:root{--bg: #f6f7f9;--surface: #ffffff;--border: #e2e5ea;--text: #1c1f24;--text-muted: #6b7280;--primary: #3b6fe0;--primary-hover: #2f5cc4;--danger: #d64545;--danger-hover: #b93a3a;--sidebar-bg: #fbfbfc;--shadow: 0 4px 16px rgba(20, 24, 32, .08);--radius: 10px}@media (prefers-color-scheme: dark){:root{--bg: #16181d;--surface: #1e2127;--border: #2c3038;--text: #eceef1;--text-muted: #9aa1ac;--primary: #5b8bf0;--primary-hover: #6f99f2;--sidebar-bg: #1a1c21;--shadow: 0 4px 20px rgba(0, 0, 0, .35)}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}button{font-family:inherit}.muted{color:var(--text-muted)}.small{font-size:12.5px}.app-shell{display:grid;grid-template-columns:240px 1fr;height:100vh}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);padding:16px 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