/* ============ 鑫源电气 · 独立站全局样式 ============ */
:root{
  --primary:#0f2a52; --primary-2:#16355f; --accent:#f59e0b; --accent-2:#d97706;
  --bg:#ffffff; --light:#f5f7fa; --line:#e2e8f0;
  --text:#1e293b; --muted:#64748b;
  --radius:12px; --shadow:0 2px 14px rgba(15,42,82,.08); --shadow-lg:0 10px 32px rgba(15,42,82,.16);
  --mono:'Cascadia Code','Consolas',monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,'Segoe UI','Microsoft YaHei',sans-serif;color:var(--text);background:var(--bg);line-height:1.65;font-size:15px}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 22px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border-radius:8px;font-weight:600;font-size:14.5px;transition:.2s;border:none;cursor:pointer}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2)}
.btn-outline{border:1.5px solid rgba(255,255,255,.7);color:#fff;background:transparent}
.btn-outline:hover{background:rgba(255,255,255,.12)}
.btn-dark{background:var(--primary);color:#fff}
.btn-dark:hover{background:var(--primary-2)}
.btn-light{background:#fff;color:var(--primary);border:1.5px solid var(--line)}
.btn-light:hover{border-color:var(--primary);background:var(--light)}
.tag{display:inline-block;font-size:12px;padding:3px 10px;border-radius:99px;background:var(--light);color:var(--muted);border:1px solid var(--line);font-weight:500}
.tag.accent{background:#fef3c7;color:#92400e;border-color:#fde68a}
.section{padding:76px 0}
.sec-head{max-width:720px;margin:0 auto 44px;text-align:center}
.sec-head .kicker{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:2.5px;text-transform:uppercase}
.sec-head h2{font-size:31px;margin:10px 0 12px;color:var(--primary);letter-spacing:.5px}
.sec-head p{color:var(--muted);font-size:15.5px}

/* ============ Header ============ */
.topbar{background:var(--primary);color:#cbd5e1;font-size:12.5px;padding:7px 0}
.topbar .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.topbar a:hover{color:#fff}
header.main{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.main .container{display:flex;align-items:center;justify-content:space-between;height:70px;gap:16px}
.logo{display:flex;align-items:center;gap:11px}
.logo .mark{width:42px;height:42px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:flex;align-items:center;justify-content:center;color:#fff}
.logo b{font-size:19px;color:var(--primary);letter-spacing:1px;display:block;line-height:1.1}
.logo span{font-size:10.5px;color:var(--muted);letter-spacing:3px;text-transform:uppercase}
nav.main{display:flex;align-items:center;gap:26px}
nav.main a{font-size:14.5px;color:#334155;font-weight:500;position:relative;padding:6px 0}
nav.main a:hover{color:var(--primary)}
nav.main a.on{color:var(--accent)}
nav.main a.on::after{content:'';position:absolute;left:0;right:0;bottom:0;height:2.5px;background:var(--accent);border-radius:2px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:24px;height:2.5px;background:var(--primary);border-radius:2px;transition:.25s}

/* ============ Hero ============ */
.hero{background:linear-gradient(140deg,#0b1f3d 0%,var(--primary) 55%,#1c4a8a 100%);color:#fff;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(rgba(255,255,255,.08) 1px,transparent 1px);background-size:26px 26px;opacity:.5}
.hero .container{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center;padding:86px 22px 92px;position:relative;z-index:1}
.hero .kicker{color:var(--accent);font-weight:700;letter-spacing:2.5px;font-size:13px;text-transform:uppercase}
.hero h1{font-size:42px;line-height:1.22;margin:14px 0 18px;letter-spacing:.5px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:#c3d0e2;font-size:16.5px;max-width:540px;margin-bottom:30px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.hero .points{display:flex;gap:26px;margin-top:38px;flex-wrap:wrap}
.hero .points div{font-size:13.5px;color:#a8b9d1;display:flex;align-items:center;gap:8px}
.hero .points b{color:#fff;font-size:20px;display:block;line-height:1.15}
.hero-art{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:26px;backdrop-filter:blur(4px)}
.hero-art svg{width:100%;height:auto}

/* ============ 数据条 ============ */
.band{background:var(--primary-2);color:#fff}
.band .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:30px 22px}
.band .item{text-align:center}
.band b{font-size:30px;color:var(--accent);display:block;line-height:1.15}
.band span{font-size:13px;color:#a8b9d1}

/* ============ 产品卡片 ============ */
.grid{display:grid;gap:22px}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#c7d2e0}
.card .thumb{height:190px;display:flex;align-items:center;justify-content:center;position:relative}
.card .thumb .cat{position:absolute;left:14px;top:14px;z-index:1}
.card .thumb svg{height:120px;width:auto}
.card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.card .body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1;gap:9px}
.card h3{font-size:16.5px;color:var(--primary);line-height:1.4}
.card .model{font-family:var(--mono);font-size:12.5px;color:var(--accent-2);background:#fffbeb;border:1px solid #fde68a;display:inline-block;padding:2px 9px;border-radius:5px}
.card p{font-size:13.5px;color:var(--muted);flex:1}
.card .foot{display:flex;justify-content:space-between;align-items:center;margin-top:4px}
.card .foot .price{font-size:13px;color:var(--muted)}
.card .foot a{font-size:13.5px;color:var(--accent);font-weight:600}
.card .foot a:hover{color:var(--accent-2)}

/* 分类大卡 */
.catcard{position:relative;border-radius:16px;overflow:hidden;padding:34px 30px;color:#fff;min-height:260px;display:flex;flex-direction:column;justify-content:flex-end;transition:.25s}
.catcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.catcard.motor{background:linear-gradient(135deg,#1c4a8a,#0f2a52)}
.catcard.transformer{background:linear-gradient(135deg,#b45309,#92400e)}
.catcard svg{position:absolute;right:-22px;top:-22px;opacity:.16;width:210px;height:210px}
.catcard h3{font-size:23px;margin-bottom:6px}
.catcard p{font-size:14px;opacity:.85;margin-bottom:16px}
.catcard a{color:#fff;font-weight:600;font-size:14px;border-bottom:2px solid var(--accent);display:inline-block;width:fit-content}

/* ============ 特点 ============ */
.feat{background:var(--light)}
.feat .grid{grid-template-columns:repeat(4,1fr)}
.feat .item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;transition:.2s}
.feat .item:hover{box-shadow:var(--shadow);border-color:#c7d2e0}
.feat .ic{width:46px;height:46px;border-radius:10px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.feat h4{font-size:16px;margin-bottom:7px;color:var(--primary)}
.feat p{font-size:13.5px;color:var(--muted)}

/* ============ 应用领域 ============ */
.apps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.apps .it{background:var(--light);border:1px solid var(--line);border-radius:10px;padding:16px 18px;font-size:14px;font-weight:600;color:#334155;display:flex;align-items:center;gap:10px}
.apps .it:hover{border-color:var(--accent);color:var(--accent-2)}

/* ============ CTA ============ */
.cta-band{background:linear-gradient(135deg,var(--primary),#1c4a8a);color:#fff;text-align:center;padding:58px 22px;border-radius:18px}
.cta-band h2{font-size:28px;margin-bottom:10px}
.cta-band p{color:#c3d0e2;margin-bottom:24px}
.cta-band .btn{font-size:15px}

/* ============ 页头 banner ============ */
.page-hero{background:linear-gradient(140deg,#0b1f3d,var(--primary));color:#fff;padding:54px 0 50px}
.page-hero h1{font-size:32px;letter-spacing:.5px}
.page-hero .crumb{color:#a8b9d1;font-size:13px;margin-top:10px}
.page-hero .crumb b{color:var(--accent);font-weight:600}

/* ============ 产品筛选 ============ */
.filters{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:34px}
.filters button{padding:9px 22px;border-radius:99px;border:1.5px solid var(--line);background:#fff;font-size:14px;cursor:pointer;transition:.2s;color:#334155;font-weight:500}
.filters button:hover{border-color:var(--primary)}
.filters button.on{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ============ 详情页 ============ */
.detail{display:grid;grid-template-columns:.95fr 1.05fr;gap:40px;align-items:start}
.detail .hero-art{background:var(--light);border-color:var(--line);padding:34px}
.detail .hero-art img{width:100%;height:auto;object-fit:contain;border-radius:12px}
.detail .title{color:var(--primary);font-size:26px;margin:8px 0 6px}
.detail .model{font-family:var(--mono);color:var(--accent-2);background:#fffbeb;border:1px solid #fde68a;display:inline-block;padding:4px 12px;border-radius:6px;font-size:13px}
.detail .lead{color:var(--muted);margin:14px 0 20px;font-size:15px}
.specs{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:14px 0}
.specs td{padding:9px 14px;border-bottom:1px solid #f1f5f9;font-size:13.5px}
.specs td:first-child{width:132px;font-weight:600;color:var(--primary);background:#f8fafc}
.specs tr:last-child td{border-bottom:none}
.detail ul.features{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px 14px;margin:14px 0}
.detail ul.features li{font-size:13.8px;color:#334155;display:flex;gap:8px;align-items:center}
.detail ul.features li::before{content:'✓';color:var(--accent);font-weight:700}
.related{margin-top:64px}

/* ============ 表单 ============ */
.form-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:34px;box-shadow:var(--shadow)}
.form-card h3{font-size:19px;color:var(--primary);margin-bottom:6px}
.form-card .sub{color:var(--muted);font-size:13.5px;margin-bottom:22px}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.fgrid .full{grid-column:1/-1}
.fgroup label{display:block;font-size:13px;font-weight:600;color:#334155;margin-bottom:6px}
.fgroup label em{color:var(--accent-2);font-style:normal}
.fgroup input,.fgroup select,.fgroup textarea{width:100%;padding:11px 14px;border:1.5px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--text);transition:.15s}
.fgroup input:focus,.fgroup select:focus,.fgroup textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(15,42,82,.08)}
.fgroup textarea{min-height:120px;resize:vertical}
.form-tip{font-size:12px;color:var(--muted);margin-top:10px}
.form-ok{display:none;background:#f0fdf4;border:1px solid #86efac;color:#15803d;padding:13px 16px;border-radius:8px;font-size:14px;margin-bottom:16px}
.contact-info{display:grid;gap:14px}
.contact-info .it{display:flex;gap:14px;align-items:flex-start;background:var(--light);border:1px solid var(--line);border-radius:12px;padding:18px 20px}
.contact-info .ic{width:42px;height:42px;flex:none;border-radius:10px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center}
.contact-info h4{font-size:14.5px;color:var(--primary)}
.contact-info p{font-size:13.5px;color:var(--muted);margin-top:3px}

/* ============ 关于页 ============ */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.about-grid h2{font-size:28px;color:var(--primary);margin:10px 0 16px}
.about-grid p{color:var(--muted);margin-bottom:12px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:18px}
.steps .it{background:var(--light);border:1px solid var(--line);border-radius:12px;padding:20px 18px;text-align:center}
.steps .n{width:34px;height:34px;margin:0 auto 10px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.steps h4{font-size:14.5px;margin-bottom:5px;color:var(--primary)}
.steps p{font-size:12.8px;color:var(--muted)}
.quals{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.quals .it{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;text-align:center}
.quals .ic{width:44px;height:44px;margin:0 auto 10px;border-radius:10px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center}
.quals h4{font-size:14.5px}
.quals p{font-size:12.5px;color:var(--muted);margin-top:4px}

/* ============ Footer ============ */
footer{background:#0b1f3d;color:#a8b9d1;margin-top:0}
footer .top{padding:52px 0 36px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px}
footer h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.5px}
footer a{display:block;font-size:13.5px;margin-bottom:9px;color:#a8b9d1}
footer a:hover{color:var(--accent)}
footer .brand p{font-size:13.5px;margin-top:12px;line-height:1.7}
footer .brand b{font-size:20px;color:#fff;letter-spacing:1px}
footer .contact li{display:flex;gap:10px;font-size:13.5px;margin-bottom:11px;align-items:flex-start}
footer .bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 0;font-size:12.5px;text-align:center}

/* ============ 返回顶部 ============ */
#toTop{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:10px;background:var(--primary);color:#fff;border:none;cursor:pointer;display:none;align-items:center;justify-content:center;box-shadow:var(--shadow-lg);z-index:99}
#toTop.show{display:flex}

/* ============ WhatsApp 浮窗 ============ */
.wa-float{position:fixed;right:22px;bottom:84px;width:54px;height:54px;border-radius:50%;background:#25D366;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(37,211,102,.45);z-index:99;transition:transform .2s,background .2s}
.wa-float:hover{transform:scale(1.08);background:#1fb958}
.wa-float .tip{position:absolute;right:66px;top:50%;transform:translateY(-50%) translateX(8px);background:rgba(17,17,17,.92);color:#fff;font-size:12.5px;padding:6px 12px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transition:.25s}
.wa-float:hover .tip{opacity:1;transform:translateY(-50%) translateX(0)}
.wa-float .pulse{position:absolute;inset:0;border-radius:50%;background:rgba(37,211,102,.5);animation:waPulse 2s ease-out infinite;z-index:-1}
@keyframes waPulse{0%{transform:scale(1);opacity:.7}100%{transform:scale(1.6);opacity:0}}

/* ============ 响应式 ============ */
@media(max-width:992px){
  .hero .container{grid-template-columns:1fr;padding:56px 22px 60px}
  .hero-art{display:none}
  .grid.cols-4,.feat .grid,.apps,.steps,.quals{grid-template-columns:repeat(2,1fr)}
  footer .top{grid-template-columns:1fr 1fr}
  .detail{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .section{padding:56px 0}
  .band .container{grid-template-columns:repeat(2,1fr);gap:14px}
  .grid.cols-3,.grid.cols-2,.fgrid{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  nav.main{position:fixed;top:0;right:-280px;width:260px;height:100vh;background:#fff;flex-direction:column;align-items:flex-start;padding:80px 30px;gap:20px;box-shadow:-8px 0 30px rgba(0,0,0,.12);transition:.3s;z-index:200}
  nav.main.open{right:0}
  nav.main a{font-size:16px}
  .burger{display:flex;z-index:210}
  .hero .cta{flex-direction:column;align-items:stretch}
  .hero .cta .btn{justify-content:center}
  .page-hero h1{font-size:26px}
  .steps{grid-template-columns:1fr}
}
@media(max-width:576px){
  .grid.cols-4,.feat .grid,.apps,.quals{grid-template-columns:1fr}
  .contact-info{grid-template-columns:1fr}
  .topbar .container{justify-content:center}
  .sec-head h2{font-size:25px}
}