/* Custom Variables & Global Enhancements */
:root {
  color-scheme: dark;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #121520;
}
::-webkit-scrollbar-thumb {
  background: #1e2538;
  border-radius: 9999px;
  border: 2.5px solid #121520;
}
::-webkit-scrollbar-thumb:hover {
  background: #38DEC2;
}

/* Smooth Focus Indicators (WCAG Compliant) */
*:focus-visible {
  outline: 2px solid #38DEC2;
  outline-offset: 4px;
}

/* Active State for Navigation Links */
.nav-link.active-link {
  color: #38DEC2 !important;
  position: relative;
}
.nav-link.active-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #38DEC2;
  border-radius: 2px;
}

/* Single-Page Application (SPA) Views Optimization */
.spa-view {
  transition: opacity 0.3s ease;
}

/* Fast SPA View Switching with State Caching */
.spa-view.inactive {
  /* Cache the rendering state of inactive views */
  content-visibility: hidden;
  position: absolute;
  width: 100%;
  pointer-events: none;
  opacity: 0;
}

/* Fallback for older browsers that do not support content-visibility */
@supports not (content-visibility: hidden) {
  .spa-view.inactive {
    display: none !important;
  }
}

/* View Transitions Keyframes & Configurations */
@keyframes slide-to-left {
  to { transform: translateX(-40px); opacity: 0; }
}

@keyframes slide-from-right {
  from { transform: translateX(40px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slide-to-right {
  to { transform: translateX(40px); opacity: 0; }
}

@keyframes slide-from-left {
  from { transform: translateX(-40px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

::view-transition-group(root) {
  animation: 0.35s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Forward transition (Home -> Privacy) */
html:active-view-transition-type(forward)::view-transition-old(root) {
  animation-name: slide-to-left;
}
html:active-view-transition-type(forward)::view-transition-new(root) {
  animation-name: slide-from-right;
}

/* Backward transition (Privacy -> Home) */
html:active-view-transition-type(backward)::view-transition-old(root) {
  animation-name: slide-to-right;
}
html:active-view-transition-type(backward)::view-transition-new(root) {
  animation-name: slide-from-left;
}

/* Respect user preferences for reduced motion */
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(root) {
    animation: none !important;
  }
  .spa-view {
    transition: none !important;
  }
  .animate-fade-in,
  .animate-slide-up {
    animation: none !important;
  }
}

/* Custom Animation Utility Classes */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.animate-fade-in {
  animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-slide-up {
  animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0; /* starts invisible, animated in */
}

/* Device screen slide transitions for manual/auto slider */
#carousel-slides {
  will-change: transform;
}