Added functionality to all pages

frontend/assets/css/theme.css

@@ -1,4 +1,3 @@
-/* theme.css */
 :root {
     --bg: #111827;
     --card: #1f2937;
@@ -18,19 +17,20 @@
 }
 
 body {
-    margin: 0;
     min-height: 100vh;
     background: var(--bg);
     color: var(--text);
     font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
     display: flex;
     flex-direction: column;
+}
+
+body:not(.dashboard-layout) {
     justify-content: center;
     align-items: center;
     padding: 1rem;
 }
 
-/* Gemeinsames Card-Layout für Home, Login, Register und 404 */
 .card {
     width: 100%;
     max-width: 400px;
@@ -55,7 +55,6 @@ body {
     margin-bottom: 2rem;
 }
 
-/* Button & Link Standard-Skins */
 .btn {
     display: inline-flex;
     justify-content: center;
@@ -95,7 +94,6 @@ body {
     border-color: var(--accent);
 }
 
-/* Formular-Elemente */
 .form-group {
     margin-bottom: 1.25rem;
 }
@@ -147,7 +145,6 @@ input::placeholder {
     text-decoration: underline;
 }
 
-/* Feedback-Boxen */
 .message {
     display: none;
     margin-top: 1.25rem;
@@ -168,4 +165,72 @@ input::placeholder {
     background: rgba(16, 185, 129, 0.1);
     border: 1px solid rgba(16, 185, 129, 0.2);
     color: var(--success);
+}
+
+.modal {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(17, 24, 39, 0.7);
+    backdrop-filter: blur(4px);
+    display: none;
+    justify-content: center;
+    align-items: center;
+    z-index: 1000;
+}
+
+.modal.show {
+    display: flex;
+}
+
+.modal-content {
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 2rem;
+    width: 90%;
+    max-width: 500px;
+    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
+    position: relative;
+    transform: translateY(20px);
+    opacity: 0;
+    animation: modalSlideIn 0.3s forwards ease-out;
+}
+
+@keyframes modalSlideIn {
+    to {
+        transform: translateY(0);
+        opacity: 1;
+    }
+}
+
+.modal-content h2 {
+    margin-top: 0;
+    margin-bottom: 1.5rem;
+    font-size: 1.5rem;
+}
+
+.button-group {
+    display: flex;
+    gap: 1rem;
+    margin-top: 2rem;
+}
+
+.danger-btn {
+    background: rgba(239, 68, 68, 0.1) !important;
+    color: var(--error) !important;
+    border: 1px solid rgba(239, 68, 68, 0.2) !important;
+}
+
+.danger-btn:hover {
+    background: var(--error) !important;
+    color: white !important;
+}
+
+.table-loader {
+    padding: 3rem;
+    text-align: center;
+    color: var(--text-muted);
 }