body {
  margin: 0;
  padding: 0;
  background: #eef3f7;
}

:root {
  --celeste-principal: #4fa9d9;
  --celeste-suave: #e8f4fb;
  --gris-claro: #d4dbe2;
  --gris-medio: #667381;
  --gris-oscuro: #2f3a44;
}

#libroForm {
  display: flex;
  justify-content: center;
  width: 100%;
  padding: 24px 0 46px;
  box-sizing: border-box;
}

.formulario {
  width: 980px;
  max-width: 95vw;
  background: #f8fbfd;
  border: 1px solid var(--gris-claro);
  box-shadow: 0 10px 30px rgba(47, 58, 68, 0.12);
  padding: 34px 36px 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-sizing: border-box;
}

.title_general {
  background: linear-gradient(90deg, #3d96c7, var(--celeste-principal));
  color: #f6fbff;
  font-family: 'Merriweather', serif;
  font-size: 1.4rem;
  letter-spacing: 0.4px;
  text-align: center;
  padding: 15px;
}

.datos_empresa {
  color: var(--gris-oscuro);
  font-size: 0.95rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 2px 0 4px;
}

.direccion_empresa {
  color: var(--gris-medio);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.form_title {
  font-family: 'Merriweather', serif;
  color: var(--gris-oscuro);
  font-size: 1.05rem;
  margin-top: 6px;
}

.form_column {
  display: flex;
  flex-direction: column;
}

.form_grid_4 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form_grid_2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form_row {
  display: grid;
  grid-template-columns: 1fr 1.3fr 0.8fr;
  gap: 14px;
  align-items: start;
}

.formulario label {
  color: var(--gris-medio);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.formulario input,
.formulario select,
.formulario textarea {
  width: 100%;
  box-sizing: border-box;
  border: 1.5px solid #b8c8d6;
  background: #fff;
  color: var(--gris-oscuro);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.95rem;
  padding: 11px 12px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.formulario input:focus,
.formulario select:focus,
.formulario textarea:focus {
  border-color: var(--celeste-principal);
  box-shadow: 0 0 0 2px rgba(79, 169, 217, 0.22);
}

.formulario textarea {
  min-height: 112px;
  resize: vertical;
}

.btn_enviar {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

.btn_enviar button {
  border: 1px solid var(--gris-oscuro);
  background: transparent;
  color: var(--gris-oscuro);
  font-family: 'Montserrat', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 18px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.1s ease;
}

.btn_enviar button:hover {
  background: var(--gris-oscuro);
  color: #fff;
}

.btn_enviar button:active {
  transform: scale(0.98);
}

#mensaje-ajax .success,
#mensaje-ajax .error {
  margin: 12px 0 2px;
  padding: 10px 12px;
  font-size: 0.9rem;
}

#mensaje-ajax .success {
  background: #e9f6ef;
  color: #256243;
  border: 1px solid #b8d9c8;
}

#mensaje-ajax .error {
  background: #fff1f1;
  color: #9c3f3f;
  border: 1px solid #f0c5c5;
}

.pie_form {
  background: var(--celeste-suave);
  border: 1px solid var(--gris-claro);
  color: var(--gris-medio);
  font-size: 0.87rem;
  line-height: 1.52;
  padding: 12px;
  margin-top: 6px;
}