/* 专门用于顶部导航的CSS样式 */

/* --- Navbar Styling --- */
.navbar {
  background-color: var(--navbar-bg) !important;
  border-bottom: 1px solid var(--border-color); /* Light border */
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075); /* Subtle shadow */
}

.navbar-light .navbar-brand,
.navbar-light .nav-link {
    color: var(--text-muted) !important; /* Navbar text muted gray */
    transition: color 0.15s ease-in-out;
}

.navbar-light .navbar-brand {
     color: var(--text-dark) !important; /* Brand text slightly darker */
}

.navbar-light .nav-link:hover {
    color: var(--primary-color) !important; /* Hover links become blue */
}

.navbar-light .nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 500; /* Slightly bolder active link */
}

/* Navbar Toggler */
.navbar-toggler {
    border-color: var(--border-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280, 0, 0, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Dropdown Menus in Navbar */
.dropdown-menu {
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.dropdown-item {
    color: var(--text-dark);
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--hover-bg);
    color: var(--text-dark);
}

.dropdown-item.active,
.dropdown-item:active {
    background-color: var(--primary-color);
    color: white;
}

.dropdown-divider {
    border-top: 1px solid var(--border-color);
}

/* Navbar Text */
.navbar-text {
    color: var(--text-muted);
}

/* Responsive Navigation */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: var(--content-bg);
        border: 1px solid var(--border-color);
        border-radius: 0.25rem;
        padding: 0.5rem;
        margin-top: 0.5rem;
    }
}