.theme-toggle-fixed{position:fixed;bottom:20px;right:20px;background-color:var(--primary);color:var(--bg);border:none;border-radius:50%;width:45px;height:45px;font-size:1.4rem;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 8px rgba(0,0,0,.3);transition:all .3s ease;z-index:1000;cursor:pointer}.theme-toggle-fixed:hover{transform:scale(1.1);box-shadow:0 6px 12px rgba(0,0,0,.4)}body,html{height:100%;background-color:var(--bg);color:var(--text);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;transition:background-color .3s,color .3s}:root{--bg:#ffffff;--text:#000000;--primary:#00ffff;--accent:#f0ffff}[data-theme=dark]{--bg:#000000;--text:#ff4d4d;--primary:#ff4d4d;--accent:#1a1a1a}.navbar{background-color:var(--bg);color:var(--text);padding:1rem 2rem;border-bottom:1px solid #ccc;position:-webkit-sticky;position:sticky;top:0;z-index:100}.navbar-container{display:flex;justify-content:space-between;align-items:center}.logo{font-weight:700;font-size:1.3rem;text-decoration:none;color:var(--text)}.nav-links{list-style:none;display:flex;gap:1.5rem}.nav-links li{position:relative}.nav-links a{text-decoration:none;color:var(--text)}.hamburger{display:none;background:none;font-size:1.5rem;cursor:pointer;border:none;color:var(--text)}.services-dropdown .submenu{display:none;position:absolute;top:2rem;left:0;background-color:var(--bg);padding:.5rem;border:1px solid #ddd;z-index:10}.services-dropdown .submenu.show,.services-dropdown:hover .submenu{display:block}.submenu li{margin:.3rem 0}.nested-submenu{margin-left:1rem}@media (max-width:768px){.hamburger{display:block}.nav-links{display:none;flex-direction:column;gap:1rem;background-color:var(--bg);padding:1rem;position:absolute;top:60px;right:20px;border:1px solid #ccc}.nav-links.open{display:flex}}.nav-links a:hover{color:var(--primary);text-decoration:underline;transition:.3s}