body {
    font-family: "Poppins", sans-serif;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 40px 20px;
  }

  .container {
    max-width: 800px;
    margin: 0 auto;
  }

  .card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: none;
    padding: 30px;
  }

  h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.2em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
  }

  .navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.9);
    padding: 15px 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  }

  .logo {
    height: 40px;
  }

  .nav {
    margin: 0;
  }

  .navbar ul.nav {
    justify-content: flex-end;
    flex-grow: 1;
    margin-left: 20px;
  }

  .navbar a {
    color: #2c3e50 !important;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
  }

  .navbar a:hover {
    background: #2ecc71;
    color: white !important;
  }

  .form-label {
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 8px;
  }

  .form-control,
  .form-select {
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    margin-bottom: 20px;
  }

  .form-control:focus,
  .form-select:focus {
    border-color: #2ecc71;
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
  }

  button[type="submit"] {
    padding: 12px;
    background: linear-gradient(45deg, #2ecc71, #27ae60);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
    width: 100%;
  }

  button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.4);
  }

  #result {
    margin-top: 25px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    color: #2c3e50;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  }