.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: background-color 0.3s ease;
}

.header .navbar {
    padding: 1rem 2rem;
}

.header .nav-link {
    transition: color 0.3s ease !important;
    font-weight: 500;
}

.header .nav-link i {
    transition: color 0.3s ease !important;
}

.header[data-theme="dark"] .nav-link {
    color: #ffffff !important;
}

.header[data-theme="light"] .nav-link {
    color: #212529 !important;
}

.header .navbar-brand img {
    transition: opacity 0.3s ease;
}

.header .dropdown-menu {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}