:root{
  --bg:#f2eee5;
  --paper:#f8f5ee;
  --ink:#18212a;
  --muted:#606970;
  --line:#d7d0c4;
  --accent:#9b3333;
  --deep:#233445;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--ink);
  background:var(--bg);
  font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",Arial,sans-serif;
  line-height:1.72;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,textarea,select{font:inherit}

.nav{
  position:sticky;top:0;z-index:50;
  display:flex;justify-content:space-between;align-items:center;
  padding:14px 5vw;
  background:rgba(242,238,229,.96);
  border-bottom:1px solid rgba(35,52,69,.12);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{height:52px;width:auto;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-cn{font-size:20px;font-weight:700;letter-spacing:.04em;color:var(--ink)}
.brand-en{font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--muted);margin-top:5px}
nav{display:flex;gap:24px;align-items:center;font-size:14px}
nav a{
  position:relative;
  padding:8px 0;
  color:var(--ink);
}
nav a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1.5px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s ease;
}
nav a.active::after{transform:scaleX(1)}
nav a.active{color:var(--accent)}

.section{padding:80px 7vw;border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:center;gap:11px;margin-bottom:28px;flex-wrap:wrap}
.section-head.compact{margin-bottom:12px}
.section-num{font-size:12px;font-weight:700;color:var(--accent);letter-spacing:.12em}
.section-head h2{
  margin:0;
  color:var(--accent);
  font-family:inherit;
  font-size:clamp(24px,2.5vw,33px);
  line-height:1.25;
  font-weight:700;
}

/* Hero */
.hero{
  display:grid;
  grid-template-columns:1.03fr .97fr;
  gap:36px;
  align-items:center;
  min-height:72vh;
}
.top-kicker{font-size:11px;font-weight:700;color:var(--accent);letter-spacing:.16em;text-transform:uppercase}
.hero h1{
  margin:12px 0 18px;
  max-width:780px;
  font-family:inherit;
  font-size:clamp(32px,3.75vw,49px);
  line-height:1.32;
}
.hero-sub{max-width:710px;font-size:18px;color:var(--muted)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:23px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 19px;border:1px solid var(--deep);
  font-size:14px;font-weight:600;
}
.btn.primary{background:var(--deep);color:#fff}
.btn.secondary{background:transparent}
.btn.full{width:100%;margin-top:14px}
.hero-proof{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.hero-proof span{font-size:12px;color:var(--muted);padding:5px 9px;border:1px solid var(--line);background:rgba(255,255,255,.34)}

.hero-visual{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  grid-template-rows:218px 218px;
  gap:14px;
}
.photo-card{position:relative;overflow:hidden;background:#ddd}
.photo-main{grid-row:1 / span 2}
.photo-card img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(.98)}
.photo-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,25,35,.02),rgba(15,25,35,.58))}
.photo-overlay{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:20px;color:#fff}
.cn-title{font-family:inherit;font-size:27px;line-height:1.1;margin-bottom:5px}
.en-title{font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:#f0e3da}

/* Problems */
.problem-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.problem-grid article{
  padding:23px;background:rgba(248,245,238,.52);border-top:1px solid var(--deep)
}
.problem-grid h3{margin:0 0 9px;font-size:22px;line-height:1.4}
.problem-grid p{margin:0;color:var(--muted)}

/* Services */
.service-groups{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.service-group{
  background:rgba(248,245,238,.55);
  border-top:1px solid var(--deep);
  padding:22px 0 0;
}
.group-tag{
  margin-bottom:8px;
  color:var(--accent);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.service-group h3{
  margin:0 0 8px;
  font-size:22px;
  line-height:1.4;
}
.group-desc{
  margin:0 0 18px;
  color:var(--muted);
  padding-right:10px;
}
.mini-card{
  padding:18px 18px 20px;
  background:var(--paper);
  border:1px solid var(--line);
  margin-bottom:14px;
}
.mini-meta{
  font-size:11px;
  color:var(--accent);
  font-weight:700;
  letter-spacing:.06em;
  margin-bottom:10px;
  text-transform:uppercase;
}
.mini-card h4{
  margin:0 0 10px;
  font-family:inherit;
  font-size:20px;
  line-height:1.35;
}
.mini-card p{margin:0;color:var(--muted);font-size:15px}

/* Workflow */
.workflow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.workflow-grid article{padding:22px;background:rgba(248,245,238,.52);border-top:1px solid var(--deep)}
.workflow-grid article span{
  display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;
  margin-bottom:14px;border:1px solid var(--accent);color:var(--accent);font-size:11px;font-weight:700
}
.workflow-grid h3{margin:0 0 8px;font-size:21px}
.workflow-grid p{margin:0;color:var(--muted)}
.principles-bar{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin-top:18px}
.principles-bar div{padding:14px 16px;background:var(--paper);border-left:3px solid var(--accent);font-weight:600}

/* About */
.bridge-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:stretch}
.company-copy{
  display:flex;align-items:center;
  padding:26px 0;
}
.company-copy p{
  margin:0;
  max-width:740px;
  font-size:17px;
  color:var(--ink);
}
.bridge-card{background:var(--deep);color:#fff;padding:30px}
.bridge-kicker{font-size:11px;letter-spacing:.12em;color:#d7bdb6;text-transform:uppercase}
.bridge-card h3{margin:9px 0 13px;font-family:inherit;font-size:30px}

/* Team */
.team-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:34px;align-items:stretch}
.team-photo-placeholder{
  min-height:290px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(248,245,238,.42);
  border:1px dashed rgba(35,52,69,.30);
  color:#879097;
  font-size:14px;
}
.team-copy h3{margin:0 0 14px;font-size:27px;line-height:1.4}
.team-copy ul{margin:0;padding-left:20px}
.team-copy li{margin:9px 0}

/* Content */
.content-layout{
  display:grid;
  grid-template-columns:1.55fr .62fr;
  gap:20px;
  align-items:start;
}
.article-panel,.channel-panel{background:var(--paper);border:1px solid var(--line);padding:22px}
.subhead{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.06em;margin-bottom:12px}
.article-list{display:grid;gap:10px}
.article-item{
  display:block;
  padding:15px 16px;
  background:rgba(242,238,229,.66);
  border-left:2px solid var(--deep);
}
.article-meta{font-size:11px;color:var(--accent);font-weight:700;margin-bottom:5px}
.article-title{font-size:18px;font-weight:700;line-height:1.45}
.article-desc{margin-top:5px;font-size:14px;color:var(--muted)}
.channel-grid{display:grid;gap:10px}
.channel-item{
  display:grid;
  grid-template-columns:74px 1fr;
  gap:12px;
  align-items:center;
  padding:10px;
  background:rgba(242,238,229,.58);
}
.qr-image{
  width:74px;height:74px;
  object-fit:contain;
  background:#f1f1f1;
  padding:2px;
  border:1px solid #e2e2e2;
}
.channel-title{font-size:16px;font-weight:700}
.channel-sub{font-size:13px;color:var(--muted);margin-top:3px}

/* Contact */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.contact-card{background:var(--paper);padding:24px}
.contact-row{display:flex;justify-content:space-between;gap:18px;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}
.contact-row span{color:var(--muted)}

footer{
  padding:26px 7vw;
  display:flex;justify-content:space-between;gap:12px;
  color:var(--muted);font-size:12px
}

/* Tablet */
@media (max-width:1080px){
  .hero{grid-template-columns:1fr}
  .problem-grid,.bridge-grid,.team-grid,.contact,.content-layout{grid-template-columns:1fr}
  .workflow-grid{grid-template-columns:repeat(2,1fr)}
  .service-groups{grid-template-columns:1fr}
}

/* Mobile */
@media (max-width:720px){
  .nav{padding:10px 5vw;min-height:62px}
  .brand-logo{height:39px}
  .brand{gap:9px}
  .brand-cn{font-size:16px}
  .brand-en{font-size:9px;margin-top:3px}
  nav a{display:none}
  nav a[data-section="contact"]{
    display:block;
    font-size:13px;
    border:1px solid var(--deep);
    padding:7px 10px;
  }
  nav a[data-section="contact"]::after{display:none}
  nav a[data-section="contact"].active{color:var(--ink)}

  .section{padding:54px 5.5vw}
  .section-head{gap:8px;margin-bottom:22px}
  .section-num{font-size:11px}
  .section-head h2{font-size:23px}

  .hero{min-height:auto;gap:28px;padding-top:48px}
  .top-kicker{font-size:9px;letter-spacing:.10em}
  .hero h1{font-size:29px;line-height:1.36;margin:10px 0 14px}
  .hero-sub{font-size:16px}
  .btn{font-size:13px;padding:10px 14px}
  .hero-proof{gap:7px;margin-top:18px}
  .hero-proof span{font-size:10px;padding:4px 7px}

  .hero-visual{
    grid-template-columns:1fr;
    grid-template-rows:205px 155px 155px;
    gap:10px;
  }
  .photo-main{grid-row:auto}
  .photo-overlay{padding:15px}
  .cn-title{font-size:22px}
  .en-title{font-size:9px}

  .problem-grid,.workflow-grid,.content-layout,.contact{grid-template-columns:1fr}
  .problem-grid h3,.workflow-grid h3,.service-group h3,.mini-card h4{font-size:19px}
  .principles-bar{grid-template-columns:1fr}
  .company-copy{padding:10px 0}
  .company-copy p{font-size:16px}
  .bridge-card h3{font-size:26px}
  .team-grid{grid-template-columns:1fr}
  .team-photo-placeholder{min-height:220px}
  .team-copy h3{font-size:23px}

  .article-panel,.channel-panel{padding:18px}
  .article-title{font-size:16px}
  .channel-item{grid-template-columns:66px 1fr;padding:9px}
  .qr-image{width:66px;height:66px}

  .contact-row{flex-direction:column;gap:3px}
  footer{flex-direction:column;padding:23px 5.5vw}
}