/* =========================================================
   中山市瑞声科技有限公司 — 静态官网
   极简高级工业风：深炭灰 + 哑光银 + 科技蓝
   ========================================================= */

:root{
  --bg:            #0E1114;
  --bg-2:          #13171B;
  --panel:         #171B21;
  --panel-2:       #1C2128;
  --line:          rgba(255,255,255,.08);
  --line-strong:   rgba(255,255,255,.16);
  --silver:        #C9CFD6;
  --silver-dim:    #8B939C;
  --text:          #E8EBEF;
  --text-dim:      #A2AAB4;
  --blue:          #2E7BFF;
  --blue-soft:     rgba(46,123,255,.14);
  --blue-glow:     rgba(46,123,255,.35);
  --radius:        4px;
  --nav-h:         76px;
  --ease:          cubic-bezier(.22,.61,.36,1);
  --maxw:          1440px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Inter","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;letter-spacing:.01em}
p{margin:0}
ul,ol,dl{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,4vw,64px)}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  height:52px;padding:0 30px;border-radius:2px;
  font-size:15px;font-weight:600;letter-spacing:.06em;
  transition:all .45s var(--ease);position:relative;overflow:hidden;
}
.btn--primary{background:linear-gradient(120deg,#2E7BFF,#1B5FE0);color:#fff;box-shadow:0 10px 30px rgba(46,123,255,.28)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 18px 44px rgba(46,123,255,.42)}
.btn--line{border:1px solid var(--line-strong);color:var(--text);backdrop-filter:blur(6px)}
.btn--line:hover{border-color:var(--blue);color:#fff;background:var(--blue-soft);transform:translateY(-3px)}
.btn--ghost{height:42px;padding:0 22px;border:1px solid var(--line-strong);color:var(--silver);font-size:14px}
.btn--ghost:hover{border-color:var(--blue);color:#fff;background:var(--blue-soft)}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  transition:background .5s var(--ease),border-color .5s var(--ease),backdrop-filter .5s var(--ease);
  border-bottom:1px solid transparent;
}
.nav.is-solid{
  background:rgba(14,17,20,.9);
  border-bottom-color:var(--line);
  backdrop-filter:blur(14px) saturate(140%);
}
.nav__inner{
  max-width:var(--maxw);height:100%;margin:0 auto;padding:0 clamp(20px,4vw,64px);
  display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand__logo{height:34px;width:auto;display:block}
.brand__mark{width:32px;height:32px;color:var(--blue);flex:none}
.brand__mark svg{width:100%;height:100%}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__text strong{font-size:17px;letter-spacing:.08em}
.brand__text em{font-style:normal;font-size:10px;letter-spacing:.22em;color:var(--silver-dim)}

.menu{display:flex;gap:6px}
.menu__link{
  position:relative;padding:10px 16px;font-size:15px;color:var(--silver);
  transition:color .4s var(--ease);
}
.menu__link::after{
  content:"";position:absolute;left:16px;right:16px;bottom:2px;height:1px;
  background:var(--blue);transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.menu__link:hover,.menu__link.is-active{color:#fff}
.menu__link:hover::after,.menu__link.is-active::after{transform:scaleX(1)}

.nav__cta{display:flex;align-items:center;gap:18px}

/* 语言切换 */
.lang{display:flex;align-items:center;gap:8px;margin-right:6px}
.lang__btn{
  white-space:nowrap;
  font-size:13px;letter-spacing:.12em;color:var(--silver-dim);padding:4px 2px;
  border-bottom:1px solid transparent;transition:color .4s var(--ease),border-color .4s var(--ease);
}
.lang__btn:hover{color:#fff}
.lang__btn.is-active{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}
.lang__sep{color:var(--line-strong);font-size:12px}
.burger{display:none;width:42px;height:42px;flex-direction:column;justify-content:center;gap:5px;align-items:flex-end}
.burger span{display:block;width:24px;height:1.5px;background:var(--silver);transition:all .4s var(--ease)}
.burger.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- 首屏 ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero__bg{position:absolute;inset:-12% 0 -12% 0;will-change:transform}
.hero__bg img{width:100%;height:100%;object-fit:cover;object-position:center}
.hero__mask{
  position:absolute;inset:0;
  background:
    linear-gradient(100deg,rgba(10,12,15,.88) 0%,rgba(10,12,15,.62) 42%,rgba(14,17,20,.18) 72%,rgba(14,17,20,.55) 100%),
    linear-gradient(0deg,rgba(14,17,20,.95) 0%,transparent 32%),
    radial-gradient(110% 80% at 78% 60%,rgba(46,123,255,.14),transparent 55%);
}
.hero__grain{
  position:absolute;inset:0;opacity:.35;mix-blend-mode:overlay;
  background-image:linear-gradient(var(--line) 1px,transparent 1px);
  background-size:100% 3px;
}
.hero__content{position:relative;z-index:3;padding-top:var(--nav-h);max-width:860px}
.hero__eyebrow{
  font-size:12px;letter-spacing:.28em;color:var(--blue);
  margin-bottom:26px;text-transform:uppercase;
}
.hero__title{
  font-size:clamp(28px,4.1vw,56px);font-weight:800;letter-spacing:.02em;
  margin-bottom:22px;line-height:1.22;
  text-shadow:0 6px 30px rgba(0,0,0,.5);
}
.hero__title .char{display:inline-block;opacity:0;transform:translateY(26px);animation:charIn .8s var(--ease) forwards}
@keyframes charIn{to{opacity:1;transform:translateY(0)}}
.hero__sub{font-size:clamp(16px,1.5vw,21px);color:var(--silver);margin-bottom:20px;letter-spacing:.02em}
.hero__lead{max-width:620px;color:var(--text-dim);font-size:15.5px;margin-bottom:40px}
.hero__actions{display:flex;gap:16px;flex-wrap:wrap}
.hero__product{
  position:absolute;right:-6vw;bottom:-12vh;z-index:1;
  width:min(43vw,690px);pointer-events:none;will-change:transform;
  filter:drop-shadow(0 60px 90px rgba(0,0,0,.7)) drop-shadow(0 0 60px rgba(46,123,255,.12));
  animation:heroIn 1.6s var(--ease) .35s both;
}
.hero__product img{width:100%;height:auto}
@keyframes heroIn{from{opacity:0;transform:translate3d(60px,40px,0) scale(.96)}to{opacity:1;transform:none}}
.hero__scroll{
  position:absolute;left:50%;bottom:34px;transform:translateX(-50%);z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-size:10px;letter-spacing:.3em;color:var(--silver-dim);
}
.hero__scroll span{display:block;width:1px;height:44px;background:linear-gradient(var(--blue),transparent);animation:scrollLine 2.2s var(--ease) infinite}
@keyframes scrollLine{0%{opacity:0;transform:scaleY(.2)}40%{opacity:1}100%{opacity:0;transform:scaleY(1)}}

/* ---------- 区块通用 ---------- */
.section{position:relative;padding:clamp(72px,9vw,140px) 0;scroll-margin-top:var(--nav-h)}
/* 独立页页头（产品中心） */
.page-hero{padding:calc(var(--nav-h) + clamp(48px,7vw,90px)) 0 clamp(44px,5vw,70px);background:radial-gradient(1100px 380px at 75% -20%,rgba(46,123,255,.12),transparent 60%),linear-gradient(180deg,var(--panel) 0%,var(--bg) 100%);border-bottom:1px solid var(--line)}
.page-hero .sec-head{margin-bottom:0;max-width:900px}
.page-hero .sec-head__title{font-size:clamp(34px,4.6vw,54px)}
.section--dark{background:var(--bg-2)}
.section--panel{background:linear-gradient(180deg,var(--panel) 0%,var(--bg-2) 100%)}
.section::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--line-strong) 30%,var(--line-strong) 70%,transparent);
}
.sec-head{max-width:820px;margin-bottom:clamp(40px,5vw,72px)}
.sec-head__tag{
  display:inline-block;font-size:11px;letter-spacing:.3em;color:var(--blue);
  padding:6px 0;border-bottom:1px solid var(--blue-soft);margin-bottom:20px;
}
.sec-head__title{font-size:clamp(26px,3.2vw,44px);margin-bottom:16px;letter-spacing:.02em}
.sec-head__title::after{
  content:"";display:block;width:56px;height:2px;margin-top:20px;
  background:linear-gradient(90deg,var(--blue),transparent);
}
.sec-head__desc{color:var(--text-dim);font-size:15.5px}

/* 滚动揭示 */
.reveal{opacity:0;transform:translateY(44px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- 数字与优势 ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:56px}
.stat{
  padding:36px 30px;background:linear-gradient(160deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);
  position:relative;overflow:hidden;transition:transform .6s var(--ease),border-color .6s var(--ease);
}
.stat::after{
  content:"";position:absolute;inset:0;opacity:0;
  background:radial-gradient(120% 100% at 0% 0%,var(--blue-soft),transparent 60%);
  transition:opacity .6s var(--ease);
}
.stat:hover{transform:translateY(-8px);border-color:rgba(46,123,255,.4)}
.stat:hover::after{opacity:1}
.stat__num{font-size:clamp(38px,4vw,60px);font-weight:800;color:#fff;letter-spacing:-.01em;line-height:1}
.stat__num i{font-style:normal;font-size:.42em;font-weight:600;color:var(--blue);margin-left:6px}
.stat__label{margin-top:14px;font-size:16px;font-weight:600;color:var(--silver)}
.stat__note{margin-top:6px;font-size:13.5px;color:var(--silver-dim)}

.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.adv{
  padding:32px 26px;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(255,255,255,.015);
  transition:transform .55s var(--ease),box-shadow .55s var(--ease),border-color .55s var(--ease),background .55s var(--ease);
  position:relative;overflow:hidden;
}
.adv::before{
  content:"";position:absolute;top:0;left:-100%;width:60%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.06),transparent);
  transition:left .9s var(--ease);
}
.adv:hover{transform:translateY(-10px) scale(1.015);box-shadow:0 26px 60px rgba(0,0,0,.5);border-color:rgba(46,123,255,.35);background:rgba(46,123,255,.045)}
.adv:hover::before{left:130%}
.adv__icon{width:40px;height:40px;color:var(--blue);margin-bottom:18px}
.adv__icon svg{width:100%;height:100%}
.adv h3{font-size:17px;margin-bottom:10px}
.adv p{font-size:14px;color:var(--text-dim)}

/* ---------- 产品预览卡 ---------- */
.preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pcard{
  display:block;position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);overflow:hidden;
  transition:transform .55s var(--ease),box-shadow .55s var(--ease),border-color .55s var(--ease);
}
.pcard::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(120deg,transparent 30%,rgba(46,123,255,.16),transparent 70%);
  opacity:0;transition:opacity .55s var(--ease);
}
.pcard:hover{transform:translateY(-12px);box-shadow:0 30px 64px rgba(0,0,0,.55);border-color:rgba(46,123,255,.4)}
.pcard:hover::after{opacity:1}
.pcard__media{aspect-ratio:1/1;overflow:hidden;background:#0B0E11}
.pcard__media img{width:100%;height:100%;object-fit:contain;transition:transform .8s var(--ease)}
.pcard:hover .pcard__media img{transform:scale(1.07)}
.pcard__body{padding:22px 22px 26px;position:relative;z-index:1}
.pcard__body h3{font-size:17px;margin-bottom:8px}
.pcard__body p{font-size:13.5px;color:var(--text-dim)}
.pcard__arrow{
  position:absolute;right:20px;bottom:20px;color:var(--blue);font-size:18px;
  opacity:0;transform:translateX(-8px);transition:all .5s var(--ease);
}
.pcard:hover .pcard__arrow{opacity:1;transform:translateX(0)}

/* ---------- 工厂实力 ---------- */
.factory{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}
.factory__media{position:relative;border:1px solid var(--line);overflow:hidden;border-radius:var(--radius);aspect-ratio:16/10}
.factory__media .fimg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transform:scale(1.05);transition:opacity .7s var(--ease),transform 1.4s var(--ease)}
.factory__media .fimg.active{opacity:1;transform:scale(1)}
.factory__badge{
  position:absolute;left:24px;bottom:24px;padding:16px 22px;
  background:rgba(14,17,20,.82);border:1px solid var(--line-strong);backdrop-filter:blur(8px);
}
.factory__badge strong{display:block;font-size:16px;letter-spacing:.06em}
.factory__badge span{font-size:12.5px;color:var(--silver-dim)}
.factory__list{display:flex;flex-direction:column;gap:14px}
.factory__list li{
  display:flex;gap:18px;padding:20px 22px;border-left:2px solid var(--line-strong);
  background:linear-gradient(90deg,rgba(255,255,255,.03),transparent);
  transition:border-color .5s var(--ease),transform .5s var(--ease),background .5s var(--ease);
}
.factory__list li:hover{border-left-color:var(--blue);transform:translateX(6px);background:linear-gradient(90deg,var(--blue-soft),transparent)}
.factory__list .idx{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:.1em;padding-top:2px}
.factory__list h4{font-size:16px;margin-bottom:6px}
.factory__list p{font-size:13.5px;color:var(--text-dim)}

/* ---------- LOGO 墙 ---------- */
.appwall{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.app-card{
  position:relative;margin:0;border:1px solid var(--line);overflow:hidden;cursor:default;
  background:var(--panel);transition:transform .55s var(--ease),box-shadow .55s var(--ease),border-color .55s var(--ease);
}
.app-card img{width:100%;aspect-ratio:3/2;object-fit:cover;filter:saturate(.8) brightness(.85);transition:transform .9s var(--ease),filter .6s var(--ease)}
.app-card:hover{transform:translateY(-10px);box-shadow:0 30px 64px rgba(0,0,0,.55);border-color:rgba(46,123,255,.45)}
.app-card:hover img{transform:scale(1.08);filter:saturate(1) brightness(1)}
.app-card::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(0deg,rgba(10,12,15,.9) 0%,rgba(10,12,15,.25) 45%,transparent 70%);
  pointer-events:none;
}
.app-card figcaption{
  position:absolute;left:22px;bottom:16px;z-index:1;
  font-size:16px;font-weight:700;letter-spacing:.08em;color:#fff;
  display:flex;align-items:center;gap:10px;
}
.app-card figcaption::before{
  content:"";width:18px;height:2px;background:var(--blue);
}

/* ---------- 关于 ---------- */
.about__intro{max-width:900px;margin-bottom:56px}
.about__intro p{font-size:16.5px;color:var(--text-dim);margin-bottom:18px}
.about__intro p:first-child{color:var(--silver);font-size:18px}
.about__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:64px}
.ab{padding:30px 26px;border-top:2px solid var(--line-strong);cursor:pointer;transition:border-color .5s var(--ease),transform .5s var(--ease),background .5s var(--ease)}
.ab:hover{border-top-color:var(--blue);transform:translateY(-6px)}
.ab.open{background:rgba(46,123,255,.05)}
.ab h3{font-size:17px;margin-bottom:12px;display:flex;align-items:center;gap:10px}
.ab__no{font-size:12px;color:var(--blue);letter-spacing:.1em}
.ab__plus{margin-left:auto;position:relative;width:14px;height:14px;flex:none;opacity:.55;transition:transform .45s var(--ease),opacity .3s}
.ab__plus::before,.ab__plus::after{content:"";position:absolute;background:currentColor;left:50%;top:50%}
.ab__plus::before{width:14px;height:1.5px;transform:translate(-50%,-50%)}
.ab__plus::after{width:1.5px;height:14px;transform:translate(-50%,-50%)}
.ab.open .ab__plus{transform:rotate(45deg);opacity:1;color:var(--blue)}
.ab p{font-size:14px;color:var(--text-dim)}
.ab__more{display:none;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line-strong);font-size:13.5px;line-height:1.75}
.ab.open .ab__more{display:block;animation:abMore .5s var(--ease)}
@keyframes abMore{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

.timeline__title{font-size:22px;margin-bottom:28px}
.timeline__list{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
.timeline__list li{position:relative;padding:26px 22px 0;border-left:1px solid var(--line)}
.timeline__list li::before{
  content:"";position:absolute;left:-5px;top:-5px;width:9px;height:9px;border-radius:50%;
  background:var(--blue);box-shadow:0 0 0 5px rgba(46,123,255,.16);
}
.timeline__list .year{display:inline-block;font-size:11px;letter-spacing:.18em;color:var(--blue);margin-bottom:10px}
.timeline__list h4{font-size:16px;margin-bottom:8px}
.timeline__list p{font-size:13.5px;color:var(--text-dim)}

/* ---------- 产品中心 ---------- */
.filters{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:40px}
.filter{
  height:44px;padding:0 26px;border:1px solid var(--line-strong);border-radius:2px;
  font-size:14px;color:var(--silver);transition:all .45s var(--ease);
}
.filter:hover{color:#fff;border-color:var(--blue);transform:translateY(-2px)}
.filter.is-active{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 8px 24px rgba(46,123,255,.3)}

.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.prod{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);overflow:visible;
  transition:opacity .5s var(--ease),transform .55s var(--ease),box-shadow .55s var(--ease),border-color .55s var(--ease);
}
.prod.is-out{opacity:0;transform:scale(.94) translateY(14px);pointer-events:none}
.prod:hover{transform:translateY(-12px) scale(1.02);box-shadow:0 32px 70px rgba(0,0,0,.6);border-color:rgba(46,123,255,.42);z-index:5}
.prod__media{aspect-ratio:1/1;overflow:hidden;background:#0B0E11;border-bottom:1px solid var(--line)}
.prod__media img{width:100%;height:100%;object-fit:contain;transition:transform .8s var(--ease)}
.prod:hover .prod__media img{transform:scale(1.08)}
.prod__body{padding:20px 22px 24px}
.prod__body h3{font-size:16.5px;margin-bottom:8px}
.prod__desc{font-size:13px;color:var(--text-dim);margin-bottom:14px}
.prod__spec{display:grid;gap:6px}
.prod__spec li{display:flex;justify-content:space-between;font-size:12.5px;color:var(--silver-dim);border-bottom:1px dashed var(--line);padding-bottom:5px}
.prod__spec b{color:var(--silver);font-weight:600}

/* hover 参数弹窗 */
.prod__pop{
  position:absolute;left:50%;bottom:calc(100% + 14px);transform:translate(-50%,10px);
  width:250px;padding:18px 20px;z-index:20;
  background:rgba(12,15,18,.97);border:1px solid rgba(46,123,255,.35);border-radius:var(--radius);
  box-shadow:0 24px 60px rgba(0,0,0,.7);
  opacity:0;pointer-events:none;transition:opacity .4s var(--ease),transform .4s var(--ease);
}
.prod:hover .prod__pop{opacity:1;transform:translate(-50%,0)}
.prod__pop::after{
  content:"";position:absolute;left:50%;bottom:-6px;width:10px;height:10px;transform:translateX(-50%) rotate(45deg);
  background:rgba(12,15,18,.97);border-right:1px solid rgba(46,123,255,.35);border-bottom:1px solid rgba(46,123,255,.35);
}
.prod__pop h4{font-size:13px;letter-spacing:.12em;color:var(--blue);margin-bottom:12px}
.prod__pop dl{display:grid;gap:8px}
.prod__pop .row{display:flex;justify-content:space-between;font-size:12.5px}
.prod__pop .row span{color:var(--silver-dim)}
.prod__pop .row b{color:#fff;font-weight:600}

/* ---------- 案例画廊 ---------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.gcard{
  position:relative;margin:0;border:1px solid var(--line);overflow:hidden;cursor:pointer;
  background:var(--panel);transition:transform .55s var(--ease),box-shadow .55s var(--ease),border-color .55s var(--ease);
}
.gcard img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .9s var(--ease),filter .6s var(--ease);filter:saturate(.85) brightness(.92)}
.gcard:hover{transform:translateY(-10px);box-shadow:0 30px 64px rgba(0,0,0,.55);border-color:rgba(46,123,255,.4)}
.gcard:hover img{transform:scale(1.08);filter:saturate(1) brightness(1)}
.gcard figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:18px 20px;
  display:flex;align-items:center;gap:12px;font-size:14.5px;font-weight:600;
  background:linear-gradient(0deg,rgba(10,12,15,.92),transparent);
}
.gcard figcaption span{font-size:11px;letter-spacing:.18em;color:var(--blue)}

/* 灯箱 */
.lightbox{
  position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;
  background:rgba(6,8,10,.94);backdrop-filter:blur(10px);
  opacity:0;pointer-events:none;transition:opacity .4s var(--ease);
}
.lightbox.is-open{opacity:1;pointer-events:auto}
.lightbox__stage{margin:0;max-width:88vw;max-height:82vh;display:flex;flex-direction:column;align-items:center;gap:18px}
.lightbox__stage img{max-width:88vw;max-height:72vh;object-fit:contain;border:1px solid var(--line)}
.lightbox__stage figcaption{font-size:15px;color:var(--silver);letter-spacing:.06em}
.lightbox__close{
  position:absolute;top:26px;right:30px;width:48px;height:48px;font-size:30px;line-height:1;
  color:var(--silver);border:1px solid var(--line-strong);border-radius:50%;transition:all .4s var(--ease);
}
.lightbox__close:hover{color:#fff;border-color:var(--blue);background:var(--blue-soft);transform:rotate(90deg)}
.lightbox__nav{
  position:absolute;top:50%;transform:translateY(-50%);width:56px;height:56px;font-size:32px;line-height:1;
  color:var(--silver);border:1px solid var(--line-strong);border-radius:50%;transition:all .4s var(--ease);
}
.lightbox__nav:hover{color:#fff;border-color:var(--blue);background:var(--blue-soft)}
.lightbox__nav--prev{left:clamp(16px,4vw,60px)}
.lightbox__nav--next{right:clamp(16px,4vw,60px)}
.lightbox__count{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);font-size:13px;letter-spacing:.2em;color:var(--silver-dim)}

/* ---------- 联系 ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact__info dl{display:grid;gap:0;margin-bottom:38px}
.contact__info dl div{
  display:grid;grid-template-columns:120px 1fr;gap:20px;padding:16px 0;border-bottom:1px solid var(--line);
}
.contact__info dt{font-size:13px;letter-spacing:.14em;color:var(--silver-dim)}
.contact__info dd{margin:0;font-size:15.5px;color:var(--text)}
.contact__info dd.hl{color:var(--blue);font-weight:700;letter-spacing:.04em}
.contact__info dd.hl a{color:inherit;text-decoration:none;transition:opacity .35s var(--ease)}
.contact__info dd.hl a:hover{opacity:.72;text-decoration:underline;text-underline-offset:4px}

.qr-row{display:flex;gap:16px;flex-wrap:wrap}
.qr{display:inline-flex;flex-direction:column;align-items:center;gap:14px;padding:22px 26px;border:1px solid var(--line-strong);background:rgba(255,255,255,.02);transition:transform .5s var(--ease),border-color .5s var(--ease)}
.qr:hover{transform:translateY(-5px);border-color:var(--blue)}
.qr__img{width:180px;height:180px;padding:10px;background:#fff;border-radius:2px}
.qr__img img{width:100%;height:100%;object-fit:contain}
.qr__text{font-size:13.5px;color:var(--silver);letter-spacing:.04em;text-align:center}

.contact__map{position:relative;border:1px solid var(--line);overflow:hidden}
.contact__map img{width:100%;aspect-ratio:4/3;object-fit:cover;filter:grayscale(.35) brightness(.9) contrast(1.05)}
.contact__pin{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)}
.contact__pin span{
  display:inline-flex;align-items:center;gap:8px;padding:10px 18px;white-space:nowrap;
  background:rgba(14,17,20,.9);border:1px solid rgba(46,123,255,.5);font-size:13.5px;
}
.contact__pin span::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 6px var(--blue-soft)}

/* ---------- 页脚 ---------- */
.footer{background:#0A0C0F;border-top:1px solid var(--line);padding:44px 0}
.footer__inner{display:flex;flex-wrap:wrap;align-items:center;gap:24px;justify-content:space-between}
.footer__brand{display:flex;flex-direction:column}
.footer__brand strong{font-size:16px;letter-spacing:.06em}
.footer__brand span{font-size:12px;color:var(--silver-dim);letter-spacing:.06em}
.footer__nav{display:flex;flex-wrap:wrap;gap:22px;font-size:14px;color:var(--silver-dim)}
.footer__nav a:hover{color:var(--blue)}
.footer__copy{width:100%;padding-top:20px;border-top:1px solid var(--line);font-size:12.5px;color:var(--silver-dim)}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .preview-grid,.prod-grid,.gallery,.adv-grid,.about__grid{grid-template-columns:repeat(3,1fr)}
  .appwall{grid-template-columns:repeat(4,1fr)}
  .timeline__list{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:1024px){
  .menu{
    position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;gap:0;
    background:rgba(14,17,20,.98);border-bottom:1px solid var(--line);
    padding:10px 0;transform:translateY(-12px);opacity:0;pointer-events:none;
    transition:all .4s var(--ease);backdrop-filter:blur(12px);
  }
  .menu.is-open{transform:none;opacity:1;pointer-events:auto}
  .menu__link{padding:14px clamp(20px,4vw,64px);border-bottom:1px solid rgba(255,255,255,.05)}
  .burger{display:flex}
  .nav__cta{display:flex;gap:10px}
  .nav__cta .btn--ghost{display:none}
  .lang__btn{font-size:12px}
  .factory{grid-template-columns:1fr}
  .hero__product{right:-18vw;bottom:-4vh;width:88vw;opacity:.4}
  .contact{grid-template-columns:1fr}
}
@media (max-width:860px){
  .stats{grid-template-columns:1fr}
  .preview-grid,.prod-grid,.gallery,.adv-grid,.about__grid{grid-template-columns:repeat(2,1fr)}
  .appwall{grid-template-columns:repeat(2,1fr)}
  .prod__pop{display:none}
  .lightbox__stage img{max-height:60vh}
}
@media (max-width:600px){
  .hero__title{font-size:26px}
  .hero__product{right:-26vw;bottom:-2vh;width:110vw;opacity:.35}
  .preview-grid,.prod-grid,.gallery,.adv-grid,.about__grid,.timeline__list{grid-template-columns:1fr}
  .appwall{grid-template-columns:repeat(2,1fr)}
  .stat{padding:26px 22px}
  .btn{height:48px;padding:0 22px;font-size:14px}
  .contact__info dl div{grid-template-columns:1fr;gap:4px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
  html{scroll-behavior:auto}
}

/* =========================================================
   产品中心 v2：分组标题 / 徽标 / 详情链接
   ========================================================= */
.prod-group{
  grid-column:1/-1;display:flex;align-items:center;gap:14px;
  padding:26px 0 2px;margin-top:8px;
  font-size:15px;font-weight:700;letter-spacing:.18em;color:var(--silver);
}
.prod-group::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line-strong),transparent)}
.prod__media{display:block}
.prod__badge{
  position:absolute;top:12px;left:12px;z-index:2;
  padding:4px 12px;border-radius:2px;
  background:rgba(10,13,16,.78);border:1px solid var(--line-strong);
  backdrop-filter:blur(6px);
  font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--text);
}
.prod__type{font-size:12.5px;letter-spacing:.1em;color:var(--blue);margin-bottom:12px}
.prod__model a:hover{color:var(--blue)}
.prod__more{
  display:inline-flex;align-items:center;gap:6px;margin-top:16px;
  font-size:12.5px;letter-spacing:.12em;color:var(--silver-dim);
  transition:color .3s var(--ease);
}
.prod__more::after{content:"→";transition:transform .3s var(--ease)}
.prod__more:hover{color:var(--blue)}
.prod__more:hover::after{transform:translateX(5px)}

/* =========================================================
   产品详情页
   ========================================================= */
.page-hero--slim{padding:calc(var(--nav-h) + clamp(40px,5vw,64px)) 0 clamp(30px,3.5vw,46px)}
.crumbs{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--silver-dim);margin-bottom:14px}
.crumbs a:hover{color:var(--blue)}
.crumbs b{color:var(--text);font-weight:600}
.pd-title{font-size:clamp(34px,4.4vw,52px);letter-spacing:.04em}
.pd-sub{margin-top:8px;font-size:15px;letter-spacing:.14em;color:var(--blue)}

.pd-sec{padding:clamp(40px,5vw,64px) 0}
.pd-h2{font-size:clamp(20px,2.2vw,26px);margin-bottom:22px;padding-left:14px;border-left:3px solid var(--blue)}
.pd-h2--gap{margin-top:46px}
.pd-h3{font-size:15px;letter-spacing:.14em;color:var(--blue);margin:26px 0 12px}

.pd-main{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(24px,3.5vw,52px);align-items:start}
.pd-gallery__main{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;aspect-ratio:1/1;
}
.pd-gallery__main img{width:100%;height:100%;object-fit:contain}
.pd-thumbs{display:flex;gap:12px;margin-top:14px}
.pd-thumb{
  width:86px;height:86px;padding:6px;border:1px solid var(--line);
  border-radius:var(--radius);background:#fff;opacity:.55;
  transition:opacity .3s var(--ease),border-color .3s var(--ease);
}
.pd-thumb img{width:100%;height:100%;object-fit:contain}
.pd-thumb.is-active{opacity:1;border-color:var(--blue)}
.pd-keys{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.pd-key{
  padding:20px 18px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);transition:border-color .3s var(--ease);
}
.pd-key:hover{border-color:rgba(46,123,255,.4)}
.pd-key span{display:block;font-size:12px;letter-spacing:.1em;color:var(--silver-dim);margin-bottom:8px}
.pd-key b{font-size:clamp(16px,1.6vw,20px);color:var(--text);font-weight:700;word-break:break-word}

.ts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.ts-cell{
  padding:18px 16px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);text-align:center;
}
.ts-cell span{display:block;font-size:13px;letter-spacing:.12em;color:var(--blue);margin-bottom:6px;font-weight:600}
.ts-cell b{font-size:16px;color:var(--text)}

.pd-table{width:100%;border-collapse:collapse;border:1px solid var(--line)}
.pd-table th,.pd-table td{
  padding:13px 18px;border-bottom:1px solid var(--line);
  font-size:13.5px;text-align:left;vertical-align:top;
}
.pd-table tr:last-child th,.pd-table tr:last-child td{border-bottom:0}
.pd-table th{width:220px;font-weight:600;color:var(--silver-dim);letter-spacing:.04em;background:rgba(255,255,255,.02)}
.pd-table td{color:var(--text)}

.pd-note{margin-top:16px;font-size:12.5px;color:var(--silver-dim)}
.pd-curve{
  margin:0;padding:22px;border:1px solid var(--line);border-radius:var(--radius);
  background:#fff;
}
.pd-curve img{width:100%;height:auto}

.pd-cta{background:radial-gradient(900px 300px at 50% 0%,rgba(46,123,255,.14),transparent 60%),var(--bg-2)}
.pd-cta__inner{text-align:center}
.pd-cta__inner h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:26px}
.pd-cta__btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

@media (max-width:900px){
  .pd-main{grid-template-columns:1fr}
  .pd-table th{width:150px}
}

/* =========================================================
   独立联系页 / 首页联系入口
   ========================================================= */
.ct-call{margin-bottom:32px}
.contact .qr-row{margin-top:4px}

.section.contact-cta{
  padding:clamp(46px,5.5vw,80px) 0;
  border-top:1px solid var(--line);
  background:radial-gradient(900px 320px at 85% 0%,rgba(46,123,255,.13),transparent 62%),var(--panel);
}
.contact-cta__inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.contact-cta__inner h2{font-size:clamp(24px,3vw,36px);margin-bottom:12px;letter-spacing:.02em}
.contact-cta__inner p{color:var(--text-dim);font-size:15.5px}
.contact-cta__actions{display:flex;gap:14px;flex-wrap:wrap}
@media (max-width:700px){
  .contact-cta__inner{flex-direction:column;align-items:flex-start;gap:24px}
}

/* =========================================================
   首页产品预览：4 卡布局
   ========================================================= */
.section .preview-grid{grid-template-columns:repeat(4,1fr)}
@media (max-width:1200px){
  .preview-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:600px){
  .preview-grid{grid-template-columns:1fr}
}

/* =========================================================
   首屏背景视频
   ========================================================= */
.hero__bg .hero__video{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;object-position:center;
  opacity:0;transition:opacity 1.4s var(--ease);
}
.hero__bg.hero__bg--video .hero__video{opacity:1}

/* 轻量模式（微信 / 手机 / 省流量）：只显示视频封面帧，不下载视频 */
.hero__bg--poster img#heroPoster{display:none}
.hero__bg--poster .hero__video{opacity:1}

/* 视频/封面背景略亮，文字区整体加深保证可读性 */
.hero__bg.hero__bg--video ~ .hero__mask,
.hero__bg.hero__bg--poster ~ .hero__mask{
  background:
    linear-gradient(100deg,rgba(10,12,15,.92) 0%,rgba(10,12,15,.78) 42%,rgba(14,17,20,.42) 72%,rgba(14,17,20,.62) 100%),
    linear-gradient(0deg,rgba(14,17,20,.95) 0%,transparent 40%),
    radial-gradient(110% 80% at 78% 60%,rgba(46,123,255,.12),transparent 55%);
}