.bottomNav {
    width: 100%;
    height: 34.5rem;
    background: #025286;
    padding: 1rem 15rem 0;
    position: relative;
    margin: 0 auto;
}

.f1 {
    font-size: 1.25rem;
    font-family: PingFang SC;
    font-weight: 500;
    color: #666666;
    cursor: pointer;
}

.f2 {
    font-family: Microsoft YaHei;
    font-weight: bold;
    font-size: 1.5rem;
    color: #FFFFFF;
    margin-bottom: 2rem;
    cursor: pointer;
}

.f3 {
    font-family: Microsoft YaHei;
    font-weight: 400;
    font-size: 1.25rem;
    color: #FFFFFF;
    line-height: 2.81rem;
    margin-bottom: 1rem;
}

.f4 {
    font-family: Microsoft YaHei;
    font-weight: 400;
    font-size: 1.25rem;
    color: #FFFFFF;
    position: absolute;
    bottom: 2rem;
    cursor: pointer;
}

.b-box-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-top: 3rem;
}

.b-box-content .item {
    display: flex;
    flex-direction: column;
    align-items: start;
    flex: 1;
}

.b-box-content .item a{
    text-decoration: none;
}

.b-box-content .item:last-child {
    flex: 2;
}

.img1 {
    width: 7rem;
    height: 7rem;
    margin-right: 2rem;
}

/* 单行省略号效果 */
.text-ellipsis {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 28rem;
    cursor: pointer;
    position: relative;
}

/* 悬浮气泡框效果 */
.text-ellipsis:hover::after {
    content: attr(title);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    padding: 0.8rem 1.2rem;
    border-radius: 6px;
    font-size: 0.9rem;
    white-space: normal;
    width: max-content;
    max-width: 300px;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

/* 气泡框箭头 */
.text-ellipsis:hover::before {
    content: '';
    position: absolute;
    bottom: calc(100% - 5px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    z-index: 1001;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .bottomNav {
        width: 100%;
        padding: 1rem 2rem 0;
        height: auto;
        min-height: 34.5rem;
    }
    
    .b-box-content {
        flex-wrap: wrap;
    }
    
    .b-box-content .item {
        flex: 1 1 45%;
        margin-bottom: 2rem;
    }
    
    .b-box-content .item:last-child {
        flex: 1 1 100%;
    }
}

@media (max-width: 768px) {
    .bottomNav {
        padding: 1rem 1rem 0;
    }
    
    .b-box-content .item {
        flex: 1 1 100%;
    }
    
    .f2 {
        font-size: 1.25rem;
    }
    
    .f3 {
        font-size: 1rem;
    }
    
    .f4 {
        font-size: 1rem;
        bottom: 2rem;
    }
}