/* ==========================================================================
   TechVent Labs — Animations & Motion
   ========================================================================== */

/* ==========================================================================
   KEYFRAMES
   ========================================================================== */

@keyframes tvl-fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes tvl-slide-right {
  from { opacity: 0; transform: translateX(-24px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes tvl-scale-in {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes tvl-marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@keyframes tvl-pulse {
  0%   { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.5); opacity: 0; }
}

@keyframes tvl-border-sweep {
  from { clip-path: inset(0 100% 0 0); }
  to   { clip-path: inset(0 0% 0 0); }
}

@keyframes tvl-glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 201, 177, 0.2); }
  50%       { box-shadow: 0 0 40px rgba(0, 201, 177, 0.4); }
}

@keyframes tvl-float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-8px); }
}

@keyframes tvl-spin-slow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ==========================================================================
   SCROLL-TRIGGERED REVEAL (via IntersectionObserver in main.js)
   ========================================================================== */

/* Elements start hidden and get .tvl-visible when in viewport */
.tvl-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.65s var(--tvl-ease-out),
    transform 0.65s var(--tvl-ease-out);
}

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

/* Staggered children */
.tvl-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.55s var(--tvl-ease-out),
    transform 0.55s var(--tvl-ease-out);
}

.tvl-stagger.tvl-visible > *:nth-child(1) { transition-delay: 0ms; }
.tvl-stagger.tvl-visible > *:nth-child(2) { transition-delay: 80ms; }
.tvl-stagger.tvl-visible > *:nth-child(3) { transition-delay: 160ms; }
.tvl-stagger.tvl-visible > *:nth-child(4) { transition-delay: 240ms; }
.tvl-stagger.tvl-visible > *:nth-child(5) { transition-delay: 320ms; }
.tvl-stagger.tvl-visible > *:nth-child(6) { transition-delay: 400ms; }
.tvl-stagger.tvl-visible > *:nth-child(n+7) { transition-delay: 480ms; }

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

/* Slide from left */
.tvl-reveal--left {
  opacity: 0;
  transform: translateX(-32px);
  transition:
    opacity 0.65s var(--tvl-ease-out),
    transform 0.65s var(--tvl-ease-out);
}

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

/* Scale in */
.tvl-reveal--scale {
  opacity: 0;
  transform: scale(0.94);
  transition:
    opacity 0.6s var(--tvl-ease-out),
    transform 0.6s var(--tvl-ease-out);
}

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

/* ==========================================================================
   HERO PAGE LOAD ANIMATIONS
   ========================================================================== */

.tvl-hero__eyebrow {
  animation: tvl-fade-up 0.7s var(--tvl-ease-out) 0.1s both;
}

.tvl-hero__title {
  animation: tvl-fade-up 0.75s var(--tvl-ease-out) 0.2s both;
}

.tvl-hero__subtitle {
  animation: tvl-fade-up 0.7s var(--tvl-ease-out) 0.35s both;
}

.tvl-hero__cta {
  animation: tvl-fade-up 0.65s var(--tvl-ease-out) 0.5s both;
}

.tvl-hero__stats {
  animation: tvl-fade-up 0.65s var(--tvl-ease-out) 0.65s both;
}

.tvl-hero__image {
  animation: tvl-scale-in 0.9s var(--tvl-ease-out) 0.3s both;
}

/* ==========================================================================
   CARD HOVER EFFECTS
   ========================================================================== */

/* Teal border sweep on hover */
.tvl-card--sweep {
  position: relative;
  overflow: hidden;
}

.tvl-card--sweep::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tvl-teal), var(--tvl-saffron));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--tvl-ease);
}

.tvl-card--sweep:hover::after { transform: scaleX(1); }

/* Glow pulse on hover */
.tvl-card--glow:hover {
  animation: tvl-glow-pulse 1.5s ease-in-out infinite;
}

/* ==========================================================================
   UTILITY ANIMATIONS
   ========================================================================== */

.tvl-animate-float {
  animation: tvl-float 3s ease-in-out infinite;
}

.tvl-animate-glow {
  animation: tvl-glow-pulse 2s ease-in-out infinite;
}

.tvl-animate-spin-slow {
  animation: tvl-spin-slow 8s linear infinite;
}

/* ==========================================================================
   SECTION TRANSITIONS — Diagonal clip-path reveals
   ========================================================================== */

.tvl-section-reveal {
  opacity: 0;
  clip-path: polygon(0 4%, 100% 0, 100% 100%, 0 100%);
  transition:
    opacity 0.8s var(--tvl-ease-out),
    clip-path 0.8s var(--tvl-ease-out);
}

.tvl-section-reveal.tvl-visible {
  opacity: 1;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

/* ==========================================================================
   LOADING STATE (skeleton shimmer)
   ========================================================================== */

@keyframes tvl-shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position: 600px 0; }
}

.tvl-skeleton {
  background: linear-gradient(
    90deg,
    var(--tvl-surface) 25%,
    var(--tvl-surface-2) 50%,
    var(--tvl-surface) 75%
  );
  background-size: 600px 100%;
  animation: tvl-shimmer 1.4s ease infinite;
  border-radius: var(--tvl-radius);
}

/* ==========================================================================
   REDUCE MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .tvl-reveal,
  .tvl-stagger > *,
  .tvl-reveal--left,
  .tvl-reveal--scale {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}