/* Fade-in sections */
html{
   scroll-behavior: smooth;
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 1s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Navbar links underline animation */
.nav-link {
  position: relative;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: #c49b66; /* gold */
  transition: width 0.3s ease;
}
.nav-link:hover::after {
  width: 100%;
}

/* Animated gradient background */
section {
  background-size: 200% 200%;
  animation: gradientBG 20s ease infinite;
}
@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Lightbox cursor */
#lightbox img {
  cursor: pointer;
}

/* Navy accent animated scroll button */
.scroll-btn {
  position: fixed;
  width: 64px;
  height: 64px;
  border: 4px solid transparent;
  border-radius: 12px;
  background-color: #0b1e3b; /* navy background */
  color: #ffbf00; /* amber text/icon */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
  box-shadow: 0 0 0 2px #ffbf00;
  transition: all 0.5s ease-in-out;
  z-index: 50;
}

.scroll-btn:hover {
  background-color: #050A20; /* darker navy on hover */
  box-shadow: 0 0 0 12px transparent, 0 0 15px #ffbf00; /* amber glow */
  border-radius: 16px;
}

.scroll-btn:active {
  transform: scale(0.95);
}

/* Circle effect inside button */
.scroll-btn .circle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  background-color: #ffbf00;
  border-radius: 50%;
  opacity: 0;
  transform: translate(-50%, -50%);
  transition: all 0.5s ease-in-out;
}

.scroll-btn:hover .circle {
  width: 220px;
  height: 220px;
  opacity: 0.1;
}

/* Arrow inside button */
.scroll-btn .arrow {
  font-size: 24px;
  z-index: 10;
  transition: all 0.5s ease-in-out;
}

.scroll-btn.up {
  bottom: 80px;
  right: 32px;
}

.scroll-btn.down {
  bottom: 16px;
  right: 50%;
  transform: translateX(50%);
}