fix: update admin styles

public/assets/css/admin.css

@@ -117,4 +117,130 @@ body {
         padding: 16px;
     }
 
+}
+
+
+ body {
+     background: #f5f7fa;
+ }
+
+.admin-wrapper {
+    min-height: 100vh;
+}
+
+.admin-sidebar {
+    width: 260px;
+    min-height: 100vh;
+    background: #fff;
+    border-left: 1px solid #e5e7eb;
+    position: fixed;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    z-index: 1000;
+    overflow-y: auto;
+}
+
+.admin-main {
+    margin-right: 260px;
+    min-height: 100vh;
+    display: flex;
+    flex-direction: column;
+}
+
+.admin-header {
+    height: 70px;
+    background: #fff;
+    border-bottom: 1px solid #e5e7eb;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 0 25px;
+}
+
+.admin-content {
+    padding: 25px;
+    flex: 1;
+}
+
+.admin-logo {
+    height: 70px;
+    display: flex;
+    align-items: center;
+    padding: 0 20px;
+    border-bottom: 1px solid #eee;
+}
+
+.admin-logo a {
+    text-decoration: none;
+    font-size: 18px;
+    font-weight: bold;
+    color: #0d6efd;
+}
+
+.admin-menu {
+    padding: 15px 10px;
+}
+
+.admin-menu-title {
+    font-size: 11px;
+    color: #9ca3af;
+    padding: 10px;
+    margin-top: 10px;
+}
+
+.admin-menu a {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    padding: 11px 12px;
+    margin-bottom: 4px;
+    border-radius: 8px;
+    color: #4b5563;
+    text-decoration: none;
+    transition: .2s;
+}
+
+.admin-menu a:hover,
+.admin-menu a.active {
+    background: #eef5ff;
+    color: #0d6efd;
+}
+
+.admin-menu i {
+    width: 22px;
+    text-align: center;
+    font-size: 16px;
+}
+
+.admin-user {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+}
+
+.admin-user-avatar {
+    width: 38px;
+    height: 38px;
+    border-radius: 50%;
+    background: #eef5ff;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: #0d6efd;
+}
+
+.admin-card {
+    background: #fff;
+    border: 1px solid #e5e7eb;
+    border-radius: 12px;
+}
+
+@media (max-width: 991px) {
+
+    .admin-sidebar {
+        transform: translateX(100%);
+    }
+
+
 }