update

Packages/app.rive.rive-unity/Editor/Components/Styles/StyleHelper.cs

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+using UnityEditor;
+using UnityEngine.UIElements;
+
+namespace Rive
+{
+    /// <summary>
+    /// Helper class for styling Rive components.
+    /// </summary>
+    internal class StyleHelper
+    {
+        // USS Class Names
+        /// <summary>
+        /// The block class name for the Rive inspector.
+        /// </summary>
+        public const string CLASS_BLOCK = "rive-inspector";
+
+        /// <summary>
+        /// The element class name for sections within the Rive inspector.
+        /// </summary>
+        public const string CLASS_SECTION = "rive-inspector__section";
+
+        /// <summary>
+        /// The element class name for section labels within the Rive inspector.
+        /// </summary>
+        public const string CLASS_SECTION_LABEL = "rive-inspector__section-label";
+
+        /// <summary>
+        /// The element class name for fields within the Rive inspector.
+        /// </summary>
+        public const string CLASS_FIELD = "rive-inspector__field";
+
+        /// <summary>
+        /// Container that wraps a field and its optional help button.
+        /// </summary>
+        public const string CLASS_FIELD_CONTAINER = "rive-inspector__field-container";
+
+        /// <summary>
+        /// Class name applied to the primary field element inside a container.
+        /// </summary>
+        public const string CLASS_FIELD_CONTENT = "rive-inspector__field-content";
+
+        /// <summary>
+        /// Class name applied to the help/info buttons.
+        /// </summary>
+        public const string CLASS_FIELD_HELP_BUTTON = "rive-inspector__field-help-button";
+
+
+        private static StyleSheet s_StyleSheet;
+
+        public static StyleSheet StyleSheet
+        {
+            get
+            {
+                if (s_StyleSheet == null)
+                {
+                    string ussPath = "Packages/app.rive.rive-unity/Editor/Components/Styles/RiveInspectorStyleSheet.uss";
+                    s_StyleSheet = AssetDatabase.LoadAssetAtPath<StyleSheet>(ussPath);
+                }
+                return s_StyleSheet;
+            }
+        }
+    }
+}