.water-container {
  max-width: 320px;
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  padding: 20px;
  border-radius: 15px;
  font-family: Arial, sans-serif;
  color: white;
  box-shadow: 0px 4px 10px rgba(0,0,0,0.2);
  margin: auto;
}

.water-container h2 {
  text-align: center;
  margin-bottom: 15px;
}

.water-container label {
  display: block;
  margin-top: 10px;
  font-weight: bold;
}

.water-container input, 
.water-container select {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border-radius: 8px;
  border: none;
  outline: none;
}

.water-container button {
  margin-top: 15px;
  width: 100%;
  padding: 10px;
  background-color: #004e92;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
}

.water-container button:hover {
  background-color: #003972;
}

#result, #comparison, #tips {
  margin-top: 15px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  font-size: 0.9em;
}