/* ============================================================
   FOSLZGD 官网公共样式
   深圳市福思光电科技有限公司
   ============================================================ */

:root{
  --blue:#0A5CFF;
  --blue-dark:#0847CC;
  --blue-light:#EEF3FF;
  --dark:#0B1220;
  --dark-2:#111C33;
  --text:#1F2937;
  --gray:#6B7280;
  --light:#F5F7FA;
  --border:#E5E7EB;
  --radius:12px;
  --shadow:0 12px 30px rgba(0,0,0,.08);
  --container:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;
  color:var(--text);
  background:#fff;
  line-height:1.7;
  font-size:16px;
}

a{text-decoration:none;color:inherit}
img{max-width:100%;display:block;border:0}
button{font-family:inherit}

.container{max-width:var(--container);margin:0 auto;padding:0 20px}

/* ---------- 语言切换 ----------
   默认显示中文(.zh)、隐藏英文(.en)；html 加 .lang-en 后反转。
   不使用 display:inline，避免破坏块级元素布局。 */
html.lang-en .zh{display:none !important}
html:not(.lang-en) .en{display:none !important}

/* ---------- 顶部导航 ---------- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,18,32,.96);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;gap:16px}

.logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:800;color:#fff;letter-spacing:.5px;flex-shrink:0}
.logo-mark{height:34px;width:34px;object-fit:contain;background:#fff;border-radius:8px;padding:3px;flex-shrink:0}
.logo span{color:var(--blue)}

.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:rgba(255,255,255,.8);font-size:15px;position:relative;padding:4px 0}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--blue);border-radius:2px
}

.lang-btn{
  background:var(--blue);color:#fff;border:none;padding:8px 14px;
  border-radius:6px;cursor:pointer;font-size:14px;white-space:nowrap;flex-shrink:0
}
.lang-btn:hover{background:var(--blue-dark)}

.nav-toggle{
  display:none;background:none;border:0;cursor:pointer;padding:8px;
  width:42px;height:42px;flex-direction:column;justify-content:center;gap:5px
}
.nav-toggle span{display:block;height:2px;background:#fff;border-radius:2px;transition:.25s}

/* ---------- 首屏 ---------- */
.hero{
  background:radial-gradient(circle at 20% 20%,rgba(10,92,255,.28),transparent 40%),linear-gradient(135deg,#0B1220 0%,#111C33 100%);
  color:#fff;padding:110px 0 90px;
}
.hero h1{font-size:50px;line-height:1.2;margin-bottom:20px;font-weight:800}
.hero h1 span{color:var(--blue)}
.hero p{font-size:18px;color:rgba(255,255,255,.75);max-width:760px;margin-bottom:30px}
.keywords{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.keywords span{border:1px solid rgba(255,255,255,.2);padding:8px 16px;border-radius:999px;font-size:14px;color:rgba(255,255,255,.85)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px}
.btn{
  display:inline-block;padding:14px 28px;border-radius:8px;font-size:16px;font-weight:600;
  cursor:pointer;border:1px solid transparent;transition:.25s
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* ---------- 页面头 ---------- */
.page-hero{
  background:linear-gradient(135deg,#0B1220,#111C33);color:#fff;
  padding:70px 0 50px;text-align:center
}
.page-hero h1{font-size:40px;margin-bottom:12px;font-weight:800}
.page-hero p{color:rgba(255,255,255,.7);max-width:760px;margin:0 auto}
.breadcrumb{font-size:13px;color:rgba(255,255,255,.5);margin-top:14px}
.breadcrumb a:hover{color:#fff}

/* ---------- 通用区块 ---------- */
.section{padding:80px 0}
.section-light{background:var(--light)}
.section-title{font-size:32px;font-weight:700;margin-bottom:16px;color:var(--dark);line-height:1.3}
.section-sub{color:var(--gray);margin-bottom:40px;max-width:760px}
.section-head{text-align:center}
.section-head .section-sub{margin-left:auto;margin-right:auto}

.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 卡片 ---------- */
.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;transition:.3s
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue)}
.card h3{font-size:18px;margin-bottom:10px;color:var(--dark)}
.card p{color:var(--gray);font-size:14px}

.card-icon{
  width:56px;height:56px;margin-bottom:16px;border-radius:12px;
  background:linear-gradient(135deg,var(--blue),#6EA8FF);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:700
}
.tag{display:inline-block;background:var(--blue-light);color:var(--blue);padding:4px 12px;border-radius:999px;font-size:13px;margin:6px 6px 0 0}

/* ---------- 产品卡片 ---------- */
.product-toolbar{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:36px}
.product-toolbar button{
  border:1px solid var(--border);background:#fff;padding:10px 20px;border-radius:999px;
  cursor:pointer;font-size:14px;color:#374151;transition:.2s
}
.product-toolbar button:hover,.product-toolbar button.active{background:var(--blue);color:#fff;border-color:var(--blue)}

.product-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;transition:.3s;display:flex;flex-direction:column
}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue)}
.product-card .thumb{
  aspect-ratio:4/3;background:#F8FAFF;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;overflow:hidden
}
.product-card .thumb img{width:100%;height:100%;object-fit:contain;padding:12px}
.product-card .body{padding:20px;flex:1;display:flex;flex-direction:column}
.product-card h3{font-size:17px;margin-bottom:8px;color:var(--dark)}
.product-card .body p{color:var(--gray);font-size:14px;flex:1}
.product-card .more{margin-top:14px;color:var(--blue);font-size:14px;font-weight:600}
.product-card .more:hover{text-decoration:underline}
.cat-label{
  display:inline-block;font-size:12px;color:var(--blue);background:var(--blue-light);
  padding:3px 10px;border-radius:999px;margin-bottom:10px;align-self:flex-start
}

/* ---------- 产品详情 ---------- */
.detail-wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.detail-media{background:#F8FAFF;border:1px solid var(--border);border-radius:var(--radius);padding:20px;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center}
.detail-media img{max-height:100%;object-fit:contain}
.detail-info h1{font-size:30px;margin-bottom:8px;color:var(--dark)}
.detail-info .en-name{color:var(--gray);font-size:16px;margin-bottom:18px}
.detail-info .desc{color:#374151;margin-bottom:22px}
.detail-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.spec-table{width:100%;border-collapse:collapse;margin-top:16px}
.spec-table th,.spec-table td{border:1px solid var(--border);padding:12px 14px;text-align:left;font-size:14px;vertical-align:top}
.spec-table th{background:var(--light);color:var(--dark);font-weight:600}
.spec-table td:first-child{width:38%;color:var(--gray)}
.notice{
  background:var(--blue-light);border-left:3px solid var(--blue);padding:16px 20px;
  border-radius:8px;color:#374151;font-size:14px;margin-top:24px
}

/* ---------- 表格 ---------- */
.table{width:100%;border-collapse:collapse;margin-top:20px;background:#fff}
.table th,.table td{border:1px solid var(--border);padding:12px 14px;text-align:left;font-size:14px}
.table th{background:var(--light);color:var(--dark)}
.table-wrap{overflow-x:auto}

/* ---------- 图像画廊 ---------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gallery figure{
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff;margin:0
}
.gallery img{aspect-ratio:4/3;object-fit:cover;width:100%}
.gallery figcaption{padding:10px 14px;font-size:13px;color:var(--gray)}

/* ---------- 数据条 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat strong{display:block;font-size:34px;color:var(--blue);font-weight:800;line-height:1.2}
.stat span{color:var(--gray);font-size:14px}

/* ---------- CTA / 表单 ---------- */
.cta{background:var(--dark);color:#fff;padding:80px 0}
.cta h2{font-size:32px;margin-bottom:16px}
.cta p{color:rgba(255,255,255,.7);margin-bottom:32px;max-width:700px}

.inquiry-form{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:820px}
.inquiry-form input,.inquiry-form textarea{
  width:100%;padding:14px;border-radius:8px;font-size:15px;outline:none;font-family:inherit;
  border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.06);color:#fff
}
.inquiry-form input::placeholder,.inquiry-form textarea::placeholder{color:rgba(255,255,255,.45)}
.inquiry-form input:focus,.inquiry-form textarea:focus{border-color:var(--blue)}
.inquiry-form textarea{grid-column:1/-1;min-height:130px;resize:vertical}
.inquiry-form button{grid-column:1/-1;background:var(--blue);color:#fff;border:none;padding:16px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer}
.inquiry-form button:hover{background:var(--blue-dark)}
.form-note{grid-column:1/-1;font-size:13px;color:rgba(255,255,255,.5)}

.form-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.form-card h3{color:var(--dark);margin-bottom:20px;font-size:22px}
.form-card input,.form-card textarea{
  width:100%;padding:14px;border:1px solid var(--border);border-radius:8px;margin-bottom:16px;
  font-size:15px;outline:none;font-family:inherit
}
.form-card input:focus,.form-card textarea:focus{border-color:var(--blue)}
.form-card textarea{min-height:140px;resize:vertical}
.form-card button{width:100%;background:var(--blue);color:#fff;border:none;padding:16px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer}
.form-card button:hover{background:var(--blue-dark)}

.alert{padding:14px 18px;border-radius:8px;font-size:15px;margin-bottom:20px}
.alert-success{background:#ECFDF5;color:#065F46;border:1px solid #A7F3D0}
.alert-error{background:#FEF2F2;color:#991B1B;border:1px solid #FECACA}

/* ---------- 联系信息 ---------- */
.info-card{background:var(--light);border-radius:var(--radius);padding:28px}
.info-card h3{color:var(--dark);margin-bottom:18px;font-size:20px}
.info-item{margin-bottom:16px;font-size:15px}
.info-item strong{display:block;color:var(--gray);font-size:13px;margin-bottom:4px;font-weight:600}

/* ---------- 页脚 ---------- */
.footer{background:#070C14;color:rgba(255,255,255,.6);padding:48px 0 28px;font-size:14px;margin-top:0}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer .logo{margin-bottom:14px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:600}
.footer a:hover{color:#fff}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer-bottom{padding-top:20px;font-size:13px;color:rgba(255,255,255,.45);line-height:1.9}

/* ---------- 浮动咨询 ---------- */
.float-btn{
  position:fixed;right:24px;bottom:24px;z-index:200;background:#07C160;color:#fff;
  padding:12px 18px;border-radius:999px;box-shadow:0 8px 24px rgba(0,0,0,.2);
  font-size:14px;cursor:pointer;border:none;display:flex;align-items:center;gap:6px
}
.float-btn:hover{background:#06AD56}

/* ---------- 图文两栏 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}

/* ---------- 产品分组 ---------- */
.product-group{margin-bottom:56px}
.product-group:last-child{margin-bottom:0}
.group-title{
  display:flex;align-items:center;gap:12px;font-size:22px;color:var(--dark);
  font-weight:700;margin-bottom:22px;padding-bottom:12px;border-bottom:2px solid var(--border)
}
.group-icon{
  width:36px;height:36px;flex-shrink:0;border-radius:8px;
  background:linear-gradient(135deg,var(--blue),#6EA8FF);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700
}
.group-count{
  margin-left:auto;font-size:13px;font-weight:600;color:var(--blue);
  background:var(--blue-light);border-radius:999px;padding:2px 12px
}

/* ---------- 无图占位 ---------- */
.thumb-ph{
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#EEF3FF,#F8FAFF);color:var(--blue);
  font-size:14px;font-weight:700;text-align:center;padding:14px;letter-spacing:.3px
}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .grid-4{grid-template-columns:repeat(3,1fr)}
  .gallery{grid-template-columns:repeat(3,1fr)}
}

@media(max-width:900px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .detail-wrap{grid-template-columns:1fr;gap:28px}
  .hero{padding:70px 0 60px}
  .hero h1{font-size:34px}
  .page-hero h1{font-size:30px}
  .section{padding:56px 0}
  .section-title{font-size:26px}

  /* 移动端导航 */
  .nav-toggle{display:flex}
  .nav-links{
    position:absolute;top:72px;left:0;right:0;
    flex-direction:column;gap:0;align-items:stretch;
    background:#0B1220;border-bottom:1px solid rgba(255,255,255,.1);
    box-shadow:0 16px 30px rgba(0,0,0,.35);
    padding:8px 20px 16px;display:none
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.06);font-size:16px}
  .nav-links a.active::after{display:none}
  .footer-top{grid-template-columns:1fr;gap:24px}
}

@media(max-width:600px){
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .inquiry-form{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .hero p{font-size:16px}
  .card{padding:22px}
  .float-btn{right:16px;bottom:16px;padding:10px 14px}
}