:root{--bg: #16181d;--panel: #1d2027;--panel-2: #23272f;--border: #2c313b;--text: #e6e8ec;--muted: #9aa3b2;--accent: #6c5ce7;--danger: #e74c3c;--radius: 8px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:14px}button{font-family:inherit;cursor:pointer}.app{display:flex;height:100vh}.sidebar{width:248px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--border);padding:16px 12px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.brand{font-size:18px;font-weight:700;padding:4px 8px 12px}.nav{display:flex;flex-direction:column;gap:2px}.nav-item{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:transparent;border:none;color:var(--text);padding:8px 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