diff --git a/today-s-sound/Core/AppState/AppThemeManager.swift b/today-s-sound/Core/AppState/AppThemeManager.swift
index 396aac8..ad692e0 100644
--- a/today-s-sound/Core/AppState/AppThemeManager.swift
+++ b/today-s-sound/Core/AppState/AppThemeManager.swift
@@ -31,8 +31,8 @@ final class AppThemeManager: ObservableObject {
     {
       self.theme = theme
     } else {
-      // 기본값은 일반 모드
-      theme = .normal
+      // 기본값은 고대비 모드
+      theme = .highContrast
     }
   }
 
diff --git a/today-s-sound/Core/Auth/UserCredentialsProvider.swift b/today-s-sound/Core/Auth/UserCredentialsProvider.swift
index daacca3..dc88ae8 100644
--- a/today-s-sound/Core/Auth/UserCredentialsProvider.swift
+++ b/today-s-sound/Core/Auth/UserCredentialsProvider.swift
@@ -12,10 +12,10 @@ import Foundation
 protocol UserCredentialsProvider {
   /// 사용자 ID를 반환
   func getUserId() -> String?
-  
+
   /// 디바이스 시크릿을 반환
   func getDeviceSecret() -> String?
-  
+
   /// 사용자 ID와 디바이스 시크릿을 튜플로 반환
   /// 둘 다 존재할 때만 반환, 없으면 nil
   func getCredentials() -> (userId: String, deviceSecret: String)?
@@ -26,11 +26,11 @@ final class KeychainCredentialsProvider: UserCredentialsProvider {
   func getUserId() -> String? {
     Keychain.getString(for: KeychainKey.userId)
   }
-  
+
   func getDeviceSecret() -> String? {
     Keychain.getString(for: KeychainKey.deviceSecret)
   }
-  
+
   func getCredentials() -> (userId: String, deviceSecret: String)? {
     guard let userId = Keychain.getString(for: KeychainKey.userId),
           let deviceSecret = Keychain.getString(for: KeychainKey.deviceSecret)
@@ -46,22 +46,22 @@ final class KeychainCredentialsProvider: UserCredentialsProvider {
   final class MockCredentialsProvider: UserCredentialsProvider {
     var userId: String?
     var deviceSecret: String?
-    
+
     init(userId: String? = "test-user-id", deviceSecret: String? = "test-device-secret") {
       self.userId = userId
       self.deviceSecret = deviceSecret
     }
-    
+
     func getUserId() -> String? {
       userId
     }
-    
+
     func getDeviceSecret() -> String? {
       deviceSecret
     }
-    
+
     func getCredentials() -> (userId: String, deviceSecret: String)? {
-      guard let userId = userId, let deviceSecret = deviceSecret else {
+      guard let userId, let deviceSecret else {
         return nil
       }
       return (userId, deviceSecret)
diff --git a/today-s-sound/Core/Error/ErrorHandler.swift b/today-s-sound/Core/Error/ErrorHandler.swift
index 6d6eeea..0112068 100644
--- a/today-s-sound/Core/Error/ErrorHandler.swift
+++ b/today-s-sound/Core/Error/ErrorHandler.swift
@@ -8,23 +8,23 @@
 import Foundation
 
 /// 네트워크 에러를 사용자 친화적인 메시지로 변환하는 유틸리티
-struct ErrorHandler {
+enum ErrorHandler {
   /// NetworkError를 사용자에게 표시할 메시지로 변환
   static func userFacingMessage(from error: NetworkError) -> String {
     switch error {
     case let .serverError(statusCode):
-      return "서버 오류 (상태: \(statusCode))"
+      "서버 오류 (상태: \(statusCode))"
     case .decodingFailed:
-      return "응답 처리 실패"
+      "응답 처리 실패"
     case let .requestFailed(requestError):
-      return "요청 실패: \(requestError.localizedDescription)"
+      "요청 실패: \(requestError.localizedDescription)"
     case .invalidURL:
-      return "잘못된 URL"
+      "잘못된 URL"
     case .unknown:
-      return "알 수 없는 오류"
+      "알 수 없는 오류"
     }
   }
-  
+
   /// 에러를 로깅하고 사용자 메시지 반환
   static func handleError(_ error: NetworkError, context: String = "") -> String {
     let message = userFacingMessage(from: error)
diff --git a/today-s-sound/Core/Network/Config.swift b/today-s-sound/Core/Network/Config.swift
index e8931d6..4c3f90e 100644
--- a/today-s-sound/Core/Network/Config.swift
+++ b/today-s-sound/Core/Network/Config.swift
@@ -3,8 +3,8 @@ import Foundation
 enum Config {
   static var baseURL: String {
     #if DEBUG
-//      return "https://www.today-sound.com"
-      return "http://localhost:8080" // 개발 서버
+      return "https://www.today-sound.com"
+    // return "http://localhost:8080" // 개발 서버
     #else
       return "https://api.todays-sound.com" // 운영 서버
     #endif
diff --git a/today-s-sound/Core/Pagination/PaginationState.swift b/today-s-sound/Core/Pagination/PaginationState.swift
index 9f6a60d..a83119c 100644
--- a/today-s-sound/Core/Pagination/PaginationState.swift
+++ b/today-s-sound/Core/Pagination/PaginationState.swift
@@ -13,27 +13,27 @@ final class PaginationState {
   private(set) var currentPage: Int = 0
   private(set) var hasMoreData: Bool = true
   let pageSize: Int
-  
+
   init(pageSize: Int = 10) {
     self.pageSize = pageSize
   }
-  
+
   /// 다음 페이지로 이동
   func moveToNextPage() {
     currentPage += 1
   }
-  
+
   /// 받은 데이터 개수를 기반으로 더 이상 데이터가 있는지 확인
   func updateHasMoreData(receivedCount: Int) {
     hasMoreData = receivedCount >= pageSize
   }
-  
+
   /// 페이지네이션 상태 초기화 (새로고침 시 사용)
   func reset() {
     currentPage = 0
     hasMoreData = true
   }
-  
+
   /// 첫 페이지인지 확인
   var isFirstPage: Bool {
     currentPage == 0
diff --git a/today-s-sound/Presentation/Base/Component/ScreenMainTitle.swift b/today-s-sound/Presentation/Base/Component/ScreenMainTitle.swift
index 00c0ee0..ba790ce 100644
--- a/today-s-sound/Presentation/Base/Component/ScreenMainTitle.swift
+++ b/today-s-sound/Presentation/Base/Component/ScreenMainTitle.swift
@@ -14,7 +14,7 @@ struct ScreenMainTitle: View {
 
   var body: some View {
     Text(text)
-      .font(.KoddiBold48)
+      .font(.KoddiBold56)
       .foregroundColor(Color.text(theme))
       .frame(maxWidth: .infinity, alignment: .center)
       .multilineTextAlignment(.center)
diff --git a/today-s-sound/Presentation/Features/AddSubscription/AddSubscriptionView.swift b/today-s-sound/Presentation/Features/AddSubscription/AddSubscriptionView.swift
index adb5049..9b498f4 100644
--- a/today-s-sound/Presentation/Features/AddSubscription/AddSubscriptionView.swift
+++ b/today-s-sound/Presentation/Features/AddSubscription/AddSubscriptionView.swift
@@ -399,5 +399,6 @@ struct FlowLayout: Layout {
 struct AddSubscriptionView_Previews: PreviewProvider {
   static var previews: some View {
     AddSubscriptionView()
+      .environmentObject(AppThemeManager())
   }
 }
diff --git a/today-s-sound/Presentation/Features/Main/Home/HomeView.swift b/today-s-sound/Presentation/Features/Main/Home/HomeView.swift
index 8fd8285..ac38051 100644
--- a/today-s-sound/Presentation/Features/Main/Home/HomeView.swift
+++ b/today-s-sound/Presentation/Features/Main/Home/HomeView.swift
@@ -16,8 +16,8 @@ struct HomeView: View {
         Text("오늘의 소리")
           .font(.KoddiBold56)
           .foregroundStyle(Color.text(appTheme.theme))
-          .padding(.top, 60)
-          .padding(.bottom, 30)
+          .padding(.top, 120)
+          .padding(.bottom, 60)
           .accessibilityElement() // 이 텍스트를 독립 요소로
           .accessibilityLabel("오늘의 소리") // 👉 "오늘의 소리"라고 읽기
           .accessibilityAddTraits(.isHeader) // 머리말(헤더)로 인식
@@ -112,4 +112,5 @@ struct HomeView: View {
 
 #Preview {
   HomeView()
+    .environmentObject(AppThemeManager())
 }
diff --git a/today-s-sound/Presentation/Features/Main/MainView.swift b/today-s-sound/Presentation/Features/Main/MainView.swift
index 98ce685..f70f484 100644
--- a/today-s-sound/Presentation/Features/Main/MainView.swift
+++ b/today-s-sound/Presentation/Features/Main/MainView.swift
@@ -1,63 +1,91 @@
 import SwiftUI
 
+private struct TabBarForegroundUpdater: UIViewControllerRepresentable {
+  let theme: AppTheme
+
+  func makeUIViewController(context: Context) -> UIViewController {
+    let vc = UIViewController()
+    vc.view.backgroundColor = .clear
+    return vc
+  }
+
+  func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
+    guard let tabBar = uiViewController.tabBarController?.tabBar else { return }
+
+    let selectedColor = UIColor(Color.primaryGreen)
+
+    let unselectedColor: UIColor = (theme == .highContrast)
+      ? UIColor(white: 1.0, alpha: 0.85)
+      : UIColor(Color.primaryGrey)
+
+    tabBar.tintColor = selectedColor
+    tabBar.unselectedItemTintColor = unselectedColor
+
+    tabBar.items?.forEach { item in
+      item.setTitleTextAttributes([.foregroundColor: unselectedColor], for: .normal)
+      item.setTitleTextAttributes([.foregroundColor: selectedColor], for: .selected)
+
+      item.image = item.image?.withRenderingMode(.alwaysTemplate)
+      item.selectedImage = item.selectedImage?.withRenderingMode(.alwaysTemplate)
+    }
+  }
+}
+
 struct MainView: View {
   private enum Tab: Hashable {
-    case home
-    case feed
-    case notifications
-    case settings
+    case home, feed, notifications, settings
   }
 
   @State private var selectedTab: Tab = .home
+  @EnvironmentObject private var appTheme: AppThemeManager
 
   var body: some View {
+    let theme = appTheme.theme
+
     TabView(selection: $selectedTab) {
       HomeView()
-        .tabItem {
-          VStack {
-            Image(systemName: "play.house.fill")
-              .accessibilityHidden(true) // 아이콘은 숨기고
-            Text("홈") // 이름만 읽히게
-          }
-        }
+        .tabItem { Label("홈", systemImage: "play.house.fill") }
         .tag(Tab.home)
 
       FeedView()
-        .tabItem {
-          VStack {
-            Image(systemName: "text.bubble.fill")
-              .accessibilityHidden(true)
-            Text("피드")
-          }
-        }
+        .tabItem { Label("피드", systemImage: "text.bubble.fill") }
         .tag(Tab.feed)
 
       NotificationListView()
-        .tabItem {
-          VStack {
-            Image(systemName: "bell.fill")
-              .accessibilityHidden(true)
-            Text("알림")
-          }
-        }
+        .tabItem { Label("알림", systemImage: "bell.fill") }
         .tag(Tab.notifications)
 
       SettingsView()
-        .tabItem {
-          VStack {
-            Image(systemName: "gearshape.fill")
-              .accessibilityHidden(true)
-            Text("관리")
-          }
-        }
+        .tabItem { Label("관리", systemImage: "gearshape.fill") }
         .tag(Tab.settings)
     }
-    .tint(.primaryGreen)
+    .tint(Color.primaryGreen)
+    .background(TabBarForegroundUpdater(theme: theme).frame(width: 0, height: 0))
   }
 }
 
 struct MainView_Previews: PreviewProvider {
+  private static var normalThemeManager: AppThemeManager {
+    let m = AppThemeManager()
+    m.theme = .normal
+    return m
+  }
+
+  private static var highContrastThemeManager: AppThemeManager {
+    let m = AppThemeManager()
+    m.theme = .highContrast
+    return m
+  }
+
   static var previews: some View {
-    MainView()
+    Group {
+      MainView()
+        .environmentObject(normalThemeManager)
+        .previewDisplayName("Theme: Normal")
+
+      MainView()
+        .environmentObject(highContrastThemeManager)
+        .previewDisplayName("Theme: HighContrast")
+    }
   }
 }
diff --git a/today-s-sound/Presentation/Features/NotificationList/NotificationListView.swift b/today-s-sound/Presentation/Features/NotificationList/NotificationListView.swift
index 42b5058..3acf125 100644
--- a/today-s-sound/Presentation/Features/NotificationList/NotificationListView.swift
+++ b/today-s-sound/Presentation/Features/NotificationList/NotificationListView.swift
@@ -67,19 +67,20 @@ struct NotificationListView: View {
     // 알림 없음
     else if viewModel.alarms.isEmpty {
       Spacer()
-      VStack(spacing: 16) {
+      VStack(spacing: 0) {
         Text("새로운 알림이 없습니다")
           .font(.KoddiBold20)
           .foregroundColor(Color.secondaryText(appTheme.theme))
           .accessibilityLabel("새로운 알림이 없습니다")
       }
+      .padding(.top, 28)
       Spacer()
     }
     // 알림 목록
     else {
       List {
         ForEach(viewModel.alarms) { alarm in
-            AlertCardView(alarm: alarm, theme: appTheme.theme)
+          AlertCardView(alarm: alarm, theme: appTheme.theme)
             .listRowInsets(EdgeInsets(top: 0, leading: 20, bottom: 12, trailing: 20))
             .listRowSeparator(.hidden)
             .listRowBackground(Color.clear)
@@ -119,23 +120,19 @@ struct NotificationListView: View {
       Group {
         // 데이터 있는 상태 - 라이트 모드
         NotificationListView(viewModel: .previewData)
-          .environment(\.colorScheme, .light)
-          .previewDisplayName("알림 목록 - Light")
+          .environmentObject(AppThemeManager()).previewDisplayName("알림 목록 - Light")
 
         // 데이터 있는 상태 - 다크 모드
         NotificationListView(viewModel: .previewData)
-          .environment(\.colorScheme, .dark)
-          .previewDisplayName("알림 목록 - Dark")
+          .environmentObject(AppThemeManager()).previewDisplayName("알림 목록 - Dark")
 
         // 빈 상태
         NotificationListView(viewModel: .previewEmpty)
-          .environment(\.colorScheme, .light)
-          .previewDisplayName("알림 없음")
+          .environmentObject(AppThemeManager()).previewDisplayName("알림 없음")
 
         // 에러 상태
         NotificationListView(viewModel: .previewError)
-          .environment(\.colorScheme, .light)
-          .previewDisplayName("에러 상태")
+          .environmentObject(AppThemeManager()).previewDisplayName("에러 상태")
       }
     }
   }
diff --git a/today-s-sound/Presentation/Features/Practice/ButtonPracticeView.swift b/today-s-sound/Presentation/Features/Practice/ButtonPracticeView.swift
deleted file mode 100644
index 88babd5..0000000
--- a/today-s-sound/Presentation/Features/Practice/ButtonPracticeView.swift
+++ /dev/null
@@ -1,266 +0,0 @@
-//
-//  ButtonPracticeView.swift
-//  today-s-sound
-//
-//  Button 스타일링 연습용 뷰
-//
-
-import SwiftUI
-
-struct ButtonPracticeView: View {
-  @State private var count = 0
-  @State private var isEnabled = true
-  @EnvironmentObject var appTheme: AppThemeManager
-
-  var body: some View {
-    ScrollView {
-      VStack(spacing: 30) {
-        // 제목
-        Text("Button 스타일링 연습")
-          .font(.KoddiBold28)
-          .foregroundColor(Color.text(appTheme.theme))
-          .padding(.top, 20)
-
-        // ============================================
-        // 1. 기본 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("1. 기본 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("클릭하세요") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .padding()
-          .background(Color.primaryGreen)
-          .cornerRadius(8)
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 2. 아이콘 + 텍스트 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("2. 아이콘 + 텍스트 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button(action: {
-            count += 1
-          }) {
-            HStack {
-              Image(systemName: "plus.circle.fill")
-              Text("증가")
-            }
-            .font(.KoddiBold18)
-            .foregroundColor(.white)
-            .padding()
-            .background(Color.primaryGreen)
-            .cornerRadius(8)
-          }
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 3. 전체 너비 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("3. 전체 너비 Button (maxWidth: .infinity)")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("전체 너비 버튼") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .frame(maxWidth: .infinity) // 👈 이게 핵심!
-          .padding(.vertical, 16)
-          .background(Color.primaryGreen)
-          .cornerRadius(8)
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 4. 둥근 모서리 배경 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("4. RoundedRectangle 배경")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("둥근 모서리") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .frame(maxWidth: .infinity)
-          .padding(.vertical, 16)
-          .background(
-            RoundedRectangle(cornerRadius: 12)
-              .fill(Color.primaryGreen)
-          )
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 5. 테두리 있는 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("5. 테두리 있는 Button (overlay)")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("테두리 버튼") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(Color.primaryGreen)
-          .frame(maxWidth: .infinity)
-          .padding(.vertical, 16)
-          .background(Color.background(appTheme.theme))
-          .overlay(
-            RoundedRectangle(cornerRadius: 8)
-              .stroke(Color.primaryGreen, lineWidth: 2)
-          )
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 6. 비활성화 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("6. 비활성화 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("비활성화 버튼") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .frame(maxWidth: .infinity)
-          .padding(.vertical, 16)
-          .background(
-            isEnabled ? Color.primaryGreen : Color.primaryGreen.opacity(0.4)
-          )
-          .cornerRadius(8)
-          .disabled(!isEnabled)
-
-          Toggle("버튼 활성화", isOn: $isEnabled)
-            .font(.KoddiRegular16)
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 7. 원형 Button (Circle)
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("7. 원형 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button(action: {
-            count += 1
-          }) {
-            Image(systemName: "play.fill")
-              .font(.system(size: 24))
-              .foregroundColor(.white)
-              .frame(width: 80, height: 80)
-              .background(
-                Circle()
-                  .fill(Color.primaryGreen)
-              )
-          }
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 8. 그림자 있는 Button
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("8. 그림자 있는 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("그림자 버튼") {
-            count += 1
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .frame(maxWidth: .infinity)
-          .padding(.vertical, 16)
-          .background(Color.primaryGreen)
-          .cornerRadius(8)
-          .shadow(color: .black.opacity(0.2), radius: 5, x: 0, y: 2)
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 9. 프로젝트 스타일 Button (AddSubscriptionButton 참고)
-        // ============================================
-        VStack(alignment: .leading, spacing: 10) {
-          Text("9. 프로젝트 스타일 Button")
-            .font(.KoddiBold20)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button(action: {
-            count += 1
-          }) {
-            Text("등록 승인 요청")
-              .font(.KoddiExtraBold32)
-              .foregroundColor(.white)
-              .frame(maxWidth: .infinity)
-              .frame(height: 82)
-              .background(
-                RoundedRectangle(cornerRadius: 12)
-                  .fill(Color.primaryGreen)
-              )
-          }
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.horizontal, 20)
-
-        // ============================================
-        // 10. 카운터 표시
-        // ============================================
-        VStack(spacing: 10) {
-          Text("버튼 클릭 횟수: \(count)")
-            .font(.KoddiBold24)
-            .foregroundColor(Color.text(appTheme.theme))
-
-          Button("리셋") {
-            count = 0
-          }
-          .font(.KoddiBold18)
-          .foregroundColor(.white)
-          .padding(.horizontal, 30)
-          .padding(.vertical, 12)
-          .background(Color.urgentPink)
-          .cornerRadius(8)
-        }
-        .padding(.vertical, 20)
-      }
-    }
-    .background(Color.background(appTheme.theme))
-  }
-}
-
-// MARK: - Preview
-
-#Preview {
-  ButtonPracticeView()
-    .environmentObject(AppThemeManager())
-}
-
diff --git a/today-s-sound/Presentation/Features/Settings/ContactDeveloperView.swift b/today-s-sound/Presentation/Features/Settings/ContactDeveloperView.swift
index 261445a..9f01c09 100644
--- a/today-s-sound/Presentation/Features/Settings/ContactDeveloperView.swift
+++ b/today-s-sound/Presentation/Features/Settings/ContactDeveloperView.swift
@@ -12,9 +12,6 @@ struct ContactDeveloperView: View {
         .ignoresSafeArea()
 
       VStack(spacing: 0) {
-        ScreenMainTitle(text: "개발자 문의", theme: appTheme.theme)
-          .padding(.top, 16)
-
         Spacer()
 
         VStack(spacing: 24) {
@@ -33,7 +30,7 @@ struct ContactDeveloperView: View {
 
           // 이메일 주소 버튼
           Button {
-            if let url = URL(string: "mailto:support@todayssound.com?subject=문의사항") {
+            if let url = URL(string: "mailto:todaysound.official@gmail.com?subject=문의사항") {
               UIApplication.shared.open(url)
             }
           } label: {
@@ -41,12 +38,12 @@ struct ContactDeveloperView: View {
               Image(systemName: "envelope")
                 .font(.KoddiBold20)
                 .foregroundColor(Color.primaryGreen)
-              Text("support@todayssound.com")
+              Text("todaysound.official@gmail.com")
                 .font(.KoddiBold20)
                 .foregroundColor(Color.primaryGreen)
             }
             .frame(maxWidth: .infinity)
-            .padding(.horizontal, 24)
+            .padding(.horizontal, 8)
             .padding(.vertical, 16)
             .overlay(
               RoundedRectangle(cornerRadius: 8)
@@ -84,6 +81,7 @@ struct ContactDeveloperView_Previews: PreviewProvider {
   static var previews: some View {
     NavigationView {
       ContactDeveloperView()
+        .environmentObject(AppThemeManager())
     }
   }
 }
diff --git a/today-s-sound/Presentation/Features/Settings/PlaybackSettingsView.swift b/today-s-sound/Presentation/Features/Settings/PlaybackSettingsView.swift
index d3d7152..d2aef3b 100644
--- a/today-s-sound/Presentation/Features/Settings/PlaybackSettingsView.swift
+++ b/today-s-sound/Presentation/Features/Settings/PlaybackSettingsView.swift
@@ -11,9 +11,6 @@ struct PlaybackSettingsView: View {
         .ignoresSafeArea()
 
       VStack(spacing: 0) {
-        ScreenMainTitle(text: "재생 설정", theme: appTheme.theme)
-          .padding(.top, 16)
-
         // 재생 속도 설정
         VStack(alignment: .leading, spacing: 16) {
           Text("재생 속도 설정")
@@ -134,6 +131,7 @@ struct PlaybackSettingsView_Previews: PreviewProvider {
   static var previews: some View {
     NavigationView {
       PlaybackSettingsView()
+        .environmentObject(AppThemeManager())
     }
   }
 }
diff --git a/today-s-sound/Presentation/Features/Settings/SettingsView.swift b/today-s-sound/Presentation/Features/Settings/SettingsView.swift
index c02483b..c5c9306 100644
--- a/today-s-sound/Presentation/Features/Settings/SettingsView.swift
+++ b/today-s-sound/Presentation/Features/Settings/SettingsView.swift
@@ -13,42 +13,62 @@ struct SettingsView: View {
 
         VStack(spacing: 0) {
           ScreenMainTitle(text: "관리", theme: appTheme.theme)
-            .padding(.top, 16)
+            .padding(.bottom, 16)
+            .accessibilityAddTraits(.isHeader)
+            .accessibilityLabel("관리 화면")
 
-          Spacer()
-
-          // 관리 항목 리스트
           VStack(spacing: 0) {
-            NavigationLink(destination: SubscriptionListView()) {
-              SettingsRow(title: "구독 페이지 관리", theme: appTheme.theme)
+            NavigationLink(
+              destination: BackHeaderContainer(title: "구독 관리", theme: appTheme.theme) {
+                SubscriptionListView()
+              }
+            ) {
+              SettingsRow(title: "구독 페이지 관리 및 추가", theme: appTheme.theme)
             }
             .buttonStyle(PlainButtonStyle())
+            .accessibilityLabel("구독 페이지 관리 및 추가")
+            .accessibilityHint("탭하면 구독 페이지 관리 및 추가 화면으로 이동합니다")
 
             Divider()
               .background(Color.border(appTheme.theme))
-              .padding(.horizontal, 20)
-
-            NavigationLink(destination: PlaybackSettingsView()) {
+              .padding(.horizontal, 4)
+              .accessibilityHidden(true)
+
+            NavigationLink(
+              destination: BackHeaderContainer(title: "재생 설정", theme: appTheme.theme) {
+                PlaybackSettingsView()
+              }
+            ) {
               SettingsRow(title: "재생 설정", theme: appTheme.theme)
             }
             .buttonStyle(PlainButtonStyle())
+            .accessibilityLabel("재생 설정")
+            .accessibilityHint("탭하면 재생 설정 화면으로 이동합니다")
 
             Divider()
               .background(Color.border(appTheme.theme))
-              .padding(.horizontal, 20)
-
-            NavigationLink(destination: ContactDeveloperView()) {
+              .padding(.horizontal, 4)
+              .accessibilityHidden(true)
+
+            NavigationLink(
+              destination: BackHeaderContainer(title: "개발자 문의", theme: appTheme.theme) {
+                ContactDeveloperView()
+              }
+            ) {
               SettingsRow(title: "개발자에게 문의", theme: appTheme.theme)
             }
             .buttonStyle(PlainButtonStyle())
+            .accessibilityLabel("개발자에게 문의")
+            .accessibilityHint("탭하면 개발자 문의 화면으로 이동합니다")
 
             Divider()
               .background(Color.border(appTheme.theme))
-              .padding(.horizontal, 20)
+              .padding(.horizontal, 4)
+              .accessibilityHidden(true)
 
             HStack {
               Text("고대비 모드 설정")
-                .font(.KoddiBold24)
+                .font(.KoddiBold28)
                 .foregroundColor(Color.text(appTheme.theme))
               Spacer()
               Toggle("", isOn: Binding(
@@ -67,25 +87,25 @@ struct SettingsView: View {
           }
           .background(Color.background(appTheme.theme))
           .cornerRadius(12)
-          .padding(.horizontal, 20)
+          .padding(.horizontal, 8)
           .padding(.bottom, 40)
+          .accessibilityElement(children: .contain)
 
-          // 앱 초기화 버튼
           Button {
             showDeleteAlert = true
           } label: {
             Text("앱 초기화")
-              .font(.KoddiBold20)
+              .font(.KoddiExtraBold32)
               .foregroundColor(.white)
               .frame(maxWidth: .infinity)
               .padding(.vertical, 16)
               .background(Color.urgentPink)
               .cornerRadius(8)
           }
-          .padding(.horizontal, 20)
+          .padding(.horizontal, 8)
           .padding(.bottom, 40)
-          .accessibilityLabel("앱 초기화 버튼")
-          .accessibilityHint("탭하여 앱을 초기화합니다")
+          .accessibilityLabel("앱 초기화")
+          .accessibilityHint("탭하면 앱 초기화 확인 창이 열립니다")
 
           Spacer()
         }
@@ -93,17 +113,81 @@ struct SettingsView: View {
       .navigationBarHidden(true)
       .alert("앱 초기화", isPresented: $showDeleteAlert) {
         Button("취소", role: .cancel) {}
+          .accessibilityLabel("취소")
+
         Button("초기화하기", role: .destructive) {
           session.logout()
-          // 앱 종료
-          DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
-            exit(0)
-          }
+          DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { exit(0) }
         }
+        .accessibilityLabel("초기화하기")
+        .accessibilityHint("모든 데이터를 삭제하고 앱을 종료합니다")
       } message: {
-        Text("정말 앱을 초기화하시겠습니까?\n모든 데이터가 삭제되고 앱이 종료됩니다.")
+        Text("정말 앱을 초기화하시겠습니까? 모든 데이터가 삭제되고 앱이 종료됩니다.")
+      }
+    }
+  }
+}
+
+// MARK: - 목적지 화면용 커스텀 헤더 래퍼
+
+private struct BackHeaderContainer<Content: View>: View {
+  @Environment(\.dismiss) private var dismiss
+
+  let title: String
+  let theme: AppTheme
+  let content: Content
+
+  init(title: String, theme: AppTheme, @ViewBuilder content: () -> Content) {
+    self.title = title
+    self.theme = theme
+    self.content = content()
+  }
+
+  var body: some View {
+    ZStack(alignment: .top) {
+      Color.background(theme)
+        .ignoresSafeArea()
+
+      VStack(spacing: 0) {
+        header
+        content
+          .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
+      }
+    }
+    .navigationBarHidden(true)
+    .accessibilityHint("이전 화면으로 돌아가려면 왼쪽 상단의 뒤로가기 버튼을 탭하세요. 보이스오버 사용 중에는 두 손가락으로 Z 모양으로 쓸면 뒤로 갈 수 있습니다.")
+  }
+
+  private var header: some View {
+    ZStack {
+      // 가운데 고정 타이틀
+      Text(title)
+        .font(.KoddiBold56)
+        .foregroundColor(Color.text(theme))
+        .lineLimit(1)
+        .truncationMode(.tail)
+        .frame(maxWidth: .infinity, alignment: .center)
+        .padding(.horizontal, 30) // ← 좌/우 버튼 영역만큼 항상 확보
+        .accessibilityAddTraits(.isHeader)
+
+      // 왼쪽 고정 뒤로 버튼
+      HStack {
+        Button {
+          dismiss()
+        } label: {
+          Image(systemName: "chevron.left")
+            .font(.system(size: 20, weight: .semibold))
+            .foregroundColor(Color.text(theme))
+            .frame(width: 44, height: 44)
+        }
+        .accessibilityLabel("뒤로가기")
+        .accessibilityHint("탭하면 이전 화면으로 돌아갑니다")
+
+        Spacer()
       }
     }
+    .padding(.horizontal, 16)
+    .padding(.vertical, 8)
   }
 }
 
@@ -116,12 +200,12 @@ struct SettingsRow: View {
   var body: some View {
     HStack {
       Text(title)
-        .font(.KoddiBold24)
+        .font(.KoddiBold28)
         .foregroundColor(Color.text(theme))
       Spacer()
     }
     .padding(.horizontal, 20)
-    .padding(.vertical, 16)
+    .padding(.vertical, 24)
     .contentShape(Rectangle())
   }
 }
@@ -130,5 +214,6 @@ struct SettingsView_Previews: PreviewProvider {
   static var previews: some View {
     SettingsView()
       .environmentObject(SessionStore.preview)
+      .environmentObject(AppThemeManager())
   }
 }
diff --git a/today-s-sound/Presentation/Features/SubscriptionList/Component/SubscriptionCardView.swift b/today-s-sound/Presentation/Features/SubscriptionList/Component/SubscriptionCardView.swift
index cbdf7cc..e5a9658 100644
--- a/today-s-sound/Presentation/Features/SubscriptionList/Component/SubscriptionCardView.swift
+++ b/today-s-sound/Presentation/Features/SubscriptionList/Component/SubscriptionCardView.swift
@@ -11,6 +11,17 @@ struct SubscriptionCardView: View {
   let subscription: SubscriptionItem
   let theme: AppTheme
   var onToggleAlarm: ((SubscriptionItem) -> Void)?
+  private var resolvedTextColor: Color {
+    theme == .highContrast ? .white : Color.primaryGrey
+  }
+
+  private var resolvedCardBackgroundColor: Color {
+    theme == .highContrast ? Color(white: 0.12) : Color.greyBackground
+  }
+
+  private var resolvedBorderColor: Color {
+    theme == .highContrast ? Color(white: 0.25) : Color.borderGrey
+  }
 
   var body: some View {
     HStack(spacing: 12) {
@@ -18,13 +29,13 @@ struct SubscriptionCardView: View {
         // 구독 이름 (alias)
         Text(subscription.alias)
           .font(.KoddiBold20)
-          .foregroundColor(Color.primaryGrey)
+          .foregroundColor(resolvedTextColor)
           .accessibilityLabel("구독 페이지 이름: \(subscription.alias)")
 
         // URL
         Text(subscription.url)
           .font(.KoddiRegular16)
-          .foregroundColor(Color.primaryGrey)
+          .foregroundColor(resolvedTextColor)
           .lineLimit(1)
           .accessibilityLabel("주소: \(subscription.url)")
 
@@ -63,10 +74,10 @@ struct SubscriptionCardView: View {
     .padding(16)
     .background(
       RoundedRectangle(cornerRadius: 8)
-        .fill(Color.greyBackground)
+        .fill(resolvedCardBackgroundColor)
         .overlay(
           RoundedRectangle(cornerRadius: 8)
-            .stroke(Color.borderGrey, lineWidth: 1)
+            .stroke(resolvedBorderColor, lineWidth: 1)
         )
     )
   }
@@ -94,6 +105,7 @@ struct SubscriptionCardView_Previews: PreviewProvider {
       )
       .padding()
       .previewDisplayName("Normal")
+      .environmentObject(AppThemeManager())
 
       SubscriptionCardView(
         subscription: sampleSubscription,
@@ -102,6 +114,7 @@ struct SubscriptionCardView_Previews: PreviewProvider {
       .padding()
       .previewDisplayName("High Contrast")
       .background(Color.black)
+      .environmentObject(AppThemeManager())
     }
     .previewLayout(.sizeThatFits)
   }
diff --git a/today-s-sound/Presentation/Features/SubscriptionList/SubscriptionListView.swift b/today-s-sound/Presentation/Features/SubscriptionList/SubscriptionListView.swift
index 13b6c0b..c42b6cc 100644
--- a/today-s-sound/Presentation/Features/SubscriptionList/SubscriptionListView.swift
+++ b/today-s-sound/Presentation/Features/SubscriptionList/SubscriptionListView.swift
@@ -15,8 +15,7 @@ struct SubscriptionListView: View {
       Color.background(appTheme.theme)
         .ignoresSafeArea()
 
-      VStack(spacing: 12) {
-        ScreenMainTitle(text: "구독 페이지 관리", theme: appTheme.theme)
+      VStack {
         ScreenSubTitle(text: "구독 중인 페이지", theme: appTheme.theme)
           .padding(.top, 16)
 
@@ -33,7 +32,7 @@ struct SubscriptionListView: View {
         // 에러 메시지
         else if let errorMessage = viewModel.errorMessage {
           Spacer()
-          VStack(spacing: 16) {
+          VStack {
             Text(errorMessage)
               .font(.KoddiBold20)
               .foregroundColor(Color.secondaryText(appTheme.theme))
@@ -157,6 +156,7 @@ struct SubscriptionListView: View {
     }
     .sheet(isPresented: $showAddSubscription) {
       AddSubscriptionView()
+        .environmentObject(AppThemeManager())
     }
   }
 }
@@ -166,15 +166,19 @@ struct SubscriptionListView_Previews: PreviewProvider {
     Group {
       SubscriptionListView(viewModel: .previewLoading)
         .previewDisplayName("Loading")
+        .environmentObject(AppThemeManager())
 
       SubscriptionListView(viewModel: .previewError)
         .previewDisplayName("Error")
+        .environmentObject(AppThemeManager())
 
       SubscriptionListView(viewModel: .previewEmpty)
         .previewDisplayName("Empty")
+        .environmentObject(AppThemeManager())
 
       SubscriptionListView(viewModel: .previewData)
         .previewDisplayName("With Data")
+        .environmentObject(AppThemeManager())
     }
   }
 }