body{font:15px/1.5 system-ui,sans-serif;max-width:900px;margin:0 auto;padding:20px;color:#1a1a1a}
h1{font-size:22px}h2{font-size:17px;margin-top:28px;border-bottom:1px solid #ddd}
button{margin:4px 6px 4px 0;padding:8px 12px;border:1px solid #888;border-radius:6px;background:#f5f5f5;cursor:pointer}
input{padding:6px;margin:3px;border:1px solid #aaa;border-radius:4px}
code,#log{font:12px ui-monospace,monospace}#log{background:#111;color:#9f9;padding:10px;max-height:260px;overflow:auto;list-style:none}
nav a{margin-right:14px}.spacer{height:2600px;background:linear-gradient(#fff,#eef)}