:root{--bg:#f2f3f5;--panel:#fff;--ink:#26282c;--ink-soft:#5a5f66;--muted:#9096a0;--line:#e4e6ea;--line-strong:#d9dce1;--brand:#1668dc;--danger:#d5303e}*{box-sizing:border-box;margin:0;padding:0}[hidden]{display:none!important}html,body{background:var(--bg)}body{color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}header{z-index:100;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);background:#ffffffeb;align-items:center;gap:10px;height:56px;padding:0 20px;display:flex;position:fixed;top:0;left:0;right:0}.brand{white-space:nowrap;font-size:15px;font-weight:600}.brand small{color:var(--muted);margin-left:8px;font-size:12px;font-weight:400}.document-switcher{align-items:center;gap:7px;max-width:230px;padding:6px 10px;display:flex}.document-switcher span{color:var(--muted);font-size:11px}.document-switcher 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0;border:none;border-radius:6px;width:100%;padding:9px 12px;display:block}#moreMenu button:hover{background:var(--bg)}#moreMenu button.danger{color:var(--danger)}#moreMenu hr{border:none;border-top:1px solid #eceef1;margin:5px 4px}#formatBar{z-index:99;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);scrollbar-width:none;background:#ffffffeb;align-items:center;gap:1px;height:46px;padding:0 20px;display:flex;position:fixed;top:56px;left:0;right:0;overflow-x:auto}#formatBar::-webkit-scrollbar{display:none}#formatBar button{color:var(--ink);background:0 0;border:none;border-radius:6px;flex:none;padding:6px 10px;font-size:13px}#formatBar button:hover{background:var(--bg)}#formatBar .tb-format-painter.active{color:#fff;background:var(--brand)}#formatBar .tb-format-painter.active:hover{background:#0f56ba}#formatBar .tb-sep{background:var(--line);flex:none;width:1px;height:18px;margin:0 6px}#formatBar .tb-b{font-weight:700}#formatBar 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