/* ═══════════════════════════════════════════════════════════════
   IT BLOG — Animations & Micro-interactions
═══════════════════════════════════════════════════════════════ */

/* ─── Keyframes ─── */
@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(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(100px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideOutRight {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(100px); }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50%       { transform: scale(1.1); opacity: 0.8; }
}

@keyframes float {
  0%   { transform: translateY(0) rotate(0deg); opacity: 0; }
  10%  { opacity: 0.4; }
  90%  { opacity: 0.4; }
  100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

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

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

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

@keyframes bounceIn {
  0%   { transform: scale(0); opacity: 0; }
  60%  { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); }
}

@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

@keyframes progressBar {
  from { width: 0%; }
  to   { width: var(--progress); }
}

@keyframes typewriter {
  from { width: 0; }
  to   { width: 100%; }
}

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

/* ─── Utility Animation Classes ─── */
.animate-fade-in      { animation: fadeIn var(--dur-slow) var(--ease-out) both; }
.animate-fade-in-up   { animation: fadeInUp var(--dur-slow) var(--ease-out) both; }
.animate-fade-in-down { animation: fadeInDown var(--dur-slow) var(--ease-out) both; }
.animate-fade-in-left { animation: fadeInLeft var(--dur-slow) var(--ease-out) both; }
.animate-fade-in-right{ animation: fadeInRight var(--dur-slow) var(--ease-out) both; }
.animate-scale-in     { animation: scaleIn var(--dur-slow) var(--ease-spring) both; }
.animate-bounce-in    { animation: bounceIn 0.5s var(--ease-spring) both; }
.animate-spin         { animation: spin 1s linear infinite; }
.animate-pulse        { animation: pulse 2s ease-in-out infinite; }

/* Delay helpers */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }
.delay-700 { animation-delay: 0.7s; }
.delay-800 { animation-delay: 0.8s; }

/* Scroll-triggered: add via JS IntersectionObserver */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-left.revealed { opacity: 1; transform: translateX(0); }

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-right.revealed { opacity: 1; transform: translateX(0); }

/* ─── Skeleton Loading ─── */
.skeleton {
  background: linear-gradient(90deg,
    var(--bg-elevated) 25%,
    var(--bg-card-hover) 37%,
    var(--bg-elevated) 63%
  );
  background-size: 1000px 100%;
  animation: shimmer 1.5s infinite linear;
  border-radius: var(--radius-md);
}

.skeleton-text { height: 14px; margin-bottom: var(--space-2); }
.skeleton-title { height: 24px; margin-bottom: var(--space-3); }
.skeleton-thumb { aspect-ratio: 16/9; width: 100%; }
.skeleton-avatar { width: 40px; height: 40px; border-radius: 50%; }

/* ─── Progress Bar ─── */
.progress {
  width: 100%;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  transition: width 1s var(--ease-out);
}

/* Reading progress bar (top of page) */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--grad-primary);
  z-index: calc(var(--z-nav) + 1);
  transition: width 0.1s linear;
  box-shadow: var(--shadow-glow);
}

/* ─── Gradient animated text ─── */
.grad-text-animate {
  background: linear-gradient(270deg, #4F46E5, #06B6D4, #8B5CF6, #F59E0B);
  background-size: 400% 400%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 6s ease infinite;
}

/* ─── Typewriter cursor ─── */
.typewriter-cursor::after {
  content: '|';
  color: var(--primary-light);
  animation: blink 1s step-end infinite;
}

/* ─── Ripple effect on buttons ─── */
.ripple-container { position: relative; overflow: hidden; }
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

/* ─── Glowing border hover ─── */
.glow-on-hover {
  transition: box-shadow var(--dur-base) var(--ease);
}
.glow-on-hover:hover {
  box-shadow: var(--shadow-glow);
}

/* ─── Floating social icons ─── */
.float-up {
  transition: transform var(--dur-base) var(--ease-spring);
}
.float-up:hover { transform: translateY(-4px); }

/* ─── Particle canvas ─── */
#particles-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* ─── Code copy button ─── */
.code-block {
  position: relative;
}

.code-copy-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-mono);
  transition: all var(--dur-fast) var(--ease);
  opacity: 0;
}

.code-block:hover .code-copy-btn { opacity: 1; }
.code-copy-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.code-copy-btn.copied { background: var(--success); color: #fff; border-color: var(--success); }

/* ─── Back to top button ─── */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 44px;
  height: 44px;
  background: var(--grad-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-glow);
  z-index: var(--z-above);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--dur-base) var(--ease-spring);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover { transform: translateY(-2px); box-shadow: 0 0 40px rgba(79,70,229,0.5); }

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