/* ============================================================
   云链之路 · 企业官网
   形式：满屏翻页（scroll-snap + 逐屏入场动画）
   视觉：云链青（#01c2c3）× 瓷白 × 墨青　字体：微软雅黑
   ============================================================ */

:root{
  --brand:#01c2c3;
  --brand-2:#00a9ab;
  --brand-l:#4ad6d7;
  --brand-pale:#d9f6f6;
  --brand-soft:rgba(1,194,195,.09);

  --porcelain:#f7fafb;
  --porcelain-2:#eef5f6;
  --porcelain-3:#e2ecee;
  --line:rgba(0,80,82,.14);
  --line-2:rgba(0,80,82,.24);

  --ink:#1a2b2d;
  --ink-2:#3a4f52;
  --ink-3:#6f8588;
  --deep:#0f3436;

  --shadow:0 20px 54px -30px rgba(15,52,54,.6);
  --sans:"Microsoft YaHei","微软雅黑","PingFang SC","Hiragino Sans GB","Noto Sans SC",sans-serif;
  --wrap:1200px;
  --header-h:78px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  /* 满屏翻页核心 */
  scroll-snap-type:y mandatory;
  scroll-padding-top:0;
}
body{
  font-family:var(--sans);
  font-weight:400;
  color:var(--ink);
  background:var(--porcelain);
  line-height:1.9;
  font-size:16px;
  overflow-x:hidden;
  background-image:
    radial-gradient(ellipse at 22% 8%,rgba(1,194,195,.07),transparent 45%),
    radial-gradient(ellipse at 84% 84%,rgba(0,169,171,.06),transparent 46%);
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
h1,h2,h3{font-family:var(--sans);font-weight:700;letter-spacing:.03em;line-height:1.45}
.wrap{width:min(var(--wrap),92vw);margin-inline:auto}

/* ---------------- 导航（起始透明浮于深色首屏之上） ---------------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  background:transparent;
  backdrop-filter:none;-webkit-backdrop-filter:none;
  border-bottom:1px solid transparent;
  transition:box-shadow .3s,background .3s,border-color .3s;
}
.site-header.is-scrolled{
  background:rgba(247,250,251,.94);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
  box-shadow:0 10px 30px -24px rgba(15,52,54,.6);
}
/* 顶部未滚动时反白文字 */
.brand-cn,.nav-link{transition:color .3s}
.site-header:not(.is-scrolled) .brand-cn{color:#fff}
.site-header:not(.is-scrolled) .brand-en{color:rgba(216,238,239,.7)}
.site-header:not(.is-scrolled) .nav-link{color:rgba(216,238,239,.88)}
.site-header:not(.is-scrolled) .nav-link:hover,
.site-header:not(.is-scrolled) .nav-link.is-active{color:var(--brand-l)}
.site-header:not(.is-scrolled) .nav-toggle{border-color:rgba(255,255,255,.3)}
.site-header:not(.is-scrolled) .nav-toggle span{background:#fff}
.header-inner{
  width:min(var(--wrap),92vw);margin-inline:auto;display:flex;align-items:center;
  justify-content:space-between;gap:20px;height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-logo{flex-shrink:0;line-height:0}
.brand-logo img{width:44px;height:44px;object-fit:contain}
.brand-text{display:flex;flex-direction:column;line-height:1.3}
.brand-cn{font-size:21px;font-weight:700;letter-spacing:.1em;color:var(--ink)}
.brand-en{font-size:10px;letter-spacing:.28em;color:var(--ink-3)}

.nav{display:flex;align-items:center;gap:4px}
.nav-link{
  position:relative;padding:9px 15px;font-size:15px;color:var(--ink-2);
  font-weight:700;letter-spacing:.05em;border-radius:2px;transition:color .25s;
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:2px;width:0;height:2px;
  background:var(--brand);transform:translateX(-50%);transition:width .28s;
}
.nav-link:hover{color:var(--brand-2)}
.nav-link.is-active{color:var(--brand-2)}
.nav-link.is-active::after{width:calc(100% - 28px)}

.nav-toggle{display:none;width:42px;height:42px;background:none;border:1px solid var(--line);border-radius:2px;cursor:pointer;padding:11px 10px}
.nav-toggle span{display:block;height:1.6px;background:var(--ink);margin:4px 0;transition:.3s}

/* ---------------- 进度条 ---------------- */
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:110;background:rgba(0,80,82,.08)}
.progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--brand),var(--brand-l));
  transition:width .18s linear;
}

/* ---------------- 右侧翻页指示器 ---------------- */
.dots{
  position:fixed;right:26px;top:50%;transform:translateY(-50%);z-index:95;
  display:flex;flex-direction:column;gap:4px;
}
.dots button{
  display:flex;align-items:center;gap:10px;background:none;border:0;cursor:pointer;
  padding:6px 0;color:var(--ink-3);font-family:var(--sans);font-size:12px;
  letter-spacing:.06em;transition:.3s;
}
.dots .dot-mark{
  width:9px;height:9px;border-radius:50%;border:1.5px solid var(--ink-3);
  transition:.3s;flex-shrink:0;
}
.dots .dot-label{
  opacity:0;transform:translateX(6px);transition:.3s;white-space:nowrap;
  background:rgba(247,250,251,.9);padding:2px 8px;border-radius:2px;
}
.dots button:hover .dot-label{opacity:1;transform:none}
.dots button.is-active{color:var(--brand-2)}
.dots button.is-active .dot-mark{
  background:var(--brand);border-color:var(--brand);
  box-shadow:0 0 0 4px rgba(1,194,195,.18);
}
.dots button.is-active .dot-label{opacity:1;transform:none;color:var(--brand-2)}
.dots.on-dark button{color:rgba(210,235,236,.7)}
.dots.on-dark .dot-mark{border-color:rgba(210,235,236,.7)}
.dots.on-dark button.is-active{color:var(--brand-l)}
.dots.on-dark button.is-active .dot-mark{border-color:var(--brand-l)}
.dots.on-dark .dot-label{background:rgba(15,52,54,.85);color:#e2f2f3}

/* ---------------- 满屏翻页：幻灯片 ---------------- */
.deck{position:relative}
.slide{
  position:relative;
  min-height:100vh;      /* 兜底：不支持 svh 的浏览器 */
  min-height:100svh;
  scroll-snap-align:start;
  scroll-snap-stop:always;
  display:flex;flex-direction:column;justify-content:center;
  padding:calc(var(--header-h) + 28px) 0 56px;
  overflow:hidden;
}
.slide-inner{
  position:relative;z-index:3;
  width:min(var(--wrap),92vw);margin-inline:auto;
}
.slide-inner--narrow{width:min(var(--wrap),92vw)}

/* 幻灯片背景（统一走 .sec-bg 体系） */
.sec-bg{position:absolute;inset:0;overflow:hidden}
.sec-bg img{width:100%;height:100%;object-fit:cover}

/* 深色幻灯片 */
.has-bg{background:var(--deep)}
.has-bg .sec-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,52,54,.9),rgba(15,52,54,.86))}
.has-bg .section-title,.has-bg h3{color:#fff}
.has-bg .section-sub{color:rgba(220,240,241,.75)}

/* 逐元素入场动画 */
[data-anim]{
  opacity:0;
  transform:translateY(34px);
  transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);
  transition-delay:calc(var(--i,0) * 90ms);
}
.slide.is-active [data-anim]{opacity:1;transform:none}

/* 离开时复位，让每次翻回来都重播 */
.slide.is-prev [data-anim],.slide:not(.is-active):not(.is-prev) [data-anim]{
  opacity:0;transform:translateY(34px);
}

/* ---------------- 首屏（深底，文字反白） ---------------- */
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:13.5px;letter-spacing:.2em;
  color:var(--brand-l);border:1px solid rgba(74,214,215,.4);background:rgba(255,255,255,.06);
  padding:7px 18px;border-radius:2px;margin-bottom:26px;font-weight:700;
}
.hero-eyebrow .dot{width:6px;height:6px;background:var(--brand-l);border-radius:50%;box-shadow:0 0 0 4px rgba(74,214,215,.2)}
.hero-title{margin-bottom:20px}
.seal{
  display:inline-block;font-size:clamp(52px,9.4vw,108px);
  font-weight:700;letter-spacing:.12em;line-height:1.08;color:#fff;
  text-shadow:0 2px 18px rgba(0,0,0,.4);
}
.hero-slogan{
  font-size:clamp(20px,2.6vw,30px);font-weight:700;letter-spacing:.14em;
  color:var(--brand-l);margin-bottom:26px;
}
.hero-slogan::before{content:"";display:inline-block;width:46px;height:2px;background:var(--brand-l);vertical-align:middle;margin-right:14px}
.hero-desc{max-width:620px;color:rgba(216,238,239,.86);font-size:16.5px}
.hero-actions{display:flex;gap:14px;margin:34px 0 22px;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 32px;font-size:15.5px;font-weight:700;letter-spacing:.1em;
  border-radius:2px;cursor:pointer;border:1px solid transparent;transition:.28s;
}
.btn-solid{background:var(--brand);color:#fff;box-shadow:0 14px 30px -14px rgba(0,0,0,.7)}
.btn-solid:hover{background:var(--brand-2);transform:translateY(-2px)}
.btn-ghost{border-color:rgba(74,214,215,.6);color:var(--brand-l);background:rgba(255,255,255,.06)}
.btn-ghost:hover{background:var(--brand);color:#fff;border-color:var(--brand);transform:translateY(-2px)}

.slide-cue{
  position:absolute;left:50%;bottom:20px;transform:translateX(-50%);z-index:4;
  font-size:11.5px;letter-spacing:.24em;color:rgba(200,230,231,.66);
  display:flex;flex-direction:column;align-items:center;gap:8px;
}
.slide-cue span{width:1px;height:34px;background:linear-gradient(var(--brand-l),transparent);animation:drop 1.9s infinite}
@keyframes drop{0%{transform:scaleY(.2);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(.2);transform-origin:bottom}}

/* ---------------- 公司简介 ---------------- */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(30px,5vw,64px);align-items:center}
.about-text .lead{font-size:19px;font-weight:700;color:var(--ink);margin-bottom:18px}
.about-text p{color:var(--ink-2);margin-bottom:16px}
.about-text strong{color:var(--brand-2);border-bottom:1px solid var(--brand-l);padding-bottom:1px}
.about-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}
.stat{
  border:1px solid var(--line);background:rgba(255,255,255,.66);padding:18px 14px;text-align:center;border-radius:2px;transition:.3s;
}
.stat:hover{border-color:var(--brand-l);transform:translateY(-3px);box-shadow:var(--shadow)}
.stat b{display:block;font-size:19px;font-weight:700;color:var(--brand-2);letter-spacing:.06em;margin-bottom:6px}
.stat span{font-size:12.5px;color:var(--ink-3);line-height:1.6;display:block}

.about-media{display:flex;justify-content:center}
.frame{position:relative;background:#fff;padding:12px 12px 36px;border:1px solid var(--line);box-shadow:var(--shadow);transition:.35s;width:100%}
.frame:hover{transform:translateY(-4px)}
.frame img{width:100%;aspect-ratio:4/3;object-fit:cover}
.frame::after{content:"";position:absolute;inset:7px;border:1px solid rgba(1,194,195,.22);pointer-events:none}
.frame figcaption{
  position:absolute;left:18px;right:18px;bottom:11px;font-size:12.5px;letter-spacing:.08em;color:var(--ink-3);
  display:flex;align-items:center;gap:8px;
}
.frame figcaption::before{content:"";width:14px;height:2px;background:var(--brand);flex-shrink:0}

/* ---------------- 公司产品 ---------------- */
.product-showcase{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(26px,4vw,52px);align-items:center}
.ps-list{display:grid;gap:10px;margin-top:20px}
.ps-list li{
  display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start;
  padding:14px 18px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  border-left:3px solid var(--brand);border-radius:2px;transition:.3s;
}
.ps-list li:hover{background:rgba(255,255,255,.12);transform:translateX(5px)}
.ps-no{font-size:20px;font-weight:700;color:var(--brand-l);line-height:1.6}
.ps-list h3{font-size:18px;margin-bottom:4px;letter-spacing:.05em;color:#fff}
.ps-list p{font-size:14.5px;color:rgba(216,238,239,.82)}

.ps-shots{display:flex;gap:14px;justify-content:center;align-items:flex-end}
.shot{
  position:relative;width:150px;border-radius:14px;overflow:hidden;
  border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.05);
  box-shadow:0 24px 50px -26px rgba(0,0,0,.7);transition:.4s;
}
.shot--main{width:196px}
.shot:not(.shot--main){margin-bottom:-26px}
.shot img{width:100%;display:block}
.shot:hover{transform:translateY(-8px)}
.shot figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:8px 6px;text-align:center;
  font-size:11.5px;color:#fff;letter-spacing:.04em;
  background:linear-gradient(0deg,rgba(15,52,54,.94),transparent);
}

/* ---------------- 公司业务 ---------------- */
.biz-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.biz-card{
  position:relative;background:rgba(255,255,255,.72);border:1px solid var(--line);
  padding:26px 22px 24px;border-radius:2px;transition:.35s;overflow:hidden;
}
.biz-card::before{
  content:"";position:absolute;inset:0 auto auto 0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--brand),var(--brand-l));transform:scaleX(0);transform-origin:left;transition:transform .4s;
}
.biz-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(1,194,195,.5)}
.biz-card:hover::before{transform:scaleX(1)}
.biz-no{font-size:15px;font-weight:700;color:var(--brand-l);letter-spacing:.1em}
.biz-card h3{font-size:19px;margin:8px 0 8px;letter-spacing:.05em}
.biz-card p{font-size:14px;color:var(--ink-2)}
.biz-card--link{background:linear-gradient(135deg,var(--brand),var(--brand-2));border-color:transparent}
.biz-card--link h3{color:#fff;margin-top:0}
.biz-card--link p{color:rgba(255,255,255,.88)}
.more{margin-top:12px;display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700;letter-spacing:.06em;transition:gap .25s}
.biz-card--link .more{color:#fff}
.more:hover{gap:12px}

/* ---------------- 公司优势 ---------------- */
.adv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:34px}
.adv{
  position:relative;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  padding:30px 28px;border-radius:2px;transition:.35s;overflow:hidden;
}
.adv::after{
  content:"";position:absolute;right:-40px;top:-40px;width:120px;height:120px;border-radius:50%;
  background:radial-gradient(circle,rgba(1,194,195,.26),transparent 70%);transition:.4s;
}
.adv:hover{transform:translateY(-6px);background:rgba(255,255,255,.12);border-color:rgba(1,194,195,.4)}
.adv:hover::after{transform:scale(1.35)}
.adv h3{font-size:20px;margin-bottom:12px;letter-spacing:.05em;color:#fff;position:relative;z-index:2}
.adv h3::after{content:"";display:block;width:32px;height:2px;background:var(--brand);margin-top:12px}
.adv p{font-size:15px;color:rgba(216,238,239,.82);position:relative;z-index:2}

/* ---------------- 公司风采 ---------------- */
.slide--gallery{justify-content:center;padding-top:var(--header-h);padding-bottom:calc(var(--header-h) + 12px)}
/* 去掉底部提示文字后，间距由 marquee 自身承担 */
.slide--gallery .marquee{margin-top:34px}
.filters{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.filter{
  font-size:14.5px;font-weight:700;letter-spacing:.08em;color:var(--ink-2);
  background:rgba(255,255,255,.75);border:1px solid var(--line);padding:9px 24px;border-radius:2px;cursor:pointer;transition:.25s;
}
.filter:hover{border-color:var(--brand-l);color:var(--brand-2)}
.filter.is-active{background:var(--brand);border-color:var(--brand);color:#fff}

.marquee{
  position:relative;z-index:3;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
}
.mq-track{display:flex;flex-direction:column;gap:14px}
.mq-row{display:flex;width:max-content;will-change:transform}
.mq-row.is-left{animation:scroll-left var(--dur,52s) linear infinite}
.mq-row.is-right{animation:scroll-right var(--dur,58s) linear infinite}
.marquee:hover .mq-row{animation-play-state:paused}
@keyframes scroll-left{from{transform:translateX(0)}to{transform:translateX(var(--shift,-50%))}}
@keyframes scroll-right{from{transform:translateX(var(--shift,-50%))}to{transform:translateX(0)}}

.mq-item{
  position:relative;width:var(--w,208px);flex-shrink:0;
  height:calc(var(--w,208px) * .75);   /* 固定高度：异宽条目仍等高，滚动条纹齐平 */
  overflow:hidden;border-radius:2px;cursor:zoom-in;background:var(--porcelain-3);
  border:1px solid rgba(255,255,255,.8);
  margin-right:14px;
}
.mq-item img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.3,1)}
.mq-item:hover img{transform:scale(1.08)}
.mq-item::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(15,52,54,.82),transparent 58%);opacity:0;transition:.35s}
.mq-item:hover::after{opacity:1}
.mq-item figcaption{
  position:absolute;left:14px;bottom:12px;z-index:2;color:#fff;font-size:13px;font-weight:700;letter-spacing:.06em;
  opacity:0;transform:translateY(10px);transition:.35s;
}
.mq-item:hover figcaption{opacity:1;transform:none}
.mq-item.is-tall{width:calc(var(--w,208px) * .78)}
.mq-item:focus-visible{outline:3px solid var(--brand-2);outline-offset:3px}

/* ---------------- 联系我们 ---------------- */
.contact-layout{display:grid;grid-template-columns:1.35fr .65fr;gap:22px;align-items:stretch;margin-top:32px}
.contact-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.cc{
  position:relative;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);
  padding:26px 24px;border-radius:2px;transition:.35s;overflow:hidden;
}
.cc:hover{transform:translateY(-5px);background:rgba(255,255,255,.13);border-color:rgba(1,194,195,.45)}
.cc-ico{
  position:absolute;right:20px;top:20px;width:40px;height:40px;
  display:grid;place-items:center;border-radius:50%;background:rgba(1,194,195,.18);
}
.cc-ico svg{width:20px;height:20px;fill:none;stroke:var(--brand-l);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.cc-label{font-size:12.5px;letter-spacing:.2em;color:rgba(200,230,231,.7);margin-bottom:8px;font-weight:700}
.cc-value{font-size:clamp(16px,1.8vw,20px);font-weight:700;color:var(--brand-l);letter-spacing:.02em;word-break:break-all}
.cc-value--text{font-size:15.5px;color:#fff;letter-spacing:.02em;line-height:1.8}
.cc-value:hover{text-decoration:underline;text-underline-offset:5px}

.qr-panel{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);
  border-radius:2px;padding:24px 20px;display:flex;flex-direction:column;justify-content:center;align-items:center;
}
.qr-title{font-size:14px;letter-spacing:.14em;color:#fff;margin-bottom:14px;font-weight:700;text-align:center}
.qr-list{display:flex;gap:12px;justify-content:center}
.qr-item{background:#fff;border-radius:2px;padding:9px 9px 6px;text-align:center;width:98px}
.qr-item img{width:100%;aspect-ratio:1/1;object-fit:contain}
.qr-item figcaption{font-size:11.5px;color:#7f9fa0;margin-top:3px;letter-spacing:.06em}

/* ---------------- 标题通用 ---------------- */
.section-title{font-size:clamp(26px,3.4vw,40px);letter-spacing:.08em;color:var(--ink)}
.section-title--center{text-align:center}
.section-sub{margin-top:14px;color:var(--ink-3);font-size:15.5px}
.section-sub--center{text-align:center;max-width:620px;margin-inline:auto}
.section-sub--left{margin-top:10px}
.rule{width:72px;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand-l));margin:18px 0 24px}

/* ---------------- 版权条 ---------------- */
.site-footer{background:var(--deep);color:#b9d4d5}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  padding:26px 0;
}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-logo{width:40px;height:40px;object-fit:contain;background:#fff;border-radius:6px;padding:3px}
.footer-brand strong{font-size:18px;font-weight:700;letter-spacing:.1em;color:#fff;display:block;line-height:1.3}
.footer-brand p{font-size:12.5px;color:#8fb4b5;line-height:1.5}
.footer-nav{display:flex;flex-wrap:wrap;gap:6px 20px}
.footer-nav a{font-size:13.5px;letter-spacing:.04em;color:#b9d4d5;transition:.25s}
.footer-nav a:hover{color:var(--brand-l)}
.footer-copy{font-size:12.5px;color:#77999a}

/* ---------------- 返回顶部 / 灯箱 ---------------- */
.back-top{
  position:fixed;left:26px;bottom:26px;width:46px;height:46px;display:grid;place-items:center;
  background:var(--brand);color:#fff;border-radius:2px;font-size:19px;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s;z-index:90;
}
.back-top.is-show{opacity:1;visibility:visible;transform:none}
.back-top:hover{background:var(--brand-2)}

.lightbox{
  position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;
  background:rgba(10,32,34,.96);padding:5vh 6vw;
}
.lightbox.is-open{display:flex}
.lightbox figure{max-width:min(1100px,88vw);max-height:88vh;display:flex;flex-direction:column;gap:12px}
.lightbox img{max-width:100%;max-height:80vh;object-fit:contain;margin-inline:auto;box-shadow:0 30px 80px -40px #000}
.lightbox figcaption{text-align:center;color:#dcefef;font-size:14.5px;font-weight:700;letter-spacing:.08em}
.lb-close,.lb-nav{
  position:absolute;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);
  color:#fff;width:48px;height:48px;border-radius:2px;font-size:26px;cursor:pointer;transition:.25s;
  display:grid;place-items:center;line-height:1;
}
.lb-close:hover,.lb-nav:hover{background:var(--brand);border-color:var(--brand)}
.lb-close{top:26px;right:26px;font-size:30px}
.lb-prev{left:3vw}
.lb-next{right:3vw}

/* ---------------- 响应式 ---------------- */
@media (max-width:1180px){
  .dots{right:16px}
  .contact-layout{grid-template-columns:1fr}
}
@media (max-width:1080px){
  .product-showcase{grid-template-columns:1fr}
  .biz-cards{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .nav{
    position:fixed;top:var(--header-h);right:0;left:auto;flex-direction:column;align-items:stretch;gap:0;
    width:min(300px,84vw);background:var(--porcelain);border-left:1px solid var(--line);
    box-shadow:-14px 20px 40px -30px rgba(15,52,54,.7);transform:translateX(105%);
    transition:transform .34s cubic-bezier(.2,.7,.3,1);height:calc(100vh - var(--header-h));
  }
  .nav.is-open{transform:none}
  .nav-link{padding:15px 24px;border-bottom:1px solid var(--line)}
  .nav-link::after{display:none}
  .nav-link.is-active{background:var(--brand-soft)}
  .nav-toggle{display:block}
  .nav-toggle.is-open span:nth-child(1){transform:translateY(5.6px) rotate(45deg)}
  .nav-toggle.is-open span:nth-child(2){opacity:0}
  .nav-toggle.is-open span:nth-child(3){transform:translateY(-5.6px) rotate(-45deg)}
  .about-grid{grid-template-columns:1fr;gap:26px}
  .about-media{max-width:520px}
  .adv-grid,.contact-cards{grid-template-columns:1fr}
  .adv-grid{margin-top:24px}
  .ps-shots{flex-wrap:wrap}
  .dots .dot-label{display:none}
  .slide{padding:calc(var(--header-h) + 20px) 0 44px}
}
@media (max-width:640px){
  :root{--header-h:68px}
  body{font-size:15px;line-height:1.75}
  /* 移动端内容常超出一屏，改为 proximity 以免强制吸附造成内容截断 */
  html{scroll-snap-type:y proximity}
  .slide{min-height:auto;padding:calc(var(--header-h) + 22px) 0 34px;scroll-snap-align:start}
  .slide--hero{min-height:100svh;justify-content:center}
  .brand-logo img{width:38px;height:38px}
  .brand-cn{font-size:19px}
  .hero-desc{font-size:15px}
  .btn{padding:12px 24px;font-size:14.5px}
  .about-stats{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:20px}
  .about-stats .stat{padding:12px 6px}
  .about-stats .stat b{font-size:16px}
  .about-stats .stat span{font-size:11px}
  .biz-cards{grid-template-columns:1fr;gap:10px}
  .biz-card{padding:18px 18px 16px}
  .biz-card p{font-size:13.5px}
  .ps-list{gap:7px;margin-top:14px}
  .ps-list li{padding:11px 14px;gap:12px}
  .ps-list p{font-size:13px}
  .adv-grid{gap:10px;margin-top:20px}
  .adv{padding:18px 18px}
  .adv h3{font-size:17px}
  .adv p{font-size:13.5px}
  .contact-layout{gap:12px;margin-top:20px}
  .contact-cards{gap:10px}
  .cc{padding:18px 16px}
  .cc-value{font-size:15px}
  .cc-value--text{font-size:14px}
  .mq-item{--w:190px}
  .mq-item figcaption{opacity:1;transform:none}
  .mq-track{gap:10px}
  .slide-cue{display:none}
  .dots{right:10px;gap:2px}
  .dots .dot-mark{width:7px;height:7px}
  .shot{width:120px}
  .shot--main{width:152px}
  .shot:not(.shot--main){margin-bottom:-16px}
  .qr-item{width:84px}
  .footer-inner{flex-direction:column;text-align:center;gap:14px}
  .back-top{left:14px;bottom:14px;width:42px;height:42px}
  .lb-prev{left:2vw}.lb-next{right:2vw}
  .lb-nav{width:40px;height:40px;font-size:22px}
  .lb-close{top:14px;right:14px;width:40px;height:40px;font-size:24px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-snap-type:none}
  *{animation:none!important;transition-duration:.01ms!important}
  [data-anim]{opacity:1;transform:none}
}