/* ============================================================
   SPARK4BRAND — Premium Animation System
   Apple-grade motion: restrained, purposeful, GPU-accelerated
   ============================================================ */

/* ── Base reveal state ──────────────────────────────────────── */
.s4b-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.72s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.72s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.s4b-reveal.s4b-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for child elements */
.s4b-reveal-stagger > *:nth-child(1) { transition-delay: 0s; }
.s4b-reveal-stagger > *:nth-child(2) { transition-delay: 0.08s; }
.s4b-reveal-stagger > *:nth-child(3) { transition-delay: 0.16s; }
.s4b-reveal-stagger > *:nth-child(4) { transition-delay: 0.24s; }
.s4b-reveal-stagger > *:nth-child(5) { transition-delay: 0.32s; }
.s4b-reveal-stagger > *:nth-child(6) { transition-delay: 0.40s; }
.s4b-reveal-stagger > *:nth-child(7) { transition-delay: 0.48s; }
.s4b-reveal-stagger > *:nth-child(8) { transition-delay: 0.56s; }

.s4b-reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.s4b-reveal-stagger.s4b-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Slide-in from left */
.s4b-reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.72s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.72s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.s4b-reveal-left.s4b-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Slide-in from right */
.s4b-reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity 0.72s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.72s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.s4b-reveal-right.s4b-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale-in (for cards and feature blocks) */
.s4b-reveal-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.s4b-reveal-scale.s4b-visible {
  opacity: 1;
  transform: scale(1);
}

/* ── Navigation: frosted glass on scroll ────────────────────── */
nav,
header nav,
.navbar,
.nav-container {
  transition: background 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              backdrop-filter 0.4s ease,
              box-shadow 0.4s ease;
}

nav.s4b-nav-scrolled,
header nav.s4b-nav-scrolled,
.navbar.s4b-nav-scrolled,
.nav-container.s4b-nav-scrolled {
  background: rgba(10, 15, 30, 0.82) !important;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* ── CTA Button: magnetic lift effect ───────────────────────── */
.btn-primary,
.cta-button,
a.btn,
button.btn-primary {
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.3s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.25s ease !important;
  transform-origin: center center;
}

.btn-primary:hover,
.cta-button:hover,
a.btn:hover,
button.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 32px rgba(212, 175, 55, 0.35), 0 4px 12px rgba(0, 0, 0, 0.3) !important;
}

.btn-primary:active,
.cta-button:active,
a.btn:active,
button.btn-primary:active {
  transform: translateY(-1px) scale(0.99);
  transition-duration: 0.1s;
}

/* ── Card hover: subtle lift ────────────────────────────────── */
.service-card,
.value-card,
.feature-card,
.pricing-card,
.booster-card,
.consultation-card,
.timeline-item,
.process-step {
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.4s cubic-bezier(0.22, 1, 0.36, 1) !important;
}

.service-card:hover,
.value-card:hover,
.feature-card:hover,
.pricing-card:hover,
.booster-card:hover,
.consultation-card:hover,
.process-step:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(212, 175, 55, 0.12) !important;
}

/* ── Stat counters ──────────────────────────────────────────── */
.s4b-stat-number {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* ── Page transition: smooth entry ─────────────────────────── */
body {
  animation: s4b-page-enter 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes s4b-page-enter {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ── Link hover: underline slide ───────────────────────────── */
.nav-link,
nav a,
.footer-link {
  position: relative;
}

.nav-link::after,
nav a:not(.btn):not(.cta-button)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: #d4af37;
  transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-link:hover::after,
nav a:not(.btn):not(.cta-button):hover::after {
  width: 100%;
}

/* ── Section divider line animate ──────────────────────────── */
.s4b-line-reveal {
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #d4af37, transparent);
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.s4b-line-reveal.s4b-visible {
  width: 80px;
}

/* ── Image: subtle zoom on hover ───────────────────────────── */
.s4b-img-hover {
  overflow: hidden;
}

.s4b-img-hover img {
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.s4b-img-hover:hover img {
  transform: scale(1.04);
}

/* ── Reduce motion: respect user preference ─────────────────── */
@media (prefers-reduced-motion: reduce) {
  .s4b-reveal,
  .s4b-reveal-left,
  .s4b-reveal-right,
  .s4b-reveal-scale,
  .s4b-reveal-stagger > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  body {
    animation: none !important;
  }

  .btn-primary:hover,
  .cta-button:hover,
  .service-card:hover,
  .value-card:hover {
    transform: none !important;
  }
}