/* ==========================================================
   ANIMATIONS & MICRO-INTERACTIONS
   ========================================================== */

/* Fade In Up */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Scale In */
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.93); }
  to   { opacity: 1; transform: scale(1); }
}

/* Slide In Left */
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* Slide In Right */
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ==== Observe-based Animation Classes ==== */
.anim-ready {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.anim-ready.anim-visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-ready.delay-1 { transition-delay: 0.1s; }
.anim-ready.delay-2 { transition-delay: 0.2s; }
.anim-ready.delay-3 { transition-delay: 0.3s; }
.anim-ready.delay-4 { transition-delay: 0.4s; }
.anim-ready.delay-5 { transition-delay: 0.5s; }
.anim-ready.delay-6 { transition-delay: 0.6s; }

.anim-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.anim-scale.anim-visible {
  opacity: 1;
  transform: scale(1);
}

/* Number counter animation */
.counter-num {
  display: inline-block;
}

/* Shimmer loading effect */
@keyframes shimmer {
  from { background-position: -400px 0; }
  to   { background-position: 400px 0; }
}

.shimmer {
  background: linear-gradient(
    90deg,
    var(--color-bg-card) 25%,
    var(--color-bg-card-hover) 50%,
    var(--color-bg-card) 75%
  );
  background-size: 800px 100%;
  animation: shimmer 1.5s infinite;
}

/* Underline hover effect for links */
.link-underline {
  position: relative;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--transition-normal);
}

.link-underline:hover::after {
  width: 100%;
}

/* Glow effect on hover */
.glow-hover {
  transition: box-shadow var(--transition-normal);
}

.glow-hover:hover {
  box-shadow: 0 0 25px rgba(245, 197, 24, 0.25);
}

/* Spin animation for loading icons */
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Bounce animation */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

/* Accordion panel */
.accordion-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.accordion-panel.open {
  max-height: 600px;
}

/* Active tab underline indicator */
.tab-indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Ripple effect on button click */
.btn-ripple {
  position: relative;
  overflow: hidden;
}

.btn-ripple .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  animation: rippleAnim 0.6s linear;
  pointer-events: none;
}

@keyframes rippleAnim {
  0%   { transform: scale(0); opacity: 1; }
  100% { transform: scale(4); opacity: 0; }
}

/* Tooltip */
.tooltip-wrap {
  position: relative;
  display: inline-block;
}

.tooltip-wrap .tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(20, 20, 20, 0.95);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-primary);
  font-size: var(--fs-xs);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 100;
}

.tooltip-wrap:hover .tooltip {
  opacity: 1;
}

/* ==========================================================
   PAGE TRANSITION / LOADING
   ========================================================== */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--color-bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

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

.page-loader__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ==========================================================
   BACK TO TOP BUTTON
   ========================================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(245, 197, 24, 0.3);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  border: none;
  z-index: 900;
}

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

.back-to-top:hover {
  background: var(--color-accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(245, 197, 24, 0.4);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
  fill: #000;
}