Remove keyboard shortcuts - always show UI panels and auto-follow

Changes:
1. Remove all keyboard shortcuts (B, I, F keys)
2. UI panels always shown (body list, info, simulation info)
3. Selecting a body automatically enables camera follow
4. render_info() now uses GuiWindowBox style matching other UI

UI improvements:
- render_info() now uses GuiWindowBox for consistent styling
- Positioned at bottom-left with smaller window (200x280)
- Window close buttons disabled (panels always shown)
- Updated help text to reflect new workflow

User experience:
- Simpler interaction - just select body from list to follow it
- All information always visible
- Consistent UI styling across all panels

src/main.cpp

@@ -38,8 +38,6 @@ void run_gui_simulation(SimulationState* sim) {
 
     // Initialize UI state
     render_state.selected_body_index = -1;  // No selection initially
-    render_state.show_body_list = false;
-    render_state.show_body_info = false;
     render_state.body_list_scroll = 0;     // Initial scroll position
     render_state.body_list_active = -1;    // No active item initially
     render_state.camera_follow_body = false; // Camera not following initially
@@ -55,9 +53,7 @@ void run_gui_simulation(SimulationState* sim) {
     printf("  Arrow keys: Rotate and zoom camera\n");
     printf("  Space: Pause/Resume\n");
     printf("  +/-: Speed up/slow down simulation\n");
-    printf("  I: Toggle info display\n");
+    printf("  Select body from list to follow it\n");
-    printf("  B: Toggle body list\n");
-    printf("  F: Toggle camera follow on selected body\n");
     printf("  ESC: Quit\n\n");
 
     while (!WindowShouldClose()) {

src/renderer.cpp

@@ -32,7 +32,6 @@ void setup_camera(RenderState* render_state) {
     // Set scaling factors (same scale for distances and sizes)
     render_state->distance_scale = 1e-9;  // Meters to scaled units (1 unit = 1 billion meters)
     render_state->size_scale = 1e-9;      // Same scale for body sizes (minimum size still applies)
-    render_state->show_info = true;
 }
 
 // Update camera with keyboard/mouse controls
@@ -137,26 +136,6 @@ void update_camera(RenderState* render_state, SimulationState* sim) {
         }
     }
 
-    // Toggle info display with I key
-    if (IsKeyPressed(KEY_I)) {
-        render_state->show_info = !render_state->show_info;
-    }
-
-    // Toggle body list with B key
-    if (IsKeyPressed(KEY_B)) {
-        render_state->show_body_list = !render_state->show_body_list;
-    }
-
-    // Toggle camera follow with F key
-    if (IsKeyPressed(KEY_F)) {
-        if (render_state->selected_body_index >= 0) {
-            render_state->camera_follow_body = !render_state->camera_follow_body;
-            printf("Camera follow: %s\n", render_state->camera_follow_body ? "enabled" : "disabled");
-        } else {
-            render_state->camera_follow_body = false;
-        }
-    }
-
     // Store previous follow state
     render_state->was_following_body = render_state->camera_follow_body;
 }
@@ -398,12 +377,8 @@ void render_simulation(SimulationState* sim, RenderState* render_state) {
 
     EndMode3D();
 
-    // Render 2D info overlay
+    // Render UI panels (always shown)
-    if (render_state->show_info) {
     render_info(sim, "solar_system.txt");
-    }
-
-    // Render UI panels
     render_body_list_ui(sim, render_state);
     render_body_info_ui(sim, render_state);
 
@@ -412,40 +387,59 @@ void render_simulation(SimulationState* sim, RenderState* render_state) {
 
 // Render simulation information overlay
 void render_info(SimulationState* sim, const char* config_name) {
-    DrawText("Orbital Mechanics Simulation", 10, 10, 20, WHITE);
+    // Panel dimensions
+    int panel_width = 200;
+    int panel_height = 280;
+    int panel_x = 10;
+    int panel_y = GetScreenHeight() - panel_height - 10;
 
-    char buffer[256];
+    Rectangle panel_bounds = { (float)panel_x, (float)panel_y, (float)panel_width, (float)panel_height };
+
+    // Draw window
+    if (GuiWindowBox(panel_bounds, "Info")) {
+        // Window box close button doesn't close this panel
+    }
+
+    // Prepare info text
+    char info_text[1024];
+    char temp_buffer[256];
+    int offset = 0;
+
+    snprintf(info_text, sizeof(info_text), "Orbital Mechanics Simulation\n\n");
 
     // Simulation time (in days)
     double days = sim->time / 86400.0;  // seconds to days
-    snprintf(buffer, sizeof(buffer), "Time: %.2f days", days);
+    snprintf(temp_buffer, sizeof(temp_buffer), "Time: %.2f days\n", days);
-    DrawText(buffer, 10, 40, 16, LIGHTGRAY);
+    strcat(info_text, temp_buffer);
 
     // Body count
-    snprintf(buffer, sizeof(buffer), "Bodies: %d", sim->body_count);
+    snprintf(temp_buffer, sizeof(temp_buffer), "Bodies: %d\n", sim->body_count);
-    DrawText(buffer, 10, 60, 16, LIGHTGRAY);
+    strcat(info_text, temp_buffer);
-
-    // Config name
-    snprintf(buffer, sizeof(buffer), "Config: %s", config_name);
-    DrawText(buffer, 10, 80, 16, LIGHTGRAY);
 
     // FPS
-    snprintf(buffer, sizeof(buffer), "FPS: %d", GetFPS());
+    snprintf(temp_buffer, sizeof(temp_buffer), "FPS: %d\n\n", GetFPS());
-    DrawText(buffer, 10, 100, 16, LIGHTGRAY);
+    strcat(info_text, temp_buffer);
 
     // Controls
-    DrawText("Controls:", 10, 130, 16, YELLOW);
+    strcat(info_text, "Controls:\n");
-    DrawText("  Arrows: Rotate/Zoom camera", 10, 150, 14, LIGHTGRAY);
+    strcat(info_text, "  Arrows: Rotate/Zoom\n");
-    DrawText("  Space: Pause/Resume", 10, 170, 14, LIGHTGRAY);
+    strcat(info_text, "  Space: Pause/Resume\n");
-    DrawText("  +/-: Speed up/slow down", 10, 190, 14, LIGHTGRAY);
+    strcat(info_text, "  +/-: Speed control\n");
-    DrawText("  I: Toggle info", 10, 210, 14, LIGHTGRAY);
+    strcat(info_text, "  ESC: Quit\n");
-    DrawText("  ESC: Quit", 10, 230, 14, LIGHTGRAY);
+
+    // Draw info text (inside window, leave space for title bar)
+    Rectangle text_bounds = {
+        (float)panel_x + 8,
+        (float)panel_y + 25,
+        (float)panel_width - 16,
+        (float)panel_height - 29
+    };
+
+    GuiLabel(text_bounds, info_text);
 }
 
 // Render body list UI panel
 void render_body_list_ui(SimulationState* sim, RenderState* render_state) {
-    if (!render_state->show_body_list) return;
-
     // Panel dimensions
     int panel_width = 200;
     int panel_height = 400;
@@ -469,10 +463,8 @@ void render_body_list_ui(SimulationState* sim, RenderState* render_state) {
         offset += snprintf(body_list_text + offset, buffer_size - offset, "%s", sim->bodies[i].name);
     }
 
-    // Draw window
+    // Draw window (no close button - panels always shown)
-    if (GuiWindowBox(panel_bounds, "Bodies")) {
+    GuiWindowBox(panel_bounds, "Bodies");
-        render_state->show_body_list = false;
-    }
 
     // Draw list view (inside window, leave space for title bar)
     Rectangle list_bounds = {
@@ -489,7 +481,9 @@ void render_body_list_ui(SimulationState* sim, RenderState* render_state) {
     if (render_state->body_list_active >= 0 && render_state->body_list_active < sim->body_count &&
         render_state->body_list_active != previous_active) {
         render_state->selected_body_index = render_state->body_list_active;
-        render_state->show_body_info = true;
+        // Enable camera follow when body is selected
+        render_state->camera_follow_body = true;
+        printf("Camera follow enabled for: %s\n", sim->bodies[render_state->selected_body_index].name);
     }
 
     free(body_list_text);
@@ -497,8 +491,17 @@ void render_body_list_ui(SimulationState* sim, RenderState* render_state) {
 
 // Render body information UI panel
 void render_body_info_ui(SimulationState* sim, RenderState* render_state) {
-    if (!render_state->show_body_info || render_state->selected_body_index < 0 ||
+    if (render_state->selected_body_index < 0 || render_state->selected_body_index >= sim->body_count) {
-        render_state->selected_body_index >= sim->body_count) return;
+        // No body selected - render empty panel
+        int panel_width = 250;
+        int panel_height = 300;
+        int panel_x = GetScreenWidth() - panel_width - 10;
+        int panel_y = 10;
+
+        Rectangle panel_bounds = { (float)panel_x, (float)panel_y, (float)panel_width, (float)panel_height };
+        GuiWindowBox(panel_bounds, "Info");
+        return;
+    }
 
     // Panel dimensions
     int panel_width = 250;
@@ -510,10 +513,8 @@ void render_body_info_ui(SimulationState* sim, RenderState* render_state) {
 
     CelestialBody* body = &sim->bodies[render_state->selected_body_index];
 
-    // Draw window
+    // Draw window (no close button - panels always shown)
-    if (GuiWindowBox(panel_bounds, body->name)) {
+    GuiWindowBox(panel_bounds, body->name);
-        render_state->show_body_info = false;
-    }
 
     // Prepare info text
     char info_text[1024];

src/renderer.h

@@ -9,10 +9,7 @@ struct RenderState {
     Camera3D camera;
     double distance_scale;    // Scale factor for distances
     double size_scale;        // Scale factor for body sizes
-    bool show_info;           // Display simulation info
     int selected_body_index;  // -1 = no selection
-    bool show_body_list;      // Toggle for list panel
-    bool show_body_info;      // Toggle for info panel
     int body_list_scroll;     // Scroll position for body list
     int body_list_active;     // Active item index in body list
     bool camera_follow_body;  // Whether camera follows selected body