:root{--background:#f8fafc;--foreground:#0f172a;--primary:#4f46e5;--primary-hover:#4338ca;--sidebar-bg:#1e293b;--sidebar-fg:#f8fafc;--surface:#fff;--border:#e2e8f0;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:#3b82f6;--radius:0.5rem;--shadow-sm:0 1px 2px 0 rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -4px rgba(0,0,0,.1)}@media (prefers-color-scheme:dark){:root{--background:#0f172a;--foreground:#f8fafc;--primary:#6366f1;--primary-hover:#818cf8;--sidebar-bg:#020617;--surface:#1e293b;--border:#334155}}body,html{margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--background);color:var(--foreground)}*,:after,:before{box-sizing:border-box}a{text-decoration:none}a,button{color:inherit}button{background:none;border:none;cursor:pointer;font:inherit}.btn-primary{background-color:var(--primary);color:#fff;padding:.5rem 1rem;border-radius:var(--radius);font-weight:500;transition:background-color .2s}.btn-primary:hover{background-color:var(--primary-hover)}.page-container{min-height:100vh;display:flex;flex-direction:column}