:root{--bg:#0f1115;--panel:#171a21;--line:#262b36;--text:#e8eaf0;--muted:#8b93a7;--acc:#4f8cff}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font:14px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text)}
header{display:flex;align-items:center;gap:10px;padding:8px 14px;border-bottom:1px solid var(--line);min-height:52px}
header h1{font-size:16px;margin:0}
header .tag{color:var(--muted);font-size:12px}
header .sp{flex:1}
#roomSel{max-width:240px}
main{display:grid;grid-template-columns:1fr 350px;height:calc(100vh - 52px)}
#stage{position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#0a0b0e}
#wrap{position:relative}
#gl{position:absolute;inset:0;width:100%;height:100%;display:block}
#ov{position:absolute;display:block;touch-action:none;cursor:crosshair}
#progress{position:absolute;top:0;left:0;right:0;height:3px;overflow:hidden}
#pbar{height:100%;width:0;background:var(--acc);transition:width .2s}
#pbar.indet{width:30%;animation:indet 1.1s infinite linear}
@keyframes indet{0%{transform:translateX(-100%)}100%{transform:translateX(400%)}}
.btn{background:#232836;color:var(--text);border:1px solid var(--line);border-radius:8px;padding:7px 12px;font:inherit;cursor:pointer;white-space:nowrap;text-decoration:none}
.btn:hover{border-color:#3a4252}
.btn:disabled{opacity:.5;cursor:default}
.btn.primary{background:var(--acc);border-color:var(--acc);color:#fff}
.btn.ghost{background:transparent}
.btn.small{padding:5px 10px;font-size:13px}
.btn.wide{width:100%;margin-top:10px;display:block;text-align:center}
aside{background:var(--panel);border-left:1px solid var(--line);overflow-y:auto}
aside section{padding:12px 16px;border-bottom:1px solid var(--line)}
aside h3{margin:0 0 8px;font-size:11.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.dim{color:var(--muted);font-weight:400;text-transform:none;letter-spacing:0;font-size:12px}
label{display:block;font-size:13px;color:#c9cedb;margin:6px 0}
label input[type=range],label select,label input[type=number]{display:block;width:100%;margin-top:4px}
select,input[type=number]{background:#0f1218;color:var(--text);border:1px solid var(--line);border-radius:6px;padding:6px;font:inherit}
input[type=color]{display:block;width:100%;height:32px;margin-top:4px;border:1px solid var(--line);border-radius:6px;background:none;padding:0}
input[type=range]{accent-color:var(--acc)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px;margin-top:8px}
.chk{display:flex;gap:8px;align-items:center}
.note{color:var(--muted);font-size:12px;margin:4px 0 8px}
.tabs{display:flex;flex-wrap:wrap;gap:6px}
.tab{background:#0f1218;border:1px solid var(--line);color:var(--muted);border-radius:8px;padding:6px 10px;font:inherit;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.tab.on{background:#2a3142;color:#fff;border-color:#3a4252}
.tab .dot{width:7px;height:7px;border-radius:50%;background:#4ade80;display:inline-block}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tile{display:flex;flex-direction:column;gap:6px;text-align:left;background:#0f1218;border:2px solid transparent;border-radius:10px;padding:6px;color:var(--text);cursor:pointer;font:inherit}
.tile canvas{width:100%;aspect-ratio:1;border-radius:6px;display:block}
.tile b{display:block;font-size:12.5px}
.tile span{font-size:11px;color:var(--muted)}
.tile.on{border-color:var(--acc)}
.cat{background:#0f1218;border:1px solid var(--line);border-radius:10px;padding:10px;margin-bottom:12px}
.cat-h{display:flex;justify-content:space-between;align-items:center;font-size:13px}
.cat-h a{color:var(--acc);font-size:12px;text-decoration:none}
.cat .btn{display:inline-block;margin-top:4px}
.swatches{display:flex;gap:6px;margin-top:6px;flex-wrap:wrap}
.swatches button{width:24px;height:24px;border-radius:50%;border:2px solid var(--line);cursor:pointer;padding:0}
.swatches button.on{border-color:#fff;box-shadow:0 0 0 2px var(--acc)}
.calc div{display:flex;justify-content:space-between;gap:8px;padding:3px 0;font-size:13px}
.calc span{color:var(--muted)}
.calc .tot{border-top:1px solid var(--line);margin-top:4px;padding-top:6px;font-size:15px}
#toolbar{position:absolute;left:50%;bottom:12px;transform:translateX(-50%);display:flex;gap:12px;align-items:center;background:rgba(23,26,33,.94);border:1px solid var(--line);border-radius:12px;padding:8px 12px;max-width:calc(100% - 24px);flex-wrap:wrap;justify-content:center;z-index:3}
.seg{display:flex;background:#0f1218;border-radius:8px;padding:2px}
.seg button{background:none;border:0;color:var(--muted);padding:6px 10px;border-radius:6px;font:inherit;cursor:pointer;white-space:nowrap}
.seg button.on{background:#2a3142;color:#fff}
.mini{display:flex;align-items:center;gap:6px;margin:0;font-size:12px;color:var(--muted)}
.mini input{width:90px}
#hint{position:absolute;top:10px;left:50%;transform:translateX(-50%);background:rgba(23,26,33,.92);border:1px solid var(--line);padding:6px 12px;border-radius:8px;font-size:12.5px;color:#c9cedb;width:max-content;max-width:min(640px,92%);text-align:center;pointer-events:none;z-index:2}
details summary{cursor:pointer;color:#c9cedb;font-size:13px;margin-top:10px}
details input[type=file]{margin:8px 0;font-size:12px;width:100%}
#photoModal{position:fixed;inset:0;background:rgba(0,0,0,.72);display:none;align-items:center;justify-content:center;z-index:50;padding:12px}
.pm{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px;width:min(980px,96vw);max-height:94vh;overflow:auto}
.pm-h{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px;font-size:16px}
#photoResult img{width:100%;border-radius:10px;margin-top:10px;display:block}
#photoResult img.res{animation:fadein .7s ease-out}
#photoResult pre{white-space:pre-wrap;font-size:11.5px;color:var(--muted);background:#0f1218;border:1px solid var(--line);border-radius:8px;padding:10px}
@keyframes fadein{from{opacity:0;filter:blur(8px)}to{opacity:1;filter:none}}

/* waiting screen: the customer's own photo, blurred, with a scanner sweeping down and up */
.scan{position:relative;margin-top:10px;border-radius:10px;overflow:hidden;background:#0a0b0e}
.scan>img{display:block;width:100%;margin:0!important;border-radius:0!important;filter:blur(12px) saturate(.75) brightness(.7);transform:scale(1.06)}
.scan::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(140,180,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(140,180,255,.07) 1px,transparent 1px);background-size:32px 32px;pointer-events:none}
.scanline{position:absolute;left:0;right:0;top:0;height:2px;background:#cfe0ff;box-shadow:0 0 10px 3px rgba(130,175,255,.85),0 0 70px 26px rgba(79,140,255,.28);animation:scan 2.8s ease-in-out infinite alternate;z-index:1}
@keyframes scan{from{top:0}to{top:calc(100% - 2px)}}
.scanlbl{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);background:rgba(15,17,21,.78);border:1px solid rgba(255,255,255,.08);padding:7px 14px;border-radius:999px;font-size:13px;line-height:1.3;color:#fff;white-space:nowrap;z-index:2}

/* customer view */
#cust{position:fixed;inset:0;z-index:40;background:var(--bg);display:flex;flex-direction:column}
.c-top{display:flex;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid var(--line);min-height:52px}
.c-top b{font-size:16px}
.c-top .sp{flex:1}
.c-store{color:var(--muted);font-size:12px;border:1px solid var(--line);border-radius:999px;padding:2px 9px}
.c-main{flex:1;display:grid;grid-template-columns:1fr 380px;min-height:0}
.c-stage{position:relative;display:flex;align-items:center;justify-content:center;padding:16px;background:#0a0b0e;min-height:0;overflow:hidden}
.c-empty{color:var(--muted);font-size:15px;text-align:center;max-width:320px}
.c-frame{position:relative;border-radius:12px;overflow:hidden;line-height:0;max-width:100%}
.c-frame>#cBefore{display:block;max-width:100%;max-height:calc(100vh - 92px);width:auto;height:auto}
.c-after{position:absolute;inset:0;display:none}
.c-after img{display:block;width:100%;height:100%;object-fit:fill;animation:fadein .8s ease-out}
.c-line{position:absolute;top:0;bottom:0;left:50%;width:2px;margin-left:-1px;background:#fff;box-shadow:0 0 8px rgba(0,0,0,.6);display:none;pointer-events:none}
.c-line span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;color:#111;border-radius:999px;padding:6px 9px;font-size:11px;line-height:1;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.4)}
.c-ba{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize;display:none}
.c-lbl{position:absolute;top:12px;background:rgba(15,17,21,.72);color:#fff;font-size:12px;line-height:1;padding:7px 11px;border-radius:999px;display:none;pointer-events:none}
.c-l{left:12px}.c-r{right:12px}
.c-frame.done .c-after,.c-frame.done .c-line,.c-frame.done .c-ba,.c-frame.done .c-lbl{display:block}
.c-frame .scan{position:absolute;inset:0;margin:0;border-radius:0;z-index:5}
.c-frame .scan>img{height:100%;object-fit:cover}
.c-side{background:var(--panel);border-left:1px solid var(--line);overflow-y:auto;padding:4px 16px 16px}
.c-step{padding:12px 0;border-bottom:1px solid var(--line)}
.c-step:last-child{border-bottom:0}
.c-step h4{margin:0 0 8px;font-size:11.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.c-up{margin-top:0}
.c-rooms{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.c-rooms button{padding:0;border:2px solid transparent;border-radius:8px;overflow:hidden;cursor:pointer;background:#0f1218;aspect-ratio:4/3}
.c-rooms button img{width:100%;height:100%;object-fit:cover;display:block}
.c-rooms button.on{border-color:var(--acc)}
.c-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.c-tile{padding:0;border:2px solid transparent;border-radius:8px;background:#0f1218;cursor:pointer;color:var(--text);font:inherit;text-align:left;overflow:hidden}
.c-tile canvas,.c-tile .c-x{display:block;width:100%;aspect-ratio:1}
.c-tile .c-x{display:flex;align-items:center;justify-content:center;font-size:22px;color:var(--muted);background:repeating-linear-gradient(45deg,#141821 0 8px,#10131a 8px 16px)}
.c-tile span{display:block;font-size:10.5px;padding:4px 5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c-tile.on{border-color:var(--acc)}
.c-go{font-size:15px;padding:12px;margin-top:0}
.c-status{font-size:12.5px;color:var(--muted);min-height:18px;margin-top:8px}
.c-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
/* grout under each tile grid: label, width chips, colour swatches („A“ = the tile's recommended colour) */
.c-grout{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;margin-top:8px}
.c-glbl{font-size:12px;color:var(--muted);min-width:34px}
.c-grout .seg button{padding:5px 8px;font-size:12.5px}
.c-grout .swatches{margin-top:0;flex-basis:100%;padding-left:42px}
.c-gauto{font:700 11px/1 system-ui,sans-serif;display:flex;align-items:center;justify-content:center}
/* room width question */
.c-width{display:flex;align-items:center;gap:8px;margin-top:4px}
.c-width input{width:110px}
.c-width span{color:var(--muted);font-size:13px}
.c-width .btn.on{border-color:var(--acc);color:#fff}

@media(prefers-reduced-motion:reduce){.scanline{animation:none;top:50%}#photoResult img.res,.c-after img{animation:none}}
@media(max-width:860px){
  main{grid-template-columns:1fr;grid-template-rows:64vh auto;height:auto}
  aside{border-left:0}
  header{flex-wrap:wrap}
  header .tag{display:none}
  #toolbar{gap:8px;padding:6px}
  .mini input{width:70px}
  /* customer view on a phone: one scrolling page – the photo scrolls away, the render button stays at the bottom */
  #cust{display:block;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
  .c-top{min-height:0;padding:8px 12px;flex-wrap:wrap}
  .c-top b{font-size:14.5px}
  .c-main{display:block}
  .c-stage{display:flex;min-height:0;padding:10px;overflow:visible}
  .c-frame>#cBefore{max-height:58vh}
  .c-empty{padding:28px 8px}
  .c-side{overflow:visible;border-left:0;padding:0 14px}
  .c-tile span{font-size:10px}
  .c-width input{font-size:16px}
  .c-gostep{position:sticky;bottom:0;z-index:6;background:var(--panel);margin:0 -14px;padding:10px 14px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line);box-shadow:0 -8px 18px rgba(0,0,0,.35)}
  .c-gostep .c-status{min-height:0}
}