:root{
  --bg:#050a0f;
  --panel:#08131d;
  --panel-2:#0b1823;
  --panel-3:#071018;
  --line:rgba(24,198,216,.26);
  --line-strong:rgba(24,198,216,.48);
  --ink:#edfafa;
  --muted:#9db7b8;
  --accent:#18c6d8;
  --accent-2:#9cf8ff;
  --warm:#e4cf87;
  --danger:#ffb1a8;
  --radius:20px;
  --font:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif
}
*{box-sizing:border-box}
html{min-height:100%;background:var(--bg);color-scheme:dark}
body{
  margin:0;min-height:100dvh;color:var(--ink);font-family:var(--font);
  background:radial-gradient(circle at 12% 0%,rgba(24,198,216,.12),transparent 28rem),linear-gradient(180deg,#05070d 0%,#050a0f 55%,#030609 100%);
}
button,input,select{font:inherit}
button{cursor:pointer}
a{color:var(--accent-2)}

.site-header{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:1rem;
  width:min(1420px,calc(100% - 32px));min-height:64px;margin:0 auto;
  padding:max(10px,env(safe-area-inset-top)) 0 10px;
  background:linear-gradient(180deg,rgba(5,10,15,.96),rgba(5,10,15,.78) 78%,transparent);
  backdrop-filter:blur(12px)
}
.brand{display:inline-flex;align-items:center;gap:.65rem;text-decoration:none;font-weight:900;letter-spacing:-.02em}
.brand-mark{
  display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--line-strong);border-radius:10px;
  background:rgba(24,198,216,.08);color:var(--accent)
}
.header-actions{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}
.art-return{display:inline-flex;align-items:center;min-height:44px;padding:.5rem .75rem;border:1px solid var(--line);border-radius:999px;color:var(--ink);font:900 .78rem/1 var(--font);text-decoration:none}
.art-return:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media(max-width:520px){.site-header{flex-wrap:wrap;gap:.25rem}.header-actions{width:100%;justify-content:flex-end}.art-return{margin-right:auto}}
.install-button,.header-button{
  min-height:38px;padding:.5rem .75rem;border:1px solid var(--line);border-radius:999px;
  color:var(--ink);background:#07121c;font:900 .78rem/1 var(--font)
}
.install-button.is-ready{color:#041217;background:linear-gradient(135deg,#8ef4ff,#c8faff)}
.install-button span+span{margin-left:.3rem}
.header-button{display:none}

.demo-stage{width:min(1420px,calc(100% - 32px));margin:0 auto;padding:10px 0 88px}
.lab-shell{
  min-height:calc(100dvh - 92px);
  display:grid;grid-template-columns:minmax(0,1fr) 360px;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(180deg,rgba(8,19,29,.78),rgba(4,10,16,.88));
  box-shadow:0 24px 70px rgba(0,0,0,.28)
}
.viewer-shell{position:relative;min-width:0;min-height:720px;background:#0b1016;overflow:hidden}
#gl{width:100%;height:100%;display:block;touch-action:none;background:#11161d}

.loading-card{
  position:absolute;inset:0;z-index:30;display:grid;place-content:center;justify-items:center;text-align:center;
  padding:2rem;background:radial-gradient(circle at 50% 40%,rgba(24,198,216,.12),transparent 18rem),rgba(4,8,12,.96);
  transition:opacity .25s
}
.loading-card.is-hidden{opacity:0;pointer-events:none}
.loading-mark{
  width:56px;height:56px;display:grid;place-items:center;border:1px solid var(--line-strong);
  border-radius:16px;color:var(--accent);font-size:1.6rem;background:rgba(24,198,216,.06);margin-bottom:.8rem
}
.loading-card strong{font-size:1.15rem}
.loading-card p{max-width:560px;margin:.45rem 0 1rem;color:var(--muted);font-size:.85rem;line-height:1.5}
.progress-track{width:min(420px,80vw);height:6px;border-radius:999px;background:#101a22;overflow:hidden;border:1px solid rgba(255,255,255,.05)}
.progress-track span{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--accent),#95fff6);transition:width .15s}
.loading-actions{display:flex;gap:.5rem;margin-top:1rem;flex-wrap:wrap;justify-content:center}
.secondary-button,.file-button{
  min-height:38px;padding:.55rem .8rem;border:1px solid var(--line);border-radius:999px;
  color:var(--ink);background:#07121c;font-weight:800;font-size:.78rem;text-decoration:none
}
.file-button{display:inline-grid;place-items:center;cursor:pointer}
#localStl{display:none}

.control-panel{
  overflow:auto;max-height:calc(100dvh - 92px);padding:18px;background:rgba(7,16,24,.97);
  border-left:1px solid var(--line)
}
.mobile-panel-backdrop,.mobile-drawer-head{display:none}
.panel-intro{padding:.15rem .15rem .8rem}
.eyebrow{margin:0 0 .4rem;color:var(--accent);font-size:.68rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}
.panel-intro h1{margin:0;font-size:1.42rem;line-height:1.08;letter-spacing:-.025em}
.panel-intro>p:last-child{margin:.65rem 0 0;color:var(--muted);font-size:.78rem;line-height:1.52}

details{border-top:1px solid var(--line)}
summary{
  list-style:none;display:flex;align-items:center;justify-content:space-between;gap:.6rem;
  padding:.85rem .15rem;cursor:pointer;color:#dff9f8;font-size:.72rem;font-weight:900;letter-spacing:.09em;text-transform:uppercase
}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--accent);font-size:1rem}
details[open] summary::after{content:"−"}
.panel-body{padding:0 .1rem 1rem}

.control-row{display:flex;gap:.5rem;margin:.55rem 0}
.control-row>button{flex:1}
button,.segmented button,.button-grid button{
  min-height:36px;padding:.45rem .58rem;border:1px solid rgba(24,198,216,.22);border-radius:9px;
  color:var(--ink);background:#07121c;font-size:.72rem;font-weight:800
}
button:hover,button:focus-visible{border-color:var(--accent);outline:none;background:#0b1c28}
button.is-active,[data-lock].is-active{background:rgba(24,198,216,.15);border-color:rgba(24,198,216,.65);color:#dffcff}
button.is-locked,[data-lock].is-locked{background:rgba(228,207,135,.12);border-color:rgba(228,207,135,.5);color:#fff3bf}

.button-grid{display:grid;gap:.45rem;margin:.4rem 0}
.button-grid.three{grid-template-columns:repeat(3,1fr)}
.button-grid.four{grid-template-columns:repeat(4,1fr)}
.segmented{display:grid;grid-template-columns:1fr 1fr;gap:.4rem;margin:.45rem 0}
.segmented button{min-height:34px}
label:not(.check){
  display:flex;align-items:center;justify-content:space-between;gap:.8rem;
  margin:.62rem 0 .25rem;color:#d5e6e5;font-size:.7rem;font-weight:700
}
output{color:var(--muted);font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.67rem}
input[type=range]{width:100%;accent-color:var(--accent)}
select{
  width:100%;min-height:38px;padding:.48rem .55rem;border:1px solid rgba(24,198,216,.23);
  border-radius:9px;background:#07121c;color:var(--ink);font-size:.73rem
}
.check-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.45rem}
.check{
  display:flex;align-items:center;gap:.4rem;padding:.5rem;border:1px solid rgba(24,198,216,.2);border-radius:9px;
  color:#d5e6e5;font-size:.7rem;background:#07121c
}
.check input{accent-color:var(--accent)}
.timer-display{
  margin:.55rem 0;padding:.65rem;border:1px solid var(--line);border-radius:10px;text-align:center;
  font:900 1.1rem/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;color:#dffcff;background:#050b11
}
.about-copy{color:var(--muted);font-size:.72rem;line-height:1.5}
.about-copy p{margin:.3rem 0 .65rem}
.version{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;color:#7fa1a3}

.viewer-toolbar{
  position:absolute;left:14px;top:14px;z-index:10;display:flex;gap:.35rem;padding:.3rem;
  border:1px solid rgba(24,198,216,.25);border-radius:999px;background:rgba(5,10,15,.8);backdrop-filter:blur(10px)
}
.viewer-toolbar button{
  min-height:32px;padding:.4rem .7rem;border-radius:999px;border:1px solid transparent;
  background:transparent;color:#c9d9da;font-size:.68rem;font-weight:900
}
.viewer-toolbar button.is-active{color:#041217;background:linear-gradient(135deg,#8ef4ff,#dffcff)}
.viewer-help{
  position:absolute;left:14px;bottom:14px;z-index:10;padding:.45rem .62rem;border-radius:8px;
  background:rgba(5,10,15,.74);color:#b8c8c9;font-size:.66rem;backdrop-filter:blur(8px)
}
.mode-pill{
  position:absolute;right:14px;top:14px;z-index:10;padding:.4rem .55rem;border-radius:999px;
  border:1px solid rgba(24,198,216,.28);background:rgba(5,10,15,.78);color:#bfeef0;font-size:.6rem;font-weight:900;letter-spacing:.12em
}
.reference-lock{
  position:absolute;left:50%;top:14px;transform:translateX(-50%);z-index:12;padding:.45rem .7rem;
  border:1px solid rgba(228,207,135,.48);border-radius:999px;background:rgba(35,30,14,.82);
  color:#fff0b5;font-size:.62rem;font-weight:900;letter-spacing:.11em;backdrop-filter:blur(8px)
}
.light-marker{
  position:absolute;z-index:11;pointer-events:none;display:flex;align-items:center;gap:.38rem;
  transform:translate(9px,-50%);font-size:.58rem;font-weight:900;color:#ffe897;text-shadow:0 1px 3px #000
}
.light-marker span{
  width:11px;height:11px;border-radius:50%;background:#ffd84d;box-shadow:0 0 12px rgba(255,216,77,.85)
}

.crop-layer{position:absolute;inset:0;z-index:8;pointer-events:none}
.crop-frame{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  border:1px solid rgba(255,255,255,.82);box-shadow:0 0 0 9999px rgba(0,0,0,.18);
  overflow:hidden
}
.format-badge{
  position:absolute;right:14px;bottom:14px;padding:.4rem .55rem;border-radius:7px;
  background:rgba(5,10,15,.72);color:#e7f1f0;font-size:.6rem;font-weight:800;backdrop-filter:blur(8px)
}
.guide{position:absolute;opacity:.45;background:rgba(255,255,255,.72)}
.guide-v-half,.guide-v-third{top:0;bottom:0;width:1px}
.guide-h-half,.guide-h-third{left:0;right:0;height:1px}
.guide-v-half{left:50%}.guide-h-half{top:50%}
.guide-v-third.a{left:33.333%}.guide-v-third.b{left:66.666%}
.guide-h-third.a{top:33.333%}.guide-h-third.b{top:66.666%}
.guide-diag{height:1px;left:50%;top:50%;width:142%;transform-origin:center;background:rgba(255,255,255,.58)}
.guide-diag.d1{transform:translate(-50%,-50%) rotate(45deg)}
.guide-diag.d2{transform:translate(-50%,-50%) rotate(-45deg)}
.guide-diag.d3,.guide-diag.d4{display:none}

.viewer-shell.paint-mode .viewer-toolbar,
.viewer-shell.paint-mode .viewer-help{opacity:0;pointer-events:none}
.viewer-shell.paint-mode{cursor:none}
body.paint-mode .site-header,
body.paint-mode .control-panel,
body.paint-mode .doi-pill,
body.paint-mode .demo-return-pill,
body.paint-mode .demo-support-widget{display:none!important}
body.paint-mode .demo-stage{width:100%;padding:0}
body.paint-mode .lab-shell{display:block;min-height:100dvh;border:0;border-radius:0}
body.paint-mode .viewer-shell{height:100dvh;min-height:100dvh}
body.paint-mode .mode-pill{right:10px;top:10px}
body.paint-mode .reference-lock{top:10px}

.install-dialog{
  width:min(500px,calc(100% - 24px));max-height:calc(100dvh - 24px);padding:0;
  border:1px solid var(--line);border-radius:20px;color:var(--ink);background:#0b1620;box-shadow:0 30px 90px rgba(0,0,0,.64)
}
.install-dialog::backdrop{background:rgba(0,0,0,.68);backdrop-filter:blur(5px)}
.install-dialog form{position:relative;padding:1.2rem}
.install-dialog h2{margin:.2rem 0 0;padding-right:2rem;font-size:1.35rem}
.dialog-close{
  position:absolute;top:.65rem;right:.65rem;display:grid;place-items:center;width:38px;height:38px;padding:0;
  border:1px solid var(--line);border-radius:999px;color:var(--ink);background:#07121c;font-size:1.2rem
}
.install-instructions{margin-top:.9rem;padding:.8rem;border:1px solid var(--line);border-radius:14px;background:rgba(5,10,15,.5);color:var(--muted);font-size:.82rem}
.dialog-actions{display:flex;justify-content:flex-end;margin-top:.9rem}
.primary-button{min-height:38px;padding:.55rem .85rem;border:0;border-radius:999px;background:linear-gradient(135deg,#8ef4ff,#dffcff);color:#041217;font-weight:900}

.doi-pill{
  position:fixed;right:12px;bottom:calc(12px + env(safe-area-inset-bottom));z-index:9999;
  display:flex;align-items:center;gap:7px;padding:7px 9px;border:1px solid rgba(24,198,216,.42);
  border-radius:999px;color:var(--ink);background:rgba(5,10,15,.86);backdrop-filter:blur(10px);
  text-decoration:none;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:10px;font-weight:900;
  box-shadow:0 10px 30px rgba(0,0,0,.28)
}
.doi-pill b{padding:2px 5px;border-radius:5px;color:#031015;background:#dffcff;font:900 8px/1 var(--font)}
.doi-pill.is-placeholder{opacity:.82}

@media(max-width:1000px){
  .lab-shell{grid-template-columns:minmax(0,1fr) 330px}
  .control-panel{padding:14px}
}
@media(max-width:780px){
  .site-header,.demo-stage{width:calc(100% - 16px)}
  .site-header{
    min-height:54px;padding:max(7px,env(safe-area-inset-top)) 0 7px
  }
  .header-button{display:block}
  .demo-stage{padding-top:4px;padding-bottom:72px}
  .lab-shell{
    display:block;position:relative;min-height:calc(100dvh - 70px);
    border-radius:16px
  }
  .viewer-shell{
    height:calc(100dvh - 76px);min-height:560px;width:100%
  }

  .mobile-panel-backdrop{
    position:fixed;inset:0;z-index:10020;display:block;border:0;padding:0;
    background:rgba(0,0,0,.58);backdrop-filter:blur(2px)
  }
  .mobile-panel-backdrop[hidden]{display:none!important}

  .control-panel{
    position:fixed;left:8px;right:8px;bottom:calc(8px + env(safe-area-inset-bottom));top:auto;
    z-index:10030;width:auto;max-height:min(74dvh,680px);padding:0 14px calc(14px + env(safe-area-inset-bottom));
    overflow:auto;overscroll-behavior:contain;border:1px solid var(--line-strong);border-radius:22px 22px 16px 16px;
    background:rgba(7,16,24,.985);box-shadow:0 -18px 70px rgba(0,0,0,.62);backdrop-filter:blur(18px);
    animation:mobileDrawerIn .16s ease-out
  }
  .control-panel.is-hidden{display:none!important}
  .mobile-drawer-head{
    position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:1rem;
    min-height:58px;margin:0 -14px .2rem;padding:9px 12px 8px 15px;
    border-bottom:1px solid var(--line);background:rgba(7,16,24,.98);backdrop-filter:blur(18px)
  }
  .mobile-drawer-head>div{display:grid;gap:2px}
  .mobile-drawer-head strong{font-size:.92rem}
  .mobile-drawer-kicker{color:var(--accent);font-size:.6rem;font-weight:900;letter-spacing:.11em;text-transform:uppercase}
  .mobile-drawer-close{
    flex:0 0 44px;width:44px;height:44px;min-height:44px;padding:0;border-radius:999px;font-size:1.25rem
  }

  body.mobile-controls-open{overflow:hidden}
  body.mobile-controls-open .doi-pill,
  body.mobile-controls-open .demo-return-pill,
  body.mobile-controls-open .demo-support-widget{display:none!important}

  .control-panel .panel-intro{padding:.45rem .1rem .75rem}
  .control-panel .panel-intro h1{font-size:1.18rem}
  .control-panel details{scroll-margin-top:62px}
  .control-panel summary{min-height:48px;padding:.82rem .15rem;font-size:.73rem}
  .control-panel button,
  .control-panel select{min-height:44px}
  .control-panel .segmented button,
  .control-panel .button-grid button{min-height:44px}
  .control-panel input[type=range]{height:32px}
  .button-grid.four{grid-template-columns:repeat(2,1fr)}
  .check-grid{grid-template-columns:1fr}
  .check{min-height:44px}

  .viewer-toolbar{left:8px;top:8px}
  .viewer-toolbar button{min-height:36px;padding:.42rem .62rem}
  .viewer-help{
    left:8px;top:54px;bottom:auto;max-width:72%;padding:.38rem .48rem;font-size:.6rem
  }
  .mode-pill{display:none}
  .format-badge{right:8px;bottom:92px;font-size:.56rem}
  .doi-pill{
    right:8px;bottom:calc(8px + env(safe-area-inset-bottom));max-width:calc(100vw - 116px);
    font-size:9px;padding:6px 8px
  }
  .doi-pill span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .build-pill{right:8px!important;top:8px!important;font-size:.52rem;padding:.3rem .42rem}

  @keyframes mobileDrawerIn{
    from{transform:translateY(18px);opacity:0}
    to{transform:translateY(0);opacity:1}
  }
}
@media(max-width:520px){
  .brand span:last-child{font-size:.9rem}
  .header-actions{gap:.35rem}
  .header-button,.install-button{min-height:34px;padding:.42rem .58rem;font-size:.7rem}
  .viewer-toolbar button{padding:.35rem .5rem;font-size:.62rem}
  .format-badge{right:8px;bottom:8px}
}

.build-pill{
  position:absolute;right:14px;top:52px;z-index:10;padding:.35rem .5rem;border-radius:999px;
  border:1px solid rgba(228,207,135,.38);background:rgba(5,10,15,.78);
  color:#f0dda0;font:900 .58rem/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  letter-spacing:.06em;backdrop-filter:blur(8px)
}
body.paint-mode .build-pill{right:10px;top:44px}
@media(max-width:780px){
  .build-pill{right:8px;top:8px}
}