styles

src/app/shared/components/layout/sidebar/sidebar.component.css

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+/* Verschieben Sie alle .sidebar... und .nav-item... Klassen aus styles.css hierher */
+:host {
+  display: block;
+}
+
+.sidebar {
+  width: 260px;
+  height: 100vh;
+  position: sticky;
+  top: 0;
+  display: flex;
+  flex-direction: column;
+  padding: 1.5rem;
+  background: var(--glass-bg);
+  backdrop-filter: var(--glass-backdrop-filter);
+  -webkit-backdrop-filter: var(--glass-backdrop-filter);
+  border-right: 1px solid var(--color-border);
+  transition: background-color var(--transition-speed),
+    border-color var(--transition-speed);
+}
+.sidebar-header {
+  margin-bottom: 2rem;
+}
+.sidebar-title {
+  font-size: 1.5rem;
+  font-weight: 900;
+}
+.sidebar-nav {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+  flex-grow: 1;
+}
+.sidebar-footer {
+  margin-top: auto;
+}
+.nav-item {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  padding: 0.75rem 1rem;
+  border-radius: var(--border-radius-md);
+  color: var(--color-text-light);
+  font-weight: 500;
+  text-decoration: none;
+  transition: all var(--transition-speed);
+}
+.nav-item app-icon {
+  font-size: 20px; /* Steuert die Größe des Icons */
+  transition: color var(--transition-speed);
+}
+.nav-item:hover {
+  background-color: rgba(0, 0, 0, 0.05);
+  color: var(--color-text);
+}
+:host-context(body.dark-theme) .nav-item:hover {
+  background-color: rgba(255, 255, 255, 0.05);
+}
+.nav-item.active {
+  background: var(--color-primary-gradient);
+  color: #fff;
+  box-shadow: 0 4px 10px rgba(52, 152, 219, 0.4);
+}
+.nav-item.active app-icon {
+  color: #fff;
+}

src/app/shared/components/layout/sidebar/sidebar.component.html

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+<aside class="sidebar">
+  <div class="sidebar-header">
+    <h1 class="sidebar-title">CustomDash</h1>
+  </div>
+
+  <nav class="sidebar-nav">
+    <a
+      class="nav-item"
+      [class.active]="activeRoute === 'dashboard'"
+      (click)="setActive('dashboard')"
+    >
+      <app-icon name="placeholder"></app-icon>
+      <span>Übersicht</span>
+    </a>
+
+    <a
+      class="nav-item"
+      [class.active]="activeRoute === 'analytics'"
+      (click)="setActive('analytics')"
+    >
+      <app-icon name="placeholder"></app-icon>
+      <span>Analysen</span>
+    </a>
+
+    <a
+      class="nav-item"
+      [class.active]="activeRoute === 'reports'"
+      (click)="setActive('reports')"
+    >
+      <app-icon name="placeholder"></app-icon>
+      <span>Berichte</span>
+    </a>
+  </nav>
+
+  <div class="sidebar-footer">
+    <a
+      class="nav-item"
+      [class.active]="activeRoute === 'settings'"
+      (click)="setActive('settings')"
+    >
+      <app-icon name="placeholder"></app-icon>
+      <span>Einstellungen</span>
+    </a>
+  </div>
+</aside>

src/app/shared/components/layout/sidebar/sidebar.component.ts

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+import { Component } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { IconComponent } from '../../ui/icon/icon.component';
+
+@Component({
+  selector: 'app-sidebar',
+  standalone: true,
+  imports: [CommonModule, IconComponent],
+  templateUrl: './sidebar.component.html',
+  styleUrl: './sidebar.component.css'
+})
+export class SidebarComponent {
+  // Wir verwalten nur noch, welcher Link aktiv ist. 'dashboard' ist der Standard.
+  activeRoute = 'dashboard';
+
+  // Methode, um den aktiven Link bei einem Klick zu ändern.
+  // In einer echten App würde dies durch den Angular Router gesteuert werden.
+  setActive(route: string): void {
+    this.activeRoute = route;
+  }
+}