body {
  font-family: 'Poppins', sans-serif;
  background: #f8fbfd;
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}
.tab {
  background: #eee;
  padding: 10px 15px;
  border-radius: 6px;
  cursor: pointer;
}
.tab.active {
  background: #800020;
  color: white;
}
.calculator {
  background: white;
  padding: 20px;
  border-radius: 12px;
  display: none;
  flex-direction: column;
  gap: 20px;
}
.calculator.active {
  display: flex;
}
.result-box {
  background: linear-gradient(to bottom, #800020, #a52a3a);
  color: white;
  text-align: center;
  padding: 20px;
  border-radius: 12px;
}
input, select {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  width: 100%;
}
button {
  background: #800020;
  color: white;
  padding: 10px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
}
@media (max-width: 600px) {
  .tabs { flex-direction: column; }
}