ui: refine login and panels

backend/templates/index.html

@@ -25,17 +25,11 @@
         <i data-lucide="shield-check"></i>
         <div>
           <h1>Safe Kiddo Control</h1>
-          <p class="text-muted">Anmeldung erforderlich</p>
         </div>
       </div>
 
       <section id="loginSection">
         <h3><i data-lucide="log-in"></i> Anmeldung</h3>
-        <p class="text-muted mb-1">Melde dich an um Nutzerkonten zu verwalten</p>
-
-        <div style="margin: 1.5rem 0; border-top: 1px solid var(--color-border); position: relative;">
-          <span style="position: absolute; top: -0.6rem; left: 50%; transform: translateX(-50%); background: var(--color-surface); padding: 0 1rem; color: var(--color-text-muted); font-size: 0.75rem;">ODER</span>
-        </div>
 
         <form id="loginForm">
           <div class="grid">
@@ -102,7 +96,7 @@
   </div>
 
   <!-- User Management Section -->
-  <section id="userSection" class="hidden">
+  <section id="userSection" class="panel-section hidden">
     <h3><i data-lucide="users"></i> Nutzerverwaltung</h3>
 
     <button id="refreshUsersBtn" class="secondary small">
@@ -131,7 +125,7 @@
   </section>
 
   <!-- Update Management Section -->
-  <section id="updateSection" class="hidden">
+  <section id="updateSection" class="panel-section hidden">
     <h3><i data-lucide="download"></i> Update-Verwaltung</h3>
 
     <div id="updateStatus" style="background: rgba(10, 14, 20, 0.6); border: 1px solid var(--color-border); border-left: 3px solid var(--color-accent); padding: 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem;">