* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(to bottom right, #f0fbff, #ffffff);
    padding: 0;
    color: #0b2545;
  }
  
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  
  .navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
  }
  
  .navbar-icon {
    font-size: 1.8rem;
    color: #ffffff;
  }
  
  .navbar-title {
    font-family: 'Poppins', sans-serif;
    color: white;
    text-decoration: none;
  }
  
  .navbar-tabs {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
  }
  
  .navbar-tab a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
  }
  
  .navbar-tab a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
  }
  
  .navbar-tab.active a {
    background-color: rgba(7, 239, 247, 0.25);
    color: white;
    font-weight: 600;
  }
  
  .container {
    max-width: 700px;
    margin: 40px auto;
    background: rgb(192, 238, 241);
    padding: 40px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.8s ease;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  h1 {
    text-align: center;
    color: #0b2545;
    margin-bottom: 30px;
    font-size: 2.5rem;
  }
  
  .input-group {
    margin-bottom: 25px;
  }
  
  .input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
  }
  
  .input-group input[type="range"] {
    width: 100%;
    margin-bottom: 5px;
  }
  
  .value-input {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #155e75;
    border-radius: 8px;
    background-color: #ffffff;
    cursor: pointer;
    text-align: right;
    color: #0b2545;
  }
  
  .value-input:focus {
    outline: none;
    background-color: #19d37c;
    border-color: #4a90e2;
  }
  
  .result {
    margin-top: 30px;
    background-color: #e0f2ff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 0 8px rgba(13, 71, 161, 0.15);
  }
  
  .result h2 {
    color: #007acc;
    margin-bottom: 15px;
    font-size: 1.5rem;
  }
  
  .result p {
    font-size: 1rem;
    margin: 10px 0;
    color: #1e293b;
  }
  
  canvas {
    display: block;
    margin: 40px auto 0 auto;
    max-width: 100%;
    height: auto;
  }
  
  @media screen and (max-width: 768px) {
    .navbar {
      flex-direction: column;
      align-items: flex-start;
      padding: 1rem;
    }
  
    .navbar-tabs {
      flex-direction: column;
      width: 100%;
      gap: 0.5rem;
    }
  
    .navbar-tab a {
      width: 100%;
      justify-content: flex-start;
    }
  
    .container {
      margin: 20px;
      padding: 20px;
    }
  
    h1 {
      font-size: 2rem;
    }
  }