:root{--bg: #f5f7fa;--sidebar: #fdfdfd;--card: #ffffff;--hover: #f9fafb;--active: #f0f0f0;--border: #e5e7eb;--border-dark: #d1d5db;--text: #111827;--text-2: #6b7280;--text-muted: #9ca3af;--accent: #3b82f6;--accent-dark: #2563eb;--accent-light: #eff6ff;--success: #10b981;--success-light: #d1fae5;--warning: #f59e0b;--warning-light: #fef3c7;--error: #ef4444;--error-light: #fee2e2;--radius: 8px;--radius-sm: 6px;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow: 0 1px 3px rgba(0,0,0,.1);--sidebar-w: 220px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif}.muted{color:var(--text-2)}.small{font-size:12px}code{background:var(--active);padding:1px 5px;border-radius:4px;font-size:12px}button{font-family:inherit;cursor:pointer}button:disabled{opacity:.55;cursor:default}.app{display:flex;min-height:100vh}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-w);height:100vh;background:var(--sidebar);border-right:1px solid var(--border-dark);box-shadow:1px 0 6px #0000000a;display:flex;flex-direction:column;z-index:1000}.sidebar__brand{padding:22px 20px 16px;font-size:16px;font-weight:700;display:flex;align-items:center;gap:9px}.sidebar__brand .dot{width:9px;height:9px;border-radius:50%;background:var(--accent)}.sidebar__brand small{color:var(--text-2);font-weight:500}.sidebar__nav{flex:1;padding:6px 0}.nav-item{display:flex;align-items:center;gap:9px;width:calc(100% - 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