/* ================================================
   GOZARU — Animations & Transitions
   ================================================ */

/* --- Reveal on scroll (base state) --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal--left {
  transform: translateX(-30px);
}

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

.reveal--right {
  transform: translateX(30px);
}

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

/* Staggered children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.5s; }

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

/* --- Kirie clip-path decoration --- */
@keyframes clipReveal {
  from {
    clip-path: polygon(0 0, 0 0, 0 100%, 0 100%);
  }
  to {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  }
}

.clip-reveal {
  animation: clipReveal 1s cubic-bezier(0.77, 0, 0.18, 1) forwards;
  animation-play-state: paused;
}

.clip-reveal.visible {
  animation-play-state: running;
}

/* --- Hero text reveal --- */
@keyframes heroLineReveal {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__label {
  animation: heroLineReveal 0.8s ease 0.3s both;
}

.hero__title {
  animation: heroLineReveal 0.9s ease 0.5s both;
}

.hero__subtitle {
  animation: heroLineReveal 0.8s ease 0.7s both;
}

.hero__actions {
  animation: heroLineReveal 0.8s ease 0.9s both;
}

/* --- Image scale on load --- */
@keyframes imageScale {
  from {
    transform: scale(1.08);
  }
  to {
    transform: scale(1.02);
  }
}

.hero__image {
  animation: imageScale 2s ease 0s both;
}

/* --- Decorative line --- */
.deco-line {
  display: block;
  width: 0;
  height: 1px;
  background-color: var(--color-border);
  transition: width 1.2s ease;
  margin: var(--space-md) auto;
}

.deco-line.visible {
  width: 60px;
}

/* --- Loading state --- */
.page-loading {
  pointer-events: none;
}

/* --- Hover shine effect on gallery cards --- */
.gallery-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    to right,
    transparent,
    rgba(255,255,255,0.08),
    transparent
  );
  transform: skewX(-20deg);
  transition: left 0.7s ease;
  pointer-events: none;
  z-index: 3;
}

.gallery-card:hover::after {
  left: 150%;
}

/* --- Kirie paper cut decorative element --- */
.kirie-deco {
  display: inline-block;
  position: relative;
}

.kirie-deco::before {
  content: '';
  position: absolute;
  inset: -4px;
  clip-path: polygon(
    0% 15%, 15% 0%, 85% 0%, 100% 15%,
    100% 85%, 85% 100%, 15% 100%, 0% 85%
  );
  background: transparent;
  border: 1px solid var(--color-border);
}

/* --- Tab transition --- */
@keyframes tabFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.gallery-item.tab-appear {
  animation: tabFadeIn 0.4s ease both;
}

/* --- Smooth page transitions (using history.pushState alternative) --- */
.page-transition-out {
  animation: pageOut 0.3s ease forwards;
}

@keyframes pageOut {
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* --- Decorative paper texture pattern --- */
.paper-pattern {
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      rgba(0,0,0,0.03) 39px,
      rgba(0,0,0,0.03) 40px
    );
}