layer control redesign

public/styles.css

@@ -435,6 +435,69 @@ select.form-input { cursor: pointer; }
     border-radius: 4px;
 }
 
+/* Layer Control Expanded Dropdown */
+.leaflet-control-layers-expanded {
+    padding: 0 !important;
+    background: var(--color-surface) !important;
+    font-family: var(--font-body) !important;
+    border-radius: 10px !important;
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15) !important;
+    border: 1px solid var(--color-border) !important;
+    min-width: 220px;
+}
+
+.leaflet-control-layers-list {
+    padding: 8px 0;
+}
+
+.leaflet-control-layers-separator {
+    border-top: 1px solid var(--color-border) !important;
+    margin: 4px 12px !important;
+}
+
+.leaflet-control-layers label {
+    display: flex !important;
+    align-items: center !important;
+    gap: 8px !important;
+    padding: 8px 16px !important;
+    margin: 0 !important;
+    cursor: pointer !important;
+    font-size: 0.83rem !important;
+    color: var(--color-text) !important;
+    transition: background var(--transition-fast);
+}
+
+.leaflet-control-layers label:hover {
+    background: var(--color-bg) !important;
+}
+
+.leaflet-control-layers input[type="radio"],
+.leaflet-control-layers input[type="checkbox"] {
+    accent-color: var(--color-primary);
+    width: 16px;
+    height: 16px;
+    cursor: pointer;
+    flex-shrink: 0;
+}
+
+/* Layer Control Header — only visible when expanded */
+.layer-control-header {
+    background: var(--color-primary);
+    color: white;
+    font-family: var(--font-body);
+    font-size: 0.85rem;
+    font-weight: 600;
+    padding: 10px 16px;
+    display: none;
+    align-items: center;
+    gap: 8px;
+    border-radius: 10px 10px 0 0;
+}
+
+.leaflet-control-layers-expanded .layer-control-header {
+    display: flex;
+}
+
 
 /* -----------------------------------------------------------------
    4.3 Sidebar Overrides