button:active {
            background-color: #1a202c; /* gray-900 */
        }
    </style>
</head>
<body>
    <div class="page-container">
        <header>
            <h1>Exploring Bézier Surfaces</h1>
            <p>Interactive examples of bicubic Bézier patches. Drag control points in leftmost canvas</p>
        </header>

        <div id="example1-container" class="visualizer-container"></div>
        <div id="example2-container" class="visualizer-container"></div>
        <div id="example3-containe