.roi-calculator-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 2rem;
  max-width: 1200px;
  margin: auto;
  background: #f9fafb;
}

.roi-form, .roi-result {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #4f46e5;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

input[type="number"] {
  width: 100%;
  padding: 0.75rem;
  margin-top: 0.5rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-size: 1rem;
  box-sizing: border-box;
}

button.calculate-btn {
  background-color: #4f46e5;
  color: white;
  padding: 0.8rem 1.5rem;
  margin-right: 0.5rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

button.calculate-btn:hover {
  background-color: #4338ca;
}

button.reset-btn {
  background-color: #9ca3af;
  color: white;
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

button.reset-btn:hover {
  background-color: #6b7280;
}

.savings-amount {
  font-size: 2.5rem;
  color: #16a34a;
  margin: 2rem 0;
  font-weight: bold;
}

.summary {
  margin-top: 2rem;
}

.summary h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.summary ul {
  list-style: none;
  padding: 0;
}

.summary li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.small-tip {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: #6b7280;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (max-width: 768px) {
  .roi-calculator-container {
    grid-template-columns: 1fr;
  }

  .savings-amount {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.4rem;
  }
  .form-group > label {
    font-size: 0.95rem;
  }
  .roi-calculator-container {
    text-align: center;
  }
}