:root{--primary:#0f172a;--primary-light:#1e293b;--accent:#2563eb;--accent-hover:#1d4ed8;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--bg:#f8fafc;--card:#fff;--border:#e2e8f0;--text-main:#0f172a;--text-muted:#64748b}*{box-sizing:border-box;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}body{background:var(--bg);color:var(--text-main);min-height:100vh}button{cursor:pointer}