:root{font-family:system-ui,sans-serif;color:#1a1a1a}*{box-sizing:border-box}body{margin:0;background:#fff;min-height:100vh}.app-header,.app-footer{padding:12px 16px}.app-footer{font-size:12px;color:#666;border-top:1px solid #eee;margin-top:32px}.container{max-width:960px;margin:0 auto;padding:0 16px}