/* Yan & Partners Engineering — brand: black / white / teal #00CCCC (Pantone 3252 U)
   Type: Poppins (Latin) + Noto Sans TC (中文) */
:root{
  --teal:#00cccc; --bg:#0e0e0e; --bg-2:#151515; --bg-3:#1c1c1c;
  --fg:#ffffff; --fg-2:#bdbdbd; --fg-3:#8a8a8a; --line:rgba(255,255,255,.1);
  --gut:clamp(16px,5.3vw,80px); --hdr:90px;
  --f:"Poppins","Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;
  --ease:cubic-bezier(.19,1,.22,1);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--f);font-weight:300;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
html[lang="zh-Hant"] body{font-weight:400;letter-spacing:.03em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--teal);color:#000}
h1,h2,h3{font-weight:400;margin:0;line-height:1.14;letter-spacing:-.01em}
html[lang="zh-Hant"] h1,html[lang="zh-Hant"] h2{letter-spacing:.02em;line-height:1.3}
p{margin:0 0 1.1em}
.label{font-size:15px;font-weight:500;color:#fff;margin:0 0 22px;display:block}
.label.t{color:var(--teal)}
.muted{color:var(--fg-3)}
.ul{border-bottom:1px solid rgba(255,255,255,.35);transition:border-color .3s,color .3s}
.ul:hover{color:var(--teal);border-color:var(--teal)}

/* loader */
.loader{position:fixed;inset:0;z-index:200;background:var(--bg);display:flex;align-items:center;justify-content:center;transition:opacity .8s var(--ease),visibility .8s}
.loader img{width:56px;height:56px;animation:pulse 1.4s ease-in-out infinite}
.loaded .loader{opacity:0;visibility:hidden}
@keyframes pulse{50%{transform:scale(.82);opacity:.6}}

/* header */
.hdr{position:fixed;inset:0 0 auto;height:var(--hdr);z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 var(--gut);pointer-events:none}
.hdr>*{pointer-events:auto}
.hdr .logo img{height:26px;width:auto}
.hdr .right{display:flex;align-items:center;gap:26px}
.lang{font-size:13px;font-weight:500;display:flex;gap:12px}
.lang a{color:var(--fg-3);transition:color .3s}.lang a.on,.lang a:hover{color:#fff}
.menu-btn{width:42px;height:42px;border-radius:50%;border:1.5px solid #fff;background:transparent;position:relative;cursor:pointer;padding:0;transition:transform .5s var(--ease),border-color .3s}
.menu-btn::after{content:"";position:absolute;left:50%;top:50%;width:4px;height:4px;margin:-2px 0 0 -2px;border-radius:50%;background:#fff;transition:transform .5s var(--ease),background .3s}
.menu-btn:hover::after{transform:scale(3.4)}
.menu-btn:hover{border-color:var(--teal)}.menu-btn:hover::after{background:var(--teal)}
.menu-open .menu-btn::after{transform:scale(6);background:#fff}
.hdr::before{content:"";position:absolute;inset:0 0 -30px;background:linear-gradient(180deg,rgba(14,14,14,.96) 55%,rgba(14,14,14,0));opacity:0;transition:opacity .4s;z-index:-1;pointer-events:none}
.scrolled .hdr::before{opacity:1}

/* fullscreen menu */
.nav{position:fixed;inset:0;z-index:90;background:var(--bg);display:flex;align-items:center;justify-content:center;flex-direction:column;clip-path:circle(0 at calc(100% - var(--gut) - 21px) 45px);transition:clip-path .9s var(--ease);visibility:hidden}
.menu-open .nav{clip-path:circle(150% at calc(100% - var(--gut) - 21px) 45px);visibility:visible}
.nav ul{list-style:none;margin:0;padding:0 var(--gut);display:flex;flex-wrap:nowrap;justify-content:center;align-items:baseline;gap:0;white-space:nowrap}
.nav li{font-size:clamp(28px,3.55vw,64px);line-height:1.2;display:flex;align-items:baseline;font-weight:300}
.nav li+li::before{content:"/";color:rgba(255,255,255,.28);margin:0 .38em;font-weight:200}
@media(max-width:900px){
  .nav{align-items:flex-start}
  .nav ul{flex-direction:column;align-items:flex-start;gap:6px}
  .nav li{font-size:clamp(34px,9vw,54px)}
  .nav li+li::before{display:none}
}
.nav a{display:inline-block;overflow:hidden;position:relative;color:var(--fg-3);transition:color .4s}
.nav a span{display:block;transition:transform .6s var(--ease)}
.nav a span+span{position:absolute;left:0;top:100%;color:#fff}
.nav a:hover span{transform:translateY(-100%)}
.nav a.on{color:#fff}
.nav li{opacity:0;transform:translateY(40px);transition:opacity .6s,transform .8s var(--ease)}
.menu-open .nav li{opacity:1;transform:none}
.menu-open .nav li:nth-child(2){transition-delay:.06s}.menu-open .nav li:nth-child(3){transition-delay:.12s}.menu-open .nav li:nth-child(4){transition-delay:.18s}.menu-open .nav li:nth-child(5){transition-delay:.24s}
.nav .meta{position:absolute;bottom:40px;left:var(--gut);right:var(--gut);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:13px;color:var(--fg-3)}
.nav .meta a:hover{color:var(--teal)}

/* footer bar (fixed like current site) */
.bar{position:fixed;left:0;right:0;bottom:0;height:64px;z-index:80;display:flex;align-items:center;justify-content:flex-end;gap:26px;padding:0 var(--gut);font-size:12px;font-weight:500;pointer-events:none}
.bar>*{pointer-events:auto}
.bar::before{content:"";position:absolute;inset:-20px 0 0 50%;background:linear-gradient(0deg,rgba(14,14,14,.96) 55%,rgba(14,14,14,0));z-index:-1}
.bar .lang{font-size:12px}
@media(max-width:900px){.bar{display:none}}

/* split layout */
.split{display:grid;grid-template-columns:1fr 1fr;min-height:100vh}
.media{position:sticky;top:0;height:100vh;overflow:hidden;background:#000}
.media figure{position:absolute;inset:0;margin:0;opacity:0;transition:opacity 1.2s var(--ease)}
.media figure.on{opacity:1}
.media img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);transition:transform 7s linear}
.media figure.on img{transform:scale(1)}
.media figure::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(0,0,0,.65),transparent 40%),linear-gradient(180deg,rgba(0,0,0,.45),transparent 25%)}
.media figcaption{position:absolute;left:var(--gut);right:40px;bottom:90px;z-index:2;font-size:17px;font-weight:400;line-height:1.4}
.media figcaption small{display:block;font-size:13px;color:var(--fg-2);font-weight:300;margin-top:4px}
.content{min-width:0}
.panel{min-height:100vh;padding:calc(var(--hdr) + 40px) var(--gut) 120px clamp(24px,5.3vw,80px);display:flex;flex-direction:column;justify-content:center;border-bottom:1px solid var(--line)}
.panel .inline-media{display:none}
@media(max-width:900px){
  .split{grid-template-columns:1fr}
  .media{display:none}
  .panel{min-height:0;padding:72px var(--gut)}
  .panel .inline-media{display:block;margin:0 calc(var(--gut)*-1) 36px;aspect-ratio:4/3;overflow:hidden}
  .panel .inline-media img{width:100%;height:100%;object-fit:cover}
  .panel.hero{padding-top:calc(var(--hdr) + 20px)}
  .hdr{background:var(--bg);height:72px}:root{--hdr:72px}
  .panel .inline-media{margin-top:-20px}
}

/* hero */
.hero .typed{font-size:15px;font-weight:500;min-height:1.6em;margin-bottom:26px}
.hero .typed b{font-weight:500}
.hero .typed i{display:inline-block;width:1.5px;height:1.05em;background:var(--teal);vertical-align:-2px;margin-left:3px;animation:blink .8s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.hero h1{font-size:clamp(40px,5.1vw,80px);font-weight:400;line-height:1.12;max-width:11em}
html[lang="zh-Hant"] .hero h1{font-size:clamp(40px,5vw,78px);font-weight:400}
.hero .lead{color:var(--fg-2);font-size:17px;max-width:30em;margin:26px 0 42px}
.btns{display:flex;gap:18px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:12px;height:54px;padding:0 30px;border-radius:99px;font-size:14px;font-weight:500;border:2px solid #fff;transition:background .4s var(--ease),color .4s,border-color .4s;cursor:pointer;font-family:inherit;background:transparent;color:#fff}
.pill.w{background:#fff;color:#000}
.pill:hover{background:var(--teal);border-color:var(--teal);color:#000}
.pill svg{width:12px;height:12px}
.scroll-hint{margin-top:64px;font-size:12px;color:var(--fg-3);display:flex;align-items:center;gap:12px}
.scroll-hint::before{content:"";width:1px;height:38px;background:linear-gradient(var(--teal),transparent);animation:drop 2s var(--ease) infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* sections */
.panel h2{font-size:clamp(32px,3.6vw,56px);max-width:13em}
.panel .p{color:var(--fg-2);font-size:16px;max-width:36em;margin-top:30px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:48px;border-top:1px solid var(--line)}
.stat{padding:22px 16px 0 0}
.stat b{display:block;font-size:clamp(26px,2.4vw,36px);font-weight:400;line-height:1.1}
.stat span{display:block;font-size:12.5px;color:var(--fg-3);margin-top:6px;line-height:1.45}
@media(max-width:560px){.stats{grid-template-columns:1fr 1fr 1fr}.stat{padding-bottom:18px}}
.services{margin-top:44px;border-top:1px solid var(--line)}
.svc{display:grid;grid-template-columns:42px 1fr;gap:12px;padding:22px 0;border-bottom:1px solid var(--line)}
.svc .n{font-size:12px;color:var(--teal);font-weight:500;padding-top:5px}
.svc h3{font-size:19px;font-weight:400}
.svc p{color:var(--fg-3);font-size:14.5px;margin:4px 0 0}
.logos{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;background:#e9e9e9;border-radius:10px;overflow:hidden;margin-top:6px}
.logos div{background:#fff;aspect-ratio:2/1;display:flex;align-items:center;justify-content:center;padding:10px 12px}
.logos img{max-height:46px;width:auto;object-fit:contain;filter:grayscale(1);opacity:.75;transition:.4s}
.logos div:hover img{filter:none;opacity:1}
@media(max-width:560px){.logos{grid-template-columns:repeat(3,1fr)}}

/* project list */
.plist{margin-top:44px;border-top:1px solid var(--line)}
.prow{display:grid;grid-template-columns:56px 1fr auto;gap:16px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line);position:relative;transition:padding .5s var(--ease)}
.prow .n{font-size:12px;color:var(--fg-3);font-weight:500}
.prow h3{font-size:clamp(19px,1.6vw,24px);transition:color .4s}
.prow .m{font-size:13px;color:var(--fg-3);margin-top:2px}
.prow .ar{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;transition:.4s var(--ease)}
.prow .ar svg{width:12px;height:12px}
.prow:hover{padding-left:12px}
.prow:hover h3{color:var(--teal)}
.prow:hover .ar{background:var(--teal);border-color:var(--teal);color:#000;transform:rotate(-45deg)}
.more-link{margin-top:36px}

/* contact */
.info{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin:40px 0 44px}
.info dt{font-size:13px;font-weight:500;color:#fff;margin-bottom:4px}
.info dd{margin:0;color:var(--fg-2);font-size:14.5px;line-height:1.6}
.info .full{grid-column:1/-1}
@media(max-width:560px){.info{grid-template-columns:1fr}}
.cf{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cf .full{grid-column:1/-1}
.cf input,.cf textarea{width:100%;font:inherit;font-size:15px;color:#fff;background:transparent;border:0;border-bottom:1px solid rgba(255,255,255,.25);padding:14px 2px;border-radius:0;transition:border-color .3s}
.cf input:focus,.cf textarea:focus{outline:0;border-color:var(--teal)}
.cf input::placeholder,.cf textarea::placeholder{color:var(--fg-3)}
.cf textarea{min-height:110px;resize:vertical}
.cf small{color:var(--fg-3);font-size:12px}
@media(max-width:560px){.cf{grid-template-columns:1fr}}

/* footer */
.foot{padding:48px var(--gut) 90px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:13px;color:var(--fg-3)}
.foot img{height:24px;width:auto;margin-bottom:12px}
.foot a:hover{color:var(--teal)}
.foot .links{display:flex;gap:22px;flex-wrap:wrap;align-items:flex-start}

/* reveal */
.rv{opacity:0;transform:translateY(40px);transition:opacity 1s var(--ease),transform 1.2s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.1s}.rv.d2{transition-delay:.2s}.rv.d3{transition-delay:.3s}.rv.d4{transition-delay:.4s}
.mask{display:block;overflow:hidden}
.mask>span{display:block;transform:translateY(105%);transition:transform 1.3s var(--ease)}
.in .mask>span,.mask.in>span{transform:none}
@media (prefers-reduced-motion:reduce){.rv,.mask>span{opacity:1!important;transform:none!important;transition:none}.media img{transition:none}html{scroll-behavior:auto}}

/* page (projects list / detail / article) */
.page-head{padding:calc(var(--hdr) + 70px) var(--gut) 50px;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(38px,5vw,76px)}
.page-head p{color:var(--fg-2);max-width:40em;margin-top:18px}
.crumb{font-size:13px;color:var(--fg-3);margin-bottom:26px}
.crumb a:hover{color:var(--teal)}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:34px}
.chip{height:38px;padding:0 18px;border-radius:99px;border:1px solid var(--line);background:transparent;color:var(--fg-2);font:inherit;font-size:13px;cursor:pointer;transition:.3s}
.chip:hover{border-color:#fff;color:#fff}.chip.on{background:#fff;color:#000;border-color:#fff}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border-bottom:1px solid var(--line)}
.card{background:var(--bg);display:block;padding:0 0 30px;transition:background .4s}
.card:hover{background:var(--bg-2)}
.card .ph{aspect-ratio:4/3;overflow:hidden;background:var(--bg-3)}
.card .ph img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease),filter .6s;filter:grayscale(.35)}
.card:hover .ph img{transform:scale(1.05);filter:none}
.card .tx{padding:22px 26px 0}
.card small{font-size:12px;color:var(--teal);font-weight:500}
.card h3{font-size:21px;margin:6px 0 8px}
.card p{font-size:14px;color:var(--fg-3);margin:0}
@media(max-width:1000px){.grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.grid{grid-template-columns:1fr}}
.empty{padding:80px var(--gut);color:var(--fg-3)}

.detail .panel{justify-content:flex-start}
.facts{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);margin:36px 0 40px}
.facts div{padding:16px 16px 16px 0;border-bottom:1px solid var(--line)}
.facts dt{font-size:12px;color:var(--fg-3)}
.facts dd{margin:2px 0 0;font-size:15px}
.prose{max-width:40em}
.prose p,.prose li{color:#d6d6d6;font-size:16px}
.prose h2{font-size:clamp(22px,2vw,28px);margin:44px 0 14px}
.prose h3{font-size:19px;margin:30px 0 8px;font-weight:500}
.prose ul,.prose ol{padding-left:20px}
.prose li{margin-bottom:6px}
.prose strong,.prose b{font-weight:500;color:#fff}
.prose a{color:var(--teal)}
.prose figure{margin:32px 0}
.prose figure img{width:100%;border-radius:4px}
.prose figcaption{font-size:13px;color:var(--fg-3);margin-top:8px}
.prose .note{border-left:2px solid var(--teal);padding:4px 0 4px 18px;color:var(--fg-2);font-size:15px;margin:32px 0}
.prose .spec{width:100%;border-collapse:collapse;font-size:14.5px;margin:22px 0}
.prose .spec td{padding:10px 0;border-bottom:1px solid var(--line)}
.prose .spec td:first-child{color:var(--fg-3);width:45%}
.placeholder{aspect-ratio:16/9;border:1px dashed rgba(255,255,255,.18);border-radius:4px;display:flex;align-items:center;justify-content:center;color:var(--fg-3);font-size:13px;text-align:center;padding:16px}
.docs{margin-top:44px}
.docs h2{font-size:22px;margin-bottom:18px}
.doc{border:1px solid var(--line);border-radius:6px;margin-bottom:18px;overflow:hidden;background:var(--bg-2)}
.doc img{width:100%;background:#fff;cursor:zoom-in;display:block}
.doc.dwg img{filter:invert(1) hue-rotate(180deg) brightness(1.15);background:#fff}
.dgrid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}.dgrid .doc{margin:0}
.dgrid .doc img{aspect-ratio:4/3;object-fit:contain}
@media(max-width:560px){.dgrid{grid-template-columns:1fr}}
.doc iframe{width:100%;height:70vh;border:0;background:#fff;display:block}
.doc .dh{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;font-size:13.5px}
.doc .dh span{color:var(--fg-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.doc .dh a{color:var(--teal);font-weight:500;white-space:nowrap}
.lb{position:fixed;inset:0;background:rgba(0,0,0,.94);z-index:300;display:none;align-items:center;justify-content:center;padding:20px;cursor:zoom-out}
.lb.on{display:flex}.lb img{max-height:100%;max-width:100%;object-fit:contain;background:#fff}
.pn{display:flex;justify-content:space-between;gap:20px;padding:40px 0 0;margin-top:56px;border-top:1px solid var(--line);flex-wrap:wrap}
.pn a{max-width:46%}.pn small{display:block;font-size:12px;color:var(--teal);font-weight:500}.pn b{font-weight:400;font-size:17px;line-height:1.35;display:block;margin-top:4px}
.pn a:hover b{color:var(--teal)}
@media(max-width:560px){.pn a{max-width:100%}}

.detail .media img{object-fit:contain;background:var(--bg)}
.detail .media figure::after{background:linear-gradient(180deg,rgba(0,0,0,.35),transparent 20%)}

/* ---- client wall: full-colour logo tiles on a marquee ---- */
.clients-block{margin-top:64px}
.cl-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap;padding-bottom:20px}
.cl-sub{font-size:13px;color:var(--fg-3)}.cl-sub b{font-weight:500;color:var(--teal);margin-right:4px}
.cl-wall{position:relative;display:grid;gap:12px;padding:6px 0;-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.mq{overflow:hidden;padding:6px 0}
.trk{list-style:none;margin:0;padding:0;display:flex;gap:12px;width:max-content;animation:mq 46s linear infinite}
.mq.rev .trk{animation-direction:reverse;animation-duration:52s}
.cl-wall:hover .trk{animation-play-state:paused}
@keyframes mq{to{transform:translateX(calc(-50% - 6px))}}
.lg{position:relative;flex:none;width:188px;height:104px;border-radius:14px;background:#f4f6f6;display:flex;align-items:center;justify-content:center;box-shadow:inset 0 0 0 1px rgba(0,0,0,.04);transition:transform .6s var(--ease),box-shadow .5s var(--ease),background .4s}
.lg img{display:block;object-fit:contain;transition:transform .6s var(--ease)}
.lg .cap{position:absolute;left:0;right:0;bottom:9px;text-align:center;font-size:10.5px;font-weight:500;letter-spacing:.04em;color:#007a7a;opacity:0;transform:translateY(4px);transition:opacity .35s,transform .5s var(--ease);white-space:nowrap}
.lg:hover{transform:translateY(-4px);background:#fff;box-shadow:0 0 0 2px var(--teal),0 18px 40px -18px rgba(0,204,204,.55)}
.lg:hover img{transform:translateY(-7px)}
.lg:hover .cap{opacity:1;transform:none}
@media(max-width:560px){.lg{width:150px;height:88px}.lg img{transform:scale(.82)}.lg:hover img{transform:scale(.82) translateY(-8px)}.trk{animation-duration:36s}}
@media (prefers-reduced-motion:reduce){
  .cl-wall{-webkit-mask-image:none;mask-image:none}
  .trk{animation:none;width:auto;flex-wrap:wrap}
  .lg[aria-hidden]{display:none}
  .lg{width:calc(33.333% - 8px)}
}

.doc img,.lb img{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.docs+.docs{margin-top:56px}