html {
  scroll-behavior: smooth; /* cuộn mượt */
}
.product-sidebar {
  padding: 20px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  font-family: Arial, sans-serif;
  min-height: 1200px;
}
.sidebar-menu {
  list-style: none;
  margin: 0 0 100px 0;
  padding: 0;
  position: sticky;
  top: 100px; /* cách top 100px để không đè lên header */
  height: fit-content;
}

.sidebar-menu li {
  padding: 12px 15px;
  border-left: 3px solid transparent;
  color: #666;
  cursor: pointer;
}

.sidebar-menu li.active {
  font-weight: bold;
  border-left: 3px solid #1774c4; /* xanh */
  color: #000;
}

.sidebar-menu li a {
  color: inherit;
  text-decoration: none;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 15px;
  position: sticky;
  top: 250px; /* cách top 100px để không đè lên header */
  height: fit-content;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: #333;
  text-decoration: none;
}

.nav-btn .icon {
  width: 32px;
  height: 32px;
  border: 1px solid #ccc;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
@media screen and (max-width: 900px) {
  .product-sidebar{
    display: none;
  }
}