:root{
  --concrete:#D5D9DC; --concrete-2:#C6CBCF; --chalk:#F8F8F6; --graphite:#23272B;
  --pencil:#626A73; --tape:#F0B90B; --tape-ink:#2A2200; --line:rgba(35,39,43,.14);
  --danger:#B3261E; --shadow:0 6px 24px rgba(30,34,38,.18);
  --font:'Barlow',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --cond:'Barlow Condensed','Barlow',system-ui,sans-serif;
  --safe-t:env(safe-area-inset-top,0px); --safe-b:env(safe-area-inset-bottom,0px);
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){:root{
  --concrete:#1B1F22; --concrete-2:#24292D; --chalk:#2A2F34; --graphite:#ECEDEE;
  --pencil:#9DA4AC; --line:rgba(255,255,255,.12); --shadow:0 6px 24px rgba(0,0,0,.45);
}}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font-family:var(--font);font-size:16px;line-height:1.4;background:var(--concrete);color:var(--graphite);
  overflow:hidden;-webkit-tap-highlight-color:transparent;font-variant-numeric:tabular-nums}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--tape);outline-offset:2px}
svg.i{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
[hidden]{display:none!important}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 16px;border-radius:10px;
  border:1px solid var(--line);background:var(--chalk);font-weight:500}
.btn.pri{background:var(--graphite);color:var(--concrete);border-color:transparent}
.btn.wide{width:100%}
.btn.danger{color:var(--danger)}
.ib{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:10px;border:0;background:transparent}
.ib:disabled{opacity:.35}
.ib.on{background:var(--tape);color:var(--tape-ink)}

/* ---------- home ---------- */
#home{height:100%;overflow:auto;padding:calc(20px + var(--safe-t)) 20px calc(32px + var(--safe-b))}
.hwrap{max-width:1100px;margin:0 auto}
.hhead{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.brand{font-family:var(--cond);font-weight:700;font-size:44px;letter-spacing:.01em;line-height:1;margin:0;
  background:var(--tape);color:var(--tape-ink);padding:6px 14px 4px;transform:skewX(-6deg)}
.brand span{display:inline-block;transform:skewX(6deg)}
.hact{display:flex;gap:8px}
.lede{color:var(--pencil);margin:14px 0 24px;max-width:46ch}
#cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.card{position:relative;background:var(--chalk);border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.copen{display:block;width:100%;padding:0;border:0;background:none;text-align:left}
.thumb{position:relative;aspect-ratio:4/3;background:var(--concrete-2);display:grid;place-items:center;color:var(--pencil)}
.thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.cmeta{padding:10px 44px 12px 12px}
.cmeta h2{font-size:17px;font-weight:600;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cmeta span{font-size:14px;color:var(--pencil)}
.cmore{position:absolute;right:4px;bottom:6px}
.empty{color:var(--pencil);padding:40px 0;max-width:40ch}

/* ---------- editor ---------- */
#editor{position:fixed;inset:0}
#topbar{position:absolute;left:0;right:0;top:0;height:calc(56px + var(--safe-t));padding:var(--safe-t) 6px 0;display:flex;align-items:center;gap:2px;
  background:var(--concrete);border-bottom:1px solid var(--line);z-index:5}
#title{flex:1;min-width:0;border:0;background:none;text-align:left;font-family:var(--cond);font-weight:600;font-size:22px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 6px;min-height:44px}
#status{font-size:13px;color:var(--pencil);padding:0 6px;white-space:nowrap}
#wrap{position:absolute;left:0;right:0;bottom:0;top:calc(56px + var(--safe-t));display:grid;place-items:center;overflow:hidden;
  background:radial-gradient(120% 90% at 50% 35%,var(--concrete) 0%,var(--concrete-2) 100%)}
#stage{position:relative;overflow:hidden}
#stage canvas{position:absolute;inset:0;display:block;touch-action:none;outline:none}
#bgimg{position:absolute;inset:0;width:100%;height:100%;object-fit:fill;pointer-events:none;user-select:none}
#zoomReset{position:absolute;top:58px;right:10px;z-index:3;min-height:38px;box-shadow:var(--shadow)}
#dim{position:absolute;z-index:2;left:0;top:0;pointer-events:none;background:var(--tape);color:var(--tape-ink);font-weight:600;font-size:14px;
  padding:3px 9px;white-space:nowrap;box-shadow:0 1px 0 rgba(0,0,0,.25);border-radius:2px}
#dim i{font-style:normal;font-weight:400;opacity:.7;margin:0 8px 0 2px}
#dim i:last-child{margin-right:0}

#toolbar{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(12px + var(--safe-b));display:flex;gap:2px;padding:4px;
  background:var(--chalk);border-radius:16px;box-shadow:var(--shadow);z-index:6;border:1px solid var(--line)}
#toolbar button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-width:58px;height:54px;border:0;
  border-radius:12px;background:transparent;font-size:12px;font-weight:500;color:var(--pencil)}
#toolbar button.on{background:var(--graphite);color:var(--concrete)}
#ctx{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(84px + var(--safe-b));max-width:calc(100% - 16px);display:flex;align-items:center;gap:2px;
  padding:4px;background:var(--chalk);border-radius:14px;box-shadow:var(--shadow);z-index:6;overflow-x:auto;scrollbar-width:none;border:1px solid var(--line)}
#ctx::-webkit-scrollbar{display:none}
#ctx .sep{width:1px;align-self:stretch;margin:6px 4px;background:var(--line);flex:none}
.seg{display:flex;background:var(--concrete-2);border-radius:10px;padding:2px;gap:2px;flex:none}
.seg button{border:0;background:transparent;border-radius:8px;min-width:42px;height:40px;display:grid;place-items:center;padding:0 10px;font-weight:500}
.seg button.on{background:var(--chalk);box-shadow:0 1px 3px rgba(0,0,0,.15)}
#ctx .ib.danger{color:var(--danger)}
#ctx .cnt{padding:0 10px 0 8px;font-weight:600;white-space:nowrap}
#ctx .btn.sm{min-height:40px;padding:0 12px;flex:none}

/* panel: bottom sheet on narrow screens, side panel on wide */
#panel{position:fixed;z-index:8;background:var(--chalk);box-shadow:var(--shadow);display:flex;flex-direction:column;
  left:0;right:0;bottom:0;max-height:min(52dvh,520px);border-radius:18px 18px 0 0;padding-bottom:var(--safe-b);border:1px solid var(--line)}
.ph{display:flex;align-items:center;gap:8px;padding:6px 6px 0 18px;flex:none}
.ph h2{flex:1;margin:0;font-family:var(--cond);font-weight:600;font-size:22px}
.pb{overflow:auto;padding:6px 18px 20px;overscroll-behavior:contain}
body.sheet #toolbar, body.sheet #ctx{display:none}
@media (min-width:760px){
  #panel{left:auto;right:12px;top:calc(68px + var(--safe-t));bottom:calc(12px + var(--safe-b));width:340px;max-height:none;border-radius:16px;padding-bottom:0}
  body.sheet #toolbar, body.sheet #ctx{display:flex}
  body.sheet #toolbar, body.sheet #ctx{left:calc(50% - 176px)}
}
.grp{padding:14px 0;border-top:1px solid var(--line)}
.grp:first-child{border-top:0;padding-top:4px}
.grp h3{margin:0 0 10px;font-size:15px;font-weight:600}
.hint{color:var(--pencil);font-size:14px;margin:0 0 10px}
.row{display:flex;gap:8px;flex-wrap:wrap}
.row>.btn{flex:1 1 auto}
.f3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.fld{display:flex;align-items:center;gap:6px;background:var(--concrete-2);border-radius:10px;padding:0 0 0 10px;min-height:44px}
.fld span{font-size:13px;color:var(--pencil);font-weight:600;min-width:12px}
.fld input{flex:1;min-width:0;width:100%;border:0;background:transparent;height:44px;padding:0 8px 0 0;font-variant-numeric:tabular-nums}
.fld input:focus{outline:none}
.fld:focus-within{box-shadow:inset 0 0 0 2px var(--tape)}
.tin{width:100%;height:46px;border-radius:10px;border:1px solid var(--line);background:var(--concrete-2);padding:0 12px}
.tog{display:flex;align-items:center;justify-content:space-between;min-height:46px;gap:12px}
.tog input{appearance:none;width:46px;height:28px;border-radius:14px;background:var(--concrete-2);position:relative;border:1px solid var(--line);flex:none;margin:0}
.tog input::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:var(--pencil);transition:transform .15s}
.tog input:checked{background:var(--tape)}
.tog input:checked::after{transform:translateX(18px);background:var(--tape-ink)}
.rng{display:grid;grid-template-columns:1fr auto;align-items:center;gap:4px 12px;margin:4px 0 8px}
.rng label{font-size:14px}
.rng output{font-size:14px;color:var(--pencil)}
.rng input{grid-column:1/-1;width:100%;accent-color:var(--tape);height:28px;margin:0}
.swatches{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.sw{width:36px;height:36px;border-radius:50%;border:2px solid var(--chalk);box-shadow:0 0 0 1px var(--line)}
.sw.on{box-shadow:0 0 0 2px var(--graphite)}
.swpick{position:relative;width:36px;height:36px;border-radius:50%;overflow:hidden;box-shadow:0 0 0 1px var(--line);
  background:conic-gradient(#e66,#ec6,#6c6,#6cc,#66e,#c6c,#e66)}
.swpick input{position:absolute;inset:-8px;opacity:0;width:60px;height:60px;cursor:pointer}
.shapes{display:grid;grid-template-columns:repeat(auto-fill,minmax(84px,1fr));gap:8px;margin-bottom:14px}
.shape{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 4px 10px;border-radius:12px;border:1px solid var(--line);background:var(--concrete-2);font-size:13px;font-weight:500}
.shape svg{width:40px;height:40px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linejoin:round}
.f2{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.f2 .fld span{min-width:auto;white-space:nowrap}
.clist{display:flex;flex-direction:column;gap:2px}
.crow{display:flex;align-items:baseline;justify-content:space-between;gap:12px;min-height:44px;padding:8px 10px;border:0;border-radius:10px;background:none;text-align:left}
.crow:hover,.crow:focus-visible{background:var(--concrete-2)}
.crow b{font-weight:500}
.crow small{color:var(--pencil);font-size:13px;white-space:nowrap}
.prow{display:grid;grid-template-columns:96px 1fr;align-items:center;gap:8px;padding:6px 0}
.prow>span{font-size:14px}
.prow .pt{grid-column:2}
.prow .pt .fsel{min-height:40px}
.swatches.sm{gap:6px}
.swatches.sm .sw,.swatches.sm .swpick{width:28px;height:28px}
.fsel{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:46px}
.fsel select{min-height:40px;border-radius:10px;border:1px solid var(--line);background:var(--concrete-2);padding:0 10px;max-width:60%}
.guide{margin-top:12px}
.gtopic{border-top:1px solid var(--line)}
.gtopic summary{min-height:46px;display:flex;align-items:center;font-weight:600;cursor:pointer;list-style:none}
.gtopic summary::-webkit-details-marker{display:none}
.gtopic summary::after{content:"+";margin-left:auto;color:var(--pencil);font-weight:400;font-size:20px}
.gtopic[open] summary::after{content:"–"}
.gtopic ol{margin:0 0 12px;padding-left:22px;color:var(--graphite)}
.gtopic li{margin:4px 0;font-size:15px}
.olist{list-style:none;margin:0;padding:0}
.olist li{display:flex;align-items:center;border-radius:10px}
.olist li.on{background:var(--concrete-2)}
.olist li.off .oname{opacity:.45}
.oname{flex:1;min-width:0;display:flex;align-items:center;gap:10px;border:0;background:none;min-height:46px;text-align:left;padding:0 8px}
.oname b{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.oname small{color:var(--pencil);margin-left:auto;padding-left:8px}
.dot{width:14px;height:14px;border-radius:4px;flex:none;box-shadow:inset 0 0 0 1px rgba(0,0,0,.15)}
.phthumb{width:100%;max-height:160px;object-fit:contain;border-radius:10px;background:var(--concrete-2);display:block;margin-bottom:10px}
.xbtn{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:10px 12px;min-height:56px;border-radius:12px;border:1px solid var(--line);background:var(--concrete-2);margin-bottom:8px}
.xbtn b{display:block;font-weight:600}
.xbtn small{color:var(--pencil);font-size:13px}

/* modal + toast */
.modal{position:fixed;inset:0;z-index:20;background:rgba(15,17,19,.45);display:grid;place-items:center;padding:20px}
.mbox{background:var(--chalk);border-radius:16px;padding:20px;width:min(380px,100%);box-shadow:var(--shadow)}
.mbox h3{margin:0 0 12px;font-family:var(--cond);font-weight:600;font-size:22px}
.mbox p{margin:0 0 14px;color:var(--pencil)}
.mact{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
.mlist{display:flex;flex-direction:column;gap:6px}
.mlist .btn{justify-content:flex-start}
#toast{position:fixed;left:50%;top:calc(68px + var(--safe-t));transform:translateX(-50%);z-index:30;background:var(--graphite);color:var(--concrete);
  padding:10px 16px;border-radius:10px;font-size:15px;box-shadow:var(--shadow);max-width:calc(100% - 32px);text-align:center}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* floor plan: view switch, plan tools, overlay, walk stick */
#views{position:absolute;top:10px;left:10px;z-index:4;box-shadow:var(--shadow)}
#views button{min-width:48px;font-weight:600}
#planbar{position:absolute;left:10px;top:64px;z-index:4;display:flex;flex-direction:column;gap:2px;padding:4px;width:68px;
  background:var(--chalk);border-radius:12px;box-shadow:var(--shadow);max-height:calc(100% - 160px);overflow:auto}
#planbar button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;min-height:50px;border:0;border-radius:9px;
  background:transparent;font-size:12px;font-weight:500;padding:4px 2px}
#planbar button.on{background:var(--graphite);color:var(--concrete)}
#planbar select{width:100%;min-height:36px;border-radius:8px;border:1px solid var(--line);background:var(--concrete-2);font-size:11px;padding:0 1px}
#planSvg{position:absolute;inset:0;width:100%;height:100%;z-index:2;pointer-events:none;overflow:visible;font-family:var(--font)}
#planSvg .hit{pointer-events:auto;cursor:pointer;touch-action:none}
#planSvg text{text-anchor:middle;dominant-baseline:middle;paint-order:stroke;stroke:var(--chalk);stroke-width:3.5px;stroke-linejoin:round;fill:var(--graphite)}
#planSvg .wl{font-size:12px;font-weight:600}
#planSvg .rn{font-size:15px;font-weight:600}
#planSvg .ra,#planSvg .gl{font-size:12px;fill:var(--pencil)}
#planSvg .hv{fill:var(--tape);stroke:var(--tape-ink);stroke-width:1.5}
#planSvg .dl{fill:none;stroke:var(--tape);stroke-width:3;stroke-dasharray:7 5}
#planSvg .dp{fill:var(--tape)}
#planSvg .d0{fill:none;stroke:var(--tape);stroke-width:3}
#joy{position:absolute;left:18px;bottom:calc(150px + var(--safe-b));z-index:4;width:116px;height:116px;border-radius:50%;
  background:rgba(35,39,43,.28);border:2px solid rgba(255,255,255,.55);touch-action:none;display:grid;place-items:center}
#joyKnob{width:50px;height:50px;border-radius:50%;background:var(--chalk);box-shadow:var(--shadow);pointer-events:none}
@media (min-width:760px){#joy{bottom:calc(30px + var(--safe-b))}}
#wallsBtn{position:absolute;top:64px;left:10px;z-index:4;min-height:38px;box-shadow:var(--shadow)}
.room{padding:6px 0;border-bottom:1px solid var(--line)}
.room:last-of-type{border-bottom:0}
.rrow{display:grid;grid-template-columns:70px minmax(0,1fr) 34px;align-items:center;gap:8px;padding:3px 0 3px 8px;font-size:14px}
.rrow select{min-height:40px;border-radius:10px;border:1px solid var(--line);background:var(--concrete-2);padding:0 8px;width:100%}
#xrBtns{position:absolute;top:10px;right:10px;z-index:4;display:flex;gap:6px}
#xrBtns .btn{min-height:40px;box-shadow:var(--shadow);font-weight:600}
/* share-link viewer: walk-through only */
#viewBadge{display:none}
body.viewer #viewBadge{display:inline;font-size:13px;color:var(--pencil);padding:0 10px;white-space:nowrap}
body.viewer #topbar .ib,body.viewer #status,body.viewer #toolbar,body.viewer #ctx,body.viewer #panel,body.viewer #views,
body.viewer #planbar,body.viewer #xrBtns,body.viewer #wallsBtn,body.viewer #zoomReset,body.viewer #dim{display:none!important}
body.viewer #title{pointer-events:none}
body.viewer #joy{bottom:calc(30px + var(--safe-b))}
.viewerr{position:fixed;inset:0;display:grid;place-items:center;margin:0;padding:24px;text-align:center;font-size:18px;color:var(--pencil)}
#viewHelp{position:absolute;left:50%;top:16px;transform:translateX(-50%);z-index:6;width:min(360px,calc(100% - 32px));
  background:var(--chalk);color:var(--graphite);border-radius:14px;box-shadow:var(--shadow);padding:14px 16px}
#viewHelp b{font-family:var(--cond);font-size:20px;font-weight:600}
#viewHelp ul{margin:8px 0 12px;padding-left:20px;font-size:15px}
#viewHelp li{margin:4px 0}
#viewHelp .btn{width:100%}
#viewHelpBtn{position:absolute;top:12px;right:12px;z-index:6;background:var(--chalk);box-shadow:var(--shadow);font-weight:700;font-size:20px;border-radius:50%}
.mine{display:flex;align-items:center;gap:10px;margin-top:10px}
.mine>span{font-size:13px;color:var(--pencil);white-space:nowrap}