diff --git a/site/templates/base.html b/site/templates/base.html
index b2734a8..ab9a156 100755
--- a/site/templates/base.html
+++ b/site/templates/base.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="pl">
   <head>
     <title>wyślij.co {% block subtitle %}{% endblock %}</title>
     <meta charset="utf-8" />
@@ -33,7 +33,6 @@
     <script src="/scripts.js" type="text/javascript"></script>
 
     <link href="../output.css" rel="stylesheet" />
-    <title></title>
   </head>
   <body class="bg-white lg:bg-background">
     {% include "svg_definitions.html" %}
@@ -43,7 +42,7 @@
         <div class="w-11/12 lg:w-11/12 xl:w-8/12 2xl:w-6/12 flex justify-between items-center">
         <div class="flex items-center">
           <a href="{{ url_for('index') }}">
-            <svg class="h-8" viewBox="0 0 765.89 155.28" xmlns="http://www.w3.org/2000/svg" style="stroke: none; border: none; outline: none; box-shadow: none;">
+            <svg class="h-8" viewBox="0 0 765.89 155.28" xmlns="http://www.w3.org/2000/svg" style="stroke: none; border: none; outline: none; box-shadow: none;" aria-label="Logo wyślij.co - powrót do strony głównej" role="img">
               <use href="#logo-wyslij"></use>
             </svg>
           </a>
diff --git a/site/templates/index.html b/site/templates/index.html
index e2b1e88..066b20c 100755
--- a/site/templates/index.html
+++ b/site/templates/index.html
@@ -1,14 +1,14 @@
 {% extends "base.html" %}
 
 {% block content %}
-<div class="min-h-screen overflow-x-hidden">
+<main class="min-h-screen overflow-x-hidden">
   <div class="flex items-center justify-center px-6 md:px-8 py-8">
     <div class="text-center max-w-4xl w-full">
       <!-- Hero Text -->
       <div class="text-3xl sm:text-5xl md:text-6xl lg:text-7xl font-light mt-6 mb-16 text-center leading-tight text-hero">
-        <div class="text-sectionTitle font-medium">
+        <h1 class="text-sectionTitle font-medium">
           WYŚLIJ.CO<span class="text-gray-500">/FUNDACJI</span>
-        </div>
+        </h1>
       </div>
 
       <!-- Process Steps -->
@@ -16,7 +16,7 @@
         <div class="process-step flex items-start text-left max-w-xs md:max-w-sm lg:max-w-md mx-auto">
           <div class="step-number">1</div>
           <div class="step-content">
-            <h3 class="step-title">Wybierz produkt z listy</h3>
+            <h2 class="step-title">Wybierz produkt z listy</h2>
             <p class="step-description">na stronie wybranej przez Ciebie organizacji</p>
           </div>
         </div>
@@ -24,7 +24,7 @@ <h3 class="step-title">Wybierz produkt z listy</h3>
         <div class="process-step flex items-start text-left max-w-xs md:max-w-sm lg:max-w-md mx-auto">
           <div class="step-number">2</div>
           <div class="step-content">
-            <h3 class="step-title">Zakup produkt online</h3>
+            <h2 class="step-title">Zakup produkt online</h2>
             <p class="step-description">w podlinkowanym sklepie internetowym</p>
           </div>
         </div>
@@ -32,7 +32,7 @@ <h3 class="step-title">Zakup produkt online</h3>
         <div class="process-step flex items-start text-left max-w-xs md:max-w-sm lg:max-w-md mx-auto">
           <div class="step-number">3</div>
           <div class="step-content">
-            <h3 class="step-title">Wyślij prosto do organizacji</h3>
+            <h2 class="step-title">Wyślij prosto do organizacji</h2>
             <p class="step-description">na wskazany adres dostawy</p>
           </div>
         </div>
@@ -44,7 +44,7 @@ <h3 class="step-title">Wyślij prosto do organizacji</h3>
 
       <!-- Organization Links -->
       <div class="organization-links text-center mb-12">
-        <div class="text-xl md:text-2xl lg:text-3xl font-light" id="org-links-container">
+        <div class="text-xl md:text-2xl lg:text-3xl font-light" id="org-links-container" aria-live="polite">
           <div class="flex justify-center items-start gap-4">
             <!-- Left side - WYŚLIJ.CO -->
             <div class="text-sectionTitle font-medium" style="min-width: 120px; text-align: right;">
@@ -55,19 +55,19 @@ <h3 class="step-title">Wyślij prosto do organizacji</h3>
             <div class="text-gray-700 text-left" style="min-width: 250px;">
               <div class="org-link-line">
                 <span class="text-gray-600">/ </span>
-                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="0"></a>
+                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="0" aria-label="Link do organizacji"></a>
               </div>
               <div class="org-link-line">
                 <span class="text-gray-600">/ </span>
-                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="1"></a>
+                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="1" aria-label="Link do organizacji"></a>
               </div>
               <div class="org-link-line">
                 <span class="text-gray-600">/ </span>
-                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="2"></a>
+                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="2" aria-label="Link do organizacji"></a>
               </div>
               <div class="org-link-line">
                 <span class="text-gray-600">/ </span>
-                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="3"></a>
+                <a href="#" class="org-link hover:text-sectionTitle transition-colors" data-org-index="3" aria-label="Link do organizacji"></a>
               </div>
             </div>
           </div>
@@ -78,7 +78,7 @@ <h3 class="step-title">Wyślij prosto do organizacji</h3>
         <a href="/organizacje/" class="zobacz-wiecej text-sectionTitle font-medium text-lg hover:underline">ZOBACZ WIĘCEJ</a>
       </div>
     </div>
-  </div>
+  </main>
 </div>
 
 <script>
diff --git a/site/templates/info.html b/site/templates/info.html
index ac4b35a..6b18d6d 100644
--- a/site/templates/info.html
+++ b/site/templates/info.html
@@ -1,7 +1,7 @@
 {% extends "base.html" %}
 
 {% block content %}
-<div class="min-h-screen">
+<main class="min-h-screen">
   <div class="info-container">
 
     <!-- Section 1: Jak zacząć pomagać? -->
@@ -58,14 +58,14 @@ <h2 class="info-card-title">Pomóż w rozwoju projektu</h2>
     </section>
 
     <section class="info-section">
-      <h1 class="info-section-title">JAK DZIAŁA WYŚLIJ.CO?</h1>
+      <h2 class="info-section-title">JAK DZIAŁA WYŚLIJ.CO?</h2>
       
       <div class="info-grid-3">
         <div>
           <div class="info-step-header">
             <div class="info-step-number">1</div>
             <div>
-              <h3 class="info-step-title">Oni rejestrują się u nas</h3>
+              <h4 class="info-step-title">Oni rejestrują się u nas</h4>
             </div>
           </div>
           <div class="info-step-content">
@@ -83,7 +83,7 @@ <h3 class="info-step-title">Oni rejestrują się u nas</h3>
           <div class="info-step-header">
             <div class="info-step-number">2</div>
             <div>
-              <h3 class="info-step-title">My weryfikujemy</h3>
+              <h4 class="info-step-title">My weryfikujemy</h4>
             </div>
           </div>
           <div class="info-step-content">
@@ -101,7 +101,7 @@ <h3 class="info-step-title">My weryfikujemy</h3>
           <div class="info-step-header">
             <div class="info-step-number">3</div>
             <div>
-              <h3 class="info-step-title">Ty wspierasz i wysyłasz</h3>
+              <h4 class="info-step-title">Ty wspierasz i wysyłasz</h4>
             </div>
           </div>
           <div class="info-step-content">
@@ -118,12 +118,12 @@ <h3 class="info-step-title">Ty wspierasz i wysyłasz</h3>
     </section>
 
     <section class="info-section">
-      <h1 class="info-section-title">DLACZEGO WARTO WYSŁAĆ?</h1>
+      <h2 class="info-section-title">DLACZEGO WARTO WYSŁAĆ?</h2>
       
       <div class="info-grid-2-3">
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Pomoc każdego dnia
           </h3>
           <p class="info-benefit-text">
@@ -134,7 +134,7 @@ <h3 class="info-benefit-title">
 
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Konkretne wsparcie
           </h3>
           <p class="info-benefit-text">
@@ -146,7 +146,7 @@ <h3 class="info-benefit-title">
 
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Proste kroki
           </h3>
           <p class="info-benefit-text">
@@ -157,7 +157,7 @@ <h3 class="info-benefit-title">
 
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Wygodna dostawa
           </h3>
           <p class="info-benefit-text">
@@ -169,7 +169,7 @@ <h3 class="info-benefit-title">
 
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Przejrzyste zasady
           </h3>
           <p class="info-benefit-text">
@@ -181,7 +181,7 @@ <h3 class="info-benefit-title">
 
         <div>
           <h3 class="info-benefit-title">
-            <span class="info-benefit-bullet"></span>
+            <span class="info-benefit-bullet" aria-hidden="true"></span>
             Otwarta inicjatywa
           </h3>
           <p class="info-benefit-text">
@@ -194,5 +194,5 @@ <h3 class="info-benefit-title">
     </section>
 
   </div>
-</div>
+</main>
 {% endblock %}
diff --git a/site/templates/organization.html b/site/templates/organization.html
index 372293b..ed716a9 100755
--- a/site/templates/organization.html
+++ b/site/templates/organization.html
@@ -8,19 +8,20 @@
 
 {% block content %}
 
-<div class="mx-auto mt-6">
+<main class="mx-auto mt-6">
   <!-- ORGANIZATION INFO -->
   <div class="flex justify-center pb-8 md:pb-12">
     <div class="w-11/12 lg:w-11/12 xl:w-8/12 2xl:w-6/12">
       <div class="pb-4 flex justify-between items-center">
         <span class="text-md lg:text-lg font-bold"><span class="text-sectionTitle">wyślij.co/</span><span class="text-black">{{ data.adres }}</span></span>
         <div class="flex items-center gap-3">
-          <button onclick="shareCurrentPage()" class="text-sectionTitle hover:text-amber-600 transition-colors">
+          <button onclick="shareCurrentPage()" class="text-sectionTitle hover:text-amber-600 transition-colors" aria-label="Udostępnij stronę organizacji">
             <svg
               fill="none"
               stroke-width="1.5"
               stroke="currentColor"
               class="size-7 lg:size-9"
+              aria-hidden="true"
             >
               <use href="#icon-share"></use>
             </svg>
@@ -36,19 +37,20 @@ <h1 class="text-black text-3xl lg:text-5xl">{{ data.nazwa }}</h1>
         Wybierz produkt z listy poniżej, a podczas realizacji zamówienia kopiuj i wklejaj dane poniżej, żeby wysłać bezpośrednio do organizacji.
       </div>
 
-      <h1 class="text-sectionTitle mb-2 pl-1 text-2xl">Dane do dostawy</h1>
+      <h2 class="text-sectionTitle mb-2 pl-1 text-2xl">Dane do dostawy</h2>
       
       <!-- Two-column layout on medium screens and up -->
       <div class="md:grid md:grid-cols-2 md:gap-6">
         <!-- Left column: Address -->
         <div class="pb-4">
-          <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Adres</h2>
+          <h3 class="text-sectionTitle mb-2 pl-1 text-lg">Adres</h3>
           <div
             class="copyable-field-first"
             role="button"
             tabindex="0"
             onclick="copyText(this)"
             onkeydown="handleCopyKeydown(event, this)"
+            aria-label="Kopiuj adres uliczny"
           >
             {{ data.dostawa.ulica }}
             <svg
@@ -57,6 +59,7 @@ <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Adres</h2>
               stroke-width="1.5"
               stroke="currentColor"
               class="size-6"
+              aria-hidden="true"
             >
               <use href="#icon-copy"></use>
             </svg>
@@ -67,6 +70,7 @@ <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Adres</h2>
             tabindex="0"
             onclick="copyText(this)"
             onkeydown="handleCopyKeydown(event, this)"
+            aria-label="Kopiuj kod pocztowy"
           >
             {{ data.dostawa.kod }}
             <svg
@@ -200,7 +204,7 @@ <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Uwagi do dostawy</h2>
   <!-- PRODUCTS -->
   <div class="flex justify-center pb-8 md:pb-12">
     <div class="w-11/12 lg:w-11/12 xl:w-8/12 2xl:w-6/12">
-      <h1 class="text-sectionTitle mb-2 pl-1 text-2xl">Potrzebne produkty</h1>
+      <h2 class="text-sectionTitle mb-2 pl-1 text-2xl">Potrzebne produkty</h2>
       
       <!-- Progressive grid layout: 1 col mobile, 3 md, 4 lg -->
       <div class="products-grid">
@@ -208,12 +212,13 @@ <h1 class="text-sectionTitle mb-2 pl-1 text-2xl">Potrzebne produkty</h1>
         <div class="product-tile">
           <a href="{{ produkt.link }}" target="_blank" class="flex flex-col h-full group">
             <div class="flex justify-between items-start mb-2">
-              <h2 class="product-title">{{ produkt.nazwa }}</h2>
+              <h3 class="product-title">{{ produkt.nazwa }}</h3>
               <svg
                 fill="none"
                 stroke-width="1.5"
                 stroke="currentColor"
                 class="product-icon"
+                aria-hidden="true"
               >
                 <use href="#icon-external-link"></use>
               </svg>
@@ -236,17 +241,17 @@ <h2 class="product-title">{{ produkt.nazwa }}</h2>
 
   <div class="flex justify-center pb-6">
     <div class="w-11/12 lg:w-11/12 xl:w-8/12 2xl:w-6/12">
-      <h1 class="text-sectionTitle mb-2 pl-1 text-2xl">Dodatkowe informacje</h1>
+      <h2 class="text-sectionTitle mb-2 pl-1 text-2xl">Dodatkowe informacje</h2>
       
       <!-- Two-column layout on medium screens and up -->
       <div class="md:grid md:grid-cols-2 md:gap-6">
         <div class="pb-4">
-          <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Numer KRS</h2>
+          <h3 class="text-sectionTitle mb-2 pl-1 text-lg">Numer KRS</h3>
           <div class="info-field">{{ data.krs }}</div>
         </div>
 
         <div class="pb-4">
-          <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Strona internetowa</h2>
+          <h3 class="text-sectionTitle mb-2 pl-1 text-lg">Strona internetowa</h3>
           <a
             class="website-link"
             href="{{data.strona}}"
@@ -259,6 +264,7 @@ <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Strona internetowa</h2>
               stroke-width="1.5"
               stroke="currentColor"
               class="size-6 ml-2"
+              aria-hidden="true"
             >
               <use href="#icon-external-link"></use>
             </svg>
@@ -267,6 +273,6 @@ <h2 class="text-sectionTitle mb-2 pl-1 text-lg">Strona internetowa</h2>
       </div>
     </div>
   </div>
-</div>
+</main>
 
 {% endblock content %}
diff --git a/site/templates/organizations.html b/site/templates/organizations.html
index 378b609..f667211 100644
--- a/site/templates/organizations.html
+++ b/site/templates/organizations.html
@@ -1,7 +1,7 @@
 {% extends "base.html" %}
 
 {% block content %}
-<div class="min-h-screen">
+<main class="min-h-screen">
   <div class="info-container">
 
     <!-- Main title -->
@@ -21,18 +21,18 @@ <h1 class="org-list-title">
 
     <!-- Organizations list -->
     <div class="max-w-5xl mx-auto">
-      <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 md:gap-6">
+      <ul class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 md:gap-6">
         {% for organization in organizations %}
-        <div class="org-list-item">
-          <span class="org-list-bullet"></span>
+        <li class="org-list-item">
+          <span class="org-list-bullet" aria-hidden="true"></span>
           <a href="/{{ organization.adres }}" class="org-list-link">
             {{ organization.nazwa }}
           </a>
-        </div>
+        </li>
         {% endfor %}
-      </div>
+      </ul>
     </div>
 
   </div>
-</div>
+</main>
 {% endblock %}
