/* ==========================================
   ANIMATION STYLES - dharambhushan.com
   Micro-interactions and scroll effects
   ========================================== */

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@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 slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

  50% {
    opacity: 0.7;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }

  100% {
    background-position: 1000px 0;
  }
}

/* ==========================================
   SCROLL REVEAL ANIMATIONS
   ========================================== */

/* Elements hidden until scrolled into view */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-50px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

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

.reveal-right {
  opacity: 0;
  transform: translateX(50px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

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

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

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

/* Staggered animations */
.stagger-1 {
  transition-delay: 0.1s;
}

.stagger-2 {
  transition-delay: 0.2s;
}

.stagger-3 {
  transition-delay: 0.3s;
}

.stagger-4 {
  transition-delay: 0.4s;
}

.stagger-5 {
  transition-delay: 0.5s;
}

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

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.site-header {
  animation: fadeInDown 0.6s ease-out;
}

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

/* Smooth lift effect */
.lift-effect {
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.lift-effect:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Glow effect on hover */
.glow-effect {
  position: relative;
  transition: all var(--transition-base);
}

.glow-effect::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: linear-gradient(45deg, var(--color-primary), var(--aws-light-blue));
  border-radius: inherit;
  opacity: 0;
  z-index: -1;
  transition: opacity var(--transition-base);
  filter: blur(10px);
}

.glow-effect:hover::before {
  opacity: 0.3;
}

/* Scale on hover */
.scale-effect {
  transition: transform var(--transition-base);
}

.scale-effect:hover {
  transform: scale(1.05);
}

/* ==========================================
   BUTTON ANIMATIONS
   ========================================== */

.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgb(255 255 255 / 20%);
  transform: translate(-50%, -50%);
  transition:
    width 0.6s,
    height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

/* ==========================================
   LOADING ANIMATIONS
   ========================================== */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface) 0%,
    var(--color-border) 50%,
    var(--color-surface) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--border-radius);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ==========================================
   SECTION TRANSITIONS
   ========================================== */

.section {
  opacity: 0;
  animation: fadeIn 0.8s ease-out forwards;
}

.section:nth-child(1) {
  animation-delay: 0.1s;
}

.section:nth-child(2) {
  animation-delay: 0.2s;
}

.section:nth-child(3) {
  animation-delay: 0.3s;
}

.section:nth-child(4) {
  animation-delay: 0.4s;
}

.section:nth-child(5) {
  animation-delay: 0.5s;
}

/* ==========================================
   CARD ANIMATIONS
   ========================================== */

.card {
  animation: scaleIn 0.5s ease-out;
}

.card:hover .card-title {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

/* Flip effect for project cards */
.flip-card {
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  backface-visibility: hidden;
}

.flip-card-back {
  transform: rotateY(180deg);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ==========================================
   TEXT ANIMATIONS
   ========================================== */

/* Typewriter effect (optional) */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  border-right: 3px solid var(--color-primary);
  animation:
    typing 3.5s steps(40, end),
    blink-caret 0.75s step-end infinite;
}

@keyframes typing {
  from {
    width: 0;
  }

  to {
    width: 100%;
  }
}

@keyframes blink-caret {
  0%,
  100% {
    border-color: transparent;
  }

  50% {
    border-color: var(--color-primary);
  }
}

/* Gradient text animation */
.gradient-text {
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--aws-light-blue),
    var(--color-primary)
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
  0%,
  100% {
    background-position: 0% center;
  }

  50% {
    background-position: 100% center;
  }
}

/* ==========================================
   LINK UNDERLINE ANIMATION
   ========================================== */

.animated-link {
  position: relative;
  display: inline-block;
}

.animated-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.animated-link:hover::after {
  width: 100%;
}

/* ==========================================
   PROGRESS BAR ANIMATION
   ========================================== */

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  transform: translateX(-100%);
  animation: progressFill 2s ease-out forwards;
}

@keyframes progressFill {
  to {
    transform: translateX(0);
  }
}

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

/* Respect user's motion preferences */
@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;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .reveal-scale {
    opacity: 1;
    transform: none;
  }
}