/* ==========================================================================
   STEINHAUS ARCHITECTURAL PRODUCTS
   Animations Stylesheet
   Handles: keyframes, scroll-reveal utility classes, hover micro-interactions
   Reveal classes are toggled by js/main.js using IntersectionObserver.
   ========================================================================== */

/* ==========================================================================
   Keyframes
   ========================================================================== */
@keyframes heroZoom {
  from {
    transform: scale(1.12);
  }
  to {
    transform: scale(1);
  }
}

@keyframes heroZoomSlow {
  from {
    transform: scale(1.16);
  }
  to {
    transform: scale(1.02);
  }
}

@keyframes scrollLine {
  0% {
    top: -100%;
  }
  50% {
    top: 0%;
  }
  100% {
    top: 100%;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(36px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

/* ==========================================================================
   Scroll Reveal System
   Default state: hidden. ".is-visible" is added by IntersectionObserver.
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

[data-reveal="fade"] {
  transform: none;
}

[data-reveal="left"] {
  transform: translateX(-48px);
}

[data-reveal="left"].is-visible {
  transform: translateX(0);
}

[data-reveal="right"] {
  transform: translateX(48px);
}

[data-reveal="right"].is-visible {
  transform: translateX(0);
}

[data-reveal="scale"] {
  transform: scale(0.94);
}

[data-reveal="scale"].is-visible {
  transform: scale(1);
}

/* Staggered children reveal */
[data-reveal-group] > * {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

[data-reveal-group].is-visible > *:nth-child(1) {
  transition-delay: 0.05s;
}
[data-reveal-group].is-visible > *:nth-child(2) {
  transition-delay: 0.15s;
}
[data-reveal-group].is-visible > *:nth-child(3) {
  transition-delay: 0.25s;
}
[data-reveal-group].is-visible > *:nth-child(4) {
  transition-delay: 0.35s;
}
[data-reveal-group].is-visible > *:nth-child(5) {
  transition-delay: 0.45s;
}
[data-reveal-group].is-visible > *:nth-child(6) {
  transition-delay: 0.55s;
}

/* Image reveal: a mask sweeps away to unveil the photo */
.reveal-mask {
  position: relative;
  overflow: hidden;
}

.reveal-mask::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-gold);
  transform-origin: right;
  z-index: 3;
  transform: scaleX(0);
}

.reveal-mask[data-reveal].is-visible::before {
  animation: revealMask 0.9s cubic-bezier(0.76, 0, 0.24, 1) forwards;
  animation-delay: 0.15s;
}

.reveal-mask img {
  opacity: 0;
}

.reveal-mask[data-reveal].is-visible img {
  opacity: 1;
  transition: opacity 0.01s linear 0.5s;
}

/* Hero load-in sequence */
.hero-content [data-hero-item] {
  opacity: 0;
  transform: translateY(28px);
  animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-content [data-hero-item="1"] {
  animation-delay: 0.3s;
}
.hero-content [data-hero-item="2"] {
  animation-delay: 0.5s;
}
.hero-content [data-hero-item="3"] {
  animation-delay: 0.7s;
}
.hero-content [data-hero-item="4"] {
  animation-delay: 0.9s;
}

/* Loading spinner (used sparingly, e.g. form submit) */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

/* Card hover lift (reusable) */
.hover-lift {
  transition: transform var(--transition), box-shadow var(--transition);
}

.hover-lift:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-soft);
}

/* Underline sweep for text links used outside nav/footer */
.sweep-underline {
  position: relative;
  display: inline-block;
}

.sweep-underline::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 1px;
  width: 100%;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

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

@media (prefers-reduced-motion: reduce) {
  .hero-bg,
  .scroll-indicator .line::after,
  [data-reveal],
  [data-reveal-group] > *,
  .hero-content [data-hero-item] {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}