/* =========================
   VARIABLES Y TEMAS
========================= */
:root {
  --bg: #0f0f0f;
  --text: #f0f0f0;
  --accent: #00ffe1;
  --card: #1a1a1a;
}

body.modo-claro {
  --bg: #f9f9f9;
  --text: #111;
  --accent: #0077ff;
  --card: #ffffff;
}

/* =========================
   BASE
========================= */
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.5s ease, color 0.5s ease;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, var(--accent) 0%, transparent 70%);
  opacity: 0.05;
  z-index: -1;
}

/* =========================
   LOADER
========================= */
#loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  z-index: 9999;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loader.oculto {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* =========================
   ENCABEZADO
========================= */
.encabezado {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
}

.logo {
  font-size: 2rem;
  color: var(--accent);
}

#modoToggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--accent);
}

/* =========================
   HERO
========================= */
.hero {
  text-align: center;
  padding: 4rem 2rem;
}

.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #000;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: transform 0.3s ease;
}

.btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 10px var(--accent);
}

/* =========================
   GRID Y TARJETAS
========================= */
.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  padding: 2rem;
  max-width: 900px;
  margin: auto;
}

.card {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  text-align: left;
  box-sizing: border-box;
  word-wrap: break-word;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 15px var(--accent);
}

.card h3 {
  font-size: 1.4rem;
  margin: 0 0 0.5rem;
  line-height: 1.2;
  color: var(--accent);
}

.card p {
  font-size: 1rem;
  margin: 0;
  line-height: 1.5;
  color: var(--text);
}

/* =========================
   TIPOS DE TARJETA
========================= */

/* Parallax GSAP */
.card.parallax-gsap {
  position: relative;
  overflow: hidden;
  min-height: 250px;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
              url('fondo.jpg') center / cover no-repeat;
  transition: background 0.5s ease, color 0.5s ease;
}

body.modo-claro .card.parallax-gsap {
  background: linear-gradient(rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.7)),
              url('fondo.jpg') center / cover no-repeat;
  color: #111;
}

.contenido-parallax {
  width: 100%;
  box-sizing: border-box;
  padding-top: inherit;
}

/* Flip */
.flip-container {
  perspective: 1000px;
  min-height: 250px;
  cursor: pointer;
}

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s ease;
  transform-style: preserve-3d;
}

.flip-container.girado .flip-inner {
  transform: rotateY(180deg);
}

.flip-front,
.flip-back {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  box-sizing: border-box;
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  text-align: left;
}

.flip-back {
  transform: rotateY(180deg);
}

/* Contador */
.card.contador span {
  font-size: 2rem;
  color: var(--accent);
  font-weight: bold;
}

/* Activación */
.card.accion button,
.card.modo-control button {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  border: none;
  border-radius: 5px;
  cursor: pointer;
  color: #000;
  font-weight: bold;
  transition: transform 0.3s ease;
}

.card.accion button:hover,
.card.modo-control button:hover {
  transform: scale(1.1);
}

/* Agrupador */
.card.agrupador {
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease;
  z-index: 999 !important;
  position: relative;
  transform: none !important;
}

.card.agrupador:hover {
  transform: scale(1.05);
  border-color: var(--accent);
}

/* =========================
   ELEMENTOS EXTRA
========================= */

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
}

/* Animación base */
.animar {
  opacity: 0;
  transform: translateY(30px);
}

/* Botón flotante */
.boton-wsp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: inline-block;
  width: 40px;
  height: 40px;
  transition: transform 0.3s ease;
}

.boton-wsp img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 0 4px var(--accent));
}

.boton-wsp:hover {
  transform: scale(1.2);
}

/* =========================
   RESPONSIVE: Móviles
========================= */
@media (max-width: 480px) {
  .encabezado {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    text-align: center;
  }

  .logo {
    font-size: 1.6rem;
  }

  #modoToggle {
    font-size: 1.3rem;
  }

  .hero {
    padding: 3rem 1rem;
  }

  .hero h2 {
    font-size: 1.4rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .btn {
    font-size: 0.9rem;
    padding: 0.6rem 1rem;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .card {
    padding: 1rem;
    min-height: 200px;
  }

  .card h3 {
    font-size: 1.2rem;
  }

  .card p {
    font-size: 0.95rem;
  }

  .flip-container {
    min-height: 200px;
  }

  .card.parallax-gsap {
    min-height: 200px;
  }

  .boton-wsp {
    width: 36px;
    height: 36px;
    bottom: 16px;
    right: 16px;
  }

  footer {
    font-size: 0.8rem;
    padding: 1.5rem;
  }
}