/* =========================================================
   Animations CSS
   ASP.NET Core Razor Pages frontend starter

   Purpose:
   - Provide lightweight animations for Razor Pages projects.
   - Use for hero sections, cards, CTA areas, forms and small UI effects.
   - Prefer CSS animations and vanilla JavaScript.
   - Do not use heavy animation libraries unless necessary.
========================================================= */

/* =========================================================
   1. Animation Variables
========================================================= */

:root {
  --anim-fast: 180ms;
  --anim-base: 260ms;
  --anim-slow: 420ms;

  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-standard: ease;
}

/* =========================================================
   2. Fade Animations
========================================================= */

.fade-in {
  animation: fadeIn var(--anim-slow, 420ms) var(--ease-soft, ease) both;
}

.fade-in-up {
  animation: fadeInUp var(--anim-slow, 420ms) var(--ease-soft, ease) both;
}

.fade-in-down {
  animation: fadeInDown var(--anim-slow, 420ms) var(--ease-soft, ease) both;
}

.fade-in-left {
  animation: fadeInLeft var(--anim-slow, 420ms) var(--ease-soft, ease) both;
}

.fade-in-right {
  animation: fadeInRight var(--anim-slow, 420ms) var(--ease-soft, ease) both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-22px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-22px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(22px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* =========================================================
   3. Reveal on Scroll Base

   Use with JS IntersectionObserver.
   Initial state is hidden.
   JS adds .is-visible.
========================================================= */

/* will-change is limited to reveal elements only: they are the ones
   animating during scroll. Do not spread this hint across the page. */
.reveal,
.reveal-left,
.reveal-right {
  will-change: transform, opacity;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 600ms var(--ease-soft, ease),
    transform 600ms var(--ease-soft, ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-24px);
  transition:
    opacity 600ms var(--ease-soft, ease),
    transform 600ms var(--ease-soft, ease);
}

.reveal-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(24px);
  transition:
    opacity 600ms var(--ease-soft, ease),
    transform 600ms var(--ease-soft, ease);
}

.reveal-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* =========================================================
   4. Animation Delays
========================================================= */

.delay-1 {
  animation-delay: 100ms;
  transition-delay: 100ms;
}

.delay-2 {
  animation-delay: 180ms;
  transition-delay: 180ms;
}

.delay-3 {
  animation-delay: 260ms;
  transition-delay: 260ms;
}

.delay-4 {
  animation-delay: 340ms;
  transition-delay: 340ms;
}

.delay-5 {
  animation-delay: 420ms;
  transition-delay: 420ms;
}

/* =========================================================
   5. Hover Lift
========================================================= */

/* box-shadow is intentionally not transitioned (repaint per frame);
   it snaps while transform animates on the compositor. */
.hover-lift {
  transition: transform var(--anim-base, 260ms) var(--ease-soft, ease);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md, 0 12px 28px rgba(16, 24, 40, 0.1));
}

.hover-lift-sm {
  transition: transform var(--anim-base, 260ms) var(--ease-soft, ease);
}

.hover-lift-sm:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm, 0 4px 12px rgba(16, 24, 40, 0.08));
}

/* =========================================================
   6. Image Zoom Hover
========================================================= */

.image-zoom {
  overflow: hidden;
}

.image-zoom img {
  transition: transform 600ms var(--ease-soft, ease);
}

.image-zoom:hover img {
  transform: scale(1.05);
}

/* =========================================================
   7. Soft Pulse
========================================================= */

.pulse-soft {
  animation: pulseSoft 2.2s ease-in-out infinite;
}

@keyframes pulseSoft {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.035);
    opacity: 0.88;
  }
}

/* =========================================================
   8. Floating Effect
========================================================= */

.float-soft {
  animation: floatSoft 5s ease-in-out infinite;
}

.float-slow {
  animation: floatSoft 8s ease-in-out infinite;
}

@keyframes floatSoft {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

/* =========================================================
   9. Shimmer Highlight

   Useful for small premium light effects.
   Use carefully, not everywhere.
========================================================= */

.shimmer {
  position: relative;
  overflow: hidden;
}

.shimmer::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-120%);
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.28),
    transparent
  );
  animation: shimmerMove 2.4s ease-in-out infinite;
}

@keyframes shimmerMove {
  0% {
    transform: translateX(-120%);
  }

  55%,
  100% {
    transform: translateX(120%);
  }
}

/* =========================================================
   10. Underline Animation
========================================================= */

.link-underline-animate {
  position: relative;
  display: inline-flex;
  text-decoration: none;
}

.link-underline-animate::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;

  width: 100%;
  height: 2px;

  background: currentColor;
  border-radius: var(--radius-full, 999px);

  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--anim-base, 260ms) var(--ease-soft, ease);
}

.link-underline-animate:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* =========================================================
   11. Button Arrow Animation
========================================================= */

.btn-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-arrow::after {
  content: "→";
  transition: transform var(--anim-base, 260ms) var(--ease-soft, ease);
}

.btn-arrow:hover::after {
  transform: translateX(4px);
}

/* =========================================================
   12. Loading Spinner
========================================================= */

.spinner-custom {
  width: 1.25rem;
  height: 1.25rem;

  border: 2px solid color-mix(in srgb, currentColor 24%, transparent);
  border-top-color: currentColor;
  border-radius: var(--radius-full, 999px);

  animation: spin 700ms linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* =========================================================
   13. Skeleton Loading
========================================================= */

.skeleton {
  position: relative;
  overflow: hidden;

  color: transparent;
  background: var(--color-surface-soft, #f9fafb);
  border-radius: var(--radius-sm, 0.5rem);
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;

  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.62),
    transparent
  );

  animation: skeletonLoading 1.4s ease-in-out infinite;
}

@keyframes skeletonLoading {
  100% {
    transform: translateX(100%);
  }
}

/* =========================================================
   14. Accordion Animation Helpers
========================================================= */

.accordion-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--anim-base, 260ms) var(--ease-soft, ease);
}

.accordion-content.is-open {
  grid-template-rows: 1fr;
}

.accordion-content-inner {
  overflow: hidden;
}

/* =========================================================
   15. Modal / Overlay Helpers
========================================================= */

.overlay-fade {
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--anim-base, 260ms) var(--ease-standard, ease);
}

.overlay-fade.is-open {
  opacity: 1;
  pointer-events: auto;
}

.modal-pop {
  opacity: 0;
  transform: translateY(18px) scale(0.98);
  transition:
    opacity var(--anim-base, 260ms) var(--ease-soft, ease),
    transform var(--anim-base, 260ms) var(--ease-soft, ease);
}

.overlay-fade.is-open .modal-pop,
.modal-pop.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* =========================================================
   16. Toast Animation
========================================================= */

.toast-slide-in {
  animation: toastSlideIn 280ms var(--ease-soft, ease) both;
}

.toast-slide-out {
  animation: toastSlideOut 220ms var(--ease-standard, ease) both;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px) translateX(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0) translateX(0);
  }
}

@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateY(0) translateX(0);
  }

  to {
    opacity: 0;
    transform: translateY(12px) translateX(12px);
  }
}

/* =========================================================
   17. Hero Entrance Example
========================================================= */

.hero-animate .hero-eyebrow {
  animation: fadeInUp 520ms var(--ease-soft, ease) both;
}

.hero-animate .hero-title {
  animation: fadeInUp 620ms var(--ease-soft, ease) 90ms both;
}

.hero-animate .hero-description {
  animation: fadeInUp 620ms var(--ease-soft, ease) 180ms both;
}

.hero-animate .hero-actions {
  animation: fadeInUp 620ms var(--ease-soft, ease) 270ms both;
}

.hero-animate .hero-media {
  animation: fadeInRight 720ms var(--ease-soft, ease) 240ms both;
}

/* =========================================================
   18. Card Stagger Helper

   Add .stagger-list to parent and .stagger-item to children.
========================================================= */

.stagger-list .stagger-item {
  opacity: 0;
  transform: translateY(18px);
  animation: fadeInUp 520ms var(--ease-soft, ease) both;
}

.stagger-list .stagger-item:nth-child(1) {
  animation-delay: 80ms;
}

.stagger-list .stagger-item:nth-child(2) {
  animation-delay: 150ms;
}

.stagger-list .stagger-item:nth-child(3) {
  animation-delay: 220ms;
}

.stagger-list .stagger-item:nth-child(4) {
  animation-delay: 290ms;
}

.stagger-list .stagger-item:nth-child(5) {
  animation-delay: 360ms;
}

.stagger-list .stagger-item:nth-child(6) {
  animation-delay: 430ms;
}

/* =========================================================
   19. Reduced Motion

   Very important for accessibility.
========================================================= */

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .fade-in-up,
  .fade-in-down,
  .fade-in-left,
  .fade-in-right,
  .pulse-soft,
  .float-soft,
  .float-slow,
  .shimmer::after,
  .spinner-custom,
  .skeleton::after,
  .toast-slide-in,
  .toast-slide-out,
  .hero-animate .hero-eyebrow,
  .hero-animate .hero-title,
  .hero-animate .hero-description,
  .hero-animate .hero-actions,
  .hero-animate .hero-media,
  .stagger-list .stagger-item {
    animation: none !important;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .hover-lift,
  .hover-lift-sm,
  .image-zoom img,
  .link-underline-animate::after,
  .btn-arrow::after,
  .accordion-content,
  .overlay-fade,
  .modal-pop {
    transition: none !important;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .stagger-list .stagger-item {
    opacity: 1 !important;
    transform: none !important;
  }

  .hover-lift:hover,
  .hover-lift-sm:hover,
  .image-zoom:hover img,
  .btn-arrow:hover::after {
    transform: none !important;
  }
}