body {
      margin: 0;
      font-family: Arial, sans-serif;
      background-color: #f4f4f4;
    }
    header {
      background: #1a1a1a;
      color: white;
      padding: 1rem 2rem;
      display: flex;
      justify-content: flex-start;
      align-items: center;
      gap: 2rem;
      position: sticky;
      top: 0;
      z-index: 1000;
    }
    nav {
      position: relative;
    }
    nav a, .dropdown > a {
      color: white;
      text-decoration: none;
      font-weight: bold;
      padding: 0.5rem 1rem;
      border-radius: 5px;
    }
    nav a:hover, .dropdown:hover > a {
      background-color: #333;
    }
    .dropdown {
      position: relative;
      display: inline-block;
	  z-index: 9999;
    }
    .dropdown-content {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      background-color: #333;
      padding: 0.5rem 0;
      min-width: 150px;
      z-index: 9999;
      border-radius: 5px;
    }
    .dropdown-content a {
      display: block;
      padding: 0.5rem 1rem;
    }
    .dropdown-content a:hover {
      background-color: #555;
    }
    .dropdown:hover .dropdown-content {
      display: block;
    }
    .hero {
      height: 10vh;
      background: url('https://via.placeholder.com/1600x900') center/cover no-repeat;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      color: red;
      text-shadow: 0 2px 5px rgba(0,0,0,0.6);
      padding: 2rem;
      text-align: center;
    }
    .hero h1 {
      font-size: 3rem;
      margin-bottom: 1rem;
    }
    .hero p {
      font-size: 1.5rem;
      max-width: 700px;
    }
	
	 .hero h1 {
      font-size: 3rem;
      margin-bottom: 1rem;
    }

	  .formula {
      padding: 2rem;
      max-width: 300px;
      background: orange;
      border-radius: 10px;
      margin-bottom: 2rem;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
      position: relative;
    }
    .content {
      padding: 0.5rem;
      max-width: 900px;
      margin: auto;
      background: white;
      border-radius: 10px;
      margin-top: 1rem;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
      position: relative;
    }
    input {
      padding: 0.5rem;
      width: 200px;
      margin-bottom: 1rem;
      border: 1px solid #ccc;
      border-radius: 5px;
    }
    button {
      padding: 0.5rem 1rem;
      margin-right: 1rem;
      border: none;
      border-radius: 5px;
      background-color: #1a1a1a;
      color: white;
      font-weight: bold;
      cursor: pointer;
      transition: background-color 0.3s;
    }
    button:hover {
      background-color: #333;
    }
    .result {
      font-weight: bold;
      margin-top: 0.5rem;
      color: #1a1a1a;
    }
    canvas {
      margin-top: 1rem;
      width: 100%;
      max-width: 800px;
      height: 250px;
      border: 1px solid #ccc;
      border-radius: 5px;
      background: #f9f9f9;
    }
		footer {
            background-color: #f1f1f1;
            text-align: center;
            padding: 15px;
            font-size: 0.9em;
            color: #333;
        }