*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:#111318;color:#e9eaee;font:15px/1.35 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;overscroll-behavior:none}
#app{position:fixed;inset:0;display:flex;flex-direction:column;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}
header{flex:0 0 auto;background:#181b22;border-bottom:1px solid #2a2f3a;padding:6px 10px;display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:space-between;padding-top:max(6px,env(safe-area-inset-top))}
.brand{font-weight:700;white-space:nowrap} .brand small{color:#e8892b;font-weight:500;margin-left:4px}
.hdr-right{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px;align-items:center;margin-left:auto}
nav{display:flex;gap:6px} .tab{white-space:nowrap;background:#232834;color:#cfd3dc;border:1px solid #333a48;border-radius:18px;padding:5px 12px;font-size:14px}
.tab.active{background:#e8892b;color:#111;border-color:#e8892b;font-weight:700}
#lang{background:#232834;color:#e9eaee;border:1px solid #333a48;border-radius:8px;padding:5px;font-size:13px;max-width:120px}
.page{display:none;flex:1 1 auto;min-height:0;flex-direction:column} .page.active{display:flex}
/* viewer anchored in the top half; panel scrolls independently below */
.view-wrap{position:relative;flex:0 0 50dvh;height:50dvh;background:radial-gradient(#2a2f3a,#14171d);overflow:hidden;touch-action:none;border-bottom:1px solid #2a2f3a}
@supports not (height:1dvh){.view-wrap{flex-basis:50vh;height:50vh}}
canvas{width:100%;height:100%;display:block;touch-action:none;-webkit-user-select:none;user-select:none}
.panel{flex:1 1 auto;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:8px 10px calc(16px + env(safe-area-inset-bottom))}
@media (min-width:900px) and (min-aspect-ratio:1/1){
  .page.active{flex-direction:row}
  .view-wrap{flex:1 1 auto;height:auto;border-bottom:0;border-right:1px solid #2a2f3a}
  .panel{flex:0 0 440px}
}
.hint{position:absolute;left:8px;bottom:6px;font-size:11px;color:#8a90a0;pointer-events:none}
.busy{position:absolute;right:8px;top:8px;background:#e8892bcc;color:#111;font-size:12px;padding:2px 8px;border-radius:10px;display:none}
.stats{margin:4px 2px 6px;font-size:13px;color:#c9ccd6} .stats b{color:#fff}
.warn{font-size:13px;color:#ffcf7a} .warn div{margin:3px 0} .ok{color:#7be08a}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
button{font:inherit} .actions button{flex:1 1 180px;padding:11px;border-radius:10px;border:1px solid #3a4150;background:#232834;color:#e9eaee;font-weight:600}
.actions button.primary{background:#e8892b;color:#111;border-color:#e8892b} button:disabled{opacity:.5}
details{background:#181b22;border:1px solid #2a2f3a;border-radius:10px;margin:8px 0;padding:4px 10px}
summary{font-weight:700;padding:8px 0;cursor:pointer}
.row{display:grid;grid-template-columns:1fr 84px;gap:4px 8px;align-items:center;padding:6px 0;border-top:1px solid #222733}
.row label{grid-column:1/3;font-size:13px;color:#c9ccd6} .row label small{color:#8a90a0}
.row input[type=range]{width:100%;accent-color:#e8892b;height:28px}
.row input[type=number],.row select{width:100%;background:#0f1116;color:#fff;border:1px solid #3a4150;border-radius:6px;padding:6px;font-size:15px}
.row.check{grid-template-columns:1fr auto} .row.check label{grid-column:1} .row.check input{width:24px;height:24px;accent-color:#e8892b}
.row.sel{grid-template-columns:1fr} .row.sel label{grid-column:1}
.foot{font-size:12px;color:#8a90a0}
.loadbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.filebtn{background:#e8892b;color:#111;font-weight:700;padding:10px 14px;border-radius:10px} .filebtn input{display:none}
#vinfo{font-size:13px;color:#c9ccd6}
.units{display:flex;border:1px solid #333a48;border-radius:8px;overflow:hidden}
.units button{background:#232834;color:#cfd3dc;border:0;padding:5px 8px;font-size:13px;font-weight:600}
.units button.active{background:#e8892b;color:#111}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.note{margin:2px 2px 6px;color:#9aa3b5}
@media (max-width:430px){.brand small{display:none}.tab{padding:5px 9px;font-size:13px}#lang{max-width:92px}.units button{padding:5px 7px}.fsbtn{padding:3px 6px}}
.lyr{position:absolute;left:8px;top:8px;display:flex;align-items:center;gap:5px;font-size:12px;color:#cfd3dc;background:#181b22cc;padding:4px 8px;border-radius:12px;border:1px solid #333a48}
.lyr input{width:16px;height:16px;margin:0;accent-color:#e8892b}
.fsbtn{background:#232834;color:#cfd3dc;border:1px solid #333a48;border-radius:8px;padding:3px 8px;font-size:17px;line-height:1.2;cursor:pointer}
.fsbtn.active{background:#e8892b;color:#111;border-color:#e8892b}
.fsbtn[hidden]{display:none}
/* narrow phones: fullscreen button goes top-right next to the brand, selectors on the 2nd row */
@media (max-width:560px){.brand{order:0}.fsbtn{order:1;margin-left:auto}.hdr-right{order:2;flex:1 0 100%}}
@media (max-width:380px){#lang{max-width:80px;padding:5px 3px}.tab{padding:5px 8px}.hdr-right,nav{gap:4px}}