*{box-sizing:border-box;margin:0;padding:0}body{background-color:#f9fafb;color:#333;font-family:Arial,sans-serif;line-height:1.6}section{padding:4rem 2rem}h1,h2,h3{color:#036;font-weight:700}a{color:#61dafb;text-decoration:none;transition:color .3s ease}a:hover{color:#50b4db}.btn,button{border:none;border-radius:25px;cursor:pointer;display:inline-block;font-size:1rem;font-weight:700;padding:.75rem 1.5rem;transition:background .3s ease,transform .3s ease}.btn:hover,button:hover{transform:scale(1.05)}@media (max-width:768px){section{padding:2rem 1rem}h1,h2,h3{font-size:1.5rem}}