/* ==========================
  Pantalla de introducción emotiva
  - Cubre toda la ventana
  - Fondo negro con transición de opacidad
  - Tipografías y animaciones de líneas
  ========================== */
#introduccion {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

#introduccion::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  opacity: 1;
  transition: opacity 12s ease-in-out;
  z-index: -1;
}

#textoIntroduccion {
  text-align: center;
  color: white;
  font-family: "Poppins", sans-serif;
  max-width: 80%;
}

.linea-texto {
  font-size: 2.8rem;
  font-weight: 300;
  margin: 25px 0;
  opacity: 0;
  transform: translateY(50px) scale(0.9);
  transition: all 2s ease;
  line-height: 1.3;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.linea-texto.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Responsive para móviles (introducción) */
@media (max-width: 768px) {
  .linea-texto {
    font-size: 1.8rem;
  }
  
  #textoIntroduccion {
    max-width: 90%;
  }
}

/* ==========================
/* ==========================
  Navegación - Botón volver al índice principal (FIJO)
  ========================== */
.header-navigation-fixed {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999; /* Por encima de todo */
  display: none; /* Oculto inicialmente, se muestra después de la introducción */
  opacity: 0;
  transition: opacity 0.5s ease;
}

.header-navigation-fixed.visible {
  display: block;
  opacity: 1;
}

.btn-volver-indice {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  transition: all 0.3s ease;
  border: 2px solid transparent;
  backdrop-filter: blur(10px);
}

.btn-volver-indice:hover {
  background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
  color: white;
  text-decoration: none;
}

.btn-volver-indice:active {
  transform: translateY(0);
  box-shadow: 0 3px 10px rgba(102, 126, 234, 0.3);
}

/* Responsive para móviles */
@media (max-width: 768px) {
  .btn-volver-indice {
    font-size: 0.8rem;
    padding: 10px 16px;
  }
  
  .header-navigation-fixed {
    top: 15px;
    right: 15px;
  }
}

/* ==========================
  Estilos base del documento
  - Tipografía general
  - Fondo con gradiente y transición
  - Centrado del contenedor principal
  ========================== */
body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(120deg, #dfe6e9, #2589b4);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background 1s ease;
  margin: 0;
}

/* ==========================
  Pantalla de experiencia inmersiva
  - Cubre viewport
  - Transiciones de fondo
  - Oculta inicialmente
  ========================== */
#pantallaExperiencia {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  transition: background 1.2s ease, background-color 1.2s ease;
  display: none; /* estaba inline en index.html */
}

/* Overlay para transiciones de fondo (fade in/out) */
#bgOverlay {
  position: absolute;
  inset: 0;
  background: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s ease;
  z-index: 0;
}

/* Asegurar que el contenido quede sobre el overlay */
#contenedorFrases {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
  text-align: center;
  padding: 0 20px;
}

/* Frase principal de la experiencia */
#fraseAutomatica {
  font-family: "DM Serif Text", serif;
  font-size: 2.5rem; /* desde inline */
  font-weight: 300;   /* desde inline */
  color: #ffffff;     /* desde inline */
  text-shadow: 0 0 20px rgba(255,255,255,0.3); /* desde inline */
  max-width: 80%;     /* desde inline */
  line-height: 1.4;   /* desde inline */
  margin: 0;          /* desde inline */
  transition: all 1s ease; /* unifica con inline */
}

/* Estados iniciales ocultos que estaban inline */
#contenedor { display: none; }

/* Estilos trasladados desde inline */
#exitHint {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.9);
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: 12px;
  background: rgba(0,0,0,0.25);
  backdrop-filter: blur(6px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  z-index: 1000;
  display: none;
}

/* Botón de volver (esquina superior derecha) */
#btnVolver {
  position: fixed;
  top: 20px;
  right: 20px;
  background: rgba(255,255,255,0.2);
  color: white;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 25px;
  padding: 10px 18px;
  cursor: pointer;
  font-size: 0.85em;
  font-weight: 600;
  box-shadow: 0 6px 25px rgba(0,0,0,0.25);
  transition: all 0.3s ease;
  z-index: 1000;
}

#contenedor {
  background: rgba(255, 255, 255, 0.95);
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 0 25px rgba(0,0,0,0.15);
  text-align: center;
  width: 380px;
  backdrop-filter: blur(10px);
  position: relative;
}

h1 {
  color: #6c5ce7;
}

input, select {
  width: 85%;
  padding: 8px;
  margin: 5px;
  border-radius: 8px;
  border: 1px solid #ccc;
  outline: none;
}

button {
  background-color: #6c5ce7;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.3s ease;
  margin: 5px;
}

button:hover {
  background-color: #a29bfe;
  transform: scale(1.05);
}

/* Control de espaciado dinámico para el formulario */
.form-section {
  margin-bottom: 15px;
  transition: all 0.3s ease;
}

/* Estilos para el botón volver mejorado */
#btnVolver:hover {
  background: #357abd !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.6) !important;
}

#btnVolver:active {
  transform: translateY(0) !important;
  box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4) !important;
}

/* 🚪 Estilos para el botón de cerrar sesión */
.btn-cerrar-sesion {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
  display: block;
  margin: 0 auto;
  text-align: center;
  min-width: 160px;
}

.btn-cerrar-sesion:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

.btn-cerrar-sesion:active {
  transform: translateY(0);
  box-shadow: 0 3px 10px rgba(239, 68, 68, 0.3);
}

/* Ajuste del espaciado cuando hay sesión activa */
.form-section:has(.btn-cerrar-sesion) {
  margin-top: 10px;
  margin-bottom: 20px;
}