/* ========================================
   KEYFRAME ANIMATIONS
   ======================================== */

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.3);
  }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes rotateRing {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes floatIcon {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes scrollWheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
  }
}

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

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

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

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(0) translateX(0);
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    opacity: 0;
    transform: translateY(-100vh) translateX(50px);
  }
}

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

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.1);
  }
  50% {
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.2);
  }
}

/* ========================================
   SCROLL ANIMATIONS
   ======================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animations for children */
.animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* ========================================
   HOVER MICRO-INTERACTIONS
   ======================================== */

/* Card glow effect on hover */
.glass-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.glass-card:hover::after {
  opacity: 1;
}

/* Button ripple effect */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transform: scale(0);
  transition: all 0.5s;
}

.btn:active::after {
  opacity: 1;
  transform: scale(2.5);
  transition: 0s;
}

/* Link underline animation */
.nav-link {
  position: relative;
}

/* Icon bounce on hover */
.about-card:hover .about-card-icon,
.contact-card:hover .contact-icon {
  animation: floatIcon 0.6s ease-in-out;
}

/* Skill bar shimmer */
.skill-bar-fill.animated::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  background-size: 200% 100%;
  animation: shimmer 2s ease-in-out infinite;
}

/* Timeline card entrance */
.timeline-item.visible .timeline-card {
  animation: fadeInLeft 0.6s ease-out both;
}

.timeline-item:nth-child(even).visible .timeline-card {
  animation: fadeInRight 0.6s ease-out both;
}

/* Parallax-like subtle movement */
@media (prefers-reduced-motion: no-preference) {
  .hero-visual {
    transition: transform 0.3s ease-out;
  }
}

/* Loading animation */
@keyframes loadingBar {
  0% { width: 0; }
  100% { width: var(--target-width); }
}