section.about {
  background:
    linear-gradient(rgba(255, 255, 255, 0.9), rgba(220, 255, 220, 0.92)),
    url("https://images.unsplash.com/photo-1501004318641-b39e6451bec6?auto=format&fit=crop&w=1200&q=60")
    center/cover no-repeat;
  border-radius: 12px;
  padding: 80px 0;
  box-shadow: 0 6px 25px rgba(0,0,0,0.05);
}
.sub-img {
  display: block;
  margin: 20px auto;
  width: 250px;
  height: 300px;
  border-radius: 20px;  /* ✅ Bo góc nhẹ hơn */
  object-fit: cover;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15); /* ✅ Tạo chiều sâu */
}
* {
    user-select: none;
    -webkit-user-select: none;
}