.header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white;padding:40px 30px;border-radius:10px;margin-bottom:30px;box-shadow:0 4px 6px rgba(0,0,0,.1)}.subtitle{font-size:1.1em;opacity:.95;font-weight:300}@media (max-width:768px){.header{padding:25px 20px}}