:root{--primary: #2563eb;--primary-hover: #1d4ed8;--accent: #3b82f6;--bg-main: #f9fafb;--bg-surface: #ffffff;--bg-hover: #f3f4f6;--text-main: #111827;--text-muted: #6b7280;--border: #e5e7eb;--sidebar-width: 200px;--sidebar-collapsed-width: 72px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--radius-sm: 6px;--radius-md: 10px;--transition: .25s ease-in-out}body.dark-mode{--bg-main: #0F172A;--bg-surface: #1E293B;--bg-hover: #334155;--text-main: #F9FAFB;--text-muted: #94A3B8;--border: #334155}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--bg-main);color:var(--text-main);overflow:hidden;transition:background-color .3s ease,color .3s ease}