/**
 * animations.css — Animaciones y transiciones globales
 *
 * Incluye la intro animada de bienvenida.
 * Respeta prefers-reduced-motion.
 */

/* ─── Intro de bienvenida (Splash Screen) ───────────────────────────────── */

#intro-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-dark);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#intro-screen.intro--hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro__logo {
  width: 120px;
  height: auto;
  animation: introLogo 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  opacity: 0;
}

.intro__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  color: var(--color-text-inverse);
  margin-top: var(--space-6);
  letter-spacing: 0.08em;
  animation: introText 0.6s ease 0.5s forwards;
  opacity: 0;
}

.intro__bar {
  display: flex;
  width: 60px;
  height: 3px;
  margin-top: var(--space-4);
  border-radius: var(--radius-pill);
  overflow: hidden;
  animation: introBar 0.4s ease 0.9s forwards;
  opacity: 0;
}

.intro__bar::before {
  content: '';
  flex: 1;
  background: var(--color-grana);
}

.intro__bar::after {
  content: '';
  flex: 1;
  background: var(--color-blue);
}

@keyframes introLogo {
  from { opacity: 0; transform: scale(0.7) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

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

@keyframes introBar {
  from { opacity: 0; transform: scaleX(0); }
  to   { opacity: 1; transform: scaleX(1); }
}


/* ─── Animaciones de entrada genéricas ──────────────────────────────────── */

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

.animate-slide-up {
  animation: slideUp 0.5s ease forwards;
}

.animate-slide-down {
  animation: slideDown 0.3s ease forwards;
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}


/* ─── Scroll reveal (activado via JS con IntersectionObserver) ──────────── */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }


/* ─── Skeleton loading (placeholders de carga) ──────────────────────────── */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-section) 25%,
    var(--color-border) 50%,
    var(--color-bg-section) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}


/* ─── Accesibilidad — Sin animaciones ───────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  #intro-screen {
    transition: none;
  }

  .intro__logo,
  .intro__title,
  .intro__bar {
    animation: none;
    opacity: 1;
  }

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

  .skeleton {
    animation: none;
  }
}