:root{--error:#e5484d;--warning:#f5a623;--suggestion:#3b82f6}*{box-sizing:border-box}body{color:#1a1a1a;margin:0;font-family:system-ui,sans-serif}header{border-bottom:1px solid #eee;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}main{grid-template-columns:1fr 320px;gap:16px;padding:20px;display:grid}#editor{border:1px solid #ddd;border-radius:8px;min-height:300px;padding:16px;font-size:18px;line-height:1.7}#editor:empty:before{content:attr(data-placeholder);color:#aaa}.mark{cursor:pointer;border-bottom:2px solid}.mark.error{border-color:var(--error)}.mark.warning{border-color:var(--warning)}.mark.suggestion{border-color:var(--suggestion)}#panel{border-left:1px solid #eee;padding-left:16px}#findings li{border:1px solid #eee;border-radius:8px;margin-bottom:8px;padding:10px}#findings button{margin-top:6px}