/* ═══════════════════════════════════════════════════════════
   CODEVANTUM — PREMIUM ANIMATIONS SYSTEM
   All animations are GPU-accelerated, respects prefers-reduced-motion
═══════════════════════════════════════════════════════════ */

/* ── 1. Keyframes ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

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

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

@keyframes scaleUp {
  from { opacity: 0; transform: scale(0.88); }
  to   { opacity: 1; transform: scale(1); }
}

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

@keyframes floatSlow {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50%       { transform: translateY(-16px) rotate(2deg); }
}

@keyframes pulseShadow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.18); }
  50%       { box-shadow: 0 0 0 14px rgba(124, 58, 237, 0); }
}

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

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bounceIn {
  0%   { opacity: 0; transform: scale(0.6); }
  60%  { opacity: 1; transform: scale(1.05); }
  80%  { transform: scale(0.97); }
  100% { transform: scale(1); }
}

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

@keyframes underlineGrow {
  from { transform: scaleX(0); transform-origin: left; }
  to   { transform: scaleX(1); transform-origin: left; }
}

@keyframes counterUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 2. Scroll-Reveal Base (hidden state) ── */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s cubic-bezier(.22,.68,0,1.1),
              transform 0.7s cubic-bezier(.22,.68,0,1.1);
}

.reveal.reveal-left {
  transform: translateX(-36px);
}
.reveal.reveal-right {
  transform: translateX(36px);
}
.reveal.reveal-scale {
  transform: scale(0.9);
}

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

/* Stagger delays for children */
.stagger-children > *:nth-child(1)  { transition-delay: 0.05s; }
.stagger-children > *:nth-child(2)  { transition-delay: 0.15s; }
.stagger-children > *:nth-child(3)  { transition-delay: 0.25s; }
.stagger-children > *:nth-child(4)  { transition-delay: 0.35s; }
.stagger-children > *:nth-child(5)  { transition-delay: 0.45s; }
.stagger-children > *:nth-child(6)  { transition-delay: 0.55s; }

/* ── 3. Nav — slide-down on load ── */
nav {
  animation: navDrop 0.55s cubic-bezier(.22,.68,0,1.1) both;
}

.logo {
  transition: transform 0.3s ease, color 0.2s;
}
.logo:hover {
  transform: scale(1.05);
}

.nav-link {
  position: relative;
  transition: color 0.22s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--purple);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s cubic-bezier(.22,.68,0,1.1);
  border-radius: 2px;
}
.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* ── 4. Hero ── */
.hero h1 {
  animation: fadeUp 0.7s 0.1s cubic-bezier(.22,.68,0,1.1) both;
}
.hero .subtitle {
  animation: fadeUp 0.7s 0.25s cubic-bezier(.22,.68,0,1.1) both;
}
.hero .image-loader {
  animation: scaleUp 0.8s 0.35s cubic-bezier(.22,.68,0,1.1) both;
}
.hero .btn {
  animation: fadeUp 0.7s 0.5s cubic-bezier(.22,.68,0,1.1) both;
}

/* Float the hero image */
.hero .image-loader img {
  animation: floatSlow 6s ease-in-out infinite;
}

/* ── 5. CTA Button Micro-interactions ── */
.btn {
  transition: transform 0.18s cubic-bezier(.22,.68,0,1.3),
              box-shadow 0.18s ease,
              background 0.3s ease;
  will-change: transform;
}
.btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 32px rgba(124, 58, 237, 0.35);
}
.btn:active {
  transform: translateY(0px) scale(0.98);
  box-shadow: var(--btn-shadow-active);
}

/* Gradient text pulse on accent spans */
.accent {
  background: linear-gradient(270deg, var(--purple), var(--lavender), #c4b5fd, var(--purple));
  background-size: 400% 400%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 5s ease infinite;
}

/* ── 6. Features Cards ── */
.feat {
  transition: transform 0.32s cubic-bezier(.22,.68,0,1.2),
              box-shadow 0.32s ease,
              border-color 0.32s ease;
  will-change: transform;
}
.feat:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 24px 48px rgba(124, 58, 237, 0.1);
  border-color: rgba(124, 58, 237, 0.35);
}

.feat .icon {
  transition: transform 0.35s cubic-bezier(.22,.68,0,1.3);
}
.feat:hover .icon {
  transform: scale(1.18) rotate(-5deg);
}

/* ── 7. Path Cards (Curriculum) ── */
.path-card {
  transition: transform 0.32s cubic-bezier(.22,.68,0,1.2),
              box-shadow 0.32s ease,
              border-color 0.3s ease;
  will-change: transform;
}
.path-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 28px 56px rgba(124, 58, 237, 0.13);
  border-color: rgba(124, 58, 237, 0.3);
}

.path-icon {
  transition: transform 0.4s cubic-bezier(.22,.68,0,1.3);
}
.path-card:hover .path-icon {
  transform: scale(1.12) translateY(-4px);
}

/* ── 8. FAQ Items ── */
.faq-item {
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: default;
}
.faq-item:hover {
  transform: translateX(6px);
  box-shadow: -4px 0 0 var(--purple), 0 8px 24px rgba(124, 58, 237, 0.07);
  border-color: rgba(124, 58, 237, 0.25);
}

/* ── 9. Concept Cards (Knowledge Hub) ── */
.concept-card {
  transition: transform 0.3s cubic-bezier(.22,.68,0,1.2),
              box-shadow 0.3s ease,
              background 0.3s ease;
  will-change: transform;
}
.concept-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 40px rgba(124, 58, 237, 0.1);
  background: linear-gradient(135deg, rgba(124,58,237,0.06), rgba(139,92,246,0.04));
}

/* ── 10. Challenge Card floating ── */
.challenge-card {
  transition: box-shadow 0.3s ease;
  animation: floatY 7s ease-in-out infinite;
}
.challenge-card:hover {
  box-shadow: 0 32px 64px rgba(124, 58, 237, 0.15);
}

/* ── 11. Stat Items ── */
.stat-item strong {
  display: inline-block;
  transition: transform 0.2s ease, color 0.2s ease;
}
.stat-item:hover strong {
  transform: scale(1.1);
  color: var(--purple);
}

/* ── 12. Device Frame float ── */
.app-preview-outer .device-frame {
  animation: floatY 5s ease-in-out infinite;
  transition: transform 0.3s ease;
}
.app-preview-outer:hover .device-frame {
  animation-play-state: paused;
  transform: scale(1.02);
}

/* ── 13. Reviews marquee section header ── */
.reviews-section .section-header {
  animation: fadeUp 0.6s 0.1s both;
}

/* ── 14. Section headers (global) ── */
.section-header .tag {
  transition: transform 0.25s ease, background 0.25s ease;
}
.section-header .tag:hover {
  transform: scale(1.05);
  background: rgba(124,58,237,0.22);
}

/* ── 15. Footer columns link animations ── */
.footer-col a {
  transition: color 0.2s, transform 0.2s;
  display: inline-block;
}
.footer-col a:hover {
  transform: translateX(5px);
  color: var(--purple);
}

/* ── 16. Nav icon hover ── */
.nav-icon {
  transition: transform 0.22s cubic-bezier(.22,.68,0,1.4), color 0.2s;
}
.nav-icon:hover {
  transform: scale(1.22) rotate(-8deg);
  color: var(--purple);
}

/* ── 17. Image loader reveal animation ── */
.image-loader.loaded img {
  animation: scaleUp 0.55s cubic-bezier(.22,.68,0,1.1) both;
}

/* ── 18. Pulse on badges ── */
.badge, .hero-tag {
  animation: pulseShadow 3s ease-in-out infinite;
}

/* ── 19. Rewards section image ── */
.rewards-section-new .image-loader img {
  animation: floatY 6s ease-in-out infinite;
}

/* ── 20. Course CTA links ── */
a[href="/courses"][style*="display:inline-block"] {
  transition: transform 0.2s ease, color 0.2s;
  display: inline-flex !important;
  align-items: center;
  gap: 4px;
}
a[href="/courses"][style*="display:inline-block"]:hover {
  transform: translateX(5px);
}

/* ── Prefers Reduced Motion — Kill all ── */
@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; }
}