:root{color:#20272b;font-synthesis:none;--paper:#f7f5f0;--panel:#fff;--line:#d5d8d8;--ink-soft:#667078;--blue:#1679b8;--blue-dark:#0b5e92;--orange:#e46f2b;font-family:Segoe UI,Arial,sans-serif}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden}button,input,textarea{font:inherit}button{color:inherit}.topbar{background:var(--paper);z-index:10;border-bottom:1px solid #c9cccd;justify-content:space-between;align-items:center;height:62px;padding:0 18px;display:flex;position:relative;box-shadow:0 1px 5px #1e262a1a}.brand{align-items:center;gap:11px;display:flex}.brand-mark{color:#fff;background:var(--orange);letter-spacing:-1px;border-radius:8px 8px 8px 2px;place-items:center;width:38px;height:38px;font-weight:800;display:grid}.brand div{gap:2px;display:grid}.brand strong{font-size:16px}.brand #file-name{color:var(--ink-soft);font-size:12px}.file-actions{align-items:center;gap:8px;display:flex}.top-menu{position:relative}.menu-caret{margin-left:5px;display:inline-block;transform:rotate(90deg)}.top-menu-panel{z-index:30;background:#fff;border:1px solid #c8ced0;border-radius:7px;gap:8px;width:210px;padding:10px;display:grid;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 10px 28px #202a2f2e}.top-menu-panel[hidden]{display:none}.top-menu-panel label{color:#5d686e;font-size:11px;font-weight:800}.top-menu-panel select{background:#fff;border:1px solid #aeb8bc;border-radius:5px;height:34px}.options-help{justify-content:flex-end;display:flex;position:relative}.help-dot{width:26px;height:26px;color:var(--blue-dark);cursor:help;background:#eef7fb;border:1px solid #9fb5c3;border-radius:50%;place-items:center;font-weight:800;display:grid}.options-tooltip{z-index:40;color:#2d373c;background:#fff;border:1px solid #b8c5cb;border-radius:7px;gap:5px;width:250px;padding:10px;font-size:12px;line-height:1.35;display:none;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 10px 26px #202a2f33}.options-tooltip strong,.options-tooltip span{display:block}.help-dot:hover+.options-tooltip,.help-dot:focus+.options-tooltip{display:grid}.top-menu-panel .top-button{text-align:left;width:100%}.top-button,.action-button{cursor:pointer;background:#fff;border:1px solid #bfc5c7;border-radius:6px;padding:9px 14px;font-weight:600}.top-button:hover{background:#eef2f3}.top-button:disabled{color:#9aa3a8;cursor:default;background:#e7eaeb}.top-button.danger{color:#8b3d18;border-color:#cfb4a3}.top-button.danger:hover:not(:disabled){color:#fff;background:var(--orange);border-color:#bf561f}.top-button.primary,.action-button{color:#fff;border-color:var(--blue-dark);background:var(--blue)}.top-button.primary:hover,.action-button:hover{background:var(--blue-dark)}.button-icon{border:1px solid;border-radius:4px;place-items:center;width:20px;height:20px;margin-right:4px;font-size:11px;display:inline-grid}#workspace{grid-template-columns:76px minmax(0,1fr);height:calc(100% - 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