/* ============================================================
   GARGANTUA — HUD & UI styles
   ============================================================ */
:root{
  --accent:#ffb347;
  --accent2:#7ec8ff;
  --bg-panel:rgba(8,10,16,0.82);
  --border:rgba(255,179,71,0.25);
  --text:#e8e6e1;
  --text-dim:#8a877f;
  --mono:'SF Mono','JetBrains Mono','Fira Code',Menlo,Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box;}
html,body{width:100%;height:100%;overflow:hidden;background:#000;}
body{font-family:var(--mono);color:var(--text);font-size:12px;}

#gl{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none;}

/* ---------------- HUD ---------------- */
#hud{position:fixed;inset:0;pointer-events:none;z-index:10;transition:opacity .4s;}
#hud.hidden{opacity:0;}

#hud-top{
  position:absolute;top:0;left:0;right:0;
  display:flex;justify-content:space-between;align-items:flex-start;
  padding:18px 22px;
  background:linear-gradient(to bottom, rgba(0,0,0,0.55), transparent);
}
#title h1{
  font-size:22px;letter-spacing:8px;font-weight:600;
  color:var(--accent);
  text-shadow:0 0 18px rgba(255,179,71,0.5);
}
#title .sub{font-size:9px;letter-spacing:4px;color:var(--text-dim);}
#stats{display:flex;gap:14px;font-size:11px;color:var(--text-dim);text-align:right;}
#stats span{min-width:60px;}
#stat-quality{color:var(--accent2);}

#hud-bottom{
  position:absolute;bottom:0;left:0;right:0;
  padding:14px 22px;
  background:linear-gradient(to top, rgba(0,0,0,0.55), transparent);
}
#cam-info{display:flex;gap:18px;font-size:11px;color:var(--text-dim);}
#cam-mode{color:var(--accent);}

/* ---------------- Control panel ---------------- */
#panel{
  position:absolute;top:70px;right:16px;width:280px;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:8px;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  pointer-events:auto;
  transform:translateX(320px);
  transition:transform .35s cubic-bezier(.2,.9,.3,1);
  max-height:calc(100vh - 140px);
  overflow-y:auto;
  scrollbar-width:thin;
}
#panel.open{transform:translateX(0);}

#panel-tabs{display:flex;border-bottom:1px solid var(--border);}
#panel-tabs .tab{
  flex:1;padding:9px 0;background:transparent;border:none;color:var(--text-dim);
  font-family:var(--mono);font-size:10px;letter-spacing:2px;cursor:pointer;
  border-bottom:2px solid transparent;transition:all .2s;
}
#panel-tabs .tab:hover{color:var(--text);}
#panel-tabs .tab.active{color:var(--accent);border-bottom-color:var(--accent);}

.tab-page{display:none;padding:12px 14px;}
.tab-page.active{display:block;}

.row{
  display:flex;align-items:center;gap:8px;margin-bottom:9px;
}
.row label{
  width:78px;flex-shrink:0;font-size:10px;letter-spacing:1px;
  color:var(--text-dim);text-transform:uppercase;
}
.row input[type=range]{
  flex:1;-webkit-appearance:none;appearance:none;height:3px;
  background:rgba(255,255,255,0.15);border-radius:2px;outline:none;
  pointer-events:auto;
}
.row input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:12px;height:12px;border-radius:50%;
  background:var(--accent);cursor:pointer;box-shadow:0 0 8px rgba(255,179,71,0.6);
}
.row input[type=range]::-moz-range-thumb{
  width:12px;height:12px;border-radius:50%;background:var(--accent);
  cursor:pointer;border:none;
}
.row .val{width:38px;text-align:right;font-size:10px;color:var(--accent2);}
.row input[type=checkbox]{
  width:16px;height:16px;accent-color:var(--accent);cursor:pointer;
}
.row select{
  flex:1;background:rgba(255,255,255,0.08);color:var(--text);
  border:1px solid var(--border);border-radius:4px;padding:5px;
  font-family:var(--mono);font-size:11px;outline:none;
}
.btn-group{display:flex;gap:4px;flex:1;flex-wrap:wrap;}
.btn-group button{
  flex:1;min-width:52px;padding:6px 2px;background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.12);border-radius:4px;color:var(--text-dim);
  font-family:var(--mono);font-size:9px;letter-spacing:1px;cursor:pointer;
  transition:all .15s;
}
.btn-group button:hover{color:var(--text);border-color:var(--accent);}
.btn-group button.active{
  color:#000;background:var(--accent);border-color:var(--accent);
  box-shadow:0 0 10px rgba(255,179,71,0.4);
}
.row.keys{margin-top:10px;}
.key-help{font-size:9px;line-height:1.7;color:var(--text-dim);}
.key-help b{color:var(--accent2);}

#panel-toggle{
  position:absolute;top:70px;right:16px;width:34px;height:34px;
  background:var(--bg-panel);border:1px solid var(--border);border-radius:6px;
  color:var(--accent);font-size:16px;cursor:pointer;pointer-events:auto;
  display:flex;align-items:center;justify-content:center;
  transition:all .2s;z-index:11;
}
#panel-toggle:hover{background:rgba(255,179,71,0.15);}
#panel.open ~ #panel-toggle{right:306px;}

/* ---------------- Overlay ---------------- */
#overlay{
  position:fixed;inset:0;background:#000;z-index:100;
  display:flex;align-items:center;justify-content:center;
  transition:opacity .8s;
}
#overlay.fade{opacity:0;pointer-events:none;}
#overlay-inner{text-align:center;}
.loader-ring{
  width:64px;height:64px;margin:0 auto 20px;
  border:2px solid rgba(255,179,71,0.15);
  border-top-color:var(--accent);
  border-radius:50%;
  animation:spin 1s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
#overlay-text{font-size:11px;letter-spacing:4px;color:var(--text-dim);}
#overlay-text.error{color:#ff5555;letter-spacing:1px;font-size:13px;max-width:480px;line-height:1.6;}

/* ---------------- Mobile ---------------- */
@media (max-width:768px){
  #panel{width:calc(100vw - 32px);right:16px;top:auto;bottom:60px;max-height:52vh;}
  #panel.open ~ #panel-toggle{right:16px;top:auto;bottom:calc(52vh + 70px);}
  #panel-toggle{top:auto;bottom:60px;}
  #title h1{font-size:16px;letter-spacing:5px;}
  #stats{font-size:9px;gap:8px;}
  #hud-top{padding:12px 14px;}
  .row label{width:64px;}
}