:root{--navy:#071d29;--ink:#16343f;--muted:#536a70;--paper:#f3f4f0;--line:#cbd5d1;--accent:#c4b48b;--white:#f5f5ed;--width:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.9 Arial,"DengXian","Microsoft YaHei","PingFang SC",sans-serif}a{color:inherit;text-decoration:none}button{font:inherit}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #b39350;outline-offset:5px}a,button{-webkit-tap-highlight-color:transparent}.wrap{width:min(var(--width),calc(100% - 100px));margin:auto}.micro{font-size:11px;letter-spacing:.16em;line-height:1.6}.label{color:#547267}.skip{position:fixed;top:-100px;left:16px;z-index:40;background:white;padding:12px}.skip:focus{top:12px}.header{position:absolute;z-index:10;top:0;width:100%;color:var(--white);border-bottom:1px solid #ffffff30}.header.solid{position:relative;background:var(--navy)}.nav{height:96px;display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:42px;height:42px;filter:brightness(0) invert(1)}.brand strong{font-size:22px;font-weight:400;line-height:1.4}.brand small{display:block;font-size:8px;letter-spacing:.2em;color:#c4d2cd}.links{display:flex;gap:30px;align-items:center;font-size:13px}.links a{padding:10px 0}.links a:hover{color:#dacba5}.links .entry{border-left:1px solid #ffffff45;padding-left:28px;color:#dfd3b5}.menu{display:none;color:white;border:1px solid #ffffff60;background:none;min-height:44px;padding:6px 14px}.hero{position:relative;isolation:isolate;min-height:780px;min-height:94svh;color:var(--white);background:var(--navy);overflow:hidden;display:flex;align-items:center}.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-3;animation:drift 28s ease-in-out infinite alternate}.hero:before{content:"";position:absolute;inset:0;z-index:-2;background:linear-gradient(90deg,#041923e6,#061b2475 58%,#081b2322),linear-gradient(0deg,#061921df,transparent 60%)}.hero-content{padding:155px 0 155px}.eyebrow{display:flex;gap:15px;align-items:center;color:#d1dcd4}.eyebrow:before{content:"";width:28px;height:1px;background:var(--accent)}h1{font-size:clamp(44px,4.8vw,70px);font-weight:300;line-height:1.42;letter-spacing:.045em;margin:30px 0 26px}.hero-copy{max-width:530px;font-size:16px;line-height:2;color:#d1dbd6}.actions{display:flex;align-items:center;gap:30px;flex-wrap:wrap;margin-top:34px}.btn{display:inline-flex;gap:40px;align-items:center;justify-content:space-between;padding:13px 22px;min-height:48px;background:#d3c49e;color:#102d37;border:1px solid #d3c49e;font-size:13px}.btn:hover{background:#e1d4b4}.text-link{display:inline-flex;gap:30px;align-items:center;min-height:44px;border-bottom:1px solid #b4a47e;padding-bottom:4px;font-size:13px}.text-link:hover{color:#84703d}.hero .text-link:hover{color:#e1d4b4}.hero-foot{position:absolute;bottom:30px;width:100%}.hero-foot .wrap{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;font-size:11px;color:#c3d2c9}.image-note{text-align:right;font-size:10px}.focus-strip{display:grid;grid-template-columns:1fr 1fr 1fr;gap:35px;border-bottom:1px solid var(--line);padding:28px 0}.focus-strip span{font-size:12px;color:var(--muted)}.focus-strip b{font-weight:400;display:block;font-size:16px;color:var(--ink)}.section{padding:95px 0;border-bottom:1px solid var(--line)}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:50px;margin-bottom:48px}h2{font-size:clamp(28px,3vw,40px);font-weight:300;line-height:1.6;letter-spacing:.02em;margin:12px 0 0}.section-head p{max-width:400px;font-size:14px;color:var(--muted);margin:0}.directions{display:grid;grid-template-columns:.9fr 1.1fr;gap:80px}.visual{position:relative;margin:0;min-height:495px;overflow:hidden;background:var(--navy)}.visual img{position:absolute;width:100%;height:100%;object-fit:cover;object-position:75% center}.visual:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,#061b23e6,transparent 65%)}.visual figcaption{position:absolute;z-index:1;bottom:25px;left:25px;color:#e1e5db;font-size:11px}.direction{border-top:1px solid var(--line);padding:23px 0;display:grid;grid-template-columns:35px 1fr;gap:15px}.direction:first-child{border-top:0;padding-top:0}.number{color:#637d70;font:italic 20px Georgia,serif}.direction h3{font-size:23px;font-weight:400;margin:0 0 9px}.direction p{margin:0 0 10px;font-size:14px;color:var(--muted)}.direction a{font-size:12px;min-height:44px;display:inline-flex;align-items:center;gap:18px}.direction a:hover{text-decoration:underline}.note{font-size:12px;color:var(--muted);border-left:2px solid var(--accent);padding-left:18px;margin:28px 0 0}.dark{background:var(--navy);color:var(--white);padding:95px 0}.split{display:grid;grid-template-columns:.7fr 1.3fr;gap:90px}.dark .label{color:#b2c5bb}.dark h2{margin-top:0}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;border-top:1px solid #ffffff40;padding-top:27px;margin-top:32px}.principles h3{font-size:17px;font-weight:400;margin:0 0 12px}.principles p{font-size:13px;color:#b7c9c1;margin:0}.brief-panel{display:grid;grid-template-columns:1fr 1fr;gap:65px;margin-top:45px}.brief-panel h3{font-size:20px;font-weight:400;margin:0 0 18px}.brief-list{list-style:none;padding:0;margin:0}.brief-list li{border-top:1px solid var(--line);padding:16px 0;display:flex;gap:22px;font-size:14px}.brief-list b{font-weight:400;color:var(--muted);min-width:80px}.brief-box{background:#e8ece5;padding:35px}.brief-box p{font-size:14px;color:var(--muted)}.brief-box .text-link{margin-top:12px}.faq{margin-top:48px}.faq details{border-top:1px solid var(--line);padding:0}.faq summary{cursor:pointer;padding:20px 0;min-height:60px;list-style:none;display:flex;justify-content:space-between;gap:30px;font-size:15px}.faq summary:after{content:"+";font-size:20px}.faq details[open] summary:after{content:"−"}.faq details p{font-size:14px;color:var(--muted);max-width:780px;margin:0 0 24px}.about p{font-size:15px;color:var(--muted);margin:0 0 22px}.about h2{font-size:30px;margin:0 0 25px}.about .wordmark{font-size:28px;font-family:Georgia,serif;margin-top:24px;color:#5d7869}.employee{margin:0 0 70px;padding:28px 0;display:flex;align-items:center;justify-content:space-between;gap:30px;border-bottom:1px solid var(--line)}.employee-title{display:flex;align-items:center;gap:20px}.employee-title img{width:42px;height:42px}.employee h2{font-size:18px;margin:0}.employee p{font-size:12px;color:var(--muted);margin:3px 0 0}.footer{background:#e5eae2;padding:35px 0;color:#496458;font-size:12px}.footer-top,.footer-bottom{display:flex;gap:25px;justify-content:space-between;flex-wrap:wrap}.footer-bottom{border-top:1px solid #c5d1c6;padding-top:20px;margin-top:24px;font-size:11px}.footer a:hover{text-decoration:underline}.page-heading{padding:75px 0 55px}.page-heading h1{color:var(--ink);font-size:49px;margin:16px 0 24px}.page-heading p{max-width:730px;color:var(--muted)}.topic{padding:55px 0;display:grid;grid-template-columns:.7fr 1.3fr;gap:90px;border-top:1px solid var(--line)}.topic h2{font-size:29px;margin:0 0 20px}.topic h3{font-size:17px;font-weight:500;margin:25px 0 10px}.topic p,.topic li{font-size:14px;color:var(--muted)}.topic ul{padding-left:20px}.status{display:inline-block;background:#e3e9df;color:#405f4d;font-size:12px;padding:4px 10px}.login-panel{max-width:760px;margin:0 auto 85px;padding:45px;background:#e7ece5;border-top:2px solid #9a8b65}.login-panel h2{font-size:27px;margin:0 0 20px}.login-panel p{color:var(--muted);font-size:14px}.login-panel ol{padding-left:22px;font-size:14px}.muted{color:var(--muted)}@keyframes drift{to{transform:scale(1.045)}}
@media(max-width:1050px){.wrap{width:calc(100% - 56px)}.links{gap:20px}.directions{gap:40px}.split,.topic{gap:45px}.hero h1{font-size:58px}}
@media(max-width:720px){.wrap{width:calc(100% - 40px)}.nav{height:80px;gap:12px}.brand img{width:33px;height:33px}.brand strong{font-size:18px}.brand small{font-size:7px}.menu{display:block;font-size:12px}.links{display:none;position:absolute;top:80px;left:0;right:0;background:var(--navy);padding:20px;flex-direction:column;align-items:stretch;gap:6px;border-bottom:1px solid #ffffff40}.links.open{display:flex}.links a{padding:11px 5px;min-height:44px}.links .entry{padding-left:5px;border-left:0;border-top:1px solid #ffffff30;margin-top:6px;padding-top:18px}.hero{min-height:760px;min-height:96svh}.hero h1{font-size:44px;line-height:1.5;letter-spacing:.025em}.hero-content{padding:140px 0 160px}.hero-copy{font-size:14px;max-width:330px}.hero-image{object-position:65% center}.hero-foot{bottom:24px}.hero-foot .wrap{font-size:10px}.hero-foot .image-note{max-width:135px}.actions{gap:22px}.focus-strip{grid-template-columns:1fr;gap:15px;padding:25px 0}.focus-strip span{display:flex;justify-content:space-between;align-items:center;gap:18px}.focus-strip b{font-size:14px}.section{padding:64px 0}.section-head{display:block;margin-bottom:32px}.section-head p{margin-top:22px}.directions,.split,.topic,.brief-panel{grid-template-columns:1fr;gap:32px}.visual{min-height:280px}.direction{padding:24px 0}.direction h3{font-size:21px}.dark{padding:65px 0}.principles{grid-template-columns:1fr;gap:24px}.brief-panel{margin-top:30px}.brief-box{padding:25px}.brief-list li{display:block}.brief-list b{display:block;margin-bottom:4px}.employee{align-items:flex-start;flex-direction:column;gap:15px;margin-bottom:45px}.employee-title{gap:15px}.footer-top,.footer-bottom{flex-direction:column;gap:12px}.page-heading{padding:55px 0 35px}.page-heading h1{font-size:37px}.topic{padding:40px 0}.login-panel{padding:28px 23px;margin-bottom:50px}.about h2{font-size:26px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}

.header{background:#071d296b}.header.solid{background:var(--navy)}@media(max-width:720px){.hero h1{font-size:clamp(28px,8vw,44px)}.menu{white-space:nowrap;flex-shrink:0}.brand strong{white-space:nowrap}}@media(max-width:360px){.brand strong{font-size:16px}.brand img{width:27px;height:27px}.brand{gap:8px}.brand small{font-size:6px}.menu{padding:6px 9px}.hero .micro{font-size:9px}.hero-foot .micro{font-size:8px}.page-heading h1{font-size:30px}}
/* Keep the existing white header mark and silver employee mark. */
.sail-mark{position:relative;display:inline-block;flex:0 0 42px;width:42px;height:42px;isolation:isolate}
.sail-mark img{position:absolute;inset:0;width:100%!important;height:100%!important;object-fit:contain}
.sail-mark .sail-body{clip-path:inset(0 0 21% 0)}
.sail-mark .sail-wave{clip-path:inset(79% 0 0 0);transform-origin:50% 82%;animation:logo-wave 5.5s ease-in-out infinite;will-change:transform}
.sail-mark:after{content:"";position:absolute;inset:0;pointer-events:none;clip-path:inset(79% 0 0 0);background:linear-gradient(112deg,transparent 34%,#f5fbffbd 47%,#fff 50%,transparent 62%);background-size:330% 100%;background-position:170% 0;-webkit-mask:url(os-logo.png) center/contain no-repeat;mask:url(os-logo.png) center/contain no-repeat;mix-blend-mode:screen;opacity:.5;animation:logo-glint 8s ease-in-out infinite,logo-wave 5.5s ease-in-out infinite;transform-origin:50% 82%}
@keyframes logo-wave{0%,100%{transform:translateY(0) scaleX(1)}25%{transform:translateY(-.8px) scaleX(1.018)}60%{transform:translateY(.75px) scaleX(.985)}85%{transform:translateY(-.3px) scaleX(1.006)}}
@keyframes logo-glint{0%,18%{background-position:170% 0;opacity:.1}45%{opacity:.65}75%,100%{background-position:-65% 0;opacity:.1}}
.hero-image{animation:ocean-fallback-drift 22s ease-in-out infinite alternate}
.ocean-surface{position:absolute;inset:0;width:100%;height:100%;z-index:-3;pointer-events:none;opacity:0}
.hero.ocean-ready .ocean-surface{opacity:1}
.hero.ocean-ready .hero-image{animation:none;opacity:0}
.motion-toggle{border:1px solid #ccd9d052;background:#071d2944;color:#dce6df;padding:9px 13px;min-height:44px;font-size:11px;letter-spacing:.06em;cursor:pointer;white-space:nowrap;flex-shrink:0}
.motion-toggle:hover{background:#071d2980;border-color:#c4b48b}
.motion-toggle[hidden]{display:none}
.motion-paused .sail-wave,.motion-paused .sail-mark:after,.motion-paused .hero-image{animation-play-state:paused!important}
@keyframes ocean-fallback-drift{0%{transform:scale(1.02) translateX(-.2%)}100%{transform:scale(1.07) translateX(.3%)}}
@media(max-width:720px){.sail-mark{width:33px;height:33px;flex-basis:33px}.employee-title .sail-mark{width:42px;height:42px;flex-basis:42px}.motion-toggle{font-size:10px;padding:8px 11px}}
@media(max-width:360px){.brand .sail-mark{width:27px;height:27px;flex-basis:27px}}
@media(prefers-reduced-motion:reduce){.sail-mark .sail-wave,.sail-mark:after,.hero-image{animation:none!important}.hero.ocean-ready .hero-image{opacity:1}.hero.ocean-ready .ocean-surface{opacity:0}.motion-toggle{display:none}}

/* Continuous local deformation: the sail never moves. */
.sail-mark.ribbon-ready .sail-wave,.sail-mark.ribbon-ready:after{visibility:hidden;animation:none}
.sail-ribbon{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.brand .sail-ribbon{filter:brightness(0) invert(1)}
@media(prefers-reduced-motion:reduce){.sail-mark.ribbon-ready .sail-wave{visibility:visible;animation:none}.sail-ribbon{visibility:hidden}}

/* The canvas now carries both sails and the complete lower ribbon. */
.sail-mark.ribbon-ready .sail-body{visibility:hidden}
@media(prefers-reduced-motion:reduce){.sail-mark.ribbon-ready .sail-body{visibility:visible}}

/* Business contact, approved for publication on 2026-10-17. */
.contact-email{display:grid;gap:16px;margin:28px 0 22px;padding-top:24px;border-top:1px solid rgba(255,255,255,.18)}
.business-email{font-size:clamp(18px,2.2vw,26px);font-weight:500;letter-spacing:-.025em;overflow-wrap:anywhere;text-underline-offset:5px}
.footer-top{flex-wrap:wrap;gap:20px 30px}.footer-email{overflow-wrap:anywhere}

/* v10 bilingual navigation and laboratory editorial */
.lang-switch{display:inline-flex;align-items:center;justify-content:center;min-width:42px;padding:7px 10px;border:1px solid #ffffff55;border-radius:2px;color:var(--white);font-size:12px;letter-spacing:.06em;white-space:nowrap}.header.solid .lang-switch{border-color:#ffffff45}.lab-chapter{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(34px,6vw,86px);align-items:center;padding:58px 0;border-top:1px solid var(--line)}.lab-figure{margin:0;min-width:0}.lab-figure img,.lab-preview>img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;filter:saturate(.78) contrast(.98)}.lab-figure img.wave-maker{aspect-ratio:11/10;object-fit:contain;background:var(--night)}.lab-figure figcaption{padding-top:12px;color:var(--muted);font-size:11px;line-height:1.7;letter-spacing:.04em}.lab-copy h2,.lab-preview h2{margin:12px 0 18px;font-size:clamp(28px,3vw,40px);line-height:1.3}.lab-copy h3{margin:24px 0 8px;font-size:16px}.lab-copy p,.lab-preview p{line-height:1.9}.lab-preview{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(30px,6vw,80px);align-items:center;margin:30px 0 60px;padding:30px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}body:lang(en) .page-heading h1,body:lang(en) .section-head h2{letter-spacing:-.035em}body:lang(en) .hero h1{letter-spacing:-.025em;line-height:1.2}@media(max-width:720px){.lang-switch{margin-left:auto;min-width:38px;padding:6px 7px}.nav{gap:9px}.brand{gap:9px}.brand small{display:none}.lab-chapter,.lab-preview{grid-template-columns:1fr;gap:22px;padding:36px 0}.lab-figure img,.lab-preview>img{aspect-ratio:4/3}.lab-figure img.wave-maker{aspect-ratio:11/10;object-fit:contain}.lab-copy h2,.lab-preview h2{font-size:28px}}@media(max-width:360px){.lang-switch{min-width:34px;padding:5px}.brand strong{font-size:15px}.nav{gap:6px}}

/* v11 gated OS employee entry */
.os-entry-button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;margin:14px 0;padding:0 20px;border:1px solid var(--line);color:var(--muted);text-decoration:none;letter-spacing:.02em}.os-entry-button[aria-disabled="true"]{cursor:not-allowed;opacity:.66}.os-entry-button[data-ready="true"]{background:var(--white);border-color:var(--white);color:var(--navy)}.os-entry-note{font-size:13px;color:var(--muted)}

/* v12 concise engineering presentation */
.hero{min-height:720px;min-height:88svh}.hero h1{font-size:clamp(38px,4.8vw,68px);letter-spacing:.01em;line-height:1.42;max-width:1000px}.hero-copy{font-size:18px}.hero-content{padding:150px 0}.section{padding:78px 0}.section-head h2{font-size:clamp(28px,3vw,39px);line-height:1.45}.lab-chapter{padding:48px 0;gap:64px}.lab-chapter:nth-of-type(even) .lab-figure{order:2}.lab-copy p{font-size:16px;line-height:1.9;max-width:540px}.lab-figure img{aspect-ratio:3/2;object-fit:cover;filter:saturate(.84)}.lab-figure figcaption{font-size:11px;color:var(--muted)}.spec-list{margin:28px 0 0}.spec-list>div{padding:15px 0;border-top:1px solid var(--line)}.spec-list dt{font-size:14px;font-weight:600}.spec-list dd{margin:5px 0 0;font-size:14px;color:var(--muted);line-height:1.8}.topic p{font-size:16px;max-width:620px}.contact-band{padding:62px 0;display:flex;justify-content:space-between;align-items:center;gap:40px;border-top:1px solid var(--line)}.contact-band h2{margin-top:8px}.contact-band p{color:var(--muted)}.contact-band .business-email{font-size:clamp(18px,2.3vw,28px)}.media-note{font-size:12px;color:var(--muted);margin:20px 0 40px}.employee{margin-bottom:35px}.login-panel{margin-left:0}.page-heading p{font-size:18px}.page-heading h1{line-height:1.35}.footer{background:#e6eae6}.label{color:#60756f}body:lang(en) .hero h1{font-size:clamp(34px,4.3vw,62px)}
@media(max-width:720px){.hero{min-height:700px;min-height:88svh}.hero h1{font-size:clamp(28px,7.9vw,43px)}.hero-copy{font-size:15px}.hero-content{padding:138px 0}.section{padding:52px 0}.lab-chapter{gap:24px;padding:34px 0}.lab-chapter:nth-of-type(even) .lab-figure{order:0}.lab-copy p{font-size:15px}.contact-band{padding:44px 0;display:block}.contact-band .business-email{display:inline-block;margin-top:15px}.page-heading p{font-size:16px}.topic p{font-size:15px}.hero-foot .wrap{font-size:9px}body:lang(en) .hero h1{font-size:34px}}

/* v13: clearer water while keeping the title readable. */
.hero:before{background:linear-gradient(90deg,#041923d9,#061b2459 58%,#081b2314),linear-gradient(0deg,#061921bd,transparent 60%)}