:root{--ink:#0f2a43;--blue:#1d5f8f;--paper:#f4f7f9;--accent:#e8a33d;--line:#c7d3dc;--steel:#3d5a73;--white:#ffffff}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:var(--blue)}
.site-header{background:var(--ink);color:var(--white)}
.header-inner{max-width:1160px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.brand{color:var(--white);text-decoration:none;font-weight:bold;font-size:20px;letter-spacing:.2px}
.brand-mark{color:var(--accent)}
.main-nav{margin-left:auto}
.nav-list{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
.nav-item{position:relative}
.nav-link{display:block;padding:8px 10px;color:var(--white);text-decoration:none;border-radius:4px}
.nav-link:hover,.nav-link:focus{background:var(--steel)}
.menu{display:none;position:absolute;left:0;top:100%;min-width:230px;list-style:none;margin:0;padding:8px 0;background:var(--white);border:1px solid var(--line);border-radius:6px;z-index:20}
.nav-item:hover .menu,.nav-item:focus-within .menu{display:block}
.nav-item.open .menu{display:block}
.dropbtn{font:inherit;background:transparent;border:0;color:var(--white);cursor:pointer;text-align:left}
.menu-link{display:block;padding:7px 14px;color:var(--ink);text-decoration:none}
.menu-link:hover{background:var(--paper)}
.cta-link{background:var(--accent);color:var(--ink);font-weight:bold}
.main{max-width:1160px;margin:0 auto;padding:28px 20px 40px;background:var(--white)}
.crumbs{font-size:14px;color:var(--steel);margin-bottom:10px}
.crumbs a{color:var(--steel)}
.hero{border-top:6px solid var(--accent);border-bottom:1px solid var(--line);padding:10px 0 18px;margin-bottom:24px}
.hero-title{font-size:34px;line-height:1.25;margin:8px 0}
.hero-lead{font-size:18px;color:var(--steel)}
.evidence-bar{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 4px}
.evidence-item{border:1px solid var(--line);border-left:5px solid var(--blue);background:var(--paper);padding:8px 12px;font-size:14px}
.blueprint-tag{display:inline-block;border:1px dashed var(--blue);color:var(--blue);padding:4px 10px;font-size:13px;letter-spacing:.4px;margin:6px 0}
.blueprint-tag--structure{border-color:#1d5f8f;background:#eef4f8}
.blueprint-tag--category{border-color:#0f2a43;background:#eef4f8}
.blueprint-tag--index{border-color:#3d5a73;background:#f4f7f9}
.blueprint-tag--detail{border-color:#1d5f8f;background:#fdf6e7}
.blueprint-tag--compare{border-color:#8a5a00;background:#fdf6e7}
.blueprint-tag--guide{border-color:#3d5a73;background:#eef4f8}
.blueprint-tag--blog{border-color:#0f2a43;background:#fdf6e7}
.section{margin:26px 0}
.section-title{font-size:23px;border-left:6px solid var(--accent);padding-left:12px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin:16px 0}
.card{border:1px solid var(--line);border-radius:8px;padding:16px;background:var(--white)}
.card-title{font-size:18px;margin:0 0 6px}
.card-title a{text-decoration:none}
.card-text{margin:0;color:var(--steel);font-size:15px}
.spec-board{border:1px solid var(--line);border-radius:8px;padding:16px;background:var(--paper);display:flex;gap:16px;flex-wrap:wrap}
.spec-item{flex:1 1 200px}
.spec-label{font-weight:bold;font-size:14px;text-transform:uppercase;letter-spacing:.4px}
.spec-value{margin:2px 0 0}
.data-table{width:100%;border-collapse:collapse;margin:14px 0}
.data-table th,.data-table td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
.data-table th{background:var(--ink);color:var(--white)}
.figure{margin:18px 0}
.figure img{max-width:100%;height:auto;border:1px solid var(--line)}
.caption{font-size:14px;color:var(--steel);margin:6px 0 0}
.cta{border:2px solid var(--accent);border-radius:8px;padding:20px;margin:30px 0;background:#fdf6e7}
.cta-variant-structure{background:#fdf6e7}
.cta-variant-category{background:#eef4f8}
.cta-variant-index{background:#fdf6e7}
.cta-variant-detail{background:#eef4f8}
.cta-variant-compare{background:#fdf6e7}
.cta-variant-guide{background:#eef4f8}
.cta-variant-blog{background:#fdf6e7}
.btn{display:inline-block;padding:10px 18px;border-radius:5px;text-decoration:none;font-weight:bold;margin-right:10px}
.btn-primary{background:var(--accent);color:var(--ink)}
.btn-secondary{background:var(--ink);color:var(--white)}
.related-list{columns:2;list-style:none;padding:0}
.related-list li{margin:4px 0}
.site-footer{background:var(--ink);color:var(--white);margin-top:0}
.footer-inner{max-width:1160px;margin:0 auto;padding:26px 20px;display:flex;gap:28px;flex-wrap:wrap}
.footer-block{flex:1 1 240px}
.footer-block a{color:#cfe0ec}
.footer-note{font-size:14px;color:#cfe0ec}
.form-field{margin:14px 0}
.form-field label{display:block;font-weight:bold;margin-bottom:5px}
.text-input{width:100%;max-width:560px;padding:10px;border:1px solid var(--line);border-radius:5px}
.text-area{width:100%;max-width:560px;padding:10px;border:1px solid var(--line);border-radius:5px}
.form-note{font-size:14px;color:var(--steel)}

.main > .section:not(.cta),
.main > p,
.main > .figure{max-width:920px;margin-left:auto;margin-right:auto}
.main > p,
.main > .section:not(.cta) > p{max-width:70ch;line-height:1.8;margin-top:0;margin-bottom:26px;overflow-wrap:break-word}
.main > .section:not(.cta){margin-top:52px;margin-bottom:52px;padding:28px 24px;min-width:0}
.main > .section:not(.cta):nth-of-type(even){background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.main > .section:not(.cta) > .section-title{margin:0 0 26px;line-height:1.35}
.main > .section:not(.cta):nth-of-type(even) > .section-title{border-left:0;border-top:3px solid var(--blue);padding:14px 0 0}
.main > .section:not(.cta) > p:last-child{margin-bottom:0}
.main .card-grid{grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr));gap:20px;margin-top:32px}
.main .card,.main .spec-item{min-width:0;overflow-wrap:break-word}
.main .data-table{table-layout:fixed;overflow-wrap:anywhere}
@media (min-width:900px){
.main > .section:not(.cta):nth-of-type(even):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table)){display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr);column-gap:36px;align-items:start}
.main > .section:not(.cta):nth-of-type(even):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table)) > .section-title{grid-column:1;grid-row:1 / span 10}
.main > .section:not(.cta):nth-of-type(even):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table)) > p{grid-column:2}
}
@media (max-width:600px){
.main > .section:not(.cta){margin-top:36px;margin-bottom:36px;padding:24px 12px}
.main > .section:not(.cta) > p{line-height:1.85;margin-bottom:28px}
.main .card-grid{grid-template-columns:minmax(0,1fr);gap:18px;margin-top:28px}
.main .related-list{columns:1}
}

/* Visual sample: service hierarchy, prose compositions, and in-flow mobile navigation. */
.card:has(a[href='/pcb-manufacturing/']),
.card:has(a[href='/pcb-assembly/']){border-left:7px solid var(--blue);background:#eaf3f9;padding:24px;box-shadow:0 8px 20px rgba(15,42,67,.14)}
.card:has(a[href='/pcb-manufacturing/']) .card-title,
.card:has(a[href='/pcb-assembly/']) .card-title{font-size:24px;line-height:1.35}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)){display:block}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)) > .section-title{grid-column:auto;grid-row:auto}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(1),:nth-of-type(6)){border-left:8px solid var(--blue);background:var(--white)}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(2){background:#eaf3f9;border-top:5px solid var(--blue);border-bottom:1px solid var(--line)}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(3),:nth-of-type(7)){border:1px solid var(--line);background:var(--white);box-shadow:0 10px 26px rgba(15,42,67,.12)}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(3),:nth-of-type(7)) > .section-title{border:0;border-bottom:3px solid var(--accent);padding:0 0 18px}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(4){border:1px solid var(--line);background:#f4f7f9}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(4) > .section-title{background:var(--ink);color:var(--white);border:0;padding:22px}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(5){border-top:5px double var(--blue);background:#fffaf0}
@media (min-width:601px){
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(1),:nth-of-type(6)){display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr);column-gap:36px;align-items:start}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(1),:nth-of-type(6)) > .section-title{grid-column:1;grid-row:1 / span 10;border:0;padding:0}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(1),:nth-of-type(6)) > p{grid-column:2}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(2),:nth-of-type(5)){display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:36px;align-items:start}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(2),:nth-of-type(5)) > .section-title{grid-column:1 / -1}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):is(:nth-of-type(2),:nth-of-type(5)) > p{grid-column:auto}
}
@media (max-width:600px){
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)){display:block}
.header-inner > .navrow,.main-nav{width:100%;min-width:0}
.main-nav{margin-left:0}
.nav-list{flex-direction:column;flex-wrap:nowrap;width:100%;min-width:0}
.nav-list > .nav-item{position:static;width:100%;min-width:0}
.nav-item > .nav-link{width:100%;white-space:normal;overflow-wrap:anywhere}
.nav-item > .menu{position:static;inset:auto;width:100%;min-width:0;max-width:100%;box-sizing:border-box;display:none;z-index:auto;overflow:visible}
.nav-item.open > .menu,.nav-item:hover > .menu,.nav-item:focus-within > .menu{display:block}
.menu-link{white-space:normal;overflow-wrap:anywhere}
}

/* Section 5: stacked prose composition at every viewport width. */
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(5){display:block}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(5) > .section-title{font-size:29px}
.main > .section:not(.cta):has(> p):not(:has(> .card-grid,> .spec-board,> .data-table,> .related-list)):nth-of-type(5) > p{max-width:70ch}