<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>リアルタイム多面体球体 (修正版) - 2D Canvas</title>
    <style>
        body { margin: 0; overflow: hidden; background: #f0f0f0; }
        #controls { position: absolute; top: 10px; left: 10px; background: rgba(255,255,255,0.7); padding: 10px; }
        label { display: inline-block; width: 120px; }
    </style>
</head>
<body>
    <div id="con