/* ============================================================
   深圳鼎盛光联科技 · 全站公共样式
   深蓝科技风 · 中英双语 · 响应式
   ============================================================ */

:root{
  --navy:#0a1f3c;
  --navy2:#0d2b52;
  --navy3:#123a6b;
  --blue:#1a6dff;
  --cyan:#3aa7ff;
  --gold:#c9a86a;
  --gold-dark:#b8860b;
  --bg:#f5f7fb;
  --bg2:#ffffff;
  --text:#1a2a44;
  --muted:#5a6b85;
  --line:#e7edf5;
  --white:#ffffff;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit;transition:color .2s;}
img{max-width:100%;display:block;}
ul,ol{list-style:none;}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px;}
.wrap-narrow{max-width:960px;margin:0 auto;padding:0 24px;}

/* ===== 顶部信息条 ===== */
.topbar{background:var(--navy);color:#c9d6e8;font-size:13px;padding:8px 0;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;}
.topbar .co-name{letter-spacing:.5px;}
.topbar .lang{display:flex;gap:6px;flex-shrink:0;}
.topbar .lang a{color:#a9bdd8;padding:3px 10px;border-radius:14px;font-size:13px;}
.topbar .lang a.active{color:var(--gold);background:rgba(255,255,255,.08);}
.topbar .lang a:hover{color:#fff;}

/* ===== 导航栏 ===== */
header{background:var(--white);box-shadow:0 2px 12px rgba(10,31,60,.06);position:sticky;top:0;z-index:100;}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
.logo{display:flex;align-items:center;gap:12px;}
.logo .logo-img{height:52px;width:auto;display:block;object-fit:contain;}
.logo .mark{
  width:44px;height:44px;border-radius:11px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:21px;
  box-shadow:0 4px 14px rgba(26,109,255,.3);
}
.logo .name{font-size:19px;font-weight:700;color:var(--navy);line-height:1.2;}
.logo .name small{display:block;font-size:10.5px;font-weight:400;color:var(--muted);letter-spacing:1.5px;}
.menu{display:flex;gap:30px;font-size:15px;}
.menu a{position:relative;padding:6px 0;color:var(--text);font-weight:500;}
.menu a:hover,.menu a.active{color:var(--blue);}
.menu a.active::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:2px;
  background:var(--blue);border-radius:2px;
}
.cta-btn{
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  padding:11px 24px;border-radius:26px;font-size:14px;font-weight:600;
  box-shadow:0 6px 18px rgba(26,109,255,.3);transition:.25s;white-space:nowrap;
}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(26,109,255,.4);}

/* 移动端菜单按钮 */
.menu-toggle{display:none;background:none;border:none;font-size:26px;color:var(--navy);cursor:pointer;}

/* ===== Hero 首屏 ===== */
.hero{
  background:radial-gradient(1200px 600px at 80% -10%,#1a4b8f 0%,var(--navy) 55%,#07152b 100%);
  color:#fff;position:relative;overflow:hidden;padding:110px 0 90px;
}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(58,167,255,.35),transparent 70%);}
.hero::before{content:"";position:absolute;left:-80px;bottom:-160px;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(26,109,255,.28),transparent 70%);}
.hero .wrap{position:relative;z-index:2;}
.hero .badge{
  display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);
  padding:6px 16px;border-radius:20px;font-size:13px;letter-spacing:2px;color:#cfe0ff;margin-bottom:24px;
}
.hero h1{font-size:50px;line-height:1.28;font-weight:800;margin-bottom:20px;max-width:760px;}
.hero h1 .grad{
  background:linear-gradient(90deg,#7fc0ff,#c9a86a);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .sub{font-size:17px;color:#b9cbe4;max-width:620px;margin-bottom:14px;}
.hero .sub b{color:#7fc0ff;font-weight:600;}
.hero .en{font-size:15px;color:#8fa6c4;letter-spacing:.5px;margin-bottom:36px;}
.hero .btns{display:flex;gap:16px;flex-wrap:wrap;}
.btn-white{
  background:#fff;color:var(--navy);padding:13px 30px;border-radius:28px;
  font-weight:700;font-size:15px;box-shadow:0 8px 22px rgba(0,0,0,.2);transition:.25s;
}
.btn-white:hover{transform:translateY(-2px);}
.btn-ghost{
  background:transparent;border:1px solid rgba(255,255,255,.4);color:#fff;
  padding:13px 28px;border-radius:28px;font-weight:600;font-size:15px;transition:.25s;
}
.btn-ghost:hover{background:rgba(255,255,255,.08);}

/* ===== 高速速率标签条 ===== */
.speed-strip{background:var(--navy2);color:#fff;padding:30px 0;border-top:1px solid rgba(255,255,255,.08);}
.speed-strip .wrap{display:flex;justify-content:center;gap:48px;flex-wrap:wrap;}
.speed{text-align:center;}
.speed .v{
  font-size:30px;font-weight:800;
  background:linear-gradient(90deg,#7fc0ff,#c9a86a);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.speed .l{font-size:12px;color:#8fa6c4;letter-spacing:1px;margin-top:2px;}

/* ===== 统计条 ===== */
.stats{background:var(--navy2);color:#fff;padding:46px 0;}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.stat .num{
  font-size:40px;font-weight:800;
  background:linear-gradient(90deg,#7fc0ff,#c9a86a);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat .label{font-size:14px;color:#a9bdd8;margin-top:4px;}

/* ===== 通用 section ===== */
section{padding:80px 0;}
section.alt{background:#fff;}
.sec-head{text-align:center;margin-bottom:52px;}
.sec-head .en{
  font-size:13px;letter-spacing:4px;color:var(--blue);
  text-transform:uppercase;font-weight:600;margin-bottom:8px;
}
.sec-head h2{font-size:36px;font-weight:800;color:var(--navy);}
.sec-head p{color:var(--muted);margin-top:12px;max-width:640px;margin-left:auto;margin-right:auto;}

/* ===== 优势四宫格 ===== */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.adv{
  background:#fff;border-radius:16px;padding:36px 28px;
  box-shadow:0 6px 24px rgba(10,31,60,.05);transition:.3s;
}
.adv:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(10,31,60,.1);}
.adv .icon{
  width:56px;height:56px;border-radius:14px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:20px;
}
.adv h3{font-size:19px;color:var(--navy);margin-bottom:10px;}
.adv p{font-size:14px;color:var(--muted);}

/* ===== 产品 Tab ===== */
.products{background:#fff;}
.tabs{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:40px;}
.tab{
  padding:10px 22px;border-radius:24px;border:1px solid #dbe4f0;color:var(--muted);
  font-size:14px;font-weight:600;cursor:pointer;transition:.2s;
}
.tab:hover{border-color:var(--blue);color:var(--blue);}
.tab.active{
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  border-color:transparent;box-shadow:0 6px 16px rgba(26,109,255,.28);
}
.tab .hot{
  display:inline-block;background:var(--gold);color:#fff;font-size:10px;
  padding:1px 7px;border-radius:8px;margin-left:6px;vertical-align:1px;font-style:normal;
}
.tab.active .hot{background:rgba(255,255,255,.3);}

/* ===== 产品卡片 ===== */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.prod{border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.3s;background:#fff;display:flex;flex-direction:column;}
.prod .img.prod-img{flex-shrink:0;}
.prod:hover{box-shadow:0 16px 40px rgba(10,31,60,.15);transform:translateY(-4px);border-color:var(--blue);}
.prod .img{
  height:180px;background:linear-gradient(135deg,#eef4ff,#dfe9fb);
  display:flex;align-items:center;justify-content:center;font-size:64px;
}
.prod .img.prod-img{
  height:220px;background:#fff;padding:0;box-sizing:border-box;
}
.prod .img.prod-img img{
  width:92%;height:92%;object-fit:contain;display:block;transform:rotate(-2deg);
}
.prod .img.hot{background:#fff;}
.prod .body{padding:24px;background:var(--navy2);border-radius:0 0 15px 15px;display:flex;flex-direction:column;flex:1;}
.prod .tag{
  display:inline-block;font-size:12px;background:rgba(255,255,255,.14);color:#cfe0ff;
  padding:3px 12px;border-radius:14px;font-weight:600;margin-bottom:12px;
}
.prod .tag.gold{background:rgba(201,168,106,.25);color:var(--gold);}
.prod .body h3{font-size:20px;color:#fff;margin-bottom:8px;}
.prod .body p{font-size:14px;color:#a9bdd8;margin-bottom:16px;}
.prod .link{color:var(--gold);font-weight:600;font-size:14px;margin-top:auto;}
.prod .link:hover{text-decoration:underline;color:#fff;}

/* ===== 应用领域 ===== */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.app{background:var(--navy);color:#fff;border-radius:14px;padding:32px 24px;text-align:center;transition:.3s;}
.app:hover{background:var(--navy3);transform:translateY(-4px);}
.app .icon{font-size:36px;margin-bottom:14px;}
.app h4{font-size:17px;margin-bottom:6px;}
.app p{font-size:13px;color:#9fb4d0;}

/* ===== 关于我们摘要 ===== */
.about{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;}
.about .imgbox{
  background:linear-gradient(135deg,var(--navy),var(--blue));border-radius:20px;height:340px;
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;letter-spacing:2px;
}
.about h2{font-size:34px;color:var(--navy);margin-bottom:20px;}
.about .hl{color:var(--blue);}
.about p{color:var(--muted);margin-bottom:16px;font-size:15px;}
.about .list{margin-top:10px;}
.about .list li{padding:8px 0;color:var(--text);font-size:15px;}
.about .list li::before{content:"✓";color:var(--blue);font-weight:700;margin-right:10px;}

/* ===== CTA 横幅 ===== */
.cta-band{background:linear-gradient(120deg,var(--blue),var(--cyan));color:#fff;text-align:center;padding:70px 0;}
.cta-band h2{font-size:34px;font-weight:800;margin-bottom:14px;}
.cta-band p{font-size:16px;opacity:.92;margin-bottom:30px;}
.cta-band .btn-white{display:inline-block;}

/* ===== 内页顶部横幅 ===== */
.page-hero{
  background:radial-gradient(1000px 500px at 75% -10%,#1a4b8f 0%,var(--navy) 55%,#07152b 100%);
  color:#fff;padding:70px 0;text-align:center;position:relative;overflow:hidden;
}
.page-hero h1{font-size:38px;font-weight:800;margin-bottom:12px;}
.page-hero p{color:#b9cbe4;font-size:16px;}
.page-hero .crumb{margin-top:16px;font-size:13px;color:#8fa6c4;}
.page-hero .crumb a{color:#cfe0ff;}
.page-hero .crumb a:hover{color:#fff;}

/* ===== 页脚 ===== */
footer{background:var(--navy);color:#a9bdd8;padding:60px 0 30px;font-size:14px;}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;}
.foot h4{color:#fff;font-size:16px;margin-bottom:16px;}
.foot a{display:block;color:#a9bdd8;padding:4px 0;}
.foot a:hover{color:#fff;}
.foot .contact p{color:#a9bdd8;padding:4px 0;}
.foot .contact .wx{color:var(--gold);font-size:18px;font-weight:700;}
.copyright{border-top:1px solid rgba(255,255,255,.1);padding-top:24px;text-align:center;color:#6b80a0;font-size:13px;}

/* ===== 内页通用内容块 ===== */
.content-block{padding:60px 0;}
.content-block h2{font-size:28px;color:var(--navy);margin-bottom:20px;}
.content-block h3{font-size:20px;color:var(--navy);margin:28px 0 12px;}
.content-block p{color:var(--muted);margin-bottom:16px;font-size:15px;}
.content-block ul{margin:12px 0 20px;padding-left:0;}
.content-block ul li{padding:6px 0;color:var(--text);position:relative;padding-left:22px;}
.content-block ul li::before{content:"•";color:var(--blue);font-weight:700;position:absolute;left:0;}

/* ===== 联系页 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start;}
.contact-info .item{display:flex;gap:16px;align-items:flex-start;padding:18px 0;border-bottom:1px solid var(--line);}
.contact-info .item .ico{font-size:26px;width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--blue),var(--cyan));display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.contact-info .item h4{color:var(--navy);font-size:16px;margin-bottom:4px;}
.contact-info .item p{color:var(--muted);font-size:15px;}
.contact-info .item p.big{font-size:18px;font-weight:700;color:var(--navy);}

/* 表单 */
.form-card{background:#fff;border-radius:18px;padding:36px;box-shadow:0 8px 30px rgba(10,31,60,.08);}
.form-card h3{font-size:22px;color:var(--navy);margin-bottom:24px;}
.form-group{margin-bottom:18px;}
.form-group label{display:block;font-size:14px;color:var(--text);font-weight:600;margin-bottom:6px;}
.form-group label .req{color:#e5484d;}
.form-group input,.form-group textarea,.form-group select{
  width:100%;padding:12px 14px;border:1px solid #dbe4f0;border-radius:10px;
  font-size:14px;font-family:inherit;color:var(--text);background:#fafbfd;transition:.2s;
}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{
  outline:none;border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(26,109,255,.1);
}
.form-group textarea{resize:vertical;min-height:110px;}
.submit-btn{
  width:100%;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  border:none;padding:14px;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;
  box-shadow:0 6px 18px rgba(26,109,255,.3);transition:.25s;
}
.submit-btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(26,109,255,.4);}
.form-tip{margin-top:12px;font-size:13px;color:var(--muted);text-align:center;}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .hero h1{font-size:34px;}
  .adv-grid,.app-grid{grid-template-columns:1fr 1fr;}
  .prod-grid{grid-template-columns:1fr;}
  .stats .wrap{grid-template-columns:1fr 1fr;}
  .about{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .menu{
    display:none;position:absolute;top:72px;left:0;right:0;background:#fff;
    flex-direction:column;gap:0;padding:10px 24px;box-shadow:0 12px 30px rgba(10,31,60,.12);
  }
  .menu.open{display:flex;}
  .menu a{padding:14px 0;border-bottom:1px solid var(--line);}
  .menu-toggle{display:block;}
  .speed-strip .wrap{gap:24px;}
}