/* =========================================================
   上海广列国际贸易有限公司 — 网站重设计样式
   设计基调：现代钢贸 / 深蓝钢色 + 暖橙金属强调色
   ========================================================= */

:root{
  --steel-950:#0a1422;
  --steel-900:#0f1d30;
  --steel-800:#16273d;
  --steel-700:#1f3a5c;
  --steel-600:#27527f;
  --steel-500:#2f6fb3;
  --steel-400:#4f8fd6;
  --accent:#f5a524;        /* 暖橙 / 热钢强调色 */
  --accent-600:#e08a0c;
  --accent-soft:#fff4e0;
  --ink:#16243a;
  --muted:#5d6e82;
  --line:#e4eaf1;
  --bg:#ffffff;
  --bg-soft:#f5f8fc;
  --bg-deep:#0c1726;
  --radius:14px;
  --radius-sm:10px;
  --shadow-sm:0 2px 10px rgba(15,29,48,.06);
  --shadow:0 14px 40px rgba(15,29,48,.12);
  --shadow-lg:0 24px 60px rgba(15,29,48,.18);
  --maxw:1200px;
  --nav-h:72px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
a{color:inherit;text-decoration:none;transition:color .2s,background .2s}
img{max-width:100%;display:block}
ul{list-style:none}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}
.container-narrow{max-width:980px}

/* ---------- 通用文字 ---------- */
.eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:.18em;
  color:var(--accent-600);text-transform:uppercase;margin-bottom:14px;
  padding:5px 12px;border:1px solid rgba(245,165,36,.4);border-radius:999px;
  background:var(--accent-soft);
}
.section-title{
  font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.01em;
  color:var(--steel-900);line-height:1.25;
}
.section-title .hl{color:var(--accent-600)}
.lead{color:var(--muted);font-size:17px;max-width:680px}
.section-head{margin-bottom:48px}
.section-head.center{text-align:center}
.section-head.center .lead{margin-left:auto;margin-right:auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;border:none;
  font-family:inherit;font-size:15px;font-weight:700;padding:13px 26px;border-radius:999px;
  transition:transform .18s,box-shadow .18s,background .18s;white-space:nowrap;
}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-600));color:#fff;box-shadow:0 10px 24px rgba(224,138,12,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(224,138,12,.42)}
.btn-ghost{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.2);transform:translateY(-2px)}
.btn-outline{background:#fff;color:var(--steel-700);border:1.5px solid var(--line)}
.btn-outline:hover{border-color:var(--steel-400);color:var(--steel-500);transform:translateY(-2px)}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(3px)}

/* =========================================================
   导航
   ========================================================= */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  display:flex;align-items:center;
  background:rgba(10,20,34,.0);
  transition:background .3s,box-shadow .3s;
}
.site-header.scrolled{
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(12px);
  box-shadow:0 1px 0 rgba(15,29,48,.08),0 6px 24px rgba(15,29,48,.06);
}
.nav-inner{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;color:#fff;transition:color .3s}
.site-header.scrolled .brand{color:var(--steel-900)}
.brand .logo{
  height:42px;width:auto;flex:none;border-radius:10px;
  background:#fff;padding:4px;
  box-shadow:0 6px 16px rgba(15,29,48,.22);
  transition:box-shadow .3s,background .3s;
}
.site-header.scrolled .brand .logo{background:#fff;box-shadow:0 4px 12px rgba(15,29,48,.10)}
.brand .name{display:flex;flex-direction:column;line-height:1.1}
.brand .name b{font-size:18px;letter-spacing:.02em}
.brand .name span{font-size:11px;font-weight:600;letter-spacing:.16em;opacity:.7}

.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  color:rgba(255,255,255,.85);font-weight:600;font-size:15px;padding:9px 15px;border-radius:9px;
  position:relative;transition:color .2s,background .2s;
}
.site-header.scrolled .nav-links a{color:var(--steel-700)}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.12)}
.site-header.scrolled .nav-links a:hover{color:var(--accent-600);background:var(--accent-soft)}
.nav-links a.active{color:#fff}
.site-header.scrolled .nav-links a.active{color:var(--accent-600)}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-cta .btn{padding:10px 20px;font-size:14px}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2.5px;background:#fff;border-radius:2px;transition:.3s}
.site-header.scrolled .nav-toggle span{background:var(--steel-800)}
.nav-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* =========================================================
   英雄区
   ========================================================= */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  background:
    radial-gradient(1200px 600px at 78% 12%,rgba(47,111,179,.45),transparent 60%),
    radial-gradient(900px 500px at 10% 90%,rgba(245,165,36,.18),transparent 55%),
    linear-gradient(160deg,var(--steel-950),var(--steel-800) 60%,var(--steel-700));
  color:#fff;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:
    repeating-linear-gradient(115deg,rgba(255,255,255,.04) 0 2px,transparent 2px 34px);
  mask-image:linear-gradient(to bottom,transparent,#000 30%,#000 70%,transparent);
}
.hero-glow{
  position:absolute;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(245,165,36,.28),transparent 65%);
  right:-120px;top:8%;filter:blur(10px);animation:float 9s ease-in-out infinite;
}
@keyframes float{50%{transform:translateY(30px)}}
.hero-inner{position:relative;z-index:2;padding:120px 0 90px;width:100%}
.hero .eyebrow{background:rgba(245,165,36,.14);border-color:rgba(245,165,36,.5);color:var(--accent)}
.hero h1{
  font-size:clamp(34px,5.2vw,62px);line-height:1.12;font-weight:800;letter-spacing:-.02em;
  margin:18px 0 22px;max-width:14ch;
}
.hero h1 .hl{color:var(--accent)}
.hero p.sub{font-size:clamp(16px,1.5vw,20px);color:rgba(255,255,255,.82);max-width:56ch;margin-bottom:34px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:54px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:760px;
  border-top:1px solid rgba(255,255,255,.14);padding-top:30px;
}
.hero-stats .stat .num{font-size:clamp(24px,3vw,36px);font-weight:800;color:#fff}
.hero-stats .stat .num small{color:var(--accent);font-size:.6em;margin-left:2px}
.hero-stats .stat .lab{font-size:13px;color:rgba(255,255,255,.66);margin-top:4px}

/* 浮动钢材卡片装饰 */
.hero-card{
  position:absolute;right:5%;top:50%;transform:translateY(-50%);width:320px;z-index:2;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);
  border-radius:18px;padding:24px;backdrop-filter:blur(8px);box-shadow:var(--shadow-lg);
}
.hero-card .tag{font-size:12px;letter-spacing:.16em;color:var(--accent);font-weight:700}
.hero-card h3{font-size:21px;margin:10px 0 16px}
.hero-card .coil{height:8px;border-radius:6px;background:linear-gradient(90deg,var(--accent),var(--steel-400));margin-bottom:8px}
.hero-card .row{display:flex;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.75);padding:7px 0;border-bottom:1px dashed rgba(255,255,255,.12)}
.hero-card .row:last-child{border-bottom:none}

/* =========================================================
   区块通用
   ========================================================= */
.section{padding:96px 0}
.section.soft{background:var(--bg-soft)}
.section.alt{background:linear-gradient(180deg,#fff,var(--bg-soft))}

/* 核心业务 — 无取向硅钢 */
.feature-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}
.feature-copy h2{font-size:clamp(26px,3vw,38px);font-weight:800;color:var(--steel-900);line-height:1.25;margin-bottom:18px}
.feature-copy .hl{color:var(--accent-600)}
.feature-copy p{color:var(--muted);margin-bottom:18px}
.feature-list{display:grid;gap:14px;margin-top:8px}
.feature-list li{display:flex;gap:12px;align-items:flex-start;font-size:15.5px;color:var(--ink)}
.feature-list .ic{flex:none;width:26px;height:26px;border-radius:8px;background:var(--accent-soft);color:var(--accent-600);display:grid;place-items:center;font-weight:800;font-size:14px;margin-top:2px}

.brand-panel{
  background:linear-gradient(160deg,var(--steel-800),var(--steel-900));
  border-radius:20px;padding:34px;color:#fff;box-shadow:var(--shadow);
}
.brand-panel .ttl{font-size:13px;letter-spacing:.16em;color:var(--accent);font-weight:700;margin-bottom:18px}
.brand-chips{display:flex;flex-wrap:wrap;gap:12px}
.brand-chips .chip{
  padding:11px 18px;border-radius:11px;background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.14);font-weight:700;font-size:15px;
}
.brand-chips .chip.hot{background:var(--accent);color:#3a2400;border-color:var(--accent)}
.brand-panel .note{margin-top:22px;font-size:13.5px;color:rgba(255,255,255,.7);border-top:1px solid rgba(255,255,255,.12);padding-top:16px}

/* 库存覆盖 — 五大基地 */
.region-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.region-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;text-align:center;
  transition:transform .2s,box-shadow .2s,border-color .2s;position:relative;overflow:hidden;
}
.region-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--steel-500),var(--accent));transform:scaleX(0);transform-origin:left;transition:transform .3s}
.region-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.region-card:hover::before{transform:scaleX(1)}
.region-card .pin{width:46px;height:46px;margin:0 auto 14px;border-radius:13px;background:var(--steel-500);color:#fff;display:grid;place-items:center;font-size:22px;box-shadow:0 8px 18px rgba(47,111,179,.35)}
.region-card h4{font-size:19px;color:var(--steel-900);margin-bottom:6px}
.region-card p{font-size:13.5px;color:var(--muted)}
.region-card .stock{display:inline-block;margin-top:12px;font-size:12px;font-weight:700;color:var(--accent-600);background:var(--accent-soft);padding:4px 12px;border-radius:999px}

.inventory-cta{
  margin-top:46px;display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between;
  background:linear-gradient(120deg,var(--steel-900),var(--steel-700));color:#fff;border-radius:18px;padding:30px 36px;
}
.inventory-cta p{font-size:16px;color:rgba(255,255,255,.85);max-width:60ch}
.inventory-cta .btn-ghost{border-color:rgba(255,255,255,.4)}

/* 库存地图可视化 */
.inventory-map-section{padding-top:36px;padding-bottom:28px}
.inventory-map-wrap{
  display:grid;grid-template-columns:2fr 1fr;gap:30px;align-items:stretch;
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:var(--shadow);
}
.map-col{min-height:0;display:flex;flex-direction:column}
.china-map{width:100%;height:520px;border-radius:14px;overflow:hidden;background:#f8fafc}
.map-note{margin-top:10px;font-size:12px;color:var(--muted);text-align:center}
.chart-col{display:flex;flex-direction:column;justify-content:center;min-height:0;border-left:1px solid var(--line);padding-left:30px}
.chart-col h3{font-size:18px;color:var(--steel-900);margin-bottom:6px;text-align:center}
.pie-chart{width:100%;height:340px}
.region-total{
  display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px;
  background:var(--steel-soft);border-radius:14px;padding:16px 12px;text-align:center;
}
.region-total .rt-item{display:flex;flex-direction:column;gap:4px}
.region-total .rt-item b{font-size:22px;color:var(--steel-700);line-height:1}
.region-total .rt-item span{font-size:12px;color:var(--muted)}

@media(max-width:1024px){
  .inventory-map-wrap{grid-template-columns:1fr}
  .chart-col{border-left:none;border-top:1px solid var(--line);padding-left:0;padding-top:24px}
  .china-map{height:420px}
}
@media(max-width:640px){
  .china-map{height:320px}
  .pie-chart{height:260px}
  .region-total{grid-template-columns:1fr 1fr}
}

/* 产品中心 */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.product-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:transform .22s,box-shadow .22s;display:flex;flex-direction:column;
}
.product-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.product-thumb{aspect-ratio:4/3;background:linear-gradient(135deg,var(--steel-700),var(--steel-900));position:relative;overflow:hidden;display:grid;place-items:center}
.product-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s;z-index:1}
.product-card:hover .product-thumb img{transform:scale(1.06)}
.product-thumb .thumb-mark{position:relative;z-index:0;font-size:36px;font-weight:800;color:rgba(255,255,255,.85);text-shadow:0 4px 18px rgba(0,0,0,.25)}
.product-thumb .cat{position:absolute;left:14px;top:14px;background:rgba(10,20,34,.7);color:#fff;font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px;backdrop-filter:blur(4px)}
.product-body{padding:22px 22px 26px;display:flex;flex-direction:column;flex:1}
.product-body h3{font-size:19px;color:var(--steel-900);margin-bottom:10px}
.product-body p{color:var(--muted);font-size:14.5px;margin-bottom:16px;flex:1}
.product-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.product-tags span{font-size:12.5px;color:var(--steel-700);background:var(--bg-soft);border:1px solid var(--line);padding:4px 11px;border-radius:999px}
.product-body .more{font-weight:700;color:var(--accent-600);font-size:14.5px;display:inline-flex;align-items:center;gap:6px}
.placeholder-thumb{width:78px;height:78px;border-radius:18px;background:linear-gradient(135deg,var(--steel-500),var(--accent));display:grid;place-items:center;color:#fff;font-size:30px;font-weight:800;box-shadow:var(--shadow)}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.about-visual{position:relative;border-radius:20px;overflow:hidden;min-height:380px;background:linear-gradient(150deg,var(--steel-800),var(--steel-950));display:grid;place-items:center;color:#fff}
.about-visual .big{font-size:120px;font-weight:900;color:rgba(255,255,255,.08);line-height:1}
.about-visual .vt{position:absolute;text-align:center}
.about-visual .vt .y{font-size:54px;font-weight:900;color:var(--accent)}
.about-visual .vt .t{letter-spacing:.2em;font-size:13px;opacity:.8}
.metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
.metric{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:20px;text-align:center}
.metric .n{font-size:30px;font-weight:800;color:var(--steel-700)}
.metric .l{font-size:13px;color:var(--muted);margin-top:4px}

/* 合作伙伴 */
.partner-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.partner-card{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px;display:flex;align-items:center;gap:16px;
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.partner-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.partner-card .logo-box{width:58px;height:58px;border-radius:13px;background:linear-gradient(135deg,var(--steel-500),var(--steel-700));color:#fff;display:grid;place-items:center;font-weight:900;font-size:18px;flex:none;box-shadow:0 8px 18px rgba(47,111,179,.3)}
.partner-card .pname{font-size:17px;font-weight:700;color:var(--steel-900)}
.partner-card .ptag{font-size:13px;color:var(--muted)}

/* 新闻 */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .2s,box-shadow .2s}
.news-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.news-thumb{aspect-ratio:16/9;background:linear-gradient(135deg,var(--steel-700),var(--steel-900));display:grid;place-items:center;color:rgba(255,255,255,.25);font-size:34px}
.news-body{padding:20px 22px 24px}
.news-body .date{font-size:12.5px;color:var(--accent-600);font-weight:700;letter-spacing:.05em}
.news-body h3{font-size:17px;color:var(--steel-900);margin:8px 0 8px;line-height:1.4}
.news-body p{font-size:14px;color:var(--muted)}

/* 联系 CTA */
.contact-band{background:linear-gradient(120deg,var(--steel-900),var(--steel-700));color:#fff;border-radius:22px;padding:54px;display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:center;position:relative;overflow:hidden}
.contact-band::after{content:"";position:absolute;right:-60px;bottom:-60px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(245,165,36,.25),transparent 65%)}
.contact-band h2{font-size:clamp(26px,3vw,38px);font-weight:800;margin-bottom:14px}
.contact-band p{color:rgba(255,255,255,.82);margin-bottom:26px;max-width:46ch}
.contact-info{display:grid;gap:16px;position:relative;z-index:2}
.contact-info .ci{display:flex;gap:14px;align-items:flex-start;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:16px 18px}
.contact-info .ci .ic{width:40px;height:40px;border-radius:10px;background:var(--accent);color:#3a2400;display:grid;place-items:center;font-size:18px;flex:none}
.contact-info .ci b{display:block;font-size:12px;color:rgba(255,255,255,.6);font-weight:600;letter-spacing:.06em}
.contact-info .ci a,.contact-info .ci span{font-size:16px;font-weight:700;color:#fff}

/* 联系表单页 */
.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:start}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow-sm)}
.contact-form h3{font-size:22px;color:var(--steel-900);margin-bottom:6px}
.contact-form .sub{color:var(--muted);margin-bottom:24px;font-size:14.5px}
.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;font-weight:700;color:var(--steel-700);margin-bottom:7px}
.field input,.field textarea{
  width:100%;font-family:inherit;font-size:15px;padding:13px 15px;border:1.5px solid var(--line);border-radius:10px;
  background:var(--bg-soft);transition:border-color .2s,background .2s;color:var(--ink);
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--steel-400);background:#fff}
.field textarea{resize:vertical;min-height:120px}
.form-note{font-size:12.5px;color:var(--muted);margin-top:4px}
.region-list{display:grid;gap:14px}
.region-list .ri{display:flex;gap:14px;align-items:flex-start;background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.region-list .ri .dot{width:12px;height:12px;border-radius:50%;background:var(--accent);margin-top:6px;flex:none;box-shadow:0 0 0 4px var(--accent-soft)}
.region-list .ri b{color:var(--steel-900)}
.region-list .ri p{font-size:13.5px;color:var(--muted);margin-top:2px}

/* 面包屑 / 内页头 */
.page-hero{background:linear-gradient(150deg,var(--steel-900),var(--steel-700));color:#fff;padding:130px 0 64px;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;opacity:.4;background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.05) 0 2px,transparent 2px 36px)}
.page-hero .container{position:relative;z-index:2}
.page-hero h1{font-size:clamp(30px,4vw,46px);font-weight:800;margin-bottom:10px}
.page-hero .crumb{font-size:13.5px;color:rgba(255,255,255,.65)}
.page-hero .crumb a:hover{color:#fff}

/* 页脚 */
.site-footer{background:var(--bg-deep);color:rgba(255,255,255,.72);padding:64px 0 28px}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:42px}
.footer-brand .logo{height:54px;width:auto;border-radius:12px;background:#fff;padding:5px;margin-bottom:14px;box-shadow:0 6px 18px rgba(0,0,0,.18)}
.footer-brand .name{font-size:18px;font-weight:800;color:#fff}
.footer-brand p{margin-top:12px;font-size:14px;color:rgba(255,255,255,.6);max-width:34ch}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.04em}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,.66);padding:6px 0;transition:color .2s,padding .2s}
.footer-col a:hover{color:var(--accent);padding-left:5px}
.footer-col p{font-size:14px;color:rgba(255,255,255,.66);line-height:1.9}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.5)}
.footer-bottom a{color:rgba(255,255,255,.6)}
.footer-bottom a:hover{color:var(--accent)}

/* 滚动揭示动画 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1080px){
  .region-grid{grid-template-columns:repeat(3,1fr)}
  .product-grid,.news-grid,.partner-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid,.about-grid,.contact-band,.contact-layout{grid-template-columns:1fr;gap:36px}
  .hero-card{display:none}
}
@media (max-width:860px){
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;background:#fff;flex-direction:column;gap:0;
    padding:14px 18px 22px;box-shadow:var(--shadow);transform:translateY(-120%);transition:transform .3s;align-items:stretch;
  }
  .nav-links.open{transform:translateY(0)}
  .nav-links a{color:var(--steel-800)!important;padding:13px 12px;border-bottom:1px solid var(--line)}
  .nav-links a:hover{background:var(--bg-soft)}
  .nav-cta .btn-desktop{display:none}
  .nav-toggle{display:flex}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:22px}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  .section{padding:64px 0}
  .region-grid,.product-grid,.news-grid,.partner-grid{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  .metric-row{grid-template-columns:1fr}
  .contact-band{padding:34px 24px}
  .hero-inner{padding:130px 0 70px}
}
@media (max-width:430px){
  .region-grid,.product-grid,.news-grid{grid-template-columns:1fr}
}