.intro-title span {
    font-size: 14px;
    color: #666;
    display: block;
    margin-top: 8px;
}

.section-header small {
    font-size: 16px;
    color: #999;
    display: block;
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding-top: 20px;
}
.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: #0066cc;
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}
.timeline-item {
    padding: 10px 20px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}
.timeline-item::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background-color: #fff;
    border: 2px solid #0066cc;
    border-radius: 50%;
    top: 15px;
    z-index: 1;
}
.timeline-left {
    left: 0;
}
.timeline-right {
    left: 50%;
}
.timeline-left::after {
    right: -8px;
}
.timeline-right::after {
    left: -8px;
}
.timeline-content {
    padding: 20px;
    background-color: white;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.timeline-year {
    font-size: 18px;
    font-weight: bold;
    color: #0066cc;
    margin-bottom: 8px;
}
.timeline-tag {
    font-size: 13px;
    color: #fff;
    background-color: #0066cc;
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    margin-bottom: 10px;
}
.timeline-desc {
    font-size: 13px;
    color: #666;
    line-height: 1.7;
}

/* 企业文化 */
.culture-section {
    padding: 50px 0;
}
.culture-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}
.culture-img {
    width: 100%;
    height: 300px;
    /*background: url('https://via.placeholder.com/600x280/e6f7ff/333333?text=Corporate+Culture') no-repeat center center;*/
    background-size: cover;
    border-radius: 8px;
}
.culture-core {
    font-size: 20px;
    color: #1a36b2;
    margin-bottom: 15px;
}
.culture-core span {
    color: #333;
}
.culture-values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 20px;
}
.culture-card {
    background-color: #f0f7ff;
    padding: 15px;
    border-radius: 6px;
}
.culture-card h4 {
    font-size: 14px;
    color: #1a36b2;
    margin-bottom: 8px;
}
.culture-card p {
    font-size: 13px;
    color: #666;
}
.culture-arrow {
    text-align: center;
    color: #ccc;
    font-size: 20px;
    margin: 0 10px;
}

/* 轮播通用样式 */
.carousel-section {
    padding: 40px 0;
    background-color: #f9fbfe;
}
.carousel-container {
    position: relative;
    /*max-width: 1100px;*/
    margin: 0 auto;
}
.carousel-wrapper {
    overflow: hidden;
}
.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}
.carousel-item {
    flex: 0 0 25%; /* 一行4个 */
    padding: 0 10px;
}


.carousel-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    display: block;
}
.cert-item img {
    height: 300px;
    object-fit: contain;
    background-color: #fff;
    padding: 0px;
}


.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background-color: rgba(0,102,204,0.7);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background-color 0.3s;
}
.carousel-btn:hover {
    background-color: #0066cc;
}
.carousel-prev {
    left: -20px;
}
.carousel-next {
    right: -20px;
}
.carousel-caption2 {
    text-align: center;
    font-size: 13px;
    color: #666;
    margin-top: 8px;
}




/* 响应式适配 */
@media (max-width: 992px) {
    .timeline::after {
        left: 31px;
    }
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    .timeline-item::after {
        left: 22px;
    }
    .timeline-right {
        left: 0%;
    }
    .timeline-left::after, .timeline-right::after {
        right: auto;
        left: 22px;
    }
    .carousel-item {
        flex: 0 0 33.333%; /* 一行3个 */
    }
    .footer .container {
        grid-template-columns: 1fr 1fr;
    }

}

@media (max-width: 768px) {
    .main-menu {
        gap: 15px;
        font-size: 13px;
    }
    .sub-nav ul {
        gap: 15px;
        overflow-x: auto;
        padding-bottom: 5px;
    }
    .culture-grid {
        grid-template-columns: 1fr;
    }
    .culture-img {
        height: 200px;
    }
    .carousel-item {
        flex: 0 0 50%; /* 一行2个 */
    }
    .carousel-btn {
        width: 30px;
        height: 30px;
        font-size: 16px;
    }
    .carousel-prev {
        left: 0;
    }
    .carousel-next {
        right: 0;
    }
}

@media (max-width: 576px) {
    .top-nav .container {
        flex-direction: column;
        gap: 10px;
    }
    .main-menu {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .intro-img {
        height: 150px;
    }
    .carousel-item {
        flex: 0 0 100%; /* 一行1个 */
    }
    .footer .container {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 1400px){
    .container{
        width: 94%;
        margin-left: 3%;
    }
}