*{box-sizing:border-box} body{margin:0;font-family:Georgia,serif;color:#16232f;background:#fff;line-height:1.65}
a{color:#14181d} .topbar{background:#14181d;color:#fff;padding:14px 20px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
.brand{font-size:26px;font-weight:bold;letter-spacing:.5px} .brand a{color:#fff;text-decoration:none}
.cta-btn{background:#d8e84a;color:#111;padding:10px 18px;border-radius:6px;text-decoration:none;font-weight:bold;display:inline-block}
.nav{background:#f1f3ec;padding:0 20px} .nav-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px}
.nav-list li{position:relative} .nav-list a,.nav-list button{display:block;padding:12px 14px;text-decoration:none;color:#16232f;background:none;border:0;font:inherit;cursor:pointer}
.nav-list a:hover,.nav-list button:hover{background:#fff} .nav-menu{display:none;position:absolute;left:0;top:100%;background:#fff;border:1px solid #ccc;min-width:240px;z-index:20;list-style:none;margin:0;padding:0}
@media (hover:hover){.has-menu:hover > .nav-menu{display:block}} .has-menu.open > .nav-menu{display:block} .nav-menu a{padding:10px 14px}
.hero{background:#14181d;color:#fff;padding:36px 20px} .hero-title{font-size:38px;margin:0 0 10px} .hero-sub{font-size:18px;max-width:760px}
.facts-bar{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0;padding:0;list-style:none} .facts-item{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.4);padding:8px 12px;border-radius:6px}
.beam-cone{margin-top:18px;height:34px;background:linear-gradient(90deg,#d8e84a,transparent);clip-path:polygon(0 35%,100% 0,100% 100%,0 65%)}
.main{max-width:980px;margin:0 auto;padding:24px 20px} .section{margin:28px 0} .section-title{font-size:24px;border-bottom:3px solid #d8e84a;padding-bottom:6px} .lead{font-size:18px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px} .card{border:1px solid #ccc;border-radius:8px;padding:16px;background:#f1f3ec} .card-title{font-size:19px;margin:0 0 6px} .card-text{margin:0}
.table-wrap{overflow-x:auto} .spec-table,.glance-table{border-collapse:collapse;width:100%} .spec-table th,.spec-table td,.glance-table th,.glance-table td{border:1px solid #bbb;padding:9px;text-align:left}
.form{border:1px solid #ccc;border-radius:8px;padding:20px;background:#f1f3ec} .field{margin:0 0 14px} .label{display:block;font-weight:bold;margin-bottom:4px} .input,.textarea{width:100%;padding:10px;border:1px solid #999;border-radius:5px;font:inherit} .textarea{min-height:120px}
.btn{background:#14181d;color:#fff;border:0;padding:12px 22px;border-radius:6px;font-size:16px;cursor:pointer} .btn-primary{background:#d8e84a;color:#111}
.checklist{border:2px solid #d8e84a;border-radius:8px;padding:18px;background:#fffef5} .related{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0} .related-link{border:1px solid #14181d;border-radius:20px;padding:6px 14px;text-decoration:none}
.footer{background:#14181d;color:#fff;padding:28px 20px;margin-top:30px} .footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px;max-width:980px;margin:0 auto} .footer-col h3{margin-top:0} .footer-link{color:#fff;display:block;padding:3px 0}
.crumbs{font-size:14px;color:#555} .blog-list{list-style:none;padding:0} .blog-item{border-bottom:1px solid #ddd;padding:16px 0} .blog-excerpt{margin:6px 0} .note{background:#f1f3ec;border-left:4px solid #d8e84a;padding:12px 16px} .caption{font-size:14px;color:#444} .figure{margin:18px 0} img{max-width:100%;height:auto} .figure img{max-width:100%;height:auto} .img-wrap img{max-width:100%;height:auto}
@media(max-width:640px){.hero-title{font-size:28px} .nav-menu{position:static}}

/* lang-switch (stage4): minimal, does not disturb header layout */
.lang-switch{display:inline-block;position:relative}
.lang-switch summary{cursor:pointer;list-style:none;font-weight:700;padding:6px 8px}
.lang-switch summary::-webkit-details-marker{display:none}
.lang-switch ul{position:absolute;right:0;top:100%;background:#fff;border:1px solid #ccc;list-style:none;margin:0;padding:0;min-width:150px;z-index:40}
.lang-switch ul li a,.lang-switch ul li span{display:block;padding:8px 12px}

/* R2 sample: hierarchy, reading rhythm, and compact click navigation. */
body{font-family:Arial,Helvetica,sans-serif;line-height:1.75;color:#202d33}
header{position:relative;background:#14181d}
.topbar{max-width:1240px;margin:auto;padding:22px 100px 22px 32px}
.brand{letter-spacing:-.8px;font-size:30px}
.lang-switch{position:absolute;right:24px;top:26px;z-index:45;color:white;font-size:13px}
.lang-switch ul{color:#16232f}.lang-switch a{color:#16232f}
.cta-btn,.btn,.card,.form,.checklist{border-radius:2px}
.nav{padding:0 max(24px,calc((100% - 1176px)/2));border-bottom:1px solid #d4d9cd}
.nav-list a,.nav-list button{font-size:14px;padding:11px 16px}
.nav-menu{display:none;width:340px;max-height:min(440px,60vh);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 14px 30px #14181d26}
.has-menu.open > .nav-menu{display:block}
.nav-menu a{padding:10px 16px;border-bottom:1px solid #edf0e9;line-height:1.45}
.hero{padding:58px max(32px,calc((100% - 1176px)/2)) 32px;border-bottom:10px solid #d8e84a}
.hero-title{font-size:clamp(32px,4vw,56px);line-height:1.12;letter-spacing:-1.5px;max-width:880px}
.hero-sub{color:#d2d9d9;line-height:1.6;margin:24px 0}
.facts-bar{gap:0;margin-top:28px;max-width:1100px}
.facts-item{border:0;border-left:2px solid #d8e84a;background:none;border-radius:0;padding:2px 18px;margin:8px 16px 8px 0;font-size:13px;max-width:440px}
.beam-cone{height:14px;margin-top:24px;opacity:.65}
.main{max-width:1240px;padding:0 32px 48px}
.section{margin:0;padding:52px 0;border-bottom:1px solid #dce1d7}
.section-title{font-size:clamp(24px,2.5vw,32px);line-height:1.25;letter-spacing:-.6px;border:0;padding:0;margin:0 0 26px;max-width:840px}
.section p{max-width:72ch;margin:0 0 26px;line-height:1.9}
.section p:last-child{margin-bottom:0}
.section:nth-of-type(even){background:#f1f3ec;padding:42px 32px;margin:0 -32px}
.section:nth-of-type(even) .section-title{border-left:5px solid #a9bd25;padding-left:18px}
.section:nth-of-type(3n){display:grid;grid-template-columns:minmax(180px,.8fr) minmax(0,1.5fr);column-gap:64px}
.section:nth-of-type(3n) .section-title{grid-row:1 / span 3}
.main:has(.card-grid) .section:first-child{display:grid;grid-template-columns:1fr 1.5fr;column-gap:64px}
.main:has(.card-grid) .section:first-child h2{grid-row:1 / span 2}
.card-grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
.card{grid-column:span 2;background:white;border:0;border-top:3px solid #a9bd25;padding:26px 24px;min-width:0}
.card-title{font-size:20px;line-height:1.4;margin-bottom:18px;letter-spacing:-.3px}
.card-title a{text-decoration:none}.card-title a:hover{text-decoration:underline}
.card .card-text{font-size:14px;line-height:1.8;color:#536169;margin:0}
.card:nth-child(n+7){grid-column:span 3;background:transparent;border-top:1px solid #c5cdb9;padding:20px 8px}
.card:nth-child(7),.card:nth-child(8){margin-top:26px}
.card:nth-child(n+7) .card-title{font-size:17px;margin-bottom:8px}
.card:nth-child(n+7) .card-text{font-size:13px}
.table-wrap{grid-column:1/-1}.glance-table{font-size:14px;background:white}
.glance-table th{background:#26343a;color:white}.glance-table td,.glance-table th{padding:18px;border-color:#d3dacd}
.checklist{margin:48px 0;padding:32px;border:0;border-left:5px solid #a9bd25;background:#f1f3ec}
.checklist li{padding:6px 0}.related{gap:12px}.related-link{font-size:14px;border-radius:2px}
.main>p{max-width:76ch;line-height:1.9;margin:28px 0}
.footer{padding:48px 32px;margin-top:0}
.footer-grid{max-width:1176px;grid-template-columns:1fr;gap:32px}
.footer-col:first-child{border-bottom:1px solid #455056;padding-bottom:20px}
.footer-col:first-child h3{font-size:18px;max-width:44ch;margin-bottom:8px}
.footer-col:last-child{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px 28px}
.footer-col:last-child h3{grid-column:1/-1;color:#d8e84a;font-size:14px;text-transform:uppercase;letter-spacing:1px;margin-bottom:16px}
.footer-link{font-size:13px;line-height:1.6;padding:8px 0;color:#d9e0df;text-decoration:none;overflow-wrap:anywhere}
.footer-link:hover{text-decoration:underline;color:white}
@media(max-width:760px){
.topbar{padding:16px 68px 16px 18px;gap:12px}.brand{font-size:25px}.cta-btn{font-size:12px;padding:8px 10px}.lang-switch{right:12px;top:16px}
.nav{padding:0 10px}.nav-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0}.nav-list>li{position:static}
.nav-list>li>a,.nav-list>li>button{width:100%;font-size:12px;line-height:1.35;padding:8px 6px;text-align:center;min-height:34px}
.nav{position:relative}.nav-menu{position:absolute;top:100%;left:10px;width:calc(100% - 20px);min-width:0;max-height:min(320px,46dvh);overflow-y:auto}.nav-menu a{font-size:13px;padding:11px 14px}
.hero{padding:32px 20px 24px}.hero-title{letter-spacing:-.8px}.hero-sub{font-size:16px;margin:18px 0}.facts-item{font-size:12px;padding-left:10px;margin-right:8px}.beam-cone{margin-top:14px}
.main{padding:0 20px 32px}.section{padding:34px 0}.section:nth-of-type(even){padding:34px 20px;margin:0 -20px}
.section:nth-of-type(3n),.main:has(.card-grid) .section:first-child{display:block}.section-title{margin-bottom:22px}.section p{font-size:16px;line-height:1.85;margin-bottom:28px}
.card-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.card,.card:nth-child(n+7){grid-column:span 1;padding:18px 14px}.card-title{font-size:17px}.card:nth-child(n+7) .card-title{font-size:15px}.card .card-text{font-size:13px}.card:nth-child(n+7) .card-text{font-size:12px}
.footer{padding:34px 20px}.footer-col:last-child{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:20px}.footer-link{font-size:12px;padding:9px 0}.checklist{padding:24px 20px}
}
@media(max-width:380px){.topbar{align-items:flex-start;flex-direction:column;gap:8px}.card-grid{grid-template-columns:1fr}.card:nth-child(8){margin-top:0}.footer-col:last-child{column-gap:14px}}

/* R3: existing series determine visual tiers; DOM order is preserved. */
.card-grid > .card:nth-child(-n+4){grid-column:span 3;padding:34px;background:#fff;border:1px solid #d3dacd;border-top:6px solid #a9bd25;box-shadow:0 5px 14px #16232f0d;margin:0}
.card-grid > .card:nth-child(-n+4) .card-title{font-size:25px;margin-bottom:18px}
.card-grid > .card:nth-child(n+5){grid-column:span 2;padding:20px 8px;background:transparent;border:0;border-top:1px solid #bac4af;box-shadow:none;margin:0}
.card-grid > .card:nth-child(n+5) .card-title{font-size:17px;margin-bottom:10px}
.card-grid > .card .card-text{font-size:14px;line-height:1.8}
.nav-menu > li:nth-child(-n+4) > a{font-weight:700;border-left:4px solid #a9bd25;background:#f5f7ed;padding-left:12px}
.nav-menu > li:nth-child(n+5) > a{font-weight:400;color:#58656b}

/* Four rhythms: panel, left rail, spacious top rule, compact plain. */
.main > .section{min-width:0}
.main:has(.card-grid) > .section:nth-of-type(n+3){display:block;margin:26px 0;padding:28px 0;background:transparent;border:0;border-top:1px solid #dce1d7}
.main:has(.card-grid) > .section:nth-of-type(n+3) .section-title{font-size:23px;border:0;padding:0;margin-bottom:18px;max-width:38ch}
.main:has(.card-grid) > .section:nth-of-type(n+3) p{font-size:16px;line-height:1.85;max-width:76ch;margin-bottom:18px}
.main:has(.card-grid) > .section:nth-of-type(4n+3){padding:32px;border:1px solid #d3dacd;box-shadow:0 6px 18px #16232f0c;background:#fff}
.main:has(.card-grid) > .section:nth-of-type(4n+4){padding:24px 0 24px 28px;border:0;border-left:6px solid #a9bd25}
.main:has(.card-grid) > .section:nth-of-type(4n+4) p{max-width:86ch}
.main:has(.card-grid) > .section:nth-of-type(4n+5){padding:46px 0;border-top:3px solid #879964}
.main:has(.card-grid) > .section:nth-of-type(4n+5) .section-title{font-size:27px}
.main:has(.card-grid) > .section:nth-of-type(4n+6){padding:22px 0;border-top:1px solid #dce1d7}
/* The first four detail sections retain a strong shared primary panel. */
.main:has(.card-grid) > .section:nth-of-type(n+3):nth-of-type(-n+6){background:#f7f8f1;border:1px solid #cbd4be;border-top:5px solid #a9bd25;padding:32px;box-shadow:0 5px 14px #16232f0d}
.main:has(.card-grid) > .section:nth-of-type(n+3):nth-of-type(-n+6) .section-title{font-size:30px}
/* Manufacturer and guidance sections stay plain and subordinate. */
.main:has(.card-grid) > .section:nth-of-type(n+12){background:transparent;box-shadow:none;border:0;border-top:1px solid #cbd4be;padding:24px 0}
.main:has(.card-grid) > .section:nth-of-type(n+12) .section-title{font-size:22px;color:#435158}
.main:has(.card-grid) > .section:nth-of-type(n+16){padding:36px 0}
.main:has(.card-grid) > .section:nth-of-type(n+16) > p{max-width:none;column-count:2;column-gap:40px;orphans:3;widows:3}

/* Category rhythm: broad introduction, table panel, rail, top rule, quiet close. */
.main:not(:has(.card-grid)) > .section{display:block;margin:0;padding:42px 0;background:transparent;border:0;border-bottom:1px solid #dce1d7}
.main:not(:has(.card-grid)) > .section .section-title{border:0;padding:0}
.main:not(:has(.card-grid)) > .section > p{max-width:none;column-count:2;column-gap:40px;font-size:16px;line-height:1.85}
.main:not(:has(.card-grid)) > .section:has(.table-wrap){padding:30px;margin:28px 0;background:#f5f7ef;border:1px solid #cbd4be;border-top:5px solid #a9bd25;box-shadow:0 6px 18px #16232f0c}
.main:not(:has(.card-grid)) > .section:nth-of-type(3){margin:36px 0;padding:12px 0 12px 28px;border:0;border-left:6px solid #a9bd25}
.main:not(:has(.card-grid)) > .section:nth-of-type(4){padding:52px 0;border-top:3px solid #879964}
.main:not(:has(.card-grid)) > .section:nth-of-type(4) .section-title{font-size:34px}
.main:not(:has(.card-grid)) > .section:nth-of-type(5){padding:26px 0}
.main:not(:has(.card-grid)) > .section:nth-of-type(5) .section-title{font-size:24px}
@media(max-width:760px){
.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.card-grid > .card:nth-child(-n+4){grid-column:1/-1;padding:26px 22px}
.card-grid > .card:nth-child(-n+4) .card-title{font-size:23px}
.card-grid > .card:nth-child(n+5){grid-column:span 1;padding:18px 4px}
.card-grid > .card:nth-child(n+5) .card-title{font-size:17px}
.card-grid > .card .card-text{font-size:15px;line-height:1.8;overflow-wrap:anywhere}
.main:has(.card-grid) > .section:nth-of-type(n+3){margin:22px 0}
.main:has(.card-grid) > .section:nth-of-type(4n+3),.main:has(.card-grid) > .section:nth-of-type(n+3):nth-of-type(-n+6){padding:24px 20px}
.main:has(.card-grid) > .section:nth-of-type(n+3):nth-of-type(-n+6) .section-title{font-size:26px}
.main:has(.card-grid) > .section:nth-of-type(n+16) > p,.main:not(:has(.card-grid)) > .section > p{column-count:1}
.main:not(:has(.card-grid)) > .section:has(.table-wrap){padding:24px 16px}
.main:not(:has(.card-grid)) > .section:nth-of-type(4) .section-title{font-size:28px}
.glance-table{font-size:15px}.glance-table td,.glance-table th{padding:12px}
}

/* R4: homepage automatic-flow section groups and wider vertical rhythm. */
@media(min-width:761px){
.main:has(.card-grid){display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:20px;row-gap:48px}
.main:has(.card-grid) > .section{grid-column:span 12;margin:0}
.main:has(.card-grid) > .section:nth-of-type(n+3):nth-of-type(-n+14){grid-column:span 6;margin:0}
.main:has(.card-grid) > .section:nth-of-type(16){margin-top:24px}
}
@media(min-width:1024px){
.main:has(.card-grid){row-gap:56px}
.main:has(.card-grid) > .section:nth-of-type(1){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(2){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(3){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(4){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(5){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(6){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(7){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(8){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(9){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(10){grid-column:span 6}
.main:has(.card-grid) > .section:nth-of-type(11){grid-column:span 6}
.main:has(.card-grid) > .section:nth-of-type(12){grid-column:span 8}
.main:has(.card-grid) > .section:nth-of-type(13){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(14){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(15){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(16){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(17){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(18){grid-column:span 12}
}
@media(min-width:1280px){
.main:has(.card-grid){column-gap:28px;row-gap:72px}
}

/* R4: match existing detail-selector specificity for all detail and guidance margins. */
@media(min-width:761px){
.main:has(.card-grid) > .section:nth-of-type(n+3){margin:0}
.main:has(.card-grid) > .section:nth-of-type(16){margin-top:24px}
}

/* R4: large-screen spans override the paired medium-screen selector. */
@media(min-width:1024px){
.main:has(.card-grid) > .section:nth-of-type(1):nth-of-type(n+1){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(2):nth-of-type(n+1){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(3):nth-of-type(n+1){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(4):nth-of-type(n+1){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(5):nth-of-type(n+1){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(6):nth-of-type(n+1){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(7):nth-of-type(n+1){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(8):nth-of-type(n+1){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(9):nth-of-type(n+1){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(10):nth-of-type(n+1){grid-column:span 6}
.main:has(.card-grid) > .section:nth-of-type(11):nth-of-type(n+1){grid-column:span 6}
.main:has(.card-grid) > .section:nth-of-type(12):nth-of-type(n+1){grid-column:span 8}
.main:has(.card-grid) > .section:nth-of-type(13):nth-of-type(n+1){grid-column:span 4}
.main:has(.card-grid) > .section:nth-of-type(14):nth-of-type(n+1){grid-column:span 7}
.main:has(.card-grid) > .section:nth-of-type(15):nth-of-type(n+1){grid-column:span 5}
.main:has(.card-grid) > .section:nth-of-type(16):nth-of-type(n+1){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(17):nth-of-type(n+1){grid-column:span 12}
.main:has(.card-grid) > .section:nth-of-type(18):nth-of-type(n+1){grid-column:span 12}
}

@media(min-width:761px){
.main:has(.card-grid) > div.checklist.tpl,
.main:has(.card-grid) > nav.related.tpl,
.main:has(.card-grid) > figure.figure{
grid-column:1 / -1;
min-width:0;
}
}