body font-family: 'Segoe UI', sans-serif; margin: 0; padding: 0; background-color: #f4f4f4; color: #333; line-height: 1.8; .container max-width: 960px; margin: 40px auto; padding: 30px; background-color: #fff; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05); h1, h2, h3 col