:root{--bg:#fafaf9;--card:#fff;--border:#e2e0da;--border-strong:#c9c6bc;--text:#2c2c2a;--text-secondary:#5f5e5a;--text-muted:#888780;--accent:#185fa5;--accent-bg:#e6f1fb;--danger:#993c1d;--danger-bg:#faece7;--amber:#854f0b;--amber-bg:#faeeda;--radius:10px;--sidebar-w:240px;--drawer-w:380px}*{box-sizing:border-box}html,body{height:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;overflow:hidden}#root{height:100%}.app{width:100vw;height:100vh;display:flex}.sidebar{width:var(--sidebar-w);background:var(--card);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;transition:margin-left .15s;display:flex;position:relative}.sidebar.hidden{margin-left:calc(-1 * var(--sidebar-w))}.sidebar-resize-handle{cursor:ew-resize;z-index:5;width:6px;height:100%;position:absolute;top:0;right:-3px}.sidebar-resize-handle:hover,.sidebar-resize-handle.dragging{background:var(--accent);opacity:.3}.sidebar-header{justify-content:space-between;align-items:flex-start;padding:14px 12px 10px;display:flex}.sidebar-brand{flex-direction:column;align-items:flex-start;gap:6px;min-width:0;display:flex}.sidebar-logo{width:auto;height:36px;display:block}.sidebar-title{color:#0085b6;font-size:17px;font-weight:700;line-height:1}.icon-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;padding:4px;display:inline-flex}.icon-btn:hover{background:var(--bg);color:var(--text)}.file-link-bar{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px;margin:0 0 6px;padding:6px 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6px;font-size:10.5px;font-weight:600}.tree-shared-meta{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;flex-shrink:0;max-width:40%;font-size:10px;overflow:hidden}.tree-children{margin-left:16px}.tree-empty{color:var(--text-muted);padding:4px 8px;font-size:11px;font-style:italic}.main{flex-direction:column;flex:1;min-width:0;display:flex}.home-screen{flex:1;padding:48px 32px;overflow-y:auto}.home-hero{text-align:center;max-width:520px;margin:0 auto 40px}.home-hero h1{color:var(--text);margin:0 0 8px;font-size:22px}.home-hero p{color:var(--text-secondary);margin:0 0 20px;font-size:13.5px}.access-request-form{text-align:left;flex-direction:column;gap:12px;margin:0 0 20px;display:flex}.access-request-form label{color:var(--text-secondary);flex-direction:column;gap:4px;font-size:12.5px;display:flex}.access-request-form select,.access-request-form textarea{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:6px;padding:7px 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