:root{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--text-primary:#1e293b;--text-secondary:#475569;--text-muted:#94a3b8;--border-color:#e2e8f0;--accent-color:#3b82f6;--accent-hover:#2563eb;--shadow-sm:0 1px 2px rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);--shadow-xl:0 20px 25px -5px rgba(0,0,0,.1),0 10px 10px -5px rgba(0,0,0,.04);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--transition-fast:150ms ease;--transition-normal:250ms ease;--transition-slow:350ms ease}.dark-mode{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f1f5f9;--text-secondary:#cbd5e1;--text-muted:#64748b;--border-color:#334155;--shadow-sm:0 1px 2px rgba(0,0,0,.3);--shadow-md:0 4px 6px -1px rgba(0,0,0,.4);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.5)}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;background:var(--bg-primary);color:var(--text-primary);margin:0;padding:0;transition:background var(--transition-normal),color var(--transition-normal)}*{box-sizing:border-box}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}