/* ==========================================================================
   TechProGigs Prime Motion Design Engine
   Reference Architecture: Netguru (https://www.netguru.com/)
   High-performance, GPU-accelerated motion choreography with accessibility fallback.
   ========================================================================== */

:root {
  /* Netguru-matched Easing Curves */
  --ng-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ng-ease-slow-in: cubic-bezier(0.4, 0, 0.1, 1);
  --ng-ease-out-cubic: cubic-bezier(0.33, 1, 0.68, 1);
  --ng-ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Duration Tokens */
  --ng-dur-fast: 0.2s;
  --ng-dur-base: 0.5s;
  --ng-dur-reveal: 0.8s;
  --ng-dur-slow: 1.1s;
}

/* --------------------------------------------------------------------------
   1. Scroll Progress Bar (Top of sticky header)
   -------------------------------------------------------------------------- */
.tpg-scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--tpg-accent) 0%, #D97706 100%);
  transition: width 0.1s linear;
  z-index: 1001;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   2. Sticky Header Glassmorphism & Elevation
   -------------------------------------------------------------------------- */
.tpg-header {
  transition: padding 0.35s var(--ng-ease), background-color 0.35s var(--ng-ease), box-shadow 0.35s var(--ng-ease), border-color 0.35s var(--ng-ease);
}

.tpg-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.92) !important;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--tpg-border) !important;
  box-shadow: 0 4px 20px rgba(15, 20, 18, 0.05);
}

/* --------------------------------------------------------------------------
   3. Scroll Reveal Engine (IntersectionObserver)
   -------------------------------------------------------------------------- */
.tpg-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--ng-dur-reveal) var(--ng-ease), transform var(--ng-dur-reveal) var(--ng-ease);
  will-change: opacity, transform;
}

.tpg-reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity var(--ng-dur-reveal) var(--ng-ease), transform var(--ng-dur-reveal) var(--ng-ease);
  will-change: opacity, transform;
}

.tpg-reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity var(--ng-dur-reveal) var(--ng-ease), transform var(--ng-dur-reveal) var(--ng-ease);
  will-change: opacity, transform;
}

.tpg-reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--ng-dur-reveal) var(--ng-ease), transform var(--ng-dur-reveal) var(--ng-ease);
  will-change: opacity, transform;
}

.tpg-reveal.is-inview,
.tpg-reveal-left.is-inview,
.tpg-reveal-right.is-inview,
.tpg-reveal-scale.is-inview {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

/* Stagger Children in Grids */
.tpg-stagger-parent .tpg-reveal:nth-child(1) { transition-delay: 0.05s; }
.tpg-stagger-parent .tpg-reveal:nth-child(2) { transition-delay: 0.12s; }
.tpg-stagger-parent .tpg-reveal:nth-child(3) { transition-delay: 0.19s; }
.tpg-stagger-parent .tpg-reveal:nth-child(4) { transition-delay: 0.26s; }
.tpg-stagger-parent .tpg-reveal:nth-child(5) { transition-delay: 0.33s; }
.tpg-stagger-parent .tpg-reveal:nth-child(6) { transition-delay: 0.40s; }
.tpg-stagger-parent .tpg-reveal:nth-child(7) { transition-delay: 0.47s; }
.tpg-stagger-parent .tpg-reveal:nth-child(8) { transition-delay: 0.54s; }

/* --------------------------------------------------------------------------
   4. Netguru Card Interactive Hover Motion
   -------------------------------------------------------------------------- */
.tpg-service-card,
.tpg-industry-card,
.tpg-card,
.tpg-model-card {
  transition: transform 0.4s var(--ng-ease), box-shadow 0.4s var(--ng-ease), border-color 0.4s var(--ng-ease);
  will-change: transform, box-shadow;
}

.tpg-service-card:hover,
.tpg-industry-card:hover,
.tpg-card:hover,
.tpg-model-card:hover {
  transform: translateY(-6px);
  border-color: var(--tpg-accent);
  box-shadow: 0 16px 36px rgba(15, 20, 18, 0.08);
}

/* Card Icon Scale */
.tpg-service-card .tpg-service-icon,
.tpg-industry-card .tpg-industry-icon {
  transition: transform 0.35s var(--ng-ease), background-color 0.35s var(--ng-ease);
}

.tpg-service-card:hover .tpg-service-icon,
.tpg-industry-card:hover .tpg-industry-icon {
  transform: scale(1.08);
  background-color: rgba(127, 131, 117, 0.22);
}

/* Card Arrow Translation */
.tpg-service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.25s var(--ng-ease);
}

.tpg-service-link svg,
.tpg-service-link span.arrow {
  display: inline-block;
  transition: transform 0.25s var(--ng-ease);
}

.tpg-service-card:hover .tpg-service-link svg,
.tpg-service-card:hover .tpg-service-link span.arrow,
.tpg-industry-card:hover .tpg-service-link svg,
.tpg-industry-card:hover .tpg-service-link span.arrow {
  transform: translateX(5px);
}

/* --------------------------------------------------------------------------
   5. Interactive Engineering Pipeline Dynamic Highlighting
   -------------------------------------------------------------------------- */
.tpg-pipeline-grid {
  position: relative;
}

.tpg-pipeline-step {
  transition: all 0.4s var(--ng-ease);
  position: relative;
}

.tpg-pipeline-step.is-active-step {
  border-color: var(--tpg-accent) !important;
  box-shadow: 0 0 24px rgba(127, 131, 117, 0.25);
  transform: translateY(-4px) scale(1.02);
}

.tpg-pipeline-step.is-active-step .tpg-pipeline-num {
  background-color: var(--tpg-accent);
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   6. Button Feedback & Micro-Interactions
   -------------------------------------------------------------------------- */
.tpg-btn {
  transition: transform 0.25s var(--ng-ease), box-shadow 0.25s var(--ng-ease), background-color 0.25s var(--ng-ease), color 0.25s var(--ng-ease);
  will-change: transform;
}

.tpg-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(127, 131, 117, 0.28);
}

.tpg-btn:active {
  transform: translateY(0) scale(0.98);
}

/* --------------------------------------------------------------------------
   7. Accessibility: Reduced Motion Override
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transform: none !important;
  }
  .tpg-reveal,
  .tpg-reveal-left,
  .tpg-reveal-right,
  .tpg-reveal-scale {
    opacity: 1 !important;
    transform: none !important;
  }
  .tpg-scroll-progress {
    display: none !important;
  }
}