Refactor button styles and layout adjustments

Updated button styles for improved layout and transitions.

css/main.css

@@ -89,6 +89,7 @@ button, input[type=submit] {
     width: 100%;
 }
 
+/* BUTTONS: Statisch, stabilisiert und mit festen 4px Margin */
 .primary, .secondary {
     text-decoration: none;
     font-weight: bold;
@@ -100,22 +101,23 @@ button, input[type=submit] {
     letter-spacing: 1px;
     width: 100%; 
     
-    transition: background-color 0.2s ease, filter 0.2s ease, opacity 0.2s ease;
+    line-height: 1.2;
+    transition: background-color 0.1s linear, filter 0.1s linear, opacity 0.1s linear;
+    
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    font-smooth: never;
     
     transform: translateZ(0); 
+    will-change: background-color;
     backface-visibility: hidden;
-    perspective: 1000px;
-    
-    vertical-align: middle;
-    -webkit-font-smoothing: antialiased;
 }
 
 .primary {
     background: var(--foreground);
     color: var(--app-background) !important;
     border-radius: 4px;
-    border: none;
-    transform: none !important; 
+    border: 1px solid var(--foreground);
 }
 
 .primary:hover {
@@ -128,7 +130,6 @@ button, input[type=submit] {
     color: var(--foreground);
     border: 1px solid var(--foreground);
     border-radius: 4px;
-    transform: translateZ(0);
 }
 
 .secondary:hover {
@@ -136,7 +137,7 @@ button, input[type=submit] {
     transform: none !important;
 }
 
-/* Fix für Button-Container (entfernt versteckte Gaps) */
+/* Fix für Button-Container (entfernt versteckte Gaps und stabilisiert Layout) */
 .actions, 
 .ClientView .actions, 
 .ClientListView .actions,
@@ -144,14 +145,17 @@ button, input[type=submit] {
     display: flex !important;
     flex-direction: column !important;
     gap: 0px !important; 
+    align-items: stretch;
+    justify-content: flex-start;
+    backface-visibility: hidden;
 }
 
-/* Entfernt den Abstand beim letzten Button in einer Gruppe für saubere Optik */
+/* Entfernt den Abstand beim letzten Button in einer Gruppe */
 .actions > *:last-child {
     margin-bottom: 0 !important;
 }
 
-/* Input Felder: Dunkel statt Weiß */
+/* Input Felder */
 input[type='text'].large {
     width: 100%;
     padding: 14px;