/* ============================================
   PERFObuzz — animations.css
   Scroll effects, hover animations, transitions
   ============================================ */

/* ============================================
   1. SCROLL REVEAL (IntersectionObserver-driven)
   ============================================ */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Staggered children within revealed containers */
[data-reveal] > * {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Slight delay variants */
[data-reveal-delay="1"] { transition-delay: 0.1s; }
[data-reveal-delay="2"] { transition-delay: 0.2s; }
[data-reveal-delay="3"] { transition-delay: 0.3s; }
[data-reveal-delay="4"] { transition-delay: 0.4s; }

/* ============================================
   2. BENTO CARD STAGGER
   ============================================ */

.bento-card[data-reveal] {
  transition-delay: calc(var(--bento-index, 0) * 0.1s);
}

/* ============================================
   3. HERO ENTRANCE ANIMATIONS
   ============================================ */

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-tag {
  animation: heroFadeUp 0.8s ease 0.2s both;
}

.hero-heading {
  animation: heroFadeUp 0.8s ease 0.4s both;
}

.hero-sub {
  animation: heroFadeUp 0.8s ease 0.6s both;
}

.hero-cta {
  animation: heroFadeUp 0.8s ease 0.8s both;
}

.hero-micro {
  animation: heroFadeUp 0.8s ease 1s both;
}

/* ============================================
   4. INFINITE MARQUEE / CAROUSEL
   ============================================ */

/* ============================================
   4. (removed) INFINITE MARQUEE — feature not used on this page
   ============================================ */

/* ============================================
   5. VERTICAL CARD STACKING
   Positioning/z-index handled in layout.css + stacking.js.
   (The old animation-timeline: view() shrink was removed — it dimmed
   and scaled cards while they were still fully in view, which read as a
   rendering bug. The clean sticky-deck overlap now carries the effect.)
   ============================================ */

/* ============================================
   6. HOVER EFFECTS
   ============================================ */

/* Link underline animation */
.link-underline {
  position: relative;
  display: inline-block;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--transition-base);
}

.link-underline:hover::after {
  width: 100%;
}

/* Card glow on hover */
.card-glow {
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card-glow:hover {
  box-shadow: var(--shadow-glow);
  border-color: var(--accent);
}

/* ============================================
   7. BUTTON MICRO-ANIMATIONS
   ============================================ */

.btn .icon {
  transition: transform var(--transition-fast);
}

.btn:hover .icon {
  transform: translateX(2px);
}

.btn-ghost:hover .icon,
.btn-outline:hover .icon {
  transform: translateX(0);
}

/* ============================================
   8. NAV SCROLL TRANSITION
   ============================================ */

.site-header {
  transition: background var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
}

/* ============================================
   9. FAQ ACCORDION ANIMATION
   ============================================ */

.faq-item > p {
  animation: faqOpen 0.3s ease;
}

@keyframes faqOpen {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   10. FORM STEP TRANSITIONS
   ============================================ */

.form-step {
  animation: formStepIn 0.35s ease;
}

@keyframes formStepIn {
  from {
    opacity: 0;
    transform: translateX(16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.form-step.is-back {
  animation: formStepBack 0.35s ease;
}

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

/* ============================================
   11. PROGRESS BAR ANIMATION
   ============================================ */

.form-progress-fill {
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   12. IMAGE SCALE ON HOVER
   ============================================ */

.stack-card-image img {
  transition: transform var(--transition-slow);
}

.stack-card:hover .stack-card-image img {
  transform: scale(1.04);
}

/* ============================================
   13. PREFERS-REDUCED-MOTION FALLBACKS
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-tag,
  .hero-heading,
  .hero-sub,
  .hero-cta,
  .hero-micro {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .stack-card {
    animation: none;
    position: static;
    transform: none;
    opacity: 1;
  }

  .faq-item > p {
    animation: none;
  }

  .form-step {
    animation: none;
  }
}

/* ============================================
   14. LOADING / SKELETON STATE
   ============================================ */

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

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-surface) 25%,
    var(--slate) 50%,
    var(--bg-surface) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* ============================================
   15. SUCCESS CHECK ANIMATION
   ============================================ */

@keyframes checkPop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  60% {
    transform: scale(1.15);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.form-success-icon {
  animation: checkPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s both;
}

.form-success-title {
  animation: heroFadeUp 0.5s ease 0.4s both;
}

.form-success-desc {
  animation: heroFadeUp 0.5s ease 0.55s both;
}

.form-success-social {
  animation: heroFadeUp 0.5s ease 0.7s both;
}

/* ============================================
   16. ABOUT IMAGE REVEAL
   ============================================ */

.about-image {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.about-image.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.about-image-accent {
  animation: accentPulse 4s ease-in-out infinite;
}

@keyframes accentPulse {
  0%, 100% {
    opacity: 0.2;
  }
  50% {
    opacity: 0.35;
  }
}

/* ============================================
   17. NAV LINK ACTIVE INDICATOR
   ============================================ */

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 60%;
}

/* ============================================
   18. HERO BACKGROUND SUBTLE ZOOM
   ============================================ */

@keyframes heroBgZoom {
  from {
    transform: scale(1.05);
  }
  to {
    transform: scale(1);
  }
}

.hero-bg img {
  animation: heroBgZoom 8s ease-out forwards;
}

@media (prefers-reduced-motion: reduce) {
  .hero-bg img {
    animation: none;
    transform: scale(1);
  }
  
  .about-image-accent {
    animation: none;
    opacity: 0.25;
  }
}