/* ============================================
   Animations & Transitions
   120fps GPU-Composited Pipeline
   ============================================ */

/* --- Reveal on Scroll --- */
.reveal {
  opacity: 0;
  transform: translate3d(0, 30px, 0);
  will-change: transform, opacity;
  backface-visibility: hidden;
  transition:
    opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  will-change: auto;
}

.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }

/* --- Typing Cursor Blink --- */
@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero__cursor {
  animation: blink 0.8s steps(1) infinite;
  color: var(--color-primary);
  font-weight: var(--fw-bold);
  will-change: opacity;
}

/* --- Hero Scroll Indicator Bounce --- */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translate3d(-50%, 0, 0); }
  40% { transform: translate3d(-50%, -8px, 0); }
  60% { transform: translate3d(-50%, -4px, 0); }
}

.hero__scroll-indicator {
  animation: bounce 2.5s infinite;
  will-change: transform;
  backface-visibility: hidden;
}

/* --- Floating Animation for Hero Visual --- */
@keyframes float {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -12px, 0); }
}

.hero__visual {
  animation: float 6s ease-in-out infinite;
  will-change: transform;
  backface-visibility: hidden;
}

/* --- Skill Bar Fill (GPU: scaleX instead of width) --- */
.skill-item__fill {
  transform: scaleX(0);
  transform-origin: left;
  will-change: transform;
  backface-visibility: hidden;
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[dir="rtl"] .skill-item__fill {
  transform-origin: right;
}

.skill-item.revealed .skill-item__fill {
  transform: scaleX(var(--fill-fraction, 1));
}

/* --- Service Card Hover Glow --- */
.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary-glow), transparent);
  opacity: 0;
  will-change: opacity;
  backface-visibility: hidden;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.service-card:hover::before {
  opacity: 1;
}

/* --- Project Card Overlay --- */
.project-card__overlay {
  opacity: 0;
  will-change: opacity;
  backface-visibility: hidden;
  transition: opacity var(--transition-base);
}

.project-card:hover .project-card__overlay {
  opacity: 1;
}

.project-card__placeholder {
  will-change: transform;
  backface-visibility: hidden;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__placeholder {
  transform: scale3d(1.05, 1.05, 1);
}

/* --- Nav Link Underline --- */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  will-change: transform;
  backface-visibility: hidden;
  transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* --- Button Hover Lift --- */
.btn {
  will-change: transform;
  backface-visibility: hidden;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.btn:hover {
  transform: translate3d(0, -2px, 0);
}

.btn:active {
  transform: translate3d(0, 0, 0);
}

/* --- Social Link Hover --- */
.social-link {
  will-change: transform;
  backface-visibility: hidden;
  transition:
    color var(--transition-fast),
    transform var(--transition-fast),
    background var(--transition-fast);
}

.social-link:hover {
  transform: translate3d(0, -3px, 0);
  color: var(--color-primary);
  background: var(--color-primary-glow);
}

/* --- Theme Toggle Rotate --- */
.btn-icon svg {
  will-change: transform;
  backface-visibility: hidden;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

#themeToggle:hover svg {
  transform: rotate(30deg);
}

/* --- Background Grid Animation --- */
@keyframes gridMove {
  0% { transform: translate3d(0, 0, 0); }
  100% { transform: translate3d(40px, 40px, 0); }
}

.hero__bg-grid {
  animation: gridMove 20s linear infinite;
  will-change: transform;
  backface-visibility: hidden;
}

/* --- Navbar Slide Down --- */
@keyframes slideDown {
  from {
    transform: translate3d(0, -100%, 0);
    opacity: 0;
  }
  to {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

.navbar {
  animation: slideDown 0.6s ease forwards;
  will-change: transform, opacity;
  backface-visibility: hidden;
}

/* --- Form Focus Ring --- */
.form-group input:focus,
.form-group textarea:focus {
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

/* --- Heart beat in footer --- */
@keyframes heartbeat {
  0%, 100% { transform: scale3d(1, 1, 1); }
  15% { transform: scale3d(1.25, 1.25, 1); }
  30% { transform: scale3d(1, 1, 1); }
  45% { transform: scale3d(1.15, 1.15, 1); }
}

.footer__heart {
  display: inline-block;
  animation: heartbeat 1.5s ease-in-out infinite;
  color: #e74c3c;
  will-change: transform;
  backface-visibility: hidden;
}

/* --- Mobile Nav Slide --- */
@keyframes navSlideIn {
  from {
    opacity: 0;
    transform: translate3d(0, -20px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }

  .hero__visual {
    animation: none;
  }

  .hero__scroll-indicator {
    animation: none;
  }

  .hero__bg-grid {
    animation: none;
  }
}