diff --git a/AGENTS.md b/AGENTS.md
index 7479557..3241488 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -44,6 +44,7 @@ to the custom scripts instead of system-installed packages.
 - `auto` for obvious types (e.g. `auto main(...) -> int`)
 - **East const** (e.g. `char const*` not `const char*`)
 - **Trailing return type** for all function definitions, including operators (e.g. `auto operator=(T&&) noexcept -> T&`)
+- **Public members first** in class declarations, private members at the bottom
 - `<>` includes only for system headers (std, OS, etc.)
 - `""` includes for third-party dependencies (e.g. `fmt`, `nlohmann/json`)
 - **Naming:** `snake_case` for variables, functions, and classes
diff --git a/cbt/opengl/buffer.hpp b/cbt/opengl/buffer.hpp
index 5dbd631..5655bc9 100644
--- a/cbt/opengl/buffer.hpp
+++ b/cbt/opengl/buffer.hpp
@@ -15,9 +15,6 @@ enum class buffer_type {
 };
 
 class buffer {
-    GLuint m_id = 0;
-    buffer_type m_type = buffer_type::vertex;
-
 public:
     buffer();
     explicit buffer(buffer_type type);
@@ -36,6 +33,10 @@ public:
     auto upload_dynamic(void const* data, size_t size) -> void;
     auto id() const -> GLuint;
     auto valid() const -> bool;
+
+private:
+    GLuint m_id = 0;
+    buffer_type m_type = buffer_type::vertex;
 };
 
 }
diff --git a/cbt/opengl/context.hpp b/cbt/opengl/context.hpp
index 69b6aab..d26f744 100644
--- a/cbt/opengl/context.hpp
+++ b/cbt/opengl/context.hpp
@@ -8,14 +8,6 @@
 namespace cbt::opengl {
 
 class context {
-    GLFWwindow* m_window = nullptr;
-    bool m_initialized = false;
-
-    static auto init() -> bool;
-    static auto terminate() -> void;
-    static auto setup_gl() -> bool;
-    static auto print_info() -> void;
-
 public:
     explicit context(std::string title, int width, int height);
     ~context();
@@ -25,6 +17,15 @@ public:
     auto swap_buffers() -> void;
     auto poll_events() -> void;
     auto raw() const -> GLFWwindow*;
+
+private:
+    GLFWwindow* m_window = nullptr;
+    bool m_initialized = false;
+
+    static auto init() -> bool;
+    static auto terminate() -> void;
+    static auto setup_gl() -> bool;
+    static auto print_info() -> void;
 };
 
 }
diff --git a/cbt/opengl/descriptor.hpp b/cbt/opengl/descriptor.hpp
index b380154..f147247 100644
--- a/cbt/opengl/descriptor.hpp
+++ b/cbt/opengl/descriptor.hpp
@@ -16,14 +16,15 @@ struct descriptor_binding {
 };
 
 class descriptor_set {
-    std::vector<descriptor_binding> m_bindings;
-
 public:
     descriptor_set();
     auto add_texture(texture tex, GLuint unit = 0) -> void;
     auto add_buffer(buffer buf, GLuint unit = 0) -> void;
     auto bind_all() -> void;
     auto count() const -> size_t;
+
+private:
+    std::vector<descriptor_binding> m_bindings;
 };
 
 }
diff --git a/cbt/opengl/shader.hpp b/cbt/opengl/shader.hpp
index 5864a5a..cd9db0b 100644
--- a/cbt/opengl/shader.hpp
+++ b/cbt/opengl/shader.hpp
@@ -7,8 +7,6 @@
 namespace cbt::opengl {
 
 class shader {
-    GLuint m_id = 0;
-
 public:
     shader();
     ~shader();
@@ -26,6 +24,9 @@ public:
     auto unuse() const -> void;
     auto id() const -> GLuint;
     auto valid() const -> bool;
+
+private:
+    GLuint m_id = 0;
 };
 
 }
diff --git a/cbt/opengl/texture.hpp b/cbt/opengl/texture.hpp
index 6329074..e10a7e8 100644
--- a/cbt/opengl/texture.hpp
+++ b/cbt/opengl/texture.hpp
@@ -30,9 +30,6 @@ enum class texture_type {
 };
 
 class texture {
-    GLuint m_id = 0;
-    texture_target m_target = texture_target::_2d;
-
 public:
     texture();
     explicit texture(texture_target target);
@@ -52,6 +49,10 @@ public:
     auto generate_mipmaps() -> void;
     auto id() const -> GLuint;
     auto valid() const -> bool;
+
+private:
+    GLuint m_id = 0;
+    texture_target m_target = texture_target::_2d;
 };
 
 }
diff --git a/cbt/opengl/vao.hpp b/cbt/opengl/vao.hpp
index ca07609..838d166 100644
--- a/cbt/opengl/vao.hpp
+++ b/cbt/opengl/vao.hpp
@@ -5,8 +5,6 @@
 namespace cbt::opengl {
 
 class vao {
-    GLuint m_id = 0;
-
 public:
     vao();
     ~vao();
@@ -21,6 +19,9 @@ public:
     auto unbind() const -> void;
     auto id() const -> GLuint;
     auto valid() const -> bool;
+
+private:
+    GLuint m_id = 0;
 };
 
 }
diff --git a/scenes/cube.hpp b/scenes/cube.hpp
index 8884087..66069d9 100644
--- a/scenes/cube.hpp
+++ b/scenes/cube.hpp
@@ -11,6 +11,13 @@
 namespace cbt::scenes {
 
 class cube final : public scene {
+public:
+    cube();
+    auto init() -> bool override;
+    auto update(float delta_time) -> void override;
+    auto render() -> void override;
+
+private:
     opengl::shader m_prog;
     opengl::buffer m_vbo;
     opengl::vao m_vao;
@@ -23,12 +30,6 @@ class cube final : public scene {
 
     auto build_mesh() -> void;
     auto build_shader() -> bool;
-
-public:
-    cube();
-    auto init() -> bool override;
-    auto update(float delta_time) -> void override;
-    auto render() -> void override;
 };
 
 }