/* ============================================================
   CHR 杭可集团 · 单页官网  v2
   视觉：浅灰 / 银白 / 冷白 + 极少量冷蓝科技光效 + 品牌红
   字体：思源宋体 Black（标题·金属渐变） / 黑体（正文） / Space Grotesk（数据）
   ============================================================ */

:root{
  /* 色板 */
  --bg:        #F4F6F9;
  --bg-2:      #EBEEF2;
  --bg-deep:   #0E1216;
  --ink:       #10151B;
  --ink-2:     #5C6673;
  --ink-3:     #99A2AD;
  --line:      rgba(16,21,27,.08);
  --blue:      #3D7BFD;
  --red:       #9c1d2e;
  --brand-red: #9c1d2e;   /* 品牌红 · 仅用于 CHR 标识 */
  --white:     #FFFFFF;

  /* 字体 */
  --font-display: "Noto Serif SC","Songti SC","SimSun",serif;   /* 思源宋体 Black */
  --font-cn:      "Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-en:      "Space Grotesk","Noto Sans SC","PingFang SC",sans-serif;

  /* 布局 */
  --max-w: 1360px;
  --pad-x: clamp(20px, 6vw, 96px);
  --radius: 22px;

  --ease-out: cubic-bezier(.22,.61,.2,1);
  --ease-ink: cubic-bezier(.62,.04,.2,1);
}

*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }

html{ scroll-behavior:smooth; scroll-padding-top:76px; }

body{
  font-family:var(--font-cn);
  background:var(--bg);
  color:var(--ink);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
button{ font-family:inherit; border:0; background:none; cursor:pointer; }
::selection{ background:var(--blue); color:#fff; }

.eyebrow{
  font-family:var(--font-en);
  font-size:11px; font-weight:500;
  letter-spacing:.38em; text-transform:uppercase;
  color:var(--ink-3);
}
.eyebrow--light{ color:rgba(255,255,255,.45); }

/* ---------------- 大标题的扫描揭示 + 金属渐变 ---------------- */
/* 深色底上的钛银渐变（首屏 / 宣传片） */
.ink--metal-light{
  background:linear-gradient(180deg, #FFFFFF 22%, #DDE5EE 55%, #9FB0C4 100%);
  -webkit-background-clip:text; background-clip:text;
  color:transparent; -webkit-text-fill-color:transparent;
}
/* 浅色底上的锻铁渐变（杭可仪器 / 探索杭可） */
.ink--metal-dark{
  background:linear-gradient(180deg, #262E38 15%, #10151B 52%, #46566B 100%);
  -webkit-background-clip:text; background-clip:text;
  color:transparent; -webkit-text-fill-color:transparent;
}
.ink{
  display:inline-block;
  -webkit-clip-path:inset(-20% 100% -20% 0);
  clip-path:inset(-20% 100% -20% 0);
  transition:-webkit-clip-path 1.5s var(--ease-ink), clip-path 1.5s var(--ease-ink);
}
[data-reveal].is-in .ink,
.is-revealed .ink{
  -webkit-clip-path:inset(-20% 0 -20% 0);
  clip-path:inset(-20% 0 -20% 0);
}
.ink--hero{
  animation:inkStroke 1.7s var(--ease-ink) .5s forwards;
}
@keyframes inkStroke{
  from{ -webkit-clip-path:inset(-20% 100% -20% 0); clip-path:inset(-20% 100% -20% 0); }
  to{ -webkit-clip-path:inset(-20% 0 -20% 0); clip-path:inset(-20% 0 -20% 0); }
}

/* ---------------- 进场 / 滚动显现 ---------------- */
.load-seq{
  opacity:0; transform:translateY(26px);
  animation:seqIn 1s var(--ease-out) forwards;
  animation-delay:calc(.25s + var(--i,0) * .18s);
}
@keyframes seqIn{ to{ opacity:1; transform:none; } }

[data-reveal]{
  opacity:0; transform:translateY(34px);
  transition:opacity .9s var(--ease-out), transform .9s var(--ease-out);
  transition-delay:calc(var(--d,0) * 90ms);
}
[data-reveal].is-in{ opacity:1; transform:none; }

/* ============================================================
   顶部导航 + CHR 粒子 LOGO
   ============================================================ */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:100;
  display:flex; align-items:center; gap:40px;
  height:76px;
  padding:0 var(--pad-x);
  color:#fff;
  transition:background .45s ease, color .45s ease, box-shadow .45s ease,
             backdrop-filter .45s ease, height .45s ease;
}

/* --- LOGO --- */
.brandmark{
  display:flex; align-items:center; gap:9px;   /* 更靠近 CHR */
  position:relative;
}
.brandmark__mark{
  position:relative;
  width:132px; height:36px;
  display:block;
}
#logoCanvas{
  width:132px; height:36px;
  display:block;
}
/* WebGL 不可用时的纯文字回退 */
.brandmark__chr{
  position:absolute; inset:0;
  display:none;
  align-items:center; justify-content:center;
  font-family:var(--font-en);
  font-size:26px; font-weight:600; letter-spacing:.1em;
  color:var(--red);
}
.brandmark.no-webgl #logoCanvas{ display:none; }
.brandmark.no-webgl .brandmark__chr{ display:flex; }


.brandmark__txt{
  display:flex; flex-direction:column; justify-content:center;
  gap:3px;
  padding-left:9px;
  border-left:1px solid currentColor;
}
.brandmark__cn{
  font-size:17px; font-weight:600;
  letter-spacing:.2em;
  line-height:1;
  opacity:.92;
  transition:letter-spacing .5s var(--ease-out), opacity .4s;
}
.brandmark__en{
  font-size:7px; font-weight:500;
  letter-spacing:.4em;
  line-height:1;
  opacity:.62;
  white-space:nowrap;
}
.brandmark:hover .brandmark__cn{ letter-spacing:.26em; opacity:1; }



/* Unified raster logo, replacing the previous canvas-generated CHR mark. */
.brandmark {
  min-width: 0;
}
.brandmark__logo {
  display: block;
  width: min(250px, 28vw);
  height: 46px;
  object-fit: contain;
  object-position: left center;
}
.nav.is-solid .brandmark__logo {
  height: 42px;
}
@media (max-width: 760px) {
  .brandmark__logo {
    width: min(210px, 45vw);
    height: 38px;
  }
}
@media (max-width: 520px) {
  .brandmark__logo {
    width: min(170px, 52vw);
    height: 34px;
  }
}

.nav__links{
  margin-left:auto;
  display:flex; gap:34px;
  font-size:14px; letter-spacing:.1em;
}
.nav__links a{ opacity:.78; transition:opacity .25s; position:relative; }
.nav__links a::after{
  content:""; position:absolute; left:0; bottom:-6px;
  width:100%; height:1px; background:currentColor;
  transform:scaleX(0); transform-origin:left;
  transition:transform .35s var(--ease-out);
}
.nav__links a:hover{ opacity:1; }
.nav__links a:hover::after{ transform:scaleX(1); }

.nav__cta{
  font-size:13px; letter-spacing:.12em;
  padding:9px 22px;
  border:1px solid rgba(255,255,255,.4);
  border-radius:100px;
  transition:all .3s ease;
}
.nav__cta:hover{ background:#fff; color:var(--ink); border-color:#fff; }

.nav.is-solid{
  height:66px;
  color:var(--ink);
  background:rgba(244,246,249,.72);
  -webkit-backdrop-filter:blur(18px) saturate(1.4);
  backdrop-filter:blur(18px) saturate(1.4);
  box-shadow:0 1px 0 var(--line);
}
.nav.is-solid .nav__cta{ border-color:rgba(16,21,27,.25); }
.nav.is-solid .nav__cta:hover{ background:var(--ink); color:#fff; border-color:var(--ink); }
.nav.is-solid .brandmark__txt{ border-left-color:rgba(16,21,27,.2); }

/* ============================================================
   SECTION 1 · 首屏视频
   ============================================================ */
.hero{
  position:relative;
  height:100vh; height:100svh;
  min-height:600px;
  overflow:hidden;
  color:#fff;
  background:var(--bg-deep);
}
.hero__media{ position:absolute; inset:0; }
.hero__video{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }
.hero.video-failed .hero__video{ display:none; }

.hero__fallback{
  position:absolute; inset:0;
  background:
    radial-gradient(120% 90% at 18% 30%, rgba(61,123,253,.16), transparent 55%),
    radial-gradient(90% 70% at 82% 78%, rgba(180,196,215,.14), transparent 60%),
    linear-gradient(155deg, #171C22 0%, #0E1216 48%, #12181F 100%);
}
.hero__fallback::after{
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(80% 70% at 50% 45%, #000 20%, transparent 100%);
  mask-image:radial-gradient(80% 70% at 50% 45%, #000 20%, transparent 100%);
}
.hero__fallback-tag{
  position:absolute; right:22px; bottom:20px; z-index:2;
  font-size:12px; color:rgba(255,255,255,.4);
  letter-spacing:.05em;
  border:1px dashed rgba(255,255,255,.22);
  border-radius:8px; padding:7px 12px;
  opacity:0; transition:opacity .5s;
}
.hero.video-failed .hero__fallback-tag{ opacity:1; }
.hero__fallback-tag b{ color:rgba(255,255,255,.75); font-weight:500; }

.hero__shade{
  position:absolute; inset:0;
  background:
    linear-gradient(90deg, rgba(8,11,14,.62) 0%, rgba(8,11,14,.28) 38%, rgba(8,11,14,0) 62%),
    linear-gradient(0deg, rgba(8,11,14,.55) 0%, rgba(8,11,14,0) 34%);
}

.hero__content{
  position:absolute; z-index:3;
  left:var(--pad-x);
  bottom:clamp(84px, 16vh, 168px);
  max-width:min(820px, 86vw);
}
.hero__eyebrow{
  font-family:var(--font-en);
  font-size:12px; font-weight:500;
  letter-spacing:.44em; text-transform:uppercase;
  color:rgba(255,255,255,.55);
  margin-bottom:20px;
}
.hero__title{
  font-family:var(--font-display);
  font-size:clamp(64px, 10.5vw, 105px);
  font-weight:900;
  letter-spacing:.16em;
  line-height:1.1;
  filter:drop-shadow(0 10px 60px rgba(0,0,0,.45));
}
.hero__sub{
  margin-top:22px;
  font-size:clamp(14px, 1.35vw, 17px);
  font-weight:300;
  letter-spacing:.14em;
  color:rgba(255,255,255,.82);
  display:flex; align-items:center; flex-wrap:wrap;
}
.hero__sub-divider{
  display:inline-block;
  width:44px; height:1px; margin:0 18px;
  background:linear-gradient(90deg, rgba(255,255,255,.6), rgba(61,123,253,.9));
}

/* 首屏完整版视频弱入口：低对比毛玻璃 + 细边框，悬停后才增强可点击感 */
.hero__full-video{
  position:absolute; z-index:4;
  right:var(--pad-x);
  bottom:clamp(108px, 18vh, 176px);
  display:inline-flex; align-items:center; gap:10px;
  min-height:42px; padding:7px 12px 7px 8px;
  color:rgba(255,255,255,.72);
  background:rgba(13,20,29,.18);
  border:1px solid rgba(255,255,255,.22);
  border-radius:10px;
  -webkit-backdrop-filter:blur(10px) saturate(112%);
  backdrop-filter:blur(10px) saturate(112%);
  box-shadow:0 10px 28px rgba(0,0,0,.08);
  cursor:pointer;
  transition:transform .24s ease, background .24s ease, border-color .24s ease, color .24s ease, box-shadow .24s ease;
}
.hero__full-video:hover{
  color:#fff;
  background:rgba(13,20,29,.34);
  border-color:rgba(255,255,255,.42);
  transform:translateY(-2px);
  box-shadow:0 14px 34px rgba(0,0,0,.16);
}
.hero__full-video-icon{
  width:27px; height:27px; flex:0 0 27px;
  display:grid; place-items:center;
  border:1px solid rgba(255,255,255,.32);
  border-radius:50%;
  background:rgba(255,255,255,.06);
}
.hero__full-video-icon svg{ width:15px; height:15px; }
.hero__full-video-copy{ display:flex; flex-direction:column; align-items:flex-start; line-height:1.12; white-space:nowrap; }
.hero__full-video-cn{ font-size:12px; font-weight:500; letter-spacing:.08em; }
.hero__full-video-en{ margin-top:3px; font-family:var(--font-en); font-size:8px; letter-spacing:.12em; text-transform:uppercase; opacity:.56; }
.hero__full-video-arrow{ font-family:var(--font-en); font-size:12px; opacity:.48; transition:transform .24s ease, opacity .24s ease; }
.hero__full-video:hover .hero__full-video-arrow{ transform:translate(1px,-1px); opacity:.9; }

.hero__scrollcue{
  position:absolute; z-index:3;
  left:50%; bottom:26px; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
}
.hero__scrollcue-line{
  width:1px; height:44px;
  background:rgba(255,255,255,.35);
  position:relative; overflow:hidden;
}
.hero__scrollcue-line::after{
  content:""; position:absolute; left:0; top:-100%;
  width:100%; height:100%;
  background:linear-gradient(180deg, transparent, #fff);
  animation:cueDrop 2.2s ease-in-out infinite;
}
@keyframes cueDrop{ 0%{top:-100%} 55%,100%{top:100%} }
.hero__scrollcue-text{
  font-family:var(--font-en);
  font-size:9px; letter-spacing:.5em;
  color:rgba(255,255,255,.45);
}

/* ============================================================
   SECTION 2 · 杭可仪器
   ============================================================ */
.instruments{
  position:relative;
  height:260vh;
  background:
    radial-gradient(90% 60% at 50% 100%, var(--bg-2) 0%, var(--bg) 62%),
    var(--bg);
}
.instruments__pin{
  position:sticky; top:0;
  height:100vh; height:100svh;
  min-height:600px; overflow:hidden;
}
.instruments__floor{
  position:absolute; inset:auto 0 0 0; height:44%;
  background:
    radial-gradient(70% 120% at 50% 100%, rgba(16,21,27,.06), transparent 62%),
    linear-gradient(180deg, transparent, rgba(16,21,27,.035));
}
.instruments__floor::before{
  content:""; position:absolute; left:6vw; right:6vw; top:34%;
  height:1px; background:var(--line);
}

.instruments__title{
  position:absolute; z-index:5;
  right:var(--pad-x);
  top:clamp(102px, 17vh, 190px);
  text-align:left;
  max-width:min(500px, 62vw);
  opacity:0; transform:translateX(46px);
  will-change:transform,opacity;
}
.instruments__title h2{
  font-family:var(--font-display);
  font-size:clamp(46px, 6.2vw, 90px);
  font-weight:900;
  letter-spacing:.18em;
  line-height:1.14;
  margin:14px 0 18px;
}
/* English title stays inside the right column without affecting Chinese. */
html[lang="en"] .instruments__title{ width:30vw; max-width:500px; }
html[lang="en"] .instruments__title h2{
  font-size:clamp(32px, 3.5vw, 58px);
  letter-spacing:.025em;
  line-height:1.18;
  overflow-wrap:break-word;
}
@media (max-width:820px){
  html[lang="en"] .instruments__title{ width:auto; max-width:none; }
  html[lang="en"] .instruments__title h2{ font-size:clamp(30px, 6vw, 46px); }
}
.instruments__desc{
  font-size:clamp(13px, 1.15vw, 15px);
  font-weight:300;
  color:var(--ink-2);
  letter-spacing:.06em;
  line-height:2;
}
.instruments__cta{
  margin-top:26px;
  display:inline-flex; align-items:center; justify-content:center; gap:16px;
  min-width:126px; min-height:42px; padding:0 18px;
  border-radius:7px;
  background:#173d6b; color:#fff;
  font-size:13px; font-weight:500; letter-spacing:.08em;
  box-shadow:0 8px 22px rgba(23,61,107,.16);
  transition:transform .22s ease, background .22s ease, box-shadow .22s ease;
}
.instruments__cta:hover{
  background:#102f55; color:#fff;
  transform:translateY(-2px);
  box-shadow:0 12px 28px rgba(23,61,107,.22);
}
.instruments__cta-arrow{ font-family:var(--font-en); font-size:17px; line-height:1; transition:transform .22s ease; }
.instruments__cta:hover .instruments__cta-arrow{ transform:translateX(3px); }

.instruments__stage{ position:absolute; inset:0; }
.car{
  position:absolute;
  left:6vw;
  bottom:clamp(90px, 15vh, 170px);
  width:clamp(420px, 47vw, 800px);
  will-change:transform,filter;
  z-index:4;

  /* 反光只在车体内部混合，不会溢到页面背景上 */
  isolation:isolate;

  /* ↓↓↓ 挡风玻璃区域（相对整张车图的内缩百分比）。对不准时用 index.html?glass 调 ↓↓↓ */
  --glass-t:16%;   /* 距车图顶部 */
  --glass-r:26%;   /* 距车图右侧 */
  --glass-b:48%;   /* 距车图底部 */
  --glass-l:16%;   /* 距车图左侧 */
  --sweep-dur:6s;  /* 玻璃扫光的循环周期 */
  --rim-dur:5.2s;  /* 轮廓流光的循环周期 */
}
.car img{
  width:100%; height:auto;
  user-select:none; -webkit-user-drag:none;
  filter:drop-shadow(0 18px 34px rgba(16,21,27,.12));
}
/* Client-approved factory photo: present it as a restrained 16:9 showcase. */
.car--production-sheet{
  left:4vw;
  top:clamp(102px, 17vh, 190px);
  bottom:auto;
  width:min(60vw, 1160px);
  aspect-ratio:16 / 9;
  overflow:hidden;
  background:transparent;
}
.car--production-sheet::before{
  content:"";
  position:absolute;
  inset:-60px;
  z-index:-1;
  background:#fff;
  filter:blur(32px);
  pointer-events:none;
}
.car--production-sheet img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 48%;
  -webkit-mask-image:
    linear-gradient(to right, transparent 0%, #000 4%, #000 96%, transparent 100%),
    linear-gradient(to bottom, transparent 0%, #000 6%, #000 94%, transparent 100%);
  -webkit-mask-composite:source-in;
  mask-image:
    linear-gradient(to right, transparent 0%, #000 4%, #000 96%, transparent 100%),
    linear-gradient(to bottom, transparent 0%, #000 6%, #000 94%, transparent 100%);
  mask-composite:intersect;
  filter:none;
  transform:translateY(0) scale(1);
  transition:transform .75s var(--ease-out), filter .75s var(--ease-out);
  will-change:transform;
}
@media (hover:hover) and (pointer:fine){
  .car--production-sheet:hover img{
    transform:translateY(-8px) scale(1.018);
    filter:drop-shadow(0 20px 28px rgba(16,21,27,.14));
  }
}
.car--production-sheet .glare,
.car--production-sheet .car__shadow,
.car--production-sheet .rim{ display:none; }
/* —— 车身流光 ——
   .rim__img 套 SVG 滤镜后只剩一圈描边（车图本身不显示），
   再用一条移动的遮罩带把描边逐段点亮，于是高光看起来是沿车身轮廓流动的。
   没有常驻描边，光走过之后车身恢复原样。
   遮罩带移动用 mask-position 动画，元素小、滤镜结果可缓存，开销很低。 */
.svgdefs{ position:absolute; width:0; height:0; overflow:hidden; }

.rim{
  position:absolute; inset:0;
  pointer-events:none;
  z-index:3;
}
.rim__img{
  width:100%; height:auto; display:block;
  -webkit-user-drag:none; user-select:none;
}

/* 流动高光（车身不带常驻描边，只有光掠过时才亮） */
.rim--run{
  opacity:.95;
  will-change:mask-position;
  -webkit-mask-image:linear-gradient(96deg,
      transparent 0%, transparent 33%,
      rgba(0,0,0,.22) 41%,
      rgba(0,0,0,1) 50%,
      rgba(0,0,0,.22) 59%,
      transparent 67%, transparent 100%);
  mask-image:linear-gradient(96deg,
      transparent 0%, transparent 33%,
      rgba(0,0,0,.22) 41%,
      rgba(0,0,0,1) 50%,
      rgba(0,0,0,.22) 59%,
      transparent 67%, transparent 100%);
  -webkit-mask-size:240% 100%; mask-size:240% 100%;
  -webkit-mask-repeat:no-repeat; mask-repeat:no-repeat;
  -webkit-mask-position:120% 0; mask-position:120% 0;
  animation:rimRun var(--rim-dur, 5.2s) cubic-bezier(.36,0,.24,1) infinite;
}
.rim--run .rim__img{ filter:url(#carRimHot); }

/* 遮罩尺寸 240%，百分比越大图越往左 —— 从 120% 到 -20% 即高光自左向右掠过 */
@keyframes rimRun{
  0%   { -webkit-mask-position:120% 0; mask-position:120% 0; }
  56%  { -webkit-mask-position:-20% 0; mask-position:-20% 0; }
  100% { -webkit-mask-position:-20% 0; mask-position:-20% 0; }
}

/* —— 挡风玻璃反光 ——
   三层嵌套实现：
   .glare       用车图 PNG 自身做遮罩（JS 注入），光斑绝不会溢出车体轮廓；
   .glare__band 椭圆羽化遮罩，把光限制在玻璃区域并柔化边缘；
   .glare__sweep 斜向高光条，循环扫过。嵌套遮罩天然相交，无需 mask-composite。 */
.glare{
  position:absolute; inset:0; z-index:2;
  pointer-events:none;
  opacity:.75;
  /* 用 normal 而非 screen：白光 screen 叠在浅色车身/浅灰背景上几乎没有变化，
     深色车身可改成 screen 让高光更"发光"。 */
  mix-blend-mode:var(--glare-blend, normal);
  -webkit-mask-repeat:no-repeat; mask-repeat:no-repeat;
  -webkit-mask-size:100% 100%; mask-size:100% 100%;
  -webkit-mask-position:center; mask-position:center;
}
.glare__band{
  position:absolute;
  top:var(--glass-t); right:var(--glass-r);
  bottom:var(--glass-b); left:var(--glass-l);
  overflow:hidden;
  -webkit-mask-image:radial-gradient(ellipse 64% 78% at 50% 46%,
      #000 32%, rgba(0,0,0,.55) 66%, transparent 100%);
  mask-image:radial-gradient(ellipse 64% 78% at 50% 46%,
      #000 32%, rgba(0,0,0,.55) 66%, transparent 100%);
}
/* 常驻的冷白玻璃底光，静止时也有通透感 */
.glare__tint{
  position:absolute; inset:0;
  background:linear-gradient(158deg,
      rgba(226,240,255,.30) 0%,
      rgba(160,196,250,.14) 40%,
      transparent 64%);
}
/* 主高光条 */
.glare__sweep{
  position:absolute; top:-32%; bottom:-32%; left:0;
  width:52%;
  background:linear-gradient(100deg,
      transparent 0%,
      rgba(180,212,255,.10) 26%,
      rgba(214,233,255,.52) 43%,
      rgba(255,255,255,.92) 50%,
      rgba(206,229,255,.48) 57%,
      rgba(170,205,255,.08) 76%,
      transparent 100%);
  filter:blur(7px);
  transform:translateX(-150%) skewX(-14deg);
  animation:glassSweep var(--sweep-dur, 7s) cubic-bezier(.4,0,.28,1) infinite;
  will-change:transform,opacity;
}
/* 紧随其后的细亮线，玻璃特有的双高光 */
.glare__sweep--thin{
  width:16%;
  background:linear-gradient(100deg, transparent 0%,
      rgba(255,255,255,.92) 50%, transparent 100%);
  filter:blur(2.5px);
  opacity:.85;
  animation-delay:.24s;
}
@keyframes glassSweep{
  0%   { transform:translateX(-150%) skewX(-14deg); opacity:0; }
  9%   { opacity:1; }
  44%  { opacity:1; }
  60%  { transform:translateX(265%)  skewX(-14deg); opacity:0; }
  100% { transform:translateX(265%)  skewX(-14deg); opacity:0; }
}

/* 玻璃区域对齐辅助：网址后加 ?glass 打开 */
body.glass-guide .glare{
  mix-blend-mode:normal; opacity:1 !important;
  -webkit-mask-image:none !important; mask-image:none !important;
}
body.glass-guide .glare__band{
  outline:2px dashed #00E5FF;
  background:rgba(0,229,255,.16);
  -webkit-mask-image:none !important; mask-image:none !important;
}
body.glass-guide .glare__sweep,
body.glass-guide .glare__tint{ display:none; }

.car__shadow{
  position:absolute; left:5%; right:5%; bottom:44px;
  height:30px;
  background:radial-gradient(50% 50% at 50% 50%, rgba(10,14,18,.32), transparent 72%);
  filter:blur(10px);
  transform-origin:center;
  will-change:transform,opacity;
}
.car.is-placeholder img{ opacity:.92; }

.caliper{
  position:absolute; top:16%; bottom:15%;
  width:0; z-index:3; opacity:0;
  will-change:transform,opacity;
}
.caliper__line{
  position:absolute; top:54px; bottom:0; left:0; width:1px;
  background:linear-gradient(180deg, var(--blue), rgba(61,123,253,.08));
  box-shadow:0 0 14px rgba(61,123,253,.35);
}
.caliper__readout{
  position:absolute; top:0; left:14px;
  white-space:nowrap;
  display:flex; flex-direction:column; gap:2px;
}
.caliper__label{
  font-family:var(--font-en);
  font-size:9px; letter-spacing:.3em; color:var(--ink-3);
}
.caliper__value{
  font-family:var(--font-en);
  font-size:15px; letter-spacing:.06em; color:var(--blue);
}
.caliper__value b{ font-weight:600; font-variant-numeric:tabular-nums; }

.ruler{
  position:absolute; left:6vw; right:6vw;
  bottom:clamp(44px, 7vh, 74px);
  height:34px;
  display:flex; justify-content:space-between; align-items:flex-end;
  opacity:.5;
}
.ruler i{ width:1px; height:8px; background:rgba(16,21,27,.28); position:relative; }
.ruler i.tall{ height:16px; }
.ruler i.tall::after{
  content:attr(data-v);
  position:absolute; top:-18px; left:50%; transform:translateX(-50%);
  font-family:var(--font-en);
  font-size:9px; letter-spacing:.08em; color:var(--ink-3);
}

/* ============================================================
   SECTION 3 · 企业重点数据
   ============================================================ */
.data{
  position:relative;
  padding:clamp(120px, 16vh, 200px) var(--pad-x);
  background:linear-gradient(180deg, var(--bg) 0%, #EFF2F6 100%);
  overflow:hidden;
}
.data__canvas{ position:absolute; inset:0; width:100%; height:100%; opacity:.8; }
.data__inner{ position:relative; z-index:2; max-width:var(--max-w); margin:0 auto; }
.data__grid{ display:grid; grid-template-columns:repeat(4, 1fr); gap:0; }
.stat{
  padding:38px 34px 30px;
  border-left:1px solid var(--line);
  display:flex; flex-direction:column;
}
.stat:first-child{ border-left:0; }
.stat__en{
  font-family:var(--font-en);
  font-size:10px; font-weight:500; letter-spacing:.3em;
  color:var(--ink-3); margin-bottom:26px;
}
.stat__num{
  font-family:var(--font-en);
  font-size:clamp(46px, 5.4vw, 84px);
  font-weight:500; line-height:1; letter-spacing:-.01em;
  display:flex; align-items:flex-start;
  font-variant-numeric:tabular-nums;
}
.stat__num--code{ font-size:clamp(38px, 4.2vw, 62px); letter-spacing:.03em; }
.stat__suffix{
  font-style:normal; font-size:.44em;
  margin:.14em 0 0 .12em; color:var(--blue); font-weight:500;
}
.stat__label{
  margin-top:16px; font-size:14px; font-weight:300;
  letter-spacing:.1em; color:var(--ink-2);
}
.data__note{ margin-top:64px; font-size:11px; letter-spacing:.08em; color:var(--ink-3); }

/* ============================================================
   SECTION 4 · 企业宣传片
   ============================================================ */
.film{
  position:relative;
  background:#fff; color:#111;
  padding:clamp(110px, 15vh, 190px) var(--pad-x) clamp(130px, 17vh, 210px);
}
.film::before{
  content:""; position:absolute; inset:0 0 auto 0; height:40%;
  background:radial-gradient(60% 100% at 50% 0%, rgba(15,61,117,.035), transparent 70%);
  pointer-events:none;
}
.film .eyebrow--light{ color:rgba(17,17,17,.58); }
.film .ink--metal-light{
  color:#111;
  background:none;
  -webkit-background-clip:initial;
  background-clip:initial;
  -webkit-text-fill-color:#111;
}
.film__head{ max-width:var(--max-w); margin:0 auto 56px; }
.film__title{
  font-family:var(--font-display);
  font-size:clamp(38px, 4.8vw, 68px);
  font-weight:900; letter-spacing:.2em;
  margin-top:16px;
}
.film__frame{
  position:relative;
  max-width:min(1200px, 100%);
  margin:0 auto;
  aspect-ratio:16/9;
  border-radius:calc(var(--radius) + 4px);
  overflow:hidden; background:#000;
  box-shadow:
    0 40px 120px rgba(0,0,0,.55),
    0 0 0 1px rgba(255,255,255,.07),
    0 0 90px rgba(61,123,253,.10);
  cursor:pointer;
}
.film__poster{
  position:absolute; inset:0; width:100%; height:100%;
  object-fit:cover;
  transition:transform 1.4s var(--ease-out), opacity .6s;
}
.film__frame:hover .film__poster{ transform:scale(1.035); }
.film__vignette{
  position:absolute; inset:0;
  background:
    linear-gradient(0deg, rgba(0,0,0,.55), transparent 42%),
    radial-gradient(120% 100% at 50% 50%, transparent 55%, rgba(0,0,0,.35));
  transition:opacity .6s;
}
.film__play{
  position:absolute; z-index:3;
  left:50%; top:50%; transform:translate(-50%,-50%);
  width:88px; height:88px; border-radius:50%;
  color:#fff; display:grid; place-items:center;
  background:rgba(255,255,255,.10);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.35);
  transition:transform .4s var(--ease-out), background .4s, border-color .4s;
}
.film__play svg{ margin-left:4px; }
.film__play-ring{
  position:absolute; inset:-1px; border-radius:50%;
  border:1px solid rgba(255,255,255,.4);
  animation:ringPulse 2.6s ease-out infinite;
}
@keyframes ringPulse{
  0%{ transform:scale(1); opacity:.8; }
  70%,100%{ transform:scale(1.55); opacity:0; }
}
.film__frame:hover .film__play{
  transform:translate(-50%,-50%) scale(1.08);
  background:rgba(61,123,253,.28);
  border-color:rgba(122,163,255,.7);
}
.film__caption{
  position:absolute; z-index:3; left:28px; bottom:22px;
  font-size:13px; letter-spacing:.14em; color:rgba(255,255,255,.85);
}
.film__caption span{
  font-family:var(--font-en);
  font-size:10px; letter-spacing:.3em;
  color:rgba(255,255,255,.4); margin-left:14px;
}
.film__frame.is-playing{ cursor:default; }
.film__frame.is-playing .film__poster,
.film__frame.is-playing .film__vignette,
.film__frame.is-playing .film__play,
.film__frame.is-playing .film__caption{ display:none; }
.film__frame video{ position:absolute; inset:0; width:100%; height:100%; background:#000; }
.film__missing{
  position:absolute; inset:0; z-index:5;
  display:grid; place-items:center;
  background:rgba(0,0,0,.82);
  font-size:14px; letter-spacing:.06em;
  color:rgba(255,255,255,.75);
  text-align:center; padding:20px; line-height:2.2;
}
.film__missing b{ color:#fff; font-weight:500; }

/* ============================================================
   SECTION 5 · 企业导航（磨砂玻璃卡片 + 右上扇形配图）
   ============================================================ */
.explore{
  position:relative;
  padding:clamp(120px, 16vh, 200px) var(--pad-x) clamp(120px, 16vh, 190px);
  background:linear-gradient(180deg, #EFF2F6 0%, var(--bg) 30%, var(--bg-2) 100%);
  overflow:hidden;
}
.explore__aurora{ position:absolute; inset:0; pointer-events:none; }
.aurora{ position:absolute; border-radius:50%; filter:blur(70px); opacity:.8; will-change:transform; }
.aurora--a{
  width:46vw; height:46vw; left:-10vw; top:6%;
  background:radial-gradient(circle, rgba(61,123,253,.20), transparent 65%);
  animation:drift 26s ease-in-out infinite alternate;
}
.aurora--b{
  width:38vw; height:38vw; right:-8vw; top:32%;
  background:radial-gradient(circle, rgba(178,196,220,.5), transparent 65%);
  animation:drift 32s ease-in-out infinite alternate-reverse;
}
.aurora--c{
  width:30vw; height:30vw; left:32vw; bottom:-10%;
  background:radial-gradient(circle, rgba(255,255,255,.9), transparent 60%);
  animation:drift 24s ease-in-out infinite alternate;
}
@keyframes drift{
  from{ transform:translate(0,0) scale(1); }
  to{ transform:translate(9vw, -6vh) scale(1.18); }
}

.explore__inner{ position:relative; z-index:2; max-width:var(--max-w); margin:0 auto; }
.explore__heading{
  font-family:var(--font-display);
  font-size:clamp(38px, 4.8vw, 68px);
  font-weight:900; letter-spacing:.2em;
  margin:16px 0 58px;
}

.cards{ display:grid; grid-template-columns:repeat(6, 1fr); gap:18px; }
.card--w2{ grid-column:span 2; }
.card--w3{ grid-column:span 3; }

.card{
  position:relative;
  display:flex; flex-direction:column;
  --media-size:236px;
  min-height:252px;
  padding:30px 30px 26px;
  border-radius:var(--radius);
  background:linear-gradient(145deg, rgba(255,255,255,.62), rgba(255,255,255,.34));
  -webkit-backdrop-filter:blur(22px) saturate(1.5);
  backdrop-filter:blur(22px) saturate(1.5);
  border:1px solid rgba(255,255,255,.75);
  box-shadow:
    0 20px 50px rgba(23,32,44,.07),
    inset 0 1px 0 rgba(255,255,255,.9);
  transition:transform .5s var(--ease-out), box-shadow .5s var(--ease-out),
             border-color .5s, background .5s;
  overflow:hidden;
}
.card::before{
  content:""; position:absolute; left:0; right:0; top:0; height:1px; z-index:3;
  background:linear-gradient(90deg, transparent, rgba(61,123,253,.85), transparent);
  transform:translateX(-100%);
  transition:transform .9s var(--ease-out);
}
.card:hover{
  transform:translateY(-7px);
  border-color:rgba(61,123,253,.35);
  box-shadow:
    0 30px 70px rgba(23,32,44,.12),
    0 0 0 1px rgba(61,123,253,.10),
    0 0 60px rgba(61,123,253,.10),
    inset 0 1px 0 rgba(255,255,255,.95);
}
.card:hover::before{ transform:translateX(100%); }

/* —— 右上角 three.js 几何动画 —— */
.card__fx{
  position:absolute; top:0; right:0; z-index:0;
  width:var(--media-size); height:var(--media-size);
  pointer-events:none;
  opacity:.85;
  -webkit-mask-image:radial-gradient(circle closest-side at 68% 32%,
      #000 0%, #000 58%, rgba(0,0,0,.4) 80%, transparent 100%);
  mask-image:radial-gradient(circle closest-side at 68% 32%,
      #000 0%, #000 58%, rgba(0,0,0,.4) 80%, transparent 100%);
  transition:opacity .6s var(--ease-out);
}
.card:hover .card__fx{ opacity:1; }

/* 文字层压在动画之上 */
.card__en, .card__title, .card__desc, .card__arrow{ position:relative; z-index:2; }

.card__en{
  font-family:var(--font-en);
  font-size:10px; font-weight:500; letter-spacing:.32em;
  color:var(--ink-3);
  margin-bottom:auto;
}
.card__title{
  font-size:clamp(21px, 1.8vw, 26px);
  font-weight:600; letter-spacing:.12em;
  margin:44px 0 10px;
}
.card__desc{
  font-size:13px; font-weight:300; letter-spacing:.05em;
  color:var(--ink-2); line-height:1.9;
  padding-right:62px;
}
.card__arrow{
  position:absolute; right:22px; bottom:22px;
  width:40px; height:40px; border-radius:50%;
  display:grid; place-items:center;
  color:var(--ink-2);
  border:1px solid rgba(16,21,27,.14);
  background:rgba(255,255,255,.5);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  transition:all .4s var(--ease-out);
}
.card:hover .card__arrow{
  background:var(--blue); border-color:var(--blue); color:#fff;
  transform:translate(3px,-3px);
  box-shadow:0 8px 24px rgba(61,123,253,.4);
}

/* ---------------- 电影颗粒 ---------------- */
.grain{
  position:fixed; inset:-50%;
  z-index:999; pointer-events:none; opacity:.032;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grainShift 1.1s steps(4) infinite;
}
@keyframes grainShift{
  0%{ transform:translate(0,0); }
  25%{ transform:translate(-2%,1.6%); }
  50%{ transform:translate(1.4%,-1.8%); }
  75%{ transform:translate(-1.2%,-1%); }
  100%{ transform:translate(0,0); }
}

/* ============================================================
   首屏完整版视频弹层
   ============================================================ */
.hero-video-modal{
  position:fixed; inset:0; z-index:120;
  display:grid; place-items:center;
  padding:clamp(18px, 4vw, 56px);
  opacity:0; visibility:hidden; pointer-events:none;
  transition:opacity .28s ease, visibility .28s ease;
}
.hero-video-modal.is-open{ opacity:1; visibility:visible; pointer-events:auto; }
.hero-video-modal__backdrop{
  position:absolute; inset:0;
  background:rgba(5,9,14,.76);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.hero-video-modal__dialog{
  position:relative; z-index:1;
  width:min(1180px, 92vw);
  border:1px solid rgba(255,255,255,.14);
  border-radius:14px; overflow:hidden;
  background:#05080c;
  box-shadow:0 36px 90px rgba(0,0,0,.45);
  transform:translateY(10px) scale(.988);
  transition:transform .28s ease;
}
.hero-video-modal.is-open .hero-video-modal__dialog{ transform:none; }
.hero-video-modal__stage{ position:relative; aspect-ratio:16/9; background:#000; }
.hero-video-modal__stage video{ position:absolute; inset:0; width:100%; height:100%; object-fit:contain; background:#000; }
.hero-video-modal__close{
  position:absolute; top:12px; right:12px; z-index:3;
  width:38px; height:38px; display:grid; place-items:center;
  border:1px solid rgba(255,255,255,.24); border-radius:50%;
  background:rgba(5,9,14,.46); color:#fff;
  font-size:24px; line-height:1; cursor:pointer;
  -webkit-backdrop-filter:blur(8px); backdrop-filter:blur(8px);
  transition:background .2s ease, transform .2s ease;
}
.hero-video-modal__close:hover{ background:rgba(5,9,14,.76); transform:rotate(4deg); }
.hero-video-modal__missing{
  position:absolute; inset:0; display:grid; place-items:center;
  padding:30px; text-align:center; color:rgba(255,255,255,.7);
  font-size:13px; line-height:1.9;
}
body.is-video-modal-open{ overflow:hidden; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .cards{ grid-template-columns:repeat(2, 1fr); }
  .card--w2,.card--w3{ grid-column:span 1; }
  .data__grid{ grid-template-columns:repeat(2, 1fr); }
  .stat{ border-left:0; border-top:1px solid var(--line); padding:30px 18px 26px; }
  .stat:nth-child(-n+2){ border-top:0; }
  .stat:nth-child(even){ border-left:1px solid var(--line); }
}

@media (max-width:820px){
  .nav__links{ display:none; }
  .nav{ gap:16px; }
  .nav__cta{ margin-left:auto; }
  .brandmark__mark{ width:110px; height:31px; }
  #logoCanvas{ width:110px; height:31px; }
  .brandmark__cn{ font-size:15px; letter-spacing:.16em; }
  .brandmark__txt{ padding-left:8px; }

  .instruments{ height:220vh; }
  .instruments__title{ right:6vw; left:6vw; top:14vh; max-width:none; }
  .car{ left:4vw; width:min(92vw, 560px); bottom:16vh; }
  .car--production-sheet{ top:max(360px, 46vh); bottom:auto; width:92vw; aspect-ratio:4 / 3; }
  .car--production-sheet img{
    -webkit-mask-image:
      linear-gradient(to right, transparent 0%, #000 3%, #000 97%, transparent 100%),
      linear-gradient(to bottom, transparent 0%, #000 3%, #000 97%, transparent 100%);
    mask-image:
      linear-gradient(to right, transparent 0%, #000 3%, #000 97%, transparent 100%),
      linear-gradient(to bottom, transparent 0%, #000 3%, #000 97%, transparent 100%);
  }
  .instruments__pin:has(.car--production-sheet){ min-height:780px; }
  .car--production-sheet::before{ inset:-24px; filter:blur(18px); }
  .caliper__readout{ display:none; }
  .ruler i:nth-child(odd){ display:none; }

  .hero__full-video{ right:6vw; bottom:104px; }
  .instruments__cta{ margin-top:20px; }

  .film__caption{ left:16px; bottom:12px; font-size:11px; }
  .film__caption span{ display:none; }
  .film__play{ width:66px; height:66px; }

  .card, .card--w3{ --media-size:240px; }
  .card__desc{ padding-right:56px; }
}

@media (max-width:560px){
  .data__grid{ grid-template-columns:1fr; }
  .stat{ border-left:0 !important; border-top:1px solid var(--line); }
  .stat:first-child{ border-top:0; }
  .cards{ grid-template-columns:1fr; }
  .card, .card--w3{ --media-size:210px; }
  .hero__sub-divider{ width:24px; margin:0 10px; }
  .hero__full-video{ right:18px; bottom:88px; padding-right:10px; }
  .hero__full-video-en,.hero__full-video-arrow{ display:none; }
  .hero__full-video-copy{ min-width:0; }
  .brandmark__txt{ display:none; }
}

/* ============================================================
   降低动态效果偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001s !important;
    animation-iteration-count:1 !important;
    transition-duration:.001s !important;
  }
  .load-seq,[data-reveal]{ opacity:1 !important; transform:none !important; }
  .ink{ -webkit-clip-path:none !important; clip-path:none !important; }
  .glare__sweep{ display:none; }
  .rim--run{ display:none; }
  .car--production-sheet img,
  .car--production-sheet:hover img{ transform:none; transition:none; }
  .grain{ display:none; }
}

a:focus-visible, button:focus-visible{
  outline:2px solid var(--blue);
  outline-offset:3px;
  border-radius:4px;
}

/* ========================================================================== 
   v50 · 首页语言下拉（与内页 common.js 使用同一 DOM / 行为）
   ========================================================================== */
.home-lang-slot { flex: 0 0 auto; }
.home-language-dropdown { position: relative; z-index: 1200; }
.home-language-dropdown .language-dropdown__trigger {
  height: 36px;
  min-width: 96px;
  padding: 0 11px 0 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid rgba(255,255,255,.36);
  border-radius: 999px;
  background: rgba(11,22,34,.18);
  color: #fff;
  font: 600 12px/1 "Space Grotesk","Noto Sans SC",sans-serif;
  letter-spacing: .02em;
  white-space: nowrap;
  cursor: pointer;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background .2s ease,border-color .2s ease,color .2s ease;
}
.home-language-dropdown .language-dropdown__trigger i {
  font-style: normal;
  font-size: 11px;
  opacity: .72;
  transition: transform .2s ease;
}
.home-language-dropdown.is-open .language-dropdown__trigger i { transform: rotate(180deg); }
.nav.is-solid .home-language-dropdown .language-dropdown__trigger {
  color: var(--ink);
  border-color: rgba(16,21,27,.22);
  background: rgba(255,255,255,.72);
}
.home-language-dropdown .language-dropdown__menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  width: 228px;
  padding: 7px;
  border: 1px solid #dfe6ec;
  border-radius: 10px;
  background: #fff;
  color: #2e475d;
  box-shadow: 0 18px 44px rgba(9,28,45,.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-5px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.home-language-dropdown.is-open .language-dropdown__menu { opacity:1; visibility:visible; transform:translateY(0); }
.home-language-dropdown .language-dropdown__item {
  width: 100%; min-height: 48px; padding: 8px 10px;
  display:grid; grid-template-columns:1fr auto; grid-template-rows:auto auto;
  align-items:center; column-gap:8px; border:0; border-radius:7px;
  background:transparent; color:#2e475d; text-align:left; cursor:pointer;
  text-decoration:none; font-family:inherit;
}
.home-language-dropdown .language-dropdown__item + .language-dropdown__item { margin-top:2px; }
.home-language-dropdown .language-dropdown__item span { grid-column:1; font-size:13px; font-weight:600; }
.home-language-dropdown .language-dropdown__item small { grid-column:1; color:#8a99a6; font-size:10px; margin-top:2px; }
.home-language-dropdown .language-dropdown__item b { grid-column:2; grid-row:1 / 3; color:#2d76a8; font-size:12px; }
.home-language-dropdown .language-dropdown__item:hover { background:#f1f6fa; color:#155d98; }
.home-language-dropdown .language-dropdown__item.is-current { background:#edf5fb; color:#155d98; }
html[lang="en"] .hero__full-video-en { display:none; }

@media (max-width: 1000px) {
  .nav { gap: 12px; }
  .home-language-dropdown .language-dropdown__trigger { min-width: 88px; height: 34px; font-size: 11px; }
}
@media (max-width: 760px) {
  .nav__links { display:none; }
  .nav__cta { margin-left:auto; padding:8px 14px; font-size:11px; }
  .home-language-dropdown .language-dropdown__trigger { min-width:78px; height:32px; padding:0 8px; font-size:10px; }
  .home-language-dropdown .language-dropdown__menu { width:min(220px, calc(100vw - 28px)); right:-10px; }
}
@media (max-width: 430px) {
  .nav__cta { padding:7px 10px; letter-spacing:.06em; }
  .home-language-dropdown .language-dropdown__trigger { min-width:72px; }
}