diff --git a/config.py b/config.py
new file mode 100644
index 0000000..93b26a9
--- /dev/null
+++ b/config.py
@@ -0,0 +1,13 @@
+"""Application configuration."""
+
+# ── Budget ────────────────────────────────────────────────────────────
+BUDGET_S = 3600  # default 60 min in seconds
+
+# ── Timer ─────────────────────────────────────────────────────────────
+TICK_INTERVAL = 10  # seconds between budget check cycles
+
+# ── Allowed device hours (curfew) ─────────────────────────────────────
+ALLOWED_WEEKDAY_START = 15   # Mon-Fri start hour
+ALLOWED_WEEKDAY_END = 20     # Mon-Fri end hour
+ALLOWED_WEEKEND_START = 8    # Sat-Sun start hour
+ALLOWED_END_MINUTE = 30      # End minute (all days)
diff --git a/devices.py b/devices.py
index 862dc5c..a1427a4 100644
--- a/devices.py
+++ b/devices.py
@@ -1,23 +1,20 @@
 """Device management: check status, power off, and budget tracking."""
 
 import json
-import os
 import subprocess
 import threading
 from datetime import datetime, timedelta
 from pathlib import Path
 
-# ── Config ────────────────────────────────────────────────────────────
+import config
 
-BUDGET_SECONDS = int(os.environ.get("BUDGET_MINUTES", "60")) * 60  # default 60 min in seconds
+BUDGET_S = config.BUDGET_S
 STATE_FILE = Path(__file__).parent / ".device_state.json"
-TICK_INTERVAL = 10  # seconds between budget checks
-
-# Allowed device hours (24h format)
-ALLOWED_WEEKDAY_START = int(os.environ.get("ALLOWED_WEEKDAY_START", "15"))   # Mon-Fri start hour
-ALLOWED_WEEKDAY_END = int(os.environ.get("ALLOWED_WEEKDAY_END", "20"))       # Mon-Fri end hour
-ALLOWED_WEEKEND_START = int(os.environ.get("ALLOWED_WEEKEND_START", "8"))    # Sat-Sun start hour
-ALLOWED_END_MINUTE = int(os.environ.get("ALLOWED_END_MINUTE", "30"))         # End minute (same for all days)
+TICK_INTERVAL = config.TICK_INTERVAL
+ALLOWED_WEEKDAY_START = config.ALLOWED_WEEKDAY_START
+ALLOWED_WEEKDAY_END = config.ALLOWED_WEEKDAY_END
+ALLOWED_WEEKEND_START = config.ALLOWED_WEEKEND_START
+ALLOWED_END_MINUTE = config.ALLOWED_END_MINUTE
 
 
 # ── Budget state (persisted to disk) ─────────────────────────────────
@@ -148,20 +145,20 @@ DEVICES = {
 def _get_budget(device: str) -> int:
     """Get remaining budget in seconds."""
     state = _load_state()
-    return state.get(device, {}).get("budget", BUDGET_SECONDS)
+    return state.get(device, {}).get("budget", BUDGET_S)
 
 
 def _set_budget(device: str, budget_seconds: int):
     state = _load_state()
     if device not in state:
-        state[device] = {"budget": BUDGET_SECONDS}
+        state[device] = {"budget": BUDGET_S}
     state[device]["budget"] = budget_seconds
     state[device]["last_online"] = datetime.now().isoformat()
     _save_state(state)
 
 
 def _reset_budget(device: str):
-    _set_budget(device, BUDGET_SECONDS)
+    _set_budget(device, BUDGET_S)
 
 
 def _budget_to_minutes(budget_seconds: int) -> int:
@@ -280,7 +277,7 @@ def _budget_tick():
     with _timer_lock:
         for dev_id, dev_info in DEVICES.items():
             state = _load_state()
-            current_budget = state.get(dev_id, {}).get("budget", BUDGET_SECONDS)
+            current_budget = state.get(dev_id, {}).get("budget", BUDGET_S)
 
             is_online = dev_info["check"]()
             if isinstance(is_online, dict):
@@ -351,7 +348,7 @@ def status_all() -> list[dict]:
     actions = []
     for dev_id, dev_info in DEVICES.items():
         state = _load_state()
-        budget_seconds = state.get(dev_id, {}).get("budget", BUDGET_SECONDS)
+        budget_seconds = state.get(dev_id, {}).get("budget", BUDGET_S)
 
         is_online = dev_info["check"]()
         if isinstance(is_online, dict):
diff --git a/server.py b/server.py
index 6fd1b8a..4157070 100755
--- a/server.py
+++ b/server.py
@@ -4,7 +4,8 @@
 import json
 from http.server import HTTPServer, BaseHTTPRequestHandler
 
-from devices import shutdown_all, status_all, curfew_status, _set_budget, _get_budget, BUDGET_SECONDS, TICK_INTERVAL
+import config
+from devices import shutdown_all, status_all, curfew_status, _set_budget, _get_budget
 
 
 class Handler(BaseHTTPRequestHandler):
@@ -47,7 +48,7 @@ class Handler(BaseHTTPRequestHandler):
                 dev_id = data.get("device", "")
                 delta = int(data.get("delta", 0))
                 current = _get_budget(dev_id)
-                new_budget = max(0, min(BUDGET_SECONDS, current + delta))
+                new_budget = max(0, min(config.BUDGET_S, current + delta))
                 _set_budget(dev_id, new_budget)
                 self.send_response(200)
                 self.send_header("Content-Type", "application/json")
@@ -242,7 +243,7 @@ if __name__ == "__main__":
     start_timer()
     server = HTTPServer(("0.0.0.0", port), Handler)
     print(f"🚀 Open http://localhost:{port}")
-    print(f"⏱️  Budget timer running (checks every {TICK_INTERVAL}s, reset at 7:00 AM)")
+    print(f"⏱️  Budget timer running (checks every {config.TICK_INTERVAL}s, reset at 7:00 AM)")
     try:
         server.serve_forever()
     except KeyboardInterrupt: