diff --git a/.Jules/palette.md b/.Jules/palette.md
index 018831f..037e54b 100644
--- a/.Jules/palette.md
+++ b/.Jules/palette.md
@@ -1,3 +1,7 @@
 ## 2024-05-23 - CLI UX Enhancement
 **Learning:** Even in CLI apps, visual distinction (colors, emojis) significantly reduces cognitive load when scanning logs.
 **Action:** Use ANSI colors and consistent emojis for key events (success/failure) in future CLI tools.
+
+## 2024-05-24 - CLI Arguments & Validation
+**Learning:** CLI arguments without aliases and validation create friction and can lead to silent errors or confusing behavior.
+**Action:** Always implement shorthand aliases and input validation for CLI tools to improve discoverability and robustness.
diff --git a/__pycache__/bitcoin_trading_simulation.cpython-312.pyc b/__pycache__/bitcoin_trading_simulation.cpython-312.pyc
index 52abfc2..cbb1baa 100644
Binary files a/__pycache__/bitcoin_trading_simulation.cpython-312.pyc and b/__pycache__/bitcoin_trading_simulation.cpython-312.pyc differ
diff --git a/bitcoin_trading_simulation.py b/bitcoin_trading_simulation.py
index c86be3e..55ce56f 100644
--- a/bitcoin_trading_simulation.py
+++ b/bitcoin_trading_simulation.py
@@ -1,37 +1,35 @@
 import argparse
+import sys
 import numpy as np
 import pandas as pd
-import argparse
 
 
 class Colors:
     HEADER = '\033[95m'
     BLUE = '\033[94m'
+    CYAN = '\033[96m'
     GREEN = '\033[92m'
+    YELLOW = '\033[93m'
     RED = '\033[91m'
+    FAIL = '\033[91m'
+    WARNING = '\033[93m'
     ENDC = '\033[0m'
     BOLD = '\033[1m'
+    UNDERLINE = '\033[4m'
 
     @classmethod
     def disable(cls):
         cls.HEADER = ''
         cls.BLUE = ''
+        cls.CYAN = ''
         cls.GREEN = ''
+        cls.YELLOW = ''
         cls.RED = ''
+        cls.FAIL = ''
+        cls.WARNING = ''
         cls.ENDC = ''
         cls.BOLD = ''
-
-
-class Colors:
-    HEADER = '\033[95m'
-    BLUE = '\033[94m'
-    CYAN = '\033[96m'
-    GREEN = '\033[92m'
-    WARNING = '\033[93m'
-    FAIL = '\033[91m'
-    ENDC = '\033[0m'
-    BOLD = '\033[1m'
-    UNDERLINE = '\033[4m'
+        cls.UNDERLINE = ''
 
 def simulate_bitcoin_prices(days=60, initial_price=50000, volatility=0.02):
     """
@@ -89,7 +87,6 @@ def simulate_trading(signals, initial_cash=10000, quiet=False):
     if not quiet:
         print(f"{Colors.HEADER}{Colors.BOLD}------ Daily Trading Ledger ------{Colors.ENDC}")
 
-    print(f"\n{Colors.HEADER}{Colors.BOLD}------ Daily Trading Ledger ------{Colors.ENDC}")
     for i, row in signals.iterrows():
         if i > 0:
             portfolio.loc[i, 'cash'] = portfolio.loc[i-1, 'cash']
@@ -121,11 +118,11 @@ def simulate_trading(signals, initial_cash=10000, quiet=False):
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="Bitcoin Trading Simulation")
-    parser.add_argument("--days", type=int, default=60, help="Number of days to simulate")
-    parser.add_argument("--initial-cash", type=float, default=10000, help="Initial cash amount")
-    parser.add_argument("--initial-price", type=float, default=50000, help="Initial Bitcoin price")
-    parser.add_argument("--volatility", type=float, default=0.02, help="Price volatility")
-    parser.add_argument("--quiet", action="store_true", help="Suppress daily portfolio log")
+    parser.add_argument("--days", "-d", type=int, default=60, help="Number of days to simulate")
+    parser.add_argument("--initial-cash", "-c", type=float, default=10000, help="Initial cash amount")
+    parser.add_argument("--initial-price", "-p", type=float, default=50000, help="Initial Bitcoin price")
+    parser.add_argument("--volatility", "-v", type=float, default=0.02, help="Price volatility")
+    parser.add_argument("--quiet", "-q", action="store_true", help="Suppress daily portfolio log")
     parser.add_argument("--no-color", action="store_true", help="Disable colored output")
 
     args = parser.parse_args()
@@ -133,6 +130,20 @@ def simulate_trading(signals, initial_cash=10000, quiet=False):
     if args.no_color:
         Colors.disable()
 
+    # Input validation
+    if args.days <= 0:
+        print(f"{Colors.FAIL}Error: --days must be a positive integer.{Colors.ENDC}")
+        sys.exit(1)
+    if args.initial_cash < 0:
+        print(f"{Colors.FAIL}Error: --initial-cash must be non-negative.{Colors.ENDC}")
+        sys.exit(1)
+    if args.initial_price <= 0:
+        print(f"{Colors.FAIL}Error: --initial-price must be positive.{Colors.ENDC}")
+        sys.exit(1)
+    if args.volatility < 0:
+        print(f"{Colors.FAIL}Error: --volatility must be non-negative.{Colors.ENDC}")
+        sys.exit(1)
+
     # Simulate prices
     prices = simulate_bitcoin_prices(days=args.days, initial_price=args.initial_price, volatility=args.volatility)