/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "微软雅黑", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: #fff;
    color: #444;
    line-height: 1.6;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: #444;
    text-decoration: none;
}

/* ===== 通用容器：固定最大宽度，居中，移动端留白 ===== */
.top,
.caidan,
.big-tp,
.chanpin-title,
.neirong-waikuang,
.neirong-wz-waikuang,
.footer,
.aboutme-big-tp,
.neirong-zt {
    width: 100%;
    max-width: 890px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== 顶部 Banner ===== */
.top {
    background: #fff url(images/top.jpg) no-repeat center top;
    background-size: contain;
    height: 52px;
    margin-top: 31px;
    margin-bottom: 25px;
}

/* ===== 导航 ===== */
.caidan {
    background: #fff url(images/caidan-bj.jpg) no-repeat center top;
    background-size: 100% 100%;
    height: 50px;
    margin-bottom: 17px;
    display: flex;
    justify-content: center;
    align-items: stretch;
}

.caidan-1 {
    width: 20px;
    flex: 0 0 20px;
    height: 50px;
}

.caidan-dangqian,
a.img1 {
    width: 110px;
    height: 50px;
    line-height: 50px;
    display: block;
    font-size: 14px;
    text-align: center;
    cursor: pointer;
    flex: 0 0 110px;
}

.caidan-dangqian {
    background: url(images/caidan-hover-bj.jpg) no-repeat center top;
    background-size: 100% 100%;
    color: #fff;
}

a.img1 {
    color: #b2b2b2;
    transition: color .2s ease;
}

a.img1:hover,
a.img1:focus {
    background: url(images/caidan-hover-bj.jpg) no-repeat -110px 0;
    color: #fff;
}

/* ===== 大图 / 轮播 ===== */
.big-tp {
    margin-bottom: 27px;
    height: auto;
    min-height: 214px;
}

#slideshow {
    position: relative;
    width: 100%;
    max-width: 890px;
    height: 214px;
    overflow: hidden;
    margin: 0 auto;
    background: #000;
}

#slideshow img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    animation: slideshow-fade 9s infinite;
    will-change: opacity;
}

#slideshow img:nth-child(1) { animation-delay: 0s; }
#slideshow img:nth-child(2) { animation-delay: 3s; }
#slideshow img:nth-child(3) { animation-delay: 6s; }

@keyframes slideshow-fade {
    0%   { opacity: 0; }
    5%   { opacity: 1; }
    30%  { opacity: 1; }
    35%  { opacity: 0; }
    100% { opacity: 0; }
}

/* ===== 标题栏 ===== */
.chanpin-title {
    background: url(images/title1.jpg) no-repeat center top;
    background-size: contain;
    height: 30px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

a.more {
    background: url(images/more.jpg) no-repeat center top;
    background-size: contain;
    width: 113px;
    height: 30px;
    display: block;
    margin-left: auto;
    cursor: pointer;
}

/* ===== 产品/设备行（flex 布局，可换行） ===== */
.neirong-waikuang,
.neirong-wz-waikuang {
    margin-bottom: 31px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
}

.neirong-wz-waikuang {
    margin-bottom: 20px;
}

.neirong-chanping1,
.neirong-chanping2 {
    width: 259px;
    flex: 0 0 259px;
    overflow: hidden;
}

.neirong-chanping2 {
    margin: 0 56px;
}

.neirong-chanping-wz1,
.neirong-chanping-wz2 {
    width: 259px;
    flex: 0 0 259px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    color: #444;
    background-color: #e3f5f5;
}

.neirong-chanping-wz2 {
    margin: 0 56px;
}

/* ===== 设备（两列） ===== */
.shebei-neirong-chanping1,
.shebei-neirong-chanping2 {
    width: 417px;
    flex: 0 0 417px;
    overflow: hidden;
}

.shebei-neirong-chanping2 {
    margin-left: 56px;
}

.shebei-neirong-chanping-wz1,
.shebei-neirong-chanping-wz2 {
    width: 417px;
    flex: 0 0 417px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    color: #444;
    background-color: #e3f5f5;
}

.shebei-neirong-chanping-wz2 {
    margin-left: 56px;
}

/* ===== 文本内容 ===== */
.neirong-zt {
    line-height: 30px;
    color: #444;
    padding: 0 10px;
}

.neirong-zt .aboutUsTxt {
    line-height: 40px;
    color: #333;
    margin: 0 50px;
}

.neirong-zt .aboutUsTxt p {
    margin-bottom: 8px;
}

.neirong-zt .aboutUsTxt a {
    color: #538c9f;
}

.neirong-zt .aboutUsTxt a:hover {
    color: #84B263;
}

/* ===== 页脚 ===== */
.footer {
    background: #fff;
    margin-top: 74px;
    margin-bottom: 22px;
    height: 50px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: block;
    width: 471px;
    height: 50px;
    flex-shrink: 0;
}

.beiAn {
    font-size: 12px;
    color: #8F8F8F;
    text-align: right;
    padding-right: 10px;
}

.beiAn a {
    color: #8F8F8F;
}

.beiAn a:hover {
    color: #538c9f;
}

/* ===== 关于我们大图 ===== */
.aboutme-big-tp {
    margin-top: 17px;
    margin-bottom: 47px;
    overflow: hidden;
}

/* ===== 响应式：平板及以下 ===== */
@media (max-width: 768px) {
    .top {
        margin-top: 15px;
        margin-bottom: 15px;
    }

    .caidan {
        height: auto;
        min-height: 50px;
        flex-wrap: wrap;
        background-size: cover;
    }

    .caidan-1 {
        display: none;
    }

    .caidan-dangqian,
    a.img1 {
        flex: 1 1 20%;
        min-width: 80px;
    }

    .neirong-chanping1,
    .neirong-chanping2,
    .neirong-chanping-wz1,
    .neirong-chanping-wz2 {
        flex: 1 1 30%;
        width: 30%;
        margin: 5px;
    }

    .shebei-neirong-chanping1,
    .shebei-neirong-chanping2,
    .shebei-neirong-chanping-wz1,
    .shebei-neirong-chanping-wz2 {
        flex: 1 1 45%;
        width: 45%;
        margin: 5px;
    }

    .neirong-zt .aboutUsTxt {
        margin: 0 15px;
        line-height: 32px;
    }

    .footer {
        margin-top: 30px;
    }
}

/* ===== 手机 ===== */
@media (max-width: 480px) {
    .caidan-dangqian,
    a.img1 {
        flex: 1 1 45%;
    }

    .neirong-chanping1,
    .neirong-chanping2,
    .neirong-chanping-wz1,
    .neirong-chanping-wz2 {
        flex: 1 1 100%;
        width: 100%;
        margin: 5px 0;
    }

    .shebei-neirong-chanping1,
    .shebei-neirong-chanping2,
    .shebei-neirong-chanping-wz1,
    .shebei-neirong-chanping-wz2 {
        flex: 1 1 100%;
        width: 100%;
        margin: 5px 0;
    }

    .neirong-zt .aboutUsTxt {
        margin: 0 10px;
    }
}