/* ============================================
   ANIMATIONS — Scroll reveals, transitions,
   scroll-driven animations, view transitions
   ============================================ */

/* --- View Transitions API (progressive enhancement) --- */
@supports (view-transition-name: auto) {
  @view-transition {
    navigation: auto;
  }

  ::view-transition-old(page) {
    animation: fadeSlideOut 300ms var(--ease-out-expo);
  }

  ::view-transition-new(page) {
    animation: fadeSlideIn 300ms var(--ease-out-expo);
  }
}

@keyframes fadeSlideOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-20px); }
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 550ms var(--ease-out-expo),
              transform 550ms var(--ease-out-expo);
}

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

/* Staggered children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms var(--ease-out-expo),
              transform 500ms var(--ease-out-expo);
}

.reveal-stagger.visible > *:nth-child(1)  { transition-delay: 0ms; }
.reveal-stagger.visible > *:nth-child(2)  { transition-delay: 60ms; }
.reveal-stagger.visible > *:nth-child(3)  { transition-delay: 120ms; }
.reveal-stagger.visible > *:nth-child(4)  { transition-delay: 180ms; }
.reveal-stagger.visible > *:nth-child(5)  { transition-delay: 240ms; }
.reveal-stagger.visible > *:nth-child(6)  { transition-delay: 300ms; }
.reveal-stagger.visible > *:nth-child(7)  { transition-delay: 360ms; }
.reveal-stagger.visible > *:nth-child(8)  { transition-delay: 420ms; }
.reveal-stagger.visible > *:nth-child(9)  { transition-delay: 480ms; }
.reveal-stagger.visible > *:nth-child(10) { transition-delay: 540ms; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Reveal from left */
.reveal--left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 550ms var(--ease-out-expo),
              transform 550ms var(--ease-out-expo);
}

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

/* Reveal from right */
.reveal--right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 550ms var(--ease-out-expo),
              transform 550ms var(--ease-out-expo);
}

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

/* Reveal scale */
.reveal--scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 550ms var(--ease-out-expo),
              transform 550ms var(--ease-out-expo);
}

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

/* --- Hero Text Reveal (split lines) --- */
.hero-text-reveal {
  overflow: hidden;
}

.hero-text-reveal__line {
  display: block;
  transform: translateY(110%);
  transition: transform 800ms var(--ease-out-expo);
}

.hero-text-reveal.visible .hero-text-reveal__line {
  transform: translateY(0);
}

.hero-text-reveal.visible .hero-text-reveal__line:nth-child(2) {
  transition-delay: 120ms;
}

.hero-text-reveal.visible .hero-text-reveal__line:nth-child(3) {
  transition-delay: 240ms;
}

/* --- Page Transition (default vertical) --- */
.page-transition-enter {
  animation: pageEnter 500ms var(--ease-out-expo) forwards;
}

.page-transition-exit {
  animation: pageExit 300ms var(--ease-out-expo) forwards;
}

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(30px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@keyframes pageExit {
  from { opacity: 1; transform: translateY(0); filter: blur(0); }
  to   { opacity: 0; transform: translateY(-20px); filter: blur(4px); }
}

/* Slide transitions now handled by Web Animations API in router.js */

/* --- Floating Animation (for decorative elements) --- */
.float {
  animation: float 6s var(--ease-in-out-quint) infinite alternate;
}

@keyframes float {
  from { transform: translateY(0); }
  to   { transform: translateY(-15px); }
}

/* --- Magnetic hover (enhanced with JS) --- */
.magnetic {
  transition: transform var(--transition-fast);
}

/* --- Text Gradient Animation --- */
.text-gradient {
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--purple) 50%,
    var(--accent) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textGradient 4s linear infinite;
}

@keyframes textGradient {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* --- Pulse glow --- */
.pulse-glow {
  animation: pulseGlow 2s var(--ease-in-out-quint) infinite;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 20px 5px var(--accent-glow); }
}

/* --- Scroll progress bar --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  z-index: calc(var(--z-sticky) + 1);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 100ms linear;
}

/* --- Parallax layer (controlled by JS) --- */
.parallax {
  will-change: transform;
  transition: transform 100ms linear;
}

/* --- Loading skeleton --- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 25%,
    var(--bg-elevated) 50%,
    var(--bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeletonPulse 1.5s var(--ease-smooth) infinite;
  border-radius: var(--radius-md);
}

@keyframes skeletonPulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Marquee text --- */
.marquee {
  overflow: hidden;
  white-space: nowrap;
}

.marquee__inner {
  display: inline-flex;
  gap: var(--space-xl);
  animation: marquee 30s linear infinite;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}