diff --git a/app/src/main/java/dev/kaizen/app/auth/LoginScreen.kt b/app/src/main/java/dev/kaizen/app/auth/LoginScreen.kt
index 3e70a82..7b1cb5f 100644
--- a/app/src/main/java/dev/kaizen/app/auth/LoginScreen.kt
+++ b/app/src/main/java/dev/kaizen/app/auth/LoginScreen.kt
@@ -50,6 +50,7 @@ import dev.kaizen.app.net.LoginResult
 import dev.kaizen.app.net.SessionViewModel
 import dev.kaizen.app.ui.effect.KaizenShadows
 import dev.kaizen.app.ui.effect.kaizenShadow
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import androidx.compose.ui.res.stringResource
 import dev.kaizen.app.R
@@ -143,7 +144,7 @@ fun LoginScreen(session: SessionViewModel, modifier: Modifier = Modifier) {
 
             if (error != null) {
                 Spacer(Modifier.size(14.dp))
-                Text(error!!, color = Color(0xFFEF4444), fontSize = 13.sp)
+                Text(error!!, color = KaizenSemanticColors.error, fontSize = 13.sp)
             }
 
             Spacer(Modifier.size(24.dp))
diff --git a/app/src/main/java/dev/kaizen/app/auth/PasswordUnlockDialog.kt b/app/src/main/java/dev/kaizen/app/auth/PasswordUnlockDialog.kt
index b7f9b1e..882bb8d 100644
--- a/app/src/main/java/dev/kaizen/app/auth/PasswordUnlockDialog.kt
+++ b/app/src/main/java/dev/kaizen/app/auth/PasswordUnlockDialog.kt
@@ -46,6 +46,7 @@ import dev.kaizen.app.R
 import dev.kaizen.app.ui.effect.GlassSurface
 import dev.kaizen.app.ui.effect.GlassTiers
 import dev.kaizen.app.ui.shape.KaizenShapes
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 
 @Composable
@@ -90,7 +91,7 @@ fun PasswordUnlockDialog(
 
                 if (error != null) {
                     Spacer(Modifier.size(10.dp))
-                    Text(error, color = Color(0xFFEF4444), fontSize = 12.sp)
+                    Text(error, color = KaizenSemanticColors.error, fontSize = 12.sp)
                 }
 
                 Spacer(Modifier.size(20.dp))
diff --git a/app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt b/app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt
index aeae916..e234425 100644
--- a/app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt
@@ -68,6 +68,7 @@ import dev.kaizen.app.ui.effect.KaizenShadows
 import dev.kaizen.app.ui.effect.kaizenShadow
 import dev.kaizen.app.ui.motion.Durations
 import dev.kaizen.app.ui.shape.KaizenShapes
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import dev.kaizen.app.R
 import androidx.compose.ui.res.stringResource
@@ -185,7 +186,7 @@ fun ModePillsRow(
             DropdownMenu(
                 expanded = showReasoningMenu,
                 onDismissRequest = { showReasoningMenu = false },
-                containerColor = if (isDark) Color(0xFF1A2030) else Color(0xFFF8F9FB),
+                containerColor = if (isDark) KaizenSemanticColors.dropdownDark else KaizenSemanticColors.dropdownLight,
                 shadowElevation = 16.dp,
                 shape = KaizenShapes.md,
             ) {
@@ -225,7 +226,7 @@ fun ModePillsRow(
             DropdownMenu(
                 expanded = showSamplingPopup,
                 onDismissRequest = { showSamplingPopup = false },
-                containerColor = if (isDark) Color(0xFF1A2030) else Color(0xFFF8F9FB),
+                containerColor = if (isDark) KaizenSemanticColors.dropdownDark else KaizenSemanticColors.dropdownLight,
                 shadowElevation = 16.dp,
                 shape = KaizenShapes.md,
             ) {
@@ -278,7 +279,7 @@ fun ModePillsRow(
                     DropdownMenu(
                         expanded = showSearchProviderMenu,
                         onDismissRequest = { showSearchProviderMenu = false },
-                        containerColor = if (isDark) Color(0xFF1A2030) else Color(0xFFF8F9FB),
+                        containerColor = if (isDark) KaizenSemanticColors.dropdownDark else KaizenSemanticColors.dropdownLight,
                         shadowElevation = 16.dp,
                         shape = KaizenShapes.md,
                     ) {
@@ -535,7 +536,7 @@ fun MessageRow(
             ) {
                 MessageActionButton(
                     icon = if (copied) KaizenIcons.Check else KaizenIcons.ClipboardCopy,
-                    tint = if (copied) Color(0xFF10B981) else cs.onSurfaceVariant.copy(alpha = 0.55f),
+                    tint = if (copied) KaizenSemanticColors.success else cs.onSurfaceVariant.copy(alpha = 0.55f),
                 ) {
                     haptics.tick()
                     copied = true
@@ -553,7 +554,7 @@ fun MessageRow(
                     }
                 }
                 onDelete?.let { del ->
-                    MessageActionButton(KaizenIcons.Trash, Color(0xFFEF4444).copy(alpha = 0.70f)) {
+                    MessageActionButton(KaizenIcons.Trash, KaizenSemanticColors.error.copy(alpha = 0.70f)) {
                         haptics.tick(); del(message.wireId)
                     }
                 }
@@ -595,7 +596,7 @@ fun MessageRow(
             ) {
                 MessageActionButton(
                     icon = if (copied) KaizenIcons.Check else KaizenIcons.ClipboardCopy,
-                    tint = if (copied) Color(0xFF10B981) else cs.onSurfaceVariant.copy(alpha = 0.55f),
+                    tint = if (copied) KaizenSemanticColors.success else cs.onSurfaceVariant.copy(alpha = 0.55f),
                 ) {
                     haptics.tick()
                     copied = true
@@ -619,7 +620,7 @@ fun MessageRow(
                     }
                 }
                 onDelete?.let { del ->
-                    MessageActionButton(KaizenIcons.Trash, Color(0xFFEF4444).copy(alpha = 0.70f)) {
+                    MessageActionButton(KaizenIcons.Trash, KaizenSemanticColors.error.copy(alpha = 0.70f)) {
                         haptics.tick(); del(message.wireId)
                     }
                 }
@@ -761,7 +762,7 @@ fun ChatInput(
                     Spacer(Modifier.weight(1f))
                     Box(
                         Modifier.size(42.dp).clip(KaizenShapes.circle)
-                            .background(Color(0xFFEF4444))
+                            .background(KaizenSemanticColors.error)
                             .clickable(onClick = onMicClick),
                         contentAlignment = Alignment.Center,
                     ) {
@@ -854,7 +855,7 @@ private fun PendingFileChip(pf: PendingFile, onRemove: () -> Unit) {
             }
         }
         if (pf.error != null) {
-            Box(Modifier.fillMaxSize().background(Color(0xFFDC2626).copy(alpha = 0.3f)), contentAlignment = Alignment.Center) {
+            Box(Modifier.fillMaxSize().background(KaizenSemanticColors.errorDeep.copy(alpha = 0.3f)), contentAlignment = Alignment.Center) {
                 Icon(KaizenIcons.X, stringResource(R.string.chat_error), tint = Color.White, modifier = Modifier.size(18.dp))
             }
         }
@@ -939,7 +940,7 @@ private fun StopButton(onClick: () -> Unit) {
             .size(38.dp)
             .scale(pressScale)
             .clip(KaizenShapes.circle)
-            .background(Color(0xFFEF4444).copy(alpha = if (isDark) 0.85f else 0.80f))
+            .background(KaizenSemanticColors.error.copy(alpha = if (isDark) 0.85f else 0.80f))
             .clickable(interactionSource = interaction, indication = null, onClick = onClick),
         contentAlignment = Alignment.Center,
     ) {
@@ -1033,8 +1034,8 @@ fun AttachmentMenu(
         horizontalAlignment = Alignment.Start,
     ) {
         AttachPill(KaizenIcons.Camera, stringResource(R.string.attach_camera), accent.primary, isDark, onCamera)
-        AttachPill(KaizenIcons.Image, stringResource(R.string.attach_gallery), Color(0xFF6366F1), isDark, onGallery)
-        AttachPill(KaizenIcons.File, stringResource(R.string.attach_file), Color(0xFF10B981), isDark, onFile)
+        AttachPill(KaizenIcons.Image, stringResource(R.string.attach_gallery), KaizenSemanticColors.indigo, isDark, onGallery)
+        AttachPill(KaizenIcons.File, stringResource(R.string.attach_file), KaizenSemanticColors.success, isDark, onFile)
     }
 }
 
diff --git a/app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt b/app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt
index 2c7dd78..58d2a00 100644
--- a/app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt
@@ -59,6 +59,7 @@ import androidx.compose.ui.unit.sp
 import dev.kaizen.app.ui.effect.GlassSurface
 import dev.kaizen.app.ui.effect.GlassTiers
 import dev.kaizen.app.ui.effect.KaizenShadows
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.shape.KaizenShapes
 import dev.kaizen.app.R
 import dev.kaizen.app.db.MessageEntity
@@ -1045,13 +1046,13 @@ fun ChatScreen(
                                     .statusBarsPadding()
                                     .padding(top = 62.dp, start = 24.dp, end = 24.dp)
                                     .clip(KaizenShapes.sm)
-                                    .background(Color(0xFFDC2626).copy(alpha = 0.15f))
-                                    .border(1.dp, Color(0xFFDC2626).copy(alpha = 0.3f), KaizenShapes.sm)
+                                    .background(KaizenSemanticColors.errorDeep.copy(alpha = 0.15f))
+                                    .border(1.dp, KaizenSemanticColors.errorDeep.copy(alpha = 0.3f), KaizenShapes.sm)
                                     .padding(horizontal = 14.dp, vertical = 8.dp),
                             ) {
                                 Text(
                                     loadError!!,
-                                    color = Color(0xFFDC2626),
+                                    color = KaizenSemanticColors.errorDeep,
                                     fontSize = 12.sp,
                                     fontWeight = FontWeight.Medium,
                                 )
diff --git a/app/src/main/java/dev/kaizen/app/chat/Markdown.kt b/app/src/main/java/dev/kaizen/app/chat/Markdown.kt
index 0547638..90803cd 100644
--- a/app/src/main/java/dev/kaizen/app/chat/Markdown.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/Markdown.kt
@@ -36,6 +36,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import androidx.compose.ui.platform.LocalClipboard
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.AnnotatedString
@@ -446,7 +447,7 @@ fun MarkdownText(text: String, streaming: Boolean = false, modifier: Modifier =
     val codeBorder = if (isDark) Color.White.copy(alpha = 0.08f) else Color.Black.copy(alpha = 0.06f)
     val inlineCodeBg = if (isDark) Color(0xFF1E2433) else Color(0xFFEBEDF0)
     val inlineCodeColor = if (isDark) Color(0xFFE06C75) else Color(0xFFD63384)
-    val linkColor = if (isDark) Color(0xFF60A5FA) else Color(0xFF2563EB)
+    val linkColor = if (isDark) KaizenSemanticColors.linkDark else KaizenSemanticColors.linkLight
     val langBadgeColor = cs.onSurfaceVariant.copy(alpha = 0.5f)
     val tableBorder = if (isDark) Color.White.copy(alpha = 0.10f) else Color.Black.copy(alpha = 0.08f)
     val tableHeaderBg = if (isDark) Color.White.copy(alpha = 0.05f) else Color.Black.copy(alpha = 0.03f)
@@ -729,7 +730,7 @@ private fun CopyButton(code: String) {
         Icon(
             imageVector = if (copied) KaizenIcons.Check else KaizenIcons.Copy,
             contentDescription = "Kopieren",
-            tint = if (copied) Color(0xFF22C55E) else cs.onSurfaceVariant.copy(alpha = 0.5f),
+            tint = if (copied) KaizenSemanticColors.successBright else cs.onSurfaceVariant.copy(alpha = 0.5f),
             modifier = Modifier.size(14.dp),
         )
     }
diff --git a/app/src/main/java/dev/kaizen/app/chat/ModelSheet.kt b/app/src/main/java/dev/kaizen/app/chat/ModelSheet.kt
index 8619837..af7a86f 100644
--- a/app/src/main/java/dev/kaizen/app/chat/ModelSheet.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/ModelSheet.kt
@@ -21,6 +21,7 @@ import androidx.compose.ui.unit.sp
 import dev.kaizen.app.net.KaizenModel
 import dev.kaizen.app.R
 import androidx.compose.ui.res.stringResource
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import dev.kaizen.app.haptics.rememberHaptics
 import dev.kaizen.app.ui.icon.KaizenIcons
@@ -91,10 +92,10 @@ data class ProviderInfo(
 fun getProviderInfo(modelId: String, provider: String?): ProviderInfo {
     return when {
         provider == "vertex" || modelId.startsWith("vertex:") -> {
-            ProviderInfo("Vertex AI", Color(0xFF6366F1)) // Indigo for Vertex AI
+            ProviderInfo("Vertex AI", KaizenSemanticColors.indigo)
         }
         else -> {
-            ProviderInfo("OpenRouter", Color(0xFF10B981)) // Emerald Green for OpenRouter
+            ProviderInfo("OpenRouter", KaizenSemanticColors.success)
         }
     }
 }
diff --git a/app/src/main/java/dev/kaizen/app/chat/Sidebar.kt b/app/src/main/java/dev/kaizen/app/chat/Sidebar.kt
index 8aeac31..e47a1f6 100644
--- a/app/src/main/java/dev/kaizen/app/chat/Sidebar.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/Sidebar.kt
@@ -54,6 +54,7 @@ import dev.kaizen.app.ui.effect.kaizenShadow
 import dev.kaizen.app.ui.effect.innerTopHighlight
 import dev.kaizen.app.ui.shape.KaizenShapes
 import dev.kaizen.app.R
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import androidx.compose.ui.res.stringResource
 import java.time.Instant
@@ -354,7 +355,7 @@ fun KaizenSidebar(
                     onAction(SidebarAction.Delete(target.id))
                     deleteTarget = null
                 }) {
-                    Text(stringResource(R.string.sidebar_confirm), color = Color(0xFFEF4444))
+                    Text(stringResource(R.string.sidebar_confirm), color = KaizenSemanticColors.error)
                 }
             },
             dismissButton = {
@@ -506,7 +507,7 @@ private fun HistoryItemRow(
         androidx.compose.material3.DropdownMenu(
             expanded = showMenu,
             onDismissRequest = { showMenu = false },
-            containerColor = if (isDark) Color(0xFF1A2030) else Color(0xFFF8F9FB),
+            containerColor = if (isDark) KaizenSemanticColors.dropdownDark else KaizenSemanticColors.dropdownLight,
             shadowElevation = 16.dp,
             shape = KaizenShapes.md,
         ) {
@@ -531,7 +532,7 @@ private fun HistoryItemRow(
                     .height(0.5.dp)
                     .background(if (isDark) Color.White.copy(alpha = 0.08f) else Color.Black.copy(alpha = 0.06f))
             )
-            MenuRow(KaizenIcons.Trash, stringResource(R.string.sidebar_delete), Color(0xFFEF4444)) { showMenu = false; onDelete() }
+            MenuRow(KaizenIcons.Trash, stringResource(R.string.sidebar_delete), KaizenSemanticColors.error) { showMenu = false; onDelete() }
         }
     }
 }
diff --git a/app/src/main/java/dev/kaizen/app/chat/StreamBlocks.kt b/app/src/main/java/dev/kaizen/app/chat/StreamBlocks.kt
index 9789dfd..2548a83 100644
--- a/app/src/main/java/dev/kaizen/app/chat/StreamBlocks.kt
+++ b/app/src/main/java/dev/kaizen/app/chat/StreamBlocks.kt
@@ -38,6 +38,7 @@ import dev.kaizen.app.net.SearchSource
 import dev.kaizen.app.net.ToolEvent
 import dev.kaizen.app.R
 import dev.kaizen.app.ui.shape.KaizenShapes
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
@@ -148,7 +149,7 @@ fun ToolEventsBlock(tools: List<ToolEvent>, streaming: Boolean = false) {
         completed.forEach { tool ->
             Row(verticalAlignment = Alignment.CenterVertically) {
                 val icon = if (tool.type == "error") KaizenIcons.AlertCircle else KaizenIcons.Check
-                val tint = if (tool.type == "error") Color(0xFFEF4444) else Color(0xFF10B981)
+                val tint = if (tool.type == "error") KaizenSemanticColors.error else KaizenSemanticColors.success
                 Icon(icon, null, tint = tint, modifier = Modifier.size(14.dp))
                 Spacer(Modifier.width(6.dp))
                 Text(tool.name, color = cs.onSurfaceVariant.copy(alpha = 0.6f), fontSize = 12.sp)
diff --git a/app/src/main/java/dev/kaizen/app/settings/SecuritySection.kt b/app/src/main/java/dev/kaizen/app/settings/SecuritySection.kt
index 7aa2921..02272c7 100644
--- a/app/src/main/java/dev/kaizen/app/settings/SecuritySection.kt
+++ b/app/src/main/java/dev/kaizen/app/settings/SecuritySection.kt
@@ -52,6 +52,7 @@ import dev.kaizen.app.R
 import dev.kaizen.app.net.AppDevice
 import dev.kaizen.app.net.ServerConfig
 import dev.kaizen.app.ui.shape.KaizenShapes
+import dev.kaizen.app.ui.theme.KaizenSemanticColors
 import dev.kaizen.app.ui.theme.LocalKaizenAccent
 import dev.kaizen.app.ui.icon.KaizenIcons
 
@@ -216,7 +217,7 @@ private fun DeviceRow(device: AppDevice, onRevoke: () -> Unit) {
         if (!device.isCurrent) {
             Text(
                 stringResource(R.string.settings_device_revoke),
-                color = Color(0xFFEF4444),
+                color = KaizenSemanticColors.error,
                 fontSize = 12.sp,
                 fontWeight = FontWeight.Medium,
                 modifier = Modifier
@@ -270,7 +271,7 @@ private fun PasswordChangeForm(
         })
 
         if (localError != null) {
-            Text(localError!!, color = Color(0xFFEF4444), fontSize = 12.sp)
+            Text(localError!!, color = KaizenSemanticColors.error, fontSize = 12.sp)
         }
         if (result == "ok") {
             Text(successMsg, color = accent.primary, fontSize = 12.sp, fontWeight = FontWeight.Medium)
diff --git a/app/src/main/java/dev/kaizen/app/ui/theme/Color.kt b/app/src/main/java/dev/kaizen/app/ui/theme/Color.kt
index 9770115..b38a036 100644
--- a/app/src/main/java/dev/kaizen/app/ui/theme/Color.kt
+++ b/app/src/main/java/dev/kaizen/app/ui/theme/Color.kt
@@ -45,3 +45,19 @@ val BlobAmber = p3(0.992f, 0.767f, 0.282f)   // oklch(0.85 0.15 83)  gold
 val BlobCoral = p3(1.000f, 0.562f, 0.230f)   // oklch(0.78 0.18 50)  coral
 val BlobHoney = p3(0.917f, 0.853f, 0.471f)   // oklch(0.88 0.12 100) honey
 val BlobTeal  = p3(0.461f, 0.885f, 0.908f)   // oklch(0.85 0.10 200) teal accent
+
+// ── Semantic Colors (theme-independent) ───────────────────────────────────
+// Used across the app for status, actions, and provider branding.
+// Single source of truth — never use raw hex outside this file.
+
+object KaizenSemanticColors {
+    val error          = Color(0xFFEF4444)   // destructive actions, stop, delete
+    val errorDeep      = Color(0xFFDC2626)   // error banners, stronger emphasis
+    val success        = Color(0xFF10B981)   // success confirmation, check marks
+    val successBright  = Color(0xFF22C55E)   // copy-confirmed flash
+    val indigo         = Color(0xFF6366F1)   // Vertex AI badge, gallery accent
+    val linkLight      = Color(0xFF2563EB)   // markdown links (light mode)
+    val linkDark       = Color(0xFF60A5FA)   // markdown links (dark mode)
+    val dropdownDark   = Color(0xFF1A2030)   // dropdown/menu bg (dark)
+    val dropdownLight  = Color(0xFFF8F9FB)   // dropdown/menu bg (light)
+}