:root{--bg-primary:#0d1117;--bg-secondary:#161b22;--bg-card:#1c2128;--border:#30363d;--text-primary:#e6edf3;--text-secondary:#8b949e;--accent:#58a6ff;--accent-hover:#79c0ff;--nav-height:56px}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;background:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}