/* ============================================================================
   ANIMATIONS & MICRO-INTERACTIONS
   Advanced scroll-triggered animations, hover effects, and transitions
   ============================================================================ */

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

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

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

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

@keyframes slideDownIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes fadeInStaggered {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

/* ============================================================================
   GRADIENT ANIMATIONS
   ============================================================================ */

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.08);
  }
  50% {
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
  }
}

@keyframes glowBreathe {
  0%, 100% {
    text-shadow: 0 0 10px rgba(255, 255, 255, 0), 0 0 20px rgba(255, 255, 255, 0);
  }
  50% {
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1), 0 0 20px rgba(255, 255, 255, 0.05);
  }
}

/* Animated Gradient Text — Premium Black & White flow */
@keyframes gradientTextShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Grain Texture Animation */
@keyframes grain-drift {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(100px, 100px);
  }
}

/* Parallax Scroll Animation */
@keyframes parallaxShift {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-30px);
  }
}

/* Bounce Animation for buttons and icons */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  25% {
    transform: translateY(-8px);
  }
  50% {
    transform: translateY(-12px);
  }
  75% {
    transform: translateY(-4px);
  }
}

/* Subtle float for small icons (continuous, low-amplitude) */
@keyframes iconFloat {
  0% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
  100% { transform: translateY(0); }
}

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

@keyframes buttonHoverGlow {
  0% {
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.1);
  }
  50% {
    box-shadow: 0 0 16px rgba(255, 255, 255, 0.2);
  }
  100% {
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.1);
  }
}

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

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

.nav-link {
  position: relative;
}

.nav-link::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0.5));
  transition: width 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-link:hover::before {
  width: 100%;
}

/* ============================================================================
   PROJECT CARD HOVER MICRO-INTERACTIONS
   ============================================================================ */

.project-card {
  position: relative;
  overflow: hidden;
}

.project-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 500ms ease-in-out;
  pointer-events: none;
}

.project-card:hover::after {
  left: 100%;
}

.project-card .project-tech li {
  position: relative;
  overflow: hidden;
}

.project-card .project-tech li::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: left 400ms ease;
}

.project-card:hover .project-tech li::before {
  left: 100%;
}

/* Staggered animation for tech tags on hover */
.project-card:hover .project-tech li:nth-child(1) {
  animation: revealIn 300ms ease-out;
}

.project-card:hover .project-tech li:nth-child(2) {
  animation: revealIn 300ms ease-out 50ms backwards;
}

.project-card:hover .project-tech li:nth-child(3) {
  animation: revealIn 300ms ease-out 100ms backwards;
}

.project-card:hover .project-tech li:nth-child(4) {
  animation: revealIn 300ms ease-out 150ms backwards;
}

/* ============================================================================
   SKILL ITEM HOVER ANIMATIONS
   ============================================================================ */

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

.skill::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.05), transparent);
  transition: left 500ms ease-in-out;
  pointer-events: none;
}

.skills-group:hover .skill::after {
  left: 100%;
}

/* ============================================================================
   FORM FIELD ANIMATIONS
   ============================================================================ */

.form-row input:focus,
.form-row textarea:focus {
  animation: glowPulse 2s ease-in-out infinite;
}

.form-row input::selection,
.form-row textarea::selection {
  background: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

/* ============================================================================
   EXPERIENCE ITEM HOVER ANIMATIONS
   ============================================================================ */

.experience-item {
  position: relative;
  overflow: hidden;
}

.experience-item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.experience-item:hover::before {
  opacity: 1;
}

.experience-responsibilities li {
  position: relative;
  transition: all var(--transition-base);
}

.experience-item:hover .experience-responsibilities li {
  padding-left: var(--spacing-lg) + 4px;
}

.experience-responsibilities li::before {
  transition: all var(--transition-base);
}

.experience-item:hover .experience-responsibilities li::before {
  color: rgba(255, 255, 255, 0.6);
  transform: scale(1.2);
}

/* ============================================================================
   HEADER SCROLL EFFECTS
   ============================================================================ */

.site-header {
  animation: slideDownIn 400ms ease-out;
}

.site-header.scrolled {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ============================================================================
   STAGGERED LIST ANIMATIONS
   ============================================================================ */

.about-meta li {
  animation: revealIn 500ms ease-out backwards;
}

.about-meta li:nth-child(1) {
  animation-delay: 0ms;
}

.about-meta li:nth-child(2) {
  animation-delay: 100ms;
}

.about-meta li:nth-child(3) {
  animation-delay: 200ms;
}

/* ============================================================================
   SECTION ENTRANCE ANIMATIONS
   ============================================================================ */

.about,
.skills,
.projects,
.experience,
.education,
.contact {
  animation: revealIn 600ms ease-out backwards;
}

.about {
  animation-delay: 0ms;
}

.skills {
  animation-delay: 100ms;
}

.projects {
  animation-delay: 200ms;
}

.experience {
  animation-delay: 300ms;
}

.education {
  animation-delay: 400ms;
}

.contact {
  animation-delay: 500ms;
}

/* ============================================================================
   PROJECT CARD STAGGERED GRID ANIMATIONS
   ============================================================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--spacing-2xl);
}

.project-card {
  animation: scaleIn 600ms ease-out backwards;
}

.project-card:nth-child(1) {
  animation-delay: 0ms;
}

.project-card:nth-child(2) {
  animation-delay: 150ms;
}

.project-card:nth-child(3) {
  animation-delay: 300ms;
}

/* ============================================================================
   SKILLS GROUP ANIMATIONS
   ============================================================================ */

.skills-group {
  animation: revealInLeft 500ms ease-out backwards;
}

.skills-group:nth-child(1) {
  animation-delay: 0ms;
}

.skills-group:nth-child(2) {
  animation-delay: 100ms;
}

.skills-group:nth-child(3) {
  animation-delay: 200ms;
}

/* ============================================================================
   CHECKBOX & FOCUS ANIMATIONS
   ============================================================================ */

input:focus,
textarea:focus {
  outline: none;
}

input:focus-visible,
textarea:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.3);
  outline-offset: 2px;
}

/* ============================================================================
   TEXT GRADIENT & GLOW EFFECTS
   ============================================================================ */

.hero-title {
  background: linear-gradient(135deg, #ffffff 0%, #d1d1d1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================================
   LOADING & TRANSITION STATES
   ============================================================================ */

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

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

/* ============================================================================
   SMOOTH LINK TRANSITIONS
   ============================================================================ */

a {
  position: relative;
  transition: color var(--transition-base);
}

a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--transition-base);
}

.meta-item a:hover::after,
.contact-item a:hover::after {
  width: 100%;
}

/* ============================================================================
   BACKDROP EFFECTS
   ============================================================================ */

.site-header {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.contact-form {
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

/* ============================================================================
   DARK MODE & CONTRAST ENHANCEMENTS
   ============================================================================ */

@media (prefers-color-scheme: dark) {
  body {
    background-color: #000000;
    color: #f7f7f7;
  }
}

/* ============================================================================
   ENHANCE ANIMATIONS FOR FASTER CONNECTIONS
   ============================================================================ */

@media (prefers-reduced-motion: no-preference) {
  /* Smooth scrolling for navigation anchors */
  html {
    scroll-behavior: smooth;
  }

  /* Enhanced button hover animations */
  .btn:hover {
    animation: glowPulse 1s ease-in-out infinite;
  }

  /* Project card hover glow */
  .project-card:hover {
    animation: glowPulse 2s ease-in-out infinite;
  }
}

/* ============================================================================
   KEYBOARD NAVIGATION HIGHLIGHTS
   ============================================================================ */

.nav-link:focus-visible,
.btn:focus-visible,
.project-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.4);
  outline-offset: 3px;
}

/* ============================================================================
   TAB FOCUS STATES
   ============================================================================ */

*:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.3);
  outline-offset: 2px;
}

/* ============================================================================
   HOVER STATES FOR TOUCH DEVICES
   ============================================================================ */

@media (hover: none) {
  .btn:hover {
    animation: none;
  }

  .project-card:hover {
    animation: none;
  }
}

/* ============================================================================
   PRINT ANIMATIONS (Disable)
   ============================================================================ */

@media print {
  * {
    animation: none !important;
    transition: none !important;
  }
}