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include/components/common.hpp

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+/**
+ * @file common.hpp
+ * @brief Common/utility components
+ */
+
+#pragma once
+
+#include <string>
+
+struct Name {
+    std::string value;
+};
+
+// Tag component - empty struct marks entities for destruction
+struct ToDestroy {};
+
+struct Lifetime {
+    float remaining = 0.0f;
+};
+
+struct Health {
+    float current = 100.0f;
+    float max = 100.0f;
+};

include/components/input.hpp

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+/**
+ * @file input.hpp
+ * @brief Input-related components
+ */
+
+#pragma once
+
+struct PlayerControlled {
+    int player_id = 0;
+};
+
+struct InputState {
+    bool move_up = false;
+    bool move_down = false;
+    bool move_left = false;
+    bool move_right = false;
+    bool action_primary = false;
+    bool action_secondary = false;
+    float mouse_x = 0.0f;
+    float mouse_y = 0.0f;
+};

include/components/render.hpp

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+/**
+ * @file render.hpp
+ * @brief Rendering-related components
+ */
+
+#pragma once
+
+#include <SDL3/SDL.h>
+#include <cstdint>
+
+struct Color {
+    uint8_t r = 255;
+    uint8_t g = 255;
+    uint8_t b = 255;
+    uint8_t a = 255;
+};
+
+struct Sprite {
+    SDL_Texture* texture = nullptr;
+    SDL_FRect src_rect{};
+    int z_order = 0;
+    bool visible = true;
+};
+
+struct RectShape {
+    float width = 0.0f;
+    float height = 0.0f;
+};
+
+struct CircleShape {
+    float radius = 0.0f;
+};

include/components/transform.hpp

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+/**
+ * @file transform.hpp
+ * @brief Transform components for position, velocity, and rotation
+ */
+
+#pragma once
+
+struct Position {
+  float x = 0.0f;
+  float y = 0.0f;
+};
+
+struct Velocity {
+  float x = 0.0f;
+  float y = 0.0f;
+};
+
+struct Rotation {
+  float angle = 0.0f;
+};
+
+struct Scale {
+  float x = 1.0f;
+  float y = 1.0f;
+};