Nhẫn Aquamarine Tự Nhiên – Vẻ Đẹp Của Biển Cả & Tình Yêu Vĩnh Cửu body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.8; max-width: 1100px; margin: 20px auto; padding: 0 20px; color: #333; background: #f9f9f9; } .product-card { background: #fff; border-radius: 16px; box-shadow: 0 8px 24px rgba(0,0,0,0.08); padding: 32px; margin: 24px 0; } h1 { font-size: 2rem; color: #0a4b7a; border-bottom: 3px solid #2a9df4; padding-bottom: 10px; margin-bottom: 20px; } h2 { font-size: 1.5rem; color: #0a4b7a; margin-top: 36px; border-left: 5px solid #2a9df4; padding-left: 15px; } h3 { font-size: 1.2rem; color: #1e6f9f; margin-top: 28px; } p, li { font-size: 1.02rem; text-align: justify; } strong { color: #0b5e8a; font-weight: 700; } .cta-box { background: linear-gradient(...