/* Bootstrap 5 原生多選 Select 元素樣式 */
.form-select[multiple] {
    min-height: 120px;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    border: 1px solid #ced4da;
    border-radius: 0.375rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-select[multiple]:focus {
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-select[multiple] option {
    padding: 0.25rem 0.5rem;
    margin: 0.125rem 0;
    border-radius: 0.25rem;
    transition: background-color 0.15s ease-in-out;
}

.form-select[multiple] option:hover {
    background-color: #e9ecef;
}

.form-select[multiple] option:checked {
    background-color: #0d6efd;
    color: #fff;
}

.form-select[multiple] option:checked:hover {
    background-color: #0b5ed7;
}

/* 自定義多選容器樣式 */
.multi-select-container {
    position: relative;
}

.multi-select-container .form-select[multiple] {
    width: 100%;
}

/* 多選標籤樣式 */
.multi-select-container .selected-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.5rem;
}

.multi-select-container .selected-item {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    color: #495057;
}

.multi-select-container .selected-item .remove-item {
    margin-left: 0.25rem;
    cursor: pointer;
    color: #6c757d;
    font-weight: bold;
}

.multi-select-container .selected-item .remove-item:hover {
    color: #dc3545;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .form-select[multiple] {
        min-height: 100px;
        font-size: 0.875rem;
    }
}

/* 深色主題支援 */
@media (prefers-color-scheme: dark) {
    .form-select[multiple] {
        background-color: #212529;
        border-color: #495057;
        color: #f8f9fa;
    }
    
    .form-select[multiple] option {
        background-color: #212529;
        color: #f8f9fa;
    }
    
    .form-select[multiple] option:hover {
        background-color: #495057;
    }
    
    .form-select[multiple] option:checked {
        background-color: #0d6efd;
        color: #fff;
    }
}