/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

html {
    font-size: 16px;
}

body {
    line-height: 1.6;
    color: #000;
}

/* 通用容器样式（90%宽度，居中） */
.slogan__container,
.excellence-digital__container,
.industrial-guarantee__container,
.sustainable-energy__container,
.sustainable-supply__container {
    width: 90%;
    margin: 0 auto;
    max-width: 1600px;
}

/* 1. Banner_video 样式 */
.banner-video {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.banner-video__player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-video__content {
    position: absolute;
    bottom: 25rem;
    left: 12rem;
    z-index: 2;
    color: #fff;
}

.banner-video__title {
    font-size: 80px;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.banner-video__desc {
    font-size: 16px;
    margin-bottom: 2rem;
    max-width: 800px;
}

.banner-video__buttons {
    display: flex;
    gap: 1.5rem;
}

.banner-video__btn {
    padding: 0.8rem 1.5rem;
    border-radius: 3px;
    border: none;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.banner-video__btn--green {
    background-color: #ADFD99;
    color: #fff;
}

.banner-video__btn--green a{
    /*background-color: #ADFD99;*/
    color: #fff;
}

.banner-video__btn--white {
    background-color: #fff;
    color: #000;
}

.banner-video__btn--white a{
    /*background-color: #fff;*/
    color: #000;
    text-decoration: none;
}

/* 2. 标语部分样式 */
.slogan {
    padding: 8rem 0;
}

.slogan__container {
    display: flex;
    justify-content: space-between;
    gap: 4rem;
}

.slogan__left {
    flex: 1;
}

.slogan__icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.slogan__title {
    font-size: 60px;
    color: #000;
    line-height: 1.3;
}

.slogan__right {
    flex: 1;
    display: flex;
    align-items: center;
}

.slogan__desc {
    font-size: 14px;
    color: #000;
}

/* 3. 案例部分样式 */
.cases {
    padding: 8rem 0;
}

.cases__tab-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.cases__tab-btn {
    padding: 0.8rem 1.5rem;
    border-radius: 3px;
    font-size: 16px;
    cursor: pointer;
    background: transparent;
    border: 1px solid #072929;
    color: #072929;
    transition: all 0.3s ease;
}

.cases__tab-btn.active {
    background-color: #072929;
    color: #fff;
    border-color: #072929;
}

.cases__tab-contents {
    width: 90%;
    margin: 0 auto;
}

.cases__tab-content {
    display: none;
    background-color: #072929;
    border-radius: 3px;
    padding: 3rem;
    color: #fff;
    justify-content: space-between;
    gap: 4rem;
    align-items: center;
}

.cases__tab-content.active {
    display: flex;
}

.cases__content-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.cases__icon {
    font-size: 2rem;
}

.cases__sub-title {
    font-size: 16px;
    opacity: 0.8;
}

.cases__main-title {
    font-size: 30px;
    color: #fff;
    line-height: 1.3;
}

.cases__desc {
    font-size: 14px;
    line-height: 1.6;
}

.cases__btn {
    padding: 1rem 1.5rem;
    border-radius: 3px;
    border: none;
    background-color: #ADFD99;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    width: fit-content;
    margin-top: 1rem;
}

.cases__content-right {
    flex: 1;
}

.cases__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 3px;
}

/* 4. 卓越数字部分样式 */
.excellence-digital {
    padding: 8rem 0;
}

.excellence-digital__top {
    margin-bottom: 6rem;
}

.excellence-digital__bottom {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    width: 90%;
    margin: 0 auto;
    flex-wrap: wrap;
}

.excellence-digital__col {
    flex: 1;
    min-width: 280px;
}

.excellence-digital__big-text {
    font-size: 40px;
    margin-bottom: 1rem;
    color: #000;
}

.excellence-digital__small-text {
    font-size: 14px;
    color: #000;
}

/* 5. 工业性能保证部分样式 */
.industrial-guarantee {
    padding: 8rem 0;
}

.industrial-guarantee__container {
    display: flex;
    justify-content: space-between;
    gap: 4rem;
    flex-wrap: wrap;
}

.industrial-guarantee__col {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.industrial-guarantee__title {
    font-size: 24px;
    color: #000;
}

.industrial-guarantee__desc {
    font-size: 14px;
    color: #000;
}

.industrial-guarantee__img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 3px;
}

/* 6. 可持续未来的高效能源部分样式 */
.sustainable-energy {
    padding: 8rem 0;
    background-color: #fff;
}

.sustainable-energy__container {
    background-color: #072929;
    border-radius: 3px;
    padding: 4rem;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    text-align: center;
}

.sustainable-energy__title {
    font-size: 40px;
    color: #fff;
}

.sustainable-energy__desc {
    font-size: 16px;
    max-width: 1000px;
    line-height: 1.6;
}

.sustainable-energy__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 3px;
}

/* 7. 使用场景部分样式 */
.usage-scenarios {
    padding: 8rem 0;
}

.usage-scenarios__header {
    margin-bottom: 4rem;
    padding: 0 5%;
}

.usage-scenarios__icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.usage-scenarios__sub-title {
    font-size: 16px;
    color: #1C1F22;
    margin-bottom: 1rem;
}

.usage-scenarios__title {
    font-size: 40px;
    color: #1C1F22;
}

.usage-scenarios__wrapper {
    width: 90%;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.usage-scenarios__content {
    display: flex;
    gap: 3rem;
    transition: transform 0.5s ease;
}

.usage-scenarios__col {
    flex: 0 0 calc(33.333% - 2rem);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.usage-scenarios__img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 3px;
}

.usage-scenarios__col-title {
    font-size: 20px;
    color: #1C1F22;
}

.usage-scenarios__col-desc {
    font-size: 14px;
    color: #1C1F22;
}

.usage-scenarios__controls {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.usage-scenarios__btn {
    width: 40px;
    height: 40px;
    border-radius: 3px;
    border: none;
    background-color: #072929;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 8. 最新消息部分样式 */
.latest-news {
    padding: 8rem 0;
}

.latest-news__header {
    margin-bottom: 4rem;
    padding: 0 5%;
}

.latest-news__title {
    font-size: 40px;
    color: #1C1F22;
}

.latest-news__content {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    width: 90%;
    margin: 0 auto;
    flex-wrap: wrap;
}

.latest-news__col {
    flex: 1;
    min-width: 280px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.latest-news__img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 3px;
}

.latest-news__date {
    font-size: 16px;
    color: #666;
}

.latest-news__col-title {
    font-size: 20px;
    color: #1C1F22;
}

.latest-news__tags {
    display: flex;
    gap: 0.8rem;
}

.latest-news__tag {
    padding: 0.3rem 0.8rem;
    border-radius: 3px;
    background-color: #D7EDDC;
    color: #072929;
    font-size: 12px;
}

/* 9. 可持续供应链部分样式 */
.sustainable-supply {
    padding: 8rem 0;
    background-color: #f5f5f5;
}

.sustainable-supply__container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.sustainable-supply__title {
    font-size: 40px;
    color: #000;
    line-height: 1.3;
}

.sustainable-supply__desc {
    font-size: 16px;
    color: #000;
    max-width: 1000px;
}

/* 11. SIAD集团介绍 & 12. 延伸部分样式 */
.siad-intro {
    padding: 8rem 0;
    display: flex;
    justify-content: space-between;
    gap: 4rem;
    width: 90%;
    margin: 0 auto;
    align-items: center;
}

.siad-intro__left {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.siad-intro__icon {
    font-size: 2rem;
}

.siad-intro__sub-title {
    font-size: 16px;
}

.siad-intro__main-title {
    font-size: 30px;
    color: #000;
}

.siad-intro__desc {
    font-size: 14px;
    color: #000;
}

.siad-intro__right {
    flex: 1;
}

.siad-intro__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 3px;
}

/* 13. 人才招聘部分样式 */
.talent-recruitment {
    padding: 8rem 0;
    display: flex;
    justify-content: space-between;
    gap: 4rem;
    width: 90%;
    margin: 0 auto;
    align-items: center;
}

.talent-recruitment__left {
    flex: 2;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.talent-recruitment__title {
    font-size: 24px;
    color: #000;
}

.talent-recruitment__desc {
    font-size: 14px;
    color: #000;
}

.talent-recruitment__main-title {
    font-size: 30px;
    color: #000;
}

.talent-recruitment__btn {
    padding: 1rem 1.5rem;
    border-radius: 3px;
    border: none;
    background-color: #43B05E;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    width: fit-content;
    margin-top: 1rem;
}

.talent-recruitment__right {
    flex: 1;
    display: flex;
    justify-content: center;
}

.talent-recruitment__circle {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
}

.talent-recruitment__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 响应式布局 - 平板设备（768px - 1024px） */
@media (max-width: 1024px) {
    .banner-video__title {
        font-size: 48px;
    }

    .slogan__title {
        font-size: 48px;
    }

    .slogan__container {
        flex-direction: column;
        gap: 2rem;
    }

    .cases__tab-content {
        flex-direction: column;
    }

    .siad-intro,
    .talent-recruitment {
        flex-direction: column;
    }

    .usage-scenarios__col {
        flex: 0 0 calc(50% - 1.5rem);
    }
}

/* 响应式布局 - 手机设备（小于768px） */
@media (max-width: 768px) {
    .banner-video {
        height: 80vh;
    }

    .banner-video__title {
        font-size: 36px;
    }

    .banner-video__content {
        left: 1rem;
        bottom: 2rem;
    }

    .slogan__title {
        font-size: 36px;
    }

    .excellence-digital__bottom {
        flex-direction: column;
        gap: 3rem;
    }

    .usage-scenarios__col {
        flex: 0 0 100%;
    }

    .latest-news__content {
        flex-direction: column;
    }

    .sustainable-energy__container {
        padding: 2rem;
    }

    .sustainable-energy__title {
        font-size: 30px;
    }

    .talent-recruitment__circle {
        width: 200px;
        height: 200px;
    }
}