.steel_factory_timeline_8dK3a {
    position: relative;
    max-width: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
        url('http://img.bjyyb.net/custom/material/4_3_1.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;

    overflow-x: hidden;

    margin-top: var(--margin_tb);
    margin-bottom: var(--margin_tb);

    min-height: 75vh;
}

.timeline_container_8dK3a {
    display: grid;
    grid-template-columns: 1fr 2fr 120px;
    gap: 2rem;


    padding-left: var(--padding-lr);
    padding-right: var(--padding-lr);
    max-width: var(--custom-content-max-width);
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
    align-items: center;

}

/* 年份项容器 - 使用display: contents让子元素参与grid布局 */
.timeline_year_item_8dK3a {
    display: contents;
}

.timeline_image_section_8dK3a {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    /* box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3); */
    width: 100%;
    max-width: 100%;
}

.timeline_image_item_8dK3a {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.timeline_image_item_8dK3a.active {
    display: block;
    position: relative;
    opacity: 1;
}

.timeline_main_image_8dK3a {
    width: 100%;
}

.timeline_img_8dK3a {
    transition: transform 0.6s ease;
}

.custom_image_wrapper {
    aspect-ratio: var(--image_ratio, 1 / 1);
    border-radius: var(--image_shape, 0%);
    overflow: hidden;
    width: 100%;
    position: relative;
}

.custom_image {
    width: 100%;
    height: 100%;
    object-fit: var(--image_fit, cover);
    display: block;
}

.timeline_image_overlay_8dK3a {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* background: linear-gradient(45deg, rgba(255, 107, 53, 0.2), rgba(0, 0, 0, 0.3)); */
    opacity: 0;
    transition: opacity 0.3s ease;
}

.timeline_image_section_8dK3a:hover .timeline_image_overlay_8dK3a {
    opacity: 1;
}

.timeline_image_section_8dK3a:hover .timeline_img_8dK3a {
    transform: scale(1.05);
}

.timeline_content_section_8dK3a {
    padding: 2rem;
    border-radius: 16px;

    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    position: relative;
    overflow: hidden;
}

.timeline_content_item_8dK3a {
    display: none;
    opacity: 0;
    transition: opacity 0.4s ease;
    height: 100%;

}

.timeline_content_item_8dK3a.active {
    display: flex;
    flex-direction: column;
    opacity: 1;
    height: auto;
}

.timeline_story_label_8dK3a {
    color: var(--theme-color_8dK3a);
    font-size: var(--card-title-size_8dK3a, 1.9rem);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.timeline_title_8dK3a {
    font-size: var(--title-size_8dK3a, 3.5rem);
    font-weight: 700;
    color: var(--title-color_8dK3a, #ffffff);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.timeline_subtitle_8dK3a {
    font-size: var(--subtitle-size_8dK3a, 2.2rem);
    color: var(--subtitle-color_8dK3a, #ffffff);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.timeline_description_8dK3a {
    font-size: var(--description-size_8dK3a, 1.6rem);
    color: var(--description-color_8dK3a, #cccccc);
    line-height: 1.6;
    margin-bottom: 6rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 5;
    text-overflow: ellipsis;
}

.timeline_button_8dK3a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--theme-color_8dK3a);
    color: #ffffff;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: var(--button-size_8dK3a, 1.6rem);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    align-self: flex-start;
    flex-shrink: 0;
    margin-top: auto;
}

.timeline_button_8dK3a:hover {
    background: var(--theme-color_8dK3a);
    transform: translateY(-2px);
}

.timeline_nav_wrapper_8dK3a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.timeline_nav_arrow_8dK3a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--timeline-bg_8dK3a);
    border: 2px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color-secondary_8dK3a);
    flex-shrink: 0;
}

.timeline_nav_arrow_8dK3a:hover {
    background: var(--theme-color_8dK3a);
    border-color: var(--theme-color_8dK3a);
    color: #ffffff;
    transform: scale(1.1);
    box-shadow: 0 0 15px var(--theme-shadow-color_8dK3a, rgba(255, 107, 53, 0.5));
}

.timeline_nav_arrow_8dK3a.disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.timeline_nav_arrow_8dK3a::before {
    content: '';
    display: block;
    width: 17px;
    height: 17px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    mask-size: contain;
    mask-repeat: no-repeat;
    mask-position: center;
    -webkit-mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-position: center;
}

.timeline_arrow_up_8dK3a::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 16L12 4L18 16' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 16L12 4L18 16' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 16L12 4L18 16' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    background-color: #ffffff;
}

.timeline_arrow_down_8dK3a::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 8L12 20L18 8' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 8L12 20L18 8' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 8L12 20L18 8' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    background-color: #ffffff;
}

.timeline_nav_section_8dK3a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    max-height: 400px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 15px 0.5rem;
    position: relative;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE and Edge */
}

.timeline_nav_section_8dK3a::-webkit-scrollbar {
    display: none;
    /* Chrome, Safari, Opera */
}

.timeline_nav_item_8dK3a {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.timeline_year_circle_8dK3a {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--timeline-bg_8dK3a);
    border: 2px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;

    font-weight: 700;
    color: var(--text-color-secondary_8dK3a);
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.timeline_nav_item_8dK3a.active .timeline_year_circle_8dK3a {
    background: var(--theme-color_8dK3a);
    border-color: var(--theme-color_8dK3a);
    color: #ffffff;
    transform: scale(1.1);
    box-shadow: 0 0 0px rgba(255, 107, 53, 0.5);
}

.timeline_nav_item_8dK3a:hover .timeline_year_circle_8dK3a {
    transform: scale(1.05);
    border-color: var(--theme-color_8dK3a);
}

.timeline_connector_8dK3a {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 80px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    z-index: 1;
}

.timeline_nav_item_8dK3a:last-child .timeline_connector_8dK3a {
    display: none;
}

@media (max-width: 768px) {
    .timeline_container_8dK3a {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
    }

    .timeline_nav_wrapper_8dK3a {
        flex-direction: row !important;
        justify-content: center !important;
        width: 100% !important;
        max-width: 100% !important;
        gap: 0.5rem !important;
    }

    .timeline_container_8dK3a {
        display: block;
    }

    .timeline_nav_section_8dK3a {
        flex-direction: row !important;
        justify-content: flex-start !important;
        flex-wrap: nowrap !important;
        max-height: none !important;
        max-width: min(600px, calc(100vw - 140px)) !important;
        overflow-x: auto !important;
        overflow-y: hidden !important;
        padding: 15px 60px 15px 1rem !important;
        gap: 2rem !important;
    }
}

@media (max-width: 1024px) {




    .timeline_image_section_8dK3a {
        width: 100% !important;
        max-width: 100% !important;
        border-radius: 12px !important;
        overflow: hidden !important;
    }

    .timeline_main_image_8dK3a {}

    .timeline_content_section_8dK3a {}

    .timeline_story_label_8dK3a {

        margin-bottom: 0.3rem !important;
    }

    .timeline_title_8dK3a {

        margin-bottom: 0.8rem !important;
    }

    .timeline_subtitle_8dK3a {

        margin-bottom: 1rem !important;
    }

    .timeline_description_8dK3a {}

    .timeline_button_8dK3a {
        padding: 10px 20px !important;

    }

    .timeline_year_circle_8dK3a {}



    .timeline_nav_arrow_8dK3a {
        width: 36px !important;
        height: 36px !important;
    }

    .timeline_nav_arrow_8dK3a::before {
        width: 18px !important;
        height: 18px !important;
        transform: rotate(-90deg) !important;
    }

    .timeline_connector_8dK3a {
        width: 80px !important;
        height: 2px !important;
        top: 50% !important;
        left: 100% !important;
        transform: translateY(-50%) !important;
    }

    .timeline_nav_item_8dK3a:last-child .timeline_connector_8dK3a {
        display: none !important;
    }

    .timeline_nav_item_8dK3a {
        flex-shrink: 0 !important;
        min-width: 60px !important;
    }
}

@media (max-width: 768px) {
    .steel_factory_timeline_8dK3a {

        background-attachment: scroll !important;
    }

    .timeline_image_item_8dK3a.active {
        margin: 0 auto !important;

    }

    .timeline_container_8dK3a {
        gap: 2rem !important;

    }

    .timeline_image_section_8dK3a {

        overflow: hidden !important;
    }

    .timeline_main_image_8dK3a {}

    .timeline_content_section_8dK3a {}

    .timeline_story_label_8dK3a {

        margin-bottom: 1rem !important;
    }

    .timeline_title_8dK3a {
        margin-bottom: 1.5rem !important;
    }

    .timeline_subtitle_8dK3a {
        margin-bottom: 2rem !important;
    }

    .timeline_description_8dK3a {}

    .timeline_button_8dK3a {
        margin-top: 1.5rem !important;
    }

    .timeline_nav_section_8dK3a {
        max-width: calc(100vw - 120px) !important;
        padding: 15px 60px 15px 1rem !important;
    }
}

@media (max-width: 480px) {
    .steel_factory_timeline_8dK3a {}

    .timeline_image_item_8dK3a.active {
        margin: 0 auto !important;

    }

    .timeline_container_8dK3a {
        gap: 1.5rem !important;

    }

    .timeline_image_section_8dK3a {


        overflow: hidden !important;

    }

    .timeline_main_image_8dK3a {}

    .timeline_content_section_8dK3a {}

    .timeline_story_label_8dK3a {

        margin-bottom: 0.8rem !important;
    }

    .timeline_title_8dK3a {

        margin-bottom: 1.2rem !important;
    }

    .timeline_subtitle_8dK3a {
        margin-bottom: 1.5rem !important;
    }

    .timeline_description_8dK3a {}

    .timeline_button_8dK3a {
        padding: 8px 16px !important;

        margin-top: 1.2rem !important;
    }

    .timeline_year_circle_8dK3a {
        width: 45px !important;
        height: 45px !important;
    }

    .timeline_nav_arrow_8dK3a {
        width: 32px !important;
        height: 32px !important;
    }

    .timeline_nav_section_8dK3a {
        max-width: calc(100vw - 80px) !important;
        padding: 1rem !important;
        gap: 1rem !important;
    }

    .timeline_connector_8dK3a {
        width: 60px !important;
    }
}


/* 手机端样式 */
@media (max-width: 767px) {
    .timeline_story_label_8dK3a {
        font-size: calc(var(--card-title-size_8dK3a) *.9);
    }

    .timeline_title_8dK3a {
        font-size: calc(var(--title-size_8dK3a) *.9);
    }

    .timeline_subtitle_8dK3a {
        font-size: calc(var(--timeline_subtitle_8dK3a) *.9);
    }

    .timeline_description_8dK3a {
        font-size: calc(var(--description-size_8dK3a) *.9);
    }

    .timeline_button_8dK3a {
        font-size: calc(var(--button-size_8dK3a) *.9);
    }

    .steel_factory_timeline_8dK3a {}

    .timeline_container_8dK3a {
        padding: 4rem 2rem !important;
    }
}


/* 平板（Pad）样式，适用于平板设备的样式 */
@media (min-width: 768px) and (max-width: 1024px) {
    .timeline_story_label_8dK3a {
        font-size: calc(var(--card-title-size_8dK3a) *.95);
    }

    .timeline_title_8dK3a {
        font-size: calc(var(--title-size_8dK3a) *.95);
    }

    .timeline_subtitle_8dK3a {
        font-size: calc(var(--timeline_subtitle_8dK3a) *.95);
    }

    .timeline_description_8dK3a {
        font-size: calc(var(--description-size_8dK3a) *.95);
    }

    .timeline_button_8dK3a {
        font-size: calc(var(--button-size_8dK3a) *.95);
    }

}