/* ===== 青州市和利源建材机械厂 纯静态官网 · 全分辨率协调版 ===== */

:root {
    --c-main: #d70c18;
    --c-main-d: #b62021;
    --c-main-l: #ef011c;
    --c-dark: #1f1f1f;
    --c-foot: #0062ab;
    --c-foot-d: #03508f;
    --c-text: #333;
    --c-text-2: #5a6573;
    --c-text-3: #8a97a8;
    --c-line: #e6eaf0;
    --c-bg: #f4f6f9;
    --c-bg-2: #eef2f7;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Microsoft YaHei", "微软雅黑", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.75;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-main); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---------- 容器：桌面1280 标准 / 超大屏 1440 / 平板92% / 手机 94% ---------- */
.container { width: 1280px; max-width: 92%; margin: 0 auto; }
@media (min-width: 1600px) {
    .container { width: 1440px; }
    body { font-size: 16px; }
}

/* ---------- 顶部信息条（薄条，高26） ---------- */
.top-bar { background: var(--c-dark); color: #c5cdd6; font-size: 12px; }
.top-bar .container { display: flex; justify-content: flex-end; align-items: center; height: 26px; }
.top-bar .hotline { color: #ffd34d; font-weight: bold; font-size: 13px; letter-spacing: .5px; }
.top-bar .hotline::before { content: "☎ "; margin-right: 4px; }

/* ---------- 头部 ---------- */
.site-header { background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.08); position: sticky; top: 0; z-index: 100; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand .logo-img { height: 42px; width: auto; }
.brand .brand-text { display: none; }
/* 文字版logo */
.brand .brand-text-logo { display: flex; flex-direction: column; line-height: 1.1; }
.brand .brand-text-logo .brand-cn { font-size: 22px; font-weight: 800; color: var(--c-main); letter-spacing: 1px; }
.brand .brand-text-logo .brand-en { font-size: 9px; color: var(--c-text-3); letter-spacing: 2px; text-transform: uppercase; margin-top: 2px; }
.main-nav ul { display: flex; gap: 0; }
.main-nav a {
    display: block; padding: 6px 20px; font-size: 15px; color: #33414f; position: relative;
    white-space: nowrap;
}
.main-nav a.active, .main-nav a:hover { color: var(--c-main-l); }
.main-nav a.active::after, .main-nav a:hover::after {
    content: ""; position: absolute; left: 20px; right: 20px; bottom: -1px; height: 2px;
    background: var(--c-main); border-radius: 2px;
}
/* 桌面端（>=993px）：强制隐藏汉堡、强制显示水平文字菜单 */
@media (min-width: 993px) {
    .nav-toggle { display: none !important; }
    .main-nav { max-height: none !important; position: static !important; box-shadow: none !important; overflow: visible !important; }
    .main-nav ul { flex-direction: row !important; }
    .main-nav a { border-bottom: none !important; background: transparent !important; }
}
/* 平板（769~992px）：同样隐藏汉堡 + 水平文字菜单（因为768px也能塞进6个菜单项） */
@media (min-width: 769px) and (max-width: 992px) {
    .nav-toggle { display: none !important; }
    .main-nav { max-height: none !important; position: static !important; box-shadow: none !important; overflow: visible !important; }
    .main-nav ul { flex-direction: row !important; }
    .main-nav a { border-bottom: none !important; background: transparent !important; padding: 6px 10px !important; font-size: 13px !important; }
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2.5px; background: var(--c-main); border-radius: 2px; }

/* ---------- 首页 banner 16:6 严格比例 ---------- */
.hero { position: relative; background: #1a1a1a; }
.hero .slides { position: relative; width: 100%; aspect-ratio: 16 / 6; overflow: hidden; }
.hero .slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1s ease; background-size: cover; background-position: center; }
.hero .slide.active { opacity: 1; }
.hero .slide::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(20,20,20,.6) 0%, rgba(20,20,20,.35) 40%, rgba(20,20,20,.1) 100%); }
.hero .hero-inner { position: absolute; inset: 0; z-index: 2; display: flex; align-items: center; color: #fff; }
.hero .hero-inner .container { position: relative; }
.hero h1 { font-size: 40px; font-weight: bold; margin-bottom: 16px; letter-spacing: 3px; text-shadow: 0 2px 10px rgba(0,0,0,.4); line-height: 1.35; }
.hero .subtitle { font-size: 17px; margin-bottom: 22px; opacity: .96; line-height: 1.65; }
.hero .hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.hero .hero-tags span { padding: 5px 16px; background: rgba(215,12,24,.55); border: 1px solid rgba(255,255,255,.3); border-radius: 18px; font-size: 13px; }
.hero .btn { display: inline-block; padding: 12px 30px; background: var(--c-main); color: #fff; border-radius: 4px; font-size: 15px; font-weight: bold; box-shadow: 0 4px 14px rgba(215,12,24,.4); }
.hero .btn:hover { background: var(--c-main-d); color: #fff; transform: translateY(-2px); }
.hero .dots { position: absolute; bottom: 16px; left: 0; right: 0; z-index: 3; text-align: center; }
.hero .dots span { display: inline-block; width: 10px; height: 10px; margin: 0 4px; border-radius: 50%; background: rgba(255,255,255,.5); cursor: pointer; transition: .3s; }
.hero .dots span.active { background: #f50056; width: 26px; border-radius: 5px; }

/* 内页 banner：16:5 中等厚度（比16:4薄、比16:6厚） */
.page-banner { aspect-ratio: 16 / 5; background: linear-gradient(135deg, rgba(0,98,171,.75), rgba(215,12,24,.45)), url("/images/banner/page-banner.jpg") center/cover no-repeat; color: #fff; display: flex; align-items: center; }
.page-banner h1 { font-size: 28px; letter-spacing: 2px; margin-bottom: 6px; }
.page-banner .crumb { font-size: 13px; opacity: .85; }
.page-banner .crumb a:hover { color: #ffd34d; }

/* ---------- 区块 ---------- */
.section { padding: 44px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; margin-bottom: 26px; }
.section-head .en { font-size: 11px; color: var(--c-text-3); text-transform: uppercase; letter-spacing: 3px; display: block; margin-bottom: 6px; }
.section-head h2 { font-size: 26px; color: var(--c-dark); font-weight: bold; position: relative; display: inline-block; padding-bottom: 12px; }
.section-head h2::after { content: ""; position: absolute; left: 50%; transform: translateX(-50%); bottom: 0; width: 46px; height: 3px; background: var(--c-main); border-radius: 2px; }
.section-head .desc { margin-top: 10px; color: var(--c-text-2); font-size: 13px; }
.more-link { text-align: center; margin-top: 26px; }
.more-link a { display: inline-block; padding: 9px 28px; background: var(--c-main); color: #fff; border-radius: 28px; font-weight: bold; transition: .3s; font-size: 14px; }
.more-link a:hover { background: var(--c-main-d); color: #fff; }

/* 超大屏下 section 再加厚一点 */
@media (min-width: 1600px) {
    .section { padding: 52px 0; }
    .section-head h2 { font-size: 30px; }
    .hero h1 { font-size: 46px; }
    .hero .subtitle { font-size: 19px; }
    .main-nav a { font-size: 16px; padding: 8px 24px; }
    .page-banner h1 { font-size: 32px; }
}

/* ---------- 产品分类标签 ---------- */
.product-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 26px; }
.product-tabs a { padding: 7px 18px; background: #fff; border: 1px solid var(--c-line); border-radius: 20px; font-size: 13px; color: #4a5562; transition: .25s; }
.product-tabs a:hover, .product-tabs a.active { background: var(--c-main); color: #fff; border-color: var(--c-main); }

/* ---------- 产品网格 4列 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.product-card { background: #fff; border-radius: 4px; overflow: hidden; box-shadow: 0 2px 6px rgba(0,0,0,.05); transition: transform .25s, box-shadow .25s; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 10px 22px rgba(215,12,24,.12); }
.product-card .thumb { aspect-ratio: 4/3; overflow: hidden; background: var(--c-bg-2); }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; display:block; }
.product-card:hover .thumb img { transform: scale(1.06); }
.product-card .info { padding: 11px 12px 14px; text-align: center; }
.product-card .info .name { font-size: 14px; color: var(--c-dark); font-weight: 600; }
.product-card .info .cat { font-size: 11px; color: var(--c-text-3); margin-top: 2px; }
.product-card:hover .info .name { color: var(--c-main); }

/* ---------- 公司简介 ---------- */
.about-block .container { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.about-block .about-img { order: 1; }
.about-block .about-text { order: 2; }
.about-block .about-text .en { color: var(--c-text-3); font-size: 11px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 5px; display: block; }
.about-block .about-text h2 { font-size: 24px; color: var(--c-dark); margin-bottom: 14px; position: relative; padding-bottom: 12px; }
.about-block .about-text h2::after { content: ""; position: absolute; left: 0; bottom: 0; width: 54px; height: 3px; background: var(--c-main); opacity: .8; }
.about-block .about-text p { color: var(--c-text-2); margin-bottom: 10px; text-align: justify; font-size: 14px; }
.about-block .about-stats { display: flex; gap: 30px; margin-top: 18px; }
.about-block .about-stats .stat .num { font-size: 26px; color: var(--c-main); font-weight: bold; }
.about-block .about-stats .stat .label { font-size: 12px; color: var(--c-text-3); }
.about-block .about-img { border-radius: 6px; overflow: hidden; box-shadow: 0 10px 28px rgba(0,0,0,.18); aspect-ratio: 4/3; }
.about-block .about-img img { width: 100%; height: 100%; object-fit: cover; display:block; }

/* ---------- 优势 ---------- */
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.advantage-item { text-align: center; padding: 26px 16px; background: #fff; border-radius: 4px; border: 1px solid var(--c-line); transition: .25s; }
.advantage-item:hover { border-color: var(--c-main); transform: translateY(-3px); box-shadow: 0 10px 22px rgba(215,12,24,.1); }
.advantage-item .icon { width: 52px; height: 52px; margin: 0 auto 12px; border-radius: 50%; background: var(--c-main); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 22px; }
.advantage-item h3 { font-size: 15px; color: var(--c-dark); margin-bottom: 6px; }
.advantage-item p { font-size: 12px; color: var(--c-text-2); line-height: 1.7; }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-card { background: #fff; border-radius: 4px; overflow: hidden; box-shadow: 0 2px 6px rgba(0,0,0,.05); transition: transform .25s, box-shadow .25s; }
.news-card:hover { transform: translateY(-4px); box-shadow: 0 10px 22px rgba(215,12,24,.12); }
.news-card .thumb { aspect-ratio: 16/9; overflow: hidden; background: var(--c-bg-2); }
.news-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; display:block; }
.news-card:hover .thumb img { transform: scale(1.05); }
.news-card .body { padding: 16px 18px 18px; }
.news-card .date { font-size: 12px; color: var(--c-main); margin-bottom: 6px; }
.news-card .title { font-size: 15px; color: var(--c-dark); font-weight: 600; margin-bottom: 6px; line-height: 1.5; }
.news-card .desc { font-size: 12px; color: var(--c-text-2); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .more { display: inline-block; margin-top: 8px; font-size: 12px; color: var(--c-main); }

/* ---------- 发货现场 ---------- */
.delivery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.delivery-item { border-radius: 4px; overflow: hidden; box-shadow: 0 2px 6px rgba(0,0,0,.05); background: #fff; transition: transform .25s; }
.delivery-item:hover { transform: translateY(-3px); box-shadow: 0 10px 22px rgba(215,12,24,.12); }
.delivery-item .thumb { aspect-ratio: 4/3; overflow: hidden; background: var(--c-bg-2); }
.delivery-item .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; display:block; }
.delivery-item:hover .thumb img { transform: scale(1.05); }
.delivery-item .cap { padding: 9px 12px; text-align: center; font-size: 13px; color: #4a5562; }

/* ---------- 详情页 ---------- */
.detail-wrap { display: grid; grid-template-columns: 1fr 280px; gap: 28px; align-items: start; }
.detail-main { background: #fff; padding: 28px 32px; border-radius: 4px; box-shadow: 0 2px 6px rgba(0,0,0,.04); }
.detail-main h1 { font-size: 22px; color: var(--c-dark); margin-bottom: 10px; line-height: 1.4; }
.detail-meta { font-size: 12px; color: var(--c-text-3); padding-bottom: 14px; border-bottom: 1px dashed var(--c-line); margin-bottom: 18px; }
.detail-meta span { margin-right: 20px; }
.detail-content p { margin-bottom: 12px; color: var(--c-text-2); text-align: justify; }
.detail-content img { margin: 14px 0; border-radius: 4px; }
.detail-nav { margin-top: 28px; padding-top: 16px; border-top: 1px dashed var(--c-line); display: flex; justify-content: space-between; gap: 18px; }
.detail-nav a { font-size: 13px; color: var(--c-main); }
.sidebar .box { background: #fff; border-radius: 4px; padding: 18px 20px; margin-bottom: 20px; box-shadow: 0 2px 6px rgba(0,0,0,.04); }
.sidebar .box h3 { font-size: 15px; color: var(--c-dark); margin-bottom: 12px; padding-bottom: 8px; border-bottom: 2px solid var(--c-main); display: inline-block; }
.sidebar .contact-list li { font-size: 13px; color: var(--c-text-2); padding: 7px 0; border-bottom: 1px dashed var(--c-bg-2); }
.sidebar .contact-list li:last-child { border-bottom: none; }
.sidebar .contact-list .phone { color: var(--c-main); font-size: 18px; font-weight: bold; }
.sidebar .hot-list li { padding: 8px 0; border-bottom: 1px dashed var(--c-bg-2); }
.sidebar .hot-list li:last-child { border-bottom: none; }
.sidebar .hot-list a { font-size: 12px; color: #4a5562; display: block; }
.sidebar .hot-list a:hover { color: var(--c-main); }

/* ---------- 关于页 ---------- */
.about-page .about-content { background: #fff; padding: 32px 36px; border-radius: 4px; box-shadow: 0 2px 6px rgba(0,0,0,.04); }
.about-page .about-content h2 { font-size: 18px; color: var(--c-main); margin: 18px 0 10px; padding-left: 10px; border-left: 4px solid var(--c-main); }
.about-page .about-content h2:first-child { margin-top: 0; }
.about-page .about-content p { color: var(--c-text-2); margin-bottom: 10px; text-align: justify; font-size: 14px; }
.idea-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 8px; }
.idea-list .idea { padding: 14px 16px; background: var(--c-bg); border-radius: 4px; }
.idea-list .idea .k { color: var(--c-main); font-weight: bold; font-size: 13px; margin-bottom: 3px; }
.idea-list .idea .v { color: var(--c-text-2); font-size: 12px; }

/* ---------- 联系页 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.contact-full { width: 100%; }
.contact-info-card, .contact-map-card { background: #fff; border-radius: 4px; padding: 28px 30px; box-shadow: 0 2px 6px rgba(0,0,0,.04); }
.contact-info-card h2, .contact-map-card h2 { font-size: 18px; color: var(--c-dark); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--c-main); display: inline-block; }
.contact-info-card ul li { padding: 9px 0; font-size: 14px; color: #4a5562; border-bottom: 1px dashed var(--c-bg-2); display: flex; }
.contact-info-card ul li .k { width: 82px; color: var(--c-text-3); flex-shrink: 0; font-size: 12px; padding-top: 2px; }
.contact-info-card ul li .v { color: var(--c-dark); font-weight: 500; }
.contact-info-layout { display: grid; grid-template-columns: 1.5fr 1fr; gap: 24px; align-items: center; }
.contact-info-right { display: flex; justify-content: center; }
.contact-info-right .big-phone { margin-top: 0; width: 100%; max-width: 260px; }
.contact-info-card .big-phone { margin-top: 14px; padding: 14px 18px; background: var(--c-main); color: #fff; border-radius: 4px; text-align: center; }
.contact-info-card .big-phone .label { font-size: 12px; opacity: .9; }
.contact-info-card .big-phone .num { font-size: 22px; font-weight: bold; letter-spacing: 1px; }
.contact-map-card .map { width: 100%; height: 320px; border-radius: 4px; overflow: hidden; border: 1px solid var(--c-line); }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 18px; }
.service-grid .s { padding: 16px 12px; background: #fff; border-radius: 4px; text-align: center; border: 1px solid var(--c-line); }
.service-grid .s h4 { color: var(--c-main); font-size: 14px; margin-bottom: 4px; }
.service-grid .s p { font-size: 11px; color: var(--c-text-2); }

/* ---------- 留言表单样式保留（供扩展） ---------- */
.message-form { background: #fff; border-radius: 4px; padding: 28px 30px; box-shadow: 0 2px 6px rgba(0,0,0,.04); margin-top: 26px; }
.message-form h2 { font-size: 18px; color: var(--c-dark); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--c-main); display: inline-block; }
.message-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 14px; }
.message-form label { display: block; font-size: 13px; color: var(--c-text-2); margin-bottom: 5px; }
.message-form input, .message-form textarea { width: 100%; padding: 9px 12px; border: 1px solid var(--c-line); border-radius: 3px; font-size: 13px; font-family: inherit; color: var(--c-text); background: #fbfcfd; }
.message-form input:focus, .message-form textarea:focus { outline: none; border-color: var(--c-main); background: #fff; }
.message-form textarea { min-height: 100px; resize: vertical; }
.message-form .btn { display: inline-block; padding: 10px 30px; background: var(--c-main); color: #fff; border: none; border-radius: 3px; font-size: 14px; font-weight: bold; cursor: pointer; font-family: inherit; transition: .3s; }
.message-form .btn:hover { background: var(--c-main-d); }

/* ---------- 页脚（薄） ---------- */
.site-footer { background: var(--c-foot); color: #cfe0ef; padding: 28px 0 0; }
.site-footer .footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: 30px; padding-bottom: 22px; border-bottom: 1px solid var(--c-foot-d); }
.site-footer .f-col h3 { color: #fff; font-size: 14px; margin-bottom: 12px; }
.site-footer .f-col p { font-size: 12px; line-height: 1.9; color: #acc6df; }
.site-footer .f-col ul li { padding: 3px 0; }
.site-footer .f-col ul li a { font-size: 12px; color: #acc6df; }
.site-footer .f-col ul li a:hover { color: #ffd34d; }
.site-footer .f-col .f-phone { color: #ffd34d; font-size: 18px; font-weight: bold; margin: 4px 0; }
.site-footer .footer-bottom { text-align: center; padding: 10px 0; font-size: 12px; color: #8fb0d0; }
.site-footer .footer-bottom a { color: #8fb0d0; }
.site-footer .footer-bottom a:hover { color: #ffd34d; }
.filing { text-align: center; padding: 6px 0 14px; font-size: 11px; color: #8fb0d0; }
.filing a { color: #8fb0d0; }
.filing a:hover { color: #ffd34d; }
.filing .filing-row { display: inline-flex; align-items: center; gap: 5px; margin: 0 6px; }
.filing .filing-row img { width: 14px; height: 14px; }

/* ---------- 移动端底部拨打电话条 ---------- */
.mobile-callbar { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 200; height: 50px; box-shadow: 0 -2px 8px rgba(0,0,0,.15); }
.mobile-callbar a { flex: 1; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; font-size: 12px; }
.mobile-callbar .mc-right { background: var(--c-main); color: #fff; }
.mobile-callbar .mc-right strong { font-size: 16px; letter-spacing: 1px; }

/* ---------- 回到顶部 ---------- */
.back-top { position: fixed; right: 22px; bottom: 30px; width: 40px; height: 40px; background: var(--c-main); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; cursor: pointer; opacity: 0; visibility: hidden; transition: .3s; z-index: 99; box-shadow: 0 4px 12px rgba(215,12,24,.4); }
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--c-main-d); }

/* ============================================================
   响应式设计（断点明确、无重叠、互不冲突）
   > 1280px : 大屏桌面（默认样式生效：4/4/3/3 列）
   993~1280 : 小桌面/笔记本（仍为4列，仅微调导航和Hero字号）
   769~992  : 平板横屏（水平菜单，产品降为3列，新闻/发货3列）
   421~768  : 标准移动（汉堡菜单，网格2列）
   <= 420   : 小屏手机（单列）
   ============================================================ */

/* ---- 小桌面 / 笔记本（993~1280px，1366x768 这类常见分辨率） ---- */
@media (min-width: 993px) and (max-width: 1280px) {
    .product-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .advantage-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .news-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .delivery-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .hero .slides { aspect-ratio: 16 / 6; }
    .hero h1 { font-size: 36px; letter-spacing: 2.5px; }
    .hero .subtitle { font-size: 16px; }
    .main-nav a { padding: 6px 16px; font-size: 14px; }
}

/* ---- 平板横屏（769~992px）：水平文字菜单 + 产品3列 ---- */
@media (min-width: 769px) and (max-width: 992px) {
    .container { width: auto; max-width: 93%; }
    .product-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .advantage-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .news-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .delivery-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .about-block .container { grid-template-columns: 1fr; }
    .about-block .about-img { order: 2; }
    .about-block .about-text { order: 1; }
    .detail-wrap, .contact-wrap { grid-template-columns: 1fr; }
    .site-footer .footer-main { grid-template-columns: 1fr 1fr; gap: 22px; }
    .hero .slides { aspect-ratio: 16 / 7; }
    .hero h1 { font-size: 28px; letter-spacing: 1.5px; }
    .hero .subtitle { font-size: 14px; }
    .hero .hero-tags span { font-size: 12px; padding: 4px 12px; }
    .service-grid { grid-template-columns: repeat(3, 1fr); }
    .about-page .about-content { padding: 26px 24px; }
    .contact-info-card, .contact-map-card { padding: 24px 22px; }
    .contact-wrap { gap: 22px; }
}

/* ---- 平板竖屏 / 手机横屏（<=768px）：汉堡菜单 + 产品2列 ---- */
@media (max-width: 768px) {
    body { padding-bottom: 50px; font-size: 14px; }
    .container { width: auto; max-width: 94%; }

    /* 顶部信息条隐藏 */
    .top-bar { display: none; }

    /* 头部 + 汉堡菜单 */
    .site-header .container { height: 54px; }
    .brand { gap: 6px; }
    .brand .logo-img { height: 32px; }
    .brand .brand-text-logo .brand-cn { font-size: 18px; }
    .brand .brand-text-logo .brand-en { font-size: 8px; }
    .nav-toggle { display: flex; }
    .main-nav {
        position: fixed; top: 54px; left: 0; right: 0;
        background: #fff; max-height: 0; overflow: hidden;
        transition: max-height .35s ease;
        box-shadow: 0 6px 14px rgba(0,0,0,.12);
        z-index: 99;
    }
    .main-nav.open { max-height: 440px; }
    .main-nav ul { flex-direction: column; gap: 0; padding: 6px 0; }
    .main-nav a {
        padding: 12px 22px; border-bottom: 1px solid var(--c-bg-2);
        font-size: 14px; color: #333; letter-spacing: .5px;
    }
    .main-nav a.active::after, .main-nav a:hover::after { display: none; }
    .main-nav a.active, .main-nav a:hover { background: var(--c-bg); color: var(--c-main); }

    /* ★ 关键修复：移动端强制单列布局（文字在上，图片在下） */
    .about-block .container { gap: 22px; }
    .about-block .about-img { order: 2; }
    .about-block .about-text { order: 1; }
    .detail-wrap { grid-template-columns: 1fr; gap: 18px; }
    .contact-wrap { grid-template-columns: 1fr; gap: 18px; }

    /* Hero：移动端改为更高比例（16:9），文字显示在底部 */
    .hero .slides { aspect-ratio: 16 / 9; }
    .hero .slide::after { background: linear-gradient(180deg, rgba(0,0,0,.08) 0%, rgba(0,0,0,.6) 100%); }
    .hero .hero-inner { align-items: flex-end; padding-bottom: 30px; }
    .hero h1 { font-size: 20px; margin-bottom: 10px; letter-spacing: .8px; line-height: 1.4; }
    .hero .subtitle { display: none; }
    .hero .hero-tags { display: none; }
    .hero .btn { padding: 8px 22px; font-size: 13px; }
    .hero .dots { bottom: 10px; }
    .hero .dots span { width: 7px; height: 7px; margin: 0 3px; }
    .hero .dots span.active { width: 18px; }

    /* 内页 banner：移动端改为 16:7，更厚一些 */
    .page-banner { aspect-ratio: 16 / 7; }
    .page-banner h1 { font-size: 22px; letter-spacing: .8px; }
    .page-banner .crumb { font-size: 12px; }

    /* 区块紧凑 */
    .section { padding: 28px 0; }
    .section-head { margin-bottom: 20px; }
    .section-head h2 { font-size: 20px; padding-bottom: 10px; }
    .section-head h2::after { width: 40px; height: 2px; }
    .section-head .en { font-size: 10px; letter-spacing: 2px; margin-bottom: 4px; }
    .section-head .desc { margin-top: 8px; font-size: 12px; }

    /* 产品分类标签 */
    .product-tabs { gap: 6px; margin-bottom: 18px; }
    .product-tabs a { padding: 6px 12px; font-size: 12px; }

    /* 网格：两列为主 */
    .product-grid, .advantage-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .news-grid, .delivery-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }

    /* 卡片紧凑 */
    .product-card .info, .news-card .body { padding: 10px 10px 12px; }
    .product-card .info .name { font-size: 12px; }
    .product-card .info .cat { font-size: 10px; }
    .news-card .title { font-size: 13px; margin-bottom: 4px; }
    .news-card .date, .news-card .more { font-size: 11px; }
    .news-card .desc { font-size: 11px; line-height: 1.6; }
    .delivery-item .cap { padding: 7px 10px; font-size: 12px; }

    /* 关于我们 */
    .about-block .about-text h2 { font-size: 20px; margin-bottom: 12px; padding-bottom: 10px; }
    .about-block .about-text p { font-size: 13px; margin-bottom: 8px; }
    .about-block .about-stats { gap: 16px; margin-top: 14px; flex-wrap: wrap; }
    .about-block .about-stats .stat .num { font-size: 22px; }
    .about-block .about-stats .stat .label { font-size: 11px; }

    /* 核心优势 */
    .advantage-item { padding: 18px 12px; }
    .advantage-item .icon { width: 42px; height: 42px; font-size: 18px; margin-bottom: 8px; }
    .advantage-item h3 { font-size: 13px; margin-bottom: 4px; }
    .advantage-item p { font-size: 11px; line-height: 1.65; }

    /* 详情/内容页 */
    .detail-main, .about-page .about-content, .contact-info-card, .contact-map-card, .message-form { padding: 18px 14px; }
    .detail-main h1 { font-size: 19px; }
    .detail-content img { width: 100%; }
    .about-page .about-content h2 { font-size: 16px; margin: 14px 0 8px; padding-left: 8px; }

    /* 联系页 */
    .contact-info-layout { grid-template-columns: 1fr; gap: 18px; }
    .contact-info-right .big-phone { max-width: 100%; }
    .contact-info-card, .contact-map-card { padding: 20px 18px; }
    .contact-info-card h2, .contact-map-card h2 { font-size: 16px; margin-bottom: 12px; padding-bottom: 8px; }
    .contact-info-card ul li { font-size: 13px; padding: 7px 0; }
    .contact-info-card ul li .k { width: 64px; font-size: 11px; }
    .contact-info-card .big-phone { margin-top: 12px; padding: 12px 16px; }
    .contact-info-card .big-phone .num { font-size: 20px; }
    .contact-map-card .map { height: 240px; }
    .service-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }

    /* 详情页侧边栏：移动端不显示280px固定宽度 */
    .sidebar .box { padding: 16px 14px; margin-bottom: 16px; }

    /* 其他 */
    .idea-list { grid-template-columns: 1fr; gap: 10px; }
    .site-footer .footer-main { grid-template-columns: 1fr 1fr; gap: 18px; padding-bottom: 18px; }
    .site-footer { padding-top: 24px; }
    .site-footer .footer-bottom { padding: 8px 0; font-size: 11px; }
    .filing { padding: 6px 0 12px; font-size: 10px; }
    .more-link { margin-top: 22px; }
    .more-link a { padding: 8px 24px; font-size: 13px; }
    .mobile-callbar { display: flex; }
    .back-top { bottom: 60px; right: 12px; width: 36px; height: 36px; font-size: 16px; }
}

/* 小屏手机（<=420） */
@media (max-width: 420px) {
    .product-grid, .advantage-grid, .news-grid, .delivery-grid { grid-template-columns: 1fr; }
    .service-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 17px; letter-spacing: .3px; }
    .hero .btn { padding: 7px 18px; font-size: 12px; }
    .site-footer .footer-main { grid-template-columns: 1fr; }
}