/* ============================================================
   极热能源科技 · 赛博科技风样式
   ============================================================ */
:root{
  --bg:#070b18;
  --bg2:#0b1226;
  --panel:rgba(18,28,54,.72);
  --panel-solid:#0e1730;
  --cyan:#00e5ff;
  --cyan-soft:#5ef2ff;
  --magenta:#ff2bd6;
  --gold:#ffd54f;
  --violet:#7c4dff;
  --text:#dfe9ff;
  --text-dim:#8aa0c8;
  --line:rgba(0,229,255,.18);
  --glow:0 0 18px rgba(0,229,255,.45);
  --radius:14px;
  --maxw:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* 背景网格 + 光晕 */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(900px 500px at 12% -5%,rgba(0,229,255,.16),transparent 60%),
    radial-gradient(800px 500px at 95% 8%,rgba(255,43,214,.14),transparent 60%),
    linear-gradient(180deg,#070b18,#0a1024 40%,#070b18);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;opacity:.35;
  background-image:
    linear-gradient(rgba(0,229,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,229,255,.06) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent);
}

/* 顶部导航 */
header.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(12px);
  background:rgba(7,11,24,.72);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:1px}
.logo img{height:38px;width:38px;border-radius:9px;object-fit:cover;box-shadow:var(--glow)}
.logo .name{font-size:19px;background:linear-gradient(90deg,var(--cyan),var(--magenta));-webkit-background-clip:text;background-clip:text;color:transparent}
.logo .sub{font-size:11px;color:var(--text-dim);letter-spacing:3px}
nav.menu{display:flex;gap:26px}
nav.menu a{position:relative;font-size:15px;color:var(--text-dim);transition:.25s}
nav.menu a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:linear-gradient(90deg,var(--cyan),var(--magenta));transition:.25s}
nav.menu a:hover,nav.menu a.active{color:var(--text)}
nav.menu a:hover::after,nav.menu a.active::after{width:100%}
.nav-cta{display:flex;align-items:center;gap:14px}
.btn{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  padding:10px 20px;border-radius:30px;font-size:14px;font-weight:600;
  border:1px solid var(--cyan);color:var(--cyan);
  background:rgba(0,229,255,.08);transition:.25s;
}
.btn:hover{box-shadow:var(--glow);background:rgba(0,229,255,.18)}
.btn.solid{background:linear-gradient(90deg,var(--cyan),var(--violet));color:#04101f;border:none}
.btn.solid:hover{box-shadow:0 0 22px rgba(124,77,255,.6)}
.menu-toggle{display:none;font-size:26px;color:var(--cyan);cursor:pointer}

/* 英雄区 */
.hero{position:relative;padding:90px 0 60px;text-align:center}
.hero canvas#particles{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.hero .wrap{position:relative;z-index:1}
.hero h1{font-size:46px;line-height:1.25;font-weight:800;letter-spacing:1px}
.hero h1 .hl{background:linear-gradient(90deg,var(--cyan),var(--magenta));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{margin:20px auto 30px;max-width:760px;color:var(--text-dim);font-size:17px}
.hero .stats{display:flex;flex-wrap:wrap;justify-content:center;gap:34px;margin-top:38px}
.stat{text-align:center}
.stat b{display:block;font-size:34px;font-weight:800;color:var(--cyan);text-shadow:var(--glow)}
.stat span{font-size:13px;color:var(--text-dim);letter-spacing:2px}

/* 区块通用 */
section.block{padding:78px 0;position:relative}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head .tag{display:inline-block;font-size:12px;letter-spacing:4px;color:var(--cyan);border:1px solid var(--line);padding:5px 14px;border-radius:20px;margin-bottom:14px}
.sec-head h2{font-size:32px;font-weight:800}
.sec-head h2 .hl{background:linear-gradient(90deg,var(--cyan),var(--magenta));-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head p{color:var(--text-dim);margin-top:10px}

/* 卡片 */
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;backdrop-filter:blur(8px);transition:.3s;position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-6px);border-color:rgba(0,229,255,.5);box-shadow:0 14px 40px rgba(0,229,255,.12)}
.card .ic{font-size:30px;margin-bottom:12px}
.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)}

/* 了解极热 */
.about-hq{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.about-hq .pic{border-radius:var(--radius);border:1px solid var(--line);min-height:300px;background:linear-gradient(135deg,rgba(0,229,255,.12),rgba(255,43,214,.12));display:flex;align-items:center;justify-content:center;font-size:60px}
.kv{display:flex;gap:14px;margin:12px 0;align-items:flex-start}
.kv .k{flex:0 0 96px;color:var(--cyan);font-weight:700}
.kv .v{color:var(--text-dim)}
.mission-box{margin-top:18px;padding:18px 22px;border-left:3px solid var(--cyan);background:rgba(0,229,255,.06);border-radius:0 10px 10px 0;font-style:italic;color:var(--text)}
.patent-list{display:flex;flex-wrap:wrap;gap:14px;margin-top:16px}
.patent{border:1px solid var(--line);border-radius:10px;padding:10px;background:rgba(124,77,255,.08);width:168px;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;transition:.25s}
.patent:hover{transform:translateY(-4px);border-color:var(--gold);box-shadow:0 10px 26px rgba(0,0,0,.35)}
.patent img{width:100%;height:158px;object-fit:contain;border-radius:8px;background:#fff;padding:2px}
.patent b{color:var(--gold);font-size:13px;line-height:1.35}
.patent .pno{color:var(--text-dim);font-size:12px;line-height:1.3;word-break:break-all}

/* 产品 */
.prod-img{height:170px;border-radius:10px;background:linear-gradient(135deg,#0d1b3a,#102347);display:flex;align-items:center;justify-content:center;font-size:54px;border:1px solid var(--line);overflow:hidden}
.prod-img img{width:100%;height:100%;object-fit:cover}
.prod h3{font-size:19px;margin:14px 0 6px}
.prod p{color:var(--text-dim);font-size:14px}

/* 地图 */
.map-wrap{display:grid;grid-template-columns:1fr 320px;gap:24px}
#chinamap{width:100%;height:560px;background:linear-gradient(180deg,rgba(8,14,30,.6),rgba(8,14,30,.2));border:1px solid var(--line);border-radius:var(--radius)}
.map-side{display:flex;flex-direction:column;gap:16px}
.map-toolbar{display:flex;gap:10px;flex-wrap:wrap}
.map-toolbar .btn{padding:8px 16px;font-size:13px}
.map-detail{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;flex:1}
.map-detail h4{color:var(--cyan);margin-bottom:8px}
.map-detail .empty{color:var(--text-dim);font-size:14px}
.legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:14px;font-size:13px;color:var(--text-dim)}
.legend i{display:inline-block;width:12px;height:12px;border-radius:50%;margin-right:6px;vertical-align:middle}

/* 案例 */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel);transition:.3s}
.case:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(255,43,214,.12)}
.case .pic{height:180px;background:linear-gradient(135deg,#101d3d,#0c1530);display:flex;align-items:center;justify-content:center;font-size:50px;overflow:hidden}
.case .pic img{width:100%;height:100%;object-fit:cover}
.case .body{padding:18px}
.case h3{font-size:17px;margin-bottom:6px}
.case p{color:var(--text-dim);font-size:14px}
.case .more{display:inline-block;margin-top:10px;color:var(--cyan);font-size:13px}

/* 政策 */
.policy-list{display:flex;flex-direction:column;gap:18px}
.policy{display:grid;grid-template-columns:200px 1fr;gap:20px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;transition:.3s}
.policy:hover{border-color:rgba(0,229,255,.5);transform:translateX(4px)}
.policy .pic{height:120px;border-radius:10px;background:linear-gradient(135deg,#102347,#0c1530);display:flex;align-items:center;justify-content:center;font-size:40px;overflow:hidden}
.policy .pic img{width:100%;height:100%;object-fit:cover}
.policy h3{font-size:18px}
.policy .sum{color:var(--text-dim);font-size:14px;margin:8px 0}
.policy .src{font-size:12px;color:var(--violet)}
.policy .go{margin-top:10px;color:var(--cyan);font-size:13px}

/* 详情页 */
.detail{max-width:880px;margin:0 auto}
.detail .cover{height:300px;border-radius:var(--radius);background:linear-gradient(135deg,#102347,#0c1530);display:flex;align-items:center;justify-content:center;font-size:60px;overflow:hidden;border:1px solid var(--line);margin-bottom:24px}
.detail .cover img{width:100%;height:100%;object-fit:cover}
.detail h1{font-size:30px;margin-bottom:10px}
.detail .meta{color:var(--text-dim);font-size:13px;margin-bottom:20px}
.detail .content{font-size:16px;color:var(--text);line-height:1.9}
.detail .content p{margin-bottom:16px}
.back{display:inline-block;margin-bottom:20px;color:var(--cyan)}

/* 留言表单 */
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--line);
  background:rgba(7,11,24,.6);color:var(--text);font-size:14px;font-family:inherit;outline:none;transition:.2s;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--cyan);box-shadow:var(--glow)}
.field textarea{min-height:120px;resize:vertical}

/* 页脚 */
footer.ft{margin-top:40px;border-top:1px solid var(--line);background:rgba(7,11,24,.85);padding:46px 0 26px}
.ft-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.ft h4{color:var(--cyan);margin-bottom:14px;font-size:15px}
.ft p,.ft a{color:var(--text-dim);font-size:14px;display:block;margin:6px 0}
.ft a:hover{color:var(--cyan)}
.ft-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;text-align:center;color:var(--text-dim);font-size:13px}

/* 滚动揭示动画 */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* 闪信 */
.flash{padding:12px 18px;border-radius:10px;margin:0 0 18px;font-size:14px}
.flash.ok{background:rgba(0,229,255,.12);border:1px solid var(--cyan);color:var(--cyan)}
.flash.err{background:rgba(255,43,214,.12);border:1px solid var(--magenta);color:#ffb8f0}

/* 响应式 */
@media(max-width:980px){
  .grid-3,.grid-4,.case-grid{grid-template-columns:repeat(2,1fr)}
  .about-hq,.map-wrap{grid-template-columns:1fr}
  #chinamap{height:420px}
  .policy{grid-template-columns:1fr}
}
@media(max-width:680px){
  .nav menu,nav.menu{position:fixed;top:66px;right:0;width:230px;flex-direction:column;background:var(--panel-solid);border-left:1px solid var(--line);padding:18px;gap:14px;transform:translateX(110%);transition:.3s}
  nav.menu.open{transform:none}
  .menu-toggle{display:block}
  .grid-2,.grid-3,.grid-4,.case-grid,.form-row{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .ft-grid{grid-template-columns:1fr}
}