/* ============================================
   ANIMATION SYSTEM
   ============================================ */

/* --- Keyframes --- */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes revealRight {
  from { clip-path: inset(0 100% 0 0); }
  to   { clip-path: inset(0 0% 0 0); }
}

@keyframes revealUp {
  from { clip-path: inset(100% 0 0 0); }
  to   { clip-path: inset(0% 0 0 0); }
}

@keyframes lineGrow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  60%       { transform: translateY(8px); opacity: 0.4; }
}

@keyframes cursorPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.15); }
}

/* --- Scroll-triggered enter classes --- */

/* Elements start invisible, JS adds .is-visible */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

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

/* Staggered children */
.reveal-group > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.reveal-group.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-group.is-visible > *:nth-child(2) { transition-delay: 80ms; }
.reveal-group.is-visible > *:nth-child(3) { transition-delay: 160ms; }
.reveal-group.is-visible > *:nth-child(4) { transition-delay: 240ms; }
.reveal-group.is-visible > *:nth-child(5) { transition-delay: 320ms; }
.reveal-group.is-visible > *:nth-child(6) { transition-delay: 400ms; }
.reveal-group.is-visible > *:nth-child(7) { transition-delay: 480ms; }
.reveal-group.is-visible > *:nth-child(8) { transition-delay: 560ms; }

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

/* Image reveal — opacity+translate (clip-path caused blank panels) */
.img-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 1.1s var(--ease-out),
    transform 1.1s var(--ease-out);
}

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

/* Line reveal (horizontal) */
.line-reveal {
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--ease-out);
}

.line-reveal.is-visible {
  transform: scaleX(1);
}

/* Fade only */
.fade-reveal {
  opacity: 0;
  transition: opacity var(--duration-xslow) var(--ease-out);
}

.fade-reveal.is-visible {
  opacity: 1;
}

/* --- Hover: Image Zoom --- */
.img-zoom .img-wrap img,
.img-zoom img {
  transition: transform 0.65s var(--ease-out);
}

.img-zoom:hover .img-wrap img,
.img-zoom:hover img {
  transform: scale(1.04);
}

/* --- Hover: Arrow Slide --- */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--duration-med) var(--ease-out);
}

.arrow-link:hover {
  gap: var(--space-4);
}

.arrow-link .arrow {
  display: inline-block;
  transition: transform var(--duration-med) var(--ease-out);
}

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

/* --- Underline Hover --- */
.underline-hover {
  position: relative;
}

.underline-hover::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-med) var(--ease-out);
}

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

/* --- Hero Entrance --- */
.hero-text-enter {
  animation: fadeUp var(--duration-xslow) var(--ease-out) both;
}

.hero-text-enter:nth-child(1) { animation-delay: 0.4s; }
.hero-text-enter:nth-child(2) { animation-delay: 0.65s; }
.hero-text-enter:nth-child(3) { animation-delay: 0.85s; }
.hero-text-enter:nth-child(4) { animation-delay: 1.05s; }
.hero-text-enter:nth-child(5) { animation-delay: 1.25s; }

/* --- Parallax base --- */
.parallax-el {
  will-change: transform;
}

/* --- Scroll Indicator --- */
.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.scroll-indicator__line {
  width: 1px;
  height: 3rem;
  background: currentColor;
  opacity: 0.4;
  animation: scrollBounce 2s ease-in-out infinite;
  animation-delay: 1.5s;
}

.scroll-indicator__label {
  writing-mode: vertical-lr;
  text-orientation: mixed;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.5;
}

/* --- Page Transition Overlay --- */
.page-overlay {
  position: fixed;
  inset: 0;
  background: var(--near-black);
  z-index: var(--z-modal);
  pointer-events: none;
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.5s var(--ease-in-out);
}

.page-overlay.entering {
  transform: scaleY(1);
  transform-origin: bottom;
}

.page-overlay.leaving {
  transform: scaleY(0);
  transform-origin: top;
}