/* 导航栏基础 */
.nav-bar {
    background: #0052aa;
    padding: 0;
    position: relative;
}
.navbar {
    padding: 0;
    position: relative;
}
.navbar-toggler {
    display: none;
    border-color: rgba(255,255,255,0.4);
    margin-left: auto;
}
.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(255,255,255,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.nav-link {
    color: #fff !important;
    font-size: 16px;
    padding: 14px 22px !important;
    transition: background 0.2s ease;
    text-align: center;
}
.nav-link:hover {
    background: #003d80;
    color: #fff !important;
}
.navbar-collapse {
    justify-content: center;
}

@media (max-width: 992px) {
    .navbar-toggler {
        display: block;
    }
    .navbar-collapse {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #0052aa;
        z-index: 999;
        box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    }
    .navbar-nav {
        width: 100%;
        text-align: center;
    }
}
/* 移动端适配 */
@media (max-width: 768px) {
    .navbar-toggler {
        background: #0052aa;
        padding: 2px;
    }
}