footer {
  background: #111;
  color: #fff;
  padding: 60px 20px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin-top: 100px;
}
footer h2, footer h4 {
  color: #fff;
  margin-bottom: 12px;
}
footer h2 {
  font-size: 24px;
}
footer h4 {
  font-size: 16px;
}
footer p, footer li, footer a {
  font-size: 14px;
  color: #ccc;
  line-height: 1.8;
}
footer a {
  text-decoration: none;
  transition: color 0.3s ease;
}
footer a:hover {
  color: #fff;
}
footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
footer .footer-container {
  max-width: 1200px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 40px;
}
footer .social-icons {
  display: grid;
  grid-template-columns: repeat(2, 40px);
  grid-template-rows: repeat(2, 40px);
  gap: 12px;
}
footer .social-icons a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 18px;
  color: #fff;
  transition: transform 0.3s ease;
}
footer .social-icons a[aria-label="Facebook"] {
  background-color: #1877f2;
}
footer .social-icons a[aria-label="Instagram"] {
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
}
footer .social-icons a[aria-label="YouTube"] {
  background-color: #ff0000;
}
footer .social-icons a[aria-label="Zalo"] {
  background-color: #0180ef;
}
footer .social-icons a:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}
footer .copyright {
  text-align: center;
  margin-top: 40px;
  font-size: 13px;
  color: #aaa;
  padding-top: 20px;
  border-top: 1px solid #333;
}