.section-title-wrap {
    text-align: center;
    margin-bottom: 4.5rem;
}

.section-title {
    font-size: 3.6rem;
    color: #0e387a;
    font-weight: bold;
    display: inline-block;
    position: relative;
    padding-bottom: 1.5rem;
}

.section-title.green-border::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 8rem;
    height: 0.4rem;
    background: #27ae60;
}



.philosophy-section {
    padding: 14rem 0;
    background: #eaedf5;
}

.philosophy-wrap {
    display: flex;
    gap: 8rem;
    align-items: center;
}

.philosophy-left {
    width: 64rem;
    height: 79rem;
}

.philosophy-left img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.5rem;
}

.philosophy-right {
    width: 88rem;
}

.about-tit{
    color: #004693;
    font-size: 6.8rem;
    font-weight: bold;
    line-height: 1.2;
    padding-bottom: 4rem;
    position: relative;
}

.about-tit::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    display: inline-block;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, #004693, #60ce94);
}

.philosophy-right .about-tit{
    background: url(../images/pinzhi_07.png) no-repeat right top;
    background-size: auto 80%;
}

.philosophy-right h4 {
    font-size: 2.8rem;
    color: #157f47;
    margin-top: 5rem;
}

.philosophy-right p {
    font-size: 2rem;
    color: #777;
    margin-top: 3rem;
}

.quality-section {
    padding: 11rem 0;
    background: #f6f8fc;
}

.quality-content {
    display: flex;
    gap: 5rem;
    align-items: center;
}

.quality-left {
    width: 80rem;
}

.quality-top-text{
    font-size: 2rem;
    color: #777;
    margin:4rem 0
}

.quality-item {
    background: #0e387a;
    color: #ffffff;
    padding: 2rem 3rem;
    border-radius: 0.3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 2.8rem;
    transition: 0.3s;
    cursor: pointer;
    margin-bottom: 2rem;
}
.quality-item.open {
    margin-bottom: 0;
}

.quality-item:hover {
    background: #154c9e;
}

.quality-item .icon-arrow {
    display: inline-block;
    display: inline-block;
    transition: 0.3s;
    width: 2.4rem;
    height: 1.4rem;
    background: url(../images/arrowtop.png) no-repeat;
    background-size: 100% 100%;
    transform: rotate(180deg);
}

.quality-reply {
    display: none;
    background: #eaedf5;
    padding: 3rem;
    border-radius: 0 0 0.3rem 0.3rem;
    color: #777;
    font-size: 2rem;
    margin-bottom: 2rem;
}
.quality-reply p {
    margin: 0;
}

.quality-item.open .icon-arrow {
    transform: rotate(0);
}

.quality-right {
    width: 80rem;
}
.quality-right img{
    width: 80rem;
}

.safety-section {
    padding: 10rem 0 12rem;
    background: #eaedf5;
}

.safety-section .section-title-wrap {
    margin-bottom: 5rem;
}

.safety-grid {
    display: flex;
    gap: 3rem;
    margin-top: 8rem;
}

.safety-card {
    flex: 1;
    border-radius: 0.5rem;
    overflow: hidden;
    position: relative;
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    height: 52rem;
}
.safety-card.active {
    flex: 3.5;
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.1);
    z-index: 2;
}

.safety-card .bg-img {
    width: 100%;
    height: 52rem;
    object-fit: cover;
}

.safety-card .icon-overlay {
    width: 13rem;
    height: 13rem;
    margin-bottom: 3rem;
}
.safety-card .icon-overlay img{
    width: auto;
    height: 100%;
}

.safety-card .text-wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 4rem;
    background: linear-gradient(to bottom, rgba(0, 69, 145, 0.1), rgba(0, 69, 145, 0.5));
}
.safety-card.active .text-wrap {
    background: linear-gradient(to bottom, rgba(0, 69, 145, 0.5), rgba(0, 69, 145, 1));
}

.safety-card .text-wrap h4 {
    width: 100%;
    font-size: 2.8rem;
    color: #fff;
    margin-bottom: 3rem;
    font-weight: 500;
    position: relative;
}
.safety-card.active .text-wrap h4  {
    padding-bottom: 3rem;
}
.safety-card.active .text-wrap h4::after  {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    display: inline-block;
    width: 40px;
    height: 5px;
    background: rgba(255, 255, 255, 0.3);
}

.safety-card .text-wrap p {
    width: 100%;
    font-size: 2rem;
    color: #fff;
    display: none;
}
.safety-card.active .text-wrap p {
    display: block;
}

.safety-bottom-text {
    margin-top: 4rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding-bottom: 2rem;
    border-bottom: 1px solid #dce4eb;
}

.safety-bottom-text h3 {
    font-size: 3.8rem;
    color: #157f47;
    font-weight: bold;
}

.safety-bottom-text p {
    font-size: 2rem;
    color: #777;
    flex: 1;
    text-align: right;
}

/* =========== 手机端响应式样式 (屏幕宽度 < 768px) =========== */
@media (max-width: 767px) {

    /* ---------- 高质量发展理念区 ---------- */
    .philosophy-section {
        padding: 4rem 0;
    }

    .philosophy-wrap {
        flex-direction: column;
        gap: 3rem;
    }

    .philosophy-left {
        width: 100%;
        height: auto;
        aspect-ratio: 1 / 1.2;
        max-height: 40rem;
    }

    .philosophy-left img {
        border-radius: 8px;
    }

    .philosophy-right {
        width: 100%;
    }

    .about-tit {
        font-size: 3.2rem;
        padding-bottom: 1.5rem;
        line-height: 1.3;
    }

    .about-tit::before {
        height: 3px;
    }

    .philosophy-right .about-tit {
        background: none;  /* 移除桌面端右侧装饰背景 */
    }

    .philosophy-right h4 {
        font-size: 1.8rem;
        margin: 2rem 0;
        line-height: 1.5;
    }

    .philosophy-right p {
        font-size: 1.4rem;
        line-height: 1.8;
        margin-bottom: 1rem;
    }

    /* ---------- 全流程质量管理体系区 ---------- */
    .quality-section {
        padding: 4rem 0;
    }

    .quality-content {
        flex-direction: column;
        gap: 3rem;
    }

    .quality-left {
        width: 100%;
    }

    .quality-top-text {
        font-size: 1.4rem;
        margin: 2rem 0;
        line-height: 1.8;
    }

    .quality-item {
        font-size: 1.8rem;
        padding: 1.5rem 2rem;
        margin-bottom: 1.5rem;
    }

    .quality-item .icon-arrow {
        font-size: 1.4rem;
    }

    .quality-reply {
        font-size: 1.3rem;
        padding: 2rem;
        margin-bottom: 1.5rem;
    }

    .quality-right {
        width: 100%;
    }

    .quality-right img {
        width: 100%;
        height: auto;
        max-height: 30rem;
        object-fit: contain;
    }

    /* ---------- 产品安全与稳定性保障区 ---------- */
    .safety-section {
        padding: 4rem 0 3rem;
    }

    .safety-grid {
        flex-direction: column;
        gap: 2rem;
        margin-top: 4rem;
    }

    .safety-card {
        width: 100%;
        height: auto;
        flex: none;
        border-radius: 8px;
        transition: none;
    }

    .safety-card .bg-img {
        height: 24rem;
    }

    /* 移动端取消active展开效果，三张卡片均显示基础信息 */
    .safety-card .text-wrap {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(to bottom, rgba(0, 69, 145, 0.2), rgba(0, 69, 145, 0.7));
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        padding: 2rem;
    }

    .safety-card.active .text-wrap {
        background: linear-gradient(to bottom, rgba(0, 69, 145, 0.2), rgba(0, 69, 145, 0.7));
    }

    .safety-card .icon-overlay {
        width: 6rem;
        height: 6rem;
        margin-bottom: 1.2rem;
    }

    .safety-card .text-wrap h4 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
        padding-bottom: 0;
    }

    /* 移除active状态下的下划线 */
    .safety-card.active .text-wrap h4::after {
        display: none;
    }

    .safety-card .text-wrap p {
        display: block;          /* 移动端直接显示描述文字 */
        font-size: 1.2rem;
        line-height: 1.5;
    }

    /* 底部安全说明 */
    .safety-bottom-text {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
        margin-top: 3rem;
        padding-bottom: 1.5rem;
    }

    .safety-bottom-text h3 {
        font-size: 2.4rem;
    }

    .safety-bottom-text p {
        font-size: 1.4rem;
        text-align: left;
        line-height: 1.8;
    }

    /* ---------- 通用容器 ---------- */
    .container {
        width: 92%;
        padding: 0;
    }
}