.calculator-container {
  background: #ffffffd9;
  border-radius: 20px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  padding: 30px;
  max-width: 500px;
  margin: 40px auto;
}

.input-group {
  margin-bottom: 15px;
}

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

.input-group input, .input-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
}

.button-group {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

button#calculate-btn,
button.reset-btn {
  flex: 1;
  font-size: 1rem;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

button#calculate-btn {
  background: var(--primary-color);
  color: #fff;
}

button#calculate-btn:hover {
  background: #1976d2;
  transform: translateY(-2px);
}

button.reset-btn {
  background: #f05a5a;
  color: #fff;
}

button.reset-btn:hover {
  background: #d94b4b;
  transform: translateY(-2px);
}

.results {
  margin-top: 20px;
  background: #f9f9f9;
  border-radius: 12px;
  padding: 15px;
  line-height: 1.6;
}

.results span {
  font-weight: bold;
  color: var(--primary-color);
}

.hidden {
  display: none;
}

#results-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

#results-table th,
#results-table td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: center;
}

#results-table th {
  background: var(--primary-color);
  color: #fff;
}