/* ==========================================================================
   宏泰隆线缆 · MI 矿物绝缘电缆 官网样式
   色调：深蓝 / 深灰 / 金属银   风格：B端重工 · 简洁高级
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  /* 深蓝 */
  --navy-900: #061524;
  --navy-800: #0a1f33;
  --navy-700: #0e2a44;
  --navy-600: #143657;
  --navy-500: #1c4570;
  --navy-400: #2e6fb7;
  /* 深灰 */
  --steel-900: #10161d;
  --steel-800: #1b232e;
  --steel-700: #28323f;
  --grey-600: #4d5a68;
  --grey-500: #6b7887;
  --grey-400: #93a0ae;
  /* 金属银 */
  --silver-400: #aab5c1;
  --silver-300: #c4ced9;
  --silver-200: #dde4ea;
  --silver-100: #eef2f6;
  --silver-50: #f6f8fa;
  --white: #ffffff;

  --line: #e3e8ee;
  --line-dark: rgba(255, 255, 255, 0.14);

  --metal: linear-gradient(118deg, #f2f6f9 0%, #b9c4d0 26%, #ffffff 46%, #9aa7b6 66%, #dde5ec 100%);
  --metal-line: linear-gradient(90deg, transparent, #b9c4d0 20%, #f2f6f9 50%, #b9c4d0 80%, transparent);

  --ff-zh: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --ff-en: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --ff: var(--ff-en), var(--ff-zh);

  --shadow-xs: 0 1px 2px rgba(10, 31, 51, 0.06);
  --shadow-sm: 0 2px 8px rgba(10, 31, 51, 0.07);
  --shadow-md: 0 14px 34px -14px rgba(10, 31, 51, 0.28);
  --shadow-lg: 0 30px 70px -30px rgba(6, 21, 36, 0.55);

  --r-sm: 3px;
  --r-md: 5px;
  --r-lg: 8px;

  --header-h: 76px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. 基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

/* ⚠️ 别删。hidden 属性的 display:none 来自浏览器默认样式（UA 样式表），
   任何作者样式里的 display 都会压过它 —— 跟选择器优先级无关。
   本站 admin/inbox.html 就踩过：.gate 写了 display:flex，
   于是 gateEl.hidden = true 完全无效，口令校验明明通过了，
   那扇门却一直盖在页面上，表现就是「点了没反应」。
   这条复位让 hidden 永远说了算。 */
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  /* 放在 html 上（而非 body）以免破坏 header 的 position: sticky */
  overflow-x: hidden;
}
html.no-scroll { overflow: hidden; }

body {
  margin: 0;
  font-family: var(--ff);
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel-800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }

::selection { background: var(--navy-800); color: #fff; }

:focus-visible {
  outline: 2px solid var(--navy-400);
  outline-offset: 3px;
}

/* ---------- 3. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}

.sec { padding: 108px 0; position: relative; }
.sec--tight { padding: 86px 0; }
.sec--dark { background: var(--navy-900); color: #fff; }
/* 灰底做成有对比度的银灰，并加上下分隔线，避免中段整片发白 */
.sec--grey {
  background: var(--silver-100);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.sec--steel { background: var(--steel-900); color: #fff; }

/* 白色区块底部一条金属渐变细线，弱化「一大片空白」的观感 */
.sec:not(.sec--grey):not(.sec--dark):not(.sec--steel)::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: min(1240px, calc(100% - 56px));
  height: 1px;
  transform: translateX(-50%);
  background: var(--metal-line);
  opacity: 0.75;
}

.sec-head { max-width: 780px; margin-bottom: 56px; }
.sec-head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* 区块小标 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--ff-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy-400);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--navy-400);
  opacity: 0.7;
}
.sec--dark .eyebrow,
.sec--steel .eyebrow { color: var(--silver-300); }
.sec--dark .eyebrow::before,
.sec--steel .eyebrow::before { background: var(--silver-300); }

.h-sec {
  font-size: 38px;
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--navy-900);
}
.sec--dark .h-sec,
.sec--steel .h-sec { color: #fff; }

.h-sec em {
  font-style: normal;
  background: var(--metal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.sec-sub {
  margin-top: 18px;
  font-size: 16.5px;
  color: var(--grey-600);
  line-height: 1.8;
}
.sec--dark .sec-sub,
.sec--steel .sec-sub { color: rgba(255, 255, 255, 0.7); }
.sec-sub--en { font-family: var(--ff-en); font-size: 15.5px; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--r-sm);
  transition: all 0.28s var(--ease);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn svg { width: 16px; height: 16px; flex: none; }

.btn--primary {
  background: var(--navy-800);
  color: #fff;
  box-shadow: 0 10px 26px -12px rgba(10, 31, 51, 0.7);
}
.btn--primary:hover {
  background: var(--navy-600);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -14px rgba(10, 31, 51, 0.75);
}

.btn--ghost {
  border: 1px solid var(--line-dark);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.btn--line {
  border: 1px solid var(--silver-300);
  color: var(--navy-800);
  background: #fff;
}
.btn--line:hover {
  border-color: var(--navy-800);
  background: var(--silver-50);
  transform: translateY(-2px);
}

.btn--metal {
  background: var(--metal);
  color: var(--navy-900);
  box-shadow: var(--shadow-md);
}
.btn--metal:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.btn--sm { padding: 12px 22px; font-size: 14px; }
/* WhatsApp 通道：用品牌绿，让客户一眼认出 */
.btn--wa {
  background: #1eab5a;
  color: #fff;
  box-shadow: 0 10px 26px -12px rgba(30, 171, 90, 0.65);
}
.btn--wa:hover {
  background: #199a50;
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -14px rgba(30, 171, 90, 0.7);
}

/* 文字箭头链接 */
.tlink {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--navy-400);
  transition: gap 0.25s var(--ease);
}
.tlink:hover { gap: 13px; }
.tlink svg { width: 15px; height: 15px; }

/* ---------- 5. 顶部信息条 ---------- */
.topbar {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.topbar__in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 40px;
}
.topbar__list { display: flex; align-items: center; gap: 26px; }
.topbar__list li { display: flex; align-items: center; gap: 8px; }
.topbar__list svg { width: 14px; height: 14px; color: var(--silver-400); flex: none; }
.topbar__list a:hover { color: #fff; }
.topbar__tag {
  display: flex;
  align-items: center;
  gap: 9px;
  letter-spacing: 0.06em;
  font-family: var(--ff-en);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--silver-300);
}
.topbar__dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: #4ea672;
  box-shadow: 0 0 0 3px rgba(78, 166, 114, 0.18);
}

/* ---------- 6. 头部导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}
.header.is-stuck { box-shadow: 0 8px 26px -18px rgba(10, 31, 51, 0.6); }

.header__in {
  display: flex;
  align-items: center;
  gap: 26px;
  height: var(--header-h);
}

/* LOGO */
.logo { display: flex; align-items: center; gap: 12px; flex: none; }
.logo__mark { width: 40px; height: 40px; flex: none; color: var(--navy-900); }
.footer .logo__mark { color: #ffffff; }
.logo__txt { display: flex; flex-direction: column; line-height: 1.15; }
.logo__zh {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--navy-900);
}
.logo__en {
  font-family: var(--ff-en);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-top: 2px;
}

/* 主导航 */
.nav { margin-left: auto; }
.nav__list { display: flex; align-items: center; gap: 4px; }
.nav__list a {
  position: relative;
  display: block;
  padding: 10px 13px;
  font-size: 15px;
  font-weight: 500;
  color: var(--steel-700);
  transition: color 0.22s var(--ease);
  white-space: nowrap;
}
.nav__list a::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 4px;
  height: 2px;
  background: var(--navy-800);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav__list a:hover { color: var(--navy-900); }
.nav__list a:hover::after,
.nav__list a.is-active::after { transform: scaleX(1); }
.nav__list a.is-active { color: var(--navy-900); font-weight: 600; }

.header__act { display: flex; align-items: center; gap: 14px; flex: none; }

/* 语言切换 */
.lang {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--silver-200);
  border-radius: 999px;
  background: var(--silver-50);
  position: relative;
}
.lang__btn {
  padding: 6px 14px;
  font-family: var(--ff-en);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: 999px;
  color: var(--grey-500);
  transition: all 0.25s var(--ease);
}
.lang__btn.is-on {
  background: var(--navy-800);
  color: #fff;
  box-shadow: var(--shadow-xs);
}

/* 汉堡 */
.burger {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--silver-200);
  border-radius: var(--r-sm);
  position: relative;
  flex: none;
}
.burger span {
  position: absolute;
  left: 11px; right: 11px;
  height: 1.6px;
  background: var(--navy-900);
  transition: all 0.3s var(--ease);
}
.burger span:nth-child(1) { top: 14px; }
.burger span:nth-child(2) { top: 20px; }
.burger span:nth-child(3) { top: 26px; }
body.nav-open .burger span:nth-child(1) { top: 20px; transform: rotate(45deg); }
body.nav-open .burger span:nth-child(2) { opacity: 0; }
body.nav-open .burger span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

/* 抽屉 */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 190;
  background: var(--navy-900);
  padding: 100px 28px 40px;
  overflow-y: auto;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.42s var(--ease), visibility 0s linear 0.42s;
}
body.nav-open .drawer {
  transform: translateX(0);
  visibility: visible;
  transition: transform 0.42s var(--ease), visibility 0s;
}
.drawer__list { border-top: 1px solid var(--line-dark); }
.drawer__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 4px;
  font-size: 19px;
  font-weight: 600;
  color: #fff;
  border-bottom: 1px solid var(--line-dark);
}
.drawer__list span {
  font-family: var(--ff-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--silver-400);
}
.drawer__foot { margin-top: 34px; display: grid; gap: 14px; }
.drawer__meta {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  color: rgba(255, 255, 255, 0.6);
  font-size: 13.5px;
  line-height: 2;
}
.drawer__meta a { color: rgba(255, 255, 255, 0.86); }

/* ---------- 7. 首屏 ---------- */
.hero {
  position: relative;
  min-height: min(88vh, 780px);
  display: flex;
  align-items: center;
  background: var(--navy-900);
  overflow: hidden;
  padding: 104px 0 132px;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url("../img/hero-bg.jpg");
  background-size: cover;
  background-position: center 42%;
}
.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(6, 21, 36, 0.96) 0%, rgba(6, 21, 36, 0.88) 34%, rgba(6, 21, 36, 0.55) 62%, rgba(6, 21, 36, 0.42) 100%),
    linear-gradient(180deg, rgba(6, 21, 36, 0.7) 0%, transparent 32%, rgba(6, 21, 36, 0.85) 100%);
}
/* 蓝图网格 */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: radial-gradient(ellipse at 72% 50%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at 72% 50%, #000 0%, transparent 72%);
  pointer-events: none;
}

/* 头图文字栏。这里有两个 max-width，分工不同，不要合并写：
     · 外层 .hero__in 要跟着 .wrap 一起居中（上限 1240）—— 这层负责「限位」。
       曾经这里写的是 margin-left: 0 / margin-right: auto，把 .wrap 的自动居中
       抵消掉了，于是宽屏下文字只吃到 28px 内边距就贴到屏幕最左边，
       和页头 logo、下方统计条、其它内容区块（都居中在 1240 栅格内）错了 340px。
     · 内层用 880 限制正文行宽，只影响一行多长，不参与定位。 */
.hero__in { position: relative; z-index: 2; }
.hero__in > * { max-width: 880px; }

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--silver-200);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(4px);
}
.chip svg { width: 13px; height: 13px; color: var(--silver-300); }

.hero h1 {
  font-size: clamp(30px, 4.1vw, 54px);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}
.hero h1 .hl {
  display: block;
  background: var(--metal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.hero__sub {
  margin-top: 26px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.76);
  max-width: 660px;
}
.hero__sub-en {
  margin-top: 12px;
  font-family: var(--ff-en);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.56);
  max-width: 660px;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero__note {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.02em;
}
.hero__note svg { width: 14px; height: 14px; }

/* 首屏数据条 */
.hero__stats {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 3;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(6, 21, 36, 0.55);
  backdrop-filter: blur(10px);
}
.hero__stats ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.hero__stats li {
  padding: 24px 26px 26px;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}
.hero__stats li:first-child { border-left: 0; padding-left: 0; }
.stat__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--ff-en);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #fff;
}
.stat__num small { font-size: 15px; font-weight: 600; color: var(--silver-300); }
.stat__lb {
  margin-top: 9px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.58);
}
.stat__lb span {
  display: block;
  font-family: var(--ff-en);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.34);
  margin-top: 2px;
}

/* ---------- 8. 产品简介 ---------- */
.ov { display: grid; grid-template-columns: 1fr 1fr; gap: 68px; align-items: stretch; }

.ov__body p {
  margin-top: 20px;
  color: var(--grey-600);
  font-size: 16px;
  line-height: 1.92;
}
.ov__body p strong { color: var(--navy-900); font-weight: 600; }
.ov__en {
  margin-top: 14px;
  font-family: var(--ff-en);
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--grey-500);
}

.ov__list { margin-top: 34px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 26px; }
.ov__list li {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  font-size: 14.5px;
  color: var(--steel-700);
  line-height: 1.6;
}
.ov__list svg { width: 17px; height: 17px; color: var(--navy-400); flex: none; margin-top: 3px; }

.ov__media {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-height: 0;
}
.ov__img { position: relative; width: 100%; margin: 0; flex: none; }
.ov__img img {
  display: block;
  width: 100%;
  /* height:auto 不可省：img 上的 height 属性会作为样式提示生效（height:900px），
     两个维度都被固定后 aspect-ratio / object-fit 会全部失效，图片被纵向拉伸。 */
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: 50% 50%;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  background: var(--navy-900);
}

.ov__card {
  position: absolute;
  left: 20px;
  bottom: 20px;
  width: 188px;
  padding: 18px 20px;
  background: rgba(6, 21, 36, 0.93);
  backdrop-filter: blur(6px);
  color: #fff;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
}
.ov__card b {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--ff-en);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}
.ov__card b small { font-size: 16px; }
.ov__card p { margin-top: 10px; font-size: 13px; color: rgba(255, 255, 255, 0.66); line-height: 1.65; }
.ov__rule { height: 1px; background: var(--metal-line); margin: 16px 0; opacity: 0.5; }

/* 关键规格面板：flex:1 吸收左右栏高度差，内部各行均分，使两栏底边始终对齐 */
.ov__specs {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  padding: 20px 24px 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-xs);
}
.ov__specs-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}
.ov__specs-head h3 {
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--navy-900);
}
.ov__specs-head .tlink { font-size: 12.5px; gap: 6px; }
.ov__specs-head .tlink svg { width: 13px; height: 13px; }
.ov__specs ul { border-top: 1px solid var(--line); flex: 1 1 auto; display: flex; flex-direction: column; }
.ov__specs li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.55;
  flex: 1 1 auto;
}
.ov__specs li:last-child { border-bottom: 0; padding-bottom: 12px; }
.ov__specs li span { flex: none; color: var(--grey-500); }
.ov__specs li b { color: var(--navy-900); font-weight: 600; text-align: right; }

/* 结构剖面图 */
.struct {
  margin-top: 76px;
  border: 1px solid var(--silver-200);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, #f7fafc 0%, #eef2f6 100%);
  box-shadow: inset 0 1px 0 #fff;
  padding: 46px 48px;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 54px;
  align-items: center;
}
.struct__fig { display: flex; justify-content: center; }
.struct__fig svg { width: 100%; max-width: 300px; height: auto; }
.struct__h {
  font-size: 21px;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 6px;
}
.struct__h + .struct__he {
  font-family: var(--ff-en);
  font-size: 13.5px;
  color: var(--grey-500);
  margin-bottom: 24px;
}
.struct__layers { display: grid; gap: 2px; border-top: 1px solid var(--line); }
.struct__layers li {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
}
.struct__layers i {
  width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid var(--silver-300);
  display: grid; place-items: center;
  font-family: var(--ff-en);
  font-size: 11px;
  font-weight: 700;
  font-style: normal;
  color: var(--navy-700);
  background: #fff;
}
.struct__layers b { font-size: 15px; font-weight: 600; color: var(--navy-900); }
.struct__layers b span {
  display: block;
  font-family: var(--ff-en);
  font-size: 12px;
  font-weight: 500;
  color: var(--grey-500);
  letter-spacing: 0.02em;
  margin-top: 2px;
}
.struct__layers em {
  font-style: normal;
  font-size: 13px;
  color: var(--grey-500);
  text-align: right;
}

/* ---------- 9. 核心优势 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }

.adv {
  position: relative;
  padding: 38px 34px 36px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: all 0.34s var(--ease);
  overflow: hidden;
}
.adv::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--navy-800);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s var(--ease);
}
.adv:hover {
  border-color: var(--silver-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.adv:hover::before { transform: scaleY(1); }

.adv__idx {
  position: absolute;
  right: 28px; top: 26px;
  font-family: var(--ff-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--silver-300);
}
.adv__ico {
  width: 52px; height: 52px;
  border-radius: var(--r-sm);
  display: grid; place-items: center;
  background: linear-gradient(160deg, var(--navy-800), var(--navy-600));
  box-shadow: 0 10px 22px -12px rgba(10, 31, 51, 0.7);
  margin-bottom: 24px;
}
.adv__ico svg { width: 25px; height: 25px; color: #fff; }
.adv h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--navy-900);
  letter-spacing: -0.005em;
}
.adv__en {
  font-family: var(--ff-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy-400);
  margin-top: 7px;
}
.adv p:not(.adv__en) {
  margin-top: 15px;
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--grey-600);
}

/* ---------- 10. 技术参数 ---------- */

/* 规格截面示意图：深色章节里的一张白色图卡，承接表格中的「芯数 / 截面」 */
.spec-fig {
  margin: 0 0 34px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-md);
}
.spec-fig img { display: block; width: 100%; height: auto; }
.spec-fig figcaption {
  padding: 15px 22px;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--steel-700);
  font-size: 13px;
  letter-spacing: 0.01em;
  text-align: center;
}

.spec { border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; background: #fff; }
.spec table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.spec thead th {
  background: var(--navy-900);
  color: #fff;
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: 0.03em;
  text-align: left;
  padding: 18px 22px;
  white-space: nowrap;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
}
.spec thead th:last-child { border-right: 0; }
.spec thead th small {
  display: block;
  font-family: var(--ff-en);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver-400);
  margin-top: 3px;
}
.spec tbody td {
  padding: 17px 22px;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.7;
  color: var(--steel-700);
}
.spec tbody td:last-child { border-right: 0; }
.spec tbody tr:last-child td { border-bottom: 0; }
.spec tbody tr:nth-child(even) td { background: var(--silver-50); }
.spec tbody tr:hover td { background: #eef3f9; }
.spec__key {
  font-weight: 600;
  color: var(--navy-900) !important;
  background: var(--silver-100) !important;
  white-space: nowrap;
}
.spec__key span {
  display: block;
  font-family: var(--ff-en);
  font-size: 11px;
  font-weight: 500;
  color: var(--grey-500);
  letter-spacing: 0.04em;
  margin-top: 3px;
  text-transform: uppercase;
}
.spec__val span {
  display: block;
  font-family: var(--ff-en);
  font-size: 12.5px;
  color: var(--grey-500);
  line-height: 1.6;
  margin-top: 4px;
}

.spec-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 30px;
  margin-top: 26px;
  padding: 20px 24px;
  background: var(--silver-50);
  border: 1px dashed var(--silver-300);
  border-radius: var(--r-md);
  font-size: 13.5px;
  color: var(--grey-600);
}
.spec-note b { color: var(--navy-900); font-weight: 600; }
.spec-note svg { width: 18px; height: 18px; flex: none; color: var(--navy-400); }
.spec-note .tlink { margin-left: auto; }

/* 技术参数放在深灰金属底上，作为整页中段的深色断点 */
.sec--steel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 420px at 82% 8%, rgba(46, 111, 183, 0.22), transparent 70%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: auto, 76px 76px;
  pointer-events: none;
}
.sec--steel > .wrap { position: relative; z-index: 2; }

.sec--steel .spec {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.028);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.9);
}
.sec--steel .spec thead th {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.03));
  border-right-color: rgba(255, 255, 255, 0.12);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
}
.sec--steel .spec thead th small { color: var(--silver-400); }
.sec--steel .spec tbody td {
  border-bottom-color: rgba(255, 255, 255, 0.09);
  border-right-color: rgba(255, 255, 255, 0.09);
  color: rgba(255, 255, 255, 0.8);
}
.sec--steel .spec tbody tr:nth-child(even) td { background: rgba(255, 255, 255, 0.032); }
.sec--steel .spec tbody tr:hover td { background: rgba(46, 111, 183, 0.16); }
.sec--steel .spec__key {
  background: rgba(255, 255, 255, 0.055) !important;
  color: #fff !important;
}
.sec--steel .spec__key span { color: var(--silver-400); }
.sec--steel .spec__val span { color: rgba(255, 255, 255, 0.5); }
.sec--steel .spec-note {
  background: rgba(255, 255, 255, 0.035);
  border-color: rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.66);
}
.sec--steel .spec-note b { color: #fff; }
.sec--steel .spec-note svg { color: var(--silver-300); }

/* 打印时把深色参数区还原为白底黑字，方便工程师直接打印选型 */
@media print {
  .sec--steel { background: #fff !important; color: #000 !important; }
  .sec--steel::before { display: none; }
  .sec--steel .h-sec,
  .sec--steel .eyebrow,
  .sec--steel .sec-sub { color: #000 !important; }
  .sec--steel .spec { border-color: #bbb !important; background: #fff !important; box-shadow: none; }
  .sec--steel .spec thead th { background: #eee !important; color: #000 !important; text-shadow: none; }
  .sec--steel .spec thead th small,
  .sec--steel .spec__key span,
  .sec--steel .spec__val span { color: #555 !important; }
  .sec--steel .spec tbody td { border-color: #ddd !important; color: #000 !important; }
  .sec--steel .spec tbody tr:nth-child(even) td { background: #f7f7f7 !important; }
  .sec--steel .spec__key { background: #f0f0f0 !important; color: #000 !important; }
  .sec--steel .spec-note { background: #f7f7f7 !important; border-color: #ccc !important; color: #333 !important; }
  .sec--steel .spec-note b { color: #000 !important; }
}

/* ---------- 11. 应用场景 ---------- */
.apps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

.app {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--navy-900);
  min-height: 268px;
  display: flex;
  align-items: flex-end;
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.app:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.app img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.04) brightness(0.92);
  transition: transform 0.7s var(--ease), filter 0.5s var(--ease);
}
.app:hover img { transform: scale(1.05); filter: saturate(1) contrast(1.06) brightness(1); }
.app::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 21, 36, 0.16) 0%, rgba(6, 21, 36, 0.72) 58%, rgba(6, 21, 36, 0.94) 100%);
}
.app__in { position: relative; z-index: 2; padding: 28px 28px 26px; width: 100%; }
.app__no {
  font-family: var(--ff-en);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--silver-400);
}
.app h3 {
  margin-top: 10px;
  font-size: 18.5px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.01em;
}
.app__en {
  font-family: var(--ff-en);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--silver-300);
  margin-top: 5px;
}
.app p:not(.app__en) {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
}
.app__en-txt {
  font-family: var(--ff-en);
  font-size: 12px !important;
  color: rgba(255, 255, 255, 0.5) !important;
}

/* 第 7 张通栏 */
.app--wide {
  grid-column: 1 / -1;
  min-height: 300px;
}
.app--wide .app__in { max-width: 640px; }

/* ---------- 12. 工程案例 ---------- */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: all 0.34s var(--ease);
  display: flex;
  flex-direction: column;
}
.case:hover { border-color: var(--silver-300); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.case__img { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.case__img img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.75) brightness(0.95);
  transition: transform 0.7s var(--ease), filter 0.5s var(--ease);
}
.case:hover .case__img img { transform: scale(1.05); filter: saturate(1) brightness(1); }
.case__tag {
  position: absolute;
  left: 16px; top: 16px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  background: rgba(6, 21, 36, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  backdrop-filter: blur(6px);
}
.case__body { padding: 26px 26px 28px; flex: 1; display: flex; flex-direction: column; }
.case h3 { font-size: 17.5px; font-weight: 700; color: var(--navy-900); line-height: 1.5; }
.case__en {
  font-family: var(--ff-en);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--navy-400);
  margin-top: 7px;
  line-height: 1.5;
}
.case p:not(.case__en) { margin-top: 14px; font-size: 14px; line-height: 1.8; color: var(--grey-600); }
.case__meta {
  margin-top: auto;
  padding-top: 20px;
  display: grid;
  gap: 9px;
  border-top: 1px solid var(--line);
}
.case__meta div { display: flex; gap: 10px; font-size: 13px; color: var(--steel-700); }
.case__meta dt {
  flex: none;
  width: 62px;
  color: var(--grey-500);
  font-size: 12.5px;
}
.case__meta dd { margin: 0; }

/* ---------- 13. 企业实力 ---------- */
.sec--dark .strength-top {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  overflow: hidden;
  margin-bottom: 62px;
}
.strength-top div {
  background: var(--navy-900);
  padding: 32px 30px 34px;
}
.strength-top b {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--ff-en);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #fff;
}
.strength-top b small { font-size: 16px; color: var(--silver-300); }
.strength-top p { margin-top: 12px; font-size: 13.5px; color: rgba(255, 255, 255, 0.6); }
.strength-top p i {
  display: block;
  font-style: normal;
  font-family: var(--ff-en);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.34);
  margin-top: 3px;
}

.str { display: grid; grid-template-columns: 1fr 1fr; gap: 0 54px; }
.str li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-dark);
}
.str__ico {
  width: 44px; height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-sm);
  display: grid; place-items: center;
  background: rgba(255, 255, 255, 0.04);
}
.str__ico svg { width: 21px; height: 21px; color: var(--silver-300); }
.str h3 { font-size: 16.5px; font-weight: 600; color: #fff; }
.str h3 span:first-child { margin-right: 10px; }
.str p { margin-top: 8px; font-size: 14px; line-height: 1.78; color: rgba(255, 255, 255, 0.6); }

.str h3 span.en {
  display: block;
  margin-left: 0;
  margin-top: 5px;
  font-family: var(--ff-en);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--silver-400);
}

/* 企业实力网格中的询盘提示卡 */
.str li.str__cta {
  grid-column: auto;
  grid-template-columns: 1fr;
  gap: 18px;
  align-content: center;
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--r-md);
  padding: 26px 24px;
  margin: 14px 0;
  background: rgba(255, 255, 255, 0.03);
}
.str li.str__cta h3 { font-size: 17px; }
.str li.str__cta p { margin-top: 9px; }
.str li.str__cta .btn { justify-self: start; }

/* 工厂实景 */
.tour { margin-top: 76px; display: grid; grid-template-columns: 1.55fr 1fr; gap: 26px; }
.tour__player {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 9;
}
.tour__player video { width: 100%; height: 100%; object-fit: cover; }
.tour__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: opacity 0.4s var(--ease);
}
.tour__ph::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 21, 36, 0.35), rgba(6, 21, 36, 0.62));
}
.tour__play {
  position: relative;
  z-index: 2;
  width: 78px; height: 78px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  display: grid; place-items: center;
  transition: all 0.3s var(--ease);
}
.tour__ph:hover .tour__play { background: rgba(255, 255, 255, 0.24); transform: scale(1.06); }
.tour__play svg { width: 24px; height: 24px; color: #fff; margin-left: 4px; }
.tour__ph.is-hidden { opacity: 0; pointer-events: none; }
.tour__cap {
  position: absolute;
  left: 26px; bottom: 22px;
  z-index: 2;
  color: #fff;
}
.tour__cap b { display: block; font-size: 17px; font-weight: 600; }
.tour__cap span {
  font-family: var(--ff-en);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
}

.tour__side { display: grid; grid-template-rows: 1fr 1fr; gap: 26px; }
.tour__th {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
  min-height: 0;
}
.tour__th img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.72);
}
.tour__th span {
  position: absolute;
  left: 18px; bottom: 16px;
  z-index: 2;
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
}
.tour__th span i {
  display: block;
  font-style: normal;
  font-family: var(--ff-en);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
  margin-top: 2px;
}
.tour__th.is-on { border-color: var(--silver-300); }
.tour__th.is-on img { filter: saturate(1) brightness(0.9); }

/* ---------- 14. 询盘 ---------- */
.inq { display: grid; grid-template-columns: 1.25fr 1fr; gap: 0; border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.inq__form { background: #fff; border: 1px solid var(--line); border-right: 0; padding: 52px 54px 54px; }
.inq__aside {
  background: var(--navy-900);
  color: #fff;
  padding: 52px 46px 54px;
  position: relative;
  overflow: hidden;
}
.inq__aside::before {
  content: "";
  position: absolute;
  right: -120px; top: -120px;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 111, 183, 0.28), transparent 68%);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
/* 表单各行（.form-row / 单列的 .field / .form-foot）之间的纵向间距统一在这里控制。
   字段自身不加 margin-top —— 否则栅格里的第二列会多出 20px，
   与第一列顶部错开一整行（曾在预览里表现为「格子没对齐」）。 */
#inquiry-form > * + * { margin-top: 20px; }
.field { margin-top: 0; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--steel-700);
  margin-bottom: 9px;
  letter-spacing: 0.01em;
}
.field label em {
  font-style: normal;
  font-family: var(--ff-en);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--grey-400);
  margin-left: 6px;
}
.field label i { color: #c0392b; font-style: normal; margin-left: 2px; }

/* ── 整站语言门控：英文镜像页（en/index.html）隐藏「仅供中文语境」的装饰元素 ──
   这样一来：中文页保留「姓名 / Name」的中英对照排版；
   独立的英文页则不会出现 "Name / Name" 这类重复。 */
html[data-default-lang="en"] .only-zh { display: none !important; }
.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 14px 16px;
  font: inherit;
  font-size: 14.5px;
  color: var(--steel-800);
  background: var(--silver-50);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: all 0.24s var(--ease);
  font-family: var(--ff);
}
.field textarea { min-height: 118px; resize: vertical; line-height: 1.7; }
.field input::placeholder,
.field textarea::placeholder { color: var(--grey-400); }
.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  background: #fff;
  border-color: var(--navy-500);
  box-shadow: 0 0 0 3px rgba(28, 69, 112, 0.1);
}
.field.is-error input,
.field.is-error textarea { border-color: #c0392b; background: #fdf4f3; }
.field__err {
  display: none;
  margin-top: 7px;
  font-size: 12.5px;
  color: #c0392b;
}
.field.is-error .field__err { display: block; }

.form-foot {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.form-privacy { font-size: 12.5px; color: var(--grey-500); line-height: 1.6; flex: 1; min-width: 180px; }

/* 提交结果卡片：邮件 / WhatsApp / 复制 三条通道并列，
   客户无论用网页版邮箱还是手机 WhatsApp 都能把询盘发出来 */
.form-ok {
  display: none;
  padding: 22px 24px;
  border-radius: var(--r-md);
  background: #f2f8f4;
  border: 1px solid #cfe6d8;
}
.form-ok.is-on { display: block; }
.form-ok__hd {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #1f6b48;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
}
.form-ok__hd svg { width: 18px; height: 18px; flex: none; }
.form-ok__tip { margin-top: 9px; font-size: 13px; line-height: 1.8; color: var(--grey-600); }
/* 本地存储不可用（无痕模式 / 配额写满）时的兜底提示 */
.form-ok__warn { margin-top: 11px; padding: 10px 13px; border-radius: var(--r-sm); background: #fdf3f1; border: 1px solid #e8c4bd; font-size: 12.5px; line-height: 1.75; color: #8d2f22; }

/* 提交失败的兜底提示（放在按钮下方，不进成功卡片） */
.form-err { margin-top: 14px; padding: 12px 15px; border-radius: var(--r-sm); background: #fdf3f1; border: 1px solid #e8c4bd; font-size: 13px; line-height: 1.75; color: #8d2f22; }

/* 蜜罐字段：移出可视区域但保留在 DOM 里（不用 display:none，某些脚本会跳过隐藏元素） */
.hp { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.form-ok__acts { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 10px; }
.form-ok__more { margin-top: 14px; }
.form-ok__more summary {
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--navy-700);
  padding: 4px 0;
  list-style: none;
}
.form-ok__more summary::-webkit-details-marker { display: none; }
.form-ok__more summary::before { content: "▸ "; }
.form-ok__more[open] summary::before { content: "▾ "; }
.form-ok__more pre {
  margin-top: 10px;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--steel-700);
  white-space: pre-wrap;
  word-break: break-word;
}

.ct { position: relative; z-index: 2; }
.ct__h {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.01em;
}
.ct__he {
  font-family: var(--ff-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--silver-400);
  margin-top: 7px;
}
.ct__list { margin-top: 32px; display: grid; gap: 2px; }
.ct__list li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 16px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line-dark);
  align-items: start;
}
.ct__list li:last-child { border-bottom: 0; }
.ct__ico {
  width: 38px; height: 38px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.05);
  display: grid; place-items: center;
}
.ct__ico svg { width: 17px; height: 17px; color: var(--silver-300); }
.ct__list dt,
.ct__list .ct__dt {
  display: block;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  font-family: var(--ff-en);
}
.ct__list dd,
.ct__list .ct__dd {
  display: block;
  margin: 5px 0 0;
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  line-height: 1.65;
  word-break: break-word;
}
.ct__list dd a:hover,
.ct__list .ct__dd a:hover { color: var(--silver-200); text-decoration: underline; }
.ct__list dd small,
.ct__list .ct__dd small {
  display: block;
  font-size: 12.5px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 3px;
}

.ct__qr {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  align-items: center;
  gap: 16px;
}
.ct__qr div {
  width: 78px; height: 78px;
  flex: none;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px dashed rgba(255, 255, 255, 0.24);
  display: grid; place-items: center;
  font-size: 11px;
  color: rgba(255, 255, 255, 0.45);
  text-align: center;
  line-height: 1.4;
  padding: 6px;
}
.ct__qr p { font-size: 13px; color: rgba(255, 255, 255, 0.58); line-height: 1.7; }
.ct__qr p b { display: block; color: #fff; font-size: 14.5px; font-weight: 600; margin-bottom: 3px; }

/* ---------- 15. 页脚 ---------- */
.footer { background: var(--navy-900); color: rgba(255, 255, 255, 0.62); padding-top: 78px; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.25fr;
  gap: 46px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line-dark);
}
.footer__brand .logo__zh { color: #fff; }
.footer__brand .logo__en { color: var(--silver-400); }
.footer__brand p { margin-top: 22px; font-size: 13.5px; line-height: 1.9; }
.footer__brand p + p {
  margin-top: 12px;
  font-family: var(--ff-en);
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.42);
}
.footer h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 22px;
  letter-spacing: 0.02em;
}
.footer h4 small {
  display: block;
  font-family: var(--ff-en);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver-400);
  margin-top: 4px;
}
.footer__links { display: grid; gap: 12px; }
.footer__links a {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.62);
  transition: color 0.22s var(--ease), padding 0.25s var(--ease);
}
.footer__links a:hover { color: #fff; padding-left: 5px; }
.footer__ct { display: grid; gap: 16px; }
.footer__ct li { display: grid; grid-template-columns: 16px 1fr; gap: 12px; font-size: 13.5px; line-height: 1.7; }
.footer__ct svg { width: 15px; height: 15px; color: var(--silver-400); margin-top: 4px; }
.footer__ct a:hover { color: #fff; }
.footer__ct small {
  display: block;
  font-family: var(--ff-en);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.05em;
}

.footer__bottom {
  padding: 26px 0 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 30px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.42);
}
.footer__bottom a:hover { color: rgba(255, 255, 255, 0.8); }
.footer__bottom-links { display: flex; flex-wrap: wrap; gap: 22px; }

/* ---------- 16. 悬浮元素 ---------- */
.totop {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 150;
  width: 46px; height: 46px;
  border-radius: var(--r-sm);
  background: var(--navy-800);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.32s var(--ease);
}
.totop.is-on { opacity: 1; visibility: visible; transform: translateY(0); }
.totop:hover { background: var(--navy-600); }
.totop svg { width: 19px; height: 19px; }

/* 移动端底部操作条 */
.mbar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 160;
  background: rgba(6, 21, 36, 0.96);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-dark);
  padding: 9px 12px calc(9px + env(safe-area-inset-bottom));
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.mbar a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 7px 4px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.8);
  border-radius: var(--r-sm);
}
.mbar a:active { background: rgba(255, 255, 255, 0.08); }
.mbar svg { width: 18px; height: 18px; color: var(--silver-300); }
.mbar a.is-cta { background: var(--metal); color: var(--navy-900); font-weight: 600; }
.mbar a.is-cta svg { color: var(--navy-900); }

/* ---------- 17. 滚动显现 ---------- */
section[id] { scroll-margin-top: calc(var(--header-h) + 10px); }

.btn[data-busy] { opacity: 0.6; pointer-events: none; }

/* 滚动显现：仅在 JS 可用时隐藏，保证禁用 JS / 不执行 JS 的爬虫能看到全部内容 */
.rv { transition: opacity 0.75s var(--ease), transform 0.75s var(--ease); }
.js .rv {
  opacity: 0;
  transform: translateY(26px);
}
.js .rv.is-in { opacity: 1; transform: none; }
.rv[data-d="1"] { transition-delay: 0.08s; }
.rv[data-d="2"] { transition-delay: 0.16s; }
.rv[data-d="3"] { transition-delay: 0.24s; }
.rv[data-d="4"] { transition-delay: 0.32s; }
.rv[data-d="5"] { transition-delay: 0.4s; }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1140px) {
  .nav__list a { padding: 10px 9px; font-size: 14.5px; }
  .grid-3, .apps, .cases { grid-template-columns: repeat(2, 1fr); }
  .ov { gap: 52px; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1.2fr; }
  .footer__grid > :nth-child(3) { display: none; }
}

@media (max-width: 980px) {
  .nav, .header__act .btn { display: none; }
  .burger { display: block; }
  .header__in { gap: 14px; }
  .header__act { margin-left: auto; }

  .sec { padding: 76px 0; }
  .sec--tight { padding: 64px 0; }
  .hero { padding: 72px 0 118px; min-height: auto; }
  .hero h1 { font-size: clamp(27px, 6.2vw, 38px); }
  .hero__sub { font-size: 15.5px; }
  .hero__stats ul { grid-template-columns: repeat(2, 1fr); }
  .hero__stats li { padding: 18px 18px 20px; }
  .hero__stats li:nth-child(odd) { border-left: 0; padding-left: 0; }
  .hero__stats li:nth-child(n + 3) { border-top: 1px solid rgba(255, 255, 255, 0.1); }
  .stat__num { font-size: 26px; }

  .h-sec { font-size: 28px; }
  .sec-head { margin-bottom: 40px; }

  .ov { grid-template-columns: 1fr; gap: 46px; }
  .ov__media { order: -1; }
  .ov__card { left: 18px; right: auto; bottom: 18px; width: 190px; padding: 18px 20px; }
  .ov__card b { font-size: 28px; }
  .ov__list { grid-template-columns: 1fr; }

  .struct { grid-template-columns: 1fr; gap: 34px; padding: 34px 28px; margin-top: 56px; }
  .struct__fig svg { max-width: 240px; }
  .struct__layers li { grid-template-columns: 24px 1fr; }
  .struct__layers em { grid-column: 2; text-align: left; margin-top: 4px; }

  .inq { grid-template-columns: 1fr; }
  .inq__form { padding: 38px 28px 40px; border-right: 1px solid var(--line); border-bottom: 0; }
  .inq__aside { padding: 38px 28px 40px; }
  .form-row { grid-template-columns: 1fr; gap: 20px; }

  .strength-top { grid-template-columns: repeat(2, 1fr); }
  .str { grid-template-columns: 1fr; gap: 0; }
  .tour { grid-template-columns: 1fr; }
  .tour__side { grid-template-rows: none; grid-template-columns: 1fr 1fr; }
  .tour__th { aspect-ratio: 16 / 10; }

  .app--wide { min-height: 280px; }

  .totop { right: 14px; bottom: 82px; }
  .mbar { display: grid; }
  .footer__bottom { padding-bottom: 94px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .sec { padding: 62px 0; }
  .sec--tight { padding: 54px 0; }
  .grid-3, .grid-2, .apps, .cases { grid-template-columns: 1fr; }
  .topbar__list li:not(:first-child) { display: none; }
  .topbar__tag { display: none; }
  .topbar__in { justify-content: center; }

  .logo__zh { font-size: 17px; }
  .logo__en { font-size: 8.5px; letter-spacing: 0.2em; }
  .logo__mark { width: 34px; height: 34px; }

  .hero { padding: 56px 0 106px; }
  .hero__badges { gap: 7px; margin-bottom: 20px; }
  .chip { padding: 6px 11px; font-size: 11.5px; }
  .hero__cta { gap: 10px; }
  .hero__cta .btn { flex: 1 1 46%; padding: 14px 18px; }
  .h-sec { font-size: 24px; }
  .sec-sub { font-size: 15px; }

  .adv { padding: 30px 24px 30px; }
  .app { min-height: 232px; }
  .app__in { padding: 22px 22px 20px; }
  .spec { border-radius: var(--r-sm); }
  .spec table { font-size: 13px; }
  .spec thead th, .spec tbody td { padding: 12px 13px; }
  .spec { overflow-x: auto; }
  .spec table { min-width: 620px; }

  .strength-top div { padding: 24px 20px 26px; }
  .strength-top b { font-size: 28px; }
  .str li { grid-template-columns: 38px 1fr; gap: 15px; }
  .str__ico { width: 38px; height: 38px; }
  .tour__cap { left: 18px; bottom: 16px; }
  .tour__cap b { font-size: 15px; }

  .footer { padding-top: 58px; }
  .footer__grid { grid-template-columns: 1fr; gap: 34px; padding-bottom: 40px; }
  .footer__grid > :nth-child(3) { display: block; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }

  .ov__card { position: static; width: auto; margin-top: 18px; right: auto; bottom: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .rv { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------- 19. 打印 ---------- */
@media print {
  .header, .topbar, .mbar, .totop, .drawer, .inq__aside { display: none; }
  .sec { padding: 24px 0; page-break-inside: avoid; }
  .hero { min-height: auto; background: #fff; color: #000; }
}