diff --git a/CMakeLists.txt b/CMakeLists.txt
index 61394ae..726b071 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,8 +10,6 @@ set(SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src")
 set(INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/include")
 set(BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}")
 
-add_compile_definitions(LOG_FILE="$ENV{HOME}/${APP_NAME}-log.txt")
-
 # generate compile_commands.json for clangd
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
@@ -28,58 +26,54 @@ project(${APP_NAME}
 option(BUILD_TESTING "Build tests" OFF)
 
 add_executable(${APP_NAME}
-    ${SOURCE_DIR}/wm.c
+    ${SOURCE_DIR}/backend/output_utils.c
+    ${SOURCE_DIR}/backend/x11/backend.c
+    ${SOURCE_DIR}/backend/x11/event.c
+    ${SOURCE_DIR}/backend/x11/window.c
+
+    ${SOURCE_DIR}/base/color.c
     ${SOURCE_DIR}/base/log.c
-    ${SOURCE_DIR}/buffer.c
-    ${SOURCE_DIR}/backtrace.c
-    ${SOURCE_DIR}/monitor.c
-    ${SOURCE_DIR}/client.c
-    ${SOURCE_DIR}/text.c
-    ${SOURCE_DIR}/color.c
-    ${SOURCE_DIR}/xcursor.c
-    ${SOURCE_DIR}/xwindow.c
-    ${SOURCE_DIR}/event.c
-    ${SOURCE_DIR}/action.c
-    ${SOURCE_DIR}/xkb.c
-    ${SOURCE_DIR}/atoms.c
-    ${SOURCE_DIR}/layout.c
-    ${SOURCE_DIR}/xres.c
-    ${SOURCE_DIR}/status.c
-    ${SOURCE_DIR}/audio.c
-    ${SOURCE_DIR}/rect.c
-    ${SOURCE_DIR}/wallpaper.c
-    ${SOURCE_DIR}/config.c
-    ${SOURCE_DIR}/renderer.c
-    ${SOURCE_DIR}/image.c
-    ${SOURCE_DIR}/tray.c
+    ${SOURCE_DIR}/base/window_list.c
+
+    ${SOURCE_DIR}/config/defaults.c
+    ${SOURCE_DIR}/config/loader.c
+    ${SOURCE_DIR}/config/runtime_config.c
+
+    ${SOURCE_DIR}/core/action.c
+    ${SOURCE_DIR}/core/binding.c
+    ${SOURCE_DIR}/core/command_buffer.c
+    ${SOURCE_DIR}/core/event.c
+    ${SOURCE_DIR}/core/layer.c
+    ${SOURCE_DIR}/core/layout.c
+    ${SOURCE_DIR}/core/plan.c
+    ${SOURCE_DIR}/core/policy.c
+    ${SOURCE_DIR}/core/rules.c
+    ${SOURCE_DIR}/core/runtime.c
+    ${SOURCE_DIR}/core/state.c
+    ${SOURCE_DIR}/core/window.c
+
+    ${SOURCE_DIR}/layouts/fair.c
+    ${SOURCE_DIR}/layouts/fullscreen.c
+    ${SOURCE_DIR}/layouts/maximize.c
+
+    ${SOURCE_DIR}/main.c
 )
 
+# target_compile_definitions(${APP_NAME}
+#     PRIVATE LOG_FILE="$ENV{HOME}/${APP_NAME}-log.txt"
+# )
+
 find_package(PkgConfig REQUIRED)
 
 pkg_check_modules(deps REQUIRED
-    glib-2.0
-
-    x11
     xcb
     xcb-aux
-    xcb-cursor
     xcb-icccm
     xcb-keysyms
     xcb-randr
     xcb-xfixes
     xcb-xinerama
-    xcb-xkb
-    xcb-xrm
     xkbcommon
-    xkbcommon-x11
-
-    cairo
-    cairo-xcb
-    pango
-    pangocairo
-    imlib2
-
-    libpulse-mainloop-glib
 )
 
 target_include_directories(${APP_NAME} SYSTEM
@@ -96,53 +90,12 @@ target_link_libraries(${APP_NAME}
     PRIVATE ${deps_LIBRARIES}
 )
 
-## 配置项
-# Check for backtrace_symbols()
-include(CheckSymbolExists)
-check_symbol_exists(backtrace_symbols execinfo.h HAS_EXECINFO)
-if(NOT HAS_EXECINFO)
-    find_library(LIB_EXECINFO execinfo)
-    if(LIB_EXECINFO)
-        set(HAS_EXECINFO TRUE)
-        target_link_libraries(${APP_NAME} ${LIB_EXECINFO})
-    endif()
-endif()
-if(HAS_EXECINFO)
-    message(STATUS "checking for execinfo -- found")
-else()
-    message(STATUS "checking for execinfo -- not found")
-endif()
-
 configure_file("${SOURCE_DIR}/app.h.in"
     "${BUILD_DIR}/app.h"
     ESCAPE_QUOTES
     @ONLY
 )
 
-set(ATOM_LIST_FILE "${SOURCE_DIR}/atoms-list.txt")
-add_custom_command(
-    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build-utils/atoms-extern.sh
-    ARGS ${ATOM_LIST_FILE} > ${BUILD_DIR}/atoms-extern.h
-    OUTPUT ${BUILD_DIR}/atoms-extern.h
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-    DEPENDS ${ATOM_LIST_FILE}
-    COMMENT "Generating atoms-extern.h"
-    VERBATIM
-)
-add_custom_command(
-    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build-utils/atoms-intern.sh
-    ARGS ${ATOM_LIST_FILE} > ${BUILD_DIR}/atoms-intern.h
-    OUTPUT ${BUILD_DIR}/atoms-intern.h
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-    DEPENDS ${ATOM_LIST_FILE}
-    COMMENT "Generating atoms-intern.h"
-    VERBATIM
-)
-add_custom_target(generate_atoms
-    DEPENDS ${BUILD_DIR}/atoms-extern.h ${BUILD_DIR}/atoms-intern.h
-)
-add_dependencies(${APP_NAME} generate_atoms)
-
 if(BUILD_TESTING)
     enable_testing()
     add_subdirectory(tests)
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..bfc7c80
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,57 @@
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "base/log.h"
+#include "config/runtime_config.h"
+#include "core/backend.h"
+#include "core/runtime.h"
+
+static void bootstrap(runtime_t *runtime) {
+  auto backend = backend_create(nullptr);
+  auto detect = backend_detect(backend);
+  if (!backend || !detect || detect->output_count == 0) {
+    fatal("backend detect failed");
+  }
+
+  runtime_init_desc_t desc = {
+    .backend = backend,
+    .outputs = detect->outputs,
+    .output_count = detect->output_count,
+  };
+  if (!runtime_config_load(nullptr, &desc)) {
+    fatal("failed to build runtime inputs");
+  }
+
+  backend = nullptr;
+
+  bool inited = runtime_init(runtime, &desc);
+
+  runtime_init_desc_cleanup(&desc);
+  backend_detect_destroy(detect);
+
+  if (!inited) {
+    fatal("runtime init failed");
+  }
+}
+
+char **cmd_argv = nullptr;
+
+int main(int argc, char *argv[]) {
+  cmd_argv = argv;
+
+  runtime_t runtime = {0};
+
+  bootstrap(&runtime);
+  runtime_setup(&runtime);
+  runtime_scan(&runtime);
+  runtime_run(&runtime);
+  runtime_shutdown(&runtime);
+
+  if (runtime.will_restart) {
+    execvp(cmd_argv[0], cmd_argv);
+    fatal("execvp() failed: %s", strerror(errno));
+  }
+
+  return 0;
+}