body {
  background: radial-gradient(circle at top, #041526, #010b15);
  color: #eaf2fa;
  font-family: "Poppins", sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

/* === Contenedor principal === */
.contenedor {
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  padding: 3rem 3.5rem;
  border-radius: 25px;
  box-shadow: 0 0 35px rgba(0, 200, 255, 0.25);
  width: 520px;
  max-width: 90%;
  text-align: center;
  transition: all 0.3s ease;
}

.contenedor:hover {
  box-shadow: 0 0 50px rgba(212, 0, 255, 0.432);
}

/* === Firma superior === */
.firma {
  text-align: right;
  font-size: 0.9rem;
  color: #7700ff;
  font-weight: 500;
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

/* === Título y descripción === */
.titulo {
  color: #ff0000;
  font-weight: 600;
  font-size: 1.6rem;
  margin-bottom: 0.8rem;
}

.descripcion {
  color: #a5b5c3;
  font-size: 1rem;
  margin-bottom: 2rem;
}

/* === Etiquetas y campos === */
label {
  display: block;
  text-align: left;
  color: #d5e2ed;
  font-weight: 500;
  margin-top: 1rem;
}

input.form-control,
select.form-select {
  background-color: #0b2037;
  border: 1px solid #1c3853;
  color: #eaf2fa;
  border-radius: 10px;
  font-size: 1rem;
  height: 45px;
  transition: border 0.3s ease, background 0.3s ease;
}

input.form-control::placeholder {
  color: #7f95aa;
}

input.form-control:focus,
select.form-select:focus {
  border-color: #4fd1c5;
  box-shadow: 0 0 6px #4fd1c5;
  background-color: #0f2d4b;
}

/* === Botón principal === */
.btn-calcular {
  background: linear-gradient(90deg, #db3f3f, #8027c9);
  border: none;
  color: #fff;
  font-weight: 600;
  width: 100%;
  margin-top: 2rem;
  padding: 0.9rem;
  font-size: 1.1rem;
  border-radius: 12px;
  transition: transform 0.2s ease, background 0.3s ease;
}

.btn-calcular:hover {
  background: linear-gradient(90deg, #38b2ac, #2b6cb0);
  transform: translateY(-2px);
}

/* === Resultados === */
.resultados {
  margin-top: 2.2rem;
  text-align: left;
}

.resultados h5 {
  color: #d63030;
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
}

.resultados ul {
  background: rgba(8, 26, 46, 0.9);
  border-radius: 12px;
  padding: 15px 18px;
  list-style: none;
  border: 1px solid #1e3a4f;
  font-size: 1rem;
}

.resultados li {
  padding: 7px 0;
  border-bottom: 1px solid rgba(79, 209, 197, 0.2);
}

.resultados li:last-child {
  border-bottom: none;
}