:root{--bg:#f3f4f6;--panel:#fff;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#2563eb;--accent-soft:#dbeafe;--danger:#dc2626;--radius:10px;color:var(--ink);-webkit-tap-highlight-color:transparent;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body{overscroll-behavior:none;background:var(--bg);height:100%;margin:0;overflow:hidden}.app{touch-action:pan-y}.sidebar,.note-list,.book-panel{overscroll-behavior:contain}#app{height:100%}button{font:inherit;color:inherit}.app{flex-direction:column;height:100dvh;display:flex}.toolbar{background:var(--panel);border-bottom:1px solid var(--line);-webkit-user-select:none;user-select:none;flex-wrap:wrap;align-items:center;gap:2px 4px;min-height:54px;padding:6px 8px;display:flex}.toolbar .group{align-items:center;gap:2px;display:flex}.toolbar [hidden]{display:none!important}.toolbar .sep{background:var(--line);flex:none;width:1px;height:28px;margin:0 2px}.toolbar 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