feat: 다운로드 창 다크 테마 적용

- 배경 #2E2C2F, 타이틀 #BACDB0(강조색), 상태 텍스트 밝은 회색
- WM_CTLCOLORSTATIC으로 STATIC 컨트롤 색상 제어
- SetWindowTheme + PBM_SETBARCOLOR로 진행 막대 색상 변경
- "A301" 타이틀 레이블(13pt bold) + 상태 레이블(9pt) 분리
- 웹사이트 색상 팔레트와 통일

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.go

@@ -34,6 +34,7 @@ const (
 	wmClose          uint32 = 0x0010
 	wmSetFont        uint32 = 0x0030
 	wmSetText        uint32 = 0x000C
+	wmCtlColorStatic uint32 = 0x0138
 	wmAppDone        uint32 = 0x8001
 
 	wsPopup   uintptr = 0x80000000
@@ -46,6 +47,10 @@ const (
 	pbsSmooth      uintptr = 0x01
 	pbmSetRange32  uint32  = 0x0406
 	pbmSetPos      uint32  = 0x0402
+	pbmSetBarColor uint32  = 0x0409
+	pbmSetBkColor  uint32  = 0x2001
+
+	setBkModeTransparent = 1
 
 	swShow     = 5
 	smCxScreen = 0
@@ -59,7 +64,19 @@ const (
 	idYes           = 6
 
 	iccProgressClass uint32 = 0x00000020
-	logpixelsX               = 88
+)
+
+// rgb builds a COLORREF from R, G, B components.
+func rgb(r, g, b uint8) uintptr {
+	return uintptr(r) | (uintptr(g) << 8) | (uintptr(b) << 16)
+}
+
+// 웹사이트 색상과 동일한 팔레트
+var (
+	colorBg         = rgb(46, 44, 47)   // #2E2C2F
+	colorText       = rgb(200, 200, 200) // 밝은 회색
+	colorAccent     = rgb(186, 205, 176) // #BACDB0
+	colorProgressBg = rgb(65, 63, 67)   // bg보다 약간 밝은 색
 )
 
 var (
@@ -68,6 +85,7 @@ var (
 	gdi32    = windows.NewLazySystemDLL("gdi32.dll")
 	shell32  = windows.NewLazySystemDLL("shell32.dll")
 	comctl32 = windows.NewLazySystemDLL("comctl32.dll")
+	uxtheme  = windows.NewLazySystemDLL("uxtheme.dll")
 
 	messageBoxWProc                   = user32.NewProc("MessageBoxW")
 	registerClassExWProc              = user32.NewProc("RegisterClassExW")
@@ -88,12 +106,18 @@ var (
 	shellExecuteWProc                 = shell32.NewProc("ShellExecuteW")
 	getModuleHandleWProc              = kernel32.NewProc("GetModuleHandleW")
 	createFontIndirectWProc           = gdi32.NewProc("CreateFontIndirectW")
+	createSolidBrushProc              = gdi32.NewProc("CreateSolidBrush")
+	setTextColorProc                  = gdi32.NewProc("SetTextColor")
+	setBkModeProc                     = gdi32.NewProc("SetBkMode")
 	deleteObjectProc                  = gdi32.NewProc("DeleteObject")
 	initCommonControlsExProc          = comctl32.NewProc("InitCommonControlsEx")
+	setWindowThemeProc                = uxtheme.NewProc("SetWindowTheme")
 
 	wndProcCb         uintptr
+	titleLabelHwnd    uintptr
 	progressLabelHwnd uintptr
 	progressBarHwnd   uintptr
+	hBrushBg          uintptr
 )
 
 type wndClassExW struct {
@@ -169,10 +193,14 @@ func dpiScale(px int, dpi uint32) uintptr {
 
 // ── Font helpers ─────────────────────────────────────────────────────────────
 
-func createUIFont(pointSize int, dpi uint32) uintptr {
+func createUIFont(pointSize int, dpi uint32, bold bool) uintptr {
+	weight := int32(400) // FW_NORMAL
+	if bold {
+		weight = 700 // FW_BOLD
+	}
 	lf := logFontW{
 		lfHeight:  -int32(pointSize) * int32(dpi) / 72,
-		lfWeight:  400, // FW_NORMAL
+		lfWeight:  weight,
 		lfCharSet: 1, // DEFAULT_CHARSET
 		lfQuality: 5, // CLEARTYPE_QUALITY
 	}
@@ -219,6 +247,16 @@ func progressWndProc(hwnd, uMsg, wParam, lParam uintptr) uintptr {
 	case wmAppDone:
 		destroyWindowProc.Call(hwnd)
 		return 0
+	case wmCtlColorStatic:
+		// 다크 테마: 배경 브러시 + 텍스트 색 지정
+		hdc := wParam
+		setBkModeProc.Call(hdc, setBkModeTransparent)
+		if lParam == titleLabelHwnd {
+			setTextColorProc.Call(hdc, colorAccent)
+		} else {
+			setTextColorProc.Call(hdc, colorText)
+		}
+		return hBrushBg
 	}
 	ret, _, _ := defWindowProcWProc.Call(hwnd, uMsg, wParam, lParam)
 	return ret
@@ -234,7 +272,7 @@ func setProgress(text string, pct int) {
 	}
 }
 
-// downloadWithProgress shows a DPI-aware progress window and downloads+extracts the zip.
+// downloadWithProgress shows a DPI-aware dark-themed progress window and downloads+extracts the zip.
 // Must be called from the main goroutine (Win32 message loop requirement).
 func downloadWithProgress(downloadURL, destDir string) error {
 	runtime.LockOSThread()
@@ -244,6 +282,10 @@ func downloadWithProgress(downloadURL, destDir string) error {
 	dpi := getSystemDPI()
 	s := func(px int) uintptr { return dpiScale(px, dpi) }
 
+	// 배경 브러시 생성 (window proc에서도 사용)
+	hBrushBg, _, _ = createSolidBrushProc.Call(colorBg)
+	defer deleteObjectProc.Call(hBrushBg)
+
 	hInstance, _, _ := getModuleHandleWProc.Call(0)
 
 	className, _ := windows.UTF16PtrFromString("A301Progress")
@@ -252,55 +294,81 @@ func downloadWithProgress(downloadURL, destDir string) error {
 		lpfnWndProc:   wndProcCb,
 		hInstance:     hInstance,
 		lpszClassName: className,
-		hbrBackground: 16, // COLOR_BTNFACE+1
+		hbrBackground: hBrushBg,
 	}
 	registerClassExWProc.Call(uintptr(unsafe.Pointer(&wc)))
 
 	screenW, _, _ := getSystemMetricsProc.Call(smCxScreen)
 	screenH, _, _ := getSystemMetricsProc.Call(smCyScreen)
 	winW := s(440)
-	winH := s(130)
+	winH := s(152)
 	x := (screenW - winW) / 2
 	y := (screenH - winH) / 2
 
-	title, _ := windows.UTF16PtrFromString("A301 - 게임 설치")
+	// 창 타이틀은 비워서 타이틀바를 최소화
+	titleStr, _ := windows.UTF16PtrFromString("A301 런처")
 	hwnd, _, _ := createWindowExWProc.Call(
 		0,
 		uintptr(unsafe.Pointer(className)),
-		uintptr(unsafe.Pointer(title)),
+		uintptr(unsafe.Pointer(titleStr)),
 		wsPopup|wsCaption|wsSysMenu|wsVisible,
 		x, y, winW, winH,
 		0, 0, hInstance, 0,
 	)
 
-	font := createUIFont(9, dpi)
+	titleFont := createUIFont(13, dpi, true)
-	defer deleteObjectProc.Call(font)
+	defer deleteObjectProc.Call(titleFont)
+	statusFont := createUIFont(9, dpi, false)
+	defer deleteObjectProc.Call(statusFont)
 
-	// 상태 레이블 (텍스트)
 	staticClass, _ := windows.UTF16PtrFromString("STATIC")
+
+	// ── "A301" 타이틀 레이블 ──
+	// 클라이언트 영역 레이아웃 (base 96 DPI):
+	//   y=14  h=28  → "A301" 타이틀 (13pt bold, 강조색)
+	//   y=52  h=20  → 상태 텍스트   (9pt, 밝은 회색)
+	//   y=82  h=18  → 진행 막대
+	titleText, _ := windows.UTF16PtrFromString("A301")
+	titleLabelHwnd, _, _ = createWindowExWProc.Call(
+		0,
+		uintptr(unsafe.Pointer(staticClass)),
+		uintptr(unsafe.Pointer(titleText)),
+		wsChild|wsVisible|ssCenter,
+		s(20), s(14), winW-s(40), s(28),
+		hwnd, 0, hInstance, 0,
+	)
+	sendMessageWProc.Call(titleLabelHwnd, uintptr(wmSetFont), titleFont, 1)
+
+	// ── 상태 레이블 ──
 	initText, _ := windows.UTF16PtrFromString("게임 파일을 다운로드하는 중...")
 	progressLabelHwnd, _, _ = createWindowExWProc.Call(
 		0,
 		uintptr(unsafe.Pointer(staticClass)),
 		uintptr(unsafe.Pointer(initText)),
 		wsChild|wsVisible|ssCenter,
-		s(16), s(20), winW-s(32), s(22),
+		s(20), s(52), winW-s(40), s(20),
 		hwnd, 0, hInstance, 0,
 	)
-	sendMessageWProc.Call(progressLabelHwnd, uintptr(wmSetFont), font, 1)
+	sendMessageWProc.Call(progressLabelHwnd, uintptr(wmSetFont), statusFont, 1)
 
-	// 진행 막대
+	// ── 진행 막대 ──
 	progressClass, _ := windows.UTF16PtrFromString("msctls_progress32")
 	progressBarHwnd, _, _ = createWindowExWProc.Call(
 		0,
 		uintptr(unsafe.Pointer(progressClass)),
 		0,
 		wsChild|wsVisible|pbsSmooth,
-		s(16), s(52), winW-s(32), s(22),
+		s(20), s(82), winW-s(40), s(18),
 		hwnd, 0, hInstance, 0,
 	)
 	sendMessageWProc.Call(progressBarHwnd, uintptr(pbmSetRange32), 0, 100)
 
+	// 비주얼 스타일 비활성화 → PBM_SETBARCOLOR/PBM_SETBKCOLOR 적용 가능
+	empty, _ := windows.UTF16PtrFromString("")
+	setWindowThemeProc.Call(progressBarHwnd, uintptr(unsafe.Pointer(empty)), uintptr(unsafe.Pointer(empty)))
+	sendMessageWProc.Call(progressBarHwnd, uintptr(pbmSetBarColor), 0, colorAccent)
+	sendMessageWProc.Call(progressBarHwnd, uintptr(pbmSetBkColor), 0, colorProgressBg)
+
 	showWindowProc.Call(hwnd, swShow)
 	updateWindowProc.Call(hwnd)