/* section-1 */
.section-1 {
    padding: 3rem 0;
}
.section-1 .container .content-txt {
    margin-bottom: 1rem;
    letter-spacing: 2px;
}
.section-1 .container .content-txt .title-en {
    margin: 1rem 0;
}
.section-1 .container .content-txt .des {
    max-width: 50.5rem;
    margin: 0 auto;
}
.section-1 .container .content-img {
    width: 100%;
    height: auto;
    padding: 0;
    border-radius: 2rem;
    overflow: hidden;
}
.section-1 .container .content-img:hover img {
    transform: scale(1.02);
}
.section-1 .container .content-img img {
    width: 100%;
    display: block;
    transition: all 0.3s ease-in-out;
}

/* section-2 */
.section-2 {
    padding: 2rem 0 0;
}
.section-2 .container {
    position: relative;
    overflow: hidden;
}
.section-2 .container .content-txt {
    margin-bottom: 5rem;
    letter-spacing: 2px;
}
.section-2 .container .content-txt .title-en {
    margin: 1rem 0;
}
.section-2 .container .content-capacity {
    display: flex;
    justify-content: space-between;
}
.section-2 .container .content-capacity .item {
    position: relative;
    flex: 0 1 calc(20% - 2rem);
    max-width: 15rem;
    text-align: center;
    gap: 2rem;
}
.section-2 .container .content-capacity .item .num {
    color: #fff;
    font-family: var(--font-montserrat);
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 900;
    position: relative;
    z-index: 2;
}
.section-2 .container .content-capacity .item .num::after {
    content: '';
    position: absolute;
    display: block;
    width: 100%;
    height: 15px;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(51, 189, 189, 0.15);
    border-radius: 15px;
    z-index: -1;
}
.section-2 .container .content-capacity .item .item-title {
    color: var(--moki-accent);
    margin: 1rem 0 0 0;
}
.section-2 .container .content-capacity .item img {
    width: 85%;
    position: relative;
    top: 4rem;
}
.section-2 .container .content-bg {
    position: absolute;
    bottom: 0;
    transform: translateY(35%);
}
.section-2 .container .content-bg img {
    width: 100%;
}

/* section-3 */
.section-3 {
    padding: 0;
    position: relative;
}
/* .section-3::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,0,0,0.8), rgba(0,0,0,0.5));
    z-index: 0;
} */
.section-3 .content-txt {
    position: absolute;
    width: 80%;
    margin: 0 auto;
    max-width: 750px;
    top: 7%;
    left: 50%;
    translate: -50%;
    z-index: 2;
}
.section-3 .content-txt .title-en {
    margin: 1rem 0;
}
.section-3 .content-list {
    display: flex;
    gap: 0;
}
.section-3 .content-list .item {
    aspect-ratio: 0.35;
    flex: 20%;
    max-height: 100vh;
    overflow: hidden;
    color: #fff;
    position: relative;
    cursor: pointer;
}
.section-3 .content-list .item.item-1 {
    background: linear-gradient(180deg, rgba(0,0,0,0.69) 10%, rgba(0,0,0,0.5)),url(../../imgs/eliquid_research_1_direction.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-1:hover,
.section-3 .content-list .item.item-1.active {
    background: linear-gradient(180deg, rgba(0,0,0,0.49) 0, rgba(0,0,0,0.1)),url(../../imgs/eliquid_research_1_direction.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-2 {
    background: linear-gradient(180deg, rgba(0,0,0,0.69) 10%, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_2_team.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-2:hover,
.section-3 .content-list .item.item-2.active {
    background: linear-gradient(180deg, rgba(0,0,0,0.49) 0, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_2_team.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-3 {
    background: linear-gradient(180deg, rgba(0,0,0,0.69) 10%, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_3_invest.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-3:hover,
.section-3 .content-list .item.item-3.active {
    background: linear-gradient(180deg, rgba(0,0,0,0.49) 0, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_3_invest.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-4 {
    background: linear-gradient(180deg, rgba(0,0,0,0.69) 10%, rgba(0,0,0,0.45)), url(../../imgs/eliquid_research_4_develop.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-4:hover,
.section-3 .content-list .item.item-4.active {
    background: linear-gradient(180deg, rgba(0,0,0,0.49) 0, rgba(0,0,0,0.45)), url(../../imgs/eliquid_research_4_develop.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-5 {
    background: linear-gradient(180deg, rgba(0,0,0,0.69) 10%, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_5_quality.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item.item-5:hover,
.section-3 .content-list .item.item-5.active {
    background: linear-gradient(180deg, rgba(0,0,0,0.49) 0, rgba(0,0,0,0.5)), url(../../imgs/eliquid_research_5_quality.webp);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.section-3 .content-list .item:hover,
.section-3 .content-list .item.active {
    filter: brightness(1.1);
}
.section-3 .content-list .item:hover .item-title,
.section-3 .content-list .item:hover .desc,
.section-3 .content-list .item.active .item-title,
.section-3 .content-list .item.active .desc {
    visibility: visible;
}
.section-3 .content-list .item .item-title {
    position: absolute;
    width: max-content;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    visibility: hidden;
}
.section-3 .content-list .item .desc {
    position: absolute;
    width: calc(100% - 2rem);
    bottom: 12%;
    background-color: rgba(51, 189, 189, 0.5);
    margin: 0 15px;
    padding: 2rem;
    border-radius: 1rem;
    color: #eee;
    visibility: hidden;
    text-align: center;
}

/* section-4 */
.section-4 {
    padding: 4rem 0 3rem;
}
.section-4 .container .content-txt {
    margin-bottom: 2rem;
    letter-spacing: 2px;
}
.section-4 .container .content-txt .title-en {
    margin: 1rem 0;
}

/* 定制化 swiper */
.eliquid-customize-swiper {
    overflow: hidden;
    padding: 0 0 0 5%;
}
.eliquid-customize-swiper .swiper-slide {
    height: auto;
}
.eliquid-customize-swiper .card {
    display: flex;
    flex-direction: column;
    border-radius: 1.5rem;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease;
}
.eliquid-customize-swiper .card:hover {
    transform: translateY(-5px);
}
.eliquid-customize-swiper .card .img-box {
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    border-radius: 1.5rem 1.5rem 0 0;
}
.eliquid-customize-swiper .card .img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}
.eliquid-customize-swiper .card:hover .img-box img {
    transform: scale(1.05);
}
.eliquid-customize-swiper .card .txt-box {
    padding: 1.5rem;
    color: #fff;
}
.eliquid-customize-swiper .card .txt-box .item-title {
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--moki-accent);
    margin-bottom: 0.75rem;
}
.eliquid-customize-swiper .card .txt-box .desc {
    line-height: 1.6;
    color: #ccc;
}

/* 定制化 swiper 导航按钮：位于 swiper 两侧，垂直居中 */
.eliquid-customize-swiper .swiper-button-prev,
.eliquid-customize-swiper .swiper-button-next {
    width: 3rem;
    height: 3rem;
    color: var(--moki-accent);
    background-image: none;
    border: 2px solid var(--moki-accent);
    border-radius: 50%;
    transition: color 0.3s ease, background-color 0.3s ease;
}
.eliquid-customize-swiper .swiper-button-prev:after,
.eliquid-customize-swiper .swiper-button-next:after {
    font-size: 1.5rem;
    font-weight: 700;
}
.eliquid-customize-swiper .swiper-button-prev:hover,
.eliquid-customize-swiper .swiper-button-next:hover {
    color: #fff;
    background-color: var(--moki-accent);
}

/* section-5: 雾化液定制 */
.section-5 {
    padding: 3rem 0 5rem;
}
.section-5 .container .content-txt {
    margin-bottom: 2rem;
    letter-spacing: 2px;
}

/* 主分类卡片 */
.customize-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.customize-tabs .tab-card {
    position: relative;
    border-radius: 1.5rem;
    cursor: pointer;
    min-height: 12rem;
    transition: transform 0.3s ease;
    aspect-ratio: 1.41;
}
.customize-tabs .tab-card:hover {
    transform: translateY(-4px);
}
.customize-tabs .tab-card .card-bg {
    position: absolute;
    border-radius: 1.5rem;
    overflow: hidden;
    inset: 0;
    z-index: 1;
}
.customize-tabs .tab-card .card-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.customize-tabs .tab-card .card-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.55) 100%);
    z-index: 2;
}
.customize-tabs .tab-card .card-icon,
.customize-tabs .tab-card .card-title {
    position: relative;
    z-index: 3;
}
.customize-tabs .tab-card .card-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4.5rem;
    height: 4.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.customize-tabs .tab-card .card-icon img {
    width: 23.5%;
    height: auto;
    margin: 1rem auto;
}
.customize-tabs .tab-card .card-title {
    position: absolute;
    top: 2rem;
    left: 2rem;
    right: 0;
    text-align: center;
    color: #fff;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 500;
    letter-spacing: 2px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    background-color: rgba(0, 0, 0, 0.3);
    display: flex;
    width: fit-content;
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
}

/* 激活态卡片 */
.customize-tabs .tab-card.active {
    background: #264446;
    box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}
.customize-tabs .tab-card.active .card-bg {
    opacity: 0;
}
.customize-tabs .tab-card.active .card-icon {
    opacity: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    top: 50%;
    width: 50%;
    height: auto;
    aspect-ratio: 1;
    text-align: center;
    color:#fff;
    font-weight: 400;
    font-size: 1rem;
    background-color: #627d7e;
    border-radius: 50%;
}
.customize-tabs .tab-card.active .card-title {
    display: none;
}
.customize-tabs .tab-card.active::after {
    content: '';
    position: absolute;
    bottom: calc(-0.8rem + 1px);
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 0.8rem solid transparent;
    border-right: 0.8rem solid transparent;
    border-top: 0.8rem solid #264446;
    z-index: 4;
}

/* 选项面板 */
.tab-panels {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1.5rem;
    padding: 2rem 2.5rem;
    overflow: hidden;
}
.tab-panel {
    display: none;
    animation: fadeIn 0.35s ease;
}
.tab-panel.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.tab-panel .panel-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.25rem 0;
}
.tab-panel .panel-row + .panel-row {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.tab-panel .panel-row .row-title {
    flex: 0 0 auto;
    min-width: 5.5rem;
    color: var(--moki-accent);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 1px;
}
.tab-panel .panel-row .option-list {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem 2rem;
    justify-content: flex-start;
}
.tab-panel .panel-row .option-list .option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    font-size: 0.85rem;
    min-width: 3.5rem;
    transition: transform 0.2s ease;
}
.tab-panel .panel-row .option-list .option:hover {
    transform: translateY(-3px);
}
.tab-panel .panel-row .option-list .option img {
    width: auto;
    height: 3rem;
    object-fit: contain;
    display: block;
    cursor: pointer;
}


/* ========== 响应式 ========== */

/* ≤1200：5列→4列 */
@media screen and (max-width: 1200px) {
    .section-2 .container .content-capacity .item {
        flex: 0 1 calc(25% - 1.5rem);
    }
}

/* ≤1024：5列→3列，间距缩小 */
@media screen and (max-width: 1024px) {
    .section-1 {
        padding: 3.5rem 0;
    }
    .section-2 {
        padding: 3.5rem 0;
    }
    .section-2 .container .content-capacity {
        flex-wrap: wrap;
        row-gap: 3.5rem;
        column-gap: 1.5rem;
        justify-content: center;
    }
    .section-2 .container .content-capacity .item {
        flex: 0 1 calc(33.333% - 1.5rem);
        max-width: 12rem;
    }

    .section-3 {
        padding: 3.5rem 0;
    }
    .section-3 .content-list {
        flex-wrap: wrap;
        justify-content: center;
    }

    .section-4 {
        padding: 3.5rem 0;
    }
    .customize-tabs {
        gap: 1rem;
    }
    .customize-tabs .tab-card {
        min-height: 10rem;
        border-radius: 1.25rem;
    }
    .tab-panels {
        padding: 1.5rem 1.75rem;
    }
    .tab-panel .panel-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .tab-panel .panel-row .option-list {
        width: 100%;
        gap: 1rem 1.5rem;
    }
}

/* ≤768：content-list 竖直排列，项目数控制在2行 */
@media screen and (max-width: 768px) {
    .section-1 {
        padding: 2.5rem 0;
    }
    .section-1 .container .content-img {
        border-radius: 1.5rem;
    }

    .section-2 {
        padding: 2.5rem 0;
    }
    .section-2 .container .content-capacity .item {
        flex: 0 1 calc(50% - 1.25rem);
        max-width: 10rem;
    }

    .section-3 {
        padding: 2.5rem 0;
    }
    .section-3 .content-txt {
        position: relative;
        translate: unset;
        left:auto;
        padding-bottom: 1rem;
    }
    .section-3 .content-list {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    .section-3 .content-list .item {
        flex: 0 1 calc(50% - 0.5rem);
        aspect-ratio: 16 / 11;
    }
    .section-3 .content-list .item .item-title {
        visibility: visible;
    }
    .section-3 .content-list .item .desc {
        padding: 1rem;
        font-size: 0.85rem;
        width: calc(100% - 1rem);
        visibility: visible;
    }

    .section-4 {
        padding: 2.5rem 0;
    }
    .eliquid-customize-swiper {
        padding: 0 0 0 3%;
    }
    .eliquid-customize-swiper .swiper-button-prev,
    .eliquid-customize-swiper .swiper-button-next {
        width: 2.25rem;
        height: 2.25rem;
    }
    .eliquid-customize-swiper .swiper-button-prev:after,
    .eliquid-customize-swiper .swiper-button-next:after {
        font-size: 1.1rem;
    }
    .eliquid-customize-swiper .card .img-box {
        aspect-ratio: 16 / 9;
    }
    .customize-tabs .tab-card {
        min-height: 8rem;
        border-radius: 1rem;
    }
    .customize-tabs .tab-card .card-title {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }
    .customize-tabs .tab-card.active .card-icon {
        width: 58%;
        height: auto;
    }
    .customize-tabs .tab-card.active .card-title {
        bottom: 1.25rem;
    }
    .tab-panels {
        padding: 1.25rem 1.25rem;
        border-radius: 1.25rem;
    }
    .tab-panel .panel-row .option-list .option img {
        height: 2.5rem;
    }
    .tab-panel .panel-row .option-list .option {
        font-size: 0.8rem;
        min-width: 3rem;
    }
}

/* ≤640：2列→1列 */
@media screen and (max-width: 640px) {
    .section-1 {
        padding: 2rem 0;
    }
    .section-2 {
        padding: 2rem 0;
    }
    .section-2 .container .content-capacity .item {
        flex: 0 1 100%;
        max-width: 14rem;
        margin: 0 auto;
        overflow: hidden;
    }
    .section-2 .container .content-capacity .item img {
        display: none;
    }
    .section-2 .container .content-bg {
        display: none;
    }

    .section-3 {
        padding: 2rem 0;
    }
    .section-3 .content-list {
        gap: 0.75rem;
    }
    .section-3 .content-list .item {
        flex: 0 1 100%;
        aspect-ratio: 16 / 9;
    }

    .section-4 {
        padding: 2rem 0;
    }
    .eliquid-customize-swiper .swiper-button-prev,
    .eliquid-customize-swiper .swiper-button-next {
        display: none;
    }
    .eliquid-customize-swiper .card .txt-box {
        padding: 1rem;
    }
    .customize-tabs {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    .customize-tabs .tab-card {
        min-height: 7rem;
        border-radius: 0.875rem;
    }
    .customize-tabs .tab-card .card-title {
        font-size: 0.8rem;
        top: 0.75rem;
    }
    .customize-tabs .tab-card.active .card-icon {
        width: 58%;
        height: auto;
    }
    .customize-tabs .tab-card.active .card-title {
        bottom: 1rem;
    }
    .tab-panels {
        padding: 1rem;
        border-radius: 1rem;
    }
    .tab-panel .panel-row {
        padding: 1rem 0;
    }
    .tab-panel .panel-row .row-title {
        font-size: 0.9rem;
    }
    .tab-panel .panel-row .option-list {
        gap: 0.75rem 1rem;
    }
    .tab-panel .panel-row .option-list .option img {
        height: 2rem;
    }
    .tab-panel .panel-row .option-list .option {
        font-size: 0.75rem;
        min-width: 2.5rem;
    }
}

/* ≤440 */
@media screen and (max-width: 440px) {
    .section-1 {
        padding: 1.5rem 0;
    }
    .section-1 .container .content-img {
        border-radius: 1rem;
    }
    .section-2 {
        padding: 1.5rem 0;
    }
    .section-3 {
        padding: 1.5rem 0;
    }
    .section-3 .content-list .item .desc {
        padding: 0.75rem;
    }
    .section-4 {
        padding: 1.5rem 0;
    }
    .customize-tabs {
        gap: 0.5rem;
    }
    .customize-tabs .tab-card {
        min-height: 6rem;
        border-radius: 0.75rem;
    }
    .customize-tabs .tab-card .card-title {
        font-size: 0.75rem;
        letter-spacing: 0;
    }
    .customize-tabs .tab-card.active .card-icon {
        width: 62%;
        height: auto;
    }
    .customize-tabs .tab-card.active .card-title {
        bottom: 0.75rem;
    }
    .tab-panels {
        padding: 0.875rem;
    }
    .tab-panel .panel-row .option-list .option img {
        height: 1.75rem;
    }
    .tab-panel .panel-row .option-list .option {
        font-size: 0.7rem;
    }
}