import os

def search_markdown_files(directory, keyword):
    results = []
    for filename in os.listdir(directory):
        if filename.endswith(".md"):
            filepath = os.path.join(directory, filename)
            with open(filepath, "r", encoding="utf-8") as f:
                lines = f.readlines()
                for i, line in enumerate(lines):
                    if keyword.lower() in line.lower():
                        results.append({
                            "filename": filename,
                            "line": i + 1,
                            "text": line.strip()
                        })
    return results