body{font-family:Arial,Helvetica,sans-serif;margin:0;background:#fff;color:#111;text-align:center}
.container{max-width:900px;margin:auto;padding:20px}
.header{background:#fff;box-shadow:0 1px 4px rgba(0,0,0,0.1);position:sticky;top:0}
.hero{padding:60px 20px;background:#fafafa}
.btn{background:#111;color:#fff;padding:12px 20px;border-radius:8px;text-decoration:none}
.tool{padding:40px 0}
canvas{display:block;margin:10px auto;border:1px solid #ddd;border-radius:10px}
.actions button{margin:5px;padding:10px 16px;border-radius:8px;border:none;background:#111;color:#fff;cursor:pointer}
.footer{padding:20px 0;border-top:1px solid #eee;margin-top:40px}