/* =================================
   INTERACTION IMPROVEMENTS
================================= */

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

.loader {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 5px solid rgba(255, 255, 255, 0.1);
  border-top: 5px solid var(--primary-color);
  animation: spin 1s linear infinite;
}

.loader-hidden {
  opacity: 0;
  visibility: hidden;
}

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

/* ---- Scroll Reveal Animations ---- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Different animation styles */
.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-left.active, .reveal-right.active {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-scale.active {
  opacity: 1;
  transform: scale(1);
}

/* Delay classes for cascade effect */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* ---- Back to Top Button ---- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--text-light);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-5px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
}

.back-to-top:active {
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  fill: var(--text-light);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .back-to-top {
    width: 40px;
    height: 40px;
    bottom: 15px;
    right: 15px;
  }
  
  .back-to-top svg {
    width: 20px;
    height: 20px;
  }
}