/* ============================================================
   ANIMATIONS.CSS — Summerville Concrete Co.
   Scroll reveals, hero keyframes, transitions
   ============================================================ */

/* ════════════════════════════════════════════════════════
   HERO ENTRANCE KEYFRAMES
   ════════════════════════════════════════════════════════ */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ════════════════════════════════════════════════════════
   SCROLL REVEAL — BASE STATES (hidden)
   ════════════════════════════════════════════════════════ */
.reveal-fade {
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}

.reveal-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

/* ── Visible states (added by IntersectionObserver) ─── */
.reveal-fade.is-visible {
  opacity: 1;
}

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

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

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

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

/* ════════════════════════════════════════════════════════
   COUNTER ANIMATION (JS-driven, no CSS needed beyond base)
   ════════════════════════════════════════════════════════ */

/* ════════════════════════════════════════════════════════
   GALLERY TRACK TRANSITIONS
   (set in layout.css via .gallery-track transition)
   ════════════════════════════════════════════════════════ */

/* ════════════════════════════════════════════════════════
   TAB PANEL TRANSITION
   ════════════════════════════════════════════════════════ */
@keyframes tab-fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tab-panel.active {
  animation: tab-fade-in 0.35s var(--ease-out) forwards;
}

/* ════════════════════════════════════════════════════════
   GLOW PULSE (accent elements)
   ════════════════════════════════════════════════════════ */
@keyframes glow-pulse {
  0%, 100% { box-shadow: var(--glow-accent-sm); }
  50%       { box-shadow: var(--glow-accent); }
}

.glow-pulse {
  animation: glow-pulse 2.5s ease-in-out infinite;
}

/* ════════════════════════════════════════════════════════
   NAV ENTRANCE
   ════════════════════════════════════════════════════════ */
#nav {
  animation: fade-down 0.6s var(--ease-out) 0.1s both;
}