.body-fat-calculator {
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #f1f5f9;
  padding: 2rem;
}

.body-fat-calculator .container {
  max-width: 720px;
  margin: 0 auto;
  background: #1e293b;
  padding: 2rem;
  border-radius: 8px;
}

.body-fat-calculator h1, h2, h3 {
  text-align: center;
  color: #60a5fa;
}

.body-fat-calculator label {
  display: block;
  margin-top: 1rem;
}

.body-fat-calculator input,
.body-fat-calculator select {
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.25rem;
  background: #334155;
  border: 1px solid #475569;
  border-radius: 4px;
  color: #f1f5f9;
}

.body-fat-calculator button {
  margin-top: 1rem;
  width: 100%;
  padding: 0.75rem;
  background-color: #3b82f6;
  border: none;
  border-radius: 4px;
  color: #fff;
  font-weight: bold;
  cursor: pointer;
}

.body-fat-calculator button:hover {
  background-color: #2563eb;
}

.body-fat-calculator .height-wrapper,
.body-fat-calculator .weight-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.body-fat-calculator .height-wrapper input,
.body-fat-calculator .weight-wrapper input,
.body-fat-calculator .height-wrapper select,
.body-fat-calculator .weight-wrapper select {
  flex: 1 1 100px;
}

.body-fat-calculator .result-section {
  margin-top: 2rem;
  background: #0f172a;
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid #334155;
}

.body-fat-calculator table {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
  text-align: center;
}

.body-fat-calculator th,
.body-fat-calculator td {
  padding: 0.5rem;
  border: 1px solid #334155;
}

.body-fat-calculator .active-row {
  background-color: #2563eb;
  color: #fff;
}

.hidden {
  display: none;
}