/* --- ESTILOS BASE Y VARIABLES (MODO OSCURO POR DEFECTO) --- */
:root {
  /* Paleta */
  --rosa: #ec4899;
  --morado: #8b5cf6;
  
  /* Variables de Tema (Oscuro) */
  --fondo-gradient: linear-gradient(135deg, cyan, var(--morado), var(--rosa));
  --texto-claro: #fff;
  --cristal-bg: rgba(255, 255, 255, 0.1);
  --sombra-color: rgba(0,0,0,0.3);
  --sombra-hover: rgba(255, 255, 255, 0.2);
  --preloader-bg: #0c0a1f;
  --spinner-borde: rgba(255, 255, 255, 0.3);
  --spinner-top: var(--texto-claro);
  --btn-copy-bg: rgba(255, 255, 255, 0.2);
  --footer-span: rgba(255, 255, 255, 0.7);
}

/* --- MODO CLARO (Sobrescribe las variables) --- */
.light-mode {
  --fondo-gradient: linear-gradient(135deg, #e0f7fa, #dbeafe, #fce7f3);
  --texto-claro: #1f2937; /* Texto se vuelve oscuro */
  --cristal-bg: rgba(255, 255, 255, 0.6);
  --sombra-color: rgba(0,0,0,0.1);
  --sombra-hover: rgba(0, 0, 0, 0.15);
  --preloader-bg: #ffffff;
  --spinner-borde: rgba(0, 0, 0, 0.2);
  --spinner-top: var(--morado);
  --btn-copy-bg: rgba(0, 0, 0, 0.1);
  --footer-span: rgba(0, 0, 0, 0.6);
}

* {
  margin: 0; padding: 0; box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: var(--fondo-gradient);
  color: var(--texto-claro);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem;
  /* Transición suave entre modos */
  transition: background 0.3s ease, color 0.3s ease;
}

/* --- ENCABEZADO Y TÍTULO --- */
header {
  width: 100%;
  max-width: 1200px; /* Alineado con las tarjetas */
  text-align: center;
  margin-bottom: 2rem;
  animation: fadeSlideDown 1s ease forwards;
  
  /* Añadido para el interruptor */
  display: flex;
  justify-content: center; /* Centra el título */
  align-items: center;
  position: relative;
}

header h1 {
  font-size: 2.5rem;
  margin: 0; /* Quitamos margen para alinear */
}

#titulo-animado {
  font-weight: 900;
  letter-spacing: 2px;
}

#titulo-animado span {
  background: linear-gradient(to right, var(--rosa), var(--morado));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 10px var(--sombra-hover);
  display: inline-block;
}

@keyframes fadeSlideDown {
  0% {opacity: 0; transform: translateY(-20px);}
  100% {opacity: 1; transform: translateY(0);}
}

/* --- INTERRUPTOR MODO CLARO/OSCURO --- */
.theme-switch-wrapper {
  position: absolute; /* Lo saca del flujo */
  right: 1rem; /* Lo pega a la derecha */
  top: 50%;
  transform: translateY(-50%);
}
.theme-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}
.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--cristal-bg);
  transition: .4s;
}
.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
}
input:checked + .slider {
  background-color: var(--morado);
}
input:focus + .slider {
  box-shadow: 0 0 1px var(--morado);
}
input:checked + .slider:before {
  transform: translateX(26px);
}
.slider.round {
  border-radius: 34px;
}
.slider.round:before {
  border-radius: 50%;
  /* Íconos de sol y luna */
  content: '🌙';
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--morado);
}
input:checked + .slider.round:before {
  content: '☀️';
}

/* --- SECCIÓN HERO --- */
.hero h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  text-align: center;
  animation: fadeIn 2s ease forwards;
}

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

/* --- TARJETAS --- */
.cards-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  width: 100%;
}
@media (min-width: 768px) {
  .cards-container {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1200px;
  }
}
.card {
  background: var(--cristal-bg);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 20px var(--sombra-color);
  transform-style: preserve-3d;
  position: relative;
  overflow: hidden;
  opacity: 0;
  animation: cardAppear 0.8s ease-out forwards;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  box-shadow: 0 0 25px var(--sombra-hover);
}
.card::before {
  content: '';
  position: absolute;
  left: var(--mouse-x, 50%);
  top: var(--mouse-y, 50%);
  width: 250px;
  height: 250px;
  background: radial-gradient(circle at center, var(--sombra-hover) 0%, rgba(255, 255, 255, 0) 60%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.card:hover::before {
  opacity: 1;
}
@keyframes cardAppear {
  from { opacity: 0; transform: translateY(40px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.cards-container .card:nth-child(1) { animation-delay: 0.1s; }
.cards-container .card:nth-child(2) { animation-delay: 0.2s; }
.cards-container .card:nth-child(3) { animation-delay: 0.3s; }
.cards-container .card:nth-child(4) { animation-delay: 0.4s; }
.cards-container .card:nth-child(5) { animation-delay: 0.5s; }
.cards-container .card:nth-child(6) { animation-delay: 0.6s; }
.cards-container .card:nth-child(7) { animation-delay: 0.7s; }
.cards-container .card:nth-child(8) { animation-delay: 0.8s; }
.cards-container .card:nth-child(9) { animation-delay: 0.9s; }

/* --- CONTENIDO INTERNO TARJETAS --- */
.emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
}
.card a {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.8rem 1.5rem;
  background: var(--morado);
  color: var(--texto-claro);
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  position: relative;
  transition: background 0.3s ease, padding-right 0.4s ease;
}
.card a::after {
  content: '→';
  position: absolute;
  font-size: 1.2rem;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  transition: opacity 0.3s ease, right 0.4s ease;
}
.card a:hover {
  background: var(--rosa);
  padding-right: 3rem;
}
.card a:hover::after {
  opacity: 1;
  right: 1.2rem;
}
@media (max-width: 600px) {
  header {
    justify-content: center; /* Centra el título */
  }
  .theme-switch-wrapper {
    /* Mueve el switch debajo del título en móviles */
    position: static;
    transform: none;
    margin-top: 1rem;
  }
  .hero h2 {
    font-size: 1.5rem;
  }
}

/* --- PIE DE PÁGINA --- */
footer {
  margin-top: 2rem;
  padding: 1rem;
  text-align: center;
}
footer a {
  color: var(--texto-claro);
  font-weight: bold;
  text-decoration: none;
  transition: color 0.3s ease;
}
footer a:hover {
  color: var(--rosa);
}
footer span {
  margin: 0 0.5rem;
  color: var(--footer-span);
  transition: color 0.3s ease;
}

/* --- PRELOADER ESTÉTICO --- */
#preloader {
  background-color: var(--preloader-bg);
  background-image: var(--fondo-gradient);
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeOutPreloader 2s ease-out forwards;
  transition: background 0.3s ease;
}
.spinner {
  width: 60px;
  height: 60px;
  border: 5px solid var(--spinner-borde);
  border-top-color: var(--spinner-top);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  transition: border-color 0.3s ease;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes fadeOutPreloader {
  0% { opacity: 1; visibility: visible; }
  80% { opacity: 1; visibility: visible; }
  100% { opacity: 0; visibility: hidden; }
}

/* --- ESTILOS PÁGINAS DE CONTENIDO --- */
.content-box {
  background: var(--cristal-bg);
  border-radius: 16px;
  box-shadow: 0 4px 20px var(--sombra-color);
  padding: 2rem 2.5rem;
  width: 90%;
  max-width: 900px;
  margin: 2rem 0;
  opacity: 0;
  animation: contentFadeIn 1s ease 0.2s forwards;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
@keyframes contentFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.content-box h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--texto-claro);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--rosa);
  padding-bottom: 0.5rem;
  transition: color 0.3s ease;
}
.content-box h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--texto-claro);
  margin-top: 2rem;
  margin-bottom: 1rem;
  transition: color 0.3s ease;
}
.content-box p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}
.content-box a {
  color: var(--rosa);
  font-weight: bold;
  text-decoration: none;
}
.content-box a:hover {
  text-decoration: underline;
  color: var(--texto-claro);
}
.content-box ul, .content-box ol {
  padding-left: 2rem;
  margin-bottom: 1rem;
}

/* --- Botón CTA (PayPal) --- */
.content-box .btn-cta {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.8rem 1.5rem;
  background: var(--morado);
  color: var(--texto-claro);
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s ease, transform 0.3s ease;
  text-align: center;
  font-size: 1.1rem;
}
.content-box .btn-cta:hover {
  background: var(--rosa);
  transform: scale(1.05);
}
.text-center {
  text-align: center;
}

/* --- NUEVO: Botón Copiar al Portapapeles --- */
.btn-copy {
  background: var(--btn-copy-bg);
  border: none;
  border-radius: 5px;
  color: var(--texto-claro);
  padding: 0.2rem 0.5rem;
  margin-left: 0.5rem;
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease;
  font-size: 0.9rem;
}
.btn-copy:hover {
  background: var(--rosa);
  color: #fff; /* Asegura texto blanco en hover */
}
.btn-copy:active {
  transform: scale(0.95);
}