A 58-year-old man from Mumbai presents with progressive dyspnea, orthopnea, and lower limb edema for 6 months. On examination, he has hepatomegaly (firm, non-tender) and a blood pressure of 110/70 mmHg with a regular pulse. Echocardiography shows concentric left ventricular hypertrophy with restrictive filling pattern and preserved ejection fraction. Serum creatinine is 1.8 mg/dL with proteinuria of 2.5 g/24 hours. Cardiac biopsy shows Congo red-positive, birefringent material in the myocardium under polarized light. What is the most likely type of amyloidosis?