Add Apple-inspired Flat Design style

generate_report.py

@@ -27,7 +27,7 @@ from styles import get_theme_css, get_theme_config
 SCRIPT_DIR = Path(__file__).parent
 
 # Modern styles that use the unified template
-MODERN_STYLES = ["brutalism", "glassmorphism", "neumorphism", "material"]
+MODERN_STYLES = ["brutalism", "glassmorphism", "neumorphism", "material", "flat"]
 
 
 def load_template(template_file: str) -> str:
@@ -225,9 +225,9 @@ def main():
     )
     parser.add_argument(
         "--style",
-        choices=["brutalism", "glassmorphism", "neumorphism", "material"],
+        choices=["brutalism", "glassmorphism", "neumorphism", "material", "flat"],
         default=None,
-        help="Modern style to use (brutalism, glassmorphism, neumorphism, material). Overrides --template."
+        help="Modern style to use (brutalism, glassmorphism, neumorphism, material, flat). Overrides --template."
     )
 
     args = parser.parse_args()