@media (max-width:991px){.hero h1{font-size:36px}section{padding:60px 0}}@media (max-width:767px){.hero{padding:70px 15px}.hero h1{font-size:28px}.btn{width:100%;text-align:center}.course-card{margin-bottom:20px}}@media (max-width:480px){.hero h1{font-size:24px}section{padding:40px 0}}