diff --git a/libs/css/src/lib.rs b/libs/css/src/lib.rs
index 740a3e52..456cd4bd 100644
--- a/libs/css/src/lib.rs
+++ b/libs/css/src/lib.rs
@@ -353,6 +353,26 @@ mod tests {
     #[case("with-dash", "with-dash")]
     #[case("with_underscore", "with_underscore")]
     #[case("CamelCase123", "CamelCase123")]
+    // Additional cases for full coverage of special characters
+    #[case("<", "_lt_")]
+    #[case("*", "_st_")]
+    #[case(",", "_cm_")]
+    #[case("'", "_sq_")]
+    #[case("/", "_sl_")]
+    #[case("\\", "_bs_")]
+    #[case("%", "_pc_")]
+    #[case("^", "_cr_")]
+    #[case("$", "_dl_")]
+    #[case("|", "_pp_")]
+    #[case("@", "_at_")]
+    #[case("!", "_ex_")]
+    #[case("?", "_qm_")]
+    #[case(";", "_sc_")]
+    #[case("{", "_lc_")]
+    #[case("}", "_rc_")]
+    // Unicode character (non-ASCII)
+    #[case("한글", "_ud55c__uae00_")]
+    #[case("emoji😀", "emoji_u1f600_")]
     fn test_encode_selector(#[case] input: &str, #[case] expected: &str) {
         assert_eq!(encode_selector(input), expected);
     }
diff --git a/libs/extractor/src/lib.rs b/libs/extractor/src/lib.rs
index d24faa7f..daec4d15 100644
--- a/libs/extractor/src/lib.rs
+++ b/libs/extractor/src/lib.rs
@@ -9422,6 +9422,12 @@ globalCss({
         "@devup-ui/react",
         true
     )] // .jsx
+    #[case(
+        "test.unknown",
+        "import { Box } from '@devup-ui/react';",
+        "@devup-ui/react",
+        false
+    )] // unsupported file extension
     fn test_has_devup_ui(
         #[case] filename: &str,
         #[case] code: &str,
diff --git a/libs/sheet/src/lib.rs b/libs/sheet/src/lib.rs
index 41942e0b..86124fa3 100644
--- a/libs/sheet/src/lib.rs
+++ b/libs/sheet/src/lib.rs
@@ -521,33 +521,19 @@ impl StyleSheet {
                         match kind {
                             AtRuleKind::Media => {
                                 // Combine @media queries with 'and'
-                                format!(
-                                    "@media(min-width:{break_point}px)and {query}{{{inner_css}}}"
-                                )
+                                format!("@media(min-width:{break_point}px)and {query}{{{inner_css}}}")
                             }
                             AtRuleKind::Supports => {
                                 // Nest @supports inside @media for breakpoint
-                                format!(
-                                    "@media(min-width:{break_point}px){{@supports{query}{{{inner_css}}}}}"
-                                )
+                                format!("@media(min-width:{break_point}px){{@supports{query}{{{inner_css}}}}}")
                             }
                             AtRuleKind::Container => {
                                 // Nest @container inside @media for breakpoint
-                                format!(
-                                    "@media(min-width:{break_point}px){{@container{query}{{{inner_css}}}}}"
-                                )
+                                format!("@media(min-width:{break_point}px){{@container{query}{{{inner_css}}}}}")
                             }
                         }
                     } else {
-                        format!(
-                            "@{kind}{}{{{}}}",
-                            if query.starts_with("(") {
-                                query.clone()
-                            } else {
-                                format!(" {query}")
-                            },
-                            inner_css.as_str()
-                        )
+                        format!("@{kind}{}{{{}}}", if query.starts_with("(") { query.clone() } else { format!(" {query}") }, inner_css.as_str())
                     }
                     .as_str(),
                 );
diff --git a/packages/react/src/stores/__tests__/theme-store.test.ts b/packages/react/src/stores/__tests__/theme-store.browser.test.ts
similarity index 97%
rename from packages/react/src/stores/__tests__/theme-store.test.ts
rename to packages/react/src/stores/__tests__/theme-store.browser.test.ts
index 5c02f491..b96d5f58 100644
--- a/packages/react/src/stores/__tests__/theme-store.test.ts
+++ b/packages/react/src/stores/__tests__/theme-store.browser.test.ts
@@ -1,3 +1,6 @@
+// Import from bun-test-env-dom to enable DOM environment
+import 'bun-test-env-dom'
+
 import {
   afterAll,
   afterEach,