moved code here. still needs to update gh

terrarium_bk/terrarium/main.c

@@ -0,0 +1,57 @@
+/*
+ * main.c - Entry point of the Terrarium program
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+#include <stdlib.h>   /* for system() */
+#include <unistd.h>   /* for usleep() */
+
+#include "game.h"
+
+int main(void) {
+    GameState gs;
+
+    /* Load a previous save or start fresh. */
+    loadGame(&gs);
+
+    /* Setup terminal for non-blocking input, no echo */
+    initTermios(0);
+
+    int running = 1;
+    while (running) {
+        /* Time since the last loop in seconds */
+        double elapsedSeconds = getElapsedTime();
+
+        /* Update game logic (oxygen accumulation, etc.) */
+        updateGame(&gs, elapsedSeconds);
+
+        /* Render the shelves and the info area */
+        renderGame(&gs);
+
+        /* Check user input (non-blocking) */
+        if (kbhit()) {
+            char c = getch();
+            if (c == 'q' || c == 'Q') {
+                running = 0;  /* quit */
+            } else {
+                handleInput(&gs, c);
+            }
+        }
+
+        /* Control frame/tick rate (~5 times a second) */
+        usleep(GAME_TICK_INTERVAL_MS * 1000);
+
+        /* Auto-save each loop (optional) */
+        saveGame(&gs);
+    }
+
+    /* Cleanup */
+    resetTermios();
+    clearScreen();
+    printf("Thanks for playing Terrarium!\n");
+
+    return 0;
+}
+