:root{
  --blue:#004ea8;
  --blue2:#0066d6;
  --dark:#111;
  --gray:#f5f7fa;
  --text:#222;
  --light-blue:#e8f1fc;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif;
  color:var(--text);
  line-height:1.7;
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
.container{width:1180px;max-width:92%;margin:auto}

/* ============ 顶部 ============ */
.header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.06);position:sticky;top:0;z-index:99}
.nav-top{background:var(--blue);color:#fff;font-size:13px;padding:6px 0}
.nav-top .container{display:flex;justify-content:space-between}
.nav-top a{color:#cfe2fb;margin-left:16px}
.nav-top a:hover{color:#fff}
.nav-main{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo strong{color:var(--blue);font-size:26px;letter-spacing:2px;font-weight:800}
.logo span{display:block;margin-top:-4px;color:#888;font-size:12px;letter-spacing:1px}
.nav-links a{
  margin-left:26px;font-size:15px;font-weight:500;position:relative;padding:6px 0;
}
.nav-links a:hover,
.nav-links a.active{color:var(--blue)}
.nav-links a.active::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--blue);
}

/* ============ 首屏 ============ */
.hero{
  position:relative;height:560px;display:flex;align-items:center;
  background:url(../images/hero.jpg) center/cover no-repeat;
  color:#fff;
}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,30,70,.82),rgba(0,60,130,.45))}
.hero .container{position:relative;z-index:1}
.hero h1{font-size:44px;margin-bottom:16px;line-height:1.25;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.hero p{font-size:18px;opacity:.95;margin-bottom:30px}
.btn-group{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;background:#fff;color:var(--blue);padding:12px 28px;border-radius:6px;font-weight:700;transition:.2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.25)}
.btn-line{background:transparent;border:2px solid #fff;color:#fff}
.btn-line:hover{background:#fff;color:var(--blue)}

/* ============ 通用区块 ============ */
.section{padding:76px 0}
.gray{background:var(--gray)}
.blue-bg{background:linear-gradient(120deg,var(--blue),var(--blue2));color:#fff}
.sec-title{font-size:30px;margin-bottom:8px;color:var(--blue);text-align:center}
.blue-bg .sec-title{color:#fff}
.sec-sub{text-align:center;color:#888;margin-bottom:42px;font-size:15px}
.blue-bg .sec-sub{color:rgba(255,255,255,.85)}

/* ============ 产品卡片 ============ */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:34px}
.card{
  background:#fff;border:1px solid #eee;border-radius:12px;padding:22px;
  transition:.25s;box-shadow:0 2px 10px rgba(0,0,0,.03)
}
.card:hover{transform:translateY(-5px);box-shadow:0 12px 28px rgba(0,78,168,.12);border-color:#cfe0f5}
.ico{font-size:34px;margin-bottom:10px}
.card h3{margin-bottom:8px;color:var(--blue);font-size:18px}
.card p{color:#666;font-size:14px}
.card .more{display:inline-block;margin-top:12px;color:var(--blue);font-weight:600;font-size:14px}
.card .more:hover{text-decoration:underline}

/* 产品卡片带图 */
.prod-img{width:100%;height:180px;object-fit:cover;border-radius:8px;margin-bottom:14px}
.prod-card h3{margin-top:0}

/* ============ 列表 & 表格 ============ */
.list{padding-left:0;list-style:none}
.list li{padding:7px 0 7px 22px;position:relative;font-size:15px}
.list li::before{content:"▸";position:absolute;left:0;color:var(--blue);font-weight:700}
table{width:100%;border-collapse:collapse;font-size:15px}
table th{background:var(--blue);color:#fff;padding:12px;text-align:left}
table td{padding:12px;border-bottom:1px solid #eee}
table tr:nth-child(even) td{background:#f8fbff}

/* ============ 新闻 ============ */
.news-card small{color:var(--blue);font-weight:600;letter-spacing:.5px}
.news-card h3{margin:8px 0;font-size:17px;line-height:1.4}
.news-card p{font-size:14px}

/* ============ 联系 ============ */
.contact-box{background:#fff;border:1px solid #eee;border-radius:12px;padding:26px;box-shadow:0 2px 10px rgba(0,0,0,.03)}
.contact-box p{margin:10px 0;font-size:15px}
.contact-box a{display:block;margin:8px 0;color:#555}
.contact-box a:hover{color:var(--blue)}
.warn{
  margin-top:16px;padding:14px 16px;background:#fff8e6;border:1px solid #f5d98a;
  border-radius:8px;color:#8a6d1a;font-size:14px
}

/* ============ 页脚 ============ */
.footer{background:var(--dark);color:#ccc;padding:46px 0 0}
.footer .container{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.footer h4{color:#fff;margin-bottom:14px;font-size:16px}
.footer p,.footer a{font-size:14px;line-height:2}
.footer a:hover{color:#fff}
.copyright{margin-top:34px;padding:18px 0;border-top:1px solid #333;text-align:center;font-size:13px;color:#777}

/* ============ 悬浮按钮 ============ */
.float-bar{position:fixed;right:20px;bottom:26px;display:flex;flex-direction:column;gap:12px;z-index:999}
.float-phone,.float-wechat{
  display:flex;align-items:center;gap:8px;
  background:var(--blue);color:#fff;border:none;
  padding:13px 20px;border-radius:40px;font-size:15px;font-weight:600;cursor:pointer;
  box-shadow:0 6px 18px rgba(0,0,0,.28);transition:.2s
}
.float-phone:hover{transform:scale(1.05);background:#003d85}
.float-wechat{background:#07c160}
.float-wechat:hover{transform:scale(1.05);background:#05a352}
.float-bar .small{font-size:15px}
@media(max-width:420px){.float-bar .small{display:none}.float-phone,.float-wechat{padding:13px}}

/* 微信弹层 */
.wechat-pop{
  position:fixed;inset:0;background:rgba(0,0,0,.5);
  display:none;align-items:center;justify-content:center;z-index:9999
}
.wechat-box{background:#fff;width:280px;padding:22px;text-align:center;border-radius:14px;position:relative}
.wechat-box img{width:190px;height:190px;object-fit:cover;margin:12px auto;border:1px solid #eee}
.close{position:absolute;right:12px;top:8px;font-size:26px;cursor:pointer;color:#999;line-height:1}
.tip{color:#888;font-size:13px;margin-top:4px}

/* ============ 响应式 ============ */
@media(max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .nav-links a{margin-left:14px;font-size:14px}
  .hero{height:440px}
  .hero h1{font-size:32px}
}
@media(max-width:560px){
  .grid-4{grid-template-columns:1fr}
  .hero{height:380px}
  .hero h1{font-size:26px}
  .hero p{font-size:15px}
  .nav-top{font-size:12px}
  .footer .container{grid-template-columns:1fr}
  .section{padding:54px 0}
}