body { font-family: 'DM Sans', sans-serif; }

/* nav link underline animation */
.nav-link {
  position: relative;
  padding-bottom: 2px;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: #ff5c1a;
  border-radius: 2px;
  transition: width 0.25s ease;
}
.nav-link:hover::after { width: 100%; }

/* mobile menu slide */
#mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.25s ease;
  opacity: 0;
}
#mobile-menu.open {
  max-height: 400px;
  opacity: 1;
}

/* theme icon spin */
#theme-icon {
  transition: transform 0.4s ease;
}
#theme-icon.spin {
  transform: rotate(360deg);
}



.animate-on-scroll {
opacity: 0;
transform: translateY(40px);
transition: all 0.6s ease-out;
}