/* Wee Seng v4 "Night app": clean base, app-feel, depth, texture, movement */
:root{--bg:#07111f;--bg2:#0a1626;--surf:#0d1b2e;--line:rgba(150,210,255,.12);--ink:#e7f0f9;--mute:#8fa7bf;--cy:#19c8ff;--bl:#2a8cf0;--deep:#04649a;--w:1200px;--g:clamp(18px,4vw,40px);--r:22px;--ease:cubic-bezier(.16,1,.3,1);--sec:clamp(64px,8vw,104px)}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;overflow-x:clip;scroll-padding-top:76px}
body{background:var(--bg);color:var(--ink);font:400 15.5px/1.6 Geist,system-ui,sans-serif;overflow-x:clip;-webkit-font-smoothing:antialiased}
img{display:block;width:100%;height:100%;object-fit:cover}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
.wrap{max-width:var(--w);margin:0 auto;padding:0 var(--g)}
h1,h2,h3,.disp{font-family:Archivo,sans-serif;letter-spacing:-.035em;line-height:1.02}
.mono{font:500 11.5px "Geist Mono",monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--mute)}
/* texture + app chrome */
body::after{content:"";position:fixed;inset:0;z-index:90;pointer-events:none;opacity:.07;mix-blend-mode:overlay;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .9 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>")}
.prog{position:fixed;left:0;top:0;height:2px;width:100%;z-index:80;background:linear-gradient(90deg,var(--cy),var(--bl));transform-origin:0 50%;transform:scaleX(0)}
@supports (animation-timeline:scroll()){.prog{animation:grow linear both;animation-timeline:scroll(root)}@keyframes grow{to{transform:scaleX(1)}}}
.spot{position:fixed;inset:0;z-index:1;pointer-events:none;background:radial-gradient(520px circle at var(--sx,70%) var(--sy,20%),rgba(25,200,255,.10),transparent 60%)}
/* gradient border card + spotlight */
.gb{position:relative;border-radius:var(--r);background:linear-gradient(180deg,#0f2036,#0a1626);box-shadow:inset 0 1px 0 rgba(255,255,255,.07),0 24px 50px -28px rgba(0,0,0,.9);isolation:isolate;overflow:hidden}
.gb::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;background:linear-gradient(160deg,rgba(120,220,255,.55),rgba(120,220,255,.06) 38%,rgba(42,140,240,.28));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;z-index:3}
.gb::after{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(280px circle at var(--mx,50%) var(--my,0%),rgba(25,200,255,.18),transparent 62%);opacity:0;transition:opacity .4s;pointer-events:none;z-index:2}
.gb:hover::after{opacity:1}
/* buttons */
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;justify-content:center;gap:10px;border:0;cursor:pointer;font:600 14.5px Archivo;letter-spacing:-.01em;padding:13px 20px;border-radius:14px;color:#04223a;background:linear-gradient(180deg,#6fe0ff,#19c8ff 60%,#12a9e3);box-shadow:inset 0 1px 0 rgba(255,255,255,.6),0 12px 28px -10px rgba(25,200,255,.7);transition:transform .3s var(--ease),box-shadow .3s}
.btn::before{content:"";position:absolute;inset:0;background:linear-gradient(110deg,transparent 35%,rgba(255,255,255,.55) 50%,transparent 65%);transform:translateX(-130%);animation:sheen 5s 1.5s infinite}
@keyframes sheen{0%,70%,100%{transform:translateX(-130%)}85%{transform:translateX(130%)}}
.btn:hover{box-shadow:inset 0 1px 0 rgba(255,255,255,.6),0 18px 36px -10px rgba(25,200,255,.85)}.btn:active{transform:scale(.97)!important}
.btn.ghost{color:var(--ink);background:rgba(255,255,255,.06);box-shadow:inset 0 0 0 1px var(--line),inset 0 1px 0 rgba(255,255,255,.08)}.btn.ghost::before{display:none}
.btn.sm{padding:9px 14px;font-size:13.5px;border-radius:12px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.06);box-shadow:inset 0 0 0 1px var(--line);font:500 12.5px Geist;color:#c3d3e3}
.ico{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:11px;font-size:18px;color:var(--cy);background:linear-gradient(145deg,rgba(25,200,255,.22),rgba(42,140,240,.06));box-shadow:inset 0 1px 0 rgba(255,255,255,.14)}
/* app bar */
.bar{position:fixed;inset:0 0 auto 0;z-index:70;transition:background .3s,backdrop-filter .3s}
.bar.solid{background:rgba(7,17,31,.72);backdrop-filter:blur(18px) saturate(1.4);box-shadow:0 1px 0 var(--line)}
.bar .wrap{display:flex;align-items:center;justify-content:space-between;height:62px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font:700 16px Archivo;letter-spacing:-.02em}.brand img{width:auto;height:30px}
.bar nav{display:flex;gap:4px;padding:4px;border-radius:14px;background:rgba(255,255,255,.05);box-shadow:inset 0 0 0 1px var(--line)}
.bar nav a{padding:7px 14px;border-radius:10px;font-size:13.5px;color:#b8cadc;transition:.25s}.bar nav a:hover{background:rgba(255,255,255,.08);color:#fff}
/* hero */
.hero{position:relative;min-height:100dvh;display:flex;align-items:center;overflow:hidden;isolation:isolate;padding:96px 0 64px}
.hero .bgimg{position:absolute;inset:0;z-index:-3;-webkit-mask-image:linear-gradient(180deg,#000 40%,transparent 98%);mask-image:linear-gradient(180deg,#000 40%,transparent 98%)}
.hero .bgimg img{opacity:.55;transform:scale(1.08);animation:kb 22s ease-in-out infinite alternate}
@keyframes kb{to{transform:scale(1.18) translate(-1.5%,1%)}}
.hero::before{content:"";position:absolute;inset:0;z-index:-2;background:radial-gradient(900px 600px at 78% 35%,rgba(25,200,255,.14),transparent 60%),linear-gradient(90deg,var(--bg) 14%,rgba(7,17,31,.55) 58%,rgba(7,17,31,.2))}
.dots{position:absolute;inset:0;z-index:-2;background-image:radial-gradient(rgba(150,210,255,.22) 1px,transparent 1.3px);background-size:24px 24px;-webkit-mask-image:radial-gradient(60% 70% at 70% 40%,#000,transparent 75%);mask-image:radial-gradient(60% 70% at 70% 40%,#000,transparent 75%)}
.flow{position:absolute;inset:0;z-index:-1;width:100%;height:100%;pointer-events:none;-webkit-mask-image:radial-gradient(70% 80% at 60% 50%,#000 20%,transparent 80%);mask-image:radial-gradient(70% 80% at 60% 50%,#000 20%,transparent 80%)}
.flow path{fill:none;stroke:url(#fg);stroke-width:1.6;stroke-linecap:round;stroke-dasharray:90 700;animation:fl 9s linear infinite;filter:drop-shadow(0 0 6px rgba(25,200,255,.7))}
.flow path:nth-child(2){animation-duration:12s;animation-delay:-3s}.flow path:nth-child(3){animation-duration:10s;animation-delay:-6s}.flow path:nth-child(4){animation-duration:14s;animation-delay:-2s}.flow path:nth-child(5){animation-duration:11s;animation-delay:-8s}.flow path:nth-child(6){animation-duration:13s;animation-delay:-5s}
@keyframes fl{to{stroke-dashoffset:-790}}
.hero .wrap{width:100%;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(40px,5.6vw,72px);font-weight:800;max-width:11.5ch;margin:18px 0 16px}
.hero h1 b{font-weight:800;color:var(--cy)}
.hero .sub{color:#aebfd1;font-size:17px;max-width:38ch;margin-bottom:26px}
.hero .cta{display:flex;gap:10px;flex-wrap:wrap}
.trio{margin-top:34px;display:flex;gap:10px;flex-wrap:wrap}
.trio .chip i{color:var(--cy);font-size:15px}
[data-h]>*{animation:up .9s var(--ease) both}[data-h]>*:nth-child(2){animation-delay:.08s}[data-h]>*:nth-child(3){animation-delay:.16s}[data-h]>*:nth-child(4){animation-delay:.24s}[data-h]>*:nth-child(5){animation-delay:.32s}
@keyframes up{from{opacity:0;transform:translateY(22px)}}
/* 3D stack */
.stage3{position:relative;height:520px;perspective:1500px;transform-style:preserve-3d}
.stack3{position:absolute;inset:0;transform-style:preserve-3d;transform:rotateX(calc(7deg + var(--ry,0deg))) rotateY(calc(-17deg + var(--rx,0deg)));transition:transform .5s var(--ease)}
.lay{position:absolute;border-radius:20px;overflow:hidden;box-shadow:0 40px 80px -30px rgba(0,0,0,.9),inset 0 0 0 1px rgba(255,255,255,.1);animation:flt 7s ease-in-out infinite}
.lay::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.18),transparent 40%,rgba(7,17,31,.35));pointer-events:none}
.l1{width:62%;height:360px;left:18%;top:70px;transform:translateZ(80px)}
.l2{width:44%;height:250px;left:-4%;top:0;transform:translateZ(0);animation-delay:-2s}
.l3{width:42%;height:230px;right:-2%;bottom:6px;transform:translateZ(150px);animation-delay:-4s}
@keyframes flt{50%{translate:0 -12px}}
.fchip{position:absolute;z-index:5;transform:translateZ(190px);animation:flt 6s ease-in-out infinite;backdrop-filter:blur(10px);background:rgba(10,22,38,.7)}
.fc1{left:2%;bottom:60px}.fc2{right:8%;top:22px;animation-delay:-3s}.fc3{left:38%;bottom:-8px;animation-delay:-1.5s}
/* sections */
section{position:relative;padding:var(--sec) 0}
.head{display:flex;justify-content:space-between;align-items:end;gap:20px;flex-wrap:wrap;margin-bottom:36px}
h2{font-size:clamp(30px,3.8vw,48px);font-weight:800;max-width:15ch}
.head p{color:var(--mute);max-width:44ch}
.rv{opacity:0;transform:translateY(26px) scale(.985);transition:opacity .9s var(--ease),transform .9s var(--ease)}.rv.in{opacity:1;transform:none}
/* bento */
.bento{display:grid;grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(3,minmax(230px,auto));gap:14px}
.tile{display:flex;flex-direction:column;justify-content:flex-end;padding:20px;min-height:230px}
.tile .im{position:absolute;inset:0;z-index:-1;-webkit-mask-image:linear-gradient(180deg,#000 10%,rgba(0,0,0,.2) 62%,transparent 92%);mask-image:linear-gradient(180deg,#000 10%,rgba(0,0,0,.2) 62%,transparent 92%)}
.tile .im img{transition:transform 1.4s var(--ease);transform:scale(1.03)}.tile:hover .im img{transform:scale(1.1)}
.tile .top{position:absolute;left:18px;right:18px;top:18px;display:flex;justify-content:space-between;z-index:4}
.tile h3{font-size:22px;margin-bottom:4px}.tile p{color:#a9bccf;font-size:14px;max-width:34ch}
.go{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.08);box-shadow:inset 0 0 0 1px var(--line);transition:.35s var(--ease)}
.tile:hover .go{background:var(--cy);color:#04223a;transform:rotate(-45deg)}
.t1{grid-column:1/5;grid-row:1/3}.t1 h3{font-size:32px}.t2{grid-column:5/7}.t3{grid-column:5/7}.t4{grid-column:1/4}.t5{grid-column:4/7}
/* where we work */
.where .box{display:grid;grid-template-columns:.8fr 1.2fr;gap:20px}
.seg{position:relative;display:flex;gap:2px;padding:4px;border-radius:16px;background:rgba(255,255,255,.05);box-shadow:inset 0 0 0 1px var(--line);overflow:auto;scrollbar-width:none;width:max-content;max-width:100%}
.seg::-webkit-scrollbar{display:none}
.seg button{position:relative;z-index:1;background:none;border:0;cursor:pointer;padding:9px 15px;border-radius:12px;font:600 13.5px Archivo;color:var(--mute);white-space:nowrap;transition:color .3s}
.seg button[aria-selected=true]{color:#04223a}
.thumb{position:absolute;z-index:0;top:4px;bottom:4px;border-radius:12px;background:linear-gradient(180deg,#6fe0ff,#19c8ff);box-shadow:0 8px 18px -8px rgba(25,200,255,.8);transition:left .5s var(--ease),width .5s var(--ease)}
.info{padding:22px;display:flex;flex-direction:column;gap:16px;justify-content:space-between}
.info h3{font-size:26px}.info .cap{color:#b4c6d8;min-height:48px}
.list{display:grid;gap:8px}
.cell{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:14px;background:rgba(255,255,255,.04);box-shadow:inset 0 0 0 1px var(--line);font-size:14px}
.cell .meta{margin-left:auto;color:var(--mute);font-size:12.5px}
.view{position:relative;min-height:420px;border-radius:var(--r);overflow:hidden}
.view img{position:absolute;inset:0;clip-path:circle(0% at 80% 20%);transition:clip-path 1.1s var(--ease);z-index:0}
.view img.on{clip-path:circle(150% at 80% 20%);z-index:1}
.view::after{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;background:linear-gradient(0deg,rgba(7,17,31,.55),transparent 40%)}
/* process */
.steps{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;perspective:1200px}
.line{position:absolute;left:0;right:0;top:-18px;height:2px;background:var(--line)}
.line i{position:absolute;inset:0;background:linear-gradient(90deg,var(--cy),var(--bl));transform-origin:0 50%;transform:scaleX(0);transition:transform 1.8s var(--ease)}.steps.in .line i{transform:scaleX(1)}
.step{padding:20px;transform-style:preserve-3d;transition:transform .5s var(--ease)}
.step:hover{transform:rotateX(6deg) rotateY(-6deg) translateY(-6px)}
.step .n{font:800 34px Archivo;letter-spacing:-.04em;color:rgba(255,255,255,.12);margin-bottom:22px}
.step h3{font-size:20px;margin-bottom:6px}.step p{color:#a9bccf;font-size:14px}
/* guides */
.rail{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px var(--g) 16px;margin:0 calc(var(--g) * -1);scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.card{flex:0 0 min(360px,80vw);scroll-snap-align:start;display:flex;flex-direction:column}
.card .ph{aspect-ratio:16/10;position:relative;-webkit-mask-image:linear-gradient(180deg,#000 70%,transparent);mask-image:linear-gradient(180deg,#000 70%,transparent)}
.card .ph img{transition:transform 1.2s var(--ease)}.card:hover .ph img{transform:scale(1.07)}
.card .body{padding:0 18px 18px;margin-top:-6px;position:relative;z-index:4}
.card h3{font-size:19px;margin-top:8px;line-height:1.12}
/* cta aurora */
.band{position:relative;overflow:hidden;isolation:isolate;margin:0 var(--g);border-radius:28px;padding:clamp(40px,6vw,72px);background:linear-gradient(135deg,#04649a,#0a7fc2 55%,#19c8ff)}
.band .au{position:absolute;border-radius:50%;filter:blur(60px);z-index:-1;animation:au 14s ease-in-out infinite alternate}
.au.a{width:420px;height:420px;right:-80px;top:-120px;background:#7ff0ff;opacity:.55}.au.b{width:380px;height:380px;left:10%;bottom:-200px;background:#0a4a82;opacity:.7;animation-delay:-6s}
@keyframes au{to{transform:translate(-60px,40px) scale(1.2)}}
.band::before{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);background-size:44px 44px;-webkit-mask-image:radial-gradient(60% 90% at 85% 20%,#000,transparent 75%);mask-image:radial-gradient(60% 90% at 85% 20%,#000,transparent 75%)}
.band h2{max-width:13ch;color:#fff;text-shadow:0 4px 30px rgba(2,30,60,.4)}.band .btn{margin-top:22px;background:linear-gradient(180deg,#fff,#dff6ff);color:#04223a}
.band .row{display:flex;gap:30px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.band .photo{width:min(360px,100%);aspect-ratio:16/11;border-radius:20px;overflow:hidden;box-shadow:0 30px 60px -20px rgba(2,30,60,.8);transform:perspective(900px) rotateY(-10deg) rotateX(3deg)}
/* contact + footer */
.contact .wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.contact p{color:var(--mute);margin:12px 0 22px;max-width:42ch}
.tel{display:block;font:800 clamp(34px,5.4vw,72px)/.95 Archivo;letter-spacing:-.045em;white-space:nowrap}
.tel:hover{color:var(--cy)}
footer{padding:40px 0 100px;border-top:1px solid var(--line);color:var(--mute);font-size:13.5px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
/* quote sheet */
dialog{border:0;padding:0;background:transparent;color:var(--ink);max-width:none;max-height:none;margin:0;inset:0;width:100%;height:100%;display:none;align-items:flex-end;justify-content:center}
dialog[open]{display:flex}
dialog::backdrop{background:rgba(3,8,16,.6);backdrop-filter:blur(8px)}
.sheet{width:min(520px,100%);border-radius:28px 28px 0 0;padding:14px 22px 26px;background:linear-gradient(180deg,#10243b,#0a1626);box-shadow:0 -30px 80px -20px rgba(0,0,0,.8),inset 0 1px 0 rgba(255,255,255,.1);animation:sheet .55s var(--ease)}
@keyframes sheet{from{transform:translateY(60%);opacity:0}}
.grab{width:42px;height:4px;border-radius:4px;background:rgba(255,255,255,.2);margin:0 auto 16px}
.sheet h3{font-size:24px;margin-bottom:4px}.sheet>p{color:var(--mute);font-size:14px;margin-bottom:16px}
.sheet label{display:grid;gap:6px;font:600 13px Archivo;margin-bottom:12px}
.sheet input,.sheet textarea{background:#08121f;border:1px solid var(--line);border-radius:14px;color:var(--ink);padding:13px 14px;font:inherit}
.sheet input:focus,.sheet textarea:focus{outline:2px solid var(--cy);outline-offset:1px}
.sheet .row{display:flex;gap:10px;margin-top:6px}.sheet .row .btn{flex:1}
@media(min-width:760px){dialog{align-items:center}.sheet{border-radius:28px;padding:22px 26px 26px}.grab{display:none}}
/* tab bar (mobile) */
.tabs{display:none}
.note{position:fixed;left:50%;transform:translateX(-50%);bottom:12px;z-index:95;background:rgba(0,0,0,.65);color:#fff;font:500 11px Geist;padding:5px 9px;border-radius:8px;pointer-events:none}
@media(max-width:900px){
 .bar nav{display:none}.bar .btn{display:none}
 .hero{min-height:auto;padding:88px 0 40px}.hero .wrap,.where .box,.contact .wrap{grid-template-columns:1fr}.stage3{height:300px;margin-top:8px}.l1{height:200px;top:50px}.l2{height:140px}.l3{height:130px}
 .stack3{transform:rotateX(5deg) rotateY(-10deg)}
 .bento{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;margin:0 calc(var(--g) * -1);padding:0 var(--g) 14px;scrollbar-width:none}.bento::-webkit-scrollbar{display:none}
 .tile,.t1{flex:0 0 78vw;min-height:320px;scroll-snap-align:start}.t1 h3{font-size:24px}
 .steps{grid-template-columns:1fr 1fr}.line{display:none}
 .view{min-height:260px}.band .photo{display:none}
 footer{padding-bottom:110px}
 .tabs{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:12px;right:12px;bottom:calc(10px + env(safe-area-inset-bottom));z-index:75;padding:6px;border-radius:22px;background:rgba(10,22,38,.78);backdrop-filter:blur(20px) saturate(1.5);box-shadow:inset 0 0 0 1px var(--line),0 20px 40px -10px rgba(0,0,0,.7)}
 .tabs a{display:grid;justify-items:center;gap:2px;padding:7px 4px;border-radius:16px;font:500 11px Geist;color:var(--mute);transition:.3s}.tabs a i{font-size:21px}
 .tabs a.on{color:var(--cy);background:rgba(25,200,255,.1)}.tabs a.q{color:#04223a;background:linear-gradient(180deg,#6fe0ff,#19c8ff);font-weight:600}
 .note{display:none}
}
@media(max-width:520px){.steps{grid-template-columns:1fr}.hero h1{font-size:40px}.contact .tel{font-size:36px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}.view img.on{clip-path:none}.steps .line i{transform:scaleX(1)}}

/* ===== v4 concept layer: air made visible ===== */
.hero .wrap{grid-template-columns:1fr}
.hero.air{min-height:100svh;align-items:flex-end;padding:96px 0 clamp(28px,5vw,56px)}
#air{position:absolute;inset:0;z-index:-1;width:100%;height:100%}
.hero.air::before{background:radial-gradient(900px 560px at 70% 40%,rgba(25,200,255,.10),transparent 60%),linear-gradient(90deg,rgba(7,17,31,.9) 6%,rgba(7,17,31,.35) 50%,rgba(7,17,31,0) 85%),linear-gradient(0deg,var(--bg) 0%,transparent 28%)}
.hero.air .bgimg img{opacity:.38}
.hero.air h1{font-size:clamp(64px,13.5vw,196px);line-height:.86;letter-spacing:-.055em;max-width:none;margin:14px 0 10px}
.hero.air h1 .l{display:inline-block;animation:up 1s var(--ease) both;animation-delay:calc(var(--i) * 45ms + 150ms)}
.hero.air h2.tag{font-size:clamp(20px,2.6vw,34px);font-weight:600;letter-spacing:-.03em;max-width:none;color:#c3d3e3;margin-bottom:18px}
.hero.air .sub{max-width:44ch}
.hud{position:absolute;left:0;right:0;bottom:0;z-index:2;pointer-events:none}
.hud .wrap{display:block;position:relative;height:0}
.hud span{position:absolute;bottom:18px;white-space:nowrap}
.hud .in{left:var(--g)}.hud .out{right:var(--g)}
.hud .fl{left:calc(var(--g) + (100% - 2*var(--g)) * .62);transform:translateX(-50%);color:var(--cy)}
.dimline{display:block;height:10px;margin:10px 0 0;position:relative}
.dimline::before,.dimline::after{content:"";position:absolute;top:0;width:1.5px;height:10px;background:var(--cy)}
.dimline::before{left:0}.dimline::after{right:0}
.dimline i{position:absolute;left:0;right:0;top:4.5px;height:1.5px;background:var(--cy);transform-origin:0 50%;transform:scaleX(0);transition:transform 1.2s .3s var(--ease)}.in .dimline i,.dimline.in i{transform:scaleX(1)}
/* story */
.story{position:relative;height:420vh}
.story .pin{position:sticky;top:0;height:100svh;display:flex;align-items:center;overflow:hidden}
.story{view-timeline-name:--st;view-timeline-axis:block;timeline-scope:--st}
.story .wrap{position:relative;width:100%;display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center;height:100%}
.story .copy{position:relative;height:300px}
.story .stn{position:absolute;inset:0;opacity:0}
.story .stn:first-child{opacity:1}
.story .stn h3{font-size:clamp(34px,4.4vw,60px);margin:14px 0 12px}.story .stn p{color:#aebfd1;max-width:36ch;font-size:16.5px}
.story .vis{position:relative;height:min(64vh,520px);perspective:1400px}
.story .plane{position:absolute;inset:0;transform:rotateY(-14deg) rotateX(5deg);transform-style:preserve-3d;border-radius:var(--r);overflow:hidden;box-shadow:0 50px 100px -40px rgba(0,0,0,.9),inset 0 0 0 1px rgba(255,255,255,.1)}
.story .plane img{position:absolute;inset:0;opacity:0;transform:scale(1.08)}
.story .plane img:first-child{opacity:1;transform:none}
.story .plane::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.14),transparent 40%,rgba(7,17,31,.4));pointer-events:none}
.duct{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);width:100%;height:120px;z-index:0;pointer-events:none;overflow:visible}
.duct path{fill:none;stroke-linecap:round;stroke-linejoin:round}
.duct .base{stroke:rgba(150,210,255,.14);stroke-width:26}
.duct .core{stroke:rgba(150,210,255,.28);stroke-width:1.5;stroke-dasharray:4 7}
.duct .run{stroke:var(--cy);stroke-width:2.5;stroke-dasharray:1000;stroke-dashoffset:1000;filter:drop-shadow(0 0 8px rgba(25,200,255,.9))}
.story .prog2{position:absolute;left:var(--g);right:var(--g);bottom:36px;display:flex;gap:8px;z-index:3}
.story .prog2 i{flex:1;height:3px;border-radius:3px;background:var(--line);overflow:hidden;position:relative}
.story .prog2 i::after{content:"";position:absolute;inset:0;background:var(--cy);transform:scaleX(0);transform-origin:0 50%}
@supports (animation-timeline:view()){
 .story .run{animation:draw linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 @keyframes draw{to{stroke-dashoffset:0}}
 .story .stn:nth-child(1){animation:s1 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .stn:nth-child(2){animation:s2 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .stn:nth-child(3){animation:s3 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .stn:nth-child(4){animation:s4 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 @keyframes s1{0%,17%{opacity:1;transform:none}23%,100%{opacity:0;transform:translateY(-24px)}}
 @keyframes s2{0%,27%{opacity:0;transform:translateY(24px)}33%,42%{opacity:1;transform:none}48%,100%{opacity:0;transform:translateY(-24px)}}
 @keyframes s3{0%,52%{opacity:0;transform:translateY(24px)}58%,67%{opacity:1;transform:none}73%,100%{opacity:0;transform:translateY(-24px)}}
 @keyframes s4{0%,77%{opacity:0;transform:translateY(24px)}83%,100%{opacity:1;transform:none}}
 .story .plane img:nth-child(1){animation:p1 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .plane img:nth-child(2){animation:p2 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .plane img:nth-child(3){animation:p3 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .plane img:nth-child(4){animation:p4 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 @keyframes p1{0%,22%{opacity:1;transform:none}30%,100%{opacity:0;transform:scale(1.08)}}
 @keyframes p2{0%,22%{opacity:0;transform:scale(1.08)}30%,47%{opacity:1;transform:none}55%,100%{opacity:0;transform:scale(1.08)}}
 @keyframes p3{0%,47%{opacity:0;transform:scale(1.08)}55%,72%{opacity:1;transform:none}80%,100%{opacity:0;transform:scale(1.08)}}
 @keyframes p4{0%,72%{opacity:0;transform:scale(1.08)}80%,100%{opacity:1;transform:none}}
 .story .prog2 i:nth-child(1)::after{animation:b1 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .prog2 i:nth-child(2)::after{animation:b2 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .prog2 i:nth-child(3)::after{animation:b3 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 .story .prog2 i:nth-child(4)::after{animation:b4 linear both;animation-timeline:--st;animation-range:contain 0% contain 100%}
 @keyframes b1{0%{transform:scaleX(0)}25%,100%{transform:scaleX(1)}}
 @keyframes b2{0%,25%{transform:scaleX(0)}50%,100%{transform:scaleX(1)}}
 @keyframes b3{0%,50%{transform:scaleX(0)}75%,100%{transform:scaleX(1)}}
 @keyframes b4{0%,75%{transform:scaleX(0)}100%{transform:scaleX(1)}}
}
@supports not (animation-timeline:view()){.story{height:auto}.story .pin{position:relative;height:auto;padding:80px 0}.story .copy{height:auto}.story .stn{position:relative;opacity:1;margin-bottom:28px}.story .duct,.story .prog2{display:none}.story .plane img{display:none}.story .plane img:first-child{display:block}}
/* calculator */
.calc .box{display:grid;grid-template-columns:.9fr 1.1fr;gap:20px}
.ctrl{padding:24px;display:grid;gap:20px;align-content:start}
.ctrl h3{font-size:24px}
.uses{display:flex;flex-wrap:wrap;gap:8px}
.use{cursor:pointer;border:0;padding:8px 13px;border-radius:12px;background:rgba(255,255,255,.05);box-shadow:inset 0 0 0 1px var(--line);font:600 13px Archivo;color:var(--mute);transition:.3s var(--ease)}
.use[aria-pressed=true]{background:linear-gradient(180deg,#6fe0ff,#19c8ff);color:#04223a;box-shadow:0 8px 18px -8px rgba(25,200,255,.8)}
.rng{display:grid;gap:8px}.rng .t{display:flex;justify-content:space-between;font:600 13px Archivo}.rng output{font:500 13px "Geist Mono";color:var(--cy)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--cy) var(--p,40%),rgba(255,255,255,.12) var(--p,40%));outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 0 0 5px rgba(25,200,255,.25),0 6px 14px rgba(0,0,0,.5);cursor:grab}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border:0;border-radius:50%;background:#fff;box-shadow:0 0 0 5px rgba(25,200,255,.25)}
.res{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.res div{padding:12px;border-radius:14px;background:rgba(255,255,255,.04);box-shadow:inset 0 0 0 1px var(--line)}
.res b{display:block;font:800 22px Archivo;letter-spacing:-.04em}.res small{color:var(--mute);font-size:11.5px}
.fine{color:var(--mute);font-size:12.5px;line-height:1.45}
.planeWrap{padding:18px;display:grid;place-items:center;perspective:1300px;min-height:440px}
.plan{width:100%;max-width:560px;transform:rotateX(38deg) rotateZ(-8deg) scale(.92);transition:transform .9s var(--ease);transform-style:preserve-3d}
.planeWrap:hover .plan{transform:rotateX(14deg) rotateZ(-2deg) scale(1)}
.plan svg{width:100%;height:auto;overflow:visible;display:block;filter:drop-shadow(0 30px 40px rgba(0,0,0,.6))}
.plan .room{fill:rgba(25,200,255,.06);stroke:rgba(150,210,255,.55);stroke-width:1.6}
.plan .gr{fill:#0a1626;stroke:var(--cy);stroke-width:2}
.plan .dl{stroke:var(--cy);stroke-width:1.4;fill:none}
.plan .arr{fill:none;stroke:var(--cy);stroke-width:2;stroke-linecap:round;stroke-dasharray:6 10;animation:dsh 1.4s linear infinite}
@keyframes dsh{to{stroke-dashoffset:-32}}
.plan text{font:500 11px "Geist Mono";fill:#9db6cc;letter-spacing:.06em}
.plan .dirty{stroke:#8d98a5}
/* where + misc tweaks */
@media(max-width:900px){.story{height:auto}.story .pin{position:relative;height:auto;padding:56px 0}.story .wrap{grid-template-columns:1fr;gap:28px;height:auto}.story .copy{height:auto}.story .stn{position:relative;opacity:1;animation:none!important;margin-bottom:22px}.story .duct,.story .prog2{display:none}.story .plane img{animation:none!important}.story .plane img:nth-child(n+2){display:none}.story .vis{height:260px}.calc .box{grid-template-columns:1fr}.planeWrap{min-height:300px}.hero.air h1{font-size:clamp(56px,17vw,100px)}.hud{display:none}.res b{font-size:18px}}
#fan3d{position:absolute;z-index:-1;left:calc(62% - min(24vw,300px));top:50%;width:min(48vw,600px);height:min(48vw,600px);transform:translateY(-52%);opacity:0;transition:opacity 1.4s var(--ease);pointer-events:none}
#fan3d.ready{opacity:1}
.cell .ico{display:grid;place-items:center;width:22px;height:22px;border-radius:7px;background:rgba(25,200,255,.15);color:var(--cy);font-size:13px}
.info .list .cell{animation:up .5s var(--ease) both}
.spotlight{display:none}
.hero.air .cta .btn{padding:14px 22px;font-size:15px}
.why-sm{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
@media(max-width:900px){#fan3d{left:auto;right:-12%;top:30%;width:78vw;height:78vw;transform:none;opacity:.9}}
.tile .ico,.tile .go{background:rgba(7,17,31,.62);backdrop-filter:blur(10px);box-shadow:inset 0 0 0 1px rgba(255,255,255,.14)}
@media(max-width:900px){.hero.air{padding-bottom:120px}}

/* ===== polish layer ===== */
::selection{background:rgba(25,200,255,.35);color:#fff}
:focus-visible{outline:2px solid var(--cy);outline-offset:3px;border-radius:10px}
html{scrollbar-color:#1c3d60 var(--bg);scrollbar-width:thin}
h2,h3{text-wrap:balance}p{text-wrap:pretty}
.res b,.rng output,.mono{font-variant-numeric:tabular-nums}
/* intro reveal */
.intro{position:fixed;inset:0;z-index:200;background:radial-gradient(600px 400px at 50% 45%,#0c2240,#050d18);display:grid;place-content:center;justify-items:center;gap:22px;transition:clip-path 1.2s var(--ease)}
.intro.out{clip-path:inset(0 0 100% 0)}
.intro img{width:84px;height:auto;animation:ispin 1.5s var(--ease) both;filter:drop-shadow(0 0 24px rgba(25,200,255,.55))}
.intro .ib{width:150px;height:2px;background:var(--line);overflow:hidden;border-radius:2px}.intro .ib i{display:block;height:100%;background:var(--cy);transform:scaleX(0);transform-origin:0 50%;animation:ild 1.3s var(--ease) forwards}
.intro .mono{animation:up 1s .2s var(--ease) both}
@keyframes ispin{from{opacity:0;transform:rotate(-90deg) scale(.6)}}@keyframes ild{to{transform:scaleX(1)}}
/* hero depth */
.hero.air .bgimg,.hero.air .dots{transition:translate .8s var(--ease);translate:calc(var(--px,0) * -16px) calc(var(--py,0) * -10px)}
.hero.air .dots{translate:calc(var(--px,0) * -26px) calc(var(--py,0) * -16px)}
#fan3d{translate:calc(var(--px,0) * 22px) calc(var(--py,0) * 14px);transition:opacity 1.4s var(--ease),translate .8s var(--ease)}
.hero.air .wrap>div{translate:calc(var(--px,0) * -8px) calc(var(--py,0) * -5px);transition:translate .8s var(--ease)}
.fanglow{position:absolute;z-index:-2;left:calc(62% - min(32vw,400px));top:50%;width:min(64vw,800px);aspect-ratio:1;transform:translateY(-52%);pointer-events:none;background:radial-gradient(circle,rgba(25,200,255,.24),rgba(42,140,240,.08) 40%,transparent 66%);animation:pulse 6s ease-in-out infinite}
.rays{position:absolute;z-index:-2;left:calc(62% - min(34vw,420px));top:50%;width:min(68vw,840px);aspect-ratio:1;transform:translateY(-52%);pointer-events:none;background:conic-gradient(from 0deg,transparent 0 6%,rgba(25,200,255,.11) 8%,transparent 11% 25%,rgba(25,200,255,.08) 28%,transparent 32% 50%,rgba(25,200,255,.10) 53%,transparent 57% 75%,rgba(25,200,255,.08) 78%,transparent 82%);-webkit-mask-image:radial-gradient(circle,#000 20%,transparent 64%);mask-image:radial-gradient(circle,#000 20%,transparent 64%);animation:spin2 50s linear infinite}
@keyframes pulse{50%{opacity:.7;transform:translateY(-52%) scale(1.06)}}@keyframes spin2{to{transform:translateY(-52%) rotate(360deg)}}
.vig{position:absolute;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(120% 90% at 50% 40%,transparent 55%,rgba(3,8,16,.55))}
/* tiles: tilt + tags */
.tile.in{transition:transform .35s var(--ease),opacity .9s var(--ease)}
.tile{transform-style:preserve-3d;will-change:transform}
.tile .tg{margin-bottom:8px;color:var(--cy);opacity:.9}
/* buttons: ripple */
.btn .rp{position:absolute;border-radius:50%;background:rgba(255,255,255,.55);width:12px;height:12px;margin:-6px 0 0 -6px;transform:scale(0);animation:rp .7s ease-out forwards;pointer-events:none}
@keyframes rp{to{transform:scale(28);opacity:0}}
.btn i{transition:transform .35s var(--ease)}.btn:hover i.ph-arrow-up-right{transform:translate(2px,-2px)}
/* link underline detail */
.cell,.card h3{transition:transform .35s var(--ease)}
.card:hover h3{transform:translateX(4px)}
/* story ghost numerals */
.story .stn::before{content:attr(data-n);position:absolute;left:-14px;top:-108px;font:800 clamp(140px,17vw,250px)/1 Archivo;letter-spacing:-.07em;color:transparent;-webkit-text-stroke:1px rgba(150,210,255,.16);z-index:-1;pointer-events:none}
/* calculator extras */
.gauge{margin-top:2px;position:relative}
.gauge svg{width:100%;height:auto;display:block;overflow:visible}
.gauge .trk{fill:none;stroke:rgba(255,255,255,.1);stroke-width:8;stroke-linecap:round}
.gauge .band{fill:none;stroke:url(#gg);stroke-width:8;stroke-linecap:round;transition:stroke-dasharray .8s var(--ease),stroke-dashoffset .8s var(--ease)}
.gauge text{font:500 10px "Geist Mono";fill:#7f98b0;letter-spacing:.06em}
.plan .wall{fill:none;stroke:rgba(150,210,255,.4);stroke-width:1.3}
.plan .ceil{fill:rgba(25,200,255,.05);stroke:rgba(150,210,255,.75);stroke-width:1.6}
.plan .flr{fill:rgba(7,17,31,.6);stroke:rgba(150,210,255,.35);stroke-width:1.2}
.planeWrap{background:radial-gradient(500px 300px at 50% 60%,rgba(25,200,255,.12),transparent 70%),linear-gradient(180deg,#0f2036,#0a1626)}
/* rail progress */
.guides{timeline-scope:--rail}
.rail{scroll-timeline:--rail inline}
.railprog{height:2px;background:var(--line);margin-top:8px;position:relative;border-radius:2px;overflow:hidden}
.railprog i{position:absolute;inset:0;background:linear-gradient(90deg,var(--cy),var(--bl));transform-origin:0 50%;transform:scaleX(.25)}
@supports (animation-timeline:scroll()){.railprog i{animation:rpg linear both;animation-timeline:--rail}@keyframes rpg{from{transform:scaleX(.2)}to{transform:scaleX(1)}}}
/* giant footer type */
.giant{font:800 clamp(30px,7.7vw,150px)/.9 Archivo;letter-spacing:-.05em;color:transparent;-webkit-text-stroke:1px rgba(150,210,255,.24);white-space:nowrap;text-align:center;margin-top:40px;-webkit-mask-image:linear-gradient(180deg,#000 20%,transparent 100%);mask-image:linear-gradient(180deg,#000 20%,transparent 100%);user-select:none;overflow:hidden}
footer{overflow:hidden}
footer .wrap{flex-wrap:wrap}
/* tab indicator */
.tabs{position:fixed}.tabs .ind{position:absolute;top:6px;bottom:6px;border-radius:16px;background:rgba(25,200,255,.14);box-shadow:inset 0 0 0 1px rgba(25,200,255,.25);transition:left .5s var(--ease),width .5s var(--ease);pointer-events:none}
.tabs a.on{background:none}.tabs a{position:relative;z-index:1}
/* sheet success */
.ok{width:64px;height:64px;margin:6px 0 14px}.ok circle{fill:none;stroke:rgba(25,200,255,.3);stroke-width:3}
.ok path{fill:none;stroke:var(--cy);stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:40;stroke-dashoffset:40;animation:tick .7s .15s var(--ease) forwards}
.ok circle.c2{stroke:var(--cy);stroke-dasharray:190;stroke-dashoffset:190;animation:tick .9s var(--ease) forwards}
@keyframes tick{to{stroke-dashoffset:0}}
.sheet label span{display:flex;justify-content:space-between}
@media(max-width:900px){.fanglow,.rays{left:auto;right:-30%;top:34%;width:110vw}.story .stn::before{top:-84px;font-size:130px}.giant{margin-top:24px}}
@media(prefers-reduced-motion:reduce){.intro{display:none}.fanglow,.rays{animation:none}}

/* final pass */
section:not(.hero):not(.story)+section::before,section.story+section::before{content:"";position:absolute;left:var(--g);right:var(--g);top:0;height:1px;background:linear-gradient(90deg,transparent,rgba(120,220,255,.38),transparent)}
@supports (animation-timeline:scroll()){.brand img{animation:rot linear both;animation-timeline:scroll(root)}@keyframes rot{to{transform:rotate(540deg)}}}
.legend{position:absolute;right:var(--g);top:84px;display:flex;gap:16px;z-index:3}
.legend span{display:inline-flex;align-items:center;gap:8px}.legend i{width:18px;height:2px;border-radius:2px;display:inline-block}
.tile .im::after{content:"";position:absolute;inset:0 -48px 0 0;background:repeating-linear-gradient(115deg,transparent 0 22px,rgba(25,200,255,.12) 22px 24px);opacity:0;transition:opacity .5s;animation:streak 1.6s linear infinite;pointer-events:none}
.tile:hover .im::after{opacity:1}@keyframes streak{to{transform:translateX(48px)}}
/* anatomy */
.anat .box{display:grid;grid-template-columns:.8fr 1.2fr;gap:20px}
.parts{display:grid;gap:10px;align-content:start}
.part{display:block;width:100%;text-align:left;cursor:pointer;padding:18px 20px;color:var(--ink);border:0;font:inherit}
.part h3{font-size:19px;display:flex;align-items:center;gap:10px;margin-bottom:4px}.part p{color:#a9bccf;font-size:14px;max-height:0;overflow:hidden;opacity:0;transition:max-height .6s var(--ease),opacity .4s}
.part.on p{max-height:90px;opacity:1}
.part.on{box-shadow:0 0 0 1px rgba(25,200,255,.55),0 24px 50px -26px rgba(25,200,255,.55),inset 0 1px 0 rgba(255,255,255,.08)}
.part .ico{width:28px;height:28px;font-size:15px;border-radius:9px}
.cvbox{position:relative;min-height:500px;overflow:hidden;background:radial-gradient(420px 320px at 50% 55%,rgba(25,200,255,.14),transparent 70%),linear-gradient(180deg,#0f2036,#0a1626)}
.cvbox::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(150,210,255,.2) 1px,transparent 1.3px);background-size:22px 22px;-webkit-mask-image:radial-gradient(60% 60% at 50% 50%,#000,transparent 80%);mask-image:radial-gradient(60% 60% at 50% 50%,#000,transparent 80%)}
#anat{position:absolute;inset:0;width:100%;height:100%}
.cvbox .mono{position:absolute;left:18px;bottom:14px;z-index:2}
.cvbox .lab{position:absolute;right:18px;top:16px;z-index:2;color:var(--cy)}
@media(max-width:900px){.anat .box{grid-template-columns:1fr}.cvbox{min-height:340px}.legend{display:none}}