diff --git a/src/main.cpp b/src/main.cpp
index a8d094f..9083830 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -51,6 +51,110 @@ static void setup_menus(PlatformWindow *window)
     platform_set_menu(window, menus, sizeof(menus) / sizeof(menus[0]));
 }
 
+static void setup_theme()
+{
+    ImGuiIO &io = ImGui::GetIO();
+
+    // Load Segoe UI from Windows system fonts
+    ImFontConfig font_cfg = {};
+    font_cfg.OversampleH = 2;
+    font_cfg.OversampleV = 1;
+    font_cfg.PixelSnapH  = true;
+    io.Fonts->AddFontFromFileTTF("C:\\Windows\\Fonts\\segoeui.ttf", 15.0f, &font_cfg);
+
+    // DAW-style dark theme
+    ImGuiStyle &s = ImGui::GetStyle();
+
+    // Geometry
+    s.WindowPadding     = ImVec2(8, 8);
+    s.FramePadding      = ImVec2(6, 4);
+    s.ItemSpacing       = ImVec2(8, 4);
+    s.ItemInnerSpacing  = ImVec2(4, 4);
+    s.ScrollbarSize     = 12.0f;
+    s.GrabMinSize       = 8.0f;
+    s.WindowBorderSize  = 1.0f;
+    s.FrameBorderSize   = 0.0f;
+    s.TabBorderSize     = 0.0f;
+    s.WindowRounding    = 2.0f;
+    s.FrameRounding     = 2.0f;
+    s.GrabRounding      = 2.0f;
+    s.TabRounding       = 2.0f;
+    s.ScrollbarRounding = 2.0f;
+
+    ImVec4 *c = s.Colors;
+
+    // Backgrounds
+    c[ImGuiCol_WindowBg]            = ImVec4(0.12f, 0.12f, 0.13f, 1.00f);
+    c[ImGuiCol_ChildBg]             = ImVec4(0.12f, 0.12f, 0.13f, 1.00f);
+    c[ImGuiCol_PopupBg]             = ImVec4(0.15f, 0.15f, 0.16f, 1.00f);
+
+    // Borders
+    c[ImGuiCol_Border]              = ImVec4(0.22f, 0.22f, 0.24f, 1.00f);
+    c[ImGuiCol_BorderShadow]        = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+
+    // Text
+    c[ImGuiCol_Text]                = ImVec4(0.88f, 0.88f, 0.88f, 1.00f);
+    c[ImGuiCol_TextDisabled]        = ImVec4(0.44f, 0.44f, 0.44f, 1.00f);
+
+    // Headers (collapsing headers, menu bar items)
+    c[ImGuiCol_Header]              = ImVec4(0.20f, 0.20f, 0.22f, 1.00f);
+    c[ImGuiCol_HeaderHovered]       = ImVec4(0.28f, 0.28f, 0.30f, 1.00f);
+    c[ImGuiCol_HeaderActive]        = ImVec4(0.24f, 0.24f, 0.26f, 1.00f);
+
+    // Buttons
+    c[ImGuiCol_Button]              = ImVec4(0.22f, 0.22f, 0.24f, 1.00f);
+    c[ImGuiCol_ButtonHovered]       = ImVec4(0.30f, 0.30f, 0.33f, 1.00f);
+    c[ImGuiCol_ButtonActive]        = ImVec4(0.26f, 0.26f, 0.28f, 1.00f);
+
+    // Frame backgrounds (inputs, checkboxes, sliders)
+    c[ImGuiCol_FrameBg]             = ImVec4(0.16f, 0.16f, 0.17f, 1.00f);
+    c[ImGuiCol_FrameBgHovered]      = ImVec4(0.20f, 0.20f, 0.22f, 1.00f);
+    c[ImGuiCol_FrameBgActive]       = ImVec4(0.18f, 0.18f, 0.20f, 1.00f);
+
+    // Tabs
+    c[ImGuiCol_Tab]                 = ImVec4(0.16f, 0.16f, 0.17f, 1.00f);
+    c[ImGuiCol_TabHovered]          = ImVec4(0.28f, 0.28f, 0.30f, 1.00f);
+    c[ImGuiCol_TabSelected]         = ImVec4(0.20f, 0.20f, 0.22f, 1.00f);
+    c[ImGuiCol_TabSelectedOverline] = ImVec4(0.34f, 0.54f, 0.69f, 1.00f);
+    c[ImGuiCol_TabDimmed]           = ImVec4(0.12f, 0.12f, 0.13f, 1.00f);
+    c[ImGuiCol_TabDimmedSelected]   = ImVec4(0.16f, 0.16f, 0.17f, 1.00f);
+
+    // Title bar
+    c[ImGuiCol_TitleBg]             = ImVec4(0.10f, 0.10f, 0.11f, 1.00f);
+    c[ImGuiCol_TitleBgActive]       = ImVec4(0.13f, 0.13f, 0.14f, 1.00f);
+    c[ImGuiCol_TitleBgCollapsed]    = ImVec4(0.10f, 0.10f, 0.11f, 1.00f);
+
+    // Scrollbar
+    c[ImGuiCol_ScrollbarBg]         = ImVec4(0.10f, 0.10f, 0.11f, 1.00f);
+    c[ImGuiCol_ScrollbarGrab]       = ImVec4(0.24f, 0.24f, 0.26f, 1.00f);
+    c[ImGuiCol_ScrollbarGrabHovered]= ImVec4(0.30f, 0.30f, 0.33f, 1.00f);
+    c[ImGuiCol_ScrollbarGrabActive] = ImVec4(0.34f, 0.34f, 0.37f, 1.00f);
+
+    // Slider grab
+    c[ImGuiCol_SliderGrab]          = ImVec4(0.34f, 0.54f, 0.69f, 1.00f);
+    c[ImGuiCol_SliderGrabActive]    = ImVec4(0.40f, 0.60f, 0.75f, 1.00f);
+
+    // Checkmark, accent
+    c[ImGuiCol_CheckMark]           = ImVec4(0.34f, 0.54f, 0.69f, 1.00f);
+
+    // Separator
+    c[ImGuiCol_Separator]           = ImVec4(0.22f, 0.22f, 0.24f, 1.00f);
+    c[ImGuiCol_SeparatorHovered]    = ImVec4(0.34f, 0.54f, 0.69f, 1.00f);
+    c[ImGuiCol_SeparatorActive]     = ImVec4(0.34f, 0.54f, 0.69f, 1.00f);
+
+    // Resize grip
+    c[ImGuiCol_ResizeGrip]          = ImVec4(0.22f, 0.22f, 0.24f, 0.50f);
+    c[ImGuiCol_ResizeGripHovered]   = ImVec4(0.34f, 0.54f, 0.69f, 0.67f);
+    c[ImGuiCol_ResizeGripActive]    = ImVec4(0.34f, 0.54f, 0.69f, 0.95f);
+
+    // Docking
+    c[ImGuiCol_DockingPreview]      = ImVec4(0.34f, 0.54f, 0.69f, 0.70f);
+    c[ImGuiCol_DockingEmptyBg]      = ImVec4(0.10f, 0.10f, 0.11f, 1.00f);
+
+    // Menu bar
+    c[ImGuiCol_MenuBarBg]           = ImVec4(0.14f, 0.14f, 0.15f, 1.00f);
+}
+
 static void build_default_layout(ImGuiID dockspace_id)
 {
     ImGui::DockBuilderRemoveNode(dockspace_id);
@@ -93,6 +197,7 @@ int main(int argc, char **argv)
         return 1;
     }
 
+    setup_theme();
     setup_menus(window);
 
     int32_t last_w = w, last_h = h;