body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f4f6fa;
  margin: 0;
  padding: 0;
  color: #1e293b;
}

.calculator-container {
  max-width: 960px;
  margin: 40px auto;
  padding: 30px;
  background: #ffffff;
  border-radius: 14px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
}

h1 {
  font-size: 28px;
  color: #1e3a8a;
  text-align: center;
  margin-bottom: 30px;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  font-weight: 600;
  display: block;
  margin-bottom: 8px;
  color: #334155;
}

input[type="number"],
select {
  width: 100%;
  padding: 5px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background-color: #f8fafc;
  font-size: 16px;
  transition: border-color 0.3s;
}

input[type="number"]:focus,
select:focus {
  border-color: #2563eb;
  outline: none;
}

button#calculateBtn {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  background-color:#E21C2A;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin-top: 15px;
}

button#calculateBtn:hover {
  background-color: #E21C2A;
}

.charts-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  margin-top: 30px;
}

.chart-box {
  flex: 1 1 45%;
  min-width: 320px;
  height: 300px;
  background: #f1f5f9;
  border-radius: 10px;
  padding: 12px;
}

.summary {
  margin-top: 30px;
  padding: 20px;
  background: #fef9c3;
  border-radius: 12px;
  border: 1px solid #fde68a;
}

.summary h3 {
  font-size: 22px;
  margin-bottom: 10px;
  color: #ca8a04;
}

.summary p {
  font-size: 16px;
  color: #78350f;
  margin: 4px 0;
}