/* Portfolio Nav Bar */
#portfolio-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 99999;
  background: transparent;
  padding: 0;
  margin: 0;
  mix-blend-mode: exclusion;
  transition: mix-blend-mode 0.3s ease;
}
#portfolio-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 0;
  opacity: 0;
  transition: opacity 1.08s cubic-bezier(0.4, 0, 0.2, 1); /* fade out: 1.8x slower, fast start → slow end */
}
#portfolio-nav.visible ul {
  opacity: 1;
  transition: opacity 0.6s ease; /* fade in: normal speed */
}
#portfolio-nav li {
  margin: 0;
  padding: 0;
}
#portfolio-nav a {
  display: block;
  padding: 14px 24px;
  color: #fff;
  text-decoration: none;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  letter-spacing: 0.5px;
  border: none;
}
#portfolio-nav a:hover {
  color: #fff;
  border: none;
}
#portfolio-nav a.active {
  color: #fff;
}
@media (max-width: 640px) {
  #portfolio-nav a {
    padding: 10px 12px;
    font-size: 11px;
  }
}