update admin layout

static/css/style.css

@@ -1000,6 +1000,38 @@ td a:hover {
     border-color: rgba(255, 166, 77, 0.35);
 }
 
+.admin-tools-grid {
+    display: grid;
+    gap: 1rem;
+    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+}
+
+.import-form input[type="file"] {
+    width: 100%;
+    margin-top: 0.5rem;
+    margin-bottom: 1rem;
+    color: var(--text-muted);
+}
+
+.import-form input[type="file"]::file-selector-button {
+    appearance: none;
+    border: 1px solid rgba(255, 255, 255, 0.12);
+    background: rgba(255, 255, 255, 0.05);
+    color: var(--text-strong);
+    border-radius: 10px;
+    padding: 0.55rem 0.8rem;
+    font: inherit;
+    font-size: 0.9rem;
+    font-weight: 600;
+    margin-right: 0.75rem;
+    cursor: pointer;
+}
+
+.import-form input[type="file"]::file-selector-button:hover {
+    background: rgba(255, 166, 77, 0.12);
+    border-color: rgba(255, 166, 77, 0.28);
+}
+
 @media (max-width: 980px) {
     .site-shell {
         width: min(100% - 24px, 100%);