/*
 * Dentistry 442 — animations.css
 * GPU-composited animations using transform & opacity only.
 * No layout-triggering properties (width, height, top, left).
 *
 * @package Dentistry442
 * @version 1.0.0
 */

/* =========================================================================
   FADE IN — base class triggered by IntersectionObserver in main.js
   ========================================================================= */

[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  will-change: opacity, transform;
}

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

/* Delay utilities */
[data-animate-delay="100"] { transition-delay: 100ms; }
[data-animate-delay="150"] { transition-delay: 150ms; }
[data-animate-delay="200"] { transition-delay: 200ms; }
[data-animate-delay="250"] { transition-delay: 250ms; }
[data-animate-delay="300"] { transition-delay: 300ms; }
[data-animate-delay="400"] { transition-delay: 400ms; }
[data-animate-delay="500"] { transition-delay: 500ms; }
[data-animate-delay="600"] { transition-delay: 600ms; }
[data-animate-delay="700"] { transition-delay: 700ms; }
[data-animate-delay="800"] { transition-delay: 800ms; }

/* Direction variants */
[data-animate="fade-up"]   { transform: translateY(32px); }
[data-animate="fade-down"] { transform: translateY(-32px); }
[data-animate="fade-left"] { transform: translateX(32px); }
[data-animate="fade-right"]{ transform: translateX(-32px); }
[data-animate="zoom-in"]   { transform: scale(0.92); }
[data-animate="zoom-out"]  { transform: scale(1.08); }

[data-animate].is-visible  { transform: none; }

/* =========================================================================
   STAGGER CHILDREN — parent triggers stagger on child [data-stagger] items
   ========================================================================= */

[data-stagger-parent] [data-stagger] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-out),
              transform 0.5s var(--ease-out);
  will-change: opacity, transform;
}

/* JS adds .is-visible to each child individually via setTimeout — match that behaviour */
[data-stagger-parent] [data-stagger].is-visible { opacity: 1; transform: none; }

/* =========================================================================
   COUNTER ANIMATION — triggered by JS when element enters viewport
   ========================================================================= */

.stat-item__number {
  transition: color var(--duration-base);
}

.stat-item__number.is-counting {
  color: var(--teal-light);
}

/* =========================================================================
   HERO ENTRANCE — sequenced via CSS animation-delay
   ========================================================================= */

.hero__tag,
.hero__title,
.hero__subtitle,
.hero__ctas,
.hero__badges {
  animation: d442-hero-rise 0.8s var(--ease-out) both;
}

.hero__tag     { animation-delay: 0.1s; }
.hero__title   { animation-delay: 0.25s; }
.hero__subtitle{ animation-delay: 0.40s; }
.hero__ctas    { animation-delay: 0.55s; }
.hero__badges  { animation-delay: 0.70s; }

@keyframes d442-hero-rise {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   CARD HOVER SHIMMER
   ========================================================================= */

.treatment-card,
.team-card,
.d442-card {
  position: relative;
  overflow: hidden;
}

.treatment-card::before,
.team-card::before,
.d442-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    to right,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,0.06) 50%,
    rgba(255,255,255,0) 100%
  );
  transform: skewX(-15deg);
  pointer-events: none;
  z-index: 1;
  transition: left 0s;
}

.treatment-card:hover::before,
.team-card:hover::before,
.d442-card:hover::before {
  left: 125%;
  transition: left 0.6s var(--ease-out);
}

/* =========================================================================
   SCROLL REVEAL — section separators
   ========================================================================= */

.section-divider {
  width: 0;
  height: 3px;
  background: var(--gradient-teal);
  border-radius: var(--radius-full);
  margin: var(--space-4) auto;
  transition: width var(--duration-slow) var(--ease-out);
}

.section-divider.is-visible { width: 80px; }

/* =========================================================================
   FLOATING BADGE ANIMATION (hero)
   ========================================================================= */

.trust-badge {
  animation: d442-badge-float 4s ease-in-out infinite;
}

.trust-badge:nth-child(2) { animation-delay: 0.4s; }
.trust-badge:nth-child(3) { animation-delay: 0.8s; }
.trust-badge:nth-child(4) { animation-delay: 1.2s; }
.trust-badge:nth-child(5) { animation-delay: 1.6s; }

@keyframes d442-badge-float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-4px); }
}

/* =========================================================================
   STICKY CTA — slide up animation
   ========================================================================= */

.sticky-cta-bar {
  animation: none; /* JS adds/removes .is-visible */
}

/* =========================================================================
   PAGE TRANSITION OVERLAY (optional enhancement)
   ========================================================================= */

.page-transition-overlay {
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}

.page-transition-overlay.is-entering {
  opacity: 1;
  pointer-events: all;
}

/* =========================================================================
   SKELETON LOADING STATES
   ========================================================================= */

@keyframes d442-skeleton {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--grey-200) 25%,
    var(--grey-100) 50%,
    var(--grey-200) 75%
  );
  background-size: 200% 100%;
  animation: d442-skeleton 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

/* =========================================================================
   FOCUS RING ANIMATION
   ========================================================================= */

:focus-visible {
  animation: d442-focus-ring var(--duration-fast) var(--ease-out) forwards;
}

@keyframes d442-focus-ring {
  from { outline-offset: 0px; }
  to   { outline-offset: 3px; }
}

/* =========================================================================
   REDUCED MOTION — override all animations
   ========================================================================= */

@media (prefers-reduced-motion: reduce) {
  [data-animate],
  [data-stagger-parent] [data-stagger],
  .hero__tag,
  .hero__title,
  .hero__subtitle,
  .hero__ctas,
  .hero__badges,
  .trust-badge,
  .treatment-card::before,
  .team-card::before,
  .d442-card::before {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  .section-divider { width: 80px; }
}