/* ===================================================
   ANIMATIONS.CSS — MICRO-INTERACTIONS & MOTION
   MD Saib Hossain Portfolio
   =================================================== */

/* ===== FADE ENTRANCES ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  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(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Utility Animation Classes */
.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.fade-in-up {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.fade-in-slow {
  animation: fadeIn 1.2s ease forwards;
}

.scale-in {
  animation: scaleIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ===== HERO NAME LETTER ENTRANCE ===== */
@keyframes letterEntrance {
  0% {
    opacity: 0;
    transform: translateY(25px) scale(0.85);
  }
  60% {
    opacity: 0.8;
    transform: translateY(-4px) scale(1.03);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.letter {
  display: inline-block;
  opacity: 0;
  animation: letterEntrance 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ===== GLOWS & PULSES ===== */
@keyframes glowPulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 0.95;
    transform: scale(1.03);
  }
}

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

.float-slow {
  animation: floatSlow 5s ease-in-out infinite;
}

/* ===== SHIMMER EFFECT ===== */
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ===== SCROLL REVEAL UTILITIES ===== */
.scroll-reveal-up,
.scroll-reveal-left,
.scroll-reveal-right,
.scroll-reveal-center,
.scroll-fade-target {
  opacity: 0;
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal-up { transform: translateY(30px); }
.scroll-reveal-left { transform: translateX(-30px); }
.scroll-reveal-right { transform: translateX(30px); }
.scroll-reveal-center { transform: scale(0.96); }

.scroll-reveal-up.is-visible,
.scroll-reveal-left.is-visible,
.scroll-reveal-right.is-visible,
.scroll-reveal-center.is-visible,
.scroll-fade-target.is-visible {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* 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; }

/* Motion Reduction */
@media (prefers-reduced-motion: reduce) {
  .fade-in, .fade-in-up, .fade-in-slow, .scale-in, .letter, .float-slow {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .scroll-reveal-up, .scroll-reveal-left, .scroll-reveal-right, .scroll-reveal-center, .scroll-fade-target {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}