.rf-btu {
  color: #173b55;
  line-height: 1.7;
}

.rf-btu *,
.rf-btu *::before,
.rf-btu *::after {
  box-sizing: border-box;
}

.rf-btu-hero {
  padding: 95px 0;
  background: linear-gradient(125deg, #073b67, #086aa7);
  color: #fff;
  text-align: center;
}

.rf-btu-label {
  display: inline-block;
  margin-bottom: 15px;
  color: #1689be;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.rf-btu-hero .rf-btu-label {
  color: #a7e5ff;
}

.rf-btu-hero h1 {
  max-width: 800px;
  margin: 0 auto 24px;
  color: #fff;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.15;
}

.rf-btu-hero p {
  max-width: 670px;
  margin: auto;
  color: #e2f3ff;
  font-size: 18px;
}

.rf-btu-section {
  padding: 85px 0;
}

.rf-btu-heading {
  max-width: 700px;
  margin: 0 auto 42px;
  text-align: center;
}

.rf-btu h2 {
  margin: 0 0 18px;
  color: #073b67;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.25;
}

.rf-btu-heading p {
  margin: 0;
}

.rf-btu-calculator {
  max-width: 850px;
  margin: auto;
  overflow: hidden;
  border: 1px solid #dcebf5;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 12px 40px rgba(7, 59, 103, .07);
}

.rf-btu-calculator-heading {
  padding: 30px;
  background: #eef8fd;
  text-align: center;
}

.rf-btu-calculator-heading h3 {
  margin: 0 0 10px;
  color: #073b67;
  font-size: 24px;
}

.rf-btu-calculator-heading p {
  margin: 0;
}

.rf-btu-placeholder {
  padding: 45px 30px;
  text-align: center;
}

.rf-btu-placeholder > span {
  display: block;
  margin-bottom: 18px;
  color: #086aa7;
  font-size: 36px;
  font-weight: 800;
}

.rf-btu-placeholder p {
  max-width: 500px;
  margin: 0 auto 26px;
}

.rf-btu-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 12px 25px;
  border-radius: 8px;
  background: #086aa7;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.rf-btu-button:hover {
  background: #073b67;
}

.rf-btu-button:focus-visible {
  outline: 3px solid #24a9df;
  outline-offset: 4px;
}

.rf-btu-light {
  background: #eef8fd;
}

.rf-btu-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.rf-btu-card {
  padding: 30px;
  background: #fff;
  border: 1px solid #dcebf5;
  border-radius: 14px;
}

.rf-btu-card h3 {
  margin: 0 0 14px;
  color: #073b67;
  font-size: 20px;
}

.rf-btu-card p {
  margin: 0;
}

.rf-btu-notice {
  padding: 65px 0;
  background: #073b67;
  color: #fff;
}

.rf-btu-notice h2 {
  color: #fff;
}

.rf-btu-notice p {
  max-width: 850px;
  color: #d2e9f7;
}

@media (max-width: 900px) {
  .rf-btu-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .rf-btu-hero {
    padding: 65px 0;
  }

  .rf-btu-hero p {
    font-size: 16px;
  }

  .rf-btu-section {
    padding: 55px 0;
  }

  .rf-btu-grid {
    grid-template-columns: 1fr;
  }

  .rf-btu-card {
    padding: 25px;
  }

  .rf-btu-notice {
    padding: 50px 0;
  }
}



/* Formulario */

.rf-btu-form {
  padding: 35px;
}

.rf-btu-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.rf-btu-field label {
  display: block;
  margin-bottom: 8px;
  color: #073b67;
  font-size: 14px;
  font-weight: 700;
}

.rf-btu-field input,
.rf-btu-field select {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid #c9dce8;
  border-radius: 8px;
  background: #fff;
  color: #173b55;
  font: inherit;
}

.rf-btu-field input:focus,
.rf-btu-field select:focus {
  outline: 2px solid #24a9df;
  outline-offset: 1px;
}

.rf-btu-checkbox {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 28px 0 15px;
  cursor: pointer;
}

.rf-btu-checkbox input {
  width: 18px;
  height: 18px;
  accent-color: #086aa7;
}

.rf-btu-form-help {
  margin: 0 0 25px;
  color: #597587;
  font-size: 13px;
}

.rf-btu-form .rf-btu-button {
  border: 0;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.rf-btu-error {
  margin-top: 20px;
  padding: 15px;
  border-radius: 8px;
  background: #fff1f1;
  color: #a32323;
}

/* Resultados */

.rf-btu-result {
  margin-top: 32px;
  overflow: hidden;
  border: 1px solid #cce5f4;
  border-radius: 14px;
  background: #f4faff;
}

.rf-btu-result[hidden],
.rf-btu-error[hidden] {
  display: none;
}

.rf-btu-result-primary {
  padding: 30px;
  background: #073b67;
  color: #fff;
  text-align: center;
}

.rf-btu-result-primary span,
.rf-btu-result-primary small {
  display: block;
}

.rf-btu-result-primary strong {
  display: block;
  margin: 10px 0;
  color: #fff;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.2;
}

.rf-btu-result-details {
  padding: 20px 28px;
}

.rf-btu-result-details p {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  margin: 0;
  padding: 13px 0;
  border-bottom: 1px solid #dcebf5;
}

.rf-btu-result-details p:last-child {
  border: 0;
}

.rf-btu-result-details strong {
  color: #073b67;
  text-align: right;
}

.rf-btu-result-note {
  margin: 0;
  padding: 15px 28px 25px;
  color: #597587;
  font-size: 13px;
}

@media (max-width: 640px) {
  .rf-btu-form {
    padding: 22px;
  }

  .rf-btu-fields {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .rf-btu-result-details p {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .rf-btu-result-details strong {
    text-align: left;
  }
}