/* ====== 王牌电机 官网主题 ====== */
:root{
  --navy:#14224a; --navy-2:#1d2f5e; --blue:#2f6de0; --blue-2:#4f8af5;
  --ink:#1a2233; --muted:#6b7a90; --line:#e7ecf4; --bg:#f7f9fc;
  --rad:16px; --shadow:0 8px 26px rgba(25,45,90,.07);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{height:40px;width:auto}
.brand-text{line-height:1.1}
.brand-name{font-size:20px;font-weight:800;color:var(--navy)}
.brand-sub{font-size:11px;letter-spacing:2px;color:var(--muted)}
.nav{display:flex;gap:26px}
.nav a{font-size:15px;color:#39445d;transition:color .2s}
.nav a:hover,.nav a.active{color:var(--blue)}
.header-tools{display:flex;align-items:center;gap:10px}
.icon-btn{border:none;background:#eef2fa;width:40px;height:40px;border-radius:12px;cursor:pointer;font-size:16px;color:var(--navy)}
.menu-btn{display:none}
.mobile-menu{display:none;flex-direction:column;background:#fff;border-bottom:1px solid var(--line)}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:14px 24px;border-top:1px solid #f2f4f9;color:var(--navy)}

/* hero */
.hero{position:relative;color:#fff;overflow:hidden;background:var(--navy)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.55}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(20,34,74,.75),rgba(47,109,224,.55))}
.hero-inner{position:relative;z-index:1;max-width:780px;padding:96px 0 80px}
.eyebrow{letter-spacing:4px;font-size:13px;color:#bcd0ff}
.hero h1{font-size:46px;line-height:1.2;margin:16px 0;font-weight:800}
.hero p.lead{font-size:18px;color:#d8e2ff;max-width:640px}
.hero-cta{display:flex;gap:16px;margin-top:34px}
.btn{padding:13px 30px;border-radius:12px;font-size:15px;font-weight:600;transition:all .2s;display:inline-block}
.btn-solid{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(47,109,224,.4)}
.btn-solid:hover{background:var(--blue-2);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.45);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero-stats{display:flex;gap:52px;margin-top:54px;position:relative;z-index:1}
.stat strong{font-size:32px;font-weight:800;display:block}
.stat span{font-size:13px;color:#b9c8ee}

/* sections */
.section{padding:72px 0}
.section-tight{padding:0 0 40px}
.section-head{text-align:center;margin-bottom:40px}
.section-head h2{font-size:30px;font-weight:800;color:var(--navy)}
.section-head p{color:var(--muted);margin-top:8px;max-width:720px;margin-left:auto;margin-right:auto}
.section-head.light h2{color:#fff}
.section-head.light p{color:rgba(255,255,255,.78)}
.center{text-align:center}

/* cards / masonry */
.masonry{column-count:3;column-gap:24px}
@media(max-width:980px){.masonry{column-count:2}}
@media(max-width:640px){.masonry{column-count:1}}
.card{break-inside:avoid;margin:0 0 24px;background:#fff;border-radius:var(--rad);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:0 16px 38px rgba(25,45,90,.15)}
.card-img{aspect-ratio:16/10;background-size:cover;background-position:center;position:relative}
.card-img .tag{position:absolute;left:16px;bottom:16px;background:rgba(255,255,255,.9);color:var(--navy);padding:4px 12px;border-radius:20px;font-size:12px;font-weight:600}
.card-body{padding:18px 22px 22px}
.card-body h3{font-size:17px;font-weight:700;margin-bottom:6px;color:var(--navy)}
.card-body p{font-size:14px;color:var(--muted)}
.card-meta{margin-top:12px;font-size:12px;color:#9aa7bd}

/* product category cards */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:900px){.cat-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.cat-grid{grid-template-columns:1fr}}
.cat-card{background:#fff;border-radius:var(--rad);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.cat-card:hover{transform:translateY(-5px)}
.cat-card .img{height:180px;background-size:cover;background-position:center}
.cat-card .body{padding:22px}
.cat-card h3{color:var(--navy);font-size:20px}
.cat-card h3 small{display:block;font-size:12px;color:var(--muted);font-weight:600;letter-spacing:1px;margin-top:4px}
.cat-card p{color:var(--muted);font-size:14px;margin-top:10px}

/* spec tables */
.spec-table{width:100%;border-collapse:collapse;font-size:13.5px;background:#fff;border-radius:12px;overflow:hidden}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:9px 11px;text-align:center;white-space:nowrap}
.spec-table thead th{background:var(--navy);color:#fff;font-weight:600;position:sticky;top:0}
.spec-table tbody tr:nth-child(even){background:#f5f8fd}
.spec-table .frame-col{background:#eef3fc;font-weight:700;color:var(--navy)}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px;-webkit-overflow-scrolling:touch}
.table-wrap{margin-bottom:34px}
.table-caption{font-size:16px;font-weight:700;color:var(--navy);margin:26px 0 12px}
.badge{display:inline-block;background:#eaf1ff;color:var(--blue);font-size:12px;font-weight:600;padding:3px 10px;border-radius:14px;margin:0 6px 6px 0}
.param-chips{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.chip{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 16px;min-width:110px}
.chip strong{display:block;font-size:18px;color:var(--blue)}
.chip span{font-size:12px;color:var(--muted)}

/* apps grid */
.apps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:900px){.apps-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.apps-grid{grid-template-columns:1fr}}
.app-card{background:#fff;border-radius:var(--rad);padding:26px 24px;box-shadow:var(--shadow)}
.app-card .icon{font-size:28px}
.app-card h3{color:var(--navy);font-size:18px;margin-top:10px}
.app-card h3 small{display:block;font-size:12px;color:var(--muted);font-weight:600;margin-top:2px}
.app-card p{color:var(--muted);font-size:14px;margin-top:10px}

/* about band */
.about-band{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;padding:72px 0}
.about-band p{color:#c6d0ea;max-width:840px;margin:0 auto;text-align:center;font-size:16px}
.certs{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:44px}
@media(max-width:900px){.certs{grid-template-columns:repeat(2,1fr)}}
.cert{background:#fff;border-radius:12px;padding:12px;text-align:center}
.cert img{height:120px;object-fit:contain;margin:0 auto}
.cert span{display:block;font-size:13px;color:var(--navy);margin-top:8px;font-weight:600}

/* articles */
.article-card .card-img{aspect-ratio:16/10}
.article-meta{font-size:12px;color:var(--muted)}

/* contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:900px){.contact-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.contact-grid{grid-template-columns:1fr}}
.contact-item{background:#fff;border-radius:var(--rad);padding:26px;box-shadow:var(--shadow)}
.contact-item .icon{font-size:24px}
.contact-item h3{color:var(--navy);font-size:16px;margin-top:8px}
.contact-item p{color:var(--muted);font-size:14px;margin-top:6px;word-break:break-all}

/* breadcrumb */
.crumbs{font-size:13px;color:var(--muted);padding:18px 0}
.crumbs a{color:var(--blue)}

/* in-page section nav */
.section-nav{position:sticky;top:70px;z-index:90;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.section-nav .inner{display:flex;gap:6px;overflow-x:auto;padding:10px 0;white-space:nowrap}
.section-nav a{font-size:14px;color:#39445d;padding:6px 14px;border-radius:20px;background:#eef2fa;flex:0 0 auto}
.section-nav a:hover{background:var(--blue);color:#fff}
/* z4 summary table link */
.spec-table a{color:var(--blue);font-weight:600}

/* footer */
.site-footer{background:#101a30;color:#8b95ad;padding:36px 0;text-align:center;font-size:13px}
.site-footer .foot-brand{font-size:16px;font-weight:700;color:#d6def2;margin-bottom:8px}
.site-footer a{color:#7f8db0}
.list-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.list-item{background:#fff;border-radius:12px;padding:18px 22px;box-shadow:var(--shadow);display:flex;gap:16px;align-items:flex-start}
.list-item h3{font-size:16px;color:var(--navy)}
.list-item p{font-size:13px;color:var(--muted)}