/* =========================================================
   HarmonicDrive 苏州璟丰机电 — 改版样式表
   设计：移动端优先 / 语义化 / 高性能 / 适配搜索引擎与 AI 抓取
   ========================================================= */

:root {
  --c-primary: #0a4ea3;       /* 工业蓝 */
  --c-primary-dark: #073a7a;
  --c-accent: #e8551d;        /* 行动橙 */
  --c-accent-dark: #c8430f;
  --c-ink: #1f2733;           /* 主文字 */
  --c-ink-soft: #55606e;      /* 次文字 */
  --c-line: #e4e9f0;          /* 分割线 */
  --c-bg: #ffffff;
  --c-bg-soft: #f4f7fb;       /* 浅灰底 */
  --c-bg-dark: #0d1b2e;       /* 深色footer */
  --radius: 12px;
  --shadow: 0 6px 22px rgba(10, 50, 110, .08);
  --shadow-hover: 0 14px 34px rgba(10, 50, 110, .16);
  --maxw: 1200px;
  --header-h: 84px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans CN", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-accent); }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0 0 .6em; line-height: 1.3; font-weight: 700; color: var(--c-ink); }
h1 { font-size: clamp(26px, 4vw, 40px); }
h2 { font-size: clamp(22px, 3vw, 30px); }
h3 { font-size: clamp(18px, 2.2vw, 22px); }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.clearfix::after { content: ""; display: block; clear: both; }

/* ---------- 顶部信息条 ---------- */
.topbar { background: var(--c-bg-dark); color: #cdd9e8; font-size: 13px; }
.topbar .container { display: flex; justify-content: space-between; align-items: center; height: 40px; flex-wrap: wrap; gap: 8px; }
.topbar a { color: #cdd9e8; }
.topbar .hot { color: #ffd9c7; font-weight: 600; }

/* ---------- 页头 / 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(160%) blur(8px);
  box-shadow: 0 2px 14px rgba(10, 50, 110, .08);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 16px; }
.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.brand .logo { width: 150px; flex: none; }
.brand .logo img { width: 100%; }
.brand .slogan { border-left: 3px solid var(--c-accent); padding-left: 12px; }
.brand .slogan strong { display: block; font-size: 15px; color: var(--c-primary); }
.brand .slogan span { font-size: 12px; color: var(--c-ink-soft); }
.header-cta { display: flex; align-items: center; gap: 18px; }
.header-cta .phone { text-align: right; white-space: nowrap; }
.header-cta .phone b { display: block; font-size: 20px; color: var(--c-accent); font-family: "DIN", var(--font); letter-spacing: .5px; line-height: 1.3; }
.header-cta .phone small { color: var(--c-ink-soft); font-size: 12px; }

/* 导航 */
.main-nav ul { display: flex; gap: 4px; }
.main-nav li { position: relative; }
.main-nav > ul > li > a {
  display: block; padding: 10px 15px; color: var(--c-ink); font-weight: 600; font-size: 16px; border-radius: 8px; white-space: nowrap;
}
.main-nav > ul > li > a:hover, .main-nav li.active > a { color: #fff; background: var(--c-primary); }
.main-nav .dropdown:hover .submenu, .main-nav .dropdown:focus-within .submenu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.submenu {
  position: absolute; top: 100%; left: 0; min-width: 180px;
  background: #fff; box-shadow: var(--shadow); border-radius: 10px; overflow: hidden;
  opacity: 0; visibility: hidden; transform: translateY(8px); transition: .2s; z-index: 50;
}
.submenu a { display: block; padding: 11px 18px; color: var(--c-ink); font-weight: 500; border-bottom: 1px solid var(--c-line); }
.submenu a:last-child { border-bottom: 0; }
.submenu a:hover { background: var(--c-bg-soft); color: var(--c-primary); }

/* 移动端菜单按钮 */
.menu-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; height: 3px; background: var(--c-primary); border-radius: 2px; margin: 5px 0; transition: .3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 通用区块 ---------- */
.section { padding: 64px 0; }
.section--soft { background: var(--c-bg-soft); }
.section--dark { background: var(--c-bg-dark); color: #e8eef6; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head .eyebrow { display: inline-block; color: var(--c-accent); font-weight: 700; letter-spacing: 2px; text-transform: uppercase; font-size: 13px; margin-bottom: 8px; }
.section-head h2 { margin: 0; }
.section-head p { color: var(--c-ink-soft); max-width: 720px; margin: 12px auto 0; }
.section-head .more { display: inline-block; margin-top: 14px; color: var(--c-primary); font-weight: 600; }
.section-head .more:hover { color: var(--c-accent); }

/* ---------- 首页轮播 ---------- */
.hero { position: relative; }
.hero .slide { position: relative; height: clamp(340px, 46vw, 560px); background-size: cover; background-position: center; display: flex; align-items: flex-end; padding-bottom: 40px; }
.hero .slide::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(13,27,46,.10), rgba(13,27,46,.55)); }
.hero .hero-inner { position: relative; z-index: 2; display: flex; }
.hero .slide .hero-copy { color: #fff; max-width: 640px; padding: 20px 26px; border-radius: 14px;
  background: linear-gradient(90deg, rgba(8,20,38,.82), rgba(8,20,38,.12)); backdrop-filter: blur(2px); }
.hero .slide .hero-copy h1 { color: #fff; font-size: clamp(20px, 2.4vw, 30px); margin-bottom: .35em; }
.hero .slide .hero-copy p { font-size: 15px; color: #d7e2f1; margin-bottom: .7em; }
.hero .hero-cta { display: inline-block; background: var(--c-accent); color: #fff; padding: 12px 28px; border-radius: 40px; font-weight: 700; }
.hero .hero-cta:hover { background: var(--c-accent-dark); color: #fff; }
.hero-nav { position: absolute; z-index: 5; top: 50%; transform: translateY(-50%); width: 46px; height: 46px; border: 0; border-radius: 50%; background: rgba(255,255,255,.85); cursor: pointer; font-size: 20px; color: var(--c-primary); box-shadow: var(--shadow); }
.hero-nav.prev { left: 16px; } .hero-nav.next { right: 16px; }
.hero-dots { position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 5; display: flex; gap: 10px; }
.hero-dots button { width: 12px; height: 12px; border-radius: 50%; border: 0; background: rgba(255,255,255,.6); cursor: pointer; }
.hero-dots button.active { background: var(--c-accent); width: 30px; border-radius: 8px; }

/* ---------- 分类入口 ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cat-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: .25s; display: flex; flex-direction: column; }
.cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.cat-card .thumb { aspect-ratio: 4/3; overflow: hidden; background: var(--c-bg-soft); }
.cat-card .thumb img { width: 100%; height: 100%; object-fit: contain; padding: 18px; }
.cat-card .body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.cat-card .body h3 { margin-bottom: 6px; }
.cat-card .body p { color: var(--c-ink-soft); font-size: 14px; flex: 1; }
.cat-card .body .go { font-weight: 700; color: var(--c-primary); }

/* ---------- 产品网格 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: .25s; display: flex; flex-direction: column; }
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.product-card .thumb { aspect-ratio: 1/1; background: var(--c-bg-soft); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card .thumb img { width: 100%; height: 100%; object-fit: contain; padding: 16px; transition: transform .35s; }
.product-card:hover .thumb img { transform: scale(1.06); }
.product-card .body { padding: 16px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.product-card .body h3 { font-size: 17px; margin-bottom: 8px; }
.product-card .body .desc { color: var(--c-ink-soft); font-size: 13px; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-card .body .more { margin-top: 12px; font-weight: 700; font-size: 14px; }

/* ---------- 应用领域 ---------- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.app-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 30px 24px; text-align: center; box-shadow: var(--shadow); transition: .25s; }
.app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.app-card .ico { width: 84px; height: 84px; margin: 0 auto 16px; border-radius: 50%; background: var(--c-bg-soft); display: flex; align-items: center; justify-content: center; }
.app-card .ico img { width: 56px; height: 56px; object-fit: contain; }
.app-card p { color: var(--c-ink-soft); font-size: 14px; }

/* ---------- 关于我们 ---------- */
.about-split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.about-split .media img { border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; }
.about-split .text .lead { font-size: 18px; color: var(--c-primary); font-weight: 700; }
.about-split .text p { color: var(--c-ink-soft); }

/* ---------- 友情链接 ---------- */
.links-bar { display: flex; flex-wrap: wrap; gap: 12px; }
.links-bar a { background: #fff; border: 1px solid var(--c-line); padding: 8px 16px; border-radius: 40px; font-size: 14px; color: var(--c-ink-soft); }
.links-bar a:hover { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ---------- 面包屑 ---------- */
.breadcrumb { background: var(--c-bg-soft); padding: 12px 0; font-size: 14px; color: var(--c-ink-soft); }
.breadcrumb a { color: var(--c-ink-soft); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb span.sep { margin: 0 8px; color: #b9c3d1; }

/* ---------- 侧栏 + 内容（产品/文章） ---------- */
.layout { display: grid; grid-template-columns: 260px 1fr; gap: 36px; align-items: start; }
.sidebar { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); position: sticky; top: calc(var(--header-h) + 16px); }
.sidebar .side-title { background: var(--c-primary); color: #fff; padding: 14px 18px; font-weight: 700; }
.sidebar ul li a { display: block; padding: 12px 18px; border-bottom: 1px solid var(--c-line); color: var(--c-ink); font-weight: 500; }
.sidebar ul li a:hover, .sidebar ul li.active a { background: var(--c-bg-soft); color: var(--c-primary); }
.sidebar .contact-card { padding: 18px; font-size: 14px; color: var(--c-ink-soft); }
.sidebar .contact-card b { color: var(--c-accent); font-size: 18px; }

/* ---------- 产品详情 ---------- */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; margin-bottom: 36px; }
.gallery .main-img { border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-bg-soft); aspect-ratio: 1/1; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.gallery .main-img img { width: 100%; height: 100%; object-fit: contain; padding: 18px; }
.gallery .thumbs { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.gallery .thumbs img { width: 76px; height: 76px; object-fit: contain; border: 1px solid var(--c-line); border-radius: 8px; background: #fff; padding: 6px; cursor: pointer; }
.gallery .thumbs img.active { border-color: var(--c-primary); }
.product-info h1 { margin-bottom: 10px; }
.product-info .tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.product-info .tag { background: var(--c-bg-soft); color: var(--c-primary); padding: 5px 12px; border-radius: 40px; font-size: 13px; font-weight: 600; }
.product-info .summary { color: var(--c-ink-soft); }
.product-info .actions { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; border-radius: 40px; font-weight: 700; border: 2px solid transparent; cursor: pointer; }
.btn--primary { background: var(--c-primary); color: #fff; }
.btn--primary:hover { background: var(--c-primary-dark); color: #fff; }
.btn--accent { background: var(--c-accent); color: #fff; }
.btn--accent:hover { background: var(--c-accent-dark); color: #fff; }
.btn--ghost { border-color: var(--c-primary); color: var(--c-primary); background: #fff; }
.btn--ghost:hover { background: var(--c-primary); color: #fff; }

/* 规格参数表 */
.spec-block { margin-top: 36px; }
.spec-block h2 { border-left: 4px solid var(--c-accent); padding-left: 12px; }
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { padding: 13px 16px; border-bottom: 1px solid var(--c-line); vertical-align: top; font-size: 14px; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th { background: var(--c-bg-soft); color: var(--c-primary); width: 200px; font-weight: 700; text-align: left; }
.spec-table td .sub { display: block; color: var(--c-ink-soft); padding-left: 14px; position: relative; }
.spec-table td .sub::before { content: "●"; position: absolute; left: 0; color: var(--c-accent); font-size: 10px; top: 4px; }
.spec-note { font-size: 13px; color: var(--c-ink-soft); margin-top: 10px; }

/* 描述富文本 */
.richtext img { max-width: 100%; border-radius: 10px; margin: 14px 0; border: 1px solid var(--c-line); }

/* ---------- FAQ（AI 友好） ---------- */
.faq-item { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; box-shadow: var(--shadow); }
.faq-item .q { width: 100%; text-align: left; background: none; border: 0; padding: 18px 22px; font-size: 17px; font-weight: 700; color: var(--c-ink); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq-item .q .plus { color: var(--c-accent); font-size: 24px; flex: none; transition: .2s; }
.faq-item.open .q .plus { transform: rotate(45deg); }
.faq-item .a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .a { max-height: 600px; }
.faq-item .a p { padding: 0 22px 20px; color: var(--c-ink-soft); margin: 0; }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; }
.contact-info { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.contact-info dl { display: grid; grid-template-columns: 90px 1fr; gap: 12px 14px; margin: 0; }
.contact-info dt { color: var(--c-primary); font-weight: 700; }
.contact-info dd { margin: 0; color: var(--c-ink); }
.contact-info .qr { text-align: center; margin-top: 22px; }
.contact-info .qr img { width: 160px; margin: 0 auto 8px; border: 1px solid var(--c-line); border-radius: 10px; }
.map-box { background: var(--c-bg-soft); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 20px; }
.baidu-map { width: 100%; height: 380px; background: #eaf1f8; border-radius: var(--radius); overflow: hidden; }
.baidu-map img { max-width: none; }   /* 修复百度地图控件图标被全局规则压缩 */
.map-fallback { margin-top: 12px; font-size: 14px; color: var(--c-ink-soft); }
.map-fallback a { color: var(--c-accent); font-weight: 600; }

/* ---------- 文章/简介 ---------- */
.article-body { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.article-body p { color: var(--c-ink-soft); font-size: 16px; }
.article-body .lead { font-size: 18px; color: var(--c-primary); font-weight: 700; }
.empty-note { background: #fff; border: 1px dashed var(--c-line); border-radius: var(--radius); padding: 40px; text-align: center; color: var(--c-ink-soft); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-bg-dark); color: #b9c7d8; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: 30px; }
.footer-grid .f-brand img { width: 170px; margin-bottom: 16px; }
.footer-grid .f-brand p { color: #93a4ba; font-size: 14px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #b9c7d8; font-size: 14px; }
.footer-col ul li a:hover { color: #fff; }
.footer-contact { margin-top: 18px; }
.footer-contact .tel { font-size: 22px; color: var(--c-accent); font-weight: 700; }
.footer-contact .qr { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.footer-contact .qr img { width: 90px; border-radius: 8px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); margin-top: 40px; padding: 20px 0; font-size: 13px; color: #8ea0b6; text-align: center; }
.footer-bottom a { color: #8ea0b6; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 移动端悬浮栏 ---------- */
.mobile-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 90; background: #fff; box-shadow: 0 -4px 16px rgba(0,0,0,.12); }
.mobile-bar ul { display: flex; }
.mobile-bar li { flex: 1; }
.mobile-bar a { display: flex; flex-direction: column; align-items: center; padding: 8px 4px; font-size: 12px; color: var(--c-ink); gap: 4px; }
.mobile-bar a.call { background: var(--c-accent); color: #fff; }

/* 返回顶部 */
.back-top { position: fixed; right: 20px; bottom: 80px; width: 46px; height: 46px; border-radius: 50%; background: var(--c-primary); color: #fff; border: 0; cursor: pointer; font-size: 20px; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transition: .25s; z-index: 95; }
.back-top.show { opacity: 1; visibility: visible; }

/* 在线客服浮窗 */
.float-kf { position: fixed; right: 20px; bottom: 140px; z-index: 94; }
.float-kf > button { width: 52px; height: 52px; border-radius: 50%; background: var(--c-primary); color: #fff; border: 0; cursor: pointer; font-size: 13px; box-shadow: var(--shadow); }
.kf-panel { position: absolute; right: 0; bottom: 60px; width: 240px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-hover); padding: 16px; display: none; }
.kf-panel.open { display: block; }
.kf-panel h5 { margin: 10px 0 6px; color: var(--c-ink); }
.kf-panel .row { font-size: 14px; color: var(--c-ink-soft); margin-bottom: 6px; }
.kf-panel img.qr { width: 120px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1360px) {
  .brand .logo { width: 132px; }
  .brand .slogan span { display: none; }
  .main-nav > ul > li > a { padding: 9px 12px; font-size: 15px; }
  .header-cta .phone b { font-size: 18px; }
}
@media (max-width: 1200px) {
  .brand .slogan { display: none; }
  .header-cta .phone small { display: none; }
}
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-grid .f-brand { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .brand .slogan { display: none; }
  .header-cta .phone { display: none; }
  .menu-toggle { display: block; }
  .main-nav { position: absolute; top: var(--header-h); left: 0; right: 0; background: #fff; box-shadow: var(--shadow); max-height: 0; overflow: hidden; transition: max-height .3s; }
  .main-nav.open { max-height: 80vh; overflow-y: auto; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 8px; }
  .main-nav > ul > li > a { border-radius: 0; }
  .submenu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; display: none; background: var(--c-bg-soft); }
  .main-nav .dropdown.open .submenu { display: block; }
  .cat-grid, .app-grid { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .about-split, .product-detail, .contact-grid, .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .mobile-bar { display: block; }
  .back-top { bottom: 70px; }
  .float-kf { bottom: 130px; }
  .section { padding: 44px 0; }
}
@media (max-width: 560px) {
  .cat-grid, .app-grid, .product-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero .slide .hero-copy p { font-size: 15px; }
  .article-body { padding: 22px; }
  .topbar .container > span:first-child { display: none; }
  .topbar .container { justify-content: center; }
}