@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;800&display=swap');
:root{
  --accent1: #ff7a18;
  --accent2: #8b5cf6;
}
body { font-family: 'Poppins', sans-serif; }

/* small custom styles */
.icon { font-weight: 700; color: #111827; }
.animate-float { animation: float 4s ease-in-out infinite; }
.animate-float.delay-200 { animation-delay: 0.2s; }
.animate-float.delay-300 { animation-delay: 0.3s; }
.animate-float.delay-400 { animation-delay: 0.4s; }

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-12px) rotate(-2deg); }
  100% { transform: translateY(0px); }
}

/* Make hero responsive */
@media (max-width: 900px) {
  h1 { font-size: 2.2rem; }
}


/* Nút lên đầu trang */
#backToTop {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: #333;
  color: white;
  cursor: pointer;
  padding: 12px 16px;
  border-radius: 50%;
  transition: 0.3s;
}
#backToTop:hover {
  background-color: #555;
}