body {
  font-family: Arial, sans-serif;
  background: #f7f7f7;
  margin: 0;
}
.container {
  max-width: 960px;
  margin: auto;
  padding: 20px;
}
header {
  background: #4CAF50;
  color: white;
  text-align: center;
  padding: 30px 20px;
  border-radius: 8px;
}
.tabs {
  display: flex;
  background: #f0f0f0;
  border-bottom: 1px solid #ccc;
  border-radius: 8px 8px 0 0;
  overflow: auto;
}
.tab-btn {
  flex: 1;
  padding: 15px;
  text-align: center;
  font-weight: bold;
  background: none;
  border: none;
  cursor: pointer;
}
.tab-btn.active {
  background: white;
  border-bottom: 3px solid #4CAF50;
  color: #4CAF50;
}
.tab-container {
  background: white;
  border-radius: 0 0 8px 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.tab-content {
  display: none;
  padding: 20px;
}
.tab-content.active {
  display: block;
}
.converter-container {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 15px;
}
.input-group {
  flex: 1;
  min-width: 280px;
}
input, select {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.equals {
  font-size: 1.5rem;
  font-weight: bold;
}
.formula-container {
  margin-top: 20px;
  background: #f9f9f9;
  padding: 15px;
  border-radius: 4px;
}
.faq {
  margin-top: 40px;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.faq h3 {
  color: #4CAF50;
  margin-bottom: 20px;
}
.faq-question {
  font-weight: bold;
  margin-top: 15px;
}
.faq-answer {
  margin-bottom: 10px;
  color: #555;
}
footer {
  margin-top: 30px;
  background: #333;
  color: white;
  text-align: center;
  padding: 20px;
  border-radius: 8px;
}