.body-fat-page {
  padding: 152px 0 88px;
  color: var(--body);
}

.bf-intro {
  max-width: 760px;
  margin: 0 auto 38px;
  text-align: center;
}

.bf-intro .eyebrow,
.bf-content-section > .eyebrow,
.bf-related .eyebrow {
  margin-bottom: 10px;
}

.bf-intro h1 {
  margin-bottom: 14px;
  font-size: clamp(36px, 5vw, 54px);
  letter-spacing: -0.035em;
}

.bf-lede {
  max-width: 690px;
  margin: 0 auto 20px;
  font-size: 18px;
  line-height: 1.65;
}

.bf-disclaimer {
  display: inline-block;
  padding: 9px 15px;
  border: 1px solid #f4d8d2;
  border-radius: var(--radius-pill);
  background: #fff8f6;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.bf-calculator {
  max-width: 940px;
  margin: 0 auto;
}

.bf-form-card {
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--bg);
  box-shadow: var(--shadow);
}

.bf-section-heading,
.bf-results-heading {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.bf-step {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border-radius: 14px;
  background: #fff0ed;
  color: var(--primary-hover);
  font-size: 13px;
  font-weight: 700;
}

.bf-section-heading h2,
.bf-results-heading h2 {
  margin: 0 0 5px;
  font-size: 23px;
  letter-spacing: -0.02em;
}

.bf-section-heading p,
.bf-results-heading p {
  font-size: 14px;
}

#body-fat-form {
  margin-top: 30px;
}

.bf-sex-fieldset {
  min-width: 0;
  margin-bottom: 23px;
  border: 0;
}

.bf-sex-fieldset legend,
.bf-field label {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.bf-sex-options {
  display: flex;
  width: fit-content;
  gap: 6px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--bg-soft);
}

.bf-sex-option {
  position: relative;
  cursor: pointer;
}

.bf-sex-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.bf-sex-option span {
  display: block;
  min-width: 94px;
  padding: 8px 14px;
  border-radius: 9px;
  color: var(--body);
  text-align: center;
  font-size: 14px;
  font-weight: 600;
}

.bf-sex-option input:checked + span {
  background: var(--bg);
  color: var(--ink);
  box-shadow: 0 2px 8px rgba(20, 19, 59, .1);
}

.bf-sex-option input:focus-visible + span {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.bf-field-hint,
.bf-field small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.bf-fields-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
}

.bf-field {
  min-width: 0;
}

.bf-field label {
  display: block;
}

.bf-field label span {
  color: var(--muted);
  font-weight: 400;
}

.bf-field input {
  width: 100%;
  min-height: 50px;
  padding: 11px 14px;
  border: 1px solid #dcdce8;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
}

.bf-field input::placeholder {
  color: #a4a4b7;
}

.bf-field input[aria-invalid="true"] {
  border-color: #c62828;
}

.bf-field input:disabled {
  background: var(--bg-soft);
}

.bf-error {
  margin-top: 20px;
  padding: 12px 14px;
  border: 1px solid #f1c5c5;
  border-radius: 10px;
  background: #fff6f6;
  color: #9c2020;
  font-size: 14px;
}

.bf-error[hidden],
.bf-hip-field[hidden],
.bf-results[hidden] {
  display: none;
}

.bf-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 27px;
}

.bf-calculate,
.bf-reset {
  min-height: 48px;
  padding: 11px 20px;
  border-radius: 10px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.bf-calculate {
  background: var(--primary);
  color: #fff;
}

.bf-calculate:hover {
  background: var(--primary-hover);
}

.bf-calculate span {
  margin-left: 9px;
  font-size: 18px;
}

.bf-reset {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
}

.bf-reset:hover {
  background: var(--bg-soft);
}

.bf-small-print {
  margin-top: 13px;
  color: var(--muted);
  font-size: 12px;
}

.bf-results {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.bf-results-heading {
  margin-bottom: 20px;
}

.bf-primary-result {
  display: grid;
  justify-items: center;
  gap: 3px;
  padding: 25px 20px;
  border-radius: 15px;
  background: var(--hero-gradient);
  color: rgba(255, 255, 255, .86);
  text-align: center;
  font-size: 13px;
}

.bf-primary-result strong {
  color: #fff;
  font-size: clamp(42px, 8vw, 56px);
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.bf-category {
  display: inline-block;
  margin-top: 7px;
  padding: 5px 11px;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: var(--radius-pill);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
}

.bf-mass-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.bf-mass-results > div {
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-soft);
}

.bf-mass-results dt {
  color: var(--body);
  font-size: 13px;
}

.bf-mass-results dd {
  margin-top: 5px;
  color: var(--ink);
  font-size: 21px;
  font-weight: 700;
}

.bf-result-note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

.bf-measurement-note {
  display: flex;
  gap: 14px;
  margin-top: 18px;
  padding: 20px 22px;
  border: 1px solid #e6e5f1;
  border-radius: 14px;
  background: var(--bg-soft);
}

.bf-note-icon {
  display: grid;
  width: 25px;
  height: 25px;
  flex: 0 0 25px;
  place-items: center;
  border-radius: 50%;
  background: #e8e7f6;
  color: var(--ink);
  font-family: Georgia, serif;
  font-weight: 700;
}

.bf-measurement-note h2 {
  margin-bottom: 4px;
  font-size: 15px;
}

.bf-measurement-note p {
  font-size: 13px;
  line-height: 1.65;
}

.bf-content {
  max-width: 820px;
  margin: 76px auto 0;
}

.bf-content-section {
  margin-bottom: 55px;
}

.bf-content-section h2,
.bf-related h2 {
  margin-bottom: 15px;
  font-size: clamp(25px, 4vw, 32px);
  letter-spacing: -0.025em;
}

.bf-content-section > p:not(.eyebrow) {
  margin-bottom: 14px;
  line-height: 1.8;
}

.bf-steps-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  counter-reset: bf-step;
}

.bf-steps-list li {
  position: relative;
  padding: 15px 18px 15px 52px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-soft);
  counter-increment: bf-step;
}

.bf-steps-list li::before {
  position: absolute;
  top: 15px;
  left: 17px;
  color: var(--primary-hover);
  content: counter(bf-step, decimal-leading-zero);
  font-size: 13px;
  font-weight: 700;
}

.bf-steps-list strong {
  color: var(--ink);
}

.bf-formula {
  margin: 16px 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--bg-soft);
}

.bf-formula h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.bf-formula p {
  overflow-wrap: anywhere;
}

.bf-formula code {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 14px;
  line-height: 1.7;
}

.bf-faq-list {
  border-top: 1px solid var(--border);
}

.bf-faq {
  border-bottom: 1px solid var(--border);
}

.bf-faq summary {
  position: relative;
  padding: 18px 36px 18px 2px;
  color: var(--ink);
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.bf-faq summary::-webkit-details-marker {
  display: none;
}

.bf-faq summary::after {
  position: absolute;
  top: 17px;
  right: 6px;
  color: var(--primary-hover);
  content: "+";
  font-size: 22px;
  line-height: 1;
}

.bf-faq[open] summary::after {
  content: "−";
}

.bf-faq p {
  padding: 0 28px 18px 2px;
  line-height: 1.75;
}

.bf-related {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  padding: 28px;
  border-radius: 18px;
  background: #f7f7fb;
}

.bf-related h2 {
  margin-bottom: 8px;
  font-size: 24px;
}

.bf-related ul {
  display: grid;
  gap: 12px;
}

.bf-related a {
  font-weight: 600;
  line-height: 1.55;
}

@media (max-width: 767px) {
  .body-fat-page {
    padding: 142px 0 64px;
  }

  .bf-lede {
    font-size: 16px;
  }

  .bf-disclaimer {
    border-radius: 12px;
  }

  .bf-section-heading h2,
  .bf-results-heading h2 {
    font-size: 20px;
  }

  .bf-fields-grid {
    gap: 17px 14px;
  }

  .bf-field input {
    min-height: 48px;
  }

  .bf-related {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 22px;
  }
}

@media (max-width: 480px) {
  .body-fat-page {
    padding-top: 136px;
  }

  .bf-intro {
    margin-bottom: 25px;
  }

  .bf-intro h1 {
    font-size: 34px;
  }

  .bf-form-card {
    padding: 20px 16px;
    border-radius: 16px;
  }

  .bf-section-heading,
  .bf-results-heading {
    gap: 11px;
  }

  .bf-step {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
    border-radius: 11px;
  }

  .bf-fields-grid,
  .bf-mass-results {
    grid-template-columns: 1fr;
  }

  .bf-actions {
    align-items: stretch;
  }

  .bf-calculate {
    flex: 1 1 100%;
  }

  .bf-reset {
    flex: 1;
  }

  .bf-measurement-note {
    padding: 17px;
  }

  .bf-content {
    margin-top: 58px;
  }

  .bf-formula {
    padding: 16px;
  }

  .bf-formula code {
    font-size: 12px;
  }
}