/* =============================================================================
   PEARL VEIL — ANIMATIONS & TRANSITIONS
   ─────────────────────────────────────────────────────────────────────────────
   All keyframes, scroll reveal animations, hover effects, and transitions.
   Animations are disabled automatically for users who prefer reduced motion
   via the @media (prefers-reduced-motion: reduce) rule in reset.css.
   ============================================================================= */

/* ─── KEYFRAMES ───────────────────────────────────────────────────────────────  */

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

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeLeft {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeRight {
  from {
    opacity: 0;
    transform: translateX(-24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to   { transform: translateX(0); }
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to   { transform: translateX(0); }
}

/* Silk thread draw animation — the site's signature element */
@keyframes drawLine {
  from { width: 0; }
  to   { width: 100%; }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

@keyframes heartbeat {
  0%   { transform: scale(1); }
  14%  { transform: scale(1.3); }
  28%  { transform: scale(1); }
  42%  { transform: scale(1.2); }
  70%  { transform: scale(1); }
}

/* ─── SCROLL REVEAL SYSTEM ────────────────────────────────────────────────────
   Elements with [data-reveal] start hidden.
   IntersectionObserver in utils.js adds .revealed when in viewport.
----------------------------------------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slower) var(--ease-out),
              transform var(--dur-slower) var(--ease-out);
}

[data-reveal="left"] {
  transform: translateX(-24px);
}

[data-reveal="right"] {
  transform: translateX(24px);
}

[data-reveal="scale"] {
  transform: scale(0.96);
}

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

/* Stagger children within a container */
[data-reveal-group] > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

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

[data-reveal].revealed,
[data-reveal-group].revealed > * {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* ─── SILK THREAD UNDERLINE ───────────────────────────────────────────────────
   Pearl Veil's signature animation — a fine gold line draws under headings.
   Apply .silk-underline to any heading element.
----------------------------------------------------------------------------- */

.silk-underline {
  position: relative;
  display: inline-block;
}

.silk-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  height: 1px;
  width: 0;
  background-color: var(--color-accent);
  transition: width var(--dur-slower) var(--ease-out);
}

.silk-underline.revealed::after,
.silk-underline:hover::after {
  width: 100%;
}

/* ─── IMAGE HOVER EFFECTS ─────────────────────────────────────────────────────  */

.img-zoom-wrap {
  overflow: hidden;
}

.img-zoom-wrap img {
  transition: transform var(--dur-slower) var(--ease-out);
}

.img-zoom-wrap:hover img {
  transform: scale(1.06);
}

/* ─── PAGE TRANSITION ─────────────────────────────────────────────────────────  */

.page-transition {
  animation: fadeIn var(--dur-slow) var(--ease-out) forwards;
}

/* ─── BUTTON RIPPLE ───────────────────────────────────────────────────────────  */

.btn-ripple {
  position: relative;
  overflow: hidden;
}

.btn-ripple .ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: rgba(255, 255, 255, 0.25);
  animation: rippleEffect 0.5s linear;
  pointer-events: none;
}

@keyframes rippleEffect {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ─── WISHLIST HEART ANIMATION ────────────────────────────────────────────────  */

.btn-wishlist svg {
  transition: transform var(--dur-fast) var(--ease-spring),
              fill var(--dur-fast) var(--ease-out),
              stroke var(--dur-fast) var(--ease-out);
}

.btn-wishlist:active svg {
  transform: scale(1.35);
}

.btn-wishlist.wishlisted svg {
  animation: heartbeat 0.6s var(--ease-spring);
  fill: var(--color-accent);
  stroke: var(--color-accent);
}

/* ─── NAV LINK UNDERLINE ──────────────────────────────────────────────────────  */

.nav-link-underline {
  position: relative;
}

.nav-link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  right: 50%;
  height: 1px;
  background-color: var(--color-accent);
  transition: left var(--dur-base) var(--ease-out),
              right var(--dur-base) var(--ease-out);
}

.nav-link-underline:hover::after,
.nav-link-underline.active::after {
  left: var(--space-4);
  right: var(--space-4);
}

/* ─── LOADING SPINNER ─────────────────────────────────────────────────────────  */

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 1.5px;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* ─── SKELETON LOADING ────────────────────────────────────────────────────────  */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-alt) 25%,
    var(--color-border) 50%,
    var(--color-bg-alt) 75%
  );
  background-size: 200% 100%;
  animation: skeleton 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton-text:last-child {
  width: 70%;
}

/* ─── COUNT UP ANIMATION ──────────────────────────────────────────────────────  */

.count-up {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-spring);
}

/* ─── MARQUEE / TICKER ────────────────────────────────────────────────────────  */

.marquee-wrap {
  overflow: hidden;
  white-space: nowrap;
}

.marquee-track {
  display: inline-flex;
  animation: marquee 20s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}