@charset "UTF-8";
/* ==========================================================================
   燕山医疗官网 · 全局样式
   北京科仪真燕山医疗技术有限公司
   设计方向：德日工业医疗器械 —— 大量留白 / 灰蓝主体 / 品牌红仅作强调
   ========================================================================== */

:root {
  --c-ink: #263B50;          /* 深蓝 主文字/深色块 */
  --c-steel: #425766;        /* 灰蓝 主品牌色 */
  --c-red: #D92D28;          /* 品牌红 仅作强调 */
  --c-mist: #F5F7F8;         /* 浅灰 分区背景 */
  --c-paper: #FFFFFF;        /* 白 */
  --c-text: #3D4B57;         /* 正文 */
  --c-soft: #7A8894;         /* 次级文字 */
  --c-line: #E3E8EC;         /* 分隔线 */
  --c-steel-08: rgba(66, 87, 102, .08);
  --c-steel-15: rgba(66, 87, 102, .15);

  --font-display: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "Consolas", "SF Mono", "Menlo", monospace;

  --wrap: 1240px;
  --radius: 6px;
  --shadow: 0 12px 40px rgba(38, 59, 80, .10);
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
}
/* height:auto 是配合 img 上的 width/height 属性使用的：
   有了 width/height，浏览器可提前算出宽高比、预留空间，消除 CLS；
   height:auto 保证在响应式缩窄时按比例缩放，不会压扁。 */
img { max-width: 100%; height: auto; display: block; }
/* picture 是纯逻辑容器，不生成盒子：
   若不设 display:contents，picture 会变成 flex/grid 容器的直接子项，
   使 .product-card-visual img 这类 "max-height:100% + object-fit:contain" 规则
   失去参照高度而塌陷或溢出，导致排版错乱。 */
picture { display: contents; }
/* 极旧内核（不支持 display:contents）兜底：至少按块级渲染，
   避免图片与相邻文字同行；这类内核占比已极低。 */
@supports not (display: contents) {
  picture { display: block; }
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; }
:focus-visible { outline: 2px solid var(--c-red); outline-offset: 3px; }

/* ---- 布局基元 ---- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 900px; margin: 0 auto; padding: 0 32px; }
.section { padding: 104px 0; }
.section--mist { background: var(--c-mist); }
.section-head { max-width: 720px; margin-bottom: 64px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---- 字级 ---- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: .32em; font-weight: 600;
  color: var(--c-red); text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--c-red); }
h1, h2, h3, h4 { color: var(--c-ink); font-weight: 700; line-height: 1.3; }
.h-display { font-size: clamp(34px, 4.6vw, 56px); letter-spacing: .01em; }
.h-section { font-size: clamp(26px, 3vw, 38px); }
.h-sub { font-size: 15px; color: var(--c-soft); margin-top: 14px; line-height: 1.9; }
.lede { font-size: 17px; color: var(--c-soft); margin-top: 22px; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 34px; border-radius: var(--radius);
  font-size: 15px; font-weight: 600; letter-spacing: .06em;
  transition: transform .18s ease, background .18s ease, color .18s ease, box-shadow .18s ease;
}
.btn--red { background: var(--c-red); color: #fff; }
.btn--red:hover { background: #B7231F; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(217, 45, 40, .28); }
.btn--ghost { border: 1px solid var(--c-steel-15); color: var(--c-ink); background: transparent; }
.btn--ghost:hover { border-color: var(--c-steel); background: var(--c-steel-08); transform: translateY(-2px); }
.btn--arrow .arr { transition: transform .18s ease; }
.btn--arrow:hover .arr { transform: translateX(4px); }

/* ---- 顶部导航 ---- */
.topbar { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.94); backdrop-filter: blur(10px); border-bottom: 1px solid var(--c-line); }
.topbar-in { display: flex; align-items: center; height: 76px; gap: 40px; }
.logo-link { display: inline-flex; align-items: flex-end; flex-shrink: 0; }
.logo-link img { height: 46px; width: auto; }
.logo-brand { display: flex; flex-direction: column; gap: 0; margin-left: 14px; flex-shrink: 0; }
.logo-brand .cn { font-size: 20px; font-weight: 700; color: var(--c-ink); letter-spacing: .12em; white-space: nowrap; line-height: 1.3; }
.logo-brand .en { font-size: 10px; color: var(--c-soft); letter-spacing: .18em; white-space: nowrap; font-family: var(--font-mono); line-height: 1.1; }
.nav { display: flex; align-items: stretch; gap: 4px; margin-left: auto; height: 76px; }
.nav > li { position: relative; display: flex; align-items: center; }
.nav > li > a {
  display: inline-flex; align-items: center; gap: 5px; padding: 8px 18px 5px;
  font-size: 15px; font-weight: 500; color: var(--c-ink); border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav > li > a:hover, .nav > li.is-active > a { color: var(--c-red); }
.nav > li.is-active > a { border-bottom-color: var(--c-red); }
.nav > li.has-sub > a::after {
  content: ""; width: 7px; height: 7px; margin-top: 2px;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px); opacity: .55;
}
.submenu {
  position: absolute; top: 76px; left: 50%; transform: translateX(-50%) translateY(8px);
  min-width: 250px; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 10px; opacity: 0; visibility: hidden;
  transition: opacity .18s ease, transform .18s ease;
}
.nav > li:hover .submenu, .nav > li:focus-within .submenu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.submenu a {
  display: block; padding: 11px 16px; border-radius: 4px; font-size: 14px; color: var(--c-text);
}
.submenu a:hover { background: var(--c-steel-08); color: var(--c-ink); }
.submenu .tag { color: var(--c-soft); font-size: 12px; margin-left: 8px; letter-spacing: .04em; }
.topbar-tel {
  display: inline-flex; align-items: center; gap: 8px; flex-shrink: 0;
  font-weight: 700; font-size: 17px; color: var(--c-ink); letter-spacing: .02em;
}
.topbar-tel:hover { color: var(--c-red); }
.topbar-tel svg { width: 17px; height: 17px; }
.nav-toggle { display: none; margin-left: auto; width: 42px; height: 42px; position: relative; }
.nav-toggle span { position: absolute; left: 10px; right: 10px; height: 2px; background: var(--c-ink); transition: .2s ease; }
.nav-toggle span:nth-child(1) { top: 14px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 26px; }
.nav-open .nav-toggle span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

/* 移动端菜单（默认隐藏，仅在移动断点显示） */
.m-nav { display: none; }

/* ---- 面包屑 ---- */
.crumbs { padding: 26px 0 0; font-size: 13px; color: var(--c-soft); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--c-line); }
.crumbs a:hover { color: var(--c-red); }
.crumbs [aria-current] { color: var(--c-ink); }

/* ---- 页脚 ---- */
.footer { background: var(--c-ink); color: rgba(255,255,255,.78); padding: 72px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 48px; padding-bottom: 56px; }
/* width:auto 必需：img 上带 width/height 属性时，若只锁 height 不锁 width，
   width 会取属性值（2172px）并被 max-width:100% 压到容器满宽，而高度锁死 -> 图片被拉变形。 */
.footer-brand img { height: 44px; width: auto; max-width: 100%; margin-bottom: 20px; }
.footer-brand p { line-height: 2; color: rgba(255,255,255,.62); }
.footer h4 { color: #fff; font-size: 15px; letter-spacing: .12em; margin-bottom: 18px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 12px; margin-bottom: 14px; line-height: 1.7; }
.footer-contact svg { width: 16px; height: 16px; margin-top: 5px; flex-shrink: 0; color: var(--c-red); }
.footer-contact a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 22px 0; font-size: 13px; color: rgba(255,255,255,.45); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
/* 页脚两个备案号之间的分隔符（京ICP备 | 京公网安备） */
.beian-sep { margin: 0 8px; opacity: .45; }

/* ---- 产品卡片 ---- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--c-steel-15); }
.product-card-visual {
  position: relative; display: flex; align-items: center; justify-content: center;
  height: 300px; padding: 36px; background: var(--c-mist); overflow: hidden;
}
.product-card-visual img { max-height: 100%; max-width: 100%; width: auto; height: auto; object-fit: contain; transition: transform .3s ease; }
.product-card:hover .product-card-visual img { transform: scale(1.05); }
.product-card-model {
  position: absolute; top: 16px; left: 18px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700; letter-spacing: .18em;
  color: var(--c-steel); background: #fff; border: 1px solid var(--c-line);
  padding: 4px 10px; border-radius: 3px;
}
.product-card-body { padding: 28px 28px 26px; display: flex; flex-direction: column; flex: 1; }
.product-card-body h3 { font-size: 19px; margin-bottom: 8px; }
.product-card-body p { font-size: 14px; color: var(--c-soft); line-height: 1.8; flex: 1; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 22px; }
.chip {
  font-size: 12px; color: var(--c-steel); background: var(--c-steel-08);
  padding: 4px 12px; border-radius: 3px; letter-spacing: .04em; white-space: nowrap;
}
.card-link { font-size: 14px; font-weight: 600; color: var(--c-red); display: inline-flex; align-items: center; gap: 6px; }
.card-link .arr { transition: transform .18s ease; }
.card-link:hover .arr { transform: translateX(4px); }

/* ---- 特点块 ---- */
.feature-grid { display: grid; gap: 24px; }
.feature-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.feature-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.feature-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.feature-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 30px 28px; transition: border-color .2s ease, box-shadow .2s ease;
}
.feature-item:hover { border-color: var(--c-steel-15); box-shadow: var(--shadow); }
.feature-item .no {
  font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: var(--c-red);
  letter-spacing: .1em; margin-bottom: 14px; display: block;
}
.feature-item h3 { font-size: 17px; margin-bottom: 10px; }
.feature-item p { font-size: 14px; color: var(--c-soft); line-height: 1.85; }

/* ---- 参数表 ---- */
.spec-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff; }
.spec-table { width: 100%; border-collapse: collapse; min-width: 480px; }
.spec-table th, .spec-table td { padding: 14px 22px; font-size: 14px; text-align: left; border-bottom: 1px solid var(--c-line); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th { color: var(--c-soft); font-weight: 500; white-space: nowrap; width: 200px; background: var(--c-mist); }
.spec-table td { color: var(--c-ink); font-weight: 500; }
.spec-table td.num { font-family: var(--font-mono); }

/* ---- 配件卡片 ---- */
.acc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.acc-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 24px 20px 20px; text-align: center;
  transition: transform .2s ease, box-shadow .2s ease;
}
.acc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.acc-visual { height: 150px; display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.acc-visual img { max-height: 100%; max-width: 100%; object-fit: contain; }
.acc-card h4 { font-size: 15px; }
.acc-card .spec { font-size: 12px; color: var(--c-soft); margin-top: 6px; font-family: var(--font-mono); letter-spacing: .02em; }
.acc-group-title { font-size: 20px; margin: 56px 0 8px; }
.acc-group-sub { font-size: 14px; color: var(--c-soft); margin-bottom: 26px; }

/* ---- 返回顶部 ---- */
.to-top {
  position: fixed; right: 28px; bottom: 96px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--c-ink); color: #fff; display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: .22s ease; box-shadow: var(--shadow);
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--c-red); }
.to-top svg { width: 18px; height: 18px; }

/* ---- 移动底部操作条 ---- */
.mobile-cta {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 95;
  background: #fff; border-top: 1px solid var(--c-line);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  gap: 10px;
}
.mobile-cta a, .mobile-cta button {
  flex: 1; height: 46px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 15px; font-weight: 600;
}
.mobile-cta .call { background: var(--c-red); color: #fff; }
.mobile-cta .ask { background: var(--c-ink); color: #fff; }
.mobile-cta svg { width: 16px; height: 16px; }

/* ---- 滚动显现（仅 JS 可用时隐藏，no-JS 直接可见） ---- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.in { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: .1s; } .reveal-d2 { transition-delay: .2s; } .reveal-d3 { transition-delay: .3s; }

/* ==========================================================================
   首页
   ========================================================================== */
.hero { position: relative; overflow: hidden; background: linear-gradient(180deg, #FBFCFD 0%, var(--c-mist) 100%); }
.hero-in { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); align-items: center; gap: 48px; padding: 90px 0 100px; }
.hero-copy .company { font-size: 15px; font-weight: 600; color: var(--c-steel); letter-spacing: .14em; margin-bottom: 22px; }
.hero-copy h1 { font-size: clamp(36px, 4.8vw, 58px); line-height: 1.22; letter-spacing: .01em; }
.hero-copy .lede { font-size: 17px; max-width: 520px; }
.hero-est {
  display: inline-flex; align-items: center; gap: 12px; margin: 30px 0 38px;
  font-size: 14px; font-weight: 600; color: var(--c-ink); letter-spacing: .08em;
  padding: 9px 18px; background: #fff; border: 1px solid var(--c-line); border-radius: 100px;
}
.hero-est .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-red); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { position: relative; min-height: 480px; display: flex; align-items: flex-end; justify-content: flex-end; padding-right: 8px; }
.hero-visual .device-back { width: 74%; margin-right: -4%; filter: drop-shadow(0 24px 40px rgba(38,59,80,.18)); }
.hero-visual .device-front {
  position: absolute; left: 0; bottom: 0; width: 56%;
  filter: drop-shadow(0 18px 32px rgba(38,59,80,.24));
  z-index: 2;
}
.hero-visual .halo {
  position: absolute; inset: 6% 0 0; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(66,87,102,.10), transparent);
  z-index: -1;
}
.hero-visual .badge {
  position: absolute; z-index: 3;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; font-weight: 700;
  color: var(--c-steel); background: #fff; border: 1px solid var(--c-line);
  padding: 7px 14px; border-radius: 3px; box-shadow: 0 4px 14px rgba(38,59,80,.08);
  white-space: nowrap;
}
.hero-visual .badge--back { top: 6%; right: 2%; }
.hero-visual .badge--front { top: 6%; left: 0; }

/* 品牌带 */
.trust-band { background: var(--c-ink); color: #fff; }
.trust-band-in { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-cell { padding: 44px 40px; border-left: 1px solid rgba(255,255,255,.12); }
.trust-cell:first-child { border-left: 0; }
.trust-cell .k { font-family: var(--font-mono); font-size: 30px; font-weight: 700; letter-spacing: .02em; color: #fff; }
.trust-cell .k em { font-style: normal; color: var(--c-red); }
.trust-cell .d { font-size: 13px; color: rgba(255,255,255,.6); margin-top: 8px; line-height: 1.7; }

/* 关于预览 */
.about-preview { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); gap: 72px; align-items: center; }
.about-preview-body p { margin-bottom: 18px; font-size: 15px; color: var(--c-soft); line-height: 2; }
.about-preview-body p strong { color: var(--c-ink); font-weight: 600; }
.about-fields { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0 34px; }
.about-fields .chip { font-size: 13px; padding: 6px 14px; }
.about-visual {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: var(--c-mist); border: 1px solid var(--c-line);
  aspect-ratio: 4 / 3.4; display: flex; align-items: center; justify-content: center; padding: 40px;
}
.about-visual img { max-width: 82%; max-height: 82%; object-fit: contain; filter: drop-shadow(0 20px 36px rgba(38,59,80,.16)); }
.about-visual .model-tag {
  position: absolute; top: 18px; left: 20px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em;
  font-weight: 700; color: var(--c-steel); background: #fff; border: 1px solid var(--c-line); padding: 4px 10px; border-radius: 3px;
}

/* 应用领域 */
.field-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.field-grid--3 { grid-template-columns: repeat(3, 1fr); }
.field-cell {
  border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff;
  padding: 26px 10px; text-align: center; font-size: 15px; font-weight: 600; color: var(--c-ink);
  transition: border-color .2s, box-shadow .2s;
}
.field-cell:hover { border-color: var(--c-red); box-shadow: var(--shadow); color: var(--c-red); }

/* CTA */
.cta-band { position: relative; background: var(--c-ink); overflow: hidden; }
.cta-band::after {
  content: ""; position: absolute; right: -140px; top: -140px; width: 460px; height: 460px; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(217,45,40,.22), transparent 70%);
}
.cta-in { position: relative; z-index: 1; padding: 96px 0; text-align: center; }
.cta-in h2 { color: #fff; font-size: clamp(28px, 3.4vw, 42px); }
.cta-in p { color: rgba(255,255,255,.66); margin: 18px 0 36px; font-size: 16px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-tel { display: inline-flex; align-items: center; gap: 10px; color: #fff; font-size: 15px; font-weight: 600; letter-spacing: .06em; margin-top: 26px; }
.cta-tel .num { font-family: var(--font-mono); font-size: 24px; color: var(--c-red); background: #fff; padding: 4px 14px; border-radius: 4px; }
.cta-tel:hover .num { text-decoration: underline; }

/* ==========================================================================
   内页 Hero
   ========================================================================== */
.page-hero { background: var(--c-mist); border-bottom: 1px solid var(--c-line); position: relative; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; right: -80px; bottom: -160px; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(66,87,102,.12), transparent 70%);
}
.page-hero-in { position: relative; padding: 72px 0 64px; }
.page-hero h1 { font-size: clamp(30px, 3.8vw, 44px); margin-top: 16px; }
.page-hero .h-sub { max-width: 640px; }

/* 产品详情 Hero */
.product-hero { background: linear-gradient(180deg, #FBFCFD, var(--c-mist)); border-bottom: 1px solid var(--c-line); }
.product-hero-in {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); align-items: center;
  gap: 56px; padding: 72px 0 84px;
}
.product-hero-model {
  font-family: var(--font-mono); font-size: clamp(40px, 5vw, 64px); font-weight: 700;
  color: transparent; -webkit-text-stroke: 1.5px var(--c-steel); letter-spacing: .04em; line-height: 1;
}
.product-hero-copy h1 { font-size: clamp(28px, 3.4vw, 40px); margin: 18px 0 6px; }
.product-hero-tagline { font-size: 16px; color: var(--c-red); font-weight: 600; letter-spacing: .04em; }
.product-hero-desc { font-size: 15px; color: var(--c-soft); margin-top: 20px; line-height: 2; max-width: 480px; }
.product-hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.product-hero-visual {
  position: relative; min-height: 430px; display: flex; align-items: center; justify-content: center;
  padding: 30px;
}
.product-hero-visual img { max-height: 400px; width: auto; max-width: 100%; object-fit: contain; filter: drop-shadow(0 28px 48px rgba(38,59,80,.18)); }
.product-hero-visual .halo {
  position: absolute; inset: 8% 10%; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(66,87,102,.10), transparent); z-index: 0;
}
.product-hero-visual img { position: relative; z-index: 1; }

/* 详情页双栏块 */
.detail-split { display: grid; grid-template-columns: minmax(0,.9fr) minmax(0,1.4fr); gap: 64px; align-items: start; }
.detail-sticky { position: sticky; top: 110px; }
.detail-visual {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center; padding: 44px; min-height: 380px;
}
.detail-visual img { max-width: 100%; max-height: 340px; object-fit: contain; filter: drop-shadow(0 16px 30px rgba(38,59,80,.14)); }
.detail-aside-cta { margin-top: 22px; display: grid; gap: 12px; }
.detail-aside-cta .btn { width: 100%; }

/* 快速参数摘要 */
.spec-brief { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 24px; }
.spec-brief .cell { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 14px 18px; }
.spec-brief .k { font-size: 12px; color: var(--c-soft); letter-spacing: .06em; }
.spec-brief .v { font-size: 15px; font-weight: 700; color: var(--c-ink); margin-top: 3px; font-family: var(--font-mono); }

/* 转子展示 */
.rotor-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.rotor-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 28px; text-align: center; transition: transform .2s, box-shadow .2s; }
.rotor-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.rotor-card .visual { height: 190px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.rotor-card .visual img { max-height: 100%; object-fit: contain; }
.rotor-card .no { font-family: var(--font-mono); font-size: 12px; font-weight: 700; letter-spacing: .16em; color: var(--c-red); display: block; margin-bottom: 8px; }
.rotor-card h4 { font-size: 16px; }
.rotor-card p { font-size: 13px; color: var(--c-soft); margin-top: 8px; line-height: 1.8; }

/* 相关产品 */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 64px; align-items: start; }
.contact-list { display: grid; gap: 14px; margin-top: 8px; }
.contact-item {
  display: flex; gap: 18px; align-items: flex-start; background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius); padding: 22px 24px; transition: border-color .2s, box-shadow .2s;
}
.contact-item:hover { border-color: var(--c-steel-15); box-shadow: var(--shadow); }
.contact-item svg { width: 20px; height: 20px; color: var(--c-red); flex-shrink: 0; margin-top: 4px; }
.contact-item .k { font-size: 13px; color: var(--c-soft); letter-spacing: .08em; margin-bottom: 4px; }
.contact-item .v { font-size: 16px; font-weight: 600; color: var(--c-ink); line-height: 1.6; word-break: break-all; }
.contact-item .v.num { font-family: var(--font-mono); }
.contact-item a.v:hover { color: var(--c-red); }
.contact-note { font-size: 13px; color: var(--c-soft); margin-top: 20px; line-height: 1.9; padding: 16px 18px; background: var(--c-steel-08); border-radius: var(--radius); }

/* 表单 */
.form-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13px; font-weight: 600; color: var(--c-ink); letter-spacing: .04em; }
.form-field label .req { color: var(--c-red); margin-left: 2px; }
.form-field input, .form-field select, .form-field textarea {
  font: inherit; font-size: 14px; color: var(--c-ink); background: var(--c-mist);
  border: 1px solid var(--c-line); border-radius: var(--radius); padding: 12px 14px;
  transition: border-color .15s, background .15s;
}
.form-field textarea { resize: vertical; min-height: 110px; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--c-steel); background: #fff;
}
.form-foot { display: flex; align-items: center; gap: 18px; margin-top: 24px; flex-wrap: wrap; }
.form-foot .hint { font-size: 12px; color: var(--c-soft); }

/* 地图占位 */
.map-box { margin-top: 26px; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: var(--c-mist); }
.map-box img { width: 100%; display: block; }
.map-note { font-size: 13px; color: var(--c-soft); padding: 14px 18px; background: #fff; border-top: 1px solid var(--c-line); }
.map-static { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; padding: 44px 24px; text-align: center; }
.map-static svg { width: 40px; height: 40px; margin-bottom: 8px; }
.map-static .addr { font-size: 17px; font-weight: 700; color: var(--c-ink); letter-spacing: .02em; }
.map-static .addr-sub { font-size: 13px; color: var(--c-soft); }

/* ---- 微信二维码 ---- */
.wechat-pop { position: relative; }
.wechat-pop .qr-float {
  position: absolute; right: 0; top: calc(100% + 14px); z-index: 110;
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 16px; width: 190px; text-align: center;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.wechat-pop:hover .qr-float, .wechat-pop:focus-within .qr-float { opacity: 1; visibility: visible; transform: translateY(0); }
.qr-float img { width: 156px; height: 156px; object-fit: contain; border-radius: 4px; margin: 0 auto; }
.qr-float p { font-size: 12px; color: var(--c-soft); margin-top: 10px; }
.topbar-wechat {
  display: inline-flex; align-items: center; gap: 7px; flex-shrink: 0;
  height: 40px; padding: 0 14px; border: 1px solid var(--c-line); border-radius: var(--radius);
  font-size: 14px; font-weight: 600; color: var(--c-ink); background: #fff; letter-spacing: .02em;
  transition: border-color .15s ease, color .15s ease;
}
.topbar-wechat:hover { border-color: var(--c-steel); color: var(--c-red); }
.topbar-wechat svg { width: 17px; height: 17px; color: #07C160; }
.footer-qr { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); display: flex; align-items: center; gap: 16px; }
.footer-qr img { width: 92px; height: 92px; border-radius: 6px; background: #fff; padding: 5px; flex-shrink: 0; }
.footer-qr .txt { font-size: 13px; color: rgba(255,255,255,.6); line-height: 1.8; }
.footer-qr .txt strong { color: #fff; font-size: 14px; display: block; letter-spacing: .04em; }

/* 微信弹层（移动端） */
.wx-overlay {
  position: fixed; inset: 0; z-index: 200; background: rgba(38,59,80,.72);
  display: flex; align-items: center; justify-content: center; padding: 32px;
  opacity: 0; visibility: hidden; transition: opacity .2s ease, visibility .2s;
}
.wx-overlay.show { opacity: 1; visibility: visible; }
.wx-dialog {
  background: #fff; border-radius: 10px; padding: 30px 28px; max-width: 320px; width: 100%;
  text-align: center; transform: translateY(14px); transition: transform .2s ease;
  display: flex; flex-direction: column; align-items: center;
}
.wx-overlay.show .wx-dialog { transform: translateY(0); }
.wx-dialog img { width: 220px; height: 220px; object-fit: contain; border-radius: 6px; margin: 0 auto; }
.wx-dialog h4 { font-size: 17px; margin: 16px 0 6px; }
.wx-dialog p { font-size: 13px; color: var(--c-soft); line-height: 1.8; }
.wx-dialog .wx-close {
  margin-top: 18px; height: 42px; width: 100%; border-radius: var(--radius);
  background: var(--c-mist); color: var(--c-ink); font-size: 14px; font-weight: 600;
}
.wx-dialog .wx-close:hover { background: var(--c-steel-08); }
.mobile-cta .wx-btn { background: #07C160; color: #fff; border: 0; font: inherit; cursor: pointer; }

/* 联系页大二维码卡片 */
.qr-card {
  margin-top: 14px; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  display: flex; align-items: center; gap: 22px; padding: 22px 26px;
  transition: border-color .2s, box-shadow .2s;
}
.qr-card:hover { border-color: var(--c-steel-15); box-shadow: var(--shadow); }
.qr-card img { width: 116px; height: 116px; object-fit: contain; flex-shrink: 0; }
.qr-card .wx-icon { width: 34px; height: 34px; color: #07C160; flex-shrink: 0; }
.qr-card .txt h4 { font-size: 16px; display: flex; align-items: center; gap: 8px; }
.qr-card .txt p { font-size: 13px; color: var(--c-soft); margin-top: 6px; line-height: 1.8; }

@media (max-width: 960px) {
  .topbar-wechat { display: none; }
}
@media (max-width: 640px) {
  .qr-card { flex-direction: column; text-align: center; gap: 14px; }
  .footer-qr img { width: 110px; height: 110px; }
}

/* 相关搜索区块 */
.related-search { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 32px 36px; }
.related-search p { font-size: 15px; line-height: 2.1; color: var(--c-text); }
.related-search strong { color: var(--c-ink); font-weight: 600; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .trust-band-in { grid-template-columns: 1fr 1fr; }
  .trust-cell:nth-child(odd) { border-left: 0; }
  .trust-cell { border-top: 1px solid rgba(255,255,255,.12); }
  .trust-cell:nth-child(-n+2) { border-top: 0; }
  .field-grid { grid-template-columns: repeat(3, 1fr); }
  .acc-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 960px) {
  .nav, .topbar-tel { display: none; }
  .nav-toggle { display: block; }
  .topbar-in { height: 64px; }
  .logo-link img { height: 38px; width: auto; }
  .logo-brand { margin-left: 10px; }
  .logo-brand .cn { font-size: 17px; }
  .logo-brand .en { font-size: 8px; }
  .m-nav {
    display: block; position: fixed; top: 64px; left: 0; right: 0; z-index: 99; background: #fff;
    padding: 12px 24px 20px; overflow-y: auto; max-height: calc(100vh - 64px);
    box-shadow: 0 24px 40px rgba(38,59,80,.14);
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: .22s ease;
  }
  .nav-open .m-nav { transform: none; opacity: 1; visibility: visible; }
  .m-nav > li { border-bottom: 1px solid var(--c-line); }
  .m-nav > li > a, .m-nav .m-group-label { display: block; padding: 16px 4px; font-size: 16px; font-weight: 600; color: var(--c-ink); }
  .m-nav .m-group-label { display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
  .m-nav .m-group-label .plus { transition: transform .2s; color: var(--c-soft); font-weight: 400; font-size: 20px; }
  .m-group.open .m-group-label .plus { transform: rotate(45deg); }
  .m-sub { display: none; padding: 0 4px 14px; }
  .m-group.open .m-sub { display: block; }
  .m-sub a { display: block; padding: 11px 14px; font-size: 14px; color: var(--c-text); border-left: 2px solid var(--c-line); }
  .m-sub a:hover { color: var(--c-red); border-left-color: var(--c-red); }
  .m-sub .tag { color: var(--c-soft); font-size: 12px; margin-left: 8px; }
  .m-nav .m-tel { margin-top: 18px; }
  .m-nav .m-tel a {
    display: flex; align-items: center; justify-content: center; gap: 8px; height: 50px;
    background: var(--c-red); color: #fff; border-radius: var(--radius); font-size: 16px; font-weight: 700; letter-spacing: .04em;
  }
  .mobile-cta { z-index: 96; }

  .hero-in { grid-template-columns: 1fr; padding: 64px 0 72px; gap: 28px; }
  .hero-copy .lede { max-width: none; }
  .hero-visual { min-height: 360px; order: -1; padding-bottom: 30px; margin-bottom: 30px; }
  .hero-visual .device-back { width: 78%; margin-right: 0; }
  .hero-visual .device-front { width: 58%; left: -2%; }
  .hero-visual .badge { display: none; }
  .product-hero-in { grid-template-columns: 1fr; padding: 48px 0 60px; gap: 12px; }
  .product-hero-visual { min-height: 300px; order: -1; padding: 12px; }
  .product-hero-visual img { max-height: 280px; }
  .detail-split { grid-template-columns: 1fr; gap: 40px; }
  .detail-sticky { position: static; }
  .about-preview { grid-template-columns: 1fr; gap: 44px; }
  .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .section { padding: 72px 0; }
  .product-grid, .related-grid, .rotor-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .feature-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .wrap, .wrap-narrow { padding: 0 20px; }
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 40px; }
  .product-grid, .related-grid, .rotor-grid { grid-template-columns: 1fr; }
  .feature-grid.cols-4, .feature-grid.cols-3, .feature-grid.cols-2 { grid-template-columns: 1fr; }
  .field-grid { grid-template-columns: repeat(2, 1fr); }
  .acc-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding-bottom: 44px; }
  .footer { padding-top: 56px; }
  .footer-bottom { flex-direction: column; gap: 6px; }
  .form-card { padding: 26px 22px; }
  .form-grid { grid-template-columns: 1fr; }
  .trust-band-in { grid-template-columns: 1fr 1fr; }
  .trust-cell { padding: 30px 24px; }
  .trust-cell .k { font-size: 24px; }
  .mobile-cta { display: flex; }
  .cta-in { padding-top: 116px; }
  .hero-in { padding-top: 36px; padding-bottom: 24px; }
  .hero-visual { min-height: 300px; padding-bottom: 30px; margin-bottom: 30px; }
  .product-hero-in { padding-top: 36px; }
  .product-hero-visual { min-height: 280px; padding-top: 20px; }
  .to-top { bottom: 82px; right: 18px; }
  .product-card-visual { height: 230px; padding: 24px; }
  .hero-est { margin: 24px 0 30px; }
  .hero-actions .btn, .product-hero-actions .btn, .cta-actions .btn { width: 100%; }
  .cta-actions .btn { justify-content: center; }
  .spec-table th { width: 130px; padding: 12px 16px; }
  .spec-table td { padding: 12px 16px; }
}

/* ==========================================================================
   体验与视觉增强（2026-09 打磨）
   ========================================================================== */

/* 选区色 */
::selection { background: var(--c-red); color: #fff; }

/* 防横向滚动 */
html, body { overflow-x: clip; }

/* 无障碍跳转链接 */
.skip-link {
  position: fixed; top: -60px; left: 16px; z-index: 200;
  background: var(--c-ink); color: #fff; font-size: 14px; font-weight: 600;
  padding: 10px 18px; border-radius: var(--radius);
  transition: top .2s ease;
}
.skip-link:focus-visible { top: 12px; outline-color: #fff; }

/* 顶栏滚动阴影 */
.topbar { transition: box-shadow .25s ease, background .25s ease; }
.topbar.is-scrolled { box-shadow: 0 6px 24px rgba(38, 59, 80, .09); }

/* Hero 工程网格纹理 */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--c-steel-08) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-steel-08) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 80% at 70% 20%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 70% 20%, #000 0%, transparent 70%);
}
.hero-in { position: relative; z-index: 1; }

/* 页脚链接下划线滑动 */
.footer-links a { position: relative; display: inline-block; padding-bottom: 2px; }
.footer-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: currentColor; transform: scaleX(0); transform-origin: left;
  transition: transform .22s ease;
}
.footer-links a:hover::after { transform: scaleX(1); }

/* 特性卡片顶部强调线 */
.feature-item { position: relative; overflow: hidden; }
.feature-item::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--c-red); transform: scaleX(0); transform-origin: left;
  transition: transform .3s ease;
}
.feature-item:hover::before { transform: scaleX(1); }

/* ---- 常见问题 FAQ ---- */
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.faq-item:hover { border-color: var(--c-steel-15); }
.faq-item[open] { border-color: var(--c-steel-15); box-shadow: var(--shadow); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--c-ink);
  cursor: pointer; list-style: none; -webkit-tap-highlight-color: transparent;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-ic { position: relative; width: 16px; height: 16px; flex-shrink: 0; }
.faq-ic::before, .faq-ic::after {
  content: ""; position: absolute; background: var(--c-red); transition: transform .22s ease;
}
.faq-ic::before { left: 0; top: 7px; width: 16px; height: 2px; }
.faq-ic::after { left: 7px; top: 0; width: 2px; height: 16px; }
.faq-item[open] .faq-ic::after { transform: rotate(90deg); }
.faq-a { padding: 0 24px 22px; }
.faq-a p { font-size: 14px; color: var(--c-soft); line-height: 2; }

/* ---- 选型对比（compare.html） ---- */
.cmp-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff; }
.cmp-table { width: 100%; border-collapse: collapse; min-width: 780px; }
.cmp-table th, .cmp-table td { padding: 14px 18px; font-size: 14px; text-align: left; border-bottom: 1px solid var(--c-line); vertical-align: top; }
.cmp-table tr:last-child th, .cmp-table tr:last-child td { border-bottom: 0; }
.cmp-table thead th { background: var(--c-mist); color: var(--c-ink); font-weight: 600; white-space: nowrap; }
.cmp-table thead th:first-child { width: 132px; }
.cmp-table tbody th { color: var(--c-soft); font-weight: 500; white-space: nowrap; background: #fff; }
.cmp-table td { color: var(--c-ink); font-weight: 500; }
.cmp-table td.na { color: var(--c-soft); font-weight: 400; }
.cmp-table .model { display: block; font-size: 12px; letter-spacing: .06em; color: var(--c-soft); font-weight: 400; margin-bottom: 2px; }
.cmp-scroll-hint { display: none; font-size: 12px; color: var(--c-soft); margin-top: 8px; }

.pick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pick-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 26px 24px; }
.pick-card .badge { display: inline-block; font-size: 12px; letter-spacing: .06em; color: var(--c-red); font-weight: 600; margin-bottom: 10px; }
.pick-card h3 { font-size: 18px; color: var(--c-ink); margin-bottom: 10px; }
.pick-card p { font-size: 14px; color: var(--c-soft); line-height: 1.9; }
.pick-card .when { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--c-line); font-size: 13px; color: var(--c-ink); }
.pick-card .when b { color: var(--c-red); font-weight: 600; }

.scene-list { display: grid; gap: 14px; }
.scene-item { display: grid; grid-template-columns: 220px 1fr; gap: 18px; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 20px 24px; }
.scene-item .q { font-weight: 600; color: var(--c-ink); font-size: 15px; }
.scene-item .a { font-size: 14px; color: var(--c-soft); line-height: 1.95; }
.scene-item .a b { color: var(--c-ink); font-weight: 600; }

.note-box { margin-top: 28px; padding: 18px 22px; border-left: 3px solid var(--c-red); background: var(--c-mist); border-radius: 0 var(--radius) var(--radius) 0; font-size: 13px; color: var(--c-soft); line-height: 1.9; }

@media (max-width: 980px) {
  .pick-grid { grid-template-columns: 1fr; }
  .scene-item { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 640px) {
  .cmp-table th, .cmp-table td { padding: 12px 14px; font-size: 13px; }
  .cmp-scroll-hint { display: block; }
  .faq-item summary { padding: 17px 18px; font-size: 15px; }
  .faq-a { padding: 0 18px 18px; }
  .m-nav { padding-bottom: calc(32px + env(safe-area-inset-bottom)); }
}