#certificado {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: transparent;
  padding: 4rem 2rem;
  box-sizing: border-box;
  width: 100%;
  overflow: visible;
}

#titulo-pdf {
  font-size: 3rem;
  font-weight: bold;
  color: var(--blanco);
  margin-bottom: 1.6rem;
  letter-spacing: 1px;
  text-align: center;
  width: min(100%, 1200px);
}

#pdf-render {
  border: none;
  width: 100%;
  max-width: 920px;
  height: auto;
  position: relative;
  z-index: var(--z-alto); /* Variable (10) */
  background: #fff;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.16);
  margin-bottom: 0;
  border-radius: 24px;
}

.navigation {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
  gap: 1rem;
  width: min(100%, 1200px);
  padding: 1.8rem;
  border: 0.2rem solid var(--accent-gold);
  border-radius: 50px;
  background: var(--surface-card);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
}

.navigation button {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: 0.2rem solid var(--button-border);
  font-size: 1.5rem;
  padding: 10px 20px;
  border-radius: 50px;
  cursor: pointer;
  transition:
    background-color 0.3s,
    color 0.3s,
    transform 0.25s ease;
  z-index: var(--z-alto); /* Variable (10) */
}

.navigation button:hover {
  background-color: var(--button-hover-fill);
  color: var(--button-hover-text);
  border: 1px solid var(--button-hover-fill);
  transform: translateY(-2px);
}

.botones {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 0;
  width: 100%;
}

@media (max-width: 780px) {
  .navigation {
    padding: 1.2rem;
  }

  .navigation button {
    padding: 0.9rem 1.4rem;
  }
}

.botones .btn {
  position: relative;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 600px;
  padding: 25px 40px;
  background-color: var(--button-bg);
  border: 0.2rem solid var(--button-border);
  border-radius: 50px;
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--button-text);
  z-index: var(--z-normal);
  overflow: hidden;
  transition: 0.5s;
  text-align: center;
  text-decoration: none;
}

.botones .btn:hover {
  color: var(--button-hover-text);
}

.botones .btn:nth-child(2) {
  background: transparent;
  color: var(--button-hover-text);
}

.botones .btn:nth-child(2):hover {
  color: var(--fondo-oscuro);
}

.botones .btn:nth-child(2)::before {
  background: var(--button-bg);
}

.botones .btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background: var(--button-hover-fill);
  z-index: var(--z-fondo);
  transition: 0.5s;
}

.botones .btn:hover::before {
  width: 100%;
}