:root{
  --ink:#1d1d1f;
  --gray:#86868b;
  --line:#d2d2d7;
  --line-soft:#ececee;
  --bg:#f5f5f7;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,'PingFang SC','Segoe UI','Microsoft YaHei',Roboto,sans-serif;color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit;-webkit-tap-highlight-color:transparent}
img{display:block;max-width:100%}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px;position:relative}

/* ============ 导航（首屏透明覆于视频上，滚动后变白） ============ */
nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .4s ease,box-shadow .4s ease}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:70px;transition:height .4s ease}
.brand{display:flex;align-items:center;gap:12px}
.logo-chip{background:#fff;border-radius:10px;padding:4px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 10px rgba(0,0,0,.12)}
.logo-chip img{height:32px;width:auto;border-radius:6px}
.brand b{font-size:15px;font-weight:600;letter-spacing:.5px;color:#fff;transition:color .4s ease}
.nav-links{display:flex;gap:34px;list-style:none}
.nav-links a{font-size:13.5px;color:rgba(255,255,255,.85);transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-right{display:flex;align-items:center;gap:14px}
/* 搜索框：首屏半透明白，滚动后浅灰 */
.nav-search{display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:8px 16px;width:225px;transition:width .4s cubic-bezier(.22,.61,.36,1),background .3s,border-color .3s,box-shadow .3s}
.nav-search svg{width:15px;height:15px;stroke:rgba(255,255,255,.85);fill:none;stroke-width:1.8;flex-shrink:0;stroke-linecap:round;stroke-linejoin:round;transition:transform .35s cubic-bezier(.22,.61,.36,1)}
.nav-search:focus-within{background:rgba(255,255,255,.22);border-color:rgba(255,255,255,.6);box-shadow:0 0 0 3px rgba(255,255,255,.1)}
.nav-search:focus-within svg{transform:rotate(-12deg) scale(1.1)}
.nav-search input{background:transparent;border:none;outline:none;color:#fff;font-size:13.5px;width:100%;font-family:inherit;min-width:0}
.nav-search input::placeholder{color:rgba(255,255,255,.7)}
nav.scrolled .nav-search{background:#f5f5f7;border-color:transparent}
nav.scrolled .nav-search svg{stroke:var(--gray)}
nav.scrolled .nav-search input{color:var(--ink)}
nav.scrolled .nav-search input::placeholder{color:var(--gray)}
nav.scrolled .nav-search:focus-within{background:#fff;box-shadow:0 0 0 3px rgba(0,0,0,.06)}
.btn{display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:500;border-radius:999px;padding:11px 24px;transition:all .3s cubic-bezier(.22,.61,.36,1);white-space:nowrap;cursor:pointer;border:none;position:relative;overflow:hidden}
.btn:active{transform:scale(.95)}
.btn-nav{background:#fff;color:var(--ink)}
.btn-nav:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.2)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;transform:translateY(-2px);box-shadow:0 10px 28px rgba(0,0,0,.25)}
.btn-lg{padding:15px 34px;font-size:15px}

/* 滚动后导航变白 */
nav.scrolled{background:rgba(255,255,255,.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line-soft)}
nav.scrolled .nav-in{height:60px}
nav.scrolled .brand b{color:var(--ink)}
nav.scrolled .nav-links a{color:var(--gray)}
nav.scrolled .nav-links a:hover{color:var(--ink)}
nav.scrolled .btn-nav{background:var(--ink);color:#fff}

/* ============ 全屏视频 Hero ============ */
.hero{position:relative;height:100vh;height:100svh;min-height:600px;overflow:hidden;display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;background:#0b1226}
.hero-video{position:absolute;inset:0;opacity:0;transition:opacity 1.2s ease}
.hero-video.ready{opacity:1}
.hero-video video{width:100%;height:100%;object-fit:cover;pointer-events:none;will-change:transform}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,14,38,.55) 0%,rgba(8,14,38,.35) 45%,rgba(8,14,38,.72) 100%);pointer-events:none}
.hero-content{position:relative;z-index:2;color:#fff;padding-top:70px;will-change:transform,opacity}
.hero-content .kicker{font-size:13px;color:rgba(255,255,255,.75);letter-spacing:3px;margin-bottom:22px}
.hero-content h1{font-size:56px;font-weight:600;line-height:1.22;letter-spacing:-.5px;margin-bottom:24px;max-width:820px;text-shadow:0 2px 30px rgba(0,0,0,.25)}
.hero-content h1 .thin{font-weight:400;color:rgba(255,255,255,.85)}
.hero-content p{font-size:17px;color:rgba(255,255,255,.82);max-width:600px;margin-bottom:40px;line-height:1.9}
.hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.3)}
.btn-ghostw{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.btn-ghostw:hover{background:rgba(255,255,255,.12);border-color:#fff}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid rgba(255,255,255,.25);margin-top:64px;max-width:760px}
.hero-stats div{padding:24px 24px 4px 0}
.hero-stats .n{font-size:30px;font-weight:600;letter-spacing:-.5px}
.hero-stats .l{font-size:13px;color:rgba(255,255,255,.7);margin-top:6px}

/* 下滑提示 */
.scroll-hint{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);z-index:3;display:flex;flex-direction:column;align-items:center;gap:6px;color:rgba(255,255,255,.8);font-size:11px;letter-spacing:3px;cursor:pointer;transition:opacity .3s}
.scroll-hint:hover{opacity:1}
.scroll-hint svg{width:18px;height:18px;stroke:rgba(255,255,255,.9);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.scroll-hint svg:nth-child(1){animation:hint 2s ease-in-out infinite}
.scroll-hint svg:nth-child(2){animation:hint 2s ease-in-out infinite .3s}
@keyframes hint{0%,100%{transform:translateY(0);opacity:.3}50%{transform:translateY(6px);opacity:.9}}

/* ============ 滚动入场动画 ============ */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .9s cubic-bezier(.22,.61,.36,1),transform .9s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}

/* ============ 区块标题 ============ */
.sec-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:48px}
.sec-head h2{font-size:32px;font-weight:600;letter-spacing:-.5px}
.sec-head .sub{font-size:14px;color:var(--gray);margin-top:8px}
.sec-head .more{font-size:14px;color:var(--gray);white-space:nowrap;position:relative;transition:color .25s}
.sec-head .more::after{content:"";position:absolute;bottom:0;left:0;width:0;height:1px;background:var(--ink);transition:width .35s cubic-bezier(.22,.61,.36,1)}
.sec-head .more:hover{color:var(--ink)}
.sec-head .more:hover::after{width:100%}

/* ============ 分类 ============ */
.cats{padding:88px 0}
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.cat{padding:30px 26px 30px 0;border-bottom:1px solid var(--line);border-right:1px solid var(--line-soft);display:block;transition:transform .35s cubic-bezier(.22,.61,.36,1)}
.cat:nth-child(4n){border-right:none;padding-right:0}
.cat:hover{transform:translateX(6px)}
.cat h3{font-size:17px;font-weight:600;margin-bottom:8px;transition:color .25s}
.cat p{font-size:13px;color:var(--gray);line-height:1.7}

/* ============ 产品 ============ */
.products{background:var(--bg);padding:88px 0 96px}
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:36px 28px}
.p-card{display:flex;flex-direction:column}
.p-media{aspect-ratio:1;background:#fff;border-radius:var(--radius);overflow:hidden;display:block;transition:box-shadow .4s cubic-bezier(.22,.61,.36,1)}
.p-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.6,.2,1)}
.p-card:hover .p-media img{transform:scale(1.06)}
.p-card:hover .p-media{box-shadow:0 16px 40px -20px rgba(0,0,0,.28)}
.p-cat{font-size:12px;color:var(--gray);letter-spacing:2px;margin:20px 0 8px}
.p-name{font-size:16px;font-weight:600;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:52px}
/* 统一的「查看详情」——所有卡片完全一致 */
.p-btn{margin-top:16px;width:100%;padding:12px 0;border:1px solid var(--line);border-radius:999px;background:transparent;font-size:14px;font-weight:500;color:var(--ink);text-align:center;transition:all .3s cubic-bezier(.22,.61,.36,1);cursor:pointer}
.p-btn:hover{background:var(--ink);border-color:var(--ink);color:#fff;transform:translateY(-2px);box-shadow:0 8px 20px -8px rgba(0,0,0,.3)}
.p-btn:active{transform:scale(.96)}
/* 产品区搜索 */
.prod-search{display:none;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:13px 22px;margin-bottom:26px;transition:border-color .3s,box-shadow .3s}
.prod-search svg{width:17px;height:17px;stroke:var(--gray);fill:none;stroke-width:1.8;flex-shrink:0;stroke-linecap:round;stroke-linejoin:round;transition:transform .35s cubic-bezier(.22,.61,.36,1)}
.prod-search:focus-within{border-color:var(--ink);box-shadow:0 0 0 3px rgba(0,0,0,.05)}
.prod-search:focus-within svg{transform:rotate(-12deg) scale(1.1)}
/* 搜索结果工具栏 */
.prod-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:30px;min-height:22px;font-size:13.5px;color:var(--gray)}
.clear-filter{display:none;background:none;border:none;border-bottom:1px solid var(--ink);color:var(--ink);font-size:13.5px;font-family:inherit;cursor:pointer;padding:0 0 2px;white-space:nowrap}
.clear-filter:hover{opacity:.55}
.no-result{display:none;grid-column:1/-1;text-align:center;padding:90px 0;color:var(--gray)}
.no-result b{display:block;font-size:18px;font-weight:600;color:var(--ink);margin-bottom:10px}

/* ============ 关于 ============ */
.about{padding:96px 0}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:start}
.about .kicker-dark{font-size:12px;color:var(--gray);letter-spacing:3px;margin-bottom:18px}
.about h2{font-size:34px;font-weight:600;letter-spacing:-.5px;line-height:1.35;margin-bottom:22px}
.about p{font-size:15px;color:var(--gray);line-height:2;margin-bottom:16px}
.about .btn{margin-top:14px}
.app-tags{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 8px}
.app-tags span{font-size:12.5px;color:var(--ink);background:var(--bg);border:1px solid var(--line-soft);border-radius:999px;padding:6px 14px}
.about-list{list-style:none;border-top:1px solid var(--line);align-self:start}
.about-list li{padding:17px 0;border-bottom:1px solid var(--line-soft);font-size:15px;color:var(--ink);display:flex;justify-content:space-between;gap:16px}
.about-list li span{color:var(--gray);font-size:13.5px;text-align:right;flex-shrink:0}

/* ============ 三大保障（型号/品质/服务） ============ */
.promise{padding:24px 0 96px}
.promise-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.promise-item{border:1px solid var(--line-soft);border-radius:var(--radius);padding:34px 30px;background:#fff;transition:box-shadow .3s,transform .3s}
.promise-item:hover{box-shadow:0 16px 40px -24px rgba(0,0,0,.25);transform:translateY(-3px)}
.promise-tag{display:inline-block;font-size:12px;letter-spacing:2px;color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:5px 14px;margin-bottom:18px}
.promise-item.en .promise-tag{display:block}
.promise-en{font-size:11px;color:var(--gray);letter-spacing:1.5px;margin:-10px 0 16px}
.promise-item h4{font-size:18px;font-weight:600;margin-bottom:12px;letter-spacing:-.2px}
.promise-item p{font-size:14px;color:var(--gray);line-height:1.95}

/* ============ 团队精神 ============ */
.team{background:var(--bg);border-top:1px solid var(--line-soft);padding:96px 0}
.team-grid{display:grid;grid-template-columns:5fr 6fr;gap:64px;align-items:center}
.team-photo{border-radius:var(--radius);overflow:hidden;box-shadow:0 24px 60px -30px rgba(0,0,0,.35)}
.team-photo img{width:100%;display:block;aspect-ratio:4/3;object-fit:cover}
.team h2{font-size:32px;font-weight:600;letter-spacing:-.5px;line-height:1.35;margin-bottom:20px}
.team-slogan{font-size:16.5px;font-weight:600;color:var(--ink);letter-spacing:2px;padding:14px 20px;background:#fff;border-left:3px solid var(--ink);border-radius:0 6px 6px 0;margin-bottom:22px}
.team-text p{font-size:14.5px;color:var(--gray);line-height:2;margin-bottom:14px}
.team-points{list-style:none;margin-top:20px;display:grid;gap:12px}
.team-points li{font-size:14.5px;color:var(--ink);display:flex;gap:12px;align-items:flex-start;line-height:1.7}
.team-points li::before{content:"";width:6px;height:6px;background:var(--ink);border-radius:50%;margin-top:10px;flex-shrink:0}

/* ============ 企业使命 ============ */
.mission{padding:96px 0}
.mission-grid{display:grid;grid-template-columns:6fr 5fr;gap:64px;align-items:center}
.mission h2{font-size:32px;font-weight:600;letter-spacing:-.5px;line-height:1.35;margin-bottom:20px}
.mission-slogan{font-size:16px;font-weight:600;color:var(--ink);letter-spacing:1px;padding:16px 22px;background:var(--bg);border-left:3px solid var(--ink);border-radius:0 6px 6px 0;margin-bottom:22px;line-height:2}
.mission-text p{font-size:14.5px;color:var(--gray);line-height:2;margin-bottom:14px}
.mission-values{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 0}
.mission-values div{background:var(--bg);border:1px solid var(--line-soft);border-radius:8px;padding:16px 18px;font-size:15px;font-weight:600;color:var(--ink);text-align:center;transition:box-shadow .3s,transform .3s}
.mission-values div:hover{box-shadow:0 12px 30px -20px rgba(0,0,0,.3);transform:translateY(-2px)}
.mission-values div span{color:var(--gray);font-weight:400;font-size:12.5px;display:block;margin-top:5px;letter-spacing:1px}
.mission-photo{border-radius:var(--radius);overflow:hidden;box-shadow:0 24px 60px -30px rgba(0,0,0,.35)}
.mission-photo img{width:100%;display:block;object-fit:cover}
.mission-cap{font-size:12.5px;color:var(--gray);text-align:center;padding:12px 0 0;letter-spacing:1px}

/* ============ 服务 ============ */
.svc{border-top:1px solid var(--line-soft);padding:72px 0}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
.svc-item{padding:28px 24px 28px 0;border-right:1px solid var(--line-soft)}
.svc-item:last-child{border-right:none}
.svc-item h4{font-size:15px;font-weight:600;margin-bottom:6px}
.svc-item p{font-size:13px;color:var(--gray)}

/* ============ 五大保证 ============ */
.guarantee{padding:96px 0;background:var(--bg);border-top:1px solid var(--line-soft)}
.guarantee .sec-head{margin-bottom:14px}
.guarantee-intro{text-align:center;font-size:15px;color:var(--gray);line-height:1.9;max-width:680px;margin:0 auto 44px}
.guarantee-intro b{color:var(--ink);font-weight:600}
.g-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.g-item{background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);padding:28px 22px;display:flex;flex-direction:column;transition:box-shadow .3s,transform .3s}
.g-item:hover{box-shadow:0 18px 44px -26px rgba(0,0,0,.3);transform:translateY(-4px)}
.g-item.hl{border-color:var(--ink)}
.g-num{font-size:12px;color:var(--gray);letter-spacing:2px;margin-bottom:14px}
.g-item h4{font-size:18px;font-weight:600;margin-bottom:10px;letter-spacing:-.2px}
.g-tag{font-size:13px;color:var(--ink);font-weight:500;line-height:1.7;padding-bottom:14px;margin-bottom:14px;border-bottom:1px solid var(--line-soft)}
.g-item p{font-size:13px;color:var(--gray);line-height:1.85;flex-grow:1}
.g-tip{margin-top:36px;text-align:center;font-size:13.5px;color:var(--gray);line-height:1.9}
.g-tip span{display:inline-block;background:#fff;border:1px solid var(--line-soft);border-radius:999px;padding:12px 26px}

/* ============ 产品亮相 ============ */
.showcase{padding:96px 0;border-top:1px solid var(--line-soft)}
.showcase-grid{display:grid;grid-template-columns:7fr 5fr;gap:64px;align-items:center}
.showcase .kicker-dark{margin-bottom:18px}
.showcase h2{font-size:32px;font-weight:600;letter-spacing:-.5px;line-height:1.35;margin-bottom:22px}
.showcase-text p{font-size:14.5px;color:var(--gray);line-height:2;margin-bottom:16px}
.showcase-points{display:grid;gap:12px;margin:24px 0 28px}
.showcase-points div{display:flex;gap:12px;align-items:flex-start;font-size:14.5px;color:var(--ink);line-height:1.7}
.showcase-points div::before{content:"";width:6px;height:6px;background:var(--ink);border-radius:50%;margin-top:10px;flex-shrink:0}
.showcase-photo{max-width:440px;margin:0 auto;border-radius:var(--radius);overflow:hidden;box-shadow:0 28px 70px -34px rgba(0,0,0,.4);background:#fff}
.showcase-photo img{width:100%;display:block}
.showcase-photo .cap{font-size:12.5px;color:var(--gray);text-align:center;padding:12px 8px;letter-spacing:1px;border-top:1px solid var(--line-soft)}

/* ============ 了解品质 ============ */
.quality{padding:96px 0;background:var(--bg);border-top:1px solid var(--line-soft)}
.quality-head{text-align:center;max-width:720px;margin:0 auto 52px}
.quality-head .kicker-dark{margin-bottom:18px}
.quality-head h2{font-size:32px;font-weight:600;letter-spacing:-.5px;margin-bottom:14px}
.quality-lead{font-size:15.5px;color:var(--gray)}
.q-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.q-card{background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);overflow:hidden;transition:box-shadow .3s,transform .3s}
.q-card:hover{box-shadow:0 20px 50px -28px rgba(0,0,0,.3);transform:translateY(-4px)}
.q-card .q-img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block}
.q-body{padding:30px 30px 34px}
.q-tag{display:inline-block;font-size:12px;letter-spacing:2px;color:var(--gray);margin-bottom:12px}
.q-body h3{font-size:20px;font-weight:600;letter-spacing:-.3px;margin-bottom:14px}
.q-body p{font-size:14px;color:var(--gray);line-height:1.95;margin-bottom:12px}
.q-body p:last-child{margin-bottom:0}

/* ============ CTA ============ */
.cta-band{background:var(--bg);padding:96px 0;text-align:center}
.cta-band h2{font-size:38px;font-weight:600;letter-spacing:-.5px;margin-bottom:16px}
.cta-band p{font-size:16px;color:var(--gray);margin-bottom:36px}

/* ============ 页脚 ============ */
footer{border-top:1px solid var(--line-soft);padding:56px 0 32px}
.foot-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid var(--line-soft)}
.foot-brand .logo-chip{display:inline-flex;margin-bottom:14px}
.foot-brand p{font-size:13px;color:var(--gray);line-height:1.9;max-width:320px}
.foot-col h5{font-size:13px;font-weight:600;margin-bottom:14px;color:var(--ink)}
.foot-col a{display:block;font-size:13px;color:var(--gray);padding:5px 0;transition:color .2s}
.foot-col a:hover{color:var(--ink)}
.foot-bottom{padding-top:24px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--gray)}

/* ============ 移动端 ============ */
@media (max-width:900px){
  .wrap{padding:0 20px}
  .nav-links{display:none}
  .nav-search{display:none}
  .prod-search{display:flex}
  .hero-content h1{font-size:34px}
  .hero-content p{font-size:15px}
  .hero-stats{grid-template-columns:1fr 1fr;margin-top:44px;gap:0}
  .hero-stats div{padding:18px 12px 4px 0}
  .cats,.products,.about{padding:60px 0}
  .cat-grid{grid-template-columns:1fr 1fr}
  .cat{padding-right:18px}
  .cat:nth-child(4n){border-right:1px solid var(--line-soft)}
  .cat:nth-child(2n){border-right:none;padding-right:0}
  .prod-grid{grid-template-columns:1fr 1fr;gap:28px 16px}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .about{padding:60px 0}
  .promise{padding:0 0 60px}
  .promise-grid{grid-template-columns:1fr;gap:16px}
  .promise-item{padding:28px 24px}
  .team{padding:60px 0}
  .team-grid{grid-template-columns:1fr;gap:32px}
  .team-photo{max-width:520px}
  .team h2{font-size:26px}
  .mission{padding:60px 0}
  .mission-grid{grid-template-columns:1fr;gap:32px}
  .mission-photo{max-width:560px}
  .mission h2{font-size:26px}
  .mission-values{gap:10px}
  .mission-values div{padding:14px 12px;font-size:14px}
  .guarantee{padding:60px 0}
  .g-grid{grid-template-columns:1fr 1fr;gap:14px}
  .g-item{padding:24px 20px}
  .g-item.hl{grid-column:1/-1}
  .showcase{padding:60px 0}
  .showcase-grid{grid-template-columns:1fr;gap:36px}
  .showcase-photo{max-width:380px}
  .showcase h2{font-size:26px}
  .quality{padding:60px 0}
  .q-grid{grid-template-columns:1fr;gap:20px}
  .q-body{padding:24px 22px 28px}
  .q-body h3{font-size:18px}
  .about h2,.cta-band h2{font-size:27px}
  .sec-head h2{font-size:26px}
  .svc-grid{grid-template-columns:1fr 1fr}
  .svc-item{border-bottom:1px solid var(--line-soft)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-band{padding:64px 0}
  .scroll-hint{display:none}
}
@media (max-width:480px){
  .brand b{font-size:13px}
  .btn{padding:10px 18px;font-size:13px}
}

/* ============ 产品页（独立页） ============ */
nav.solid{background:rgba(255,255,255,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line-soft)}
nav.solid .nav-in{height:60px}
nav.solid .brand b{color:var(--ink)}
nav.solid .nav-links a{color:var(--gray)}
nav.solid .nav-links a:hover{color:var(--ink)}
nav.solid .btn-nav{background:var(--ink);color:#fff}
nav.solid .nav-search{background:#f5f5f7;border-color:transparent}
nav.solid .nav-search svg{stroke:var(--gray)}
nav.solid .nav-search input{color:var(--ink)}
nav.solid .nav-search input::placeholder{color:var(--gray)}
.page-head{padding:128px 0 34px;background:var(--bg);border-bottom:1px solid var(--line-soft)}
.page-head .kicker-dark{margin-bottom:14px}
.page-head h1{font-size:32px;font-weight:600;letter-spacing:-.5px;margin-bottom:10px}
.page-head p{font-size:14.5px;color:var(--gray);margin-bottom:26px}
.products-page{padding:44px 0 96px}
@media(max-width:760px){
  .page-head{padding:104px 0 28px}
  .page-head h1{font-size:25px}
}

/* ============ 通用：次按钮 / 按钮组（两页共用） ============ */
.btn-outline{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-outline:hover{border-color:var(--ink);background:#fff;transform:translateY(-1px)}
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.about-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px}

/* 分类卡片「查看该类产品」 */
.cat-go{display:inline-block;margin-top:12px;font-size:13px;color:var(--gray);opacity:0;transform:translateX(-8px);transition:opacity .3s,transform .35s cubic-bezier(.22,.61,.36,1),color .2s}
.cat:hover .cat-go{opacity:1;transform:translateX(0);color:var(--ink)}

/* 服务区四项可点击 */
a.svc-item{display:block;text-align:center;transition:transform .3s cubic-bezier(.22,.61,.36,1);cursor:pointer}
.svc-grid a.svc-item:hover{transform:translateY(-3px)}

/* 保证区底部按钮组 */
.g-tip{display:flex;flex-direction:column;align-items:center;gap:20px}

/* ============ 产品页：面包屑 / 返回 / 底部CTA / 回顶部 ============ */
.crumb-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.crumb{font-size:13.5px;color:var(--gray);display:flex;align-items:center;gap:6px}
.crumb a{color:var(--gray);position:relative;transition:color .25s}
.crumb a::after{content:"";position:absolute;bottom:-2px;left:0;width:0;height:1px;background:var(--ink);transition:width .3s cubic-bezier(.22,.61,.36,1)}
.crumb a:hover{color:var(--ink)}
.crumb a:hover::after{width:100%}
.crumb .sep{color:var(--line);font-size:12px}
.crumb .current{color:var(--ink);font-weight:500}
/* 返回按钮：胶囊药丸 + 箭头滑行动画 */
.back-link{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:var(--gray);background:#fff;border:1px solid var(--line-soft);border-radius:999px;padding:8px 18px 8px 14px;transition:all .35s cubic-bezier(.22,.61,.36,1)}
.back-link svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .35s cubic-bezier(.22,.61,.36,1)}
.back-link:hover{color:var(--ink);border-color:var(--ink);background:#fff;box-shadow:0 6px 18px -6px rgba(0,0,0,.15)}
.back-link:hover svg{transform:translateX(-4px)}
.back-link:active{transform:scale(.95)}
.prod-cta{padding:76px 0;background:var(--bg);border-top:1px solid var(--line-soft);text-align:center}
.prod-cta h3{font-size:26px;font-weight:600;letter-spacing:-.4px;margin-bottom:12px}
.prod-cta p{font-size:14.5px;color:var(--gray);margin-bottom:30px;max-width:560px;margin-left:auto;margin-right:auto;line-height:1.9}
/* 回顶部：悬浮玻璃球 + 箭头上跳 */
.to-top{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--line);box-shadow:0 8px 24px rgba(0,0,0,.1);display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity .35s,visibility .35s,transform .35s cubic-bezier(.22,.61,.36,1),box-shadow .35s;z-index:90}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(0,0,0,.16);border-color:var(--ink)}
.to-top:active{transform:scale(.9)}
.to-top svg{width:18px;height:18px;stroke:var(--ink);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .35s cubic-bezier(.22,.61,.36,1)}
.to-top:hover svg{transform:translateY(-2px)}
@media(max-width:760px){
  .to-top{right:16px;bottom:16px;width:42px;height:42px}
}