* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Quicksand', sans-serif;
    background: linear-gradient(to right top, #2853c0, #fad0c4, #b03b1b);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
  }
  
  .container {
    background: white;
    padding: 30px 25px;
    border-radius: 20px;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.8s ease-out;
  }
  
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  h1 {
    text-align: center;
    font-size: 35px;
    color: #333;
    margin-bottom: 10px;
  }
  
  .description {
    text-align: center;
    color: #777;
    margin-bottom: 25px;
    font-size: 18px;
  }
  
  .input-group {
    margin-bottom: 20px;
  }
  
  .input-group label {
    font-weight: 600;
    color: #444;
    display: block;
    margin-bottom: 8px;
  }
  
  input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #f3a683;
    border-radius: 10px;
    background: #fff0f5;
    font-size: 15px;
    transition: 0.3s ease;
  }
  
  input[type="number"]:focus {
    outline: none;
    border-color: #ff6b81;
    background: #fff;
  }
  
  button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(to right, #ff6b81, #f3a683);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
  }
  
  button:hover {
    background: linear-gradient(to right, #f3a683, #ff6b81);
  }
  
  .result-box {
    margin-top: 25px;
    padding: 20px;
    border-radius: 15px;
    background: #f8edeb;
    color: #222;
    font-size: 18px;
    font-weight: 600;
    text-align: center;
    min-height: 70px;
    transition: all 0.4s ease;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    position: relative;
    z-index: 1;
    border: 2px solid transparent;
    overflow: hidden;
  }
  
  .result-box::before {
    content: "";
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #ff9a9e, #fad0c4, #fbc2eb, #a18cd1);
    z-index: -1;
    filter: blur(8px);
    opacity: 0.6;
    border-radius: 15px;
    animation: pulseGlow 2s infinite ease-in-out;
  }
  
  @keyframes pulseGlow {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
  }
  
  .result-box.hidden {
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
  }
  
  .result-box.show {
    animation: slideIn 0.5s forwards;
  }