.course-public-hero{margin:20px auto 28px;max-width:1100px;padding:0 20px}.course-public-hero img{display:block;width:100%;height:auto;max-height:460px;object-fit:contain;border-radius:18px;box-shadow:0 8px 28px #17392b12}@media(max-width:640px){.course-public-hero{margin:12px auto 20px;padding:0 12px}}