:root{color-scheme:light dark}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif}main{max-width:640px;margin:0 auto;padding:24px 16px 48px;line-height:1.6}h1{margin:0 0 4px;font-size:28px}h2{margin:24px 0 8px;font-size:16px;color:#666}.muted{color:#888}.error{color:#c00}input{display:block;width:100%;max-width:360px;padding:8px;margin:6px 0;font-size:15px}textarea{display:block;width:100%;max-width:480px;padding:8px;margin:6px 0;font:13px/1.4 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;resize:vertical}label.字段{display:block;margin:6px 0}button{padding:8px 14px;font-size:15px}ul{padding-left:20px}