/* ============================================
   StressAId — Animations & Transitions
   Keyframes, scroll reveals, stagger utilities,
   reduced motion respect
   ============================================ */

/* -----------------------------------------------
   Core Keyframes
   ----------------------------------------------- */

/* Fade In — Simple opacity transition */
@keyframes sai-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Fade Up — Rise with opacity */
@keyframes sai-fade-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade Down — Drop with opacity */
@keyframes sai-fade-down {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide In Left — Enter from left */
@keyframes sai-slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Slide In Right — Enter from right */
@keyframes sai-slide-in-right {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scale In — Grow from center */
@keyframes sai-scale-in {
  from {
    opacity: 0;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Pulse — Notification / attention */
@keyframes sai-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.05);
  }
}

/* Spin — Loader rotation */
@keyframes sai-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Shimmer — Skeleton loading */
@keyframes sai-shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* Bounce — Attention grabber */
@keyframes sai-bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-12px);
  }
  60% {
    transform: translateY(-6px);
  }
}

/* Shake — Error / Warning */
@keyframes sai-shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-4px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(4px);
  }
}

/* Float — Gentle hover effect */
@keyframes sai-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* Ping — Ripple / notification dot */
@keyframes sai-ping {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

/* -----------------------------------------------
   Animation Utility Classes
   ----------------------------------------------- */
.sai-animate-fade-in {
  animation: sai-fade-in 0.4s ease both;
}

.sai-animate-fade-up {
  animation: sai-fade-up 0.5s ease both;
}

.sai-animate-fade-down {
  animation: sai-fade-down 0.5s ease both;
}

.sai-animate-slide-left {
  animation: sai-slide-in-left 0.5s ease both;
}

.sai-animate-slide-right {
  animation: sai-slide-in-right 0.5s ease both;
}

.sai-animate-scale-in {
  animation: sai-scale-in 0.4s var(--sai-ease-spring) both;
}

.sai-animate-pulse {
  animation: sai-pulse 2s ease-in-out infinite;
}

.sai-animate-spin {
  animation: sai-spin 1s linear infinite;
}

.sai-animate-shimmer {
  background: linear-gradient(
    90deg,
    var(--sai-bg-card) 25%,
    var(--sai-bg-elevated) 50%,
    var(--sai-bg-card) 75%
  );
  background-size: 200% 100%;
  animation: sai-shimmer 1.5s ease-in-out infinite;
}

.sai-animate-bounce {
  animation: sai-bounce 1s ease infinite;
}

.sai-animate-shake {
  animation: sai-shake 0.5s ease;
}

.sai-animate-float {
  animation: sai-float 3s ease-in-out infinite;
}

/* -----------------------------------------------
   Scroll-Triggered Reveal Classes
   Elements start hidden, become visible when
   `.sai-reveal--visible` class is added via JS
   ----------------------------------------------- */

/* Base reveal — hidden and offset by default */
.sai-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
  will-change: opacity, transform;
}

/* Revealed state — both class names supported */
.sai-reveal.sai-reveal--visible,
.sai-reveal.sai-revealed {
  opacity: 1;
  transform: none !important;
}

/* Reveal Up — Start translated down */
.sai-reveal--up {
  transform: translateY(30px);
}

/* Reveal Down — Start translated up */
.sai-reveal--down {
  transform: translateY(-30px);
}

/* Reveal Left — Start offset left */
.sai-reveal--left {
  transform: translateX(-30px);
}

/* Reveal Right — Start offset right */
.sai-reveal--right {
  transform: translateX(30px);
}

/* Reveal Scale — Start smaller */
.sai-reveal--scale {
  transform: scale(0.9);
}

/* Reveal Rotate — Start slightly rotated */
.sai-reveal--rotate {
  transform: rotate(-3deg) translateY(16px);
}

/* Slower / faster reveal transitions */
.sai-reveal--slow {
  transition-duration: 0.9s;
}

.sai-reveal--fast {
  transition-duration: 0.35s;
}

/* Spring easing for reveal */
.sai-reveal--spring {
  transition-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* -----------------------------------------------
   Stagger Delay Utilities
   Apply to children for cascading reveal effect
   ----------------------------------------------- */
.sai-delay-1 {
  transition-delay: 0.1s;
  animation-delay: 0.1s;
}

.sai-delay-2 {
  transition-delay: 0.2s;
  animation-delay: 0.2s;
}

.sai-delay-3 {
  transition-delay: 0.3s;
  animation-delay: 0.3s;
}

.sai-delay-4 {
  transition-delay: 0.4s;
  animation-delay: 0.4s;
}

.sai-delay-5 {
  transition-delay: 0.5s;
  animation-delay: 0.5s;
}

.sai-delay-6 {
  transition-delay: 0.6s;
  animation-delay: 0.6s;
}

/* -----------------------------------------------
   Ping / Notification Dot
   Used for unread indicators
   ----------------------------------------------- */
.sai-ping {
  position: relative;
}

.sai-ping::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 8px;
  height: 8px;
  border-radius: var(--sai-radius-full);
  background: var(--sai-danger);
}

.sai-ping::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 8px;
  height: 8px;
  border-radius: var(--sai-radius-full);
  background: var(--sai-danger);
  animation: sai-ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
}

/* -----------------------------------------------
   Transition Helpers
   ----------------------------------------------- */
.sai-transition-all {
  transition: all var(--sai-ease-normal);
}

.sai-transition-fast {
  transition: all var(--sai-ease-fast);
}

.sai-transition-slow {
  transition: all var(--sai-ease-slow);
}

.sai-transition-colors {
  transition:
    color var(--sai-ease-fast),
    background-color var(--sai-ease-fast),
    border-color var(--sai-ease-fast);
}

.sai-transition-transform {
  transition: transform var(--sai-ease-normal);
}

.sai-transition-opacity {
  transition: opacity var(--sai-ease-normal);
}

/* -----------------------------------------------
   Hover Microinteractions
   ----------------------------------------------- */
.sai-hover-lift:hover {
  transform: translateY(-2px);
}

.sai-hover-scale:hover {
  transform: scale(1.03);
}

.sai-hover-glow:hover {
  box-shadow: var(--sai-shadow-glow-teal);
}

.sai-hover-glow-gold:hover {
  box-shadow: var(--sai-shadow-glow-gold);
}

/* -----------------------------------------------
   Page Transition Wrapper
   Used for content area fade-in on page load
   ----------------------------------------------- */
.sai-page-enter {
  animation: sai-fade-up 0.4s ease both;
}

.sai-page-enter--fast {
  animation: sai-fade-in 0.25s ease both;
}

/* -----------------------------------------------
   Loading States
   ----------------------------------------------- */
.sai-loader {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.sai-loader__spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--sai-border);
  border-top-color: var(--sai-teal-primary);
  border-radius: var(--sai-radius-full);
  animation: sai-spin 0.7s linear infinite;
}

.sai-loader__spinner--sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.sai-loader__spinner--lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* Full-page loader */
.sai-page-loader {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sai-bg-darkest);
  z-index: var(--sai-z-overlay);
}

.sai-page-loader__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sai-space-md);
}

.sai-page-loader__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--sai-border);
  border-top-color: var(--sai-teal-primary);
  border-radius: var(--sai-radius-full);
  animation: sai-spin 0.8s linear infinite;
}

.sai-page-loader__text {
  font-size: var(--sai-text-sm);
  color: var(--sai-text-muted);
}

/* Skeleton shimmer bars (used inline) */
.sai-skeleton-bar {
  display: block;
  background: linear-gradient(
    90deg,
    var(--sai-bg-card) 25%,
    var(--sai-bg-elevated) 50%,
    var(--sai-bg-card) 75%
  );
  background-size: 200% 100%;
  animation: sai-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--sai-radius-md);
}

.sai-skeleton-bar--xs {
  height: 8px;
  width: 40%;
}

.sai-skeleton-bar--sm {
  height: 12px;
  width: 60%;
}

.sai-skeleton-bar--md {
  height: 16px;
  width: 80%;
}

.sai-skeleton-bar--lg {
  height: 24px;
  width: 100%;
}

.sai-skeleton-bar--circle {
  width: 40px;
  height: 40px;
  border-radius: var(--sai-radius-full);
}

/* -----------------------------------------------
   Reduced Motion — Respect User Preference
   Disables all animations and transitions
   ----------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .sai-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .sai-animate-pulse,
  .sai-animate-spin,
  .sai-animate-shimmer,
  .sai-animate-bounce,
  .sai-animate-float {
    animation: none !important;
  }

  .sai-ping::before {
    animation: none !important;
  }

  .sai-skeleton-bar,
  .sai-animate-shimmer {
    animation: none !important;
    background: var(--sai-bg-elevated) !important;
  }

  .sai-hover-lift:hover,
  .sai-hover-scale:hover {
    transform: none !important;
  }

  .sai-loader__spinner,
  .sai-page-loader__spinner {
    /* Keep spin for loaders — essential feedback */
    animation: sai-spin 1.5s linear infinite !important;
  }
}