-width:720px;margin:auto;padding:2rem;}
       `;
       d.head.appendChild(s);
-    }catch{}
+    } catch {}
   });
 }
 
-function renderDefault(){
-  const latest = [...indexData.flat].sort((a,b)=>b.mtime-a.mtime)[0];
+function renderDefault() {
+  const latest = [...indexData.flat].sort((a, b) => b.mtime - a.mtime)[0];
   if (latest) location.hash = "#/" + latest.path;
 }