/* ============================================
   Gautam Yadav Portfolio — Animations
   ============================================ */

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.02); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(51, 161, 255, 0.1); }
  50% { box-shadow: 0 0 40px rgba(51, 161, 255, 0.25); }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 500ms; }

/* Hero entrance */
.hero-content {
  animation: fadeInUp 0.8s ease-out forwards;
}

.hero-stats {
  animation: fadeInUp 0.8s ease-out 0.2s forwards;
  opacity: 0;
}

.hero-terminal {
  animation: fadeInUp 0.8s ease-out 0.4s forwards;
  opacity: 0;
}

/* Hover lift effect */
.glass-card {
  will-change: transform;
}

.glass-card:hover {
  transform: translateY(-4px);
}

.about-card:hover .about-icon {
  transform: scale(1.1) rotate(5deg);
  transition: transform 0.3s ease;
}

.leadership-card:hover .leadership-number {
  color: rgba(51, 161, 255, 0.15);
  transition: color 0.3s ease;
}

/* Timeline animation */
.timeline-item.reveal.visible .timeline-marker {
  animation: glowPulse 2s ease-in-out infinite;
}

/* Skill bar shimmer on fill */
.skill-fill.animated {
  position: relative;
  overflow: hidden;
}

.skill-fill.animated::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
}

/* Architecture node pulse */
.arch-node.highlight {
  animation: glowPulse 3s ease-in-out infinite;
}

/* Page transition overlay */
.page-transition {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.page-transition.active {
  opacity: 1;
}

/* Nav link underline animation */
.nav-menu a:not(.nav-cta) {
  position: relative;
}

.nav-menu a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--color-brand);
  transform: scaleX(0);
  transition: transform 0.3s ease;
  border-radius: 1px;
}

.nav-menu a:not(.nav-cta):hover::after,
.nav-menu a:not(.nav-cta).active::after {
  transform: scaleX(1);
}

/* Button ripple effect */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 10.01%);
  background-repeat: no-repeat;
  background-position: 50%;
  transform: scale(10);
  opacity: 0;
  transition: transform 0.5s, opacity 0.5s;
}

.btn:active::after {
  transform: scale(0);
  opacity: 0.3;
  transition: 0s;
}

/* Tech pill hover glow */
.tech-pill:hover {
  box-shadow: 0 0 12px rgba(51, 161, 255, 0.2);
}

/* Achievement stat counter glow */
.achievement-stat:hover {
  animation: glowPulse 2s ease-in-out infinite;
}

/* Contact form focus animation */
.form-group input:focus,
.form-group textarea:focus {
  box-shadow: 0 0 0 3px rgba(51, 161, 255, 0.15);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-content,
  .hero-stats,
  .hero-terminal {
    animation: none;
    opacity: 1;
  }

  .glass-card:hover {
    transform: none;
  }
}