:root{
  --ink:#16202b; --ink-soft:#4a5866; --ink-mute:#7b8794;
  --line:#e2e7ec; --line-soft:#eef2f6;
  --bg:#ffffff; --bg-alt:#f6f8fa;
  --brand:#0b4f9e; --brand-dark:#083a75; --brand-soft:#eaf1fa;
  --radius:10px; --wrap:1080px; --narrow:760px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang HK","PingFang TC","Microsoft JhengHei","Noto Sans TC",sans-serif;
  font-size:16px; line-height:1.75; -webkit-font-smoothing:antialiased;
}
img{max-width:100%; height:auto}
a{color:var(--brand); text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--wrap); margin:0 auto; padding:0 20px}
.wrap-narrow{max-width:var(--narrow)}
.skip{position:absolute; left:-9999px}
.skip:focus{left:12px; top:12px; background:#fff; padding:8px 12px; border:1px solid var(--line); z-index:99}

/* header */
.site-header{position:sticky; top:0; z-index:40; background:rgba(255,255,255,.96); border-bottom:1px solid var(--line); backdrop-filter:saturate(180%) blur(6px)}
.header-inner{display:flex; align-items:center; gap:20px; min-height:64px}
.brand{display:flex; align-items:center; gap:10px; color:var(--ink); flex:none}
.brand:hover{text-decoration:none}
.brand-mark{width:36px; height:36px; border-radius:9px; background:var(--brand); color:#fff; display:grid; place-items:center; font-weight:600; font-size:15px; letter-spacing:.5px}
.brand-text{display:flex; flex-direction:column; line-height:1.25}
.brand-text strong{font-size:16px}
.brand-text em{font-style:normal; font-size:12px; color:var(--ink-mute)}
.site-nav{display:flex; gap:18px; margin-left:auto; font-size:14.5px}
.site-nav a{color:var(--ink-soft); padding:6px 0; border-bottom:2px solid transparent}
.site-nav a:hover{color:var(--brand); text-decoration:none}
.site-nav a.active{color:var(--brand); border-bottom-color:var(--brand); font-weight:500}
.header-call{flex:none; text-align:right; line-height:1.3; border-left:1px solid var(--line); padding-left:18px; color:var(--ink)}
.header-call:hover{text-decoration:none}
.header-call-label{display:block; font-size:11.5px; color:var(--ink-mute)}
.header-call strong{font-size:15px; color:var(--brand)}

/* 產品目錄兩層下拉：滑過或鍵盤聚焦時展開 */
.site-nav .nav-item{position:relative; display:flex; align-items:center}
.site-nav .nav-item > a{display:inline-flex; align-items:center; gap:5px}
.nav-caret{width:0; height:0; border-left:4px solid transparent; border-right:4px solid transparent;
  border-top:5px solid currentColor; opacity:.55; margin-top:2px}
.site-nav .nav-item:hover .nav-caret,
.site-nav .nav-item:focus-within .nav-caret{opacity:1}

.nav-sub{display:none; position:absolute; top:100%; left:-14px; min-width:216px; z-index:40;
  background:#fff; border:1px solid var(--line); border-radius:12px; padding:8px;
  box-shadow:0 16px 34px rgba(11,79,158,.14)}
.site-nav .nav-item:hover .nav-sub,
.site-nav .nav-item:focus-within .nav-sub{display:block}

/* 兩層大菜單：左側一級分類，右側為其對應二級分類 */
.nav-sub--mega{padding:0; min-width:260px}
.nav-l1{list-style:none; margin:0; padding:8px}
.nav-l1-item{position:relative; display:flex; align-items:center; flex-wrap:wrap}
.nav-l1-item > a{flex:1 1 auto; display:flex; align-items:center; justify-content:space-between; gap:8px;
  padding:9px 12px; border-radius:8px; color:var(--ink-soft); font-size:14px; line-height:1.5; white-space:nowrap}
.nav-l1-item > a:hover{background:var(--brand-soft); color:var(--brand); text-decoration:none}
.nav-l1-all > a{color:var(--brand); font-size:13.5px}
.nav-l1-all > a:hover{background:var(--brand-soft)}

.nav-caret-right{width:0; height:0; border-top:4px solid transparent; border-bottom:4px solid transparent;
  border-left:5px solid currentColor; opacity:.55}
.nav-l1-item:hover .nav-caret-right{opacity:1}

.nav-sub2{display:none; position:absolute; left:100%; top:0; min-width:200px; z-index:41;
  background:#fff; border:1px solid var(--line); border-radius:12px; padding:8px;
  box-shadow:0 16px 34px rgba(11,79,158,.14); margin-left:4px}
.nav-l1-item:hover .nav-sub2,
.nav-l1-item:focus-within .nav-sub2{display:block}
.nav-sub2 a{display:block; padding:9px 12px; border-radius:8px; white-space:nowrap;
  color:var(--ink-soft); font-size:14px; line-height:1.5}
.nav-sub2 a:hover{background:var(--brand-soft); color:var(--brand); text-decoration:none}
.nav-sub2 a.active{background:var(--brand-soft); color:var(--brand); font-weight:500}

/* 桌面端隱藏手機專用的二級展開按鈕 */
.nav-l2-toggle{display:none}

/* hero */
.hero{background:linear-gradient(180deg,var(--brand-soft) 0%, var(--bg) 100%); border-bottom:1px solid var(--line-soft); padding:56px 0 44px}
.eyebrow{font-size:13px; letter-spacing:.04em; color:var(--brand); margin:0 0 12px}
.hero h1{font-size:34px; line-height:1.35; margin:0 0 16px; max-width:760px}
.hero-lead{font-size:17px; color:var(--ink-soft); max-width:700px; margin:0 0 26px}
.hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-bottom:30px}
.hero-points{list-style:none; display:flex; flex-wrap:wrap; gap:10px 26px; padding:0; margin:0; font-size:14.5px; color:var(--ink-soft)}
.hero-points li{position:relative; padding-left:18px}
.hero-points li::before{content:""; position:absolute; left:0; top:9px; width:7px; height:7px; border-radius:2px; background:var(--brand)}

/* buttons */
.btn{display:inline-block; padding:12px 22px; border-radius:var(--radius); font-size:15px; font-weight:500; border:1px solid transparent; transition:background .15s,color .15s}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--brand); color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{background:#fff; color:var(--brand); border-color:#c9d8ea}
.btn-ghost:hover{background:var(--brand-soft)}

/* sections */
.section{padding:56px 0}
.section-alt{background:var(--bg-alt); border-top:1px solid var(--line-soft); border-bottom:1px solid var(--line-soft)}
.section-head{max-width:720px; margin-bottom:28px}
.section-head h2{font-size:24px; margin:0 0 8px}
.section-head p{margin:0; color:var(--ink-soft); font-size:15.5px}
.section-more{margin:28px 0 0}

/* cards */
.card-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:16px}
.card-grid-4{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card-grid-3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{display:block; background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:20px 22px; color:var(--ink); transition:border-color .15s, box-shadow .15s}
.card:hover{text-decoration:none; border-color:#c9d8ea; box-shadow:0 2px 10px rgba(11,79,158,.06)}
.card h3{font-size:17px; margin:0 0 8px; line-height:1.45}
.card p{margin:0; font-size:14.5px; color:var(--ink-soft)}
.card-sm{padding:18px 20px}
.card-more{display:inline-block; margin-top:12px; font-size:14px; color:var(--brand)}
.tag{display:inline-block; font-size:12px; color:var(--brand); background:var(--brand-soft); border-radius:5px; padding:2px 8px; margin-bottom:10px}
.case-card .case-config{margin-top:8px; font-size:13.5px; color:var(--ink-mute)}

/* breadcrumb */
.breadcrumb{background:var(--bg-alt); border-bottom:1px solid var(--line-soft); font-size:13.5px}
.breadcrumb .wrap{display:flex; flex-wrap:wrap; gap:8px; padding-top:12px; padding-bottom:12px; color:var(--ink-mute)}
.breadcrumb a{color:var(--ink-soft)}

/* page */
.page-head{padding:40px 0 8px}
.page-head h1{font-size:30px; line-height:1.4; margin:0 0 12px}
.page-lead{font-size:17px; color:var(--ink-soft); margin:0}
.page .prose{padding:28px 0 40px}

/* prose */
.prose{font-size:16.5px}
.prose h2{font-size:22px; margin:38px 0 14px; padding-top:6px}
.prose h3{font-size:18px; margin:28px 0 10px}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{padding-left:22px; margin:0 0 18px}
.prose li{margin-bottom:8px}
.prose li::marker{color:var(--brand)}
.prose strong{font-weight:600}
.prose table{width:100%; border-collapse:collapse; margin:0 0 20px; font-size:15px}
.prose th,.prose td{border:1px solid var(--line); padding:10px 12px; text-align:left}
.prose th{background:var(--bg-alt); font-weight:500}
.prose blockquote{margin:0 0 20px; padding:14px 18px; background:var(--brand-soft); border-left:3px solid var(--brand); color:var(--ink-soft)}
.prose blockquote p:last-child{margin:0}
.prose img{border-radius:var(--radius); border:1px solid var(--line)}

/* faq */
.faq{margin:8px 0 36px}
.faq h2{font-size:20px; margin:0 0 14px}
.faq details{border:1px solid var(--line); border-radius:var(--radius); padding:14px 18px; margin-bottom:10px; background:#fff}
.faq summary{cursor:pointer; font-weight:500; font-size:16px}
.faq-body{margin-top:10px; color:var(--ink-soft); font-size:15.5px}

/* inline cta */
.inline-cta{background:var(--bg-alt); border:1px solid var(--line); border-radius:var(--radius); padding:26px 28px; margin-bottom:56px}
.inline-cta h2{font-size:20px; margin:0 0 8px}
.inline-cta p{margin:0 0 18px; color:var(--ink-soft); font-size:15.5px}

/* product table */
.product-group{margin-bottom:52px}
.product-group h2{font-size:20px; margin:0 0 6px}
.product-note{color:var(--ink-mute); font-size:14.5px; margin:0 0 18px}
.group-count{font-size:13px; font-weight:400; color:var(--ink-mute); margin-left:10px}
/* 二級分類：一級分類底下再分組，每組自帶小標題與說明 */
.product-subgroup{margin:0 0 24px}
.product-subgroup:last-child{margin-bottom:0}
.product-subgroup h3{font-size:16px; margin:0 0 6px; padding-left:11px; border-left:3px solid var(--brand); line-height:1.35}
.sub-count{font-size:12.5px; font-weight:400; color:var(--ink-mute); margin-left:8px}
.product-subnote{color:var(--ink-mute); font-size:13.5px; margin:0 0 10px; padding-left:14px}
.product-subgroup-loose h3{border-left-color:var(--line)}
/* 二級分組標題本身就是通往分類頁的連結（hover 才顯示底線，平時維持標題外觀） */
.product-subgroup h3 a{color:var(--ink)}
.product-subgroup h3 a:hover{color:var(--brand)}
.sub-more{margin:10px 0 0; padding-left:14px; font-size:14px}
.group-intro{margin-bottom:34px}
/* 未分類型號區塊：大分類被刪或產品漏填分類時的兜底，外觀刻意低調 */
.product-group-orphan{border-top:1px dashed var(--line); padding-top:28px}
.product-group-orphan h2{color:var(--ink-soft)}
.table-scroll{overflow-x:auto}
.spec-table{width:100%; min-width:640px; border-collapse:collapse; font-size:14.5px}
.spec-table th,.spec-table td{border:1px solid var(--line); padding:10px 12px; text-align:left}
.spec-table th{background:var(--bg-alt); font-weight:500}
.spec-table tbody tr:nth-child(even){background:#fbfcfd}
.product-cta-note{background:var(--brand-soft); border-radius:var(--radius); padding:14px 18px; font-size:15px; color:var(--ink-soft); margin:0}
.spec-thumb{width:56px; height:56px; object-fit:contain; background:#fff; border:1px solid var(--line); border-radius:6px; padding:3px; margin-right:10px; vertical-align:middle}

/* cta band */
.cta-band{background:var(--brand); color:#fff; padding:48px 0; margin-top:8px}
.cta-inner{display:flex; flex-wrap:wrap; gap:24px; align-items:center; justify-content:space-between}
.cta-band h2{font-size:23px; margin:0 0 8px; color:#fff}
.cta-band p{margin:0; color:#d7e3f2; max-width:560px; font-size:15.5px}
.cta-actions{display:flex; flex-wrap:wrap; gap:12px}
.cta-band .btn-primary{background:#fff; color:var(--brand)}
.cta-band .btn-primary:hover{background:#eaf1fa}
.cta-band .btn-ghost{background:transparent; color:#fff; border-color:rgba(255,255,255,.5)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.12)}

/* footer */
.site-footer{background:#0f1922; color:#9fb0c0; padding:48px 0 20px; font-size:14.5px}
.footer-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr)); gap:28px}
.site-footer a{color:#cfdcea}
.site-footer p{margin:0 0 8px; line-height:1.7}
.footer-name{color:#fff; font-weight:500; font-size:16px; margin-bottom:2px}
.footer-en{color:#7b8b9c; font-size:13px; margin-bottom:12px}
.footer-h{color:#fff; font-weight:500; margin-bottom:10px}
.footer-bottom{display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; border-top:1px solid #1e2b37; margin-top:34px; padding-top:18px; font-size:13.5px; color:#7b8b9c}

/* mobile cta */
.mobile-cta{display:none}

/* 漢堡按鈕（僅小屏顯示） */
.nav-toggle{display:none; flex:none; width:42px; height:42px; border:1px solid var(--line);
  border-radius:9px; background:#fff; cursor:pointer; padding:0 10px;
  flex-direction:column; justify-content:center; align-items:stretch; gap:5px}
.nav-toggle span{display:block; height:2px; background:var(--ink); border-radius:2px; transition:transform .2s, opacity .2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media (max-width:900px){
  .site-nav{display:none; position:absolute; top:100%; left:0; right:0;
    background:#fff; border-bottom:1px solid var(--line);
    flex-direction:column; gap:0; margin-left:0; padding:8px 20px 14px;
    box-shadow:0 12px 28px rgba(11,79,158,.10); font-size:15.5px}
  .site-nav.open{display:flex}
  .site-nav a{padding:12px 4px; border-bottom:1px solid var(--line-soft)}
  .site-nav a:last-child{border-bottom:none}
  /* 手機沒有 hover，二級選單改為折疊展開 */
  .site-nav .nav-item{display:block}
  .nav-caret{display:none}
  .site-nav .nav-sub{display:block; position:static; min-width:0; padding:0 0 6px 0;
    border:none; border-radius:0; margin-left:0;
    background:transparent; box-shadow:none}
  .site-nav .nav-sub--mega{padding:0; background:transparent; border:none; box-shadow:none}
  .nav-l1{padding:0; margin:0}
  .nav-l1-item{display:flex; align-items:center; flex-wrap:wrap}
  .nav-l1-item > a{flex:1 1 auto; justify-content:flex-start; padding:10px 4px; font-size:15px; color:var(--ink-mute);
    border-bottom:1px solid var(--line-soft); border-radius:0}
  .nav-l1-item > a:hover{background:transparent; color:var(--brand)}
  .nav-l1-all > a{border-bottom:none; color:var(--brand); font-size:14px}
  .nav-caret-right{display:none}

  .nav-sub2{display:none; width:100%; position:static; padding:0 0 4px 14px; margin:0;
    border:none; border-left:2px solid var(--line-soft); border-radius:0; background:transparent; box-shadow:none}
  .nav-l1-item.open .nav-sub2{display:block}
  .nav-sub2 a{padding:9px 4px; font-size:14.5px; color:var(--ink-mute); border-bottom:1px solid var(--line-soft)}
  .nav-sub2 a:last-child{border-bottom:none}

  .nav-l2-toggle{display:inline-flex; align-items:center; justify-content:center; width:32px; height:32px;
    margin-left:8px; border:none; background:transparent; color:var(--ink-mute); cursor:pointer;
    border-radius:6px}
  .nav-l2-toggle:hover{background:var(--brand-soft); color:var(--brand)}
  .nav-l2-toggle[aria-expanded="true"] .nav-caret-sm{transform:rotate(180deg)}
  .nav-caret-sm{width:0; height:0; border-left:4px solid transparent; border-right:4px solid transparent;
    border-top:5px solid currentColor}
  .nav-toggle{display:flex}
  .header-call{border-left:none; padding-left:0; margin-left:auto}
  .hero h1{font-size:27px}
  .hero{padding:40px 0 32px}
  .section{padding:44px 0}
  .page-head h1{font-size:25px}
}
@media (max-width:600px){
  body{font-size:15.5px}
  .brand-text em{display:none}
  .header-call-label{display:none}
  .hero-actions .btn{width:100%; text-align:center}
  .cta-actions .btn{width:100%; text-align:center}
  .mobile-cta{display:grid; grid-template-columns:1fr 1fr; gap:1px; position:sticky; bottom:0; z-index:50; background:var(--line); border-top:1px solid var(--line)}
  .mobile-cta a{padding:15px 8px; text-align:center; font-size:15px; font-weight:500; background:#fff; color:var(--brand)}
  .mobile-cta a.wa{background:var(--brand); color:#fff}
  .mobile-cta a:hover{text-decoration:none}
  .site-footer{padding-bottom:76px}
}

/* ── 產品詳情頁 ───────────────────────────── */
.product-hero{display:grid; grid-template-columns:minmax(0,230px) 1fr; gap:26px; align-items:start;
  margin:0 0 34px; padding:22px; border:1px solid var(--line); border-radius:var(--radius); background:var(--bg-alt)}
.product-hero-media{margin:0; background:#fff; border:1px solid var(--line-soft); border-radius:var(--radius); padding:12px}
.product-hero-media img{display:block; width:100%; height:auto}
.product-facts{display:grid; grid-template-columns:repeat(auto-fit,minmax(190px,1fr)); gap:14px 24px; margin:0; padding:0}
.product-facts dt{font-size:12.5px; color:var(--ink-mute); margin:0 0 2px; letter-spacing:.02em}
.product-facts dd{margin:0; font-size:15px; color:var(--ink); line-height:1.6}

.prod-block{margin:40px 0 0}
.prod-block > h2{font-size:21px; margin:0 0 14px}
.check-list{list-style:none; padding:0; margin:0; display:grid; gap:9px}
.check-list li{position:relative; padding-left:24px; color:var(--ink-soft)}
.check-list li::before{content:""; position:absolute; left:3px; top:9px; width:5px; height:9px;
  border-right:2px solid var(--brand); border-bottom:2px solid var(--brand); transform:rotate(40deg)}

.spec-table-kv th{width:32%; white-space:normal; text-align:left; font-weight:500; color:var(--ink-soft); background:var(--bg-alt)}
.spec-disclaimer{font-size:13px; color:var(--ink-mute); margin:10px 0 0}
.inline-note{margin:36px 0 0; padding:16px 20px; background:var(--brand-soft); border-radius:var(--radius); font-size:15px; color:var(--ink-soft)}

/* ── 案例詳情頁 ───────────────────────────── */
.case-fact{display:flex; flex-wrap:wrap; align-items:baseline; gap:8px 14px; padding:16px 20px;
  background:var(--brand-soft); border-radius:var(--radius); margin:0 0 26px}
.case-fact-label{font-size:12.5px; color:var(--brand); letter-spacing:.04em}
.case-fact strong{font-size:16px}
.case-photo{margin:0 0 26px}
.case-photo img{border-radius:var(--radius); border:1px solid var(--line)}
.prevnext{margin:36px 0 0; padding-top:20px; border-top:1px solid var(--line); font-size:15px}

@media (max-width:640px){
  .product-hero{grid-template-columns:1fr; padding:16px; gap:18px}
  .spec-table-kv th{width:36%}
}

/* ── 圖片與視覺系統 ───────────────────────────── */
img{display:block; max-width:100%; height:auto}
figure{margin:0}

.img-badge{position:absolute; right:10px; bottom:10px; z-index:2;
  background:rgba(0,0,0,.55); color:#fff; font-size:12px; padding:3px 8px;
  border-radius:4px; letter-spacing:.02em; backdrop-filter:blur(2px)}

/* 首頁 hero 雙欄 */
.hero-inner{display:grid; grid-template-columns:1fr .85fr; gap:40px; align-items:center}
.hero-text{min-width:0}
.hero-media{position:relative; margin:0; border-radius:var(--radius); overflow:hidden;
  border:1px solid var(--line-soft); box-shadow:0 12px 40px rgba(0,0,0,.08)}
.hero-media img{width:100%; aspect-ratio:3/2; object-fit:cover}

/* 卡片縮圖 */
.card{overflow:hidden}
.card-thumb{height:150px; background-size:cover; background-position:center;
  border-bottom:1px solid var(--line); margin:-20px -22px 16px; border-radius:10px 10px 0 0}
.card-sm .card-thumb{margin:-18px -20px 14px; height:130px}
.card.has-thumb h3{margin-top:0}

/* 內頁橫幅 */
.page-banner{position:relative; margin:0; max-height:340px; overflow:hidden}
.page-banner img{width:100%; height:340px; object-fit:cover; display:block}

/* 產品與案例圖說 */
.product-hero-media, .case-photo{position:relative}
.product-hero-media figcaption, .case-photo figcaption{font-size:12.5px; color:var(--ink-mute); text-align:center; margin-top:8px; line-height:1.5}
.product-hero-media .img-badge, .case-photo .img-badge{bottom:38px}
.case-photo figcaption{margin-bottom:4px}

@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr}
  .hero-media{max-width:680px; margin:0 auto; width:100%}
  .page-banner{max-height:260px}
  .page-banner img{height:260px}
}
@media (max-width:600px){
  .card-thumb{height:130px}
  .card-sm .card-thumb{height:110px}
  .product-hero-media .img-badge, .case-photo .img-badge{bottom:34px}
}