/* ============================================================
   B5 SERVICES GROUP — ANIMATIONS
   Scroll reveals, count-up, transitions
   ============================================================ */

/* --- Reveal on Scroll (base) --- */
.reveal {
  opacity: 0;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.revealed {
  opacity: 1;
  transform: none !important;
}

/* Directional variants */
.reveal-up    { transform: translateY(32px); }
.reveal-down  { transform: translateY(-32px); }
.reveal-left  { transform: translateX(-32px); }
.reveal-right { transform: translateX(32px); }
.reveal-scale { transform: scale(0.92); }

/* Stagger delays for grid children */
.stagger > *:nth-child(1) { transition-delay: 0ms; }
.stagger > *:nth-child(2) { transition-delay: 80ms; }
.stagger > *:nth-child(3) { transition-delay: 160ms; }
.stagger > *:nth-child(4) { transition-delay: 240ms; }
.stagger > *:nth-child(5) { transition-delay: 320ms; }
.stagger > *:nth-child(6) { transition-delay: 400ms; }

/* Hero content stagger */
.hero-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.hero-stagger.revealed > *:nth-child(1) { opacity: 1; transform: none; transition-delay: 100ms; }
.hero-stagger.revealed > *:nth-child(2) { opacity: 1; transform: none; transition-delay: 250ms; }
.hero-stagger.revealed > *:nth-child(3) { opacity: 1; transform: none; transition-delay: 400ms; }
.hero-stagger.revealed > *:nth-child(4) { opacity: 1; transform: none; transition-delay: 550ms; }

/* Stat count-up */
.stat-count {
  display: inline-block;
}

/* Process step connector animation */
@keyframes lineDraw {
  from { width: 0; }
  to   { width: 80%; }
}

/* Pulse on CTA hover */
.btn-primary::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--radius-md) + 4px);
  border: 2px solid var(--color-magenta);
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.3s, transform 0.3s;
}

.btn-primary {
  position: relative;
}

.btn-primary:hover::before {
  opacity: 0.3;
  transform: scale(1.05);
}

/* Link underline slide */
.link-underline {
  position: relative;
  text-decoration: none;
  color: var(--color-blue);
}

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

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

/* Card hover animation */
.card-hover {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* Number ticker */
@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Page transition */
.page-fade-in {
  animation: pageFadeIn 0.4s ease-out;
}

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

/* Loading skeleton */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

/* Smooth scroll offset for sticky nav */
:target {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}