:root{
  --bg:#f3f7fb;
  --bg2:#e9f1f8;
  --panel:#ffffff;
  --line:#d9e5ef;
  --cyan:#0a93ad;
  --green:#0d9d74;
  --blue:#1273bf;
  --txt:#13293b;
  --dim:#5a7184;
  --grad:linear-gradient(120deg,#38bdf8,#22d3ee 45%,#34d399);
  --shadow:0 14px 40px rgba(30,70,100,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.6;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
section{position:relative;padding:90px 0}
.wrap{width:min(1200px,92%);margin:0 auto}

/* ===== 背景光效与粒子 ===== */
#fx-canvas{position:fixed;inset:0;z-index:0;pointer-events:none}
.glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.28;pointer-events:none;z-index:0}
.glow.g1{width:520px;height:520px;background:#7dd3fc;top:-120px;right:-120px}
.glow.g2{width:420px;height:420px;background:#6ee7b7;bottom:-140px;left:-120px}
main,header,footer{position:relative;z-index:2}

/* ===== 导航 ===== */
header{position:fixed;top:0;left:0;right:0;z-index:50;transition:.35s}
header.scrolled{background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;width:min(1280px,94%);margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:700;letter-spacing:1px;color:var(--txt)}
.brand small{display:block;font-size:10px;font-weight:400;color:var(--dim);letter-spacing:3px}
.nav-links{display:flex;gap:28px;font-size:15px;color:var(--dim)}
.nav-links a{transition:.25s;padding:6px 2px;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--cyan)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--grad);border-radius:2px}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-phone{font-size:14px;color:var(--dim)}
.nav-phone b{color:var(--cyan);font-size:16px;font-family:Consolas,monospace}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:999px;font-size:15px;font-weight:600;cursor:pointer;border:none;transition:.3s}
.btn-grad{background:var(--grad);color:#04222b;box-shadow:0 6px 24px rgba(34,211,238,.35)}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(34,211,238,.5)}
.btn-ghost{background:transparent;color:var(--txt);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
#navToggle{display:none;background:none;border:none;color:var(--txt);font-size:24px;cursor:pointer}

/* 天猫旗舰店醒目按钮 */
.btn-tmall{background:linear-gradient(120deg,#ff7a1a,#ff5000);color:#fff;box-shadow:0 8px 26px rgba(255,80,0,.38);font-weight:700;position:relative;overflow:hidden}
.btn-tmall .arr{display:inline-block;transition:transform .3s}
.btn-tmall:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(255,80,0,.55)}
.btn-tmall:hover .arr{transform:translate(3px,-3px)}
.btn-tmall::after{content:"";position:absolute;top:0;left:-80px;width:50px;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.45),transparent);transform:skewX(-20deg);animation:shine 2.6s infinite}
@keyframes shine{0%{left:-90px}55%{left:130%}100%{left:130%}}

/* ===== Hero ===== */
.hero{min-height:100vh;display:flex;align-items:center;padding-top:110px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(1000px 500px at 78% 30%,rgba(56,189,248,.16),transparent 60%),
  radial-gradient(800px 460px at 15% 75%,rgba(52,211,153,.12),transparent 60%),
  linear-gradient(180deg,#eef6fc 0%,#f3f7fb 100%);z-index:-1}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:30px;align-items:center}
.hero-tag{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border:1px solid var(--line);border-radius:999px;color:var(--cyan);font-size:13px;letter-spacing:2px;background:rgba(34,211,238,.08)}
.hero h1{font-size:clamp(32px,4.6vw,56px);line-height:1.25;margin:22px 0 14px;font-weight:800}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:var(--dim);font-size:17px;max-width:520px}
.hero-chips{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 30px}
.chip{display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 16px;font-size:14px;box-shadow:var(--shadow)}
.chip b{color:var(--green);font-size:18px;font-family:Consolas,monospace}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
/* 3D 区域 */
.hero-3d{position:relative;height:560px;border-radius:24px;background:linear-gradient(160deg,#eaf4fb,#d8eaf6);border:1px solid var(--line);overflow:hidden;box-shadow:0 30px 80px rgba(30,70,100,.16),inset 0 0 120px rgba(34,211,238,.05)}
#solar3d{width:100%;height:100%;cursor:grab;touch-action:none}
#solar3d:active{cursor:grabbing}
.hint{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);display:flex;gap:18px;font-size:12.5px;color:var(--dim);background:rgba(255,255,255,.82);padding:8px 18px;border-radius:999px;border:1px solid var(--line);backdrop-filter:blur(6px);white-space:nowrap}
.hint .dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);display:inline-block;margin-right:6px;animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:.4;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}}
.panel-badge{position:absolute;top:16px;left:16px;background:rgba(34,211,238,.12);border:1px solid rgba(10,147,173,.4);color:#067a90;padding:7px 14px;border-radius:10px;font-size:12.5px;letter-spacing:1px}
/* 参数弹层 */
#partInfo{position:absolute;top:16px;right:16px;width:270px;background:rgba(255,255,255,.95);border:1px solid rgba(10,147,173,.35);border-radius:16px;padding:18px;backdrop-filter:blur(10px);transform:translateX(20px);opacity:0;pointer-events:none;transition:.35s;box-shadow:0 18px 50px rgba(30,70,100,.2)}
#partInfo.show{transform:none;opacity:1;pointer-events:auto}
#partInfo h4{font-size:16px;margin-bottom:4px;display:flex;align-items:center;gap:8px;color:var(--txt)}
#partInfo h4 i{width:8px;height:8px;border-radius:50%;background:var(--grad);display:inline-block}
#partInfo .sub{font-size:12px;color:var(--cyan);margin-bottom:10px}
#partInfo ul{list-style:none;font-size:13px;color:var(--dim)}
#partInfo li{display:flex;justify-content:space-between;padding:5.5px 0;border-bottom:1px dashed var(--line)}
#partInfo li span:last-child{color:var(--txt);font-weight:600;text-align:right}
#partInfo .desc{font-size:12.5px;color:var(--dim);margin-top:10px;line-height:1.7}
#partInfo .close{position:absolute;top:10px;right:12px;background:none;border:none;color:var(--dim);font-size:16px;cursor:pointer}

/* ===== 数据看板 ===== */
.dashboard{background:linear-gradient(180deg,#eaf2f9,#f3f7fb);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.dash-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:34px;flex-wrap:wrap;gap:10px}
.kicker{color:var(--cyan);font-size:13px;letter-spacing:3px;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.kicker::before{content:"";width:26px;height:2px;background:var(--grad);border-radius:2px}
.h2{font-size:clamp(24px,3vw,36px);font-weight:800}
.dash-head p{color:var(--dim);font-size:14px;max-width:420px}
.dash-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:22px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px 22px;position:relative;overflow:hidden;transition:.3s;box-shadow:var(--shadow)}
.stat:hover{transform:translateY(-4px);border-color:rgba(10,147,173,.45)}
.stat::after{content:"";position:absolute;top:0;left:0;width:100%;height:2px;background:var(--grad);opacity:.7}
.stat .lb{font-size:13px;color:var(--dim);display:flex;justify-content:space-between;align-items:center}
.stat .lb i{font-style:normal;font-size:11px;color:var(--green);display:flex;align-items:center;gap:4px}
.stat .lb i::before{content:"▲";font-size:9px}
.stat .num{font-size:clamp(26px,2.6vw,34px);font-weight:800;font-family:Consolas,"DIN Alternate",monospace;margin-top:8px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .num small{font-size:14px;color:var(--dim);-webkit-text-fill-color:var(--dim);margin-left:4px;font-weight:400}
.chart-box{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:20px 22px;display:grid;grid-template-columns:1fr 220px;gap:20px;align-items:center;box-shadow:var(--shadow)}
#powerChart{width:100%;height:150px}
.chart-side h5{font-size:14px;color:var(--txt);margin-bottom:6px}
.chart-side p{font-size:12.5px;color:var(--dim)}

/* ===== 产品区 ===== */
.cats{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 38px}
.cat{padding:10px 22px;border-radius:999px;border:1px solid var(--line);background:var(--panel);color:var(--dim);cursor:pointer;font-size:14.5px;transition:.3s}
.cat:hover{color:var(--cyan);border-color:var(--cyan)}
.cat.active{background:var(--grad);color:#04222b;font-weight:700;border-color:transparent}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.pcard{display:block;background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;position:relative;transform-style:preserve-3d;transition:transform .18s ease-out,box-shadow .3s,border-color .3s;will-change:transform;animation:float 6s ease-in-out infinite;box-shadow:var(--shadow)}
.pcard:nth-child(2n){animation-delay:-3s}
@keyframes float{0%,100%{translate:0 0}50%{translate:0 -7px}}
.pcard:hover{border-color:rgba(10,147,173,.5);box-shadow:0 24px 60px rgba(30,70,100,.18),0 0 40px rgba(34,211,238,.12)}
.pcard .imgwrap{border-radius:14px;overflow:hidden;background:#f4f7fa;display:flex;align-items:center;justify-content:center;height:190px;transform:translateZ(30px);margin-bottom:16px}
.pcard .imgwrap img{width:100%;height:100%;object-fit:contain;padding:8px;transition:.4s}
.pcard:hover .imgwrap img{transform:scale(1.06)}
.pcard .tag{position:absolute;top:26px;left:26px;background:var(--grad);color:#04222b;font-size:11.5px;font-weight:700;padding:4px 10px;border-radius:8px;transform:translateZ(40px);z-index:2}
.pcard h4{font-size:16.5px;margin-bottom:6px;transform:translateZ(20px)}
.pcard .key{font-size:12.8px;color:var(--dim);min-height:40px;transform:translateZ(16px)}
.pcard .params{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0;transform:translateZ(24px)}
.pcard .params span{font-size:11.5px;color:var(--cyan);background:rgba(34,211,238,.1);border:1px solid rgba(10,147,173,.25);border-radius:6px;padding:3px 8px}
.pcard .foot{display:flex;justify-content:space-between;align-items:center;transform:translateZ(26px)}
.pcard .warranty{font-size:12px;color:var(--green)}
.pcard .ask{font-size:13px;font-weight:600;color:var(--cyan);cursor:pointer;background:rgba(34,211,238,.12);border:1px solid rgba(10,147,173,.3);padding:7px 14px;border-radius:999px;transition:.3s}
.pcard .ask:hover{background:var(--grad);color:#04222b}
.pcard .more{font-size:12px;color:var(--dim);margin-top:10px;transform:translateZ(16px)}
.pcard .more b{color:var(--cyan)}
.cat-note{margin-top:30px;text-align:center;color:var(--dim);font-size:14px}
.cat-note b{color:var(--cyan)}

/* ===== 发电量对比 ===== */
.compare{background:linear-gradient(180deg,#f3f7fb,#eaf3f0)}
.cmp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.cmp{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:26px;position:relative;overflow:hidden;transition:.3s;box-shadow:var(--shadow)}
.cmp:hover{transform:translateY(-5px);border-color:rgba(13,157,116,.5)}
.cmp .cl{font-size:12.5px;color:var(--cyan);letter-spacing:1px}
.cmp h4{font-size:19px;margin:8px 0 4px}
.cmp .loc{font-size:12.5px;color:var(--dim);margin-bottom:18px}
.cmp .big{font-family:Consolas,monospace;font-size:40px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1}
.cmp .big small{font-size:15px;-webkit-text-fill-color:var(--dim);font-weight:400}
.cmp .bar{height:10px;background:rgba(19,41,59,.08);border-radius:99px;margin:16px 0 8px;overflow:hidden}
.cmp .bar i{display:block;height:100%;border-radius:99px;background:var(--grad);width:0;transition:width 1.4s cubic-bezier(.2,.7,.3,1)}
.cmp .sub{display:flex;justify-content:space-between;font-size:12.5px;color:var(--dim)}
.cmp .sub b{color:var(--green)}
.cmp .note{margin-top:16px;font-size:12.8px;color:var(--dim);border-top:1px dashed var(--line);padding-top:12px;line-height:1.75}
.cmp .note b{color:var(--txt)}
.cmp-cta{margin-top:36px;text-align:center;background:linear-gradient(120deg,rgba(56,189,248,.1),rgba(52,211,153,.1));border:1px solid var(--line);border-radius:18px;padding:26px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.cmp-cta h5{font-size:18px}
.cmp-cta p{color:var(--dim);font-size:13.5px}

/* ===== 案例 ===== */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.case{border-radius:20px;overflow:hidden;border:1px solid var(--line);background:var(--panel);transition:.35s;box-shadow:var(--shadow)}
.case:hover{transform:translateY(-6px);box-shadow:0 24px 60px rgba(30,70,100,.18)}
.case .im{height:200px;overflow:hidden;position:relative}
.case .im img{width:100%;height:100%;object-fit:cover;transition:.5s}
.case:hover .im img{transform:scale(1.07)}
.case .bd{padding:20px}
.case h4{font-size:16.5px;margin-bottom:8px}
.case p{font-size:13.2px;color:var(--dim);line-height:1.8}
.case .loc{display:inline-block;margin-top:12px;font-size:11.5px;color:var(--cyan);background:rgba(34,211,238,.1);padding:4px 10px;border-radius:6px;border:1px solid rgba(10,147,173,.25)}

/* ===== 新闻 ===== */
.news-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;margin-top:40px}
.news{background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.3s;display:flex;flex-direction:column;box-shadow:var(--shadow)}
.news:hover{transform:translateY(-5px);border-color:rgba(10,147,173,.4)}
.news .im{height:120px;overflow:hidden}
.news .im img{width:100%;height:100%;object-fit:cover}
.news .bd{padding:14px}
.news .date{font-size:11px;color:var(--cyan);font-family:Consolas,monospace}
.news h4{font-size:13.5px;line-height:1.55;margin:6px 0 8px;font-weight:600;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:63px}
.news p{font-size:12px;color:var(--dim);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-more{margin-top:30px;text-align:center}

/* ===== 关于/优势 ===== */
.about-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:center}
.about-txt p{color:var(--dim);font-size:14.5px;margin-bottom:14px}
.adv-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.adv{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;transition:.3s;box-shadow:var(--shadow)}
.adv:hover{border-color:rgba(13,157,116,.4);transform:translateY(-3px)}
.adv .ic{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,rgba(56,189,248,.18),rgba(52,211,153,.18));display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:12px}
.adv h5{font-size:15px;margin-bottom:6px}
.adv p{font-size:12.5px;color:var(--dim)}

/* ===== 联系 ===== */
.contact{background:linear-gradient(180deg,#eaf2f9,#f3f7fb);border-top:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.ccard{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px;text-align:center;transition:.3s;box-shadow:var(--shadow)}
.ccard:hover{border-color:rgba(10,147,173,.4);transform:translateY(-4px)}
.ccard .ic{font-size:26px;margin-bottom:10px}
.ccard h5{font-size:15px;color:var(--dim);margin-bottom:8px;font-weight:400}
.ccard .v{font-size:17px;font-weight:700;font-family:Consolas,monospace;line-height:1.7}
.ccard .v a:hover{color:var(--cyan)}
.qrs{display:flex;gap:26px;justify-content:center;margin-top:44px;flex-wrap:wrap}
.qr{text-align:center}
.qr img{width:132px;height:132px;border-radius:14px;border:1px solid var(--line);background:#fff;padding:6px;margin:0 auto 10px}
.qr p{font-size:13px;color:var(--dim)}
.qr p b{color:var(--txt);display:block;font-size:14px}

footer{padding:34px 0;border-top:1px solid var(--line);text-align:center;color:var(--dim);font-size:13px;background:#eef4f9}
footer .fbrand{font-weight:700;color:var(--txt);font-size:15px;margin-bottom:8px}
footer a{color:var(--dim)}
footer a:hover{color:var(--cyan)}
footer .beian{margin-top:6px;font-size:12px}

/* 浮动客服 */
.float-qr{position:fixed;right:22px;bottom:110px;z-index:60;width:56px;height:56px;border-radius:50%;background:var(--grad);color:#04222b;display:flex;align-items:center;justify-content:center;font-size:22px;cursor:pointer;box-shadow:0 8px 26px rgba(34,211,238,.4);transition:.3s}
.float-qr:hover{transform:scale(1.08)}
.float-qr .pop{position:absolute;right:70px;bottom:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;display:none;width:150px;text-align:center;box-shadow:var(--shadow)}
.float-qr:hover .pop{display:block}
.float-qr .pop img{width:120px;height:120px;background:#fff;padding:5px;border-radius:10px}
.float-qr .pop p{font-size:12px;color:var(--dim);margin-top:6px}
.to-top{position:fixed;right:22px;bottom:40px;z-index:60;width:56px;height:56px;border-radius:50%;border:1px solid var(--line);background:rgba(255,255,255,.92);color:var(--txt);font-size:20px;cursor:pointer;transition:.3s;display:flex;align-items:center;justify-content:center}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(36px);transition:.8s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ===== 弹窗（咨询）===== */
.modal{position:fixed;inset:0;z-index:100;background:rgba(15,40,60,.45);backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center;padding:20px}
.modal.show{display:flex}
.modal .box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;max-width:420px;width:100%;position:relative;text-align:center;box-shadow:0 30px 80px rgba(20,50,80,.3)}
.modal h3{font-size:20px;margin-bottom:6px}
.modal .p{color:var(--dim);font-size:13.5px;margin-bottom:20px}
.modal .tel{font-size:26px;font-weight:800;font-family:Consolas,monospace;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;margin-bottom:6px}
.modal .imgrow{display:flex;gap:14px;justify-content:center;margin-top:18px}
.modal .imgrow .qr img{width:110px;height:110px}
.modal .x{position:absolute;top:12px;right:16px;background:none;border:none;color:var(--dim);font-size:20px;cursor:pointer}

/* ===== 移动端 ===== */
@media (max-width:1024px){
  .prod-grid{grid-template-columns:repeat(3,1fr)}
  .news-grid{grid-template-columns:repeat(3,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .cmp-grid{grid-template-columns:1fr;max-width:560px;margin-left:auto;margin-right:auto}
  .dash-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr}
}
@media (max-width:820px){
  .nav-links{display:none;position:fixed;top:72px;left:0;right:0;background:rgba(255,255,255,.97);flex-direction:column;padding:22px 6%;gap:18px;border-bottom:1px solid var(--line);color:var(--txt)}
  .nav-links.open{display:flex}
  #navToggle{display:block}
  .nav-phone{display:none}
  .hero-grid{grid-template-columns:1fr}
  .hero{padding-top:96px;min-height:auto}
  .hero-3d{height:420px}
  .chart-box{grid-template-columns:1fr}
  .prod-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:1fr 1fr}
  #partInfo{left:12px;right:12px;top:auto;bottom:56px;width:auto;max-height:46%;overflow:auto;padding:14px}
  .hint{display:none}
  section{padding:64px 0}
}
@media (max-width:480px){
  .prod-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .cmp .big{font-size:32px}
  .nav-cta .btn{display:none}
}

/* ================= 常见问题 FAQ ================= */
.faq-list{display:grid;gap:14px;margin-top:34px}
.faq{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 22px;transition:border-color .3s,background .3s;box-shadow:var(--shadow)}
.faq:hover{border-color:rgba(10,147,173,.45)}
.faq summary{list-style:none;cursor:pointer;padding:20px 0;font-size:16.5px;font-weight:600;color:var(--txt);display:flex;align-items:center;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';flex:0 0 auto;width:26px;height:26px;line-height:24px;text-align:center;border-radius:50%;border:1px solid var(--line);color:var(--cyan);font-size:17px;font-weight:400;transition:transform .3s}
.faq[open] summary::after{content:'−';transform:rotate(180deg)}
.faq[open]{border-color:rgba(10,147,173,.4);background:#f4fbfd}
.faq-a{padding:0 0 20px;color:var(--dim);font-size:15px;line-height:1.85;max-width:960px}
.faq-a b{color:var(--txt);font-weight:600}
@media (max-width:760px){
  .faq{padding:0 16px}
  .faq summary{font-size:15px;padding:16px 0}
  .faq-a{font-size:14px}
}

/* 页脚站内链接与简介（SEO 内部链接结构） */
footer .fnav{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;margin:12px 0 14px;font-size:13px}
footer .fnav a{color:var(--dim);transition:.25s}
footer .fnav a:hover{color:var(--cyan)}
footer .fdesc{max-width:760px;margin:0 auto 14px;font-size:12.5px;line-height:1.8;color:#7a8fa1}
@media (max-width:760px){
  footer .fnav{gap:6px 12px;font-size:12px}
  footer .fdesc{font-size:11.5px;padding:0 4px}
}

/* ================= 产品详情页 ================= */
.page-hero{padding:130px 0 40px;background:linear-gradient(180deg,#eaf4fb,#f3f7fb)}
.crumb{font-size:13px;color:var(--dim);margin-bottom:14px}
.crumb a{color:var(--dim)}
.crumb a:hover{color:var(--cyan)}
.page-hero h1{font-size:clamp(26px,3.4vw,40px);font-weight:800}
.page-hero .sub{color:var(--dim);margin-top:10px;max-width:720px}
.cat-list{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;margin-top:36px}
.cat-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px 20px;text-align:center;transition:.3s;box-shadow:var(--shadow)}
.cat-card:hover{transform:translateY(-5px);border-color:rgba(10,147,173,.5);box-shadow:0 18px 44px rgba(30,70,100,.16)}
.cat-card .ic{font-size:30px;margin-bottom:10px}
.cat-card h4{font-size:16.5px;margin-bottom:6px}
.cat-card p{font-size:12.5px;color:var(--dim)}
@media (max-width:1024px){.cat-list{grid-template-columns:repeat(3,1fr)}}
@media (max-width:600px){.cat-list{grid-template-columns:repeat(2,1fr)}}
.pd-cta{margin:44px auto 0;text-align:center;background:linear-gradient(120deg,rgba(56,189,248,.1),rgba(52,211,153,.1));border:1px solid var(--line);border-radius:18px;padding:26px;max-width:760px}
.pd-cta h5{font-size:17px;margin-bottom:6px}
.pd-cta p{color:var(--dim);font-size:13.5px;margin-bottom:16px}
.pd-cta .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}