diff --git a/accounts.html b/accounts.html
index aa40b73..599c67f 100644
--- a/accounts.html
+++ b/accounts.html
@@ -384,6 +384,15 @@ select:focus { border-color: var(--accent); }
   border: 1px solid rgba(0,200,150,0.15);
   border-radius: 999px;
   padding: 0.15rem 0.5rem;
+  cursor: pointer;
+  position: relative;
+  z-index: 1;
+  transition: background 0.15s, border-color 0.15s;
+}
+
+.card-tag:hover {
+  background: rgba(0,200,150,0.22);
+  border-color: var(--accent);
 }
 
 .card-stats {
@@ -731,6 +740,28 @@ let viewMode = 'grid'; // 'grid' | 'list'
 // ────────────────────────────────
 // FILTER + SORT
 // ────────────────────────────────
+function filterByTag(tag) {
+  const wrap = document.getElementById('filterTags');
+  const existing = wrap.querySelector(`.ftag[data-tag="${CSS.escape(tag)}"]`);
+  if (existing) {
+    wrap.querySelectorAll('.ftag').forEach(b => b.classList.remove('active'));
+    existing.classList.add('active');
+  } else {
+    const btn = document.createElement('button');
+    btn.className = 'ftag active';
+    btn.dataset.tag = tag;
+    btn.textContent = '#' + tag;
+    btn.addEventListener('click', () => {
+      wrap.querySelectorAll('.ftag').forEach(b => b.classList.remove('active'));
+      btn.classList.add('active');
+      applyFilters();
+    });
+    wrap.querySelectorAll('.ftag').forEach(b => b.classList.remove('active'));
+    wrap.appendChild(btn);
+  }
+  applyFilters();
+}
+
 function applyFilters() {
   const q = document.getElementById('searchInput').value.toLowerCase().trim();
   const cat = document.getElementById('categoryFilter').value;
@@ -793,7 +824,7 @@ function avatarFallback(name) {
 function cardHTML(a, idx) {
   const av = a.avatar || avatarFallback(a.name);
   const tags = (a.tags || []).slice(0, 4).map(t =>
-    `<span class="card-tag">#${t}</span>`).join('');
+    `<span class="card-tag" onclick="event.stopPropagation();filterByTag('${t.replace(/'/g, "\\'")}')">#${t}</span>`).join('');
 
   if (viewMode === 'list') {
     return `
diff --git a/start.html b/start.html
index 26a1195..8cbeb45 100644
--- a/start.html
+++ b/start.html
@@ -76,6 +76,16 @@
 
   .tagline strong { color: var(--text); }
 
+  .about-link {
+    color: var(--accent);
+    text-decoration: none;
+    font-size: 0.92rem;
+    opacity: 0.75;
+    transition: opacity 0.15s;
+  }
+
+  .about-link:hover { opacity: 1; text-decoration: underline; }
+
   /* --- CARDS GRID --- */
   .cards {
     display: grid;
@@ -378,7 +388,8 @@
   <h1>🦣 Mamutovo za 3 minuty.</h1>
   <p class="tagline">
     Žádné algoritmy. Žádné reklamy. <strong>Patří komunitě.</strong><br>
-    Tyhle 4 kroky ti zaplní feed a pomůžou udělat první post.
+    Tyhle 4 kroky ti zaplní feed a pomůžou udělat první post.<br>
+    <a href="https://about.mamutovo.cz" target="_blank" class="about-link">Co je Mamutovo.cz?</a>
   </p>
 </div>