/* TUDOU — Fresh air, quietly considered. */
:root {
  --bg:#ffffff; --surface:#ffffff; --surface-soft:#f4f4f4; --text:#171717;
  --muted:#666666; --line:#e2e2e2; --accent:#171717; --ink:#262626;
  --dark:#171717; --on-dark:#ffffff; --radius:8px; --raised:none;
  --space-sm:16px; --space-md:32px; --space-lg:64px; --space-xl:104px;
  --font:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:110px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 var(--font);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;transition:color .2s,background-color .2s,border-color .2s}
a:hover{color:var(--accent)}
button,input,select,textarea{font:inherit}button{color:inherit}
a,button,summary{touch-action:manipulation}button,summary{cursor:pointer}
button{border:0}img{display:block;max-width:100%;height:auto}
h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:500;line-height:1.4;text-wrap:balance}
h1{font-size:clamp(34px,4vw,54px);letter-spacing:-.035em;margin:12px 0 20px}
h2{font-size:clamp(27px,3vw,38px);letter-spacing:-.035em}
h3{font-size:22px;letter-spacing:-.02em}p{color:var(--muted)}
small{font-size:12px}svg{flex-shrink:0}
:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header,main,.site-footer{max-width:1440px;margin:auto;padding-inline:64px}
.site-header{position:relative;display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:100px;border-bottom:1px solid var(--line);z-index:20}
.brand{display:flex;align-items:center;gap:16px;flex-shrink:0}
.brand img{width:134px;height:34px;object-fit:cover}
.brand-name{border-left:1px solid var(--line);padding-left:16px;font-size:15px;white-space:nowrap}
.site-header nav{display:flex;align-items:center;gap:26px}
.site-header nav a{display:inline-flex;align-items:center;gap:14px;min-height:44px;font-size:14px;position:relative;white-space:nowrap}
.site-header nav a[aria-current=page]:not(.nav-contact)::after{position:absolute;content:'';bottom:2px;left:0;right:0;height:2px;background:var(--accent)}
.site-header nav .nav-contact{padding:8px 17px;border:1px solid var(--text);border-radius:4px;margin-left:6px}
.site-header nav .nav-contact:hover{color:var(--on-dark);background:var(--dark)}
.menu-toggle{display:none}
.skip-link{position:fixed;left:20px;top:-100px;padding:12px 18px;background:var(--surface);z-index:50}.skip-link:focus{top:14px}
main{min-height:65vh;padding-top:48px;padding-bottom:88px}
.page-home main{padding-top:28px}
.eyebrow{font-size:12px;letter-spacing:.12em;line-height:1.6;color:var(--ink);margin-bottom:16px;font-weight:500}
.button{display:inline-flex;align-items:center;justify-content:center;gap:28px;min-height:52px;padding:12px 24px;background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:4px;font-size:14px;font-weight:500;box-shadow:none;text-align:center}
.button:hover{border-color:var(--accent);background:var(--surface-soft)}
.button.primary{color:var(--on-dark);background:var(--accent);border-color:var(--accent)}
.button.primary:hover{background:var(--dark);border-color:var(--dark)}
.button:active{transform:translateY(1px)}
.full{width:100%}
.text-link{display:inline-flex;align-items:center;gap:20px;min-height:44px;padding:8px 0;color:var(--ink);font-size:14px;font-weight:500}
.text-link:hover{text-decoration:underline;text-underline-offset:6px}
.home-hero{display:grid;grid-template-columns:1fr 1fr;min-height:590px;gap:24px}
.hero-copy{padding:74px 18px 42px 0;display:flex;align-items:flex-start;flex-direction:column;justify-content:center}
.hero-copy .eyebrow{display:flex;align-items:center;gap:9px;margin-bottom:28px}
.status-dot{display:inline-block;flex-shrink:0;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.hero-copy h1{font-size:clamp(42px,4.8vw,70px);font-weight:500;line-height:1.27;letter-spacing:-.05em;margin:0 0 28px}
.hero-copy h1 span{color:var(--accent)}
.hero-description{font-size:17px;line-height:1.95;letter-spacing:.04em}
.hero-actions{display:flex;align-items:center;gap:28px;margin-top:34px;flex-wrap:wrap}
.hero-footnote{display:flex;align-items:center;gap:12px;margin-top:64px;color:var(--muted);font-size:12px}
.fine-rule{width:28px;height:1px;background:var(--muted)}
.hero-scene{position:relative;display:flex;align-items:center;justify-content:center;min-width:0;overflow:hidden;background:#eeeeee;border-radius:4px}
.scene-index{position:absolute;top:28px;left:30px;font-size:10px;letter-spacing:.18em;color:#666666;z-index:2}
.scene-lines{position:absolute;inset:0;overflow:hidden;background:linear-gradient(116deg,transparent 26%,rgba(255,255,255,.52) 26.2%,rgba(255,255,255,.52) 49%,transparent 49.2%)}
.scene-lines::after{content:'';position:absolute;inset:0 0 0 68%;border-left:1px solid rgba(80,80,80,.13);background:rgba(210,210,210,.24)}
.hero-product{position:relative;width:auto;height:430px;max-width:75%;object-fit:contain;filter:drop-shadow(8px 16px 14px rgba(30,30,30,.10));margin-top:0;transform:none}
.scene-caption{position:absolute;bottom:22px;left:30px;right:24px;display:flex;align-items:center;justify-content:space-between;font-size:12px;letter-spacing:.06em;color:#595959}
.scene-caption a{display:grid;place-items:center;width:44px;height:44px;border:1px solid #aaaaaa;border-radius:50%;color:var(--text)}
.scene-caption a:hover{background:var(--surface)}
.home-guide{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:28px;align-items:center;border-bottom:1px solid var(--line);padding:26px 0}
.home-guide p{font-size:13px}.home-guide a{display:flex;align-items:center;gap:14px;min-height:44px;font-size:14px;border-left:1px solid var(--line);padding-left:28px}
.home-guide a span:first-child{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}
.home-guide a span:last-child{margin-left:auto}
.home-products{margin-top:88px}
.section{margin-top:80px}
.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin-bottom:32px}
.section-heading .eyebrow{margin-bottom:12px}
.section-heading p:not(.eyebrow){font-size:15px;margin-top:14px}
.section-heading>.text-link{flex-shrink:0}
.product-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.product-card{min-width:0;overflow:hidden}
.product-art{position:relative;height:288px;display:flex;align-items:center;justify-content:center;padding:48px 24px 24px;background:var(--surface-soft);overflow:hidden;border-radius:4px}
.product-art>span:first-child{position:absolute;top:18px;left:20px;font-size:11px;color:var(--muted)}
.product-art img{width:auto;height:204px;max-width:100%;object-fit:contain;mix-blend-mode:multiply;transition:transform .35s ease}
.product-art img.rendered-product{mix-blend-mode:normal;filter:drop-shadow(3px 6px 4px rgba(30,30,30,.1))}
.product-art .product-art-arrow{position:absolute;bottom:12px;right:14px;font-size:19px;color:var(--ink)}
.product-card:hover .product-art img{transform:translateY(-5px)}
.card-body{padding:22px 2px 8px}
.card-heading{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.card-heading h3{font-size:25px;font-weight:500;letter-spacing:-.03em}
.card-heading span{font-size:12px;color:var(--muted)}
.card-body>p{font-size:13px;line-height:1.8;margin:12px 0 20px;min-height:47px}
.product-facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}
.product-facts div{min-width:0;display:flex;flex-direction:column-reverse;gap:4px}
.product-facts dt{font-size:11px;color:var(--muted)}
.product-facts dd{margin:0;font-size:17px;line-height:1.5;color:var(--text);font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.product-link{display:flex;align-items:center;justify-content:space-between;min-height:48px;font-size:13px;border-top:1px solid var(--line);margin-top:18px;color:var(--ink)}
.smart-section{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;margin-top:96px;background:var(--dark);color:var(--on-dark);padding:60px 64px;border-radius:4px}
.smart-section .eyebrow{color:#c7c7c7}.smart-copy h2{font-size:clamp(32px,3.5vw,46px);line-height:1.45;margin-bottom:24px}
.smart-copy>p:not(.eyebrow){color:#d6d6d6;font-size:15px;line-height:1.9}.smart-copy .text-link{color:var(--on-dark);margin-top:22px}
.smart-label{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #505050;padding-bottom:18px;font-size:10px;letter-spacing:.12em;color:#d0d0d0}
.smart-label .status-dot{background:#dddddd}
.feature-grid{display:grid;grid-template-columns:1fr 1fr}
.feature-grid>div{padding:25px 10px 25px 0;border-bottom:1px solid #505050}
.feature-grid>div:nth-child(even){padding-left:25px;border-left:1px solid #505050}
.feature-grid svg{width:30px;height:30px;color:#dddddd;margin-bottom:14px}
.feature-grid h3{font-size:16px;margin-bottom:4px;font-weight:400}.feature-grid p{font-size:12px;color:#d0d0d0}
.smart-note{color:#c5c5c5;font-size:11px;margin-top:16px}
.knowledge-topics,.three-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.knowledge-topics a{display:block;position:relative;min-height:310px;padding:28px;background:#f4f4f4;overflow:hidden;border-radius:4px}
.knowledge-topics a:nth-child(2){background:#eeeeee}.knowledge-topics a:nth-child(3){background:#f7f7f7}
.knowledge-topics a:hover{background:#e8e8e8}.topic-top{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}
.knowledge-topics h3{font-size:26px;line-height:1.5;margin:36px 0 18px}
.knowledge-topics p{font-size:13px;max-width:210px}
.topic-number{position:absolute;right:20px;bottom:7px;font-size:68px;font-weight:300;line-height:1;color:#cccccc;pointer-events:none}
.help-banner{display:flex;align-items:center;justify-content:space-between;gap:36px;margin-top:88px;padding:48px;background:#f1f1f1;border-radius:4px}
.help-banner h2{font-size:30px}.help-banner .eyebrow{font-size:10px;color:var(--ink);margin-bottom:12px}.help-banner p:not(.eyebrow){font-size:14px;margin-top:14px}.help-banner>.button{flex-shrink:0;background:transparent;border-color:#888888}
.site-footer{border-top:1px solid var(--line);padding-top:52px;padding-bottom:28px}
.footer-main{display:grid;grid-template-columns:2.1fr 1fr 1.3fr 1fr;gap:32px;margin-bottom:60px}
.footer-brand{font-size:25px;font-weight:500;letter-spacing:.06em}
.footer-identity p{font-size:13px;margin-top:12px}.footer-identity small{font-size:9px;letter-spacing:.16em;color:var(--muted);display:block;margin-top:22px}
.footer-column{display:flex;align-items:flex-start;flex-direction:column;gap:4px;font-size:12px}.footer-column>span{font-size:13px;margin-bottom:12px;font-weight:500}.footer-column a{color:var(--muted);padding:6px 0;min-height:32px}.footer-column a:hover{color:var(--accent)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding-top:22px;color:var(--muted)}
.footer-bottom small{font-size:10px}.footer-bottom>div{display:flex;gap:16px;flex-wrap:wrap;font-size:10px}.footer-bottom span{letter-spacing:.14em}
/* Shared interior pages */
.intro{margin:12px 0 48px;padding-bottom:36px;border-bottom:1px solid var(--line)}
.intro>p:last-child{font-size:16px;max-width:700px}.intro h1{margin:16px 0}
.breadcrumbs{font-size:12px;color:var(--muted);margin:0 0 28px}.breadcrumbs a{display:inline-block;min-height:32px;padding:4px 0}
.product-hero{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.detail-art{display:grid;place-items:center;min-height:490px;background:var(--surface-soft);border-radius:4px}
.detail-art img{height:350px;width:auto;object-fit:contain;max-width:85%;mix-blend-mode:multiply}
.detail-art img.rendered-product{mix-blend-mode:normal;filter:drop-shadow(6px 12px 8px rgba(30,30,30,.1))}
.product-hero h1{font-size:48px}.product-hero h2{font-size:25px;margin-bottom:16px}.product-hero .product-facts{margin:28px 0 32px}.product-hero .product-facts dd{font-size:27px}.product-hero .product-facts dt{font-size:13px}
.product-subnav{display:flex;gap:32px;flex-wrap:wrap;padding:18px 0;margin:42px 0;border-block:1px solid var(--line);font-size:14px}.product-subnav a{padding:6px 0}
.prose{max-width:760px;font-size:16px;line-height:1.95;overflow-wrap:anywhere}.prose h2{font-size:28px;margin:32px 0 16px}.prose h3{margin:24px 0 12px}.prose p{margin:14px 0}.prose ul,.prose ol{padding-left:24px;color:var(--muted)}.prose a{text-decoration:underline;text-underline-offset:4px;color:var(--ink)}.prose table{width:100%;border-collapse:collapse}.prose th,.prose td{border-bottom:1px solid var(--line);padding:10px;text-align:left}.prose pre{overflow:auto}.prose blockquote{margin:24px 0;padding:12px 24px;border-left:3px solid var(--accent);background:var(--surface-soft)}
.spec-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.spec-table caption{text-align:left;font-size:12px;color:var(--muted);padding:10px 0}.spec-table th,.spec-table td{padding:19px 20px;border-bottom:1px solid var(--line);vertical-align:top}.spec-table th{font-weight:500}.spec-table tr:nth-child(even){background:var(--surface-soft)}
.table-scroll{overflow-x:auto;margin-top:24px;max-width:100%}.comparison td,.comparison th{min-width:150px}.comparison thead{background:var(--surface-soft)}.comparison-toggle{padding:8px 0;font-size:18px}
.three-columns article{border-top:1px solid var(--line);padding:28px 0}.three-columns h3{margin:14px 0}.three-columns p{font-size:15px}.number{font-size:14px;color:var(--ink)}
.downloads{padding:28px 32px;background:var(--surface);border:1px solid var(--line);border-radius:4px}.downloads>h2{font-size:24px;margin-bottom:16px}.download-row{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:20px 0;border-bottom:1px solid var(--line)}.download-row:last-child{border:0}.download-row p{font-size:12px}.download-row h3{font-size:17px}.download-row>.button{flex-shrink:0}
.model-picker,.topic-picker{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 32px}.model-picker .active,.topic-picker .active{background:var(--accent);color:var(--on-dark);border-color:var(--accent)}
.type-picker{display:flex;gap:28px;border-bottom:1px solid var(--line);margin-bottom:32px}.type-picker a{min-height:44px;padding:10px 0;font-size:14px}.type-picker .active{border-bottom:2px solid var(--accent);color:var(--ink)}
.editorial-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}.editorial-card{overflow:hidden;border-bottom:1px solid var(--line)}.editorial-cover{height:260px;position:relative;background:var(--surface-soft);display:flex;align-items:center;justify-content:center;color:var(--ink);font-size:25px;overflow:hidden;border-radius:4px}.editorial-cover img{width:100%;height:100%;object-fit:cover;transition:transform .35s}.editorial-card:hover .editorial-cover img{transform:scale(1.025)}.editorial-card h2{font-size:25px;margin:12px 0}.editorial-card .meta{font-size:12px;color:var(--muted)}.video-badge{position:absolute;right:16px;bottom:16px;background:var(--surface);border-radius:4px;padding:4px 10px;font-size:12px}
.empty-state{padding:44px 0;max-width:680px}.empty-state h2{font-size:26px;margin-bottom:16px}.empty-state p{margin-bottom:24px}.pagination{display:flex;align-items:center;gap:24px;justify-content:center;margin-top:40px}
.reading{max-width:760px;margin:0 auto}.article-header{margin-bottom:36px}.article-header p{font-size:14px}.article-cover{width:100%;border-radius:4px;max-height:480px;object-fit:cover;margin:12px 0 30px}.takeaways{padding:28px 32px;background:var(--surface-soft);border-left:3px solid var(--accent);margin:32px 0}.takeaways h2{font-size:22px}.takeaways ul{padding-left:20px;margin-bottom:0;color:var(--muted)}.video-player{width:100%;aspect-ratio:16/9;background:var(--text);border-radius:4px;margin-bottom:16px}.video-fallback{font-size:14px}.video-fallback a{text-decoration:underline}.related-products{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:28px}.related-product{display:flex;align-items:center;gap:24px;background:var(--surface-soft);padding:24px;border-radius:4px}.related-product img{height:90px;width:65px;object-fit:contain;mix-blend-mode:multiply}.related-product h3{font-size:20px}.related-product p{font-size:13px}.read-next{display:block;padding:20px 0;border-bottom:1px solid var(--line);color:var(--ink)}
details{border-bottom:1px solid var(--line);padding:18px 0}summary{font-weight:500;padding:8px 0;min-height:44px}details p{margin-top:16px;font-size:15px;max-width:760px}
.case-card{display:grid;grid-template-columns:1.2fr 1fr;overflow:hidden;border:1px solid var(--line);border-radius:4px;margin:32px 0}.case-card>img{width:100%;height:100%;object-fit:cover;min-height:300px}.case-body{padding:40px}.case-body h2{margin:14px 0 20px;font-size:30px}.case-body p{font-size:15px;margin-bottom:24px}.gallery{display:grid;gap:28px;margin:32px 0}.gallery figure{margin:0}.gallery img{width:100%;border-radius:4px}.gallery figcaption{font-size:13px;color:var(--muted);margin-top:10px}
.about-brand{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:center;margin:48px 0 64px}.logo-block{min-height:280px;display:grid;place-items:center;background:var(--surface-soft);border-radius:4px}.logo-block img{width:65%;height:auto;aspect-ratio:5/1;object-fit:cover}.company-row{display:grid;grid-template-columns:140px 1fr;padding:22px 0;gap:28px;border-bottom:1px solid var(--line)}.company-row dt{color:var(--muted);font-size:14px}.company-row dd{margin:0}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.contact-card{padding:36px;background:var(--surface);border:1px solid var(--line);border-radius:4px}.contact-card h2{font-size:25px;margin-bottom:18px}.contact-card img{width:170px;margin-top:16px}.contact-card p{font-size:15px;margin:12px 0 20px}.contact-value{font-size:25px;color:var(--ink);overflow-wrap:anywhere}
.error-page{text-align:center;padding:90px 0}.error-page p{margin:24px 0 32px}.preview-banner{padding:14px 20px;border-left:3px solid var(--accent);background:var(--surface-soft);font-size:14px;margin-bottom:28px}
/* Tablet */
@media(max-width:1199px){
 .site-header,main,.site-footer{padding-inline:36px}.site-header nav{gap:18px}.site-header nav a{font-size:13px}.brand-name{display:none}.home-hero{min-height:560px}.hero-product{height:390px}.hero-copy h1{font-size:54px}.product-grid{gap:16px}.product-art{height:250px;padding-inline:18px}.product-art img{height:185px}.smart-section{padding:48px;gap:48px}.card-heading{align-items:flex-start}.card-heading span{font-size:11px}.product-facts dd{font-size:16px}.footer-main{gap:24px}
}
@media(max-width:959px){
 .site-header{min-height:88px;flex-wrap:wrap;gap:0;padding-block:20px}.brand-name{display:block}.menu-toggle{display:inline-flex;align-items:center;gap:12px;min-width:80px;min-height:44px;background:transparent;padding:8px 12px;border:1px solid var(--line);border-radius:4px;font-size:14px}.site-header nav{width:100%;display:flex;flex-wrap:wrap;gap:10px 24px;padding-top:20px}.js .site-header nav:not(.open){display:none}.site-header nav a{font-size:15px}.site-header nav .nav-contact{margin-left:0}.home-hero{gap:20px;min-height:510px}.hero-copy{padding-block:48px}.hero-copy h1{font-size:46px}.hero-copy .eyebrow{font-size:10px}.hero-description{font-size:15px}.hero-actions{gap:12px}.hero-footnote{margin-top:40px;font-size:10px}.hero-product{height:330px}.scene-caption{font-size:10px;left:22px}.scene-index{font-size:9px;left:22px}.home-guide{gap:16px;grid-template-columns:1fr 1fr 1fr}.home-guide>p{display:none}.home-guide a{padding-left:16px;font-size:13px}.home-guide a:first-of-type{border:0;padding-left:0}.product-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 24px}.product-art{height:290px}.product-art img{height:220px}.card-heading span{font-size:13px}.product-facts dd{font-size:20px}.card-body>p{min-height:0}.smart-section{gap:36px;padding:40px 32px}.smart-copy h2{font-size:34px}.feature-grid p{font-size:11px}.knowledge-topics{gap:16px}.knowledge-topics a{padding:24px 18px;min-height:310px}.knowledge-topics h3{font-size:22px}.knowledge-topics p{font-size:12px}.topic-number{font-size:52px}.help-banner{padding:36px;gap:24px}.help-banner h2{font-size:26px}.footer-main{grid-template-columns:1.8fr 1fr 1.3fr}.footer-column:last-child{grid-column:2/4}.product-hero{gap:36px}.detail-art{min-height:390px}.detail-art img{height:290px}.product-hero h1{font-size:36px}.product-hero h2{font-size:22px}.about-brand{gap:36px}.logo-block{min-height:220px}.case-body{padding:28px}
}
/* Small screens: clear reading order, generous touch targets. */
@media(max-width:639px){
 html{scroll-padding-top:24px}.site-header,main,.site-footer{padding-inline:22px}.site-header{min-height:80px;padding-block:16px}.brand img{width:112px;height:28px}.brand{gap:12px}.brand-name{font-size:13px;padding-left:12px}.menu-toggle{min-width:70px;font-size:13px;padding-inline:10px}.site-header nav{gap:8px 22px}.site-header nav a{font-size:14px}.site-header nav .nav-contact{padding:8px 12px}main{padding-top:30px;padding-bottom:52px}.page-home main{padding-top:12px}.home-hero{grid-template-columns:1fr;gap:30px}.hero-copy{padding:30px 0 0}.hero-copy .eyebrow{font-size:10px;margin-bottom:22px}.hero-copy h1{font-size:clamp(40px,10.6vw,58px);margin-bottom:22px;line-height:1.25}.hero-description{font-size:16px}.hero-actions{margin-top:28px;gap:22px}.button{min-height:50px;padding:12px 20px;gap:20px}.hero-actions .text-link{font-size:13px}.hero-footnote{margin-top:26px;font-size:11px}.hero-scene{height:390px}.hero-product{height:295px;margin-top:-8px;max-width:65%}.scene-index{top:20px;font-size:9px}.scene-caption{bottom:15px;font-size:11px}.scene-caption a{width:40px;height:40px}.home-guide{padding:18px 0;gap:8px}.home-guide a{font-size:11px;padding-left:10px;gap:8px}.home-guide a span:first-child{font-size:9px}.home-guide a span:last-child{display:none}.home-products{margin-top:56px}.section{margin-top:56px}.section-heading{gap:16px;margin-bottom:24px;align-items:flex-start;flex-direction:column}.section-heading h2{font-size:29px}.section-heading .eyebrow{font-size:10px;margin-bottom:12px}.section-heading p:not(.eyebrow){font-size:15px;margin-top:12px}.section-heading>.text-link{font-size:13px}.product-grid{gap:28px 16px}.product-art{height:225px;padding:42px 12px 22px}.product-art>span:first-child{left:12px;top:14px;font-size:10px}.product-art img{height:161px}.product-art .product-art-arrow{font-size:16px;right:10px;bottom:9px}.card-body{padding-top:16px}.card-heading{display:block}.card-heading h3{font-size:23px}.card-heading span{font-size:11px;display:block;margin-top:5px}.card-body>p{font-size:12px;margin-top:9px;margin-bottom:14px;min-height:44px}.product-facts{gap:6px;margin:16px 0;grid-template-columns:1fr}.product-facts div{flex-direction:row;align-items:baseline;justify-content:space-between;gap:6px}.product-facts dt{font-size:10px}.product-facts dd{font-size:12px}.product-link{font-size:12px;min-height:44px}.smart-section{grid-template-columns:1fr;margin-top:60px;padding:34px 26px;gap:32px}.smart-copy h2{font-size:34px}.smart-copy>p:not(.eyebrow){font-size:16px}.smart-label{font-size:9px}.feature-grid>div{padding:24px 12px 24px 0}.feature-grid>div:nth-child(even){padding-left:22px}.feature-grid p{font-size:11px}.smart-note{font-size:11px}.knowledge-topics{grid-template-columns:1fr;gap:16px}.knowledge-topics a{min-height:250px;padding:24px}.knowledge-topics h3{font-size:27px;margin:26px 0 16px}.knowledge-topics p{font-size:14px;max-width:230px}.topic-number{font-size:72px;right:22px;bottom:16px}.help-banner{align-items:flex-start;flex-direction:column;padding:30px 24px;margin-top:56px;gap:24px}.help-banner h2{font-size:28px}.help-banner p:not(.eyebrow){font-size:15px}.site-footer{padding-top:36px;padding-bottom:24px}.footer-main{grid-template-columns:1fr 1fr;gap:30px 20px;margin-bottom:36px}.footer-identity{grid-column:1/-1}.footer-column:last-child{grid-column:auto}.footer-column a{min-height:36px}.footer-bottom{align-items:flex-start;flex-direction:column;gap:14px}.footer-bottom small{font-size:10px;line-height:1.8}.footer-identity small{margin-top:14px}
 .intro{margin:8px 0 32px;padding-bottom:26px}.intro h1{font-size:34px}.intro>p:last-child{font-size:16px}.product-hero{grid-template-columns:1fr;gap:28px}.detail-art{min-height:355px}.detail-art img{height:280px}.product-hero h1{font-size:38px}.product-hero .product-facts{grid-template-columns:1fr 1fr}.product-hero .product-facts div{flex-direction:column-reverse;align-items:flex-start}.product-hero .product-facts dd{font-size:24px}.product-hero .product-facts dt{font-size:12px}.product-subnav{gap:8px 22px;margin:28px 0;padding:12px 0}.product-subnav a{font-size:13px;min-height:36px}.prose h2{font-size:25px}.spec-table th,.spec-table td{padding:15px 12px}.three-columns{grid-template-columns:1fr;gap:8px}.three-columns article{padding:24px 0}.three-columns p{font-size:16px}.downloads{padding:24px 20px}.downloads>h2{font-size:23px}.download-row{flex-wrap:wrap;gap:12px}.download-row .button{min-height:44px}.model-picker,.topic-picker{gap:10px}.model-picker .button,.topic-picker .button{font-size:13px;padding:10px 14px;min-height:44px}.type-picker{gap:24px}.editorial-grid,.related-products{grid-template-columns:1fr;gap:24px}.editorial-cover{height:220px}.takeaways{padding:24px}.about-brand{grid-template-columns:1fr;gap:30px}.logo-block{min-height:200px}.company-row{grid-template-columns:1fr;gap:6px;padding:20px 0}.contact-grid{grid-template-columns:1fr}.contact-card{padding:28px}.case-card{grid-template-columns:1fr}.case-card>img{height:230px;min-height:0}.case-body{padding:28px}.case-body h2{font-size:26px}
}
@media(max-width:359px){.site-header,main,.site-footer{padding-inline:16px}.brand-name{display:none}.hero-actions{gap:12px}.product-grid{grid-template-columns:1fr}.product-art{height:290px}.product-art img{height:225px}.card-heading{display:flex}.product-facts{grid-template-columns:1fr 1fr}.product-facts div{flex-direction:column-reverse;align-items:flex-start}}
@media(max-width:639px){.home-guide a{font-size:12px}.card-body>p{font-size:13px}.card-heading span{font-size:12px}.product-facts dt{font-size:12px}.product-facts dd{font-size:13px}.product-facts div{flex-wrap:wrap}.product-art>span:first-child{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}.product-card:hover .product-art img,.editorial-card:hover .editorial-cover img{transform:none}}

/* Product chapters: readable long-form specifications and component provenance. */
.product-chapter{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:64px;border-top:1px solid var(--line);padding-top:48px}
.product-chapter header h2{font-size:30px;line-height:1.4}.product-chapter header p{max-width:28em}
.product-chapter .prose{min-width:0}.product-chapter .prose>:first-child{margin-top:0}
.product-chapter .prose h3{font-size:21px;margin-top:36px}.product-chapter .prose strong{color:var(--text)}
.component-table{max-width:none;overflow-x:auto}.component-table table{min-width:580px;font-size:15px}.component-table th,.component-table td{padding:20px;vertical-align:top}.component-table th{background:var(--surface-soft)}.component-table td:first-child{font-weight:600;width:22%}.component-table td:nth-child(2){width:29%}
.product-subnav a{display:inline-flex;align-items:center;min-height:44px}
@media(max-width:760px){.product-chapter{grid-template-columns:1fr;gap:20px;padding-top:28px}.product-chapter header h2{font-size:26px}.product-chapter .prose h3{font-size:20px}.component-table th,.component-table td{padding:14px 12px}.product-subnav{gap:6px 20px}}

/* Product imagery and downloadable CAD view sheet. */
.product-visual-section{margin-top:72px}.product-visual-section figure{margin:0}
.product-showcase{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);background:#c4c4c4;align-items:center;overflow:hidden;border-radius:8px}
.flip-intro .product-showcase{background:#fff;border:1px solid var(--line)}
.product-showcase>a{display:block}.product-showcase img{display:block;width:100%;height:580px;object-fit:contain}
.product-showcase figcaption{padding:40px}.product-showcase h3{font-size:36px;line-height:1.4}.product-showcase p{color:#414141;max-width:24em}.product-showcase .eyebrow{color:#414141}
.visual-dimensions{display:flex;flex-wrap:wrap;gap:28px;margin:32px 0}.visual-dimensions dt{font-size:13px;color:#414141}.visual-dimensions dd{font-size:29px;margin:0;color:var(--text)}.visual-dimensions small{font-size:13px}
.dimension-sheet{border:1px solid var(--line);border-radius:8px;overflow:hidden}.dimension-sheet>a{display:block}.dimension-sheet img{display:block;width:100%;height:auto}.dimension-sheet figcaption{padding:20px 24px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.product-chapter .installation-clearance{grid-column:1 / -1;min-width:0;margin:0}.installation-clearance.dimension-sheet img{min-width:0}.installation-clearance figcaption a{display:inline-block;margin-top:8px;min-height:24px;text-decoration:underline}
@media(max-width:760px){.product-visual-section{margin-top:44px}.product-showcase{grid-template-columns:1fr}.product-showcase img{height:430px}.product-showcase figcaption{padding:12px 24px 28px}.product-showcase h3{font-size:28px}.visual-dimensions{gap:26px;margin:20px 0}.visual-dimensions dd{font-size:25px}.product-visual-section .section-heading{align-items:flex-start;flex-direction:column;gap:12px}.dimension-sheet figcaption{padding:16px}.dimension-sheet>a{overflow-x:auto}.dimension-sheet img{min-width:700px}}

/* Mi Home: supplied interface artwork, clipped with CSS without altering its contents. */
.app-feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.app-feature{min-width:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--surface)}
.flip-app-gallery .app-feature{display:flex;flex-direction:column}.flip-app-gallery .app-feature-copy{flex:1}.flip-app-fullscreen{display:block;width:100%;max-width:300px;height:auto;margin:0 auto;border:1px solid var(--line);border-radius:8px}.flip-app-gallery .app-image-caption{text-align:center}
.app-feature-copy{padding:28px 28px 12px}.app-feature-copy h3{font-size:24px;line-height:1.5}.app-feature-copy strong{color:var(--text)}.app-image-link{display:block;margin:12px 28px 24px}.app-image-caption{display:block;margin-top:12px;font-size:13px;color:var(--muted)}
.app-screen{position:relative;overflow:hidden;border-radius:8px;background:#e6f1f2}.app-screen img{position:absolute;display:block;max-width:none;width:112.15%;height:auto;left:-6.07%}
.app-screen-status{aspect-ratio:1070/500}.app-screen-status img{top:-259%}
.app-screen-airflow{aspect-ratio:1070/589}.app-screen-airflow img{top:-51.27%}
.app-screen-schedule{aspect-ratio:1070/970}.app-screen-schedule img{top:-129.38%}
.app-screen-automation{aspect-ratio:1070/1030}.app-screen-automation img{top:-154.37%}
.app-version-note{margin:0 28px 24px;font-size:13px}.app-setup{margin-top:28px;padding:32px;background:var(--surface-soft);border-radius:8px}.app-setup ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;padding-left:22px}.app-setup li{padding-left:4px}.app-setup li p{font-size:15px}.app-setup>p{font-size:13px}
@media(max-width:760px){.app-feature-grid{grid-template-columns:1fr;gap:20px}.app-feature-copy{padding:22px 20px 8px}.app-feature-copy h3{font-size:22px}.app-image-link{margin:12px 20px 22px}.app-version-note{margin:0 20px 22px}.app-setup{padding:24px 20px}.app-setup ol{grid-template-columns:1fr;gap:12px}}

/* Lead the product showcase with buying-relevant performance figures. */
.showcase-performance{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:28px 0 16px}
.showcase-performance dt{font-size:14px;color:#414141}.showcase-performance dt span{font-size:11px}
.showcase-performance dd{margin:6px 0 0;font-size:42px;line-height:1.2;font-weight:600;letter-spacing:-.04em;white-space:nowrap}.showcase-performance small{font-size:14px;font-weight:400;letter-spacing:0}
.product-showcase .showcase-test-note{font-size:12px;line-height:1.7;max-width:40em}.showcase-test-note a{text-decoration:underline;text-underline-offset:3px}
.product-showcase .visual-dimensions{margin:24px 0 10px;gap:26px;padding-top:18px;border-top:1px solid #a5a5a5}.product-showcase .visual-dimensions dd{font-size:21px}
@media(max-width:1000px) and (min-width:761px){.showcase-performance{gap:14px}.showcase-performance dd{font-size:32px}.showcase-performance small{font-size:12px}}
@media(max-width:760px){.showcase-performance{gap:16px;margin-top:24px}.showcase-performance dd{font-size:34px}.showcase-performance small{font-size:12px}.showcase-performance dt{font-size:13px}.product-showcase .visual-dimensions{gap:24px}}

/* Mi Home feature overview */
.app-capabilities{margin-bottom:32px;padding:32px;background:var(--surface-soft);border-radius:8px}
.app-capabilities>h3{margin:0 0 24px;font-size:24px}
.app-capability-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 32px;margin:0}
.app-capability-list>div{padding-top:18px;border-top:1px solid var(--line);min-width:0}
.app-capability-list dt{font-size:18px;font-weight:600;color:var(--text)}
.app-capability-list dd{margin:10px 0 0;font-size:16px;line-height:1.8;color:var(--muted)}
.app-voice-note{margin:28px 0 0;padding-top:20px;border-top:1px solid var(--line);font-size:15px}
.app-voice-note strong{color:var(--text)}
@media(max-width:1000px){.app-capability-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.app-capabilities{padding:24px 20px}.app-capability-list{grid-template-columns:1fr;gap:20px}.app-capabilities>h3{font-size:22px}}

/* PRO9: three core performance benefits */
.performance-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.performance-metric{padding:36px;background:var(--surface-soft);border-radius:var(--radius)}
.performance-metric h3{font-size:22px}
.performance-metric .performance-value{margin:22px 0 0;color:var(--text);font-size:clamp(48px,5.5vw,76px);line-height:1.15;letter-spacing:-.04em;font-weight:500}
.performance-value span{font-size:22px;letter-spacing:0}
.performance-metric .performance-label{margin:10px 0 20px;color:var(--text);font-size:15px}
.performance-filtration{margin-top:40px}
.performance-filter-stages{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:24px}
.performance-filter-stages article{border-top:1px solid var(--line);padding-top:24px}
.performance-filter-stages h4{font-size:20px;font-weight:500;margin:10px 0 12px}
.performance-filter-stages strong{color:var(--text)}
.performance-footnotes{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
.performance-footnotes p{font-size:12px;line-height:1.8;margin-top:6px}
@media(max-width:760px){.performance-metrics,.performance-filter-stages{grid-template-columns:1fr}.performance-metric{padding:26px 24px}.performance-filter-stages{gap:22px}.performance-metric h3{font-size:20px}}

.prefilter-cleaning-example{margin:24px 0 0;max-width:540px}.prefilter-cleaning-example img{width:100%;height:auto;border-radius:8px}.prefilter-cleaning-example figcaption{margin-top:12px;font-size:14px;color:var(--muted)}

.pro9-intro{margin-top:28px}.pro9-intro h1{margin:8px 0 12px}.pro9-nav{position:sticky;top:0;z-index:15;background:var(--bg);justify-content:space-between;gap:12px;padding:12px 16px;border:1px solid var(--line);border-radius:8px}.pro9-device-functions h3{margin-bottom:12px}.pro9-nav a{white-space:nowrap}
@media(max-width:760px){.pro9-nav{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;gap:24px;border-radius:0;padding:8px 12px}.pro9-intro{margin-top:20px}.pro9-intro .section-heading .button{align-self:flex-start}}

.app-examples{border-block:1px solid var(--line);padding:8px 0}.app-examples>summary{padding:16px 0;font-size:18px;font-weight:500;min-height:56px}.app-examples[open]>summary{margin-bottom:16px}.app-examples .app-feature-grid{margin-bottom:24px}
/* Consistent chapter hierarchy for the PRO9 detail page. */
.pro9-chapter{border-top:1px solid var(--line);padding-top:40px}.pro9-subsection{margin:32px 0}.pro9-subsection>.section-heading{margin-bottom:20px}.pro9-subsection h3{font-size:24px}.pro9-note{font-size:14px;margin-top:24px}.pro9-note a{text-decoration:underline}.pro9-care-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}.pro9-care-grid .prefilter-cleaning-example{margin:0}.pro9-care-steps{margin:0;padding-left:26px}.pro9-care-steps li{padding:0 0 24px 8px}.pro9-care-steps strong{font-size:20px;font-weight:500}.pro9-care-steps p{margin-top:8px}.pro9-chapter .app-examples{margin-top:24px}.pro9-chapter .dimension-sheet{margin:20px 0}.pro9-chapter .installation-clearance{max-width:960px;margin-inline:auto}#specifications>.table-scroll{margin-top:20px}
@media(max-width:760px){.pro9-care-grid{grid-template-columns:1fr;gap:20px}.pro9-chapter{padding-top:28px}.pro9-subsection h3{font-size:22px}}

.mini9-dimension-facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:28px;background:var(--surface-soft);border-radius:8px;gap:24px}.mini9-dimension-facts dt{color:var(--muted)}.mini9-dimension-facts dd{font-size:36px;margin:8px 0 0}.mini9-dimension-facts small{font-size:16px}@media(max-width:760px){.mini9-dimension-facts{grid-template-columns:1fr 1fr}}

.mini9-installation-space{max-width:860px;margin:28px auto!important}.mini9-installation-space img{width:100%;min-width:0}.mini9-installation-space figcaption{font-size:14px;line-height:1.8}

.performance-metric .performance-mode{font-size:clamp(36px,4vw,54px);line-height:1.6}

/* Contact: information and original QR at left, two-city map at right. */
.contact-reference-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,3fr);gap:48px;padding:56px 0;margin:24px 0;background:#f8f8f8;box-shadow:0 0 0 100vmax #f8f8f8;clip-path:inset(0 -100vmax)}
.contact-information h1{font-size:42px;font-weight:400;letter-spacing:0;margin:0 0 28px}.contact-lines{margin:0;color:var(--muted);font-size:16px}.contact-lines>div{display:flex;align-items:baseline;margin:10px 0;line-height:1.8}.contact-lines dt{display:flex;gap:12px;white-space:nowrap}.contact-lines dt span{width:20px;color:#888}.contact-lines dd{margin:0;overflow-wrap:anywhere}.contact-lines a:hover{text-decoration:underline;text-underline-offset:4px}.contact-wechat{margin:58px 0 0}.contact-wechat>img{object-fit:contain}.contact-wechat figcaption{font-size:13px;color:var(--muted);margin-top:10px}.contact-qr-crop{position:relative;overflow:hidden;width:208px;height:212px}.contact-qr-crop img{position:absolute;max-width:none;width:1958px;height:645px;left:-110px;top:-410px}.contact-location-map{margin:0;align-self:start}.contact-map-crop{position:relative;overflow:hidden;aspect-ratio:1030/543}.contact-map-crop img{position:absolute;max-width:none;width:190.0971%;height:auto;left:-79.3204%;top:-11.0497%}.contact-location-map figcaption{display:flex;flex-wrap:wrap;gap:12px 22px;margin-top:16px;font-size:13px;color:var(--muted)}.contact-location-map figcaption span{margin-right:auto}.contact-location-map figcaption a{text-decoration:underline;text-underline-offset:4px}
@media(max-width:1100px){.contact-reference-layout{gap:28px;grid-template-columns:1fr 1.2fr}.contact-lines{font-size:14px}.contact-information h1{font-size:36px}}
@media(max-width:760px){.contact-reference-layout{grid-template-columns:1fr;padding:32px 0;gap:32px}.contact-information h1{font-size:32px}.contact-lines{font-size:15px}.contact-wechat{margin-top:30px}.contact-location-map figcaption{font-size:12px}}

/* SKY400: horizontal enclosure and original controller screenshots. */
.sky-intro .product-showcase{background:#fff;border:1px solid var(--line)}
.sky-intro .product-showcase img{height:auto;aspect-ratio:4/3;object-fit:contain}
.sky-intro .showcase-performance dd{font-size:30px}
.sky-app-gallery .app-feature{display:flex;flex-direction:column}
.sky-app-gallery .app-feature-copy{flex:1}
.sky-panel-screen,.sky-phone-screen{display:block;width:100%;height:auto;margin:0 auto;border:1px solid var(--line);border-radius:8px}
.sky-panel-screen{max-width:360px}.sky-phone-screen{max-width:300px}
.sky-app-gallery .app-image-caption{text-align:center}

/* About: company identity and office contacts */
.company-identity{display:flex;justify-content:space-between;align-items:center;gap:32px;padding:28px 0 32px;border-top:1px solid var(--line)}
.company-brand{display:flex;align-items:center;gap:16px;margin:0 0 12px;font-size:15px}
.company-brand span{font-size:12px;letter-spacing:.12em;color:var(--muted)}
.company-identity h3{font-size:24px;line-height:1.5;margin:0}.company-website{white-space:nowrap}
.company-offices{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.company-office{background:var(--surface-soft);border-radius:8px;padding:32px;display:flex;flex-direction:column;align-items:flex-start}
.company-office h3{font-size:30px;margin:12px 0 16px}.company-office .eyebrow{margin:0;color:var(--muted)}
.office-address{font-size:16px;line-height:1.8;margin:0 0 28px}.office-contact{margin-top:auto;display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 20px}
.office-contact a{font-size:22px;font-variant-numeric:tabular-nums;display:inline-flex;align-items:center;min-height:44px}.office-contact span{font-size:13px;color:var(--muted)}
@media(max-width:760px){.company-identity{align-items:flex-start;flex-direction:column;gap:16px;padding:24px 0}.company-identity h3{font-size:21px}.company-offices{grid-template-columns:1fr;gap:16px}.company-office{padding:24px}.company-office h3{font-size:26px}.company-website{min-height:44px;display:inline-flex;align-items:center;gap:12px}.office-contact a{font-size:21px}}

/* Brand story: compact identity, readable chronology. */
.brand-story{max-width:1080px;margin:56px auto 72px}
.brand-story-heading{display:flex;align-items:center;justify-content:space-between;gap:32px;padding-bottom:30px;border-bottom:1px solid var(--line)}
.brand-story-heading h2{margin:8px 0 0;font-size:34px}.brand-story-heading img{width:145px;height:auto;object-fit:contain}
.brand-story-entry{display:grid;grid-template-columns:150px minmax(0,1fr);gap:40px;padding:30px 0;border-bottom:1px solid var(--line)}
.brand-story-marker{display:flex;flex-direction:column;gap:8px;padding-top:4px}.brand-story-marker span{font-size:26px;line-height:1.3;font-weight:500}.brand-story-marker small{font-size:13px;color:var(--muted)}
.brand-story-entry .prose{max-width:none;font-size:17px;line-height:1.95}.brand-story-entry .prose p{margin:0}
.brand-story-belief{background:var(--surface-soft);border:0;padding:28px 32px;margin-top:24px;border-radius:8px;grid-template-columns:118px minmax(0,1fr)}
.brand-story-belief .brand-story-marker span{font-size:18px}.brand-story-belief .prose{color:var(--ink)}
@media(max-width:760px){.brand-story{margin:32px 0 48px}.brand-story-heading{gap:20px;padding-bottom:24px}.brand-story-heading h2{font-size:27px}.brand-story-heading img{width:84px}.brand-story-entry{grid-template-columns:1fr;gap:14px;padding:24px 0}.brand-story-marker{flex-direction:row;align-items:baseline;gap:14px}.brand-story-marker span{font-size:24px}.brand-story-entry .prose{font-size:16px;line-height:1.9}.brand-story-belief{padding:24px;margin-top:20px}}