html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: "Poppins", sans-serif;
  color: white;
}

/* --- Fondo animado --- */
video.bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: -1;
}

/* --- Texto principal --- */
.letra {
  position: absolute;
  top: 50%;             /* centra mejor verticalmente */
  left: 70%;            /* centra horizontalmente */
  transform: translate(-50%, -50%);
  width: 145%;           /* evita que se salga del marco */
  text-align: center;
  font-size: 1.8em;
  letter-spacing: 1px;
  animation: aparecer 3s ease-in-out;
  text-shadow: 0 0 10px rgba(255,255,255,0.8);
  font-family: 'Times New Roman', Times, serif;
  opacity: 1;
  transition: opacity 1s ease-in-out;
  z-index: 10;
}

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

/* --- Botón --- */
.boton {
  position: absolute;
  bottom: 10%;
  left: 20%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  padding: 15px 30px;
  border-radius: 25px;
  color: white;
  font-size: 1.1em;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
  font-family: 'Times New Roman', Times, serif;
}

.boton:hover {
  background: rgba(255,255,255,0.4);
  transform: translateX(-50%) scale(1.05);
}

/* --- Carta --- */
.carta {
  display: none;
  position: fixed;
  top: 50%; left: 20%;
  transform: translate(-50%, -50%) scale(0.8);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  padding: 30px;
  max-width: 600px;
  max-height: 800px;
  text-align: center;
  backdrop-filter: blur(10px);
  box-shadow: 0 0 20px rgba(255,255,255,0.3);
  animation: abrir 0.6s ease forwards;
  font-family: 'Times New Roman', Times, serif;
}

@keyframes abrir {
  to { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.cerrar {
  margin-top: 15px;
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  padding: 8px 16px;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
  font-family: 'Times New Roman', Times, serif;
}

.cerrar:hover {
  background: rgba(255,255,255,0.4);
}

.encabezado {
  position: absolute;
  top: 10%;
  width: 100%;
  text-align: center;
  color: white;
  text-shadow: 0 0 10px rgba(0,0,0,0.5);
  animation: fadeIn 3s ease-in-out;
}

.titulo {
  font-size: 3em;
  margin: 0;
  font-weight: 700;
  font-family: 'Times New Roman', Times, serif;
}

.subtitulo {
  font-size: 1.5em;
  margin-top: 0.3em;
  font-weight: 400;
  font-family: 'Times New Roman', Times, serif;
}

.fecha {
  font-size: 1em;
  margin-top: 0.5em;
  opacity: 0.8;
  font-family: 'Times New Roman', Times, serif;
}

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