:root{--ink:#151515;--muted:#626262;--line:#dedede;--soft:#f4f4f3}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:#fff;color:var(--ink);font-family:Arial,Helvetica,"Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block;height:auto}figure{margin:0}a:focus-visible,summary:focus-visible{outline:2px solid #222;outline-offset:6px}p{line-height:1.65}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:700}h1{letter-spacing:-.055em;line-height:1.03}h2{font-size:clamp(28px,3.5vw,48px);letter-spacing:-.04em;line-height:1.1}h3{letter-spacing:-.025em;line-height:1.25}.wrap{width:calc(100% - 96px);max-width:1440px;margin-inline:auto}.preview{min-height:31px;padding:7px 48px;background:#f1f1f1;font-size:11px;letter-spacing:.08em;display:flex;justify-content:space-between;gap:15px;color:#555}.preview span{letter-spacing:.02em}.header{height:106px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.wordmark{font-size:42px;font-weight:900;letter-spacing:-2.5px;line-height:1}nav{display:flex;gap:36px;font-size:14px}nav a{padding-block:10px}nav a:hover,.quiet-link:hover{text-decoration:underline;text-underline-offset:6px}nav a[aria-current=page]{font-weight:700}.skip{position:absolute;left:20px;top:-100px;padding:15px;background:#fff;z-index:20}.skip:focus{top:10px}.eyebrow{font-size:12px;letter-spacing:.13em;font-weight:700;line-height:1.5}.intro{padding-block:58px 52px}.intro-row{display:flex;justify-content:space-between;align-items:end;gap:40px}.intro h1{font-size:clamp(54px,5.8vw,84px);margin:4px 0 0}.intro-note{max-width:330px;font-size:16px;color:var(--muted);margin-bottom:6px}.section-line{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-bottom:24px}.section-line h2{font-size:23px;letter-spacing:-.025em;margin:0}.section-line>span{font-size:12px;letter-spacing:.08em;color:var(--muted)}.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.product-image{position:relative;background:var(--soft);overflow:hidden}.product-image img{width:100%;aspect-ratio:1;object-fit:contain;transition:transform .3s ease}.product-card:hover img{transform:scale(1.015)}.index{position:absolute;top:20px;left:22px;font-size:12px;color:#777}.card-line{display:flex;align-items:baseline;justify-content:space-between;gap:15px;margin-top:22px}.card-line h3{font-size:23px;margin:0}.arrow{font-size:25px}.product-card>p{font-size:15px;color:var(--muted);margin:9px 0 0}.research-feature{margin-top:110px;display:grid;grid-template-columns:1.2fr 1fr;gap:8%;align-items:center;padding-top:40px;border-top:1px solid var(--line)}.research-picture{overflow:hidden;background:var(--soft)}.research-picture img{width:100%;aspect-ratio:1;object-fit:contain}.research-copy h2{font-size:clamp(40px,4.8vw,68px);margin:25px 0}.research-copy>p:not(.eyebrow){color:var(--muted)}.text-link{display:inline-flex;align-items:center;gap:25px;border-bottom:1px solid #222;padding-bottom:7px;font-size:14px;margin-top:20px}.text-link:hover{opacity:.6}.small-note{font-size:13px;color:var(--muted);line-height:1.6;margin-top:24px}.questions{padding-block:100px}.quiet-link{font-size:13px}.question-row{display:grid;grid-template-columns:240px 1fr 20px;align-items:center;gap:20px;padding:31px 0;border-top:1px solid var(--line)}.question-row:last-child{border-bottom:1px solid var(--line)}.question-row>span{font-size:11px;letter-spacing:.07em;color:var(--muted)}.question-row h3{font-size:22px;margin:0}.question-row b{font-size:20px;font-weight:400}.question-row:hover h3{text-decoration:underline;text-underline-offset:5px}.about-line{padding-bottom:95px}.about-line>div{display:grid;grid-template-columns:1fr 1fr;gap:60px;margin-top:28px}.about-line h2{font-size:56px}.about-line p:not(.eyebrow){max-width:490px;color:var(--muted)}.footer{border-top:1px solid var(--line);padding-block:40px 50px;display:grid;grid-template-columns:1fr 1.5fr 1fr auto;gap:30px;align-items:start}.footer-logo{font-size:32px}.footer p{font-size:13px;color:var(--muted);margin:0}.footer>div{display:flex;gap:25px;font-size:13px}.footer small{font-size:11px;color:var(--muted)}.page-intro{padding:75px 0 70px}.page-intro h1{font-size:clamp(50px,6vw,82px);margin:30px 0}.lead{font-size:18px;color:var(--muted);line-height:1.7;max-width:640px}.status-note{display:inline-block;font-size:12px;padding:10px 14px;border:1px solid var(--line);margin-top:12px;color:var(--muted)}.research-topic{border-top:1px solid var(--line);padding-block:60px;display:grid;grid-template-columns:1fr 1fr;gap:10%;align-items:center}.research-topic h2{margin:28px 0}.research-topic p{max-width:490px;color:var(--muted);font-size:16px}.research-topic .small-note{font-size:13px}.research-topic img{width:100%;aspect-ratio:1;object-fit:contain}.research-topic figcaption{font-size:12px;color:var(--muted);margin-top:12px;line-height:1.5}.research-topic:last-child{padding-bottom:95px}.about-body{display:grid;grid-template-columns:1fr 2fr;gap:60px;border-top:1px solid var(--line);padding-block:55px 70px}.about-body>div{max-width:670px}.about-body p:not(.eyebrow){font-size:18px;color:var(--muted)}.about-body p.large-copy{font-size:32px;color:var(--ink);font-weight:700;line-height:1.25;letter-spacing:-.025em}.about-body h2{font-size:36px}.breadcrumb{display:flex;gap:14px;font-size:12px;color:var(--muted);padding-block:30px}.breadcrumb a{text-decoration:underline;text-underline-offset:4px}.product-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:7%;align-items:center;padding-bottom:55px}.detail-image img{width:100%}.product-summary h1{font-size:clamp(38px,4.4vw,64px);margin:25px 0}.product-summary .lead{font-size:17px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:40px;background:#171717;color:white;padding:18px 22px;font-size:14px;margin-top:15px}.button:hover{background:#3b3b3b}.section-nav{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-block:12px;gap:38px}.detail-section{padding-block:55px}.detail-section .section-line h2{font-size:36px}.two-up{display:grid;grid-template-columns:1fr 1fr;gap:25px}.two-up img{width:100%}.section-copy{padding:60px 40px;align-self:center}.section-copy h3{font-size:32px}.section-copy p:not(.eyebrow){font-size:16px;color:var(--muted)}.spec-section{border-block:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:70px;padding-block:55px}.spec-section h2{font-size:36px}dl{margin:0}dl>div{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:18px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.6}dl>div:first-child{padding-top:0}dl>div:last-child{border-bottom:0}dt{color:var(--muted)}dd{margin:0}.faq details{border-top:1px solid var(--line)}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{display:flex;align-items:center;justify-content:space-between;gap:20px;list-style:none;cursor:pointer;padding:25px 0;font-size:17px;font-weight:700}.faq summary::-webkit-details-marker{display:none}.faq summary span{font-size:25px;font-weight:400}.faq details[open] summary span{transform:rotate(45deg)}.faq details>p{max-width:820px;font-size:16px;color:var(--muted);margin:0 45px 28px 0}.related{padding-block:30px 85px}.related h2{font-size:34px;margin-bottom:0}
@media(min-width:1550px){.wrap{width:calc(100% - 160px)}}
@media(max-width:850px){.wrap{width:calc(100% - 48px)}.preview{padding-inline:24px}.header{height:90px}.wordmark{font-size:36px}.intro-row{display:block}.intro-note{margin-top:24px}.intro{padding-top:42px}.intro h1{font-size:62px}.research-feature{gap:5%}.question-row{grid-template-columns:180px 1fr 20px}.footer{grid-template-columns:1fr 1fr}.product-hero{gap:5%}.product-summary h1{font-size:40px}.section-copy{padding:20px}.spec-section{gap:30px}.about-body{gap:30px}.research-topic{gap:5%}}
@media(max-width:600px){.wrap{width:calc(100% - 36px)}.preview{padding-inline:18px;font-size:10px}.preview span{font-size:10px}.header{height:83px}.wordmark{font-size:34px}nav{gap:22px;font-size:13px}.intro{padding-block:37px 38px}.intro h1{font-size:50px;letter-spacing:-.05em}.intro-note{font-size:15px;margin-top:20px}.eyebrow{font-size:11px}.section-line h2{font-size:20px}.product-grid{grid-template-columns:1fr;gap:35px}.card-line h3{font-size:22px}.product-card>p{font-size:14px}.research-feature{margin-top:65px;padding-top:30px;grid-template-columns:1fr;gap:34px}.research-copy h2{font-size:47px;margin-block:18px}.research-copy>p{font-size:16px}.questions{padding-block:60px}.section-line{align-items:baseline}.quiet-link{font-size:12px;white-space:nowrap}.question-row{grid-template-columns:1fr 20px;gap:10px;padding:24px 0}.question-row>span{grid-column:1/-1}.question-row h3{font-size:20px}.about-line{padding-bottom:55px}.about-line>div{grid-template-columns:1fr;gap:5px}.about-line h2{font-size:44px;margin-bottom:16px}.about-line p:not(.eyebrow){font-size:16px}.footer{padding-block:30px 35px;gap:26px}.footer>div{flex-wrap:wrap;gap:18px}.footer small{align-self:end}.page-intro{padding-block:43px 40px}.page-intro h1{font-size:47px;margin-block:24px}.lead{font-size:16px}.research-topic{grid-template-columns:1fr;gap:35px;padding-block:40px}.research-topic h2{font-size:38px}.research-topic p{font-size:16px}.about-body{grid-template-columns:1fr;gap:10px;padding-block:35px}.about-body p:not(.eyebrow){font-size:16px}.about-body p.large-copy{font-size:28px}.breadcrumb{padding-block:22px;font-size:11px;gap:10px}.product-hero{grid-template-columns:1fr;gap:30px;padding-bottom:35px}.product-summary h1{font-size:43px;max-width:330px;margin-block:18px}.section-nav{font-size:12px;gap:22px;justify-content:space-between}.detail-section{padding-block:38px}.detail-section .section-line h2{font-size:28px}.two-up{grid-template-columns:1fr;gap:18px}.section-copy{padding:22px 0}.spec-section{grid-template-columns:1fr;gap:20px;padding-block:35px}.spec-section h2{font-size:29px;margin-bottom:10px}.spec-section .small-note{margin-top:12px}dl>div{font-size:14px}.faq summary{font-size:16px;padding-block:22px}.faq details>p{font-size:15px}.related{padding-bottom:50px}.related h2{font-size:28px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.product-image img{transition:none}}

/* Built-in language selection and Chinese typography. */
.header-tools{display:flex;align-items:center;gap:36px}
.language-switch{display:flex;align-items:center;gap:4px;white-space:nowrap;font-size:12px}
.language-switch[hidden]{display:none}
.language-switch>span{color:#aaa;font-size:11px}
.language-switch button{appearance:none;border:0;background:transparent;color:#777;font:inherit;min-width:40px;min-height:44px;padding:10px 7px;cursor:pointer}
.language-switch button[aria-pressed="true"]{color:var(--ink);font-weight:700;text-decoration:underline;text-underline-offset:6px}
.language-switch button:focus-visible{outline:2px solid #222;outline-offset:2px}
.language-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.faq summary [data-en]{font:inherit;transform:none}
.faq details[open] summary [data-en]{transform:none}
html:lang(zh) h1,html:lang(zh) h2,html:lang(zh) h3{letter-spacing:-.025em;line-height:1.22}
html:lang(zh) .intro-note,html:lang(zh) .lead{line-height:1.85}
html:lang(zh) .eyebrow{letter-spacing:.1em}
html:lang(zh) .about-body p.large-copy{letter-spacing:0;line-height:1.5}
@media(max-width:850px){.header-tools{gap:20px}}
@media(max-width:600px){
 .header{height:auto;min-height:105px;flex-wrap:wrap;gap:12px;padding-block:18px 12px}
 .header-tools{display:contents}
 .header-tools>nav{order:3;width:100%;justify-content:flex-start;gap:28px;font-size:13px}
 .header-tools>nav a{padding-block:3px}
 .language-switch{margin-left:auto}
 html:lang(zh) .intro h1{font-size:46px}
 html:lang(zh) .page-intro h1{font-size:40px}
 html:lang(zh) .product-summary h1{font-size:38px}
 html:lang(zh) .research-copy h2{font-size:42px}
 html:lang(zh) .section-line h2{font-size:19px}
 html:lang(zh) .detail-section .section-line h2{font-size:27px}
}

/* Public contact address: keep the full address readable on narrow screens. */
.footer>div{flex-wrap:wrap;row-gap:12px}
.footer-contact{flex-basis:100%;min-width:0;overflow-wrap:anywhere;line-height:1.7}
.footer-contact:hover{text-decoration:underline;text-underline-offset:4px}
.contact-email{max-width:100%;overflow-wrap:anywhere;display:inline-block;font-size:18px}