:root{
  --blue:#0054A7;
  --blue-deep:#003D7A;
  --accent:#8A94A6;
  --ink:#1A1A1A;
  --ink-soft:#5B6470;
  --line:rgba(26,26,26,0.10);
  --line-soft:rgba(26,26,26,0.06);
  --paper:#FFFFFF;
  --paper-2:#FAFBFC;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.8;-webkit-font-smoothing:antialiased;font-weight:400}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
.container{width:90%;max-width:1120px;margin:0 auto}
.eyebrow{display:inline-block;font-size:12px;letter-spacing:3px;color:var(--accent);font-weight:600;text-transform:uppercase}
.sec-head{max-width:720px;margin-bottom:48px}
.sec-head h2{font-size:clamp(28px,4vw,38px);font-weight:600;letter-spacing:-0.5px;margin-top:14px;line-height:1.25}
.sec-head p{color:var(--ink-soft);font-size:15px;margin-top:12px}

/* Nav */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{display:flex;align-items:center}
.logo-img{height:40px;width:auto;display:block}
.nav-links{display:flex;gap:30px;font-size:14px;color:var(--ink-soft)}
.nav-links a{transition:color .2s;font-weight:500}
.nav-links a:hover{color:var(--blue)}
.nav-links a.on{color:var(--blue);font-weight:600}
.nav-cta{border:1px solid var(--blue);color:var(--blue);padding:8px 18px;border-radius:999px;font-size:13px;font-weight:600;transition:all .2s}
.nav-cta:hover{background:var(--blue);color:#fff}

/* 子页头 */
.page-hero{background:linear-gradient(135deg,#003D7A,#0054A7);color:#fff;padding:60px 0 54px}
.page-hero .crumb{font-size:13px;color:rgba(255,255,255,.65)}
.page-hero .crumb a{color:rgba(255,255,255,.85)}
.page-hero h1{font-size:clamp(28px,4vw,40px);font-weight:600;letter-spacing:-0.5px;margin:12px 0 10px;line-height:1.25}
.page-hero p{color:rgba(255,255,255,.78);font-size:15px;max-width:760px}

/* Hero（首页） */
.hero{padding:96px 0 80px}
.hero-inner{display:grid;grid-template-columns:1.25fr 0.75fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(34px,4.8vw,50px);font-weight:600;letter-spacing:-1.2px;line-height:1.18;margin:18px 0 22px}
.hero h1 .blue{color:var(--blue)}
.hero .lede{font-size:16px;color:var(--ink-soft);max-width:520px}
.hero-btns{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn-solid{background:var(--blue);color:#fff;padding:13px 30px;border-radius:999px;font-size:15px;font-weight:600;transition:background .2s;display:inline-block}
.btn-solid:hover{background:var(--blue-deep)}
.btn-ghost{border:1px solid var(--line);color:var(--ink);padding:13px 30px;border-radius:999px;font-size:15px;font-weight:500;transition:all .2s;display:inline-block}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.brand-panel{background:var(--blue);border-radius:18px;padding:54px 48px;color:#fff;min-height:320px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;box-shadow:0 24px 60px rgba(0,84,167,0.18)}
.brand-panel .brand-logo{max-width:82%;height:auto;width:auto;display:block;margin:0 auto}
.brand-panel .bs{font-size:15px;color:#fff;letter-spacing:2px;margin-top:28px;font-weight:500;opacity:.92}
.brand-panel .bsub{font-size:12.5px;color:rgba(255,255,255,.62);letter-spacing:1px;margin-top:14px}
.hero-meta{display:flex;gap:64px;margin-top:64px;padding-top:30px;border-top:1px solid var(--line)}
.hero-meta b{display:block;font-size:34px;font-weight:700;color:var(--accent);letter-spacing:-0.5px}
.hero-meta span{font-size:13px;color:var(--ink-soft);margin-top:4px;display:block}

/* Video */
.video{padding:104px 0}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.v-card{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;transition:transform .35s ease,box-shadow .35s ease}
.v-card:hover{transform:translateY(-5px);box-shadow:0 20px 44px rgba(0,84,167,0.12)}
.v-el{width:100%;aspect-ratio:16/9;background:var(--blue);object-fit:cover;cursor:pointer}
.v-meta{padding:20px 22px}
.v-meta h4{font-size:17px;font-weight:600;margin-bottom:6px}
.v-meta p{font-size:13.5px;color:var(--ink-soft)}
.v-meta .src{margin-top:10px;font-size:12px;color:var(--accent);font-weight:600;letter-spacing:.5px}

/* About */
.about{padding:104px 0;background:var(--paper-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-text h3{font-size:22px;font-weight:600;color:var(--blue);margin-bottom:18px}
.about-text p{color:var(--ink-soft);margin-bottom:14px;font-size:15.5px}
.badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.badge{border:1px solid var(--line);border-radius:999px;padding:7px 15px;font-size:13px;color:var(--ink)}
.about-visual{border-radius:14px;min-height:320px;overflow:hidden;background:var(--blue)}
.about-visual img{width:100%;height:320px;object-fit:cover;display:block}

/* Products */
.products{padding:104px 0}
.p-tabs{display:flex;gap:10px;margin-bottom:28px}
.p-tab{border:1px solid var(--line);border-radius:999px;padding:10px 24px;font-size:14px;font-weight:600;color:var(--ink-soft);background:#fff;cursor:pointer;transition:all .2s}
.p-tab:hover{border-color:var(--blue);color:var(--blue)}
.p-tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.p-panel{display:none}
.p-panel.active{display:block;animation:fadeIn .35s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.p-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.p-card{border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:border-color .3s,transform .3s;background:#fff}
.p-card:hover{border-color:var(--blue);transform:translateY(-4px)}
.p-img{height:200px;background:var(--paper-2);overflow:hidden;border-bottom:1px solid var(--line-soft);position:relative}
.p-img img{width:100%;height:200px;object-fit:cover;object-position:center 60%;display:block}
.p-img img.sq{object-fit:contain;object-position:center;background:linear-gradient(135deg,#f5f7fa 0%,#eef1f5 100%);padding:10px}
.p-img .ph{width:100%;height:200px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f5f7fa 0%,#eef1f5 100%);color:var(--blue);font-size:15px;font-weight:700;letter-spacing:1px}
.p-body{padding:22px}
.p-body .t{font-size:12px;color:var(--accent);font-weight:600;letter-spacing:1px;margin-bottom:8px}
.p-body h4{font-size:17px;font-weight:600;margin-bottom:8px}
.p-body p{font-size:14px;color:var(--ink-soft)}
.p-table{width:100%;border-collapse:collapse;margin-top:44px;font-size:14px}
.p-table th,.p-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line-soft)}
.p-table th{font-weight:600;color:var(--ink-soft);font-size:13px;letter-spacing:.5px}
.p-table td:first-child{font-weight:600;color:var(--blue)}
.p-table .cat-row td{background:var(--paper-2);font-weight:700;color:var(--ink);font-size:13px;letter-spacing:.5px}

/* Cases & Install */
.cases,.install{padding:104px 0;background:var(--paper-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.cases .sec-head,.install .sec-head{margin-bottom:36px}
.placeholder-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.placeholder-card{border:2px dashed var(--line);border-radius:14px;padding:40px 24px;text-align:center;background:#fff;transition:border-color .3s,transform .3s}
.placeholder-card:hover{border-color:var(--blue);transform:translateY(-4px)}
.placeholder-card .icon{width:54px;height:54px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 18px;font-size:22px}
.placeholder-card h4{font-size:17px;font-weight:600;margin-bottom:8px}
.placeholder-card p{font-size:13.5px;color:var(--ink-soft)}
.placeholder-card .tag{display:inline-block;margin-top:14px;font-size:12px;color:var(--accent);font-weight:600;letter-spacing:.5px}

/* Standards 资质 */
.standards{padding:104px 0}
.std-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.std-card{border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:12px;padding:28px;background:#fff}
.std-card h4{font-size:18px;font-weight:600;margin-bottom:10px}
.std-card p{font-size:14px;color:var(--ink-soft)}

/* Solutions */
.solutions{padding:104px 0;background:var(--paper-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.s-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.s-card{border-top:2px solid var(--blue);background:#fff;border-radius:0 0 12px 12px;padding:32px 28px}
.s-card.gold{border-top-color:var(--accent)}
.s-card.dark{border-top-color:var(--ink)}
.s-card h4{font-size:19px;font-weight:600;margin-bottom:16px}
.s-card ul{list-style:none}
.s-card li{position:relative;padding:7px 0 7px 18px;color:var(--ink-soft);font-size:14px;border-bottom:1px solid var(--line-soft)}
.s-card li:last-child{border-bottom:none}
.s-card li::before{content:"";position:absolute;left:0;top:16px;width:6px;height:6px;border-radius:50%;background:var(--accent)}

/* 合作流程 */
.process{padding:104px 0;background:var(--paper-2);border-top:1px solid var(--line)}
.flow-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:28px;align-items:start}
.col-title{font-size:14px;font-weight:600;color:var(--blue);letter-spacing:1px;margin-bottom:16px}
.col-title.green{color:#0F6E56}
.steps{display:flex;flex-direction:column;gap:10px}
.step{display:flex;align-items:flex-start;gap:14px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px 16px}
.step .n{flex:0 0 30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font-size:14px;font-weight:600;display:flex;align-items:center;justify-content:center;margin-top:3px}
.step h4{font-size:15px;font-weight:600;line-height:1.5}
.step p{font-size:13px;color:var(--ink-soft);line-height:1.7}
.pledges{display:flex;flex-direction:column;gap:10px}
.pledge{background:var(--paper);border:1px solid var(--line);border-left:3px solid #0F6E56;border-radius:10px;padding:13px 16px}
.pledge h4{font-size:14.5px;font-weight:600;line-height:1.5}
.pledge h4 .tag{display:inline-block;font-size:11px;color:#0F6E56;border:1px solid rgba(15,110,86,.35);border-radius:99px;padding:0 8px;margin-left:8px;vertical-align:1px;font-weight:400}
.pledge p{font-size:13px;color:var(--ink-soft);line-height:1.7}
.flow-note{margin-top:26px;font-size:13px;color:var(--ink-soft);border-top:1px dashed var(--line);padding-top:14px}
.flow-note b{color:var(--ink);font-weight:600}

/* FAQ */
.faq{padding:104px 0}
.faq-list{max-width:860px}
details{border-bottom:1px solid var(--line);padding:22px 0}
summary{font-size:16px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--blue);font-size:22px;font-weight:400;transition:transform .3s}
details[open] summary::after{content:"\2212";transform:rotate(180deg)}
details p{color:var(--ink-soft);font-size:14.5px;margin-top:14px;max-width:720px}

/* Contact */
.contact{padding:104px 0}
.c-box{background:var(--blue);border-radius:18px;padding:60px;display:grid;grid-template-columns:1.2fr .9fr .6fr;gap:40px;color:#fff}
.c-box h3{font-size:28px;font-weight:600;margin-bottom:14px;letter-spacing:-0.5px}
.c-box p{color:rgba(255,255,255,.82);font-size:15px;margin-bottom:10px}
.c-box .btn-solid{display:inline-block;margin-top:24px;background:var(--accent);color:var(--ink)}
.c-box .btn-solid:hover{background:#b58a4e}
.c-info{border-left:1px solid rgba(255,255,255,.2);padding-left:32px}
.c-qr{border-left:1px solid rgba(255,255,255,.2);padding-left:32px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px}
.qr-box{background:#fff;border-radius:12px;padding:10px;box-shadow:0 8px 24px rgba(0,0,0,.25);width:170px}
.qr-box img{width:100%;height:auto;display:block;aspect-ratio:1/1;object-fit:cover}
.c-info dt{font-size:12px;color:var(--accent);letter-spacing:1px;margin:18px 0 4px}
.c-info dt:first-child{margin-top:0}
.c-info dd{font-size:15px}
.c-note{margin-top:16px;font-size:12.5px;color:rgba(255,255,255,.6)}

/* Manuals */
.manuals{padding:104px 0;background:var(--paper-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.m-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.m-card{border:1px solid var(--line);border-radius:12px;padding:22px;background:#fff;display:flex;flex-direction:column;transition:border-color .3s,transform .3s}
.m-card:hover{border-color:var(--blue);transform:translateY(-4px)}
.m-card .m-cover{display:flex;gap:14px;align-items:flex-start;margin-bottom:12px}
.m-card .m-cover img{width:76px;height:auto;display:block;border-radius:6px;box-shadow:0 4px 14px rgba(0,0,0,.14);flex-shrink:0;aspect-ratio:2/3;object-fit:cover;object-position:top}
.m-card .m-cover .mtxt{flex:1;min-width:0}
.m-card .mt{font-size:12px;color:var(--accent);font-weight:600;letter-spacing:1px;margin-bottom:6px}
.m-card h4{font-size:17px;font-weight:600;margin-bottom:8px;line-height:1.3}
.m-card p{font-size:13px;color:var(--ink-soft);flex:1;margin-bottom:16px}
.m-card .dl{display:block;text-align:center;background:var(--blue);color:#fff;padding:10px 0;border-radius:999px;font-size:13px;font-weight:600;transition:background .2s}
.m-card .dl:hover{background:var(--blue-deep)}
.m-card .dl.wait{background:var(--accent);cursor:default}

/* Footer */
footer{background:var(--ink);color:rgba(255,255,255,.55);padding:38px 0;font-size:13px}
footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px}
footer .footer-logo{height:22px;width:auto;display:block;vertical-align:middle;margin-right:10px;vertical-align:-4px}
footer strong{color:#fff;font-weight:600}
footer .f-links{width:100%;border-top:1px solid rgba(255,255,255,.12);padding-top:16px;margin-top:4px;font-size:12.5px}
footer .f-links a{color:rgba(255,255,255,.55);margin-right:18px}
footer .f-links a:hover{color:#fff}

/* Reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:860px){
  .hero-inner,.about-grid,.video-grid,.s-grid,.c-box,.std-grid{grid-template-columns:1fr}
  .brand-panel{min-height:auto}
  .nav-links{display:none}
  .hero-meta{gap:32px;flex-wrap:wrap}
  .c-info{border-left:none;padding-left:0;border-top:1px solid rgba(255,255,255,.2);padding-top:24px}
  .c-box{padding:40px 28px}
  .c-qr{border-left:none;padding-left:0;border-top:1px solid rgba(255,255,255,.2);padding-top:24px}
  .nav-burger{display:flex}
  .nav-cta{display:none}
  .flow-grid{grid-template-columns:1fr}
}

/* 移动端汉堡菜单 */
.nav-burger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;transition:border-color .2s}
.nav-burger:active{border-color:var(--blue)}
.nav-burger span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.m-menu{display:none;position:fixed;top:76px;left:0;right:0;bottom:0;background:rgba(255,255,255,.98);backdrop-filter:blur(10px);z-index:99;padding:24px 6% 40px;overflow-y:auto}
.m-menu.open{display:block;animation:mIn .28s ease}
@keyframes mIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.m-menu a{display:flex;align-items:center;justify-content:space-between;padding:17px 4px;font-size:16.5px;font-weight:500;color:var(--ink);border-bottom:1px solid var(--line-soft)}
.m-menu a .arr{color:var(--accent);font-size:14px}
.m-menu .m-cta{display:block;margin-top:28px;background:var(--blue);color:#fff;text-align:center;padding:14px 0;border-radius:999px;font-size:15px;font-weight:600}
.m-menu .m-tel{display:block;margin-top:12px;text-align:center;font-size:14px;color:var(--ink-soft)}
.m-menu .m-tel b{color:var(--blue);font-weight:600}