/* ============================================
   ANIMATIONS — devangshumitra.com
   Scroll reveal, transitions, keyframes
   ============================================ */

/* ---- Scroll Reveal Base -------------------- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

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

/* Stagger delays for children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

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

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

/* Variants */
.reveal--left {
  transform: translateX(-32px);
}
.reveal--left.visible {
  transform: translateX(0);
}

.reveal--right {
  transform: translateX(32px);
}
.reveal--right.visible {
  transform: translateX(0);
}

.reveal--scale {
  transform: scale(0.95);
  opacity: 0;
}
.reveal--scale.visible {
  transform: scale(1);
  opacity: 1;
}

.reveal--fade {
  transform: none;
  opacity: 0;
}
.reveal--fade.visible {
  opacity: 1;
}

/* ---- Hero entrance animations -------------- */
.hero-enter {
  opacity: 0;
  transform: translateY(20px);
  animation: heroEnter var(--duration-slower) var(--ease-out) forwards;
}

.hero-enter:nth-child(1) { animation-delay: 200ms; }
.hero-enter:nth-child(2) { animation-delay: 400ms; }
.hero-enter:nth-child(3) { animation-delay: 600ms; }
.hero-enter:nth-child(4) { animation-delay: 800ms; }

@keyframes heroEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- Subtitle rotator ---------------------- */
.subtitle-rotator {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
}

.subtitle-slide-in {
  animation: subtitleIn 500ms var(--ease-out) forwards;
}

.subtitle-slide-out {
  animation: subtitleOut 400ms var(--ease-in) forwards;
}

@keyframes subtitleIn {
  from {
    opacity: 0;
    transform: translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes subtitleOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-100%);
  }
}

/* ---- Cursor blink (for subtitle) ----------- */
.cursor-blink {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: linear-gradient(90deg, #c9a84c 0%, #e8e8e8 50%, #c9a84c 100%);
  margin-left: 4px;
  vertical-align: text-bottom;
  animation: cursorBlink 1s step-end infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ---- Nav scroll effect --------------------- */
@keyframes navFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav {
  animation: navFadeIn 600ms var(--ease-out) forwards;
}

/* ---- Page transition ----------------------- */
@keyframes pageFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.page-enter {
  animation: pageFadeIn 400ms var(--ease-out) forwards;
}

/* ---- Hover lift (reusable) ----------------- */
.hover-lift {
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}

/* ---- Text shimmer (neutral — no gold) ------ */
@keyframes textShimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.text-shimmer {
  background: linear-gradient(
    90deg,
    var(--color-text-muted) 0%,
    var(--color-text) 40%,
    var(--color-text-muted) 80%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: textShimmer 4s linear infinite;
}

/* ---- Scroll progress bar ------------------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, #c9a84c 0%, #e8e8e8 50%, #c9a84c 100%);
  z-index: 200;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 100ms linear;
}

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

  .hero-enter {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .subtitle-slide-in,
  .subtitle-slide-out {
    animation: none;
  }

  .cursor-blink {
    animation: none;
  }

  .text-shimmer {
    animation: none;
    -webkit-text-fill-color: var(--color-text-muted);
  }
}


/* ---- CSS Scroll-Driven Hero Parallax (Chrome 115+, Safari 18+) ----------- */
@supports (animation-timeline: scroll()) {
  .hero__video-wrap {
    animation: heroParallax linear both;
    animation-timeline: scroll();
    animation-range: 0px 600px;
  }
  @keyframes heroParallax {
    to { transform: translateY(30%); }
  }
  .hero__content {
    animation: heroContentFade linear both;
    animation-timeline: scroll();
    animation-range: 0px 400px;
  }
  @keyframes heroContentFade {
    to { opacity: 0; transform: translateY(-60px); }
  }
}

/* ---- View Transition API page transitions --------------------------------- */
@view-transition { navigation: auto; }
::view-transition-old(root) {
  animation: vtFadeOut 200ms ease forwards;
}
::view-transition-new(root) {
  animation: vtFadeIn 200ms ease forwards;
}
@keyframes vtFadeOut { to { opacity: 0; } }
@keyframes vtFadeIn { from { opacity: 0; } }

/* ---- Word-by-word reveal -------------------------------------------------- */
.intro-statement .word {
  opacity: 0;
  transform: translateY(8px);
  display: inline-block;
  transition: opacity 0.4s ease, transform 0.4s ease;
  transition-delay: calc(var(--i, 0) * 30ms);
}
.intro-statement.visible .word {
  opacity: 1;
  transform: translateY(0);
}

/* Post card styles now in homepage-sections.css */