/* Reset y configuración base para la experiencia 3D */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  width: 100vw;
  height: 100vh;
  overflow: hidden; /* Cero scroll en la ventana principal, el 3D domina */
  background-color: #0f172a; /* Slate 900 como base oscura */
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  color: #f8fafc;
}

/* El contenedor del canvas debe tomar todo el espacio y estar al fondo */
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1; /* Nivel base */
}

/* Estilos de la capa Fallback si WebGL falla o carga inicial */
#fallback {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #0f172a;
  z-index: 100; /* Siempre arriba del canvas si está visible */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: opacity 0.5s ease;
}

#fallback.hidden {
  opacity: 0;
  pointer-events: none;
}

.fallback-content {
  max-width: 600px;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.fallback-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: #60a5fa;
}

.fallback-content p {
  margin-bottom: 1.5rem;
  color: #cbd5e1;
  line-height: 1.6;
}

.visible {
  display: flex !important;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: #3b82f6;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s;
}

.btn:hover {
  background: #2563eb;
}

noscript .btn {
  margin-top: 1rem;
}