/* General Styles */
body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background: #f4f6f8;
    color: #2c3e50;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
   }
   
   
   .container {
    max-width: 900px;
    margin: 20px;
    padding: 20px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
   }
   
   
   h1 {
    font-size: 24px;
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
   }
   
   
   /* Formula Selection */
   .formula-selection {
    margin-bottom: 20px;
   }
   
   
   label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #34495e;
   }
   
   
   select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    appearance: none; /* Remove default arrow */
    background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%233498db"><path d="M7.41 8.59L12 13.17l4.59-4.58L18 10l-6 6-6-6 1.41-1.41z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
   }
   
   
   select:focus {
    border-color: #3498db;
    outline: none;
   }
   
   
   /* Input Fields */
   .input-group {
    margin-bottom: 20px;
   }
   
   
   .input-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: #34495e;
    font-weight: 500;
   }
   
   
   input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
   }
   
   
   input[type="number"]:focus {
    border-color: #3498db;
    outline: none;
   }
   
   
   /* Button Styles */
   button {
    background: #3498db;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.3s ease;
    width: 100%;
    margin-bottom: 15px;
   }
   
   
   button:hover {
    background: #2980b9;
   }
   
   
   /* Result Display */
   .result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    background: #f8f9fa;
    border-left: 4px solid #3498db;
   }
   
   
   .result i {
    font-size: 20px;
   }
   
   
   /* Responsive Design */
   @media (max-width: 600px) {
    .container {
    padding: 10px;
    margin: 10px;
    }
   
   
    h1 {
    font-size: 22px;
    }
   }