* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
  }
  
  body {
    min-height: 100vh;
    background: linear-gradient(45deg, #667eea, #a40ab7 );
  }
  
  nav.navbar {
    background-color: #ffffff;
    padding: 10px 20px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo img {
    max-width: 150px;
  }
  
  nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
  }
  
  nav ul li {
    margin: 0 20px;
  }
  
  nav ul li a {
    text-decoration: none;
    color: #4a00e0;
    font-size: 1.2em;
    transition: color 0.3s ease;
  }
  
  nav ul li a:hover {
    color: #1e90ff;
  }
  
  .nav-icons {
    display: flex;
    gap: 10px;
  }
  
  .nav-icons a {
    color: #4a00e0;
    font-size: 1.2em;
    text-decoration: none;
  }
  
  .register-btn {
    background-color: #c5b2c8;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
  }
  
  .container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 400px;
    margin: 120px auto 20px auto;
  }
  
  h1 {
    color: white;
    text-align: center;
    margin-bottom: 1.5rem;
    font-weight: 600;
  }
  
  .input-group {
    margin-bottom: 1.5rem;
  }
  
  label {
    display: block;
    color: white;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
  }
  
  input {
    width: 100%;
    padding: 0.8rem;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
  }
  
  input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
  }
  
  button {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    background: #4a5568;
    color: white;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
  }
  
  button:hover {
    background: #2d3748;
    transform: translateY(-2px);
  }
  
  #result {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    color: white;
  }
  
  .bmi-scale {
    margin-top: 1.5rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
  }
  
  .scale-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: white;
  }
  
  .category {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-top: 0.5rem;
  }
  
  .description-box {
    margin: 0 auto 30px auto;
    width: 90%;
    max-width: 600px;
    padding: 15px;
    border: 2px dotted #4285F4;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    color: #333;
  }
  
  .description-box h2 {
    margin-top: 0;
    font-size: 18px;
    color: #4285F4;
  }
  
  .description-box p {
    font-size: 14px;
    line-height: 1.6;
  }