/* Navbar Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease-in-out;
    padding: 1rem 0;
    background-color: var(--bg-color, #ffffff);
}

.navbar-scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Theme Button Styles */
.theme-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.5em;
    height: 1.5em;
    margin: -0.75em 0 0 -0.75em;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s ease infinite;
}

/* Navigation Tabs */
.nav-tabs {
    border-bottom: 1px solid var(--border-color, #dee2e6);
}

.nav-tabs .nav-link {
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.nav-tabs .nav-link.active {
    border-bottom-color: var(--primary-color, #007bff);
    color: var(--primary-color, #007bff);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}