:root{
  --text:#1d1d1f;
  --muted:#6e6e73;
  --line:#dedee2;
  --soft:#f5f5f7;
  --white:#fff;
  --dark:#1f2023;
  --accent:#2f3033;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  background:var(--soft);
  font-family:Inter,"Microsoft YaHei","PingFang SC",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{width:min(100% - 40px,1380px);margin-inline:auto}
.site-header{
  position:fixed;
  z-index:50;
  top:0;
  left:0;
  right:0;
  height:68px;
  background:rgba(250,250,252,.92);
  border-bottom:1px solid rgba(0,0,0,.08);
  backdrop-filter:blur(18px);
}
.header-inner{height:100%;display:flex;align-items:center;gap:28px}
.logo{
  width:182px;
  height:52px;
  flex:0 0 182px;
  background:#fff url("../assets/brand/nuoyan-logo.png") center/182px auto no-repeat;
}
.header-nav{margin-left:auto;display:flex;align-items:center;gap:26px;color:#343438;font-size:14px;font-weight:700}
.header-nav a:hover{color:#000}
.header-back{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:36px;
  padding:0 17px;
  border-radius:999px;
  color:#fff!important;
  background:#28282a;
}
.category-hero{
  position:relative;
  min-height:min(82vh,860px);
  margin-top:68px;
  overflow:hidden;
  background:linear-gradient(135deg,#f8fafc 0%,#edf1f5 58%,#e4e9ee 100%);
  isolation:isolate;
}
.category-hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(90deg,rgba(248,250,252,.96) 0%,rgba(248,250,252,.84) 28%,rgba(248,250,252,.16) 59%,transparent 75%);
}
.category-hero img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:contain;
  object-position:right center;
}
.hero-copy{
  position:relative;
  z-index:2;
  min-height:min(82vh,860px);
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  justify-content:center;
  width:min(46%,620px);
  padding:56px 0;
}
.eyebrow{
  margin-bottom:14px;
  color:#77777c;
  font-size:12px;
  font-weight:900;
  letter-spacing:.17em;
}
.hero-copy h1{margin:0;font-size:clamp(44px,5vw,78px);line-height:1;letter-spacing:-.055em}
.hero-copy p{max-width:570px;margin:22px 0 30px;color:#55565a;font-size:18px;line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:0 22px;
  border-radius:999px;
  background:#242426;
  color:#fff;
  font-size:14px;
  font-weight:800;
  transition:.25s ease;
}
.button:hover{background:#000;transform:translateY(-2px)}
.button.secondary{background:rgba(255,255,255,.78);border:1px solid #d3d3d7;color:#2f3033}
.button.secondary:hover{background:#fff}
.case-section{padding:86px 0 96px}
.section-head{display:grid;grid-template-columns:1fr minmax(280px,520px);gap:40px;align-items:end;margin-bottom:34px}
.section-head span{color:#7b7b80;font-size:12px;font-weight:900;letter-spacing:.16em}
.section-head h2{margin:10px 0 0;font-size:clamp(36px,4vw,58px);letter-spacing:-.05em}
.section-head p{margin:0;color:var(--muted);font-size:16px;line-height:1.8}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.case-card{
  position:relative;
  min-height:300px;
  padding:30px;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:24px;
  background:linear-gradient(145deg,#fff,#eeeeF1);
  box-shadow:0 18px 48px rgba(0,0,0,.06);
}
.case-card::after{
  content:"";
  position:absolute;
  right:-48px;
  bottom:-56px;
  width:180px;
  height:180px;
  border:1px solid #d9d9de;
  border-radius:50%;
  box-shadow:0 0 0 24px rgba(220,220,225,.22),0 0 0 52px rgba(220,220,225,.12);
}
.case-number{display:block;color:#8a8a90;font-size:12px;font-weight:900;letter-spacing:.16em}
.case-card h3{position:relative;z-index:1;margin:80px 0 12px;font-size:25px}
.case-card p{position:relative;z-index:1;max-width:260px;margin:0;color:var(--muted);line-height:1.75}
.interactive-case-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;
}
.interactive-case{
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:26px;
  background:#fff;
  box-shadow:0 20px 56px rgba(0,0,0,.08);
  transition:transform .3s ease,box-shadow .3s ease;
}
.interactive-case:hover{
  transform:translateY(-4px);
  box-shadow:0 28px 70px rgba(0,0,0,.12);
}
.interactive-frame{
  position:relative;
  aspect-ratio:2.04 / 1;
  height:auto;
  overflow:hidden;
  background:linear-gradient(145deg,#e9edf1,#d8dde2);
}
.interactive-frame iframe{
  display:block;
  width:100%;
  height:100%;
  border:0;
  background:#e7ebef;
}
.interactive-frame.model-view iframe{
  position:absolute;
  left:50%;
  top:50%;
  width:calc(100% * var(--model-zoom,1));
  height:calc(100% * var(--model-zoom,1));
  max-width:none;
  transform:translate(-50%,-50%);
}
.model-view-earphone{--model-zoom:6}
.model-view-microwave{--model-zoom:6}
.model-view-machine{--model-zoom:1.25}
.model-view-office{--model-zoom:1.65}
.model-view-chair{--model-zoom:2.5}
.interactive-frame.model-view-chair iframe{top:72%}
.interactive-frame.is-static-preview{
  background:
    radial-gradient(circle at 50% 42%,rgba(255,255,255,.98) 0 28%,rgba(244,247,249,.96) 58%,rgba(224,229,233,.98) 100%);
}
.interactive-preview-link{
  position:relative;
  z-index:1;
  display:block;
  width:100%;
  height:100%;
}
.interactive-preview-image{
  display:block;
  width:100%;
  height:100%;
  object-fit:contain;
  object-position:center;
  transition:transform .45s cubic-bezier(.2,.75,.25,1);
}
.interactive-case:hover .interactive-preview-image{transform:scale(1.025)}
.interactive-badge,
.interactive-open{
  position:absolute;
  z-index:3;
  top:18px;
  min-height:34px;
  display:inline-flex;
  align-items:center;
  border:1px solid rgba(255,255,255,.5);
  border-radius:999px;
  background:rgba(31,32,35,.82);
  color:#fff;
  box-shadow:0 8px 22px rgba(0,0,0,.16);
  backdrop-filter:blur(12px);
}
.interactive-badge{
  left:18px;
  padding:0 13px;
  font-size:10px;
  font-weight:900;
  letter-spacing:.13em;
}
.interactive-open{
  right:18px;
  padding:0 14px;
  font-size:12px;
  font-weight:800;
  transition:.2s ease;
}
.interactive-open:hover{background:#000;transform:translateY(-1px)}
.interactive-body{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:28px;
  min-height:190px;
  padding:28px 30px 30px;
}
.interactive-body h3{
  margin:10px 0 10px;
  font-size:32px;
  letter-spacing:-.04em;
}
.interactive-body p{
  max-width:440px;
  margin:0;
  color:var(--muted);
  line-height:1.75;
}
.case-button{
  flex:0 0 auto;
  min-height:44px;
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:0 18px;
  border:1px solid #d3d3d7;
  border-radius:999px;
  color:#2f3033;
  font-size:13px;
  font-weight:800;
  transition:.22s ease;
}
.case-button span{font-size:16px}
.case-button:hover{border-color:#242426;background:#242426;color:#fff}
.reserved{
  margin-top:18px;
  padding:22px 24px;
  border:1px solid #d9d9dd;
  border-radius:18px;
  background:#fff;
  color:#55565a;
  line-height:1.7;
}
.reserved strong{color:#1d1d1f}
.contact-band{padding:76px 0;background:#1f2023;color:#fff}
.contact-inner{display:flex;align-items:center;justify-content:space-between;gap:40px}
.contact-inner h2{margin:0;font-size:clamp(30px,3vw,48px);letter-spacing:-.04em}
.contact-inner p{margin:12px 0 0;color:#b7b7bd}
.contact-band .button{background:#fff;color:#1f2023}
.site-footer{padding:28px 0;background:#151517;color:#a8a8ae;font-size:13px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
@media(max-width:900px){
  .header-nav a:not(.header-back){display:none}
  .category-hero,.hero-copy{min-height:650px}
  .hero-copy{width:58%}
  .case-grid{grid-template-columns:1fr}
  .interactive-case-grid{grid-template-columns:1fr}
  .interactive-frame{height:auto}
  .case-card{min-height:240px}
  .case-card h3{margin-top:52px}
}
@media(max-width:640px){
  .container{width:min(100% - 28px,1380px)}
  .site-header{height:64px}
  .logo{width:154px;height:46px;flex-basis:154px;background-size:154px auto}
  .header-back{min-height:34px;padding:0 13px;font-size:12px}
  .category-hero{margin-top:64px;min-height:620px}
  .category-hero::after{background:linear-gradient(180deg,rgba(248,250,252,.96) 0%,rgba(248,250,252,.7) 42%,rgba(248,250,252,.08) 72%)}
  .category-hero img{object-position:center bottom}
  .hero-copy{width:100%;min-height:620px;justify-content:flex-start;padding-top:58px}
  .hero-copy h1{font-size:44px}
  .hero-copy p{max-width:92%;margin:16px 0 22px;font-size:15px;line-height:1.7}
  .button{min-height:42px;padding:0 17px;font-size:12px}
  .case-section{padding:58px 0 66px}
  .section-head{display:block;margin-bottom:25px}
  .section-head h2{font-size:36px}
  .section-head p{margin-top:16px;font-size:14px}
  .case-card{padding:24px;border-radius:20px}
  .interactive-case{border-radius:20px}
  .interactive-frame{height:auto}
  .interactive-badge,.interactive-open{top:12px;min-height:30px}
  .interactive-badge{left:12px;padding:0 10px;font-size:9px}
  .interactive-open{right:12px;padding:0 11px;font-size:10px}
  .interactive-body{display:block;min-height:0;padding:22px}
  .interactive-body h3{font-size:28px}
  .interactive-body p{font-size:14px}
  .case-button{margin-top:20px}
  .contact-band{padding:56px 0}
  .contact-inner{display:block}
  .contact-inner .button{margin-top:24px}
  .footer-inner{display:block;line-height:1.8}
}