/* 正文宽度 */
.about-intro,
.about-history,
.about-factory,
.about-rd,
.about-honors,
.about-why,
.about-global,
.about-partner {
    box-sizing: border-box;
    width: calc(100% - 64px);
    max-width: 1600px;
    margin: 0 auto;
    color: #333;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.75;
}

.about-intro *,
.about-history *,
.about-factory *,
.about-rd *,
.about-honors *,
.about-why *,
.about-global *,
.about-partner * {
    box-sizing: border-box;
}

.about-intro h2,
.about-history h2,
.about-factory h2,
.about-rd h2,
.about-honors h2,
.about-why h2,
.about-global h2,
.about-partner h2 {
    margin: 0 0 24px;
    padding: 0;
    color: #1d231f;
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
}

.about-copy p {
    margin: 0;
}

.about-copy p strong::before{
    display: inline-block;
    width: 6px;
    height: 6px;
    background: #444;
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: 2px;
    content: "";
}

.about-copy ul {
    margin: 26px 0 0;
    padding-left: 18px;
    list-style: disc;
}

.about-copy li {
    margin: 0;
    padding: 0;
    list-style: disc;
}

.about-copy strong {
    color: #444;
    font-weight: 700;
}

.about-copy img {
    max-width: 100%;
    height: auto;
}

/* 公司介绍 */
.about-intro {
    padding-top: 80px;
}

/* 发展历程 */
.about-history {
    margin-top: 58px;
}

.about-history h2 {
    text-align: center;
}

.about-timeline {
    display: flex;
    width: calc(100% - 200px);
    min-height: 620px;
    margin: 50px auto 0;
    padding: 0;
    list-style: none;
}

.about-timeline > li {
    position: relative;
    flex: 1;
    min-width: 0;
    height: 500px;
    margin: 0;
    padding: 0;
    list-style: none;
    cursor: pointer;
}

/* 时间轴横线 */
.about-timeline > li::after {
    content: "";
    position: absolute;
    top: 239px;
    left: 0;
    width: 100%;
    height: 1px;
    background: #e5e5e5;
}

.about-timeline > li:first-child::after {
    background: #a8e8bb;
}

.about-timeline > li:last-child::after {
    display: none;
}

.about-timeline-text {
    position: absolute;
    top: 8px;
    left: 0;
    width: 190px;
    max-width: 150%;
    padding-right: 16px;
}

.about-timeline > li:nth-child(even) .about-timeline-text {
    top: 278px;
}

.about-timeline-text h3 {
    margin: 0 0 10px;
    color: #00b83f;
    font-size: 24px;
    font-weight: 700;
    line-height: 30px;
}

.about-timeline-text div {
    color: #888;
    font-size: 14px;
    line-height: 1.5;
    height: calc(1.5em * 10);
    overflow: hidden;
}

.about-timeline-text p {
    margin: 0;
}

.about-timeline-dot {
    position: absolute;
    z-index: 1;
    top: 233px;
    left: 0;
    width: 13px;
    height: 13px;
    border: 1px solid #e5e5e5;
    border-radius: 50%;
    background: #fff;
    transition: all .3s;
}

.about-timeline > li:first-child .about-timeline-dot,
.about-timeline > li:hover .about-timeline-dot {
    border-color: #00b83f;
    background: #00b83f;
    box-shadow: 0 0 0 7px #e1f6e8, 0 0 0 13px #f1faf4;
}





/* 工厂、研发图片 */
.about-factory {
    margin-top: 20px;
}

.about-factory h2 {
    margin-bottom: 56px;
    text-align: center;
}

.about-photo-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-photo-list > li {
    min-width: 0;
    margin: 0;
    padding: 0;
    list-style: none;
    overflow: hidden;
}

.about-photo-list img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 380 / 310;
    object-fit: cover;
}

/* 研发实力 */
.about-rd {
    margin-top: 80px;
}

.about-rd .about-photo-list {
    margin-top: 70px;
}

.about-statistics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 60px 0 0;
    padding: 0;
    list-style: none;
}

.about-statistics > li {
    position: relative;
    min-width: 0;
    margin: 0;
    padding: 0 16px;
    list-style: none;
    text-align: center;
}

.about-statistics > li + li::before {
    content: "";
    position: absolute;
    top: 18px;
    left: 0;
    width: 1px;
    height: 62px;
    background: #f0f0f0;
}

.about-statistics > li > div {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    color: #242424;
    line-height: 1.2;
}

.about-statistics strong {
    font-family: "Arial Narrow", Arial, sans-serif;
    font-size: 56px;
    font-weight: 800;
    letter-spacing: -2px;
}

.about-statistics span {
    font-size: 20px;
    font-weight: 700;
}

.about-statistics p {
    margin: 8px 0 0;
    color: #999;
    font-size: 14px;
    line-height: 20px;
}

/* 证书 */
.about-honors {
    margin-top: 90px;
}

.about-honors h2 {
    margin-bottom: 16px;
}

.about-certificate-list {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
    margin: 42px 0 0;
    padding: 0;
    list-style: none;
}

.about-certificate-list > li {
    min-width: 0;
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-certificate-list a {
    display: block;
    padding: 8px;
    border: 1px solid #f0f0f0;
    background: #fff;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.035);
}

.about-certificate-list img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 240 / 340;
    object-fit: contain;
}

/* 公司优势 */
.about-why {
    margin-top: 76px;
}

.about-why .about-copy ul {
    margin-top: 0;
}

/* 合作品牌 */
.about-global {
    margin-top: 70px;
}

.about-brand-list {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 35px;
    align-items: center;
    margin: 44px 0 0;
    padding: 0;
    list-style: none;
}

.about-brand-list > li {
    min-width: 0;
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-brand-list img {
    display: block;
    width: 100%;
    height: 90px;
    object-fit: contain;
}

/* 地图使用完整原图，保留标记位置 */
.about-map-list {
    width: 82%;
    margin: 90px auto 0;
    padding: 0;
    list-style: none;
}

.about-map-list > li {
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-map-list img {
    display: block;
    width: 100%;
    height: auto;
}

/* 合作留言 */
.about-partner {
    margin-top: 70px;
    padding-bottom: 64px;
    text-align: center;
}

.about-partner h2 {
    margin-bottom: 14px;
}

.about-partner-intro {
    margin: 0;
    font-size: 16px;
    line-height: 26px;
}

.about-partner .about-form {
    width: 100%;
    max-width: 1152px;
    margin: 40px auto 0;
    padding: 0;
    text-align: left;
}

.about-form-row {
    display: grid;
    gap: 20px;
    margin-bottom: 20px;
}

.about-form-three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.about-form-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.about-form .form-input {
    position: relative;
    min-width: 0;
    margin: 0;
    padding: 0;
}

.about-form .form-control {
    display: block;
    width: 100%;
    max-width: none;
    height: 58px;
    margin: 0;
    padding: 0 20px;
    border: 1px solid #ddd;
    border-radius: 0;
    outline: none;
    background: #fff;
    color: #333;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px;
    box-shadow: none;
    appearance: none;
}

.about-form .form-control:focus {
    border-color: #666;
    box-shadow: none;
}

.about-form .form-control::placeholder {
    color: #999;
    opacity: 1;
}

.about-form textarea.form-control {
    height: 150px;
    min-height: 150px;
    padding: 18px 20px;
    line-height: 22px;
    resize: vertical;
}

.about-form .form-input > label {
    position: absolute;
    top: 29px;
    left: 20px;
    margin: 0;
    transform: translateY(-50%);
    color: #999;
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
    pointer-events: none;
}

.about-form label em {
    color: #ed4545;
    font-style: normal;
}

.about-form input:focus + label,
.about-form input:not(:placeholder-shown) + label {
    visibility: hidden;
}

/* 项目原有验证码 */
.about-verification {
    min-width: 0;
}

.about-verification > .col-md-12 {
    float: none;
    width: 100%;
    max-width: none;
    margin: 0 !important;
    padding: 0 !important;
}

.about-verification .captcha .form-control {
    padding-right: 140px;
}

.about-verification .captcha img {
    position: absolute;
    top: 10px;
    right: 8px;
    bottom: auto;
    left: auto;
    display: block;
    width: 118px;
    height: 38px;
    margin: 0;
    object-fit: contain;
    transform: none;
}

.about-form .invalid-feedback {
    display: none;
    margin-top: 6px;
    color: #d93025;
    font-size: 13px;
    line-height: 20px;
}

.about-form.was-validated .form-control:invalid {
    border-color: #d93025;
}

.about-form.was-validated .form-control:invalid ~ .invalid-feedback {
    display: block;
}

.about-submit-wrap {
    margin-top: 46px;
    text-align: center;
}

.about-form .about-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 242px;
    min-height: 58px;
    padding: 15px 24px;
    border: 0;
    border-radius: 2px;
    background: #151515!important;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    box-shadow: none;
    cursor: pointer;
}

.about-form .about-submit:hover {
    background: #00b83f!important;
    color: #fff;
}

.about-form .about-submit:focus-visible,
.about-certificate-list a:focus-visible,
.about-partner-email a:focus-visible {
    outline: 2px solid #00b83f;
    outline-offset: 4px;
}

.about-partner-email {
    margin: 48px 0 0;
    font-size: 16px;
    font-style: italic;
}

.about-partner-email a {
    display: inline-block;
    margin-left: 4px;
    color: #00b83f;
    text-decoration: underline;
    overflow-wrap: anywhere;
}

.about-form-success,
.about-form-error {
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 22px;
}

.about-form-success {
    color: #218838;
}

.about-form-error {
    color: #d93025;
}

.about-form-error p {
    margin: 0 0 5px;
}

/* 中等桌面 */
@media (max-width: 1399px) {
    .about-timeline {
        width: calc(100% - 80px);
    }

    .about-timeline-text {
        width: 150px;
        padding-right: 12px;
    }

    .about-statistics strong {
        font-size: 44px;
    }

    .about-brand-list {
        gap: 24px;
    }
}

/* 平板 */
@media (max-width: 991px) {
    .about-intro h2,
    .about-history h2,
    .about-factory h2,
    .about-rd h2,
    .about-honors h2,
    .about-why h2,
    .about-global h2,
    .about-partner h2 {
        font-size: 28px;
    }

    .about-intro {
        padding-top: 48px;
    }

    .about-history,
    .about-rd,
    .about-honors,
    .about-why,
    .about-global,
    .about-partner {
        margin-top: 48px;
    }

    /* 时间轴改为竖向 */
    .about-timeline {
        display: block;
        width: 100%;
        min-height: 0;
        margin-top: 36px;
        padding-left: 12px;
    }

    .about-timeline > li {
        height: auto;
        min-height: 96px;
        padding: 0 0 28px 34px;
    }

    .about-timeline > li::after {
        top: 12px;
        left: 0;
        width: 1px;
        height: 100%;
    }

    .about-timeline-text,
    .about-timeline > li:nth-child(even) .about-timeline-text {
        position: static;
        width: 100%;
        max-width: none;
        padding: 0;
    }

    .about-timeline-dot {
        top: 8px;
        left: -6px;
    }

    .about-timeline-text h3 {
        margin-bottom: 6px;
        font-size: 22px;
    }

    .about-timeline-text div {
        font-size: 15px;
        line-height: 22px;
        height: auto;
    }

    .about-factory h2 {
        margin-bottom: 30px;
    }

    .about-photo-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 20px;
    }

    .about-rd .about-photo-list {
        margin-top: 36px;
    }

    .about-statistics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 30px 0;
        margin-top: 36px;
    }

    .about-statistics > li:nth-child(3)::before {
        display: none;
    }

    .about-certificate-list {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 20px;
        margin-top: 28px;
    }

    .about-brand-list {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 20px 30px;
        margin-top: 28px;
    }

    .about-map-list {
        width: 100%;
        margin-top: 48px;
    }

    .about-partner-intro br {
        display: none;
    }
}

/* 手机 */
@media (max-width: 600px) {
    .about-intro,
    .about-history,
    .about-factory,
    .about-rd,
    .about-honors,
    .about-why,
    .about-global,
    .about-partner {
        width: calc(100% - 40px);
        font-size: 14px;
        line-height: 1.75;
    }

    .about-intro h2,
    .about-history h2,
    .about-factory h2,
    .about-rd h2,
    .about-honors h2,
    .about-why h2,
    .about-global h2,
    .about-partner h2 {
        margin-bottom: 18px;
        font-size: 24px;
    }

    .about-intro {
        padding-top: 36px;
    }

    .about-history,
    .about-rd,
    .about-honors,
    .about-why,
    .about-global,
    .about-partner {
        margin-top: 36px;
    }

    .about-copy ul {
        margin-top: 18px;
    }

    .about-photo-list {
        gap: 12px;
    }

    .about-statistics strong {
        font-size: 34px;
        letter-spacing: -1px;
    }

    .about-statistics span {
        font-size: 14px;
    }

    .about-statistics p {
        font-size: 12px;
        line-height: 18px;
    }

    .about-statistics > li {
        padding: 0 8px;
    }

    .about-statistics > li + li::before {
        top: 8px;
        height: 48px;
    }

    .about-certificate-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }

    .about-brand-list {
        gap: 12px 16px;
    }

    .about-brand-list img {
        height: 58px;
    }

    .about-map-list {
        margin-top: 32px;
    }

    .about-partner {
        padding-bottom: 40px;
    }

    .about-partner-intro {
        font-size: 14px;
        line-height: 22px;
    }

    .about-partner .about-form {
        margin-top: 28px;
    }

    .about-form-three,
    .about-form-two {
        grid-template-columns: 1fr;
    }

    .about-form-row {
        gap: 14px;
        margin-bottom: 14px;
    }

    .about-form .form-control {
        height: 54px;
        font-size: 16px;
    }

    .about-form .form-input > label {
        top: 27px;
    }

    .about-verification .captcha img {
        top: 8px;
    }

    .about-submit-wrap {
        margin-top: 26px;
    }

    .about-form .about-submit {
        width: 100%;
        min-height: 54px;
    }

    .about-partner-email {
        margin-top: 28px;
        font-size: 13px;
        line-height: 22px;
    }
}


/* 三个轮播容器 */
.about-factory-swiper,
.about-rd-swiper,
.about-honors-swiper {
    position: relative;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding: 0;
    overflow: hidden;
}

/* 保留原设计间距 */
.about-rd-swiper {
    margin-top: 70px;
}

.about-honors-swiper {
    margin-top: 42px;
}

/* 清除原列表样式，间距由 Swiper 控制 */
.about-factory-swiper > .swiper-wrapper,
.about-rd-swiper > .swiper-wrapper,
.about-honors-swiper > .swiper-wrapper {
    display: flex;
    gap: 0;
    width: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-factory-swiper > .swiper-wrapper::before,
.about-factory-swiper > .swiper-wrapper::after,
.about-rd-swiper > .swiper-wrapper::before,
.about-rd-swiper > .swiper-wrapper::after,
.about-honors-swiper > .swiper-wrapper::before,
.about-honors-swiper > .swiper-wrapper::after {
    display: none;
}

.about-factory-swiper .swiper-slide,
.about-rd-swiper .swiper-slide,
.about-honors-swiper .swiper-slide {
    position: relative;
    flex-shrink: 0;
    float: none;
    min-width: 0;
    height: auto;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    list-style: none;
    box-sizing: border-box;
}

.about-factory-swiper .swiper-slide::before,
.about-factory-swiper .swiper-slide::after,
.about-rd-swiper .swiper-slide::before,
.about-rd-swiper .swiper-slide::after,
.about-honors-swiper .swiper-slide::before,
.about-honors-swiper .swiper-slide::after {
    display: none;
}

/* 工厂、研发图片 */
.about-factory-swiper .swiper-slide img,
.about-rd-swiper .swiper-slide img {
    position: static;
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    aspect-ratio: 380 / 310;
    margin: 0;
    padding: 0;
    border: 0;
    object-fit: cover;
    transform: none;
}

/* 证书 */
.about-honors-swiper .swiper-slide a {
    display: block;
    width: 100%;
    padding: 8px;
    border: 1px solid #ededed;
    border-radius: 3px;
    background: #fff;
    box-sizing: border-box;
}

.about-honors-swiper .swiper-slide img {
    position: static;
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    aspect-ratio: 240 / 340;
    margin: 0;
    padding: 0;
    border: 0;
    object-fit: contain;
    transform: none;
}

.about-honors-swiper a:focus-visible {
    outline: 2px solid #00b83f;
    outline-offset: -3px;
}

@media (max-width: 991px) {
    .about-rd-swiper {
        margin-top: 36px;
    }

    .about-honors-swiper {
        margin-top: 28px;
    }
}

@media (max-width: 600px) {
    .about-rd-swiper {
        margin-top: 28px;
    }

    .about-honors-swiper .swiper-slide a {
        padding: 5px;
    }
}



.about-brand-swiper {
    position: relative;
    width: 100%;
    min-width: 0;
    max-width: 100%;
    margin: 44px auto 0;
    padding: 0;
    overflow: hidden;
}

.about-brand-swiper > .swiper-wrapper {
    display: flex;
    align-items: center;
    gap: 0;
    width: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
}

.about-brand-swiper > .swiper-wrapper::before,
.about-brand-swiper > .swiper-wrapper::after,
.about-brand-swiper .swiper-slide::before,
.about-brand-swiper .swiper-slide::after {
    display: none;
}

.about-brand-swiper .swiper-slide {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    float: none;
    min-width: 0;
    height: 90px;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    list-style: none;
    box-sizing: border-box;
}

.about-brand-swiper .swiper-slide img {
    position: static;
    display: block;
    width: 100%;
    height: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    object-fit: contain;
    transform: none;
}

@media (max-width: 991px) {
    .about-brand-swiper {
        margin-top: 28px;
    }

    .about-brand-swiper .swiper-slide {
        height: 76px;
    }
}

@media (max-width: 600px) {
    .about-brand-swiper .swiper-slide {
        height: 58px;
    }
}



/* 箭头按钮 */
.about-factory-swiper .about-swiper-arrow,
.about-rd-swiper .about-swiper-arrow,
.about-honors-swiper .about-swiper-arrow {
    position: absolute;
    top: 50%;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 8px;
    background: rgba(20, 24, 23, 0.65);
    color: #fff;
    transform: translateY(-50%);
    cursor: pointer;
    transition: background-color 0.2s, opacity 0.2s;
}

.about-swiper-arrow.swiper-button-prev {
    left: 24px;
    right: auto;
}

.about-swiper-arrow.swiper-button-next {
    right: 24px;
    left: auto;
}

/* 使用 Swiper 自带箭头字体 */
.about-swiper-arrow.swiper-button-prev::after,
.about-swiper-arrow.swiper-button-next::after {
    font-size: 16px;
    font-weight: 700;
}

.about-swiper-arrow:hover {
    background: #141817;
}

.about-swiper-arrow:focus-visible {
    outline: 2px solid #00b83f;
    outline-offset: 3px;
}

/* 到达起点或终点 */
.about-swiper-arrow.swiper-button-disabled {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
}

/* 图片不足以滚动时隐藏箭头 */
.about-swiper-arrow.swiper-button-lock {
    display: none;
}

@media (max-width: 600px) {
    .about-factory-swiper .about-swiper-arrow,
    .about-rd-swiper .about-swiper-arrow,
    .about-honors-swiper .about-swiper-arrow {
        width: 36px;
        height: 36px;
        border-radius: 6px;
    }

    .about-swiper-arrow.swiper-button-prev {
        left: 10px;
    }

    .about-swiper-arrow.swiper-button-next {
        right: 10px;
    }

    .about-swiper-arrow.swiper-button-prev::after,
    .about-swiper-arrow.swiper-button-next::after {
        font-size: 14px;
    }
}



/* 默认隐藏：左箭头向左偏移 */
.about-factory-swiper .about-swiper-prev,
.about-rd-swiper .about-swiper-prev,
.about-honors-swiper .about-swiper-prev {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-70px, -50%);
    transition:
        transform 0.3s ease,
        opacity 0.3s ease,
        visibility 0.3s ease,
        background-color 0.2s ease;
}

/* 默认隐藏：右箭头向右偏移 */
.about-factory-swiper .about-swiper-next,
.about-rd-swiper .about-swiper-next,
.about-honors-swiper .about-swiper-next {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(70px, -50%);
    transition:
        transform 0.3s ease,
        opacity 0.3s ease,
        visibility 0.3s ease,
        background-color 0.2s ease;
}

/* 鼠标移入轮播区域，箭头滑入 */
.about-factory-swiper:hover .about-swiper-arrow,
.about-rd-swiper:hover .about-swiper-arrow,
.about-honors-swiper:hover .about-swiper-arrow {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate(0, -50%);
}

/* 起点、终点的禁用箭头 */
.about-factory-swiper:hover .about-swiper-arrow.swiper-button-disabled,
.about-rd-swiper:hover .about-swiper-arrow.swiper-button-disabled,
.about-honors-swiper:hover .about-swiper-arrow.swiper-button-disabled {
    opacity: 0.35;
    pointer-events: none;
}

/* 图片不足以滚动时不显示 */
.about-factory-swiper .about-swiper-arrow.swiper-button-lock,
.about-rd-swiper .about-swiper-arrow.swiper-button-lock,
.about-honors-swiper .about-swiper-arrow.swiper-button-lock {
    display: none;
}



/* 桌面时间轴 */
@media (min-width: 992px) {
    /* 恢复最后一个节点右侧的延长线 */
    .about-timeline > li:last-child::after {
        display: block;
        width: 80%;
    }

    /* 第一段底线仍为灰色 */
    .about-timeline > li:first-child::after {
        background: #e5e5e5;
    }

    /* 单独绘制较短的绿色线段 */
    .about-timeline > li:first-child::before {
        content: "";
        position: absolute;
        top: 139px;
        left: 0;
        z-index: 1;
        width: 64%;
        height: 1px;
        background: #00b83f;
        display: none;
    }

    /* 描述文字稍微放宽，减少不必要的换行 */
    .about-timeline-text {
        width: 220px;
        max-width: 150%;
        padding-right: 12px;
    }
}

/* 平板、手机保留竖向时间轴 */
@media (max-width: 991px) {
    .about-timeline > li:first-child::before {
        display: none;
    }

    .about-timeline > li:last-child::after {
        display: none;
    }
}