*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;font-size:15px;line-height:1.65;color:var(--c-text);background:#fff}
a{color:var(--c-primary)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.site-header{background:var(--c-primary-dark)}
.header-in{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;min-height:64px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.brand svg{display:block;flex:0 0 auto;width:40px;height:40px}
.brand-txt{display:flex;flex-direction:column;justify-content:center}
.brand-name{font-size:19px;font-weight:500;color:#fff;line-height:1.15;letter-spacing:-.01em;white-space:nowrap}
.brand-tag{font-size:12px;color:rgba(255,255,255,.72);line-height:1.3;letter-spacing:.05em;white-space:nowrap}
.brand--only-text{display:block;font-size:24px;font-weight:500;letter-spacing:-.02em;color:#fff}
.top-nav{display:flex;gap:24px;align-items:center}
.top-nav a{color:rgba(255,255,255,.85);text-decoration:none;font-size:14px}
.top-nav a:hover{color:#fff;text-decoration:underline}
.catnav{display:inline-block}
.catnav-d{position:relative}
.catnav-sum{display:inline-flex;align-items:center;gap:6px;cursor:pointer;color:rgba(255,255,255,.85);list-style:none;font-size:14px;padding:5px 0;white-space:nowrap}
.catnav-sum::-webkit-details-marker{display:none}
.catnav-sum:hover{color:#fff;text-decoration:underline}
.catnav-caret{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;transition:transform .15s}
.catnav-d[open] .catnav-caret{transform:rotate(180deg)}
.catnav-list{position:absolute;left:50%;transform:translateX(-50%);top:calc(100% + 8px);z-index:70;background:#fff;border:1px solid var(--c-border);border-radius:10px;box-shadow:0 12px 32px rgba(15,23,42,.2);list-style:none;margin:0;padding:14px 18px;
column-count:4;column-gap:22px;width:max-content;max-width:calc(100vw - 16px);max-height:calc(100vh - 120px);overflow-y:auto}
.catnav-list li{margin:0 0 1px;break-inside:avoid}
.catnav-list a{display:block;padding:5px 8px;color:var(--c-text);text-decoration:none;border-radius:6px;font-size:13px;line-height:1.35}
.catnav-list a:hover{background:var(--c-bg-soft);color:var(--c-primary);text-decoration:none}
.crumbs{background:var(--c-bg-head);border-bottom:1px solid var(--c-border)}
.crumbs .wrap{padding-top:10px;padding-bottom:10px}
.breadcrumb{list-style:none;display:flex;flex-wrap:wrap;gap:6px;font-size:13px;color:var(--c-text-2);margin:0;padding:0}
.breadcrumb li+li::before{content:">";margin-right:6px;color:var(--c-text-2)}
.breadcrumb .active a{color:var(--c-text-2);text-decoration:none}
.page-body h2{font-size:20px;font-weight:var(--head-weight);margin:0 0 14px;padding-bottom:8px;border-bottom:2px solid var(--c-primary)}
.site-footer{background:var(--c-primary-dark);color:rgba(255,255,255,.8);margin-top:48px;padding:28px 0;font-size:13px}
.site-footer a{color:#fff}
.site-footer p{margin:0 0 6px}
.f-brand{font-size:16px;font-weight:700;color:#fff}
.page-body{padding:28px 0 8px;max-width:820px;margin:0 auto}
.page-body h1{font-size:28px;font-weight:var(--head-weight);line-height:1.3;margin:0 0 18px;color:var(--c-text)}
.page-body h3{font-size:17px;font-weight:600;color:var(--c-primary);margin:26px 0 8px;line-height:1.4}
.page-body p{margin:0 0 13px}
.page-body ul{margin:0 0 14px;padding-left:20px}
.page-body li{margin:0 0 6px}
.page-body strong{color:var(--c-text);font-weight:600}
.price-table{width:100%;border-collapse:collapse;margin:6px 0 18px;font-size:14px}
.price-table caption{caption-side:top;text-align:left;color:var(--c-text-2);font-size:13px;padding:0 0 6px}
.price-table th,.price-table td{border:1px solid var(--c-border);padding:8px 12px;text-align:left}
.price-table thead th{background:var(--c-bg-head);font-weight:600;color:var(--c-text)}
.price-table td:first-child{font-weight:600}
@media (max-width:600px){
.page-body{padding-top:20px}
.page-body h1{font-size:22px}
.price-table{display:block;overflow-x:auto;white-space:nowrap}
}
@media (max-width:900px){
.top-nav{gap:16px}
.brand svg{width:34px;height:34px}
.brand-name{font-size:17px}
.brand-tag{display:none}
.brand--only-text{font-size:20px}
.header-right{gap:14px}
.catnav-list{column-count:3}
}
@media (max-width:600px){
.catnav-list{column-count:2;left:0;transform:none;width:auto;max-width:none}
.header-in{gap:10px}
.header-right{width:100%;justify-content:space-between}
.top-nav{gap:12px;flex-wrap:wrap}
.top-nav a,.catnav-sum{font-size:13px}
}
.hdr-search{display:inline-flex;align-items:center}
.hdr-search input{width:140px;padding:6px 10px;border:1px solid rgba(255,255,255,.28);border-radius:6px;background:rgba(255,255,255,.10);color:#fff;font-size:13px;outline:none;transition:background .15s,border-color .15s}
.hdr-search input::placeholder{color:rgba(255,255,255,.45)}
.hdr-search input:focus{border-color:rgba(255,255,255,.6);background:rgba(255,255,255,.16)}
@media (max-width:600px){.hdr-search input{width:110px}}
@media (min-width:601px) and (max-width:880px){.catnav-list{column-count:2}}
@media (min-width:881px) and (max-width:1180px){.catnav-list{column-count:3}}
.art-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--c-text-2);margin:0 0 20px}
.art-meta .dot{color:var(--c-border)}
.art-cover{margin:0 0 22px}
.art-cover img{display:block;width:100%;height:auto;border-radius:10px}
.article-body{max-width:820px}
.article-body h2{font-size:21px;font-weight:var(--head-weight);line-height:1.35;margin:30px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--c-primary);color:var(--c-text)}
.article-body h2{clear:both}
.article-body h3{font-size:17px;font-weight:600;color:var(--c-primary);margin:24px 0 8px;line-height:1.4}
.article-body p{margin:0 0 14px}
.article-body ul,.article-body ol{margin:0 0 15px;padding-left:22px}
.article-body li{margin:0 0 6px}
.article-body img{max-width:100%;height:auto;border-radius:8px}
.article-body .fig{margin:22px 0 24px}
.article-body .fig img{display:block;width:100%;height:auto;border-radius:8px;background:#fff}
.article-body .fig-diagram img{border:1px solid var(--c-border);border-radius:10px}
.article-body .fig-product{display:grid;grid-template-columns:170px 1fr;gap:16px;align-items:center;border:1px solid var(--c-border);border-radius:12px;padding:14px;background:var(--c-bg-soft);margin:22px 0 24px}
.article-body .fig-product img{width:100%;height:170px;object-fit:contain;background:#fff;border-radius:8px;border:1px solid var(--c-border)}
.article-body .fig-product figcaption{margin:0}
.article-body .fig-product b{display:block;color:var(--c-text);font-size:15px;margin-bottom:4px}
.article-body figcaption{font-size:13px;line-height:1.65;color:var(--c-text-2);margin-top:8px}
.article-body figcaption a{color:var(--c-primary);font-weight:600;text-decoration:none;white-space:nowrap}
.article-body figcaption a:hover{text-decoration:underline}
.article-body .fig-video{display:flex;flex-direction:column;align-items:center;margin:22px 0 24px}
.article-body .fig-video video{display:block;width:100%;max-width:100%;height:auto;border-radius:10px;border:1px solid var(--c-border);background:#000}
.article-body .fig-video-vertical video{width:auto;height:min(600px,70vh)}
.article-body .fig-video video:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}
/* Vertical short: float right on wide screens so body copy wraps beside it; narrow screens fall back to full-width centered */
@media (min-width:760px){.article-body .fig-video-vertical{float:right;display:block;width:270px;margin:2px 0 20px 28px}.article-body .fig-video-vertical video{width:100%;height:auto}.article-body .fig-video-vertical figcaption{font-size:12.5px;line-height:1.55}}
@media (min-width:900px){.article-body .fig-video-vertical{width:300px;margin:2px 0 20px 32px}}
.article-body .fig-product,.article-body .fig-video:not(.fig-video-vertical),.article-body table,.article-body .cta-box{clear:both}
@media (max-width:640px){.article-body .fig-product{grid-template-columns:1fr}.article-body .fig-product img{height:200px}.article-body .fig-video-vertical video{height:auto;width:100%}}
.article-body table{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:14px}
.article-body th,.article-body td{border:1px solid var(--c-border);padding:8px 12px;text-align:left}
.article-body thead th{background:var(--c-bg-head);font-weight:600}
.article-body blockquote{margin:0 0 16px;padding:2px 0 2px 16px;border-left:3px solid var(--c-primary);color:var(--c-text-2)}
.cta-box{margin:28px 0 8px;padding:20px 22px;background:var(--c-bg-soft);border:1px solid var(--c-border);border-radius:12px}
.cta-t{font-size:17px;font-weight:600;margin:0 0 6px;color:var(--c-text)}
.cta-d{font-size:14px;color:var(--c-text-2);margin:0 0 14px}
.cta-btn{display:inline-block;background:var(--c-primary);color:#fff!important;text-decoration:none;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600}
.cta-btn:hover{background:var(--c-primary-dark);text-decoration:none}
.art-related{margin:34px 0 0;padding-top:22px;border-top:1px solid var(--c-border)}
.rel-h{font-size:18px;font-weight:600;margin:0 0 14px;border:0;padding:0}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.rel-card{display:block;border:1px solid var(--c-border);border-radius:10px;overflow:hidden;text-decoration:none;color:var(--c-text);background:#fff}
.rel-card:hover{border-color:var(--c-primary);text-decoration:none}
.rc-img{display:block;aspect-ratio:1/1;overflow:hidden;background:var(--c-bg-soft)}
.rc-img img{width:100%;height:100%;object-fit:cover;display:block}
.rc-title{display:block;padding:8px 10px 2px;font-size:13px;line-height:1.4}
.rc-sku{display:block;padding:0 10px 9px;font-size:12px;color:var(--c-text-2);letter-spacing:.03em}
/* 700–860px：auto-fill 会掉到 4 列，5 张卡变 4+1。此区间强制 5 列等分（768 平板每卡 ≈134px）。
   下限 700 是为了不把手机横屏（667/736）压到 120px 以下；上限 860 之上 auto-fill 本来就是 5 列。 */
@media (min-width:700px) and (max-width:860px){
.rel-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.rel-grid .rc-title{font-size:12px;line-height:1.35;padding:7px 8px 2px}
.rel-grid .rc-sku{padding:0 8px 8px;font-size:10.5px}
}
.art-posts .post-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.art-posts .post-list li{margin:0}
.art-posts .post-list a{display:block;border:1px solid var(--c-border);border-radius:10px;padding:12px 14px;background:#fff;color:var(--c-text);text-decoration:none;font-size:14px;line-height:1.45}
.art-posts .post-list a:hover{border-color:var(--c-primary);text-decoration:none}
.art-posts .post-list span{display:block;font-size:12px;color:var(--c-text-2);margin-top:4px;letter-spacing:.02em}

/* ---- a11y（2026-10-25）---- */
.skip{position:absolute;left:-9999px;top:0;z-index:100;padding:10px 16px;background:var(--c-primary);color:#fff;border-radius:0 0 8px 0;font-size:14px;font-weight:600;text-decoration:none}
.skip:focus{left:0;outline:2px solid #fff}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}