/* ============ 基础变量（浅色主题） ============ */
:root{
  --bg:#ffffff;
  --bg-2:#f4f4f4;
  --text:#161616;
  --muted:#141414;
  --line:rgba(0,0,0,.10);
  --gold:#141414;
  --font:"Inter","Helvetica Neue","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;overflow-x:clip}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--gold);color:#fff}

/* ============ 预加载 ============ */
.preloader{position:fixed;inset:0;z-index:1000;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;transition:opacity .8s var(--ease),visibility .8s}
.preloader.done{opacity:0;visibility:hidden}
.preloader__logo{font-size:44px;font-weight:800;letter-spacing:.3em;color:var(--gold)}
.preloader__bar{width:220px;height:1px;background:var(--line);overflow:hidden}
.preloader__bar span{display:block;height:100%;width:0;background:var(--gold);transition:width .3s linear}
.preloader__num{font-size:12px;letter-spacing:.3em;color:var(--muted)}

/* ============ 背景 ============ */
#bgCanvas{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none;opacity:.22}

/* ============ 导航 ============ */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:26px 48px;transition:background .4s var(--ease),padding .4s var(--ease),box-shadow .4s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(255,255,255,.86);backdrop-filter:blur(14px);padding:16px 48px;border-bottom-color:var(--line);box-shadow:0 8px 30px rgba(0,0,0,.04)}
.nav__logo{display:flex;align-items:baseline;gap:10px}
.nav__mark{font-weight:800;letter-spacing:.18em;color:var(--gold);font-size:18px}
.nav__name{font-size:15px;font-weight:700;letter-spacing:.16em;color:#0a0a0a}
.nav__links{display:flex;gap:38px}
.nav__links a{font-size:13px;letter-spacing:.12em;color:var(--muted);position:relative;transition:color .3s}
.nav__links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;background:var(--gold);transition:width .35s var(--ease)}
.nav__links a:hover{color:var(--text)}
.nav__links a:hover::after{width:100%}
.nav__right{display:flex;align-items:center;gap:16px}
.nav__cta{font-size:12px;letter-spacing:.14em;padding:11px 22px;border:1px solid var(--gold);color:var(--gold);border-radius:2px;transition:background .3s,color .3s}
.nav__cta:hover{background:var(--gold);color:#fff}

/* 语言切换 */
.lang-toggle{display:flex;align-items:center;gap:7px;background:transparent;border:1px solid var(--line);color:var(--muted);font-family:inherit;font-size:11px;letter-spacing:.12em;padding:8px 12px;border-radius:2px;cursor:pointer;transition:border-color .3s}
.lang-toggle:hover{border-color:var(--gold)}
.lang-toggle i{font-style:normal;opacity:.35}
.lang-toggle span{transition:color .3s}
.lang-toggle span.is-active{color:var(--gold)}

/* ============ 逐字动画 ============ */
.split{display:inline-block}
.split .char{display:inline-block;opacity:0;transform:translateY(.65em) rotateX(-55deg);transform-origin:50% 100%;transition:opacity .75s var(--ease),transform .75s var(--ease);transition-delay:calc(var(--i) * 28ms)}
.split.in .char{opacity:1;transform:none}
.hero__title .split .char{transition-duration:.95s;transition-delay:calc(var(--i) * 55ms)}

/* ============ 通用 ============ */
.section{position:relative;z-index:2;padding:96px 48px;max-width:1680px;margin:0 auto}
.section__head{margin-bottom:70px}
.section__title{font-size:clamp(34px,4.4vw,64px);font-weight:700;letter-spacing:-.01em;line-height:1.08}
.section__desc{margin-top:18px;color:var(--muted);font-size:15px;max-width:520px}

[data-reveal]{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
[data-reveal].in{opacity:1;transform:none}

.btn{display:inline-flex;align-items:center;gap:10px;padding:15px 30px;font-size:13px;letter-spacing:.12em;border-radius:2px;transition:all .35s var(--ease);border:1px solid transparent}
.btn--primary{background:var(--text);color:#fff}
.btn--primary:hover{background:#333;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}

/* ============ 首屏 ============ */
.hero-wrap{position:relative;height:200vh}
.hero{position:sticky;top:0;z-index:2;height:100vh;display:flex;align-items:center;padding:0 48px}
.hero__media{position:absolute;inset:0;overflow:hidden}
.hero__photo{position:absolute;inset:-4%;background:url(assets/bg-hero.jpg) center/cover no-repeat;filter:blur(18px) saturate(.86) brightness(1.03);transform:scale(1.06)}
.hero__media::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.96) 0%,rgba(255,255,255,.88) 35%,rgba(255,255,255,.55) 62%,rgba(255,255,255,.12) 100%),linear-gradient(180deg,rgba(255,255,255,0) 55%,rgba(255,255,255,.92) 100%);pointer-events:none}
.hero__grid{position:absolute;inset:-20%;background-image:linear-gradient(rgba(0,0,0,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(0,0,0,.05) 1px,transparent 1px);background-size:80px 80px;opacity:.5;transform:perspective(600px) rotateX(56deg) translateY(12%);mask-image:radial-gradient(ellipse at 50% 30%,#000 10%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 10%,transparent 70%)}
.hero__glow{position:absolute;width:60vw;height:60vw;left:50%;top:20%;transform:translate(-50%,-50%);background:radial-gradient(circle,rgba(0,0,0,.045),transparent 60%);filter:blur(40px)}
.hero__inner{position:relative;z-index:3;max-width:1100px;padding-top:60px}
.hero__title{font-size:clamp(46px,8.6vw,132px);font-weight:800;line-height:.98;letter-spacing:-.02em}
.hero__title .line{display:block;overflow:hidden}
.hero__title .line > span{display:block}
.hero__sub{margin-top:34px;max-width:520px;color:var(--muted);font-size:16px;line-height:1.9}
.hero__actions{margin-top:44px;display:flex;gap:16px;flex-wrap:wrap}
.hero__scroll{position:absolute;bottom:38px;left:48px;font-size:10px;letter-spacing:.4em;color:var(--muted);display:flex;align-items:center;gap:14px}
.hero__scroll span{width:46px;height:1px;background:var(--gold);position:relative;overflow:hidden}
.hero__scroll span::after{content:"";position:absolute;inset:0;background:var(--text);animation:scrollLine 2.2s var(--ease) infinite}
.hero__line{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .15s linear}
@keyframes scrollLine{0%{transform:translateX(-100%)}60%,100%{transform:translateX(100%)}}

/* ============ 关于 ============ */
.about{position:relative;z-index:3;margin-top:-100vh}
.about::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:100vw;transform:translateX(-50%);background:var(--bg);z-index:-1}
.about__grid{display:grid;grid-template-columns:1fr;gap:56px;align-items:start}
.about__text p{color:var(--muted);font-size:16px;line-height:2;margin-bottom:22px;max-width:520px}
.link-arrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.12em;color:var(--gold);margin-top:12px}
.link-arrow span:last-child{transition:transform .3s var(--ease)}
.link-arrow:hover span:last-child{transform:translateX(6px)}
.about__stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.stat{background:var(--bg);padding:38px 34px;display:flex;flex-direction:column;gap:12px}
.stat strong{font-size:clamp(34px,3.6vw,52px);font-weight:700;color:var(--gold);letter-spacing:-.02em;white-space:nowrap}
.stat span{font-size:12px;letter-spacing:.18em;color:var(--muted)}

/* ============ 产品 ============ */
.products__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.product{background:var(--bg);overflow:hidden;transition:background .4s var(--ease)}
.product:hover{background:var(--bg-2)}
.product__media{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;overflow:hidden;color:var(--muted);font-size:12px;letter-spacing:.2em;background:linear-gradient(135deg,rgba(0,0,0,.025),transparent 55%),repeating-linear-gradient(45deg,rgba(0,0,0,.03) 0 1px,transparent 1px 14px);border-bottom:1px solid var(--line);transition:transform .9s var(--ease)}
.product:hover .product__media{transform:scale(1.03)}
.product__media img{width:100%;height:100%;object-fit:contain;padding:22%;box-sizing:border-box;display:block;transition:transform .9s var(--ease)}
.product:hover .product__media img{transform:scale(1.07)}
.product__body{padding:26px 28px 30px}
.product__body h3{font-size:19px;font-weight:600;margin-bottom:8px}
.product__body p{color:var(--muted);font-size:13px;letter-spacing:.04em}
.product__more{display:inline-block;margin-top:18px;font-size:11px;letter-spacing:.2em;color:var(--gold);opacity:0;transform:translateY(6px);transition:all .4s var(--ease)}
.product:hover .product__more{opacity:1;transform:none}

/* ============ 品质 ============ */
.quality__list{border-top:1px solid var(--line)}
.quality__item{display:grid;grid-template-columns:90px 1fr;gap:30px;padding:38px 0;border-bottom:1px solid var(--line);align-items:baseline}
.q-index{font-size:12px;letter-spacing:.2em;color:var(--gold)}
.quality__item h3{font-size:22px;font-weight:600;margin-bottom:8px}
.quality__item p{color:var(--muted);font-size:14px;line-height:1.8}

/* ============ 合作伙伴 ============ */

/* ============ 联系 ============ */
.contact{padding-bottom:180px}
.contact__title{font-size:clamp(38px,5.4vw,78px);font-weight:800;line-height:1.06;letter-spacing:-.02em;margin-bottom:70px}
.contact__grid{display:grid;grid-template-columns:1fr 1fr;gap:80px}
.contact__info p{display:flex;gap:24px;padding:20px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--text)}
.contact__info p span{min-width:60px;color:var(--muted);font-size:12px;letter-spacing:.2em}
.contact__info p b{font-weight:400}
.contact__form{display:flex;flex-direction:column;gap:14px}
.contact__form input,.contact__form textarea{background:transparent;border:1px solid var(--line);color:var(--text);padding:16px 18px;font-family:inherit;font-size:14px;border-radius:2px;outline:none;transition:border-color .3s}
.contact__form textarea{min-height:120px;resize:vertical}
.contact__form input:focus,.contact__form textarea:focus{border-color:var(--gold)}
.contact__form button{align-self:flex-start;margin-top:8px;cursor:pointer}

/* ============ 页脚 ============ */
.footer{position:relative;z-index:2;border-top:1px solid var(--line);padding:90px 48px 0;background:var(--bg-2)}
.footer__main{max-width:1680px;margin:0 auto;display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:44px;padding-bottom:70px}
.footer__logo{font-size:26px;font-weight:800;letter-spacing:.2em;color:var(--gold)}
.footer__tagline{margin-top:16px;color:var(--muted);font-size:13px;letter-spacing:.06em}
.footer__cta{display:inline-block;margin-top:26px;font-size:12px;letter-spacing:.18em;color:var(--gold);border-bottom:1px solid rgba(0,0,0,.22);padding-bottom:6px}
.footer__col h4{font-size:11px;letter-spacing:.26em;color:var(--gold);font-weight:600;margin-bottom:22px}
.footer__col a,.footer__col p{display:block;color:var(--muted);font-size:14px;line-height:1.4;margin-bottom:16px;transition:color .3s var(--ease)}
.footer__col a:hover{color:var(--text)}
.footer__bottom{max-width:1680px;margin:0 auto;border-top:1px solid var(--line);padding:26px 0 34px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;color:#141414;font-size:12px;letter-spacing:.06em}

/* ============ 智能检测设备 ============ */
.machines__grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}
.machine{padding:36px 36px;display:flex;flex-direction:column;border-right:1px solid var(--line)}
.machine:last-child{border-right:0}
.machine--flagship{background:#141414;color:#fff}
.machine__badge{align-self:flex-start;font-size:11px;letter-spacing:.2em;color:var(--gold);border:1px solid rgba(0,0,0,.28);padding:7px 13px;margin-bottom:24px}
.machine--flagship .machine__badge{color:#fff;border-color:rgba(255,255,255,.5)}
.machine h3{font-size:clamp(22px,2.2vw,30px);font-weight:700;margin-bottom:14px}
.machine__lead{font-size:14px;line-height:1.85;color:var(--muted);margin-bottom:22px;max-width:430px}
.machine--flagship .machine__lead{color:rgba(255,255,255,.62)}
.machine__specs{list-style:none;border-top:1px solid var(--line);margin-bottom:26px}
.machine--flagship .machine__specs{border-color:rgba(255,255,255,.14)}
.machine__specs li{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}
.machine--flagship .machine__specs li{border-color:rgba(255,255,255,.14)}
.machine__specs span{color:var(--muted);font-size:12px;letter-spacing:.12em;white-space:nowrap}
.machine--flagship .machine__specs span{color:rgba(255,255,255,.45)}
.machine__specs b{font-weight:500;text-align:right}
.machine__cta{margin-top:auto;align-self:flex-start}
.machine--flagship .btn--primary{background:var(--gold);color:#fff}
.machine--flagship .btn--primary:hover{background:#b07c36}
/* ============ 响应式 ============ */
@media(max-width:900px){
  .nav{padding:18px 22px}
  .nav__links{display:none}
  .section{padding:84px 22px}
  .hero{padding:0 22px}
  .hero__scroll{left:22px}
  .about__grid,.contact__grid{grid-template-columns:1fr;gap:50px}
  .products__grid{grid-template-columns:1fr 1fr}
  .footer{padding:70px 22px 0}
  .footer__main{grid-template-columns:1fr 1fr;gap:36px}
  .nav__right{gap:8px}
}
@media(max-width:560px){
  .products__grid{grid-template-columns:1fr}
  .about__stats{grid-template-columns:1fr}
  .footer__main{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;gap:10px}
  .nav__cta{display:none}
}



/* ============ 中间几屏背景（车间实拍） ============ */
.about::before{border-top:1px solid rgba(0,0,0,.22);box-shadow:0 -30px 60px rgba(0,0,0,.06)}

@media(max-width:900px){
  .machines__grid{grid-template-columns:1fr}
  .machine{border-right:0;border-bottom:1px solid var(--line)}
  .machine--flagship{border-bottom-color:rgba(255,255,255,.14)}
}

/* 设备图片位 */
.machine__media{height:clamp(130px,14vw,190px);margin:-36px -36px 26px;display:flex;align-items:center;justify-content:center;overflow:hidden;color:var(--muted);font-size:11px;letter-spacing:.24em;background:linear-gradient(135deg,rgba(0,0,0,.03),transparent 60%),repeating-linear-gradient(45deg,rgba(0,0,0,.035) 0 1px,transparent 1px 14px);border-bottom:1px solid var(--line)}
.machine--flagship .machine__media{color:rgba(255,255,255,.35);background:linear-gradient(135deg,rgba(255,255,255,.06),transparent 60%),repeating-linear-gradient(45deg,rgba(255,255,255,.035) 0 1px,transparent 1px 14px);border-bottom-color:rgba(255,255,255,.12)}
.machine__media img{width:100%;height:100%;object-fit:cover;display:block}
@media(max-width:900px){
  .machine{padding:36px 26px}
  .machine__media{margin:-36px -26px 26px}
}
.about{min-height:100vh}

/* ============ 品牌标识 ============ */
.nav__logo{display:flex;align-items:center;gap:12px}
.nav__logo-img{height:34px;width:auto;display:block}
.footer__logo-img{height:52px;width:auto;display:block;margin-bottom:14px}
.footer__name{font-size:14px;font-weight:600;letter-spacing:.08em;color:var(--text);margin-bottom:8px}
.preloader__logo-img{height:76px;width:auto;display:block}
.contact__wechat{margin-top:32px;display:flex;align-items:center;gap:18px}
.contact__wechat img{width:124px;height:124px;object-fit:cover;border:1px solid var(--line);background:#fff}
.contact__wechat span{font-size:12px;letter-spacing:.12em;color:var(--muted);line-height:1.7}

/* ============ 联系区（居中 + 社交二维码） ============ */
.contact__info{max-width:780px;margin:0 auto}
.contact__info p{justify-content:center}
.socials{display:flex;justify-content:center;gap:18px;margin-top:48px}
.social{position:relative}
.social__btn{width:56px;height:56px;border-radius:50%;border:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text);font-family:inherit;transition:border-color .3s,transform .3s,box-shadow .3s}
.social__btn:hover{border-color:var(--gold);transform:translateY(-3px);box-shadow:0 10px 24px rgba(0,0,0,.08)}
.social__btn svg{width:26px;height:26px;fill:currentColor}
.social__btn b{font-size:15px;font-weight:700;letter-spacing:.04em}
.social__pop{position:absolute;bottom:calc(100% + 16px);left:50%;transform:translate(-50%,10px);background:#fff;border:1px solid var(--line);padding:12px 12px 10px;box-shadow:0 24px 60px rgba(0,0,0,.14);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;z-index:30}
.social:hover .social__pop,.social:focus-within .social__pop{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}
.social__pop img{width:170px;height:170px;object-fit:cover;display:block}
.social__pop span{display:block;text-align:center;font-size:11px;letter-spacing:.12em;color:var(--muted);margin-top:10px}

/* 联系区对齐修正 */
.contact__inner{text-align:center}
.contact__title{text-align:center}
.contact__info{display:grid;grid-template-columns:76px minmax(0,1fr);column-gap:26px;max-width:760px;margin:0 auto;text-align:left}
.contact__info p{display:contents}
.contact__info p span{display:block;padding:20px 0;border-bottom:1px solid var(--line)}
.contact__info p b{display:block;padding:20px 0;border-bottom:1px solid var(--line)}
.social__pop{width:198px;box-sizing:border-box}
.social__pop img{width:100%;height:auto;display:block;max-width:100%}
.socials{grid-column:1 / -1}

/* ============ 统一小圆角 ============ */
:root{--radius:8px}
.btn{border-radius:var(--radius)}
.nav__cta{border-radius:var(--radius)}
.lang-toggle{border-radius:var(--radius)}
.products__grid,.machines__grid,.about__stats{overflow:hidden;border-radius:var(--radius)}
.social__pop{border-radius:var(--radius)}


/* ============ 产品中心：大图 + 自动横向滚动 ============ */
.products__showcase{height:clamp(200px,28vh,300px);margin-bottom:36px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:12px;letter-spacing:.24em;background:linear-gradient(135deg,rgba(0,0,0,.025),transparent 60%),repeating-linear-gradient(45deg,rgba(0,0,0,.03) 0 1px,transparent 1px 16px)}
.products__showcase img{width:100%;height:100%;object-fit:cover;display:block}
.products__rail{overflow:hidden;padding-bottom:6px}
.products__track{display:flex;width:max-content;animation:railscroll 36s linear infinite}
.products__rail:hover .products__track{animation-play-state:paused}
.rail__set{display:flex;gap:18px;padding-right:18px}
@keyframes railscroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.products__rail .product{flex:0 0 300px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg);transition:box-shadow .3s var(--ease),transform .3s var(--ease)}
.products__rail .product:hover{background:var(--bg);box-shadow:0 14px 34px rgba(0,0,0,.08);transform:translateY(-3px)}
.products__rail .product__media{height:230px;aspect-ratio:auto;border-bottom:1px solid var(--line)}
.products__rail .product__model{font-size:17px;font-weight:600;letter-spacing:.1em;text-align:center;padding:20px 16px}

/* ============ 隐私提示条 ============ */
.privacy-bar{position:fixed;left:0;right:0;bottom:0;z-index:300;background:#fff;border-top:1px solid var(--line);box-shadow:0 -12px 34px rgba(0,0,0,.07);transform:translateY(101%);transition:transform .5s var(--ease),opacity .4s var(--ease)}
.privacy-bar.is-visible{transform:translateY(0)}
.privacy-bar.is-hidden{opacity:0;transform:translateY(101%);pointer-events:none}
.privacy-bar__inner{max-width:1680px;margin:0 auto;padding:16px 48px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.privacy-bar p{font-size:13px;line-height:1.6;color:#141414}
.privacy-bar__link{text-decoration:underline;text-underline-offset:3px;cursor:pointer}
.privacy-bar__btn{flex:0 0 auto;padding:10px 24px;border:1px solid #141414;border-radius:var(--radius);background:#141414;color:#fff;font-family:inherit;font-size:12px;letter-spacing:.12em;cursor:pointer;transition:background .3s}
.privacy-bar__btn:hover{background:#000}
@media(max-width:700px){
  .privacy-bar__inner{padding:14px 22px;flex-direction:column;align-items:flex-start;gap:12px}
  .privacy-bar__btn{align-self:flex-end}
}
.privacy-bar__actions{display:flex;gap:10px;flex:0 0 auto}
.privacy-bar__btn--ghost{background:#fff;color:#141414;border-color:#141414}
.privacy-bar__btn--ghost:hover{background:#f2f2f2}
@media(max-width:700px){.privacy-bar__actions{align-self:flex-end}}

/* ============ 整页吸附滚动 ============ */
html{scroll-snap-type:none;scroll-padding-top:0}
.hero-wrap,.about,.products,.machines,.quality,.contact{scroll-snap-align:start}
@media(max-height:850px){html{scroll-snap-type:y proximity}}
.footer{scroll-snap-align:end}

/* ============ 首屏螺帽动画 ============ */
.hero__media{background:radial-gradient(circle at 72% 46%,#f7f7f7 0%,#ffffff 62%)}
.hero__media::after{background:linear-gradient(90deg,rgba(255,255,255,.97) 0%,rgba(255,255,255,.9) 38%,rgba(255,255,255,.35) 62%,rgba(255,255,255,0) 100%),linear-gradient(180deg,rgba(255,255,255,0) 60%,rgba(255,255,255,.95) 100%)}

/* 首屏螺帽：实拍图 + 浮动 + 鼠标视差 */
.hero__media{background:#fff}
.hero__media::after{background:linear-gradient(90deg,rgba(255,255,255,.98) 0%,rgba(255,255,255,.95) 34%,rgba(255,255,255,.45) 58%,rgba(255,255,255,0) 100%),linear-gradient(180deg,rgba(255,255,255,0) 62%,rgba(255,255,255,.96) 100%)}

/* ============ 首屏螺帽（叠在虚化厂房上） ============ */
.hero__nut-wrap{position:absolute;right:5%;top:50%;z-index:2;transform:translateY(-50%);perspective:1400px;will-change:transform;pointer-events:none}
.hero__nut{display:block;width:min(42vw,560px);height:auto;animation:nutFloat 8s ease-in-out infinite}
@keyframes nutFloat{0%,100%{transform:translateY(-8px) scale(1)}50%{transform:translateY(10px) scale(1.035)}}