/* ===== 基础变量 ===== */
:root{
  --bg:#0a0a0a;
  --bg-soft:#111111;
  --bg-card:#141414;
  --accent:#e2ff3e;
  --accent-dim:rgba(226,255,62,.12);
  --text:#ffffff;
  --text-silver:#9ca3af;
  --text-mute:#6b7280;
  --border:rgba(255,255,255,.08);
  --border-strong:rgba(255,255,255,.16);
  --radius:14px;
  --maxw:1240px;
  --ff-sans:'Inter','Noto Sans SC','PingFang SC',sans-serif;
  --ff-disp:'Space Grotesk','Inter','Noto Sans SC',sans-serif;
  --ff-zh:'Noto Sans SC','PingFang SC',sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--ff-sans);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
html[data-lang="en"] body{font-family:var(--ff-sans)}
html[data-lang="zh"] body{font-family:var(--ff-zh)}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:all .4s var(--ease);background:rgba(10,10,10,.4);backdrop-filter:blur(12px);border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(10,10,10,.85);border-bottom-color:var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand-mark{font-family:var(--ff-disp);font-weight:700;font-size:18px;letter-spacing:.12em;color:var(--accent)}
.brand-sub{font-size:13px;color:var(--text-silver)}
.nav-links{display:flex;gap:36px;list-style:none}
.nav-links a{font-size:14px;color:var(--text-silver);transition:color .25s;position:relative}
.nav-links a:hover{color:var(--accent)}
.nav-actions{display:flex;align-items:center;gap:16px}
.lang-toggle{
  background:transparent;border:1px solid var(--border-strong);color:var(--text);
  padding:6px 14px;border-radius:999px;font-family:var(--ff-disp);font-size:12px;font-weight:600;
  letter-spacing:.08em;cursor:pointer;transition:all .25s
}
.lang-toggle:hover{border-color:var(--accent);color:var(--accent)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text);transition:.3s}

/* ===== 按钮 ===== */
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--accent);color:#0a0a0a;font-weight:600;
  padding:14px 28px;border-radius:999px;font-size:14px;letter-spacing:.02em;
  border:none;cursor:pointer;transition:all .3s var(--ease);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(226,255,62,.35)}
.btn-sm{padding:10px 20px;font-size:13px}
.btn-lg{padding:18px 40px;font-size:15px}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding-top:72px;overflow:hidden}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 75%);opacity:.5}
.hero-content{position:relative;z-index:2;text-align:center;flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center}
.hero-eyebrow{font-family:var(--ff-disp);font-size:14px;letter-spacing:.3em;color:var(--accent);text-transform:uppercase;margin-bottom:24px}
.hero-title{font-family:var(--ff-disp);font-size:clamp(40px,8vw,96px);font-weight:700;line-height:1.05;letter-spacing:-.02em;margin-bottom:28px}
.hero-sub{font-size:clamp(15px,2.2vw,20px);color:var(--text-silver);max-width:680px;margin-bottom:40px;line-height:1.7}
.hero-stats{position:relative;z-index:2;display:flex;flex-wrap:wrap;justify-content:center;gap:0;border-top:1px solid var(--border);max-width:var(--maxw);margin:0 auto;width:100%}
.stat{flex:1;min-width:160px;padding:28px 20px;text-align:center;border-right:1px solid var(--border)}
.stat:last-child{border-right:none}
.stat-value{font-family:var(--ff-disp);font-size:clamp(24px,3.5vw,40px);font-weight:700;color:var(--accent);line-height:1}
.stat-label{font-size:12px;color:var(--text-silver);margin-top:10px;letter-spacing:.05em;text-transform:uppercase}

/* ===== 通用 section ===== */
.section{padding:120px 0;position:relative}
.section-dark{background:var(--bg-soft)}
.section-cta{background:linear-gradient(180deg,var(--bg) 0%,#0d0d0d 100%)}
.section-head{text-align:center;max-width:760px;margin:0 auto 72px}
.section-tag{display:inline-block;font-family:var(--ff-disp);font-size:12px;letter-spacing:.25em;color:var(--accent);text-transform:uppercase;margin-bottom:18px;padding:6px 16px;border:1px solid var(--accent-dim);border-radius:999px;background:var(--accent-dim)}
.section-title{font-family:var(--ff-disp);font-size:clamp(30px,5vw,52px);font-weight:700;line-height:1.15;margin-bottom:20px;letter-spacing:-.01em}
.section-desc{font-size:16px;color:var(--text-silver);line-height:1.8}
.section-desc strong{color:var(--accent);font-weight:600}

/* ===== 产品网格 ===== */
.product-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.product-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .4s var(--ease)}
.product-card:hover{border-color:var(--accent);transform:translateY(-6px)}
.product-img{aspect-ratio:4/3;overflow:hidden;background:#1a1a1a}
.product-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.product-card:hover .product-img img{transform:scale(1.05)}
.product-info{padding:28px;position:relative}
.product-num{font-family:var(--ff-disp);font-size:13px;color:var(--accent);letter-spacing:.15em}
.product-info h3{font-family:var(--ff-disp);font-size:22px;font-weight:600;margin:10px 0 12px}
.product-info p{font-size:14px;color:var(--text-silver);line-height:1.7}

/* ===== 技术参数 ===== */
.specs-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:48px}
.spec-cell{background:var(--bg-card);padding:36px 20px;text-align:center;transition:background .3s}
.spec-cell:hover{background:#1a1a1a}
.spec-value{font-family:var(--ff-disp);font-size:clamp(22px,3vw,34px);font-weight:700;color:var(--accent);line-height:1}
.spec-label{font-size:12px;color:var(--text-silver);margin-top:12px;letter-spacing:.06em}
.specs-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:56px}
.feat{display:flex;gap:16px;padding:28px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius)}
.feat-icon{font-size:24px;color:var(--accent);line-height:1}
.feat h4{font-family:var(--ff-disp);font-size:16px;font-weight:600;margin-bottom:6px}
.feat p{font-size:13px;color:var(--text-silver)}
.product-hero{text-align:center}
.product-hero img{max-height:420px;width:auto;margin:0 auto;border-radius:var(--radius);border:1px solid var(--border)}

/* ===== 材质工艺 ===== */
.materials-content{max-width:780px;margin:0 auto}
.materials-content p{font-size:clamp(16px,2vw,20px);color:var(--text-silver);line-height:1.9;margin-bottom:32px}
.materials-content p.highlight{color:var(--text);font-weight:500;padding-left:24px;border-left:3px solid var(--accent)}

/* ===== 制造实力 ===== */
.section-facility{background:var(--bg-soft)}
.facility-hero{margin-bottom:48px}
.facility-hero-img{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);aspect-ratio:21/9}
.facility-hero-img img{width:100%;height:100%;object-fit:cover;transition:transform 8s ease;will-change:transform}
.facility-hero-img:hover img{transform:scale(1.06)}
.facility-hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:48px 40px;background:linear-gradient(0deg, rgba(0,0,0,.75) 0%, transparent 60%);pointer-events:none}
.facility-badge{display:inline-block;font-family:var(--ff-disp);font-size:11px;letter-spacing:.2em;color:var(--accent);text-transform:uppercase;margin-bottom:12px;padding:4px 12px;border:1px solid var(--accent-dim);border-radius:999px;background:var(--accent-dim);width:max-content}
.facility-hero-overlay h3{font-family:var(--ff-disp);font-size:clamp(24px,4vw,42px);font-weight:700;line-height:1.1;margin-bottom:8px}
.facility-hero-overlay p{font-size:15px;color:var(--text-silver);max-width:520px}

.facility-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-bottom:48px}
.facility-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .4s var(--ease)}
.facility-card:hover{border-color:var(--accent);transform:translateY(-6px)}
.facility-img{aspect-ratio:16/10;overflow:hidden;background:#1a1a1a}
.facility-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.facility-card:hover .facility-img img{transform:scale(1.05)}
.facility-info{padding:28px;position:relative}
.facility-num{font-family:var(--ff-disp);font-size:13px;color:var(--accent);letter-spacing:.15em}
.facility-info h3{font-family:var(--ff-disp);font-size:22px;font-weight:600;margin:10px 0 12px}
.facility-info p{font-size:14px;color:var(--text-silver);line-height:1.7}

.facility-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.fstat{background:var(--bg-card);padding:36px 20px;text-align:center;transition:background .3s}
.fstat:hover{background:#1a1a1a}
.fstat strong{font-family:var(--ff-disp);display:block;font-size:clamp(22px,3vw,34px);font-weight:700;color:var(--accent);line-height:1;margin-bottom:8px}
.fstat span{font-size:12px;color:var(--text-silver);letter-spacing:.06em}

/* ===== 联系 ===== */
.contact-wrap{text-align:center;max-width:680px;margin:0 auto}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:48px 0 40px}
.contact-card{display:flex;flex-direction:column;gap:6px;padding:24px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);transition:all .3s}
.contact-card:hover{border-color:var(--accent)}
.contact-label{font-size:12px;color:var(--text-mute);letter-spacing:.08em;text-transform:uppercase}
.contact-value{font-family:var(--ff-disp);font-size:15px;font-weight:500;color:var(--text)}

/* ===== 页脚 ===== */
.footer{background:#060606;border-top:1px solid var(--border);padding:80px 0 0}
.footer-inner{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;padding-bottom:56px}
.footer-col .brand-mark{font-size:22px}
.footer-desc{font-size:13px;color:var(--text-silver);margin-top:14px;max-width:280px;line-height:1.7}
.footer-col h4{font-family:var(--ff-disp);font-size:14px;font-weight:600;margin-bottom:18px;letter-spacing:.05em}
.footer-col ul{list-style:none}
.footer-col li,.footer-col p{font-size:13px;color:var(--text-silver);margin-bottom:10px;transition:color .25s}
.footer-col li:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid var(--border);padding:24px 0;text-align:center;font-size:13px;color:var(--text-mute)}

/* ===== 滚动动画 ===== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:rgba(10,10,10,.97);padding:24px;gap:20px;border-bottom:1px solid var(--border)}
  .nav-actions .btn-primary{display:none}
  .product-grid{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:repeat(2,1fr)}
  .specs-features{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:80px 0}
  .stat{min-width:50%;border-bottom:1px solid var(--border)}
  .facility-grid{grid-template-columns:1fr}
  .facility-stats{grid-template-columns:repeat(2,1fr)}
  .facility-hero-overlay{padding:24px 20px}
}
@media(max-width:560px){
  .specs-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .hero-title{font-size:44px}
}