.calc-box {
  max-width: 620px;
  margin: 40px auto;
  background: #ffffff;
  border-radius: 24px;
  box-shadow: 0 15px 50px rgba(0, 102, 0, 0.15);
  overflow: hidden;
  font-family: Arial, sans-serif;
}

.calc-box h2 {
  text-align: center;
  color: #006600;
  font-size: 26px;
  margin: 35px 0 8px;
}

.calc-subtitle {
  text-align: center;
  color: #555;
  font-size: 16px;
  margin-bottom: 30px;
}

.calc-inputs {
  padding: 0 35px;
}

.input-row {
  margin-bottom: 22px;
}

.input-row label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: #333;
}

.input-row input,
.input-row select {
  width: 100%;
  padding: 14px 16px;
  font-size: 18px;
  border: 2px solid #006600;
  border-radius: 12px;
}

.calc-options {
  padding: 20px 35px;
  background: #f8fff8;
}

.calc-options label {
  display: block;
  margin: 12px 0;
  font-size: 17px;
  cursor: pointer;
}

.calc-btn {
  width: 100%;
  background: linear-gradient(#006600, #008000);
  color: white;
  border: none;
  padding: 18px;
  font-size: 20px;
  font-weight: bold;
  border-radius: 14px;
  cursor: pointer;
  margin: 20px 35px;
}

.calc-btn:hover {
  background: linear-gradient(#005000, #006600);
  transform: translateY(-2px);
}

.calc-result {
  margin: 10px 35px 40px;
  padding: 25px;
  background: #e6f5e6;
  border-radius: 14px;
  text-align: center;
  font-size: 28px;
  font-weight: bold;
  color: #006600;
  min-height: 80px;
  border: 2px solid #006600;
}