/* Modern Enhancements - Essential Features Only */

/* Smooth scrolling enhancement */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--body-color);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loader {
  width: 60px;
  height: 60px;
  border: 3px solid transparent;
  border-top: 3px solid var(--skin-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  position: relative;
}

.loader::before {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border: 3px solid transparent;
  border-top: 3px solid rgba(102, 126, 234, 0.5);
  border-radius: 50%;
  animation: spin 2s linear infinite reverse;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Particle Background */
#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1;
  background: linear-gradient(
    45deg,
    var(--body-color) 0%,
    hsl(var(--hue-color), 19%, 8%) 100%
  );
}

/* Enhanced Navigation */
.nav__link {
  position: relative;
  transition: all 0.4s ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
  background: var(--skin-color);
  transition: width 0.4s ease;
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
  background: none;
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s ease;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px) scale(1.1);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.back-to-top:active {
  transform: scale(0.95);
}

@media screen and (max-width: 768px) {
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 45px;
    height: 45px;
  }
}