:root{color-scheme:dark;--bg:#081120;--panel:#111c2d;--stroke:#26384a;--mint:#52e3fa;--sub:#a3b8c8}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#f0f5f9;font:15px system-ui,-apple-system,sans-serif}header{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--stroke);padding:16px clamp(18px,4vw,56px);position:sticky;top:0;background:#081120eb;backdrop-filter:blur(12px);z-index:3}.brand{color:inherit;text-decoration:none;font-size:13px;letter-spacing:.09em}.brand span,.muted,.hint{color:var(--sub)}nav{display:flex;gap:6px}button{cursor:pointer;border:1px solid var(--stroke);border-radius:10px;padding:12px 15px;background:#17263a;color:#eff5f8;font-weight:650}button.selected,.primary{background:var(--mint);color:#071641;border-color:var(--mint)}.status{font-size:10px;letter-spacing:.14em;color:var(--mint)}main{max-width:1250px;margin:auto;padding:34px clamp(18px,4vw,56px)}h1{font-size:clamp(33px,5vw,68px);line-height:1.08;letter-spacing:-.045em;margin:12px 0 22px}h1 em{font-style:normal;color:var(--mint)}h2{font-size:22px}h3{font-size:19px}.eyebrow{color:var(--mint);font-size:11px;letter-spacing:.19em;font-weight:800}.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:60px 0 76px}.lead{max-width:600px;font-size:19px;line-height:1.7;color:#b8c7d6}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:32px 0 15px}.actions a{padding:13px 17px;text-decoration:none;border-radius:10px;font-weight:750}.actions [aria-disabled=true]{opacity:.52;pointer-events:none}.hint{font-size:12px;line-height:1.5}.visual{min-height:310px;border-radius:24px;border:1px solid #1b4670;background:radial-gradient(circle at 50% 48%,#1b5d8966,transparent 60%),linear-gradient(145deg,#132b41,#0b1523);position:relative;overflow:hidden;display:grid;place-items:center}.orb{width:150px;height:150px;border-radius:40% 60% 58% 42%;background:linear-gradient(120deg,#52e3fa,#176a8c);filter:drop-shadow(0 0 40px #3fc8f099);transform:rotate(-23deg)}.visualLabel{position:absolute;bottom:20px;left:22px;font-size:13px;letter-spacing:.13em;font-weight:800}.visualLabel span{display:block;color:#a9c9df;font-size:11px;letter-spacing:0;font-weight:400;margin-top:7px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:24px 0 55px}.cards article,.pane,.metrics article,.project,.login{border:1px solid var(--stroke);background:var(--panel);border-radius:17px;padding:23px}.cards article span{color:var(--mint);font-size:11px}.cards p,.project p{color:var(--sub);line-height:1.7}.project{display:flex;align-items:center;justify-content:space-between;gap:30px;background:linear-gradient(110deg,#12304f,#101b2c)}footer{color:var(--sub);font-size:12px;padding:35px 0}.workspaceHead{display:flex;align-items:center;justify-content:space-between;gap:20px}.workspaceHead h1{font-size:clamp(30px,4vw,47px)}.chip{border:1px solid var(--stroke);border-radius:30px;padding:10px;font-size:12px;color:var(--mint)}input{border:1px solid #3a5369;border-radius:9px;padding:13px;background:#071321;color:white;min-width:0;font:inherit;flex:1}label{display:block;margin-bottom:12px}.loginRow,.pane form{display:flex;gap:8px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}.metrics article strong{font-size:34px;display:block;color:var(--mint)}.metrics article span{color:var(--sub);font-size:12px}.workspaceGrid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.paneTitle{display:flex;align-items:center;justify-content:space-between}.paneTitle span{font-size:10px;color:var(--mint)}.list{display:grid;gap:8px;margin:14px 0;max-height:340px;overflow:auto}.list>div{border:1px solid #203247;border-radius:10px;padding:12px;color:#d2deea;overflow-wrap:anywhere}.list small{display:block;margin-top:6px;color:var(--sub)}.featureList>div{font-size:13px}.textLink{color:var(--mint)}.bottomActions{display:flex;gap:8px;margin:22px 0}#notice{color:var(--mint)}[hidden]{display:none!important}@media(max-width:850px){header{flex-wrap:wrap}.status{display:none}.hero,.workspaceGrid{grid-template-columns:1fr}.hero{padding:24px 0}.visual{min-height:230px}.cards{grid-template-columns:1fr}.project{display:block}.project button{margin-top:12px}.metrics{grid-template-columns:1fr 1fr}.pane{padding:15px}}
/* HUAIDEV public presentation only; owner workspace retains existing styles */
html{scroll-behavior:smooth;scroll-padding-top:100px}.skip{position:absolute;left:-999px;top:4px}.skip:focus{left:10px;z-index:10;background:white;color:black;padding:12px}header .brand{display:flex;align-items:center;gap:9px}.brand strong{letter-spacing:.16em}header nav a{display:inline-block;text-decoration:none;color:#cfdef0;padding:10px;border-radius:9px;font-size:13px}header nav a:hover,header nav a:focus-visible{background:#20344b;color:white}header nav .workspaceLink{border:1px solid #326d84;color:#8ef0ff}.heroArt{border:1px solid #235a6a;background:radial-gradient(circle at center,#1b4670,#071527 75%);border-radius:24px;min-height:350px;display:grid;place-items:center;padding:18px;text-align:center}.heroArt img{width:min(80%,290px);background:white;border-radius:22px;padding:18px;box-shadow:0 15px 55px #0007}.heroArt p{color:#b9d8e4;font-size:12px;letter-spacing:.07em}.section{padding:36px 0 28px;border-top:1px solid #24394c}.sectionIntro{max-width:780px}.sectionIntro>p:not(.eyebrow){color:var(--sub);line-height:1.7;font-size:17px}.sectionIntro h2{font-size:clamp(26px,3vw,38px)}.hero{padding:55px 0 67px}.hero h1{max-width:750px}.subtleButton{color:#dbf8fa;background:#1b3044;border:1px solid #365367}.projectTiles{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:25px 0}.projectTiles article{background:#111f33;border:1px solid #2a3f58;border-radius:16px;padding:24px}.projectTiles article span,.process b{font-size:11px;letter-spacing:.11em;color:var(--mint)}.projectTiles article p,.process p{color:var(--sub);line-height:1.65}.projectTiles article a{color:var(--mint)}.process{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:25px 0}.process>div{border-top:2px solid #16b6dd;padding:20px;background:#101f32}.process strong{display:block;margin:14px 0;font-size:18px}.callout{margin:42px 0}.callout a{border-radius:10px;padding:14px 17px;text-decoration:none;font-weight:700;white-space:nowrap}footer{border-top:1px solid #274055;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}@media(max-width:850px){header nav{display:flex;flex-wrap:wrap;gap:1px}header nav a{font-size:12px;padding:8px}.projectTiles,.process{grid-template-columns:1fr}.heroArt{min-height:280px}.callout a{display:inline-block}.hero{gap:20px}}

.mathExpression{font-size:clamp(17px,2vw,22px);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.45;color:#9ce7f1;overflow-wrap:anywhere}.mathNote{color:#a8bccf;line-height:1.55;display:block}.mathPolicy{margin:23px 0}.mathPolicy h3{font-size:19px}

/* Official owner-approved HUAIDEV raster artwork, no redrawn substitute */
.brandOfficial{display:inline-flex;align-items:center;gap:9px;white-space:nowrap;letter-spacing:.15em;font-size:clamp(12px,1.1vw,17px)}.brandIcon{background:#fff;border-radius:50%;width:39px;height:39px;display:grid;place-items:center;flex:0 0 auto;overflow:hidden}.brandIcon img{width:34px;height:34px;object-fit:contain}.officialBrandLockup{background:#fff;border-radius:16px;display:flex;align-items:center;flex-direction:column;justify-content:center;padding:clamp(24px,4vw,46px);max-width:470px;width:100%;margin:auto;gap:12px;box-shadow:0 14px 55px #02091480}.officialMark{width:min(75%,260px);height:auto;max-height:260px;object-fit:contain}.officialWordmark{display:block;font-weight:800;letter-spacing:.32em;text-indent:.32em;font-size:clamp(26px,6.4vw,44px);line-height:1.1;color:#0b1f4d}.footerOfficial{display:inline-flex;align-items:center;gap:8px;color:#f4f9ff;text-decoration:none;letter-spacing:.14em}.footerOfficial img{padding:3px;background:white;border-radius:50%;object-fit:contain}.heroArt{min-width:0}@media(max-width:600px){.brandOfficial strong{font-size:11px}.brandIcon{width:32px;height:32px}.brandIcon img{width:27px;height:27px}.officialBrandLockup{padding:18px}.footerOfficial strong{font-size:11px}}

/* tablet widths: the hero lockup keeps inside its column (the site frame takes 2 x 12px) */
@media (min-width:851px) and (max-width:1180px){.officialWordmark{font-size:clamp(22px,3.3vw,38px)}.officialBrandLockup{padding:clamp(20px,3vw,40px)}}
[hidden]{display:none!important}
html.pending body>*:not(.langGate){visibility:hidden}
.langSwitch{display:inline-flex;gap:4px}.langSwitch button{padding:6px 10px;border-radius:8px;font-size:12px;letter-spacing:.08em}.langSwitch button[aria-pressed=true]{background:var(--mint);color:#071641;border-color:var(--mint)}
.langGate{position:fixed;inset:0;z-index:100;display:grid;place-items:center;background:rgba(6,14,28,.5);-webkit-backdrop-filter:blur(22px) saturate(1.2);backdrop-filter:blur(22px) saturate(1.2);animation:gateIn 1.1s ease-out both;transition:opacity .35s ease}
.langGate.leaving{opacity:0;pointer-events:none;transition:opacity .9s ease .1s}
.gateInner{display:flex;flex-direction:column;align-items:center;gap:28px;padding:24px;text-align:center}
.bigFlag{width:min(66vh,82vw);aspect-ratio:2/1;padding:0;border:0;border-radius:10px;overflow:hidden;background:none;cursor:pointer;box-shadow:0 18px 60px rgba(0,0,0,.45);animation:flagPulse 4.6s ease-in-out infinite}
.bigFlag svg,.choice svg{display:block;width:100%;height:100%}
.bigFlag:focus-visible,.choice:focus-visible{outline:4px solid #fff;outline-offset:6px}
.gateChoices{display:flex;flex-wrap:wrap;gap:clamp(18px,4vw,40px);justify-content:center}
.choice{display:flex;flex-direction:column;align-items:center;gap:12px;background:none;border:0;padding:8px;color:#fff;font-size:18px;font-weight:700;cursor:pointer}
.choice svg{width:min(34vw,200px);height:auto;border-radius:8px;box-shadow:0 12px 40px rgba(0,0,0,.45);transition:transform .25s}
.choice:hover svg,.choice:focus-visible svg{transform:scale(1.06)}
.gateHint{margin:0;color:#dbe8f2;font-size:clamp(14px,2.2vw,18px);line-height:1.6}
@keyframes flagPulse{0%,100%{transform:scale(1);box-shadow:0 18px 60px rgba(0,0,0,.45),0 0 0 0 rgba(126,231,213,0)}50%{transform:scale(1.045);box-shadow:0 22px 80px rgba(0,0,0,.5),0 0 90px 8px rgba(126,231,213,.38)}}
@keyframes gateIn{from{opacity:0}to{opacity:1}}
@media (prefers-reduced-motion:reduce){.bigFlag{animation:none}.langGate{animation:none;transition:none}.choice svg{transition:none}}

/* Language wheel (owner 2026-10-24): a 3D drum of flags; the language of the middle flag written out above it, large */
.langGate .gateInner{flex-direction:column;align-items:center;justify-content:center;gap:clamp(14px,3vh,30px);padding:24px max(18px,env(safe-area-inset-right)) 24px max(18px,env(safe-area-inset-left));width:100%}
.wheelName{margin:0;width:100%;height:1.2em;font-size:clamp(30px,8vw,56px);line-height:1.2;font-weight:780;letter-spacing:-.015em;text-align:center;white-space:nowrap;color:#fff;text-shadow:0 2px 22px rgba(0,0,0,.4)}
.wheel{--wheel-item:100px;position:relative;flex:0 0 auto;width:150px;height:min(440px,52vh);perspective:520px;overflow:hidden;-webkit-mask-image:linear-gradient(transparent,#000 17%,#000 83%,transparent);mask-image:linear-gradient(transparent,#000 17%,#000 83%,transparent);touch-action:none;cursor:grab;outline:none;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}
.wheel:active{cursor:grabbing}
.wheelBand{position:absolute;left:0;right:0;top:50%;height:calc(var(--wheel-item) + 10px);transform:translateY(-50%);border-radius:14px;background:rgba(82,227,250,.07);border:1px solid rgba(82,227,250,.6);box-shadow:0 0 26px rgba(22,182,221,.35),inset 0 0 18px rgba(82,227,250,.12);pointer-events:none}
.wheel:focus-visible .wheelBand{border-color:#fff;box-shadow:0 0 0 3px rgba(255,255,255,.85),0 0 26px rgba(22,182,221,.5)}
.wheelDrum{position:absolute;left:0;right:0;top:50%;height:0;transform-style:preserve-3d}
.wheelItem{position:absolute;left:50%;top:0;width:112px;height:var(--wheel-item);margin:calc(var(--wheel-item) / -2) 0 0 -56px;display:grid;place-items:center;-webkit-backface-visibility:hidden;backface-visibility:hidden}
.wheelItem img{display:block;width:104px;height:78px;border-radius:6px;box-shadow:0 6px 18px rgba(0,0,0,.45),0 0 0 1px rgba(255,255,255,.18);pointer-events:none}
.wheelGo{min-width:200px;border:0;border-radius:999px;padding:13px 22px;background:#16b6dd;color:#fff;font-size:16px;font-weight:750;box-shadow:0 10px 30px rgba(22,182,221,.35)}
.wheelGo:focus-visible{outline:3px solid #fff;outline-offset:3px}
@media (max-width:420px){.wheel{--wheel-item:78px;width:112px;perspective:400px}.wheelItem{width:84px;margin-left:-42px}.wheelItem img{width:76px;height:57px}}
/* page locked behind the open language wheel (owner 2026-10-25) */
.gateLock,.gateLock body{overflow:hidden;overscroll-behavior:none}.langGate{overscroll-behavior:contain;touch-action:none}