diff --git a/frontend/src/components/CommandLine.tsx b/frontend/src/components/CommandLine.tsx
new file mode 100644
index 0000000..019bd8f
--- /dev/null
+++ b/frontend/src/components/CommandLine.tsx
@@ -0,0 +1,108 @@
+import React, { useState, useRef, useEffect } from 'react';
+import './CommandLine.css';
+
+const CommandLine: React.FC = () => {
+  const [command, setCommand] = useState('');
+  const [suggestions, setSuggestions] = useState<string[]>([]);
+  const inputRef = useRef<HTMLInputElement>(null);
+  
+  // Mock command suggestions
+  const commandList = [
+    'LINE', 'CIRCLE', 'RECTANGLE', 'POLYGON',
+    'MOVE', 'COPY', 'ROTATE', 'SCALE',
+    'TRIM', 'EXTEND', 'FILLET', 'CHAMFER',
+    'DIMLINEAR', 'DIMALIGNED', 'DIMRADIUS', 'DIMDIAMETER',
+    'TEXT', 'MTEXT', 'INSERT', 'HATCH'
+  ];
+
+  useEffect(() => {
+    // Focus the input when component mounts
+    if (inputRef.current) {
+      inputRef.current.focus();
+    }
+  }, []);
+
+  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const value = e.target.value;
+    setCommand(value);
+    
+    // Generate suggestions based on input
+    if (value.length > 0) {
+      const filtered = commandList.filter(cmd => 
+        cmd.toLowerCase().startsWith(value.toLowerCase())
+      );
+      setSuggestions(filtered);
+    } else {
+      setSuggestions([]);
+    }
+  };
+
+  const handleSuggestionClick = (suggestion: string) => {
+    setCommand(suggestion);
+    setSuggestions([]);
+    // Focus back to input after selection
+    if (inputRef.current) {
+      inputRef.current.focus();
+    }
+  };
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    // In a real app, this would dispatch the command
+    console.log('Command submitted:', command);
+    setCommand('');
+    setSuggestions([]);
+  };
+
+  return (
+    <div className="command-line" role="region" aria-label="Command Line">
+      <form onSubmit={handleSubmit} className="command-form">
+        <label htmlFor="command-input" className="command-label">
+          Command:
+        </label>
+        <div className="command-input-container">
+          <input
+            ref={inputRef}
+            id="command-input"
+            type="text"
+            value={command}
+            onChange={handleInputChange}
+            className="command-input"
+            aria-autocomplete="list"
+            aria-controls="command-suggestions"
+            aria-describedby="command-description"
+            placeholder="Enter command..."
+          />
+          <button type="submit" className="command-submit">
+            Enter
+          </button>
+        </div>
+        <div id="command-description" className="sr-only">
+          Type a CAD command and press Enter to execute
+        </div>
+        {suggestions.length > 0 && (
+          <ul 
+            id="command-suggestions" 
+            className="suggestions-list" 
+            role="listbox"
+            aria-label="Command Suggestions"
+          >
+            {suggestions.map((suggestion, index) => (
+              <li 
+                key={index}
+                className="suggestion-item"
+                onClick={() => handleSuggestionClick(suggestion)}
+                role="option"
+                aria-selected="false"
+              >
+                {suggestion}
+              </li>
+            ))}
+          </ul>
+        )}
+      </form>
+    </div>
+  );
+};
+
+export default CommandLine;
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