/**
 * i3nb Shared Loading System
 * Consistent loading animations for seamless transitions
 */

/* Shared loading spinner - matches Earth Explorer aesthetic */
@keyframes i3nb-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.i3nb-loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top: 3px solid #fff;
  border-radius: 50%;
  animation: i3nb-spin 1s linear infinite;
  margin: 0 auto;
}

/* Full-screen loading overlay for login/register transitions */
.i3nb-login-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 999999;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.i3nb-login-loading-overlay.active {
  opacity: 1;
}

.i3nb-login-loading-content {
  text-align: center;
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.i3nb-login-loading-text {
  margin-top: 20px;
  font-size: 18px;
  font-weight: 300;
  opacity: 0.9;
}

/* Welcome content fade transition */
.welcome-content {
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.welcome-content.fading-out {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
}

/* Entrance mode override for seamless transition */
body.login-transitioning {
  overflow: hidden;
}

body.login-transitioning .entrance-particles,
body.login-transitioning .bottom-nav,
body.login-transitioning .logo-container {
  transition: opacity 0.8s ease-out;
  opacity: 0;
}

/* Error state - quick fade back to login */
.i3nb-login-loading-overlay.error-state {
  transition: opacity 0.3s ease-out;
}

.i3nb-login-loading-overlay.error-state .i3nb-loading-spinner {
  border-top-color: #ff4757;
  animation-duration: 0.5s;
}

/* Success state - maintain loader until page transition */
.i3nb-login-loading-overlay.success-state {
  opacity: 1;
}

.i3nb-login-loading-overlay.success-state .i3nb-loading-spinner {
  border-top-color: #2ed573;
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .i3nb-loading-spinner {
    width: 40px;
    height: 40px;
    border-width: 2.5px;
  }
  
  .i3nb-login-loading-text {
    font-size: 16px;
    margin-top: 15px;
  }
}

@media (max-width: 480px) {
  .i3nb-loading-spinner {
    width: 35px;
    height: 35px;
    border-width: 2px;
  }
  
  .i3nb-login-loading-text {
    font-size: 14px;
    margin-top: 12px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .i3nb-loading-spinner {
    animation: none;
    border-top-color: #fff;
    opacity: 0.8;
  }
  
  .i3nb-login-loading-overlay,
  .welcome-content {
    transition: opacity 0.2s ease;
  }
}