/* ============================================================
   ANIMATIONS — suryachowdary.in
   Cinematic keyframes & scroll-reveal system
   ============================================================ */

/* ── Keyframes ── */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  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(-32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* Character reveal — used by Hero name stagger */
@keyframes charReveal {
  from {
    opacity: 0;
    transform: translateY(60%) rotateX(-20deg);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotateX(0deg);
    filter: blur(0);
  }
}

/* Gold shimmer for accent elements */
@keyframes goldShimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}

/* Subtle float for decorative elements */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-8px); }
}

/* Pulse glow for CTA and accents */
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 12px rgba(201, 169, 110, 0.20); }
  50%       { box-shadow: 0 0 32px rgba(201, 169, 110, 0.45); }
}

/* Scroll progress bar fill */
@keyframes progressFill {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* Draw line — timeline connector */
@keyframes drawLine {
  from { transform: scaleY(0); }
  to   { transform: scaleY(1); }
}

/* Spin — for loading or decorative rings */
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Blink cursor */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ── Scroll-Reveal System ── */

/* Initial hidden state — applied via JS/IntersectionObserver */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.75s var(--ease-cinematic),
    transform 0.75s var(--ease-cinematic);
}

.reveal.reveal-left {
  transform: translateX(-28px);
}

.reveal.reveal-right {
  transform: translateX(28px);
}

.reveal.reveal-scale {
  transform: scale(0.94);
}

/* Visible state — added by IntersectionObserver */
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

/* Stagger delays for child elements */
.reveal-stagger > *:nth-child(1)  { transition-delay: 0ms; }
.reveal-stagger > *:nth-child(2)  { transition-delay: 80ms; }
.reveal-stagger > *:nth-child(3)  { transition-delay: 160ms; }
.reveal-stagger > *:nth-child(4)  { transition-delay: 240ms; }
.reveal-stagger > *:nth-child(5)  { transition-delay: 320ms; }
.reveal-stagger > *:nth-child(6)  { transition-delay: 400ms; }
.reveal-stagger > *:nth-child(7)  { transition-delay: 480ms; }
.reveal-stagger > *:nth-child(8)  { transition-delay: 560ms; }

/* ── Named Animation Classes ── */

.animate-fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-smooth) both;
}

.animate-fade-in-up {
  animation: fadeInUp var(--duration-slow) var(--ease-cinematic) both;
}

.animate-fade-in-down {
  animation: fadeInDown var(--duration-slow) var(--ease-cinematic) both;
}

.animate-scale-in {
  animation: scaleIn var(--duration-slow) var(--ease-cinematic) both;
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

.animate-pulse-glow {
  animation: pulseGlow 2.5s ease-in-out infinite;
}

.animate-spin-slow {
  animation: spin 12s linear infinite;
}

.animate-blink {
  animation: blink 1s step-end infinite;
}

/* ── Reduced Motion Overrides ── */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.reveal-left,
  .reveal.reveal-right,
  .reveal.reveal-scale {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .animate-fade-in,
  .animate-fade-in-up,
  .animate-fade-in-down,
  .animate-scale-in,
  .animate-float,
  .animate-pulse-glow,
  .animate-spin-slow,
  .animate-blink {
    animation: none;
  }
}