/* =============================================================================
   Nobilis Residences — animations.css
   Scroll-triggered animations, transitions, keyframes
   ============================================================================= */


/* -----------------------------------------------------------------------------
   Scroll-reveal: base state (hidden)
   Applied via JS with Intersection Observer
   ----------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Staggered children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-stagger--visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger--visible > *:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger--visible > *:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger--visible > *:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger--visible > *:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger--visible > *:nth-child(6) { transition-delay: 500ms; }

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

/* Fade only (no translate) */
.reveal-fade {
  opacity: 0;
  transition: opacity 800ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Slide from left */
.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Slide from right */
.reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

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


/* -----------------------------------------------------------------------------
   Respect reduced motion
   ----------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-fade,
  .reveal-left,
  .reveal-right,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


/* -----------------------------------------------------------------------------
   Page transition (body fade-in on load)
   ----------------------------------------------------------------------------- */
@keyframes pageFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

body {
  animation: pageFadeIn 600ms cubic-bezier(0.4, 0, 0.2, 1) both;
}


/* -----------------------------------------------------------------------------
   Image scale on hover (for cards / portfolio items)
   ----------------------------------------------------------------------------- */
.img-hover-scale {
  overflow: hidden;
}

.img-hover-scale img {
  transition: transform 800ms cubic-bezier(0.4, 0, 0.2, 1);
}

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


/* -----------------------------------------------------------------------------
   Gold line draw animation (decorative dividers)
   ----------------------------------------------------------------------------- */
@keyframes lineGrow {
  from {
    width: 0;
    opacity: 0;
  }
  to {
    width: 40px;
    opacity: 1;
  }
}

.divider--animated {
  animation: lineGrow 600ms cubic-bezier(0.4, 0, 0.2, 1) 200ms both;
}


/* -----------------------------------------------------------------------------
   Subtle parallax wrapper (JS-driven, CSS handles transform)
   ----------------------------------------------------------------------------- */
.parallax {
  will-change: transform;
}


/* -----------------------------------------------------------------------------
   Navigation scroll state transition
   ----------------------------------------------------------------------------- */
.nav {
  transition: background-color 400ms cubic-bezier(0.4, 0, 0.2, 1),
              border-color 400ms cubic-bezier(0.4, 0, 0.2, 1),
              backdrop-filter 400ms cubic-bezier(0.4, 0, 0.2, 1);
}


/* -----------------------------------------------------------------------------
   Loading state for form submission
   ----------------------------------------------------------------------------- */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 1px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
  color: var(--color-obsidian);
}