.banner-wrap {
    background: url('/frontend/web/image/product/carbon-manage/banner.png') no-repeat center;
    background-size: cover;
}

.banner-wrap .banner>h1 {
    text-align: left;
    color: rgba(47, 45, 45, 1);
    font-size: 32px;
    line-height: 1.4;
    font-weight: bold;
    margin-bottom: 20px;
}

.banner-wrap .banner>h3 {
    text-align: left;
    color: rgba(137, 142, 156, 1);
    font-size: 16px;
    line-height: 1.8;
}

.section-title {
    text-align: center;
    font-size: 40px;
    color: #262626;
    margin-bottom: 80px;
}

.tongdian .desc h2 {
    margin-top: 0;
}

.tongdian {
    padding-top: 100px;
    padding-bottom: 60px;
}

.tongdian .desc .dditem {
    width: 450px;
    box-sizing: border-box;
    margin-bottom: 20px;
    padding: 25px 40px;
    border-radius: 8px;
    cursor: pointer;
    background: #fff;
    transition: all 0.3s;
}

.tongdian .desc .dditem.active {
    box-shadow: 0px 0px 20px 5px rgba(0, 0, 0, 0.08);
}

.tongdian .desc .dditem h4 {
    margin-bottom: 10px;
}

.tongdian .desc .dditem h4 span:first-child {
    display: inline-block;
    margin-right: 16px;
    width: 30px;
    height: 30px;
    text-align: center;
    font-size: 16px;
    line-height: 30px;
    color: #262626;
    border: 1px solid #262626;
    border-radius: 15px;
    float: left;
}

.tongdian .desc .dditem.active h4 span:first-child {
    color: #fff;
    border: none;
    background: url('/frontend/web/image/product/index/num_ac_bg.png') no-repeat top left;
}

.tongdian .desc .dditem.active p {
    display: block;
    margin-left: 46px;
    margin-top: 10px;
}

.tongdian .desc .dditem p {
    display: none;
    font-size: 14px;
    color: #8c8c8c;
    line-height: 1.6;
}

.tongdian .r-img {
    padding-right: 50px;
    float: right;
    margin-top: -30px;
}

.tongdian .desc {
    float: left;
    width: 480px;
}

.tongdian .r-img img {
    max-width: 100%;
}


/* part2 左邻碳管理 */
.part2-carbon {
    padding: 100px 0 80px;
}

.part2-main-title {
    text-align: center;
    font-size: 40px;
    color: #262626;
    margin-bottom: 24px;
}

.part2-subtitle {
    text-align: center;
    font-size: 16px;
    color: #8c8c8c;
    margin-bottom: 60px;
    line-height: 1.8;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.part2-carbon .dashboard-img {
    text-align: center;
}

.part2-carbon .dashboard-img img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}


/* part3 碳管理技术支撑 */
.part3-tech {
    padding: 100px 0;
    width: 100%;
    background: #fff;
}

.part3-tech .section-title {
    margin-bottom: 60px;
}

.tech-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    box-sizing: border-box;
}

.tech-left {
    flex: 1;
    min-width: 0;
}

.tech-item {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 40px;
}

.tech-item:last-child {
    margin-bottom: 0;
}

.tech-icon {
    width: 12px;
    height: 12px;
    background: #33AAFF;
    border-radius: 50%;
    margin-top: 8px;
    flex-shrink: 0;
}

.tech-content h4 {
    font-size: 20px;
    color: #262626;
    margin-bottom: 12px;
}

.tech-content p {
    font-size: 14px;
    color: #595959;
    letter-spacing: 2px;
    line-height: 1.7;
}

.tech-right {
    flex: 0 0 auto;
    margin-left: 60px;
}

.tech-right img {
    max-width: 520px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}


/* part4 核心架构 */
.part4-values {
    padding: 80px 0 120px;
    background: #fff;
}

.part4-main-title {
    text-align: center;
    font-size: 40px;
    color: #262626;
    margin-bottom: 80px;
}

.values-grid {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.value-item {
    flex: 1;
    background: #fff;
    border-radius: 12px;
    padding: 0 0 40px;
    text-align: center;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    transition: all 0.3s;
    overflow: visible;
}

.value-item:hover {
    box-shadow: 0 12px 36px rgba(51, 170, 255, 0.12);
    transform: translateY(-5px);
}

.value-icon-wrap {
    border-radius: 12px 12px 0 0;
    padding: 48px 24px 60px;
    margin-bottom: -24px;
    overflow: visible;
    position: relative;
}

.value-icon-wrap img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    transform: scale(1.15);
    position: relative;
    z-index: 1;
}

.value-item h4 {
    font-size: 20px;
    color: #262626;
    margin-bottom: 16px;
    padding: 0 16px;
}

.value-item p {
    font-size: 14px;
    color: #8c8c8c;
    line-height: 1.6;
    padding: 0 16px;
}


/* CTA */
.part-cta {
    padding: 120px 0;
    text-align: center;
    background: #fff;
}

.cta-text {
    font-size: 18px;
    color: #8c8c8c;
    margin-bottom: 30px;
}

.cta-btn {
    display: inline-block;
    background: #33AAFF;
    color: #fff;
    font-size: 18px;
    padding: 15px 50px;
    border-radius: 30px;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(51, 170, 255, 0.35);
    transition: all 0.3s;
}

.cta-btn:hover {
    background: #2a99e6;
    transform: translateY(-2px);
}

.cross-bg {
    background: linear-gradient(180deg, #F5FBFF 0%, rgba(255, 255, 255, 0.35) 132%);
}