/* ============================================================
   首页框架样式 —— 严格对齐参考站 www.szxh518.com/index.html
   板块顺序：Banner → 搜索条 → 产品中心 → 四大优势 → 关于我们
            → 工厂实力 → 新闻资讯
   说明：统一使用 rf- 前缀，避免影响站内其他页面（style.css）。
   色值取自参考站：主蓝 #419dea，深蓝 #0080eb，强调红 #f30
   ============================================================ */

/* ========== 1. 搜索条 sousuo ========== */
.rf-sousuo { background: #419dea; height: 55px; }
.rf-sousuo-in {
    width: 1200px; max-width: 94%; margin: 0 auto; height: 55px;
    display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.rf-sousuo-l { display: flex; align-items: center; gap: 12px; line-height: 55px; white-space: nowrap; }
.rf-sousuo-l b { color: #fff; font-size: 14px; font-weight: 400; }
.rf-sousuo-l a {
    color: #fff; font-size: 13px; line-height: 24px; padding: 0 12px;
    border: 1px solid rgba(255, 255, 255, .55); border-radius: 14px; transition: .25s;
}
.rf-sousuo-l a:hover { background: #fff; color: #419dea; border-color: #fff; }
.rf-sousuo-r { position: relative; flex: 0 0 356px; }
.rf-sousuo-r input {
    width: 356px; height: 35px; border: 1px solid #fff; border-radius: 20px;
    background: none; color: #fff; font-size: 13px; padding: 0 62px 0 20px; outline: none;
}
.rf-sousuo-r input::placeholder { color: rgba(255, 255, 255, .85); }
.rf-sousuo-r button {
    position: absolute; top: 0; right: 0; width: 55px; height: 35px; border: 0;
    border-radius: 30px; background: #f30 url(../ref/7.png) center no-repeat; cursor: pointer;
}

/* ========== 2. 产品中心 canpinone ========== */
.rf-prod { width: 1200px; max-width: 94%; margin: 22px auto 0; display: flex; gap: 23px; align-items: flex-start; }
.rf-prod-l { flex: 0 0 289px; width: 289px; border: 1px solid #419dea; background: #fff; }
.rf-prod-lhd { height: 54px; background: #419dea; display: flex; align-items: center; padding-left: 22px; gap: 14px; }
.rf-prod-lhd .rf-ico-catlist { flex: 0 0 auto; }
.rf-prod-lhd .rf-ico-catlist svg { display: block; width: 28px; height: 28px; fill: #fff; }
.rf-prod-lhd span { color: #fff; font-size: 18px; font-weight: 600; }
.rf-cats { padding: 0 16px 4px; }
.rf-cat { margin-top: 17px; }
.rf-cat-hd {
    height: 40px; background: #419dea; display: flex; align-items: center;
    padding-left: 12px; gap: 10px; cursor: pointer; transition: background .25s;
}
.rf-cat-hd:hover { background: #0080eb; }
/* 分类展开箭头：内联 SVG 绘制，不用图片 */
.rf-cat-hd .rf-ico-caret { flex: 0 0 16px; display: block; }
.rf-cat-hd .rf-ico-caret svg { display: block; width: 16px; height: 16px; fill: #fff; transition: transform .25s; }
.rf-cat.cur > .rf-cat-hd { background: #0080eb; }
.rf-cat-hd a { color: #fff; font-size: 17px; line-height: 40px; }
.rf-cat-subs { display: none; padding: 4px 0 2px 10px; }
.rf-cat.on .rf-cat-subs { display: block; }
.rf-cat-subs a { display: block; color: #333; font-size: 15px; line-height: 26px; }
.rf-cat-subs a:hover, .rf-cat-subs a.on { color: #f30; }
.rf-cat-pic { text-align: center; margin: 10px 0 6px; }
.rf-cat-pic img { display: inline-block; }

.rf-prod-r { flex: 1; min-width: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px 12px; }
.rf-pcard { display: block; border: 1px solid #419dea; background: #fff; transition: box-shadow .25s; }
.rf-pcard:hover { box-shadow: 0 6px 18px rgba(65, 157, 234, .35); }
/* 卡片图统一 4:3，全部按同一比例铺满，不裁不拉，网格整齐 */
.rf-pcard img {
    display: block; width: 100%; height: auto; aspect-ratio: 4 / 3;
    object-fit: cover; object-position: center; background: #fff;
}
.rf-pcard span {
    display: block; height: 35px; line-height: 35px; background: #419dea; color: #fff;
    text-align: center; font-size: 14px; padding: 0 8px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.rf-pcard:hover span { background: #0080eb; }
.rf-prod-empty { grid-column: 1 / -1; color: #999; font-size: 14px; padding: 40px 0; text-align: center; }

/* ========== 3. 标题带 zhuanye（image/images/5_03.jpg） ========== */
.rf-band { width: 1200px; max-width: 94%; margin: 34px auto 26px; }
.rf-band img { display: block; width: 100%; }

/* ========== 4. 四大优势 yousi1~4（四块无缝相接，同参考站） ========== */
.rf-adv {
    width: 100%; height: 380px; overflow: hidden;
    background-position: center; background-repeat: no-repeat; background-size: cover;
}
.rf-adv-1 { background-image: url(../ref/ys_bg01.jpg); }
.rf-adv-2 { background-image: url(../ref/ys_bg02.jpg); }
.rf-adv-3 { background-image: url(../ref/ys_bg03.jpg); }
.rf-adv-4 { background-image: url(../ref/ys_bg05.jpg); }
.rf-adv-in { width: 1200px; max-width: 94%; margin: 0 auto; padding-top: 90px; }
.rf-adv-in > .rf-adv-bd { max-width: 580px; }
.rf-adv.rev .rf-adv-in > .rf-adv-bd { margin-left: auto; text-align: right; }
.rf-adv.rev .rf-adv-in > .rf-adv-bd .rf-adv-btn { margin-left: auto; }
.rf-adv h4 { font-size: 28px; font-weight: 700; color: #222; margin: 0 0 10px; line-height: 1.3; }
.rf-adv h4 i { font-style: normal; font-size: 38px; color: #f30; margin-right: 10px; vertical-align: -3px; }
.rf-adv p { font-size: 20px; line-height: 36px; color: #333; }
.rf-adv p::before { content: "●"; color: #f30; margin-right: 10px; font-size: 14px; vertical-align: 3px; }
.rf-adv-btn {
    display: block; width: 150px; height: 35px; line-height: 35px; text-align: center;
    background: #f30; color: #fff; border-radius: 9px; margin-top: 20px; font-size: 15px;
}
.rf-adv-btn:hover { background: #e02b00; color: #fff; }

/* ========== 5. 关于我们 gongjain（image/images/11_02.jpg） ========== */
.rf-about {
    width: 100%; height: 392px; margin-top: 60px; overflow: hidden;
    background: url(../ref/11_02.jpg) no-repeat; background-size: 100% 100%;
    border: 1px solid #0080eb;
}
.rf-about-in { width: 1200px; max-width: 94%; margin: 0 auto; height: 390px; display: flex; align-items: center; gap: 0; }
/* 左侧厂房实景图，与参考站同尺寸：439 × 360 */
.rf-about-l { flex: 0 0 439px; }
.rf-about-l img { display: block; width: 439px; height: 360px; object-fit: cover; object-position: center 40%; }
.rf-about-r { flex: 1; min-width: 0; background: #fff; height: 360px; overflow: hidden; padding: 0 32px; }
.rf-about-r h5 { border-bottom: 1px solid #ccc; font-size: 32px; font-weight: 600; color: #222; margin: 0; padding: 20px 0 4px; line-height: 1.15; }
.rf-about-r h5 span { display: block; font-size: 20px; font-weight: 600; margin-top: 4px; }
.rf-about-r p { color: #919191; font-size: 13px; line-height: 26px; margin-top: 14px; text-indent: 2em; }
.rf-about-r .rf-about-more {
    display: inline-block; margin-top: 10px; color: #419dea; font-size: 13px;
}
.rf-about-r .rf-about-more:hover { color: #f30; }

/* ========== 6. 工厂实力（沿用站内 .sec / .factory-swiper 样式） ========== */

/* ========== 7. 新闻资讯 xinzixun ========== */
.rf-news { width: 1200px; max-width: 94%; margin: 40px auto 0; }
.rf-news-hd img { display: block; width: 100%; }
.rf-news-cols { display: flex; gap: 19px; margin: 30px 0 50px; }
.rf-ncol {
    background: #f5f5f5; border-top: 3px solid #419dea; min-height: 505px;
    padding: 0 24px 24px; display: flex; flex-direction: column;
    min-width: 0; /* 允许在 flex 容器中收缩，防止长标题把栏目撑出屏幕（移动端横向溢出的根源） */
}
.rf-ncol-1 { flex: 410 1 0; }
.rf-ncol-2 { flex: 412 1 0; }
.rf-ncol-3 { flex: 342 1 0; }
.rf-ncol-hd { display: flex; align-items: flex-start; justify-content: space-between; padding-top: 24px; }
.rf-ncol-hd b { font-size: 20px; color: #222; font-weight: 600; line-height: 1.2; }
.rf-ncol-hd b span { display: block; color: #bbb; font-size: 16px; font-weight: 400; margin-top: 5px; }
.rf-ncol-hd .plus {
    flex: 0 0 22px; width: 22px; height: 22px; background: #ddd; border-radius: 50%;
    color: #fff; text-align: center; line-height: 20px; font-size: 22px; margin-top: 9px; transition: background .25s;
}
.rf-ncol:hover .plus { background: #142291; }
.rf-ncol-pic { display: block; margin: 14px auto 0; width: 100%; }
.rf-ncol-list { margin-top: 6px; }
/* 标题 + 日期 左右分布：标题超长省略号，日期始终可见 */
.rf-ncol-list a {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    color: #333; font-size: 14px; height: 30px; line-height: 30px;
    margin-top: 10px; padding-bottom: 2px; border-bottom: 1px solid #ccc;
}
.rf-ncol-list a:hover { color: #142291; }
.rf-ncol-list a .t { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.rf-ncol-list a i { font-style: normal; flex: 0 0 auto; color: #999; font-size: 13px; }
.rf-ncol-more { display: block; text-align: center; color: #419dea; font-size: 13px; margin-top: 14px; }
.rf-ncol-more:hover { color: #f30; }

/* ========== 响应式 ========== */
@media (max-width: 1240px) {
    .rf-prod-r { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 1024px) {
    .rf-about { height: auto; padding: 24px 0; }
    .rf-about-in { height: auto; flex-wrap: wrap; }
    .rf-about-l { flex: 1 1 100%; text-align: center; }
    .rf-about-l img { width: 100%; max-width: 439px; height: auto; aspect-ratio: 439 / 360; margin: 0 auto; }
    .rf-about-r { flex: 1 1 100%; height: auto; padding: 20px 22px 26px; }
    .rf-about-r h5 { height: auto; line-height: 1.25; font-size: 24px; padding: 16px 0 12px; }
    .rf-about-r h5 span { font-size: 16px; }
    .rf-news-cols { flex-wrap: wrap; }
    .rf-ncol { flex: 1 1 100%; min-height: 0; }
}
@media (max-width: 900px) {
    .rf-prod { flex-direction: column; }
    .rf-prod-l { flex: 1 1 auto; width: 100%; }
    .rf-cats { padding-bottom: 12px; }

    /* ---- 四大优势（移动端重排）----
       背景图是 1920x380 的横幅插画，手机上 cover 裁切后必然压住文字。
       改为：文字放在白底上，插画从背景图裁出的移动版（assets/ref/m/）以
       整宽图片形式显示在文字下方，上下依次排列。 */
    .rf-adv { background-image: none; height: auto; padding: 0 0 30px; overflow: visible; }
    .rf-adv-in { padding-top: 26px; padding-bottom: 0; }
    .rf-adv-1 .rf-adv-in { padding-top: 30px; }
    .rf-adv + .rf-adv .rf-adv-in { border-top: 1px dashed #e3e3e3; }
    .rf-adv-in > .rf-adv-bd { max-width: none; }
    .rf-adv.rev .rf-adv-in > .rf-adv-bd { margin-left: 0; text-align: left; }
    .rf-adv.rev .rf-adv-in > .rf-adv-bd .rf-adv-btn { margin-left: 0; }
    .rf-adv h4 { font-size: 21px; margin-bottom: 8px; }
    .rf-adv h4 i { font-size: 28px; vertical-align: -2px; }
    .rf-adv p { font-size: 15px; line-height: 27px; }
    .rf-adv-btn { margin-top: 14px; width: 132px; height: 32px; line-height: 32px; font-size: 14px; }
    .rf-adv::after {
        content: ""; display: block; width: 100%; margin-top: 18px;
        aspect-ratio: 972 / 380; background-size: cover; background-position: center;
    }
    .rf-adv-1::after { background-image: url(../ref/m/ys_bg01.jpg); }
    .rf-adv-2::after { background-image: url(../ref/m/ys_bg02.jpg); }
    .rf-adv-3::after { background-image: url(../ref/m/ys_bg03.jpg); }
    .rf-adv-4::after { background-image: url(../ref/m/ys_bg05.jpg); }

    /* ---- 分类树：手机上默认全部收起，只展开当前分类（点标题可展开其它）---- */
    .rf-cat.on .rf-cat-subs { display: none; }
    .rf-cat.cur .rf-cat-subs { display: block; }

    .rf-sousuo { height: auto; padding: 10px 0; }
    .rf-sousuo-in { height: auto; flex-direction: column; align-items: stretch; gap: 10px; }
    .rf-sousuo-l { line-height: 24px; flex-wrap: wrap; }
    .rf-sousuo-r { flex: 1 1 auto; }
    .rf-sousuo-r input { width: 100%; }
}
@media (max-width: 640px) {
    .rf-prod-r { grid-template-columns: repeat(2, 1fr); gap: 10px 8px; }
    .rf-pcard span { font-size: 12px; height: 30px; line-height: 30px; }
    .rf-news { margin-top: 26px; }
    .rf-band { margin-top: 22px; }
}