diff --git a/.gitignore b/.gitignore
index dc7aaaf..e2c911b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,4 @@ dist/
 
 # Textdateien mit Tokens/Keys (Sicherheitsnetz)
 *.txt
+!public/robots.txt
diff --git a/public/pages/login.js b/public/pages/login.js
index 31899c2..35602fc 100644
--- a/public/pages/login.js
+++ b/public/pages/login.js
@@ -12,7 +12,7 @@ import { auth } from '/api.js';
  */
 export async function render(container) {
   container.innerHTML = `
-    <div class="login-page">
+    <main class="login-page" id="main-content">
       <div class="login-card card card--padded">
         <h1 class="login-card__title">Oikos</h1>
         <p class="login-card__subtitle">Familienplaner</p>
@@ -53,7 +53,7 @@ export async function render(container) {
           </button>
         </form>
       </div>
-    </div>
+    </main>
   `;
 
   const form = container.querySelector('#login-form');
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..c68da96
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,5 @@
+# Oikos Familienplaner — self-hosted, private
+# Keine öffentlichen Inhalte zum Indexieren
+
+User-agent: *
+Disallow: /
diff --git a/public/styles/layout.css b/public/styles/layout.css
index 795af74..43b43fc 100644
--- a/public/styles/layout.css
+++ b/public/styles/layout.css
@@ -231,12 +231,12 @@
 }
 
 .btn--primary {
-  background-color: var(--color-accent);
+  background-color: var(--color-btn-primary);
   color: #ffffff;
 }
 
 .btn--primary:hover {
-  background-color: var(--color-accent-hover);
+  background-color: var(--color-btn-primary-hover);
 }
 
 .btn--secondary {
diff --git a/public/styles/tokens.css b/public/styles/tokens.css
index 828fb20..00701a7 100644
--- a/public/styles/tokens.css
+++ b/public/styles/tokens.css
@@ -13,7 +13,7 @@
   --color-surface-2: #F0F0F5;
   --color-border: #E5E5EA;
   --color-text-primary: #1C1C1E;
-  --color-text-secondary: #8E8E93;
+  --color-text-secondary: #6C6C70; /* WCAG AA: ~5.2:1 auf weißem Hintergrund */
   --color-text-disabled: #C7C7CC;
 
   /* --------------------------------------------------------
@@ -22,6 +22,8 @@
   --color-accent: #007AFF;
   --color-accent-hover: #0056CC;
   --color-accent-light: #E3F2FF;
+  --color-btn-primary: #0066DB;       /* WCAG AA: ~5.0:1 auf weiß (Buttons mit weißem Text) */
+  --color-btn-primary-hover: #0056CC;
 
   /* --------------------------------------------------------
    * Farben — Semantisch
@@ -133,7 +135,7 @@
     --color-surface-2: #3A3A3C;
     --color-border: #3A3A3C;
     --color-text-primary: #F5F5F7;
-    --color-text-secondary: #8E8E93;
+    --color-text-secondary: #AEAEB2; /* WCAG AA: ~4.6:1 auf #2C2C2E */
     --color-text-disabled: #48484A;
 
     --color-accent-light: #1A3A5C;