/* 上海智岳 官网 v2 — 品牌色取自公司 Logo（红 / 蓝）
   字体只用系统字体：Google Fonts 在中国大陆无法稳定加载 */
:root{
  --navy:#0a1220;--navy2:#101b2e;--line:rgba(255,255,255,.09);
  --red:#d8342a;--red-hi:#f0553f;--blue:#2a48d0;--blue-hi:#7d93ff;--glow:#ffb15a;
  --text:#e8edf4;--muted:#9aa7b8;
  --paper:#f6f4f0;--paper2:#ece8e1;--ink:#141c2b;--ink2:#4a5566;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --maxw:1240px;--r:6px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html[lang="en"] .zh,html[lang="zh-CN"] .en{display:none!important}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.ph{color:var(--red-hi);font-weight:600}
:focus-visible{outline:2px solid var(--blue-hi);outline-offset:3px}

.section{padding:110px 0;position:relative}
.section.dark{background:var(--navy);color:var(--text)}
.section.dark2{background:linear-gradient(180deg,var(--navy2),var(--navy));color:var(--text)}
.section.soft{background:var(--paper2)}
.eyebrow{display:inline-flex;align-items:center;gap:12px;font-size:13px;letter-spacing:.2em;text-transform:uppercase;color:var(--red);font-weight:700;margin-bottom:16px}
.eyebrow::before{content:"";width:28px;height:2px;background:linear-gradient(90deg,var(--red) 50%,var(--blue) 50%)}
.dark .eyebrow,.dark2 .eyebrow,.founder .eyebrow{color:var(--red-hi)}
h2.title{font-size:clamp(28px,3.4vw,44px);line-height:1.28;font-weight:800;letter-spacing:-.01em;margin-bottom:18px}
.lead{font-size:17px;color:var(--ink2);max-width:760px}
.dark .lead,.dark2 .lead,.founder .lead{color:var(--muted)}
.sec-head{margin-bottom:56px}
.sec-head.center{text-align:center}.sec-head.center .lead{margin:0 auto}

/* header */
header{position:fixed;inset:0 0 auto 0;z-index:100;transition:background .35s,box-shadow .35s}
header.scrolled{background:rgba(10,18,32,.94);backdrop-filter:blur(12px);box-shadow:0 6px 30px rgba(0,0,0,.3)}
.nav{display:flex;align-items:center;justify-content:space-between;height:80px;transition:height .35s}
header.scrolled .nav{height:66px}
.logo{display:flex;align-items:center;gap:12px;color:#fff}
.logo-mark{width:42px;height:42px;flex:0 0 42px}
.logo-text{line-height:1.2}
.logo-text b{display:block;font-size:18px;letter-spacing:.06em}
.logo-text small{font-size:11px;letter-spacing:.18em;color:var(--muted)}
.menu{display:flex;gap:28px;list-style:none}
.menu a{color:#d7dfe9;font-size:15px;font-weight:500;position:relative;padding:6px 0}
.menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--red-hi);transition:width .3s}
.menu a:hover{color:#fff}.menu a:hover::after{width:100%}
.nav-right{display:flex;align-items:center;gap:14px}
.lang-btn{display:flex;border:1px solid rgba(255,255,255,.25);border-radius:999px;overflow:hidden;cursor:pointer;background:rgba(255,255,255,.04);font:inherit}
.lang-btn span{padding:6px 13px;font-size:13px;font-weight:700;color:#c9d3df;transition:.25s}
html[lang="zh-CN"] .lang-btn .l-zh,html[lang="en"] .lang-btn .l-en{background:var(--red);color:#fff}
.burger{display:none;background:none;border:0;cursor:pointer;width:36px;height:36px;position:relative}
.burger i{position:absolute;left:6px;right:6px;height:2px;background:#fff;transition:.3s}
.burger i:nth-child(1){top:11px}.burger i:nth-child(2){top:17px}.burger i:nth-child(3){top:23px}
.burger[aria-expanded="true"] i:nth-child(1){top:17px;transform:rotate(45deg)}
.burger[aria-expanded="true"] i:nth-child(2){opacity:0}
.burger[aria-expanded="true"] i:nth-child(3){top:17px;transform:rotate(-45deg)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 28px;border-radius:4px;font-weight:700;font-size:15px;letter-spacing:.03em;transition:.3s;border:2px solid transparent;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 10px 30px rgba(216,52,42,.3)}
.btn-primary:hover{background:var(--red-hi);transform:translateY(-2px)}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{border-color:var(--blue-hi);color:var(--blue-hi)}

/* hero */
.hero{min-height:100vh;padding:120px 0 60px;display:flex;flex-direction:column;justify-content:center;position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(ellipse 50% 60% at 80% 50%,rgba(240,110,40,.22),transparent 70%),
             radial-gradient(ellipse 40% 50% at 10% 100%,rgba(42,72,208,.22),transparent 70%),
             linear-gradient(160deg,#060c16 0%,#0a1220 50%,#111c2e 100%)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(180deg,rgba(0,0,0,.6),transparent 85%);-webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.6),transparent 85%)}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.25fr .75fr;gap:60px;align-items:center;width:100%}
.hero h1{font-size:clamp(36px,4.8vw,64px);line-height:1.16;font-weight:900;letter-spacing:-.02em;margin-bottom:24px}
.hero h1 em{font-style:normal;color:var(--glow)}
.hero p{font-size:18px;color:#b9c5d4;max-width:620px;margin-bottom:36px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-badge{display:inline-flex;align-items:center;gap:10px;padding:8px 16px;border:1px solid rgba(125,147,255,.35);border-radius:999px;font-size:13px;color:#c8d2ff;margin-bottom:26px;background:rgba(42,72,208,.12);line-height:1.5}
.hero-badge .dot{flex:0 0 8px;width:8px;height:8px;border-radius:50%;background:var(--red-hi);box-shadow:0 0 0 0 rgba(240,85,63,.7);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 10px rgba(240,85,63,0)}100%{box-shadow:0 0 0 0 rgba(240,85,63,0)}}
.hero-photo{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:3/4;max-height:72vh;box-shadow:0 40px 90px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.08);justify-self:end;width:100%;max-width:440px}
.hero-photo img{width:100%;height:100%;object-fit:cover;object-position:50% 50%}
.hero-photo figcaption{position:absolute;left:0;right:0;bottom:0;padding:40px 18px 14px;font-size:13px;color:#e6ebf2;background:linear-gradient(0deg,rgba(0,0,0,.7),transparent)}
.stats{position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);margin-top:64px;border-top:1px solid rgba(255,255,255,.12)}
.stat{padding:24px 20px 0 0;display:flex;flex-direction:column-reverse}
.stat dd{font-size:40px;font-weight:800;color:#fff;line-height:1.1}
.stat dd small{font-size:18px;font-weight:700;margin-left:2px;color:var(--glow)}
.stat dt{font-size:14px;color:var(--muted);margin-top:6px}

/* about */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:72px;align-items:center}
.checks{list-style:none;margin-top:28px;display:grid;grid-template-columns:1fr 1fr;gap:14px 24px}
.checks li{display:flex;gap:10px;align-items:flex-start;font-weight:500}
.checks li::before{content:"";flex:0 0 18px;height:18px;margin-top:5px;border-radius:50%;background:var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3.5' d='M5 12l5 5 9-10'/%3E%3C/svg%3E") center/11px no-repeat}
.fact-card{background:#fff;border-radius:var(--r);box-shadow:0 30px 70px rgba(20,28,43,.12);overflow:hidden;border-top:4px solid var(--red)}
.fact-head{display:flex;gap:16px;align-items:center;padding:26px 28px;border-bottom:1px solid var(--paper2)}
.fact-head svg{width:52px;height:52px;flex:0 0 52px}
.fact-head b{display:block;font-size:18px}
.fact-head small{font-size:13px;color:var(--ink2);line-height:1.5;display:block}
.fact-card dl{padding:8px 28px 20px}
.fact-card dl div{display:grid;grid-template-columns:96px 1fr;gap:12px;padding:13px 0;border-bottom:1px dashed var(--paper2);font-size:15px}
.fact-card dl div:last-child{border-bottom:0}
.fact-card dt{color:var(--ink2);font-size:14px}
.fact-card dd{font-weight:600}
html[lang="en"] .fact-card dl div{grid-template-columns:130px 1fr}

/* pillars */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pillar{position:relative;padding:44px 36px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(160deg,rgba(255,255,255,.04),rgba(255,255,255,.01));overflow:hidden;transition:.4s}
.pillar::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--red) 50%,var(--blue) 50%);transform:scaleX(0);transform-origin:left;transition:.5s}
.pillar:hover{transform:translateY(-6px);border-color:rgba(125,147,255,.35)}
.pillar:hover::before{transform:scaleX(1)}
.pillar .num{position:absolute;right:24px;top:12px;font-size:96px;font-weight:900;color:rgba(255,255,255,.04);line-height:1}
.pillar .icon{width:60px;height:60px;border-radius:10px;display:grid;place-items:center;color:var(--red-hi);background:rgba(216,52,42,.12);border:1px solid rgba(216,52,42,.35);margin-bottom:24px}
.pillar h3{font-size:23px;margin-bottom:12px;color:#fff}
.pillar p{color:var(--muted);margin-bottom:22px;font-size:15px}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tags>span{font-size:12.5px;padding:5px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.14);color:#cfd8e3}

/* fiber lining */
.lining-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.lining-diagram{background:#fff;border-radius:var(--r);padding:28px 28px 22px;box-shadow:0 20px 50px rgba(20,28,43,.08)}
.lining-diagram svg{width:100%;height:auto;display:block}
.lining-diagram figcaption{font-size:12.5px;color:var(--ink2);margin-top:10px}
.layer-key{list-style:none;display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:14px;font-size:14px;font-weight:600}
.layer-key li{display:flex;align-items:center;gap:8px}
.layer-key i{width:14px;height:14px;border-radius:3px;display:inline-block;border:1px solid rgba(0,0,0,.15)}
.layer-key .k1{background:#f3ede3}.layer-key .k2{background:#e6ebfa}.layer-key .k3{background:#8a96a8}
.lining-spec{display:grid;gap:16px}
.spec{padding:20px 24px;background:#fff;border-radius:var(--r);border-left:3px solid var(--blue)}
.spec b{display:block;font-size:17px;margin-bottom:4px}
.spec p{font-size:15px;color:var(--ink2)}
.spec.hl{border-left-color:var(--red);background:#fff6f3}
.care{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:40px}
.care>div{padding:26px 28px;border:1px solid #ddd6cb;border-radius:var(--r)}
.care h4{font-size:17px;margin-bottom:8px}
.care p{font-size:15px;color:var(--ink2)}

/* technology */
.tech{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.tech-item{padding:30px 26px;border:1px solid var(--line);border-radius:var(--r);background:rgba(255,255,255,.03)}
.t-temp{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.04em;color:var(--glow);padding:3px 10px;border:1px solid rgba(255,177,90,.35);border-radius:999px;margin-bottom:16px}
.tech-item h4{font-size:18px;color:#fff;margin-bottom:8px;line-height:1.45}
.tech-item p{font-size:14.5px;color:var(--muted)}
.benefits{display:grid;grid-template-columns:repeat(4,1fr);margin-top:40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.benefits div{padding:22px 10px;text-align:center;font-size:17px}
.benefits div+div{border-left:1px solid var(--line)}
.benefits b::before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px;background:var(--red-hi);margin-right:10px;vertical-align:middle}

/* founder */
.founder{background:linear-gradient(120deg,#0a1220 0%,#12204a 70%,#1a2a6a 130%);color:var(--text);overflow:hidden}
.founder::after{content:"";position:absolute;right:-220px;top:-220px;width:620px;height:620px;border-radius:50%;background:radial-gradient(circle,rgba(216,52,42,.18),transparent 65%)}
.founder-grid{display:grid;grid-template-columns:.75fr 1.25fr;gap:72px;align-items:center;position:relative;z-index:1}
.portrait{aspect-ratio:3/3.6;border-radius:var(--r);background:linear-gradient(160deg,#1c2b52,#0d1730);border:1px solid var(--line);position:relative;display:grid;place-items:center;overflow:hidden}
.mono{font-size:150px;font-weight:900;color:rgba(255,255,255,.08);line-height:1}
.portrait .ph-label{position:absolute;bottom:0;left:0;right:0;padding:22px 24px;background:linear-gradient(0deg,rgba(0,0,0,.55),transparent);font-size:14px;color:#cfd8e3}
.portrait .ph-label b{display:block;font-size:22px;color:#fff}
.cred{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:30px}
.cred div{padding:20px 22px;border:1px solid var(--line);border-radius:var(--r);background:rgba(255,255,255,.04)}
.cred b{display:block;color:#fff;font-size:15px;margin-bottom:4px}
.cred b::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--red-hi);margin-right:8px;vertical-align:middle}
.cred span{font-size:14px;color:var(--muted)}

/* clients */
.wordmarks{list-style:none;display:grid;grid-template-columns:repeat(6,1fr);border:1px solid #ddd6cb;border-radius:var(--r);overflow:hidden;background:#fff}
.wordmarks li{display:grid;place-items:center;text-align:center;min-height:96px;padding:14px;font-size:18px;font-weight:800;color:var(--ink);letter-spacing:.04em;line-height:1.35}
.wordmarks li+li{border-left:1px solid #ece6dc}
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:28px}
.case{padding:30px 28px;background:#fff;border-radius:var(--r);border-bottom:3px solid transparent;transition:.35s}
.case:hover{border-bottom-color:var(--red);transform:translateY(-4px);box-shadow:0 20px 40px rgba(20,28,43,.08)}
.case small{font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--blue);text-transform:uppercase}
.case h4{font-size:18px;margin:6px 0 8px;line-height:1.45}
.case p{font-size:15px;color:var(--ink2)}

/* certs */
.certs{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.cert{background:#fff;border-radius:var(--r);overflow:hidden;box-shadow:0 14px 40px rgba(20,28,43,.08)}
.cert a{display:block;aspect-ratio:4/3;background:#f2efe9;overflow:hidden}
.cert img{width:100%;height:100%;object-fit:contain;transition:.5s}
.cert a:hover img{transform:scale(1.03)}
.cert figcaption{padding:18px 22px}
.cert figcaption b{display:block;font-size:16px}
.cert figcaption>span{font-size:14px;color:var(--ink2)}

/* process */
.process{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);position:relative}
.process::before{content:"";position:absolute;top:22px;left:10%;right:10%;height:2px;background:linear-gradient(90deg,var(--red),var(--blue))}
.step{text-align:center;position:relative;padding:0 10px}
.step i{display:grid;place-items:center;width:46px;height:46px;margin:0 auto 14px;border-radius:50%;background:var(--navy);color:#fff;font-style:normal;font-weight:800;border:2px solid var(--red);position:relative}
.step b{display:block;font-size:16px}
.step>span{font-size:13px;color:var(--ink2)}

/* contact */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px}
.contact-grid .lead{margin-bottom:22px}
.info-item{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line)}
.info-item .ic{flex:0 0 46px;height:46px;border-radius:8px;display:grid;place-items:center;color:var(--red-hi);background:rgba(216,52,42,.12);border:1px solid rgba(216,52,42,.3)}
.info-item small{display:block;color:var(--muted);font-size:13px}
.info-item b{font-size:16px;color:#fff;font-weight:600}
.info-item b.ph{color:var(--red-hi)}
form{background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:var(--r);padding:40px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{margin-bottom:18px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px}
.field input,.field select,.field textarea{width:100%;padding:13px 15px;background:rgba(10,18,32,.6);border:1px solid rgba(255,255,255,.14);border-radius:4px;color:#fff;font:inherit;font-size:15px;transition:.25s}
.field select option{background:var(--navy)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue-hi);box-shadow:0 0 0 3px rgba(125,147,255,.18)}
.field input[aria-invalid="true"]{border-color:var(--red-hi)}
.field textarea{min-height:120px;resize:vertical}
.form-msg{margin-top:14px;color:#c8d2ff;font-size:14px;min-height:20px}

footer{background:#060c16;color:var(--muted);padding:64px 0 28px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px;border-bottom:1px solid var(--line)}
.foot-logo{margin-bottom:16px}
.foot-about{max-width:340px}
footer h5{color:#fff;font-size:15px;margin-bottom:16px}
footer ul{list-style:none}footer li{margin-bottom:10px}
footer a:hover{color:#fff}
.foot-bottom{display:flex;justify-content:space-between;padding-top:24px;flex-wrap:wrap;gap:10px}

/* reveal（无 JS 时内容直接可见） */
.js .reveal{opacity:0;transform:translateY(32px);transition:opacity .8s ease,transform .8s ease}
.js .reveal.in{opacity:1;transform:none}
.d1{transition-delay:.1s!important}.d2{transition-delay:.2s!important}.d3{transition-delay:.3s!important}

/* responsive */
@media(max-width:1180px){
  .menu{gap:18px}.menu a{font-size:14px}
  .tech{grid-template-columns:1fr 1fr}
  .wordmarks{grid-template-columns:repeat(3,1fr)}
  .wordmarks li:nth-child(4){border-left:0}
  .wordmarks li:nth-child(n+4){border-top:1px solid #ece6dc}
}
@media(max-width:960px){
  .burger{display:block}
  .menu{position:fixed;top:66px;left:0;right:0;flex-direction:column;gap:0;background:rgba(10,18,32,.98);padding:8px 28px 22px;transform:translateY(-8px);opacity:0;visibility:hidden;transition:.3s}
  .menu.open{transform:none;opacity:1;visibility:visible}
  .menu a{display:block;padding:14px 0;border-bottom:1px solid var(--line)}
  header{background:rgba(10,18,32,.94)}
  .nav,header.scrolled .nav{height:66px}
  .hero{min-height:auto;padding:110px 0 56px}
  .hero-inner,.about-grid,.founder-grid,.contact-grid,.lining-grid{grid-template-columns:1fr;gap:44px}
  .hero-photo{justify-self:start;max-width:none;aspect-ratio:4/3;max-height:none}
  .hero-photo img{object-position:50% 52%}
  .pillars,.cases{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr;row-gap:8px}
  .process{grid-template-columns:1fr 1fr 1fr;row-gap:30px}.process::before{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .portrait{max-width:360px;aspect-ratio:1/1}
}
@media(max-width:640px){
  .container{padding:0 16px}
  .section{padding:72px 0}
  .sec-head{margin-bottom:40px}
  .hero h1{font-size:34px}
  .hero p{font-size:16px}
  .stat dd{font-size:32px}
  .tech,.checks,.cred,.row,.care,.certs{grid-template-columns:1fr}
  .wordmarks{grid-template-columns:1fr 1fr}
  .wordmarks li{min-height:76px;font-size:16px}
  .wordmarks li:nth-child(n){border-left:0;border-top:1px solid #ece6dc}
  .wordmarks li:nth-child(even){border-left:1px solid #ece6dc}
  .wordmarks li:nth-child(-n+2){border-top:0}
  .benefits{grid-template-columns:1fr 1fr}
  .benefits div:nth-child(3){border-left:0}
  .benefits div:nth-child(n+3){border-top:1px solid var(--line)}
  .benefits div{font-size:15px}
  .process{grid-template-columns:1fr 1fr}
  .pillar{padding:36px 24px}
  form{padding:24px}
  .lining-diagram{padding:18px 16px 16px}
  .fact-card dl{padding:6px 20px 16px}.fact-head{padding:20px}
  .fact-card dl div{grid-template-columns:84px 1fr}
  .foot-grid{grid-template-columns:1fr}
  .logo-text small{display:none}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.js .reveal{opacity:1;transform:none}}