/* 主导航 */
.main-navigation {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100%;
    z-index: 9999 !important;
}

/* 底部导航 */
.bottom-navigation {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(17, 24, 39, 0.95);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 9998;
}

.bottom-nav-responsive {
    padding: 0.5rem 0.25rem;
}

.bottom-nav-responsive span {
    font-size: 0.7rem;
}

@media (min-width: 768px) {
    .bottom-nav-responsive span {
        font-size: 0.8rem;
    }
}