A 54-year-old woman with no major comorbidities presents with fever, productive cough and pleuritic chest pain for 3 days. Her respiratory rate is 20 breaths/min, blood pressure 125/75 mmHg, oxygen saturation 96% on room air, and CURB-65 score is 0. Chest X-ray confirms a left lower lobe consolidation. She can tolerate oral medications and has no recent antibiotic use. What is the recommended first-line empirical antibiotic for her community-acquired pneumonia in the community according to Australian guidelines?