/* ============================================================
   Durlink 砥连电子 · 企业官网设计系统
   Suzhou Durlink Electronics Co., Ltd.
   工业线束制造 · 深海军蓝 + 端子铜金
   ============================================================ */

:root{
  --navy-900:#0B2240;
  --navy-800:#0E2A4E;
  --navy-700:#14355F;
  --navy-600:#1B4279;
  --blue-600:#1553B0;
  --blue-500:#1E66CE;
  --copper:#C2832B;
  --copper-soft:#E7C98F;
  --paper:#F5F7FA;
  --line:#DDE4EC;
  --line-soft:#EDF1F5;
  --ink:#16202B;
  --text:#3E4E5E;
  --muted:#6B7A8A;
  --white:#FFFFFF;

  --font-display:'Archivo Narrow','Noto Sans SC','Microsoft YaHei',sans-serif;
  --font-body:'Noto Sans SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;

  --container:1200px;
  --radius:6px;
  --shadow-sm:0 1px 2px rgba(11,34,64,.06);
  --shadow-md:0 6px 18px rgba(11,34,64,.10);
  --shadow-lg:0 14px 40px rgba(11,34,64,.16);
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-body);
  color:var(--text);
  background:var(--white);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;}
a{color:var(--blue-600);text-decoration:none;}
a:hover{color:var(--navy-700);}
ul{list-style:none;}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--navy-900);line-height:1.25;font-weight:700;}
.container{width:min(var(--container),92%);margin-inline:auto;}

/* ============ 顶栏 Header（深色导航） ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--navy-900);
  backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(255,255,255,.14);
}
.header-inner{display:flex;align-items:center;gap:2rem;height:74px;padding-inline:1.25rem;}
.brand{display:flex;align-items:center;gap:.7rem;flex:none;}
.brand img{height:38px;width:auto;}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:20px;color:#fff;letter-spacing:.02em;}
.brand-name span{color:var(--copper-soft);}
.main-nav{display:flex;align-items:center;gap:.25rem;margin-left:auto;padding-right:.25rem;}
.main-nav a{
  display:inline-block;padding:.55rem .85rem;font-size:15px;font-weight:500;
  color:rgba(255,255,255,.82);border-radius:var(--radius);border-bottom:2px solid transparent;
}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.08);}
.main-nav a.active{color:#fff;border-bottom-color:var(--copper);}
.lang-switch{display:flex;align-items:center;margin-left:.75rem;border:1px solid rgba(255,255,255,.3);border-radius:999px;overflow:hidden;}
.lang-switch button{
  border:0;background:transparent;padding:.35rem .9rem;font-size:13px;cursor:pointer;
  font-family:var(--font-body);color:rgba(255,255,255,.72);transition:.2s;
}
.lang-switch button:hover{color:#fff;}
.lang-switch button.on{background:var(--copper);color:#fff;}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid rgba(255,255,255,.35);border-radius:var(--radius);width:42px;height:42px;cursor:pointer;flex:none;}
.nav-toggle svg{stroke:#fff;}

/* ============ Hero ============ */
.hero{
  position:relative;min-height:560px;display:flex;align-items:center;
  background:var(--navy-800);
  overflow:hidden;
}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;}
.hero-bg img{width:100%;height:100%;object-fit:cover;}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(11,34,64,.92) 0%,rgba(11,34,64,.62) 46%,rgba(11,34,64,.25) 100%);}
.hero-inner{position:relative;z-index:2;color:#fff;padding:90px 0;width:min(var(--container),92%);margin-inline:auto;}
.hero-badge{
  display:inline-flex;align-items:center;gap:.5rem;
  border:1px solid rgba(255,255,255,.35);border-radius:999px;
  padding:.3rem 1rem;font-size:13px;letter-spacing:.08em;color:var(--copper-soft);
  margin-bottom:1.4rem;background:rgba(11,34,64,.35);
}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--copper-soft);}
.hero h1{font-size:clamp(34px,5.2vw,60px);color:#fff;letter-spacing:.01em;max-width:16em;}
.hero .hero-sub{
  margin-top:1rem;font-size:clamp(15px,1.6vw,19px);color:rgba(255,255,255,.85);
  max-width:34em;
}
.hero-actions{display:flex;gap:1rem;margin-top:2.2rem;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.8rem 1.7rem;border-radius:var(--radius);
  font-family:var(--font-body);font-size:15px;font-weight:600;cursor:pointer;
  border:0;transition:.2s;
}
.btn-primary{background:var(--copper);color:#fff;}
.btn-primary:hover{background:#a96f1e;color:#fff;}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55);}
.btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.12);}
.btn-outline{background:transparent;color:var(--navy-800);border:1px solid var(--navy-700);}
.btn-outline:hover{background:var(--navy-800);color:#fff;}

/* ============ 区块 ============ */
.section{padding:84px 0;}
.section.alt{background:var(--paper);}
.section-head{margin-bottom:2.8rem;max-width:640px;}
.section-eyebrow{
  font-family:var(--font-display);font-size:13px;letter-spacing:.18em;
  color:var(--copper);font-weight:600;text-transform:uppercase;
}
.section-title{font-size:clamp(26px,3.2vw,34px);margin:.5rem 0 .8rem;}
.section-lead{color:var(--muted);font-size:16px;}
.section-head.center{margin-inline:auto;text-align:center;}

.grid{display:grid;gap:1.6rem;}
.g-2{grid-template-columns:repeat(2,1fr);}
.g-3{grid-template-columns:repeat(3,1fr);}
.g-4{grid-template-columns:repeat(4,1fr);}

/* 卡片 */
.card{
  background:var(--white);border:1px solid var(--line-soft);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);
  padding:1.8rem;transition:.22s;
}
.card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);}
.card .card-kicker{font-family:var(--font-display);font-size:12px;letter-spacing:.14em;color:var(--copper);font-weight:600;}
.card h3{font-size:19px;margin:.45rem 0 .6rem;}
.card p{font-size:14.5px;color:var(--muted);}
.card ul.ticks{margin-top:.9rem;}
.card ul.ticks li{font-size:13.5px;color:var(--text);padding:.18rem 0;padding-left:1.3rem;position:relative;}
.card ul.ticks li::before{
  content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;
  border-radius:2px;background:var(--copper);
}

/* 数字条 */
.stat-band{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  background:var(--navy-800);color:#fff;border-radius:var(--radius);
  box-shadow:var(--shadow-lg);overflow:hidden;
}
.stat{
  padding:2.1rem 1.6rem;text-align:center;border-left:1px solid rgba(255,255,255,.12);
}
.stat:first-child{border-left:0;}
.stat b{font-family:var(--font-display);font-size:34px;color:#fff;display:block;}
.stat b i{font-style:normal;color:var(--copper-soft);}
.stat span{font-size:13.5px;color:rgba(255,255,255,.72);letter-spacing:.04em;}

/* 产品卡 */
.prod-grid{grid-template-columns:repeat(3,1fr);gap:1.5rem;}
.prod-card{
  position:relative;background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:.22s;display:block;color:inherit;
}
.prod-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);color:inherit;}
.prod-card .thumb{aspect-ratio:4/3;overflow:hidden;background:var(--paper);}
.prod-card .thumb img{width:100%;height:100%;object-fit:cover;transition:.35s;}
.prod-card:hover .thumb img{transform:scale(1.05);}
.prod-card .body{padding:1.3rem 1.5rem 1.5rem;}
.prod-card h3{font-size:18px;}
.prod-card .en{font-family:var(--font-display);font-size:13px;color:var(--copper);letter-spacing:.06em;margin:.15rem 0 .5rem;}
.prod-card p{font-size:14px;color:var(--muted);}
.prod-card .more{margin-top:.8rem;font-size:14px;font-weight:600;color:var(--blue-600);}

/* 应用领域 */
.app-grid{grid-template-columns:repeat(3,1fr);gap:1.5rem;}
.app-item{
  display:block;border:1px solid var(--line-soft);border-radius:var(--radius);padding:1.7rem;
  background:var(--white);transition:.2s;color:inherit;position:relative;
}
.app-item:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);color:inherit;}
.app-item .ic{width:44px;height:44px;border-radius:var(--radius);background:var(--navy-800);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:1rem;}
.app-item .ic svg{width:22px;height:22px;stroke:#fff;}
.app-item h3{font-size:17px;}
.app-item p{font-size:14px;color:var(--muted);margin-top:.3rem;}

/* 质量流程 */
.qa-band{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;}
.qa-step{border:1px solid var(--line-soft);border-radius:var(--radius);padding:1.5rem;background:#fff;position:relative;}
.qa-step .no{font-family:var(--font-display);font-size:13px;color:var(--copper);letter-spacing:.2em;font-weight:700;}
.qa-step h4{font-size:17px;margin:.35rem 0 .2rem;}
.qa-step .sub{font-size:12.5px;color:var(--muted);}
.qa-step p{font-size:14px;margin-top:.6rem;color:var(--text);}

/* 时间轴 */
.timeline{display:grid;grid-template-columns:92px 1fr;gap:1.4rem;position:relative;}
.timeline::before{content:"";position:absolute;left:46px;top:8px;bottom:8px;width:1px;background:var(--line);}
.tl-item{display:contents;}
.tl-time{
  grid-column:1;font-family:var(--font-display);font-weight:700;font-size:15px;color:var(--navy-800);
  padding-top:.4rem;position:relative;text-align:right;padding-right:1.2rem;
}
.tl-time::after{content:"";position:absolute;right:40.5px;top:.75rem;width:11px;height:11px;border-radius:50%;background:#fff;border:3px solid var(--copper);}
.tl-body{grid-column:2;padding:0 0 2.2rem;}
.tl-body h4{font-size:17px;margin-bottom:.25rem;}
.tl-body p{font-size:14.5px;color:var(--muted);}

/* 客户 Logo 墙 */
.logo-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;}
.logo-cell{
  display:flex;align-items:center;justify-content:center;padding:1.4rem 1rem;
  background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);min-height:96px;
}
.logo-cell img{max-height:46px;width:auto;max-width:88%;object-fit:contain;filter:grayscale(1);opacity:.75;transition:.25s;}
.logo-cell:hover img{filter:grayscale(0);opacity:1;}
.logo-note{text-align:center;color:var(--muted);font-size:13px;margin-top:1.2rem;}

/* 表格 */
.table-wrap{border:1px solid var(--line-soft);border-radius:var(--radius);overflow:hidden;background:#fff;}
table.data{width:100%;border-collapse:collapse;table-layout:fixed;font-size:14.5px;}
table.data colgroup col:first-child{background:var(--paper);}
table.data th{
  text-align:left;padding:.9rem 1.1rem;font-family:var(--font-display);font-size:13px;
  letter-spacing:.08em;text-transform:uppercase;color:var(--navy-800);
  border-bottom:2px solid var(--navy-800);background:#fff;
}
table.data td{padding:.85rem 1.1rem;border-bottom:1px solid var(--line-soft);vertical-align:top;color:var(--text);}
table.data td:first-child{font-weight:600;color:var(--navy-900);width:26%;}
table.data tr:last-child td{border-bottom:0;}

/* ============ CTA 区 ============ */
.cta-band{background:var(--navy-800);border-radius:var(--radius);padding:3.2rem 3rem;display:flex;align-items:center;gap:2rem;justify-content:space-between;flex-wrap:wrap;color:#fff;}
.cta-band h2{color:#fff;font-size:clamp(22px,2.6vw,30px);}
.cta-band p{color:rgba(255,255,255,.78);margin-top:.5rem;max-width:36em;font-size:15px;}

/* ============ Footer ============ */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.72);margin-top:0;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.6fr;gap:2.6rem;padding:64px 0 40px;}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:1.1rem;letter-spacing:.04em;}
.site-footer a{color:rgba(255,255,255,.7);font-size:14px;display:block;padding:.28rem 0;}
.site-footer a:hover{color:#fff;}
.footer-brand img{height:34px;}
.footer-brand p{font-size:13.5px;margin-top:1rem;max-width:24em;color:rgba(255,255,255,.6);}
.footer-contact li{font-size:14px;padding:.28rem 0;color:rgba(255,255,255,.7);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding:1.3rem 0;font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;color:rgba(255,255,255,.55);}
.footer-bottom .made-by a{display:inline;padding:0;color:var(--copper-soft);font-size:13px;}
.footer-bottom .made-by a:hover{color:#fff;}

/* ============ 页头 banner（内页） ============ */
.page-hero{position:relative;background:var(--navy-800);color:#fff;overflow:hidden;}
.page-hero .bg{position:absolute;inset:0;object-fit:cover;width:100%;height:100%;opacity:.28;}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(11,34,64,.85),rgba(11,34,64,.45));}
.page-hero .ph-inner{position:relative;z-index:2;padding:74px 0;width:min(var(--container),92%);margin-inline:auto;}
.page-hero h1{font-size:clamp(28px,3.6vw,42px);color:#fff;}
.page-hero .crumb{font-size:13px;color:rgba(255,255,255,.65);letter-spacing:.06em;margin-bottom:.7rem;}
.page-hero p{color:rgba(255,255,255,.82);margin-top:.7rem;max-width:34em;font-size:15.5px;}

/* ============ 联系页表单 ============ */
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:2.4rem;align-items:start;}
.info-list li{display:flex;gap:1rem;padding:.95rem 0;border-bottom:1px solid var(--line-soft);align-items:flex-start;}
.info-list li:last-child{border-bottom:0;}
.info-list .ic{flex:none;width:42px;height:42px;border-radius:var(--radius);background:var(--paper);display:flex;align-items:center;justify-content:center;}
.info-list .ic svg{width:20px;height:20px;stroke:var(--navy-800);}
.info-list .k{font-size:12.5px;letter-spacing:.1em;color:var(--copper);font-weight:600;text-transform:uppercase;}
.info-list .v{font-size:15px;color:var(--navy-900);font-weight:600;margin-top:.15rem;}
.info-list .v .sub{display:block;font-weight:400;font-size:13.5px;color:var(--muted);}

.form-card{background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:2rem;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem;}
.field{margin-bottom:1.1rem;}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--navy-900);margin-bottom:.4rem;}
.field input,.field select,.field textarea{
  width:100%;padding:.72rem .9rem;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-body);font-size:14.5px;color:var(--ink);background:#fff;transition:.18s;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue-500);box-shadow:0 0 0 3px rgba(30,102,206,.14);}
.field textarea{min-height:130px;resize:vertical;}

/* ============ 产品详情 ============ */
.detail-hero{display:grid;grid-template-columns:1.05fr .95fr;gap:2.6rem;align-items:center;}
.detail-hero .dh-media{border:1px solid var(--line-soft);border-radius:var(--radius);overflow:hidden;background:var(--paper);}
.detail-hero .dh-media img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.detail-hero h1{font-size:clamp(28px,3.4vw,40px);}
.detail-hero .en-name{font-family:var(--font-display);color:var(--copper);letter-spacing:.08em;font-size:15px;margin:.2rem 0 .8rem;}
.detail-hero .desc{font-size:15.5px;color:var(--text);margin-top:.8rem;}
.tag-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.2rem;}
.tag{font-size:12.5px;color:var(--navy-800);background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:.25rem .8rem;}

/* ============ 通用工具类 ============ */
.lead-lg{font-size:17px;color:var(--text);}
.muted{color:var(--muted);}
.mt-1{margin-top:1rem;} .mt-2{margin-top:2rem;} .mt-3{margin-top:3rem;}
.ta-c{text-align:center;}
.media-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;}
.media-strip .cell{aspect-ratio:4/3;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line-soft);}
.media-strip .cell img{width:100%;height:100%;object-fit:cover;}

/* Toast */
#toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);
  background:var(--navy-900);color:#fff;padding:.85rem 1.6rem;border-radius:999px;
  font-size:14px;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:.3s;z-index:200;
}
#toast.show{opacity:1;transform:translate(-50%,0);}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .g-4,.stat-band{grid-template-columns:repeat(2,1fr);}
  .qa-band{grid-template-columns:repeat(2,1fr);}
  .media-strip{grid-template-columns:repeat(2,1fr);}
  .prod-grid,.app-grid,.g-3{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:860px){
  .main-nav{
    position:fixed;inset:74px 0 auto 0;background:var(--navy-900);flex-direction:column;align-items:stretch;
    padding:.8rem 1.25rem;border-bottom:1px solid rgba(255,255,255,.14);
    transform:translateY(-120%);opacity:0;transition:.28s;z-index:99;max-height:calc(100vh - 74px);overflow:auto;
  }
  .nav-open .main-nav{transform:translateY(0);opacity:1;}
  .main-nav a{padding:.85rem .6rem;border-bottom:1px solid rgba(255,255,255,.1);color:rgba(255,255,255,.85);}
  .main-nav a:hover{background:rgba(255,255,255,.06);}
  .lang-switch{margin-left:0;margin-top:.6rem;justify-content:flex-start;width:max-content;}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center;}
  .contact-grid,.detail-hero{grid-template-columns:1fr;}
}
@media (max-width:620px){
  .section{padding:60px 0;}
  .prod-grid,.app-grid,.g-3,.g-2,.g-4,.stat-band,.qa-band,.logo-wall,.form-row{grid-template-columns:1fr;}
  .stat{border-left:0;border-top:1px solid rgba(255,255,255,.12);}
  .stat:first-child{border-top:0;}
  .logo-wall{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr;}
  .timeline{grid-template-columns:70px 1fr;}
  .timeline::before{left:35px;}
  .tl-time::after{right:29.5px;}
  .cta-band{padding:2.2rem 1.6rem;}
  .hero{min-height:480px;}
}