.sub-banner .txtarea .tit {
    .title1 {
        background: linear-gradient(90deg, #2b96f5 -3%, #1366ec 19%, #7c6df9 46%);
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
        color: transparent;
    }
}

.c3d {
    color: #3d3d3d;
}

.ai4s-content {
    font-family: HarmonyOS Sans SC;
    font-size: 20px !important;
    font-weight: normal;
    line-height: 22px !important;
    letter-spacing: 0px;
}

/* 平台优势 - 四个优势卡片 */
.ai4s-advantages {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    margin-top: 45px;
}

.ai4s-adv-item {
    position: relative;
    flex: 1;
    border-radius: 16px;
    padding: 180px 26px 26px 26px;
    display: flex;
    flex-direction: column;
    align-items: center;

    background: #FFFFFF;

    /* AI4S投影1 */
    box-shadow: 0px 4px 30px 0px rgba(215, 227, 238, 0.7);
}

.ai4s-adv-svg {
    width: 100%;
    height: auto;
    display: block;
}

.ai4s-adv-icon {
    position: absolute;
    top: 35px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.ai4s-adv-desc {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.ai4s-adv-desc .title {
    margin: 0;
    font-size: 20px;
    font-weight: 500;
    line-height: 26px;
    letter-spacing: 0px;
    text-align: center;
    color: #3D3D3D;
}

.ai4s-adv-desc p {
    margin-top: 12px;
    font-size: 14px;
    font-weight: normal;
    line-height: 22px;
    letter-spacing: 0px;
    text-align: center;
    color: #A0A0A0;
    white-space: normal;
    word-break: normal;
    overflow-wrap: break-word;
}

.ai4s-adv-desc .break-here {
    display: inline-block;
    max-width: 100%;
}

.ai4s-architecture {
    width: 100%;
    border-radius: 20px;
}

/* banner 播放按钮 */
.ai4s-banner-play-btn {
    margin-top: 32px;
    cursor: pointer;
    display: inline-block;
}

.ai4s-banner-play-btn img {
    width: 158px;
    height: auto;
    display: block;
}

/* 案例视频 - 播放按钮覆盖层 */
.ai4s-video-wrap {
    position: relative;
    width: 100%;
    border-radius: 20px;
    overflow: hidden;
}

.ai4s-video-wrap .ai4s-architecture {
    display: block;
    border-radius: 20px;
}

.ai4s-video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.ai4s-video-play:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.ai4s-video-play img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.ai4s-video-wrap.playing .ai4s-video-play {
    display: none;
}

/* 应用场景 - 网格布局 */
.ai4s-scenarios {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 16px;
    row-gap: 24px;
    margin-top: 45px;
}

.ai4s-scen-card {
    display: flex;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0px 4px 30px 0px rgba(215, 227, 238, 0.7);
}

.ai4s-scen-left {
    flex: 1;
    padding: 49px 34px 29px 34px;
    display: flex;
    flex-direction: column;
}

.ai4s-scen-title {
    margin: 0 0 17px 0;
    font-family: HarmonyOS Sans SC;
    font-size: 22px;
    font-weight: 500;
    line-height: 26px;
    color: #3d3d3d;
}

.ai4s-scen-desc {
    flex: 1;
    min-height: 88px;
    max-height: 88px;
    margin: 0 0 40px 0;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    text-overflow: ellipsis;
    font-family: HarmonyOS Sans SC;
    font-size: 14px;
    font-weight: normal;
    line-height: 22px;
    letter-spacing: 0px;
    color: #a0a0a0;
    cursor: default;
}

.ai4s-scen-btns {
    display: flex;
    gap: 9px;
    min-height: 34px;
}

.ai4s-scen-dropdown {
    position: relative;
    padding-bottom: 8px;
    margin-bottom: -8px;
}

.ai4s-scen-btn {
    font-family: HarmonyOS Sans SC;
    display: inline-block;
    padding: 4px 25px;
    font-size: 14px;
    line-height: 22px;
    background: #FFFFFF;
    color: #3D3D3D;
    box-sizing: border-box;
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

@media screen and (max-width: 1445px) {
    .ai4s-scen-btn {
        padding: 4px 16px;
    }

}

.ai4s-scen-btn:hover {
    border: 1px solid transparent;
    border-radius: 4px;
    background:
        linear-gradient(#ffffff, #ffffff) padding-box,
        linear-gradient(250deg, #1366ece6 -1%, #7c6df9e6 101%) border-box;
    color: #1366ec;
}

.ai4s-scen-btn.primary {
    background: linear-gradient(75deg, #2b96f5 -20%, #1366ec 17%, #a095ff 107%, #ff8e18 107%);
    color: #fff;
}

.ai4s-scen-btn.disabled {
    color: #A0A0A0;
    cursor: not-allowed;
    border: 1px solid #ECECEE;
}

.ai4s-scen-menu {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    z-index: 20;
    min-width: 120px;
    padding: 8px 0;
    border-radius: 8px;
    background: #FFFFFF;
    box-shadow: 0px 8px 24px rgba(0, 0, 0, 0.12);
    display: none;
}

.ai4s-scen-menu a {
    display: block;
    padding: 8px 16px;
    font-size: 14px;
    line-height: 22px;
    color: #3D3D3D;
    white-space: nowrap;
}

.ai4s-scen-menu a:hover {
    background: #F6F8FC;
    color: #1366EC;
}

.ai4s-scen-dropdown:hover .ai4s-scen-menu {
    display: block;
}

.ai4s-scen-card:last-child .ai4s-scen-menu {
    top: auto;
    bottom: 100%;
}

.ai4s-scen-btn.primary:hover {
    background: linear-gradient(75deg, #2b96f5 -20%, #1366ec 17%, #a095ff 107%, #ff8e18 107%);
}

.ai4s-scen-right {
    padding: 16px;
    flex: 0 0 40%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ai4s-scen-right img {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
}

.ai4s-tooltip {
    position: absolute;
    z-index: 9999;
    display: none;
    max-width: 320px;
    padding: 12px 14px;
    border-radius: 8px;
    background: rgba(38, 38, 38, 0.92);
    color: #fff;
    font-size: 14px;
    line-height: 22px;
    white-space: normal;
    word-break: break-word;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    pointer-events: none;
}

.ai4s-eco-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    column-gap: 16px;
    row-gap: 24px;
    margin-top: 45px;
}

.ai4s-eco-card {
    min-height: 120px;
    border-radius: 12px;
    opacity: 1;
    background: #FFFFFF;
    box-shadow: 0px 4px 10px 0px rgba(215, 227, 238, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.ai4s-eco-card img {
    width: 70%;
    height: auto;
    display: block;
}

/* ===== 移动端适配 ===== */
@media only screen and (max-width: 450px) {
    .sub-banner .txtarea .tit {
        height: auto !important;
        white-space: nowrap;
        font-size: 28px !important;
        line-height: 36px !important;
        margin-top: 360px;
    }

    .sub-banner .txtarea .tit .title1 {
        white-space: nowrap;
    }

    .ai4s-content {
        font-size: 14px !important;
        line-height: 20px !important;
    }

    .ai4s-banner-play-btn {
        margin-top: 20px;
    }

    .ai4s-banner-play-btn img {
        width: 110px;
    }

    /* 平台优势 - 单列布局 */
    .ai4s-advantages {
        flex-direction: column;
        gap: 12px;
        margin-top: 24px;
    }

    .ai4s-adv-item {
        flex: unset;
        padding: 130px 20px 20px 20px;
        border-radius: 12px;
    }

    .ai4s-adv-icon {
        width: 100px;
        height: auto;
    }

    .ai4s-adv-desc .title {
        font-size: 16px;
    }

    .ai4s-adv-desc p {
        font-size: 13px;
        line-height: 20px;
        margin-top: 8px;
    }

    /* 平台架构 */
    .ai4s-architecture {
        border-radius: 12px;
    }

    /* 应用场景 - 单列布局 */
    .ai4s-scenarios {
        grid-template-columns: 1fr;
        column-gap: 0;
        row-gap: 16px;
        margin-top: 24px;
    }

    .ai4s-scen-card {
        flex-direction: column-reverse;
        border-radius: 12px;
    }

    .ai4s-scen-left {
        padding: 16px 20px 20px 20px;
    }

    .ai4s-scen-right {
        flex: unset;
        padding: 16px 16px 0 16px;
        height: 130px;
    }

    .ai4s-scen-right img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 8px;
    }

    .ai4s-scen-title {
        font-size: 18px;
        margin-bottom: 10px;
    }

    .ai4s-scen-desc {
        font-size: 13px;
        min-height: unset;
        max-height: 66px;
        -webkit-line-clamp: 3;
        line-clamp: 3;
        margin-bottom: 16px;
    }

    .ai4s-scen-btns {
        flex-wrap: wrap;
        gap: 8px;
        min-height: unset;
    }

    .ai4s-scen-btn {
        padding: 4px 14px;
        font-size: 13px;
    }

    /* 案例视频 */
    .ai4s-video-wrap {
        border-radius: 12px;
    }

    .ai4s-video-play {
        width: 56px;
        height: 56px;
    }

    /* 合作生态 */
    .ai4s-eco-grid {
        grid-template-columns: repeat(3, 1fr);
        column-gap: 10px;
        row-gap: 12px;
        margin-top: 24px;
    }

    .ai4s-eco-card {
        min-height: 80px;
        padding: 8px;
        border-radius: 8px;
    }

    .ai4s-eco-card img {
        width: 80%;
    }

    /* tooltip 在移动端隐藏（无hover） */
    .ai4s-tooltip {
        display: none !important;
    }
}