/* 清除所有自定義樣式，用最基本的Bootstrap */
.navbar {
    padding: 0.5rem 1rem;
}

.navbar .container {
    max-width: 100%;
}

/* 重置所有導覽列樣式為Bootstrap預設 */
.navbar-nav .nav-link {
    padding: 0.5rem 1rem;
    color: rgba(255,255,255,0.9);
}

.navbar-nav .nav-link:hover {
    color: white;
    background: rgba(255,255,255,0.1);
    border-radius: 0.375rem;
}

/* 確保下拉選單容器正確定位 */
.navbar .nav-item {
    position: relative;
}

/* 下拉選單基本樣式 */
.navbar .dropdown-menu {
    position: absolute;
    z-index: 1000;
    min-width: 10rem;
    padding: 0.5rem 0;
    margin: 0.125rem 0 0;
    font-size: 1rem;
    color: #212529;
    text-align: left;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0,0,0,.15);
    border-radius: 0.375rem;
    box-shadow: 0 0.5rem 1rem rgba(0,0,0,.175);
}

/* 右對齊的下拉選單 */
.navbar .dropdown-menu-end {
    right: 0;
    left: auto;
}

/* 下拉選單項目 */
.navbar .dropdown-item {
    display: block;
    width: 100%;
    padding: 0.25rem 1rem;
    clear: both;
    font-weight: 400;
    color: #212529;
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
}

.navbar .dropdown-item:hover,
.navbar .dropdown-item:focus {
    color: #1e2125;
    background-color: #e9ecef;
}

.navbar .dropdown-item.active {
    color: #fff;
    text-decoration: none;
    background-color: #0d6efd;
}

/* 手機版調整 */
@media (max-width: 991.98px) {
    .navbar-collapse {
        border-top: 1px solid rgba(255,255,255,0.1);
        margin-top: 0.5rem;
        padding-top: 0.5rem;
    }
    
    .navbar .dropdown-menu {
        position: static;
        float: none;
        width: auto;
        margin-top: 0;
        background-color: rgba(0,0,0,0.1);
        border: 0;
        box-shadow: none;
    }
    
    .navbar .dropdown-item {
        color: rgba(255,255,255,0.9);
    }
    
    .navbar .dropdown-item:hover,
    .navbar .dropdown-item:focus {
        color: white;
        background-color: rgba(255,255,255,0.1);
    }
}