/* ============================================================
   ANIMATIONS.CSS — Keyframes, Hover Premium y Scroll-Reveal
   AirFryer Nutrición Premium © 2024
   ============================================================ */

/* ============================================================
   KEYFRAMES
   ============================================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  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(-28px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(28px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

@keyframes pulseGreen {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0.15);
  }
}

@keyframes pulseGold {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(245, 158, 11, 0.15);
  }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(60px) scale(0.95);
  }
}

@keyframes progressPulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.7; }
}

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

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

@keyframes borderGlow {
  0%, 100% { border-color: var(--border-accent); }
  50%       { border-color: var(--accent-green); }
}

/* ============================================================
   SCROLL-REVEAL — Sistema de aparición progresiva
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Variantes direccionales */
.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition:
    opacity 0.55s var(--ease-out),
    transform 0.55s var(--ease-spring);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Delays escalonados para grids */
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.40s; }
.reveal-delay-6 { transition-delay: 0.48s; }

/* ============================================================
   HERO — Animaciones de entrada
   ============================================================ */

.hero-animate-1 {
  animation: fadeInDown 0.7s var(--ease-out) 0.2s both;
}
.hero-animate-2 {
  animation: fadeInUp 0.7s var(--ease-out) 0.4s both;
}
.hero-animate-3 {
  animation: fadeInUp 0.7s var(--ease-out) 0.6s both;
}
.hero-animate-4 {
  animation: fadeInUp 0.7s var(--ease-out) 0.8s both;
}
.hero-animate-5 {
  animation: fadeInUp 0.7s var(--ease-out) 1.0s both;
}

/* ============================================================
   HOVER PREMIUM — Efectos de interacción
   ============================================================ */

/* Glow verde en hover */
.hover-glow-green {
  transition: box-shadow var(--t-base), transform var(--t-base);
}
.hover-glow-green:hover {
  box-shadow: 0 0 0 1px var(--accent-green), 0 8px 32px rgba(16, 185, 129, 0.25);
  transform: translateY(-3px);
}

/* Glow dorado en hover */
.hover-glow-gold {
  transition: box-shadow var(--t-base), transform var(--t-base);
}
.hover-glow-gold:hover {
  box-shadow: 0 0 0 1px var(--accent-gold), 0 8px 32px rgba(245, 158, 11, 0.25);
  transform: translateY(-3px);
}

/* Subrayado animado */
.hover-underline {
  position: relative;
  display: inline-block;
}
.hover-underline::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-gold));
  border-radius: var(--radius-full);
  transition: width var(--t-base);
}
.hover-underline:hover::after { width: 100%; }

/* Shimmer en botones de alta conversión */
.btn-shimmer {
  background-size: 200% auto;
  background-image: linear-gradient(
    90deg,
    var(--accent-green) 0%,
    var(--accent-green-light) 30%,
    var(--accent-gold-light) 50%,
    var(--accent-green-light) 70%,
    var(--accent-green) 100%
  );
  animation: shimmer 3s linear infinite;
}

/* ============================================================
   LOADING STATES
   ============================================================ */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-elevated) 25%,
    rgba(255,255,255,0.04) 50%,
    var(--bg-elevated) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.6s linear infinite;
  border-radius: var(--radius-md);
}

/* ============================================================
   PULSACIÓN EN ELEMENTOS DE CONVERSIÓN
   ============================================================ */

.pulse-green {
  animation: pulseGreen 2.5s ease-in-out infinite;
}

.pulse-gold {
  animation: pulseGold 2.5s ease-in-out infinite;
}

/* ============================================================
   NÚMERO ANIMADO AL APARECER
   ============================================================ */

.number-animate {
  animation: numberCount 0.5s var(--ease-spring) both;
}

/* ============================================================
   TARJETAS DE RECETA — Hover 3D ligero
   ============================================================ */

.recipe-card {
  transform-style: preserve-3d;
  will-change: transform;
}

.recipe-card:hover .recipe-card__image-placeholder {
  transform: scale(1.08) translateZ(10px);
}

/* ============================================================
   FAQ ACORDEÓN
   ============================================================ */

.faq-item {
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding: var(--space-5) 0;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--text-primary);
  transition: color var(--t-fast);
  user-select: none;
}

.faq-question:hover { color: var(--accent-green); }

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border: 1px solid var(--border-medium);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all var(--t-base);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: var(--accent-green-glow);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out), padding 0.3s var(--ease-out);
}

.faq-item.open .faq-answer {
  max-height: 400px;
}

.faq-answer__inner {
  padding-bottom: var(--space-5);
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   PROGRESS BAR ANIMACIÓN
   ============================================================ */

#progress-bar {
  animation: progressPulse 2s ease-in-out infinite;
  animation-play-state: paused;
}

#progress-bar.active {
  animation-play-state: running;
}

/* ============================================================
   PREFERENCIA: REDUCIR MOVIMIENTO
   ============================================================ */

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

  .reveal,
  .reveal-left,
  .reveal-right,
  .reveal-scale {
    opacity: 1;
    transform: none;
    transition: none;
  }
}