:root{--bg: #f7f7f5;--surface: #ffffff;--surface-soft: #f2f2f0;--text: #202123;--text-soft: #6b6b6b;--text-faint: #9a9a97;--border: #e5e5e3;--border-strong: #d5d5d2;--accent: #10a37f;--accent-dark: #087f62;--accent-soft: #e7f5f0;--shadow: 0 18px 42px rgba(32, 33, 35, .06);--radius: 12px;--sidebar-width: 312px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body{height:100%;overflow:hidden}body{margin:0;min-width:320px;background:var(--bg)}button,textarea{font:inherit}button{border:0}button:focus-visible,textarea:focus-visible{outline:3px solid rgba(16,163,127,.22);outline-offset:2px}.app-shell{height:100vh;overflow:hidden}.topbar{display:flex;min-height:76px;align-items:center;justify-content:space-between;gap:24px;padding:16px 34px;border-bottom:1px solid var(--border);background:#ffffffd1}.brand-lockup,.topbar-meta,.nav-heading,.question-kicker,.panel-footer,.nav-actions,.keyboard-hint{display:flex;align-items:center}.brand-lockup{gap:12px}.brand-mark{display:grid;width:34px;height:34px;place-items:center;border-radius:9px;color:var(--surface);background:var(--text);font-size:17px}.brand-lockup h1,.brand-lockup p,.nav-heading h2,.question-copy h2{margin:0}.brand-lockup h1{font-size:15px;font-weight:650;letter-spacing:-.01em}.brand-lockup p{margin-top:3px;color:var(--text-soft);font-size:12px}.topbar-meta{gap:18px;color:var(--text-soft);font-size:12px}.sync-state,.presence-summary,.presence-list,.online-count{display:inline-flex;align-items:center}.sync-state{white-space:nowrap;color:var(--text-faint);font-size:12px}.sync-state[data-state=saved]{color:var(--accent-dark)}.sync-state[data-state=syncing]:before{width:5px;height:5px;margin-right:5px;border-radius:50%;background:var(--accent);content:""}.sync-state[data-state=error]{color:#b25037}.presence-summary{gap:7px;white-space:nowrap}.online-count{color:var(--text-faint);font-size:12px}.presence-list{min-width:0;padding-left:3px}.presence-avatar{display:grid;width:26px;height:26px;place-items:center;border:2px solid var(--surface);border-radius:50%;color:var(--accent-dark);background:var(--accent-soft);font-size:11px;font-weight:700}.presence-avatar+.presence-avatar{margin-left:-7px}.presence-avatar-more{color:var(--text-soft);background:var(--surface-soft);font-size:9px}.share-button{min-height:32px;padding:0 11px;white-space:nowrap}.save-state{display:inline-flex;align-items:center;gap:6px}.save-state:before{width:6px;height:6px;border-radius:50%;background:var(--accent);content:""}.topbar-count{padding-left:18px;border-left:1px solid var(--border);white-space:nowrap}.workspace{display:grid;height:calc(100vh - 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