/* Bongshai Housing 3D viewer shell: full-screen canvas, spec panel (top-left; bottom sheet on phones),
   zoom / reset / save toolbar (bottom-right, as the Bongshai Steel configurator), hint pill. */
:root{
  --paper:#FBFAF6; --ink:#1C1F23; --muted:#5a6470; --gold:#C9962B; --gold-dk:#A87A12; --line:#e2ddd0;
  --panel:rgba(251,250,246,.95); --btn:#fff; --chip:#fff; --priceInk:#7a5a12; --sky:#e9dcc8;
  --display:"Archivo","Barlow Condensed",Arial,sans-serif; --body:"Hind Siliguri","Noto Sans Bengali",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--paper:#1c1f23;--ink:#eceef0;--muted:#a7b0ba;--line:#3a3f46;--panel:rgba(28,31,35,.94);--btn:#2a2e33;--chip:#2a2e33;--priceInk:#e2b85a}}
:root[data-theme="dark"]{--paper:#1c1f23;--ink:#eceef0;--muted:#a7b0ba;--line:#3a3f46;--panel:rgba(28,31,35,.94);--btn:#2a2e33;--chip:#2a2e33;--priceInk:#e2b85a}
html,body{height:100%}
body{margin:0;background:var(--sky);color:var(--ink);font-family:var(--body);overflow:hidden;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}
#scene{position:fixed;inset:0;display:block;width:100%;height:100%;touch-action:none;cursor:grab}
#scene:active{cursor:grabbing}
button,.full{font:600 13px var(--body);color:var(--ink);background:var(--btn);border:1px solid var(--line);border-radius:6px;padding:7px 11px;cursor:pointer;min-height:36px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}
button:hover,.full:hover{border-color:var(--gold)}
button:focus-visible,summary:focus-visible,.full:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
button[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}

.panel{position:fixed;z-index:3;top:calc(12px + env(safe-area-inset-top,0px));left:max(16px,env(safe-area-inset-left,0px));
  width:min(320px,calc(100vw - 32px));max-height:calc(100% - 96px);overflow:auto;background:var(--panel);
  border:1px solid var(--line);border-top:4px solid var(--gold);border-radius:8px;padding:14px;display:flex;flex-direction:column;gap:12px;
  box-shadow:0 6px 24px rgba(28,31,35,.14);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.brand{display:flex;flex-direction:column;gap:3px}
.brand small{font:700 10.5px var(--mono);letter-spacing:.12em;color:var(--gold)}
.brand h1{margin:0;font:800 20px var(--display);letter-spacing:.01em;text-wrap:balance}
.facts{display:flex;flex-wrap:wrap;gap:6px}
.facts span{font:600 12px var(--body);background:var(--chip);border:1px solid var(--line);border-radius:4px;padding:2px 8px;font-variant-numeric:tabular-nums}
.facts span.price{border-color:var(--gold);color:var(--priceInk)}
.group{display:flex;flex-direction:column;gap:6px}
.body{gap:12px}
.group > b{font:700 10.5px var(--mono);letter-spacing:.1em;color:var(--muted);text-transform:uppercase}
.row{display:flex;flex-wrap:wrap;gap:6px}
details{border-top:1px solid var(--line);padding-top:8px}
summary{cursor:pointer;font:700 12px var(--mono);letter-spacing:.06em}
dl{display:grid;grid-template-columns:auto 1fr;gap:5px 10px;margin:8px 0 0;font-size:12.5px;line-height:1.4}
dt{font:700 10.5px var(--mono);color:var(--muted);padding-top:2px}
dd{margin:0;min-width:0}
.note{font-size:11.5px;color:var(--muted);line-height:1.45;margin:0}
#toggle{display:none;align-self:flex-start}
.panel.closed .body{display:none}

.nav{position:fixed;z-index:3;right:max(12px,env(safe-area-inset-right,0px));bottom:calc(12px + env(safe-area-inset-bottom,0px));display:flex;flex-wrap:wrap;gap:4px;justify-content:flex-end;max-width:calc(100vw - 24px)}
.nav button,.nav .full{border:1px solid var(--gold-dk);border-radius:0;background:rgba(255,253,246,.95);color:#5C4108;font:800 12.5px var(--display);letter-spacing:.03em;min-width:40px;height:38px;padding:0 10px}
.nav button[data-nav="in"],.nav button[data-nav="out"]{font-size:18px}
.nav button:hover,.nav .full:hover{background:#FFF4D1}
.nav button:disabled{opacity:.55;cursor:progress}
.hint{position:fixed;z-index:2;bottom:calc(12px + env(safe-area-inset-bottom,0px));left:16px;
  background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:12.5px;color:var(--muted);
  white-space:nowrap;max-width:calc(100vw - 340px);overflow:hidden;text-overflow:ellipsis}
.tip{position:fixed;inset:0;z-index:2;display:grid;place-items:center;background:rgba(28,31,35,.35);color:#fff;font:700 15px var(--body);opacity:0;pointer-events:none;transition:opacity .2s}
.tip.on{opacity:1}
.loading{position:fixed;inset:0;z-index:4;display:flex;align-items:center;justify-content:center;gap:10px;background:var(--sky);color:#3a3f45;font:600 14px var(--body);transition:opacity .4s}
.loading.done{opacity:0;pointer-events:none}
.spin{width:18px;height:18px;border:3px solid rgba(201,150,43,.3);border-top-color:var(--gold);border-radius:50%;animation:sp 0.9s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion: reduce){.spin{animation:none}}

/* embedded in the model page: compact header, no hint pill, the page scrolls past the model */
.embed .panel{width:auto;max-width:calc(100vw - 32px);padding:10px 12px;gap:8px}
.embed .brand h1{font-size:17px}
.embed .hint{display:none}
.embed #toggle{display:inline-flex}
.full{display:none}
.embed .full{display:inline-flex}

/* phones: menu collapses to a button, opens as a bottom sheet over the model; bigger touch targets */
@media (max-width:640px){
  .panel{padding:10px 12px;gap:8px}
  #toggle{display:inline-flex}
  .brand h1{font-size:17px}
  .panel:not(.closed){top:auto;bottom:calc(60px + env(safe-area-inset-bottom,0px));max-height:58%;}
  .row button{min-height:42px;flex:1 1 auto}
  .hint{display:none}
  .nav button,.nav .full{height:42px;min-width:44px}
}
@media (pointer:coarse){.tip{display:none}}
@media (max-width:640px){.embed .facts,.embed .brand small{display:none}.embed .panel.closed{flex-direction:row;align-items:center;gap:10px;padding:6px 8px 6px 12px}}
/* embedded: the site's floating chat buttons sit bottom-right of the page, so the toolbar moves bottom-left */
.embed .nav{left:max(12px,env(safe-area-inset-left,0px));right:auto;justify-content:flex-start}
@media (max-width:640px){.embed .nav [data-nav="img"]{display:none}}