:root{
  --panel:#ffffff; --panel-2:#f1f5f9; --text:#0f1f2e; --muted:#5a6b7b; --line:#d4dde6;
  --accent:#0a7cff; --danger:#d93644;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --panel:#121b25; --panel-2:#1a2531; --text:#e7eef5; --muted:#91a2b3; --line:#2a3644;
    --accent:#3d9bff; --danger:#ff6470;
  }
}
:root[data-theme="dark"]{
  --panel:#121b25; --panel-2:#1a2531; --text:#e7eef5; --muted:#91a2b3; --line:#2a3644;
  --accent:#3d9bff; --danger:#ff6470;
}
html{height:100%;scroll-padding-top:env(safe-area-inset-top,0px)}
*,*::before,*::after{box-sizing:inherit}
body{height:100%;margin:0;background:#082238;color:var(--text);
  font:15px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  overflow:hidden;overscroll-behavior:none;-webkit-tap-highlight-color:transparent}
#scene{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}

/* overlays sit on the water, so they keep a fixed dark-glass look */
.topbar{position:fixed;top:0;left:0;right:0;z-index:5;display:flex;gap:8px;overflow-x:auto;
  padding:calc(env(safe-area-inset-top,0px) + 10px) 12px 6px;scrollbar-width:none;pointer-events:none}
.topbar::-webkit-scrollbar{display:none}
.chip{pointer-events:auto;flex:none;border:1px solid rgba(255,255,255,.2);background:rgba(6,20,34,.75);
  color:#e8f4ff;padding:9px 15px;border-radius:999px;font:600 14px/1 inherit;font-family:inherit;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);cursor:pointer}
.chip.active{background:#3d9bff;border-color:#3d9bff;color:#fff}
.chip.home{display:inline-flex;align-items:center;gap:4px;text-decoration:none;padding-left:10px}
.chip.home svg{width:15px;height:15px}
.chip.tk-btn{max-width:46vw}
.hud{position:fixed;left:12px;right:12px;top:calc(env(safe-area-inset-top,0px) + 58px);z-index:4;
  pointer-events:none;display:flex;flex-direction:column;align-items:flex-start;gap:6px}
.stats{background:rgba(6,20,34,.72);color:#dcecfb;border-radius:10px;padding:7px 10px;font-size:12.5px;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.stats b{color:#fff}
.legend{background:rgba(6,20,34,.72);border-radius:10px;padding:7px 10px 6px;width:200px;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.legend .bar{height:7px;border-radius:4px;
  background:linear-gradient(90deg,#ff4d6b 0%,#ff9e38 18%,#33ccff 45%,#dff8ff 100%)}
.legend .lbls{display:flex;justify-content:space-between;color:#b9cfe3;font-size:11px;margin-top:4px}
.bottombar{position:fixed;left:0;right:0;bottom:0;z-index:5;display:flex;gap:10px;justify-content:center;
  padding:0 12px calc(env(safe-area-inset-bottom,0px) + 14px)}
.btn{flex:1;max-width:170px;padding:14px 10px;border-radius:14px;border:1px solid rgba(255,255,255,.2);
  background:rgba(6,20,34,.82);color:#fff;font:650 15px/1 inherit;font-family:inherit;cursor:pointer;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.btn.primary{background:#3d9bff;border-color:#3d9bff}
.btn.primary.placing{background:#e5484d;border-color:#e5484d}
.banner,.toast{position:fixed;left:50%;transform:translateX(-50%);z-index:6;
  bottom:calc(env(safe-area-inset-bottom,0px) + 78px);max-width:calc(100% - 24px);
  background:rgba(6,20,34,.9);color:#fff;border-radius:12px;padding:10px 14px;font-size:14px;text-align:center}
.banner{border:1.5px solid #e5484d}
.banner[hidden]{display:none}
.toast{opacity:0;transition:opacity .25s;pointer-events:none;z-index:40}
.act{display:block;width:100%;padding:11px 8px;border-radius:10px;border:1px solid var(--line);background:var(--panel-2);
  color:var(--text);font:600 15px/1.2 inherit;font-family:inherit;cursor:pointer}
.act.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.act.danger{color:var(--danger);border-color:var(--danger);background:none;margin-top:14px}
.editor{position:fixed;inset:0;z-index:30;background:#04111d;color:#eaf4ff;display:flex;flex-direction:column;
  padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px)}
.editor[hidden]{display:none}
.ed-top{padding:12px 16px 6px}
.ed-top strong{font-size:17px}
.ed-top p{margin:4px 0 0;font-size:14px;color:#a9c3da}
#edCanvas{flex:1;min-height:0;width:100%;touch-action:none;display:block}
.ed-bar{display:flex;gap:8px;padding:10px 12px 14px}
.ed-bar button{flex:1;padding:13px 6px;border-radius:12px;border:1px solid rgba(255,255,255,.2);background:#10263a;
  color:#fff;font:650 15px/1 inherit;font-family:inherit;cursor:pointer}
.ed-bar button.primary{background:#3d9bff;border-color:#3d9bff}
.toast.show{opacity:1}

/* settings sheet uses the theme tokens */
.sheet{position:fixed;left:0;right:0;bottom:0;margin:0 auto;max-width:560px;max-height:72%;z-index:20;
  display:flex;flex-direction:column;background:var(--panel);color:var(--text);
  border-radius:18px 18px 0 0;box-shadow:0 -8px 30px rgba(0,0,0,.35);
  transform:translateY(105%);transition:transform .28s ease;padding-bottom:env(safe-area-inset-bottom,0px)}
.sheet.open{transform:none}
.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 10px;
  border-bottom:1px solid var(--line);position:relative}
.sheet-head::before{content:"";position:absolute;top:5px;left:50%;width:36px;height:4px;margin-left:-18px;
  border-radius:2px;background:var(--line)}
.sheet-head strong{font-size:17px}
.done{background:none;border:0;color:var(--accent);font:650 16px/1 inherit;font-family:inherit;cursor:pointer;padding:6px}
.sheet-body{overflow-y:auto;padding:6px 16px 22px;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
.sheet-body h3{font-size:15px;margin:18px 0 8px}
.muted{color:var(--muted);font-size:13px;margin:6px 0 0}
.row3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.fld{display:block}
.fld span,.cap{display:block;font-size:12.5px;color:var(--muted);margin-bottom:4px}
input[type=number],input[type=text],textarea,select{width:100%;font-size:16px;padding:10px;border-radius:10px;
  border:1px solid var(--line);background:var(--panel-2);color:var(--text);font-family:inherit}
.pcard{border:1px solid var(--line);border-radius:14px;padding:12px;margin:10px 0;background:var(--panel-2)}
.pcard.sel{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.phead{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.dot{width:12px;height:12px;border-radius:50%;flex:none}
.del{margin-left:auto;background:none;border:1px solid var(--danger);color:var(--danger);border-radius:8px;
  padding:5px 10px;font:600 13px/1 inherit;font-family:inherit;cursor:pointer}
.two{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;background:var(--panel);padding:3px;
  border-radius:10px;margin-top:10px;border:1px solid var(--line)}
.seg button{border:0;border-radius:8px;padding:9px 4px;background:transparent;color:var(--text);
  font:600 14px/1 inherit;font-family:inherit;cursor:pointer}
.seg button.on{background:var(--accent);color:#fff}
.sl{display:grid;grid-template-columns:1fr auto;gap:2px 8px;margin-top:12px}
.sl span{font-size:13px;color:var(--muted)}
.sl output{font-size:13px;font-weight:650}
.sl input{grid-column:1/-1;width:100%;accent-color:var(--accent);margin:4px 0 0}
.tog{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:14px}
.tog input{width:22px;height:22px;accent-color:var(--accent)}
button:focus-visible,.chip:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid #7cc4ff;outline-offset:2px}
textarea{font:13px/1.4 ui-monospace,Menlo,Consolas,monospace;word-break:break-all;resize:vertical;margin:10px 0}
.saverow{display:flex;gap:8px}
.saverow input{flex:1;min-width:0}
.sitem{display:flex;align-items:center;gap:6px;padding:10px 0;border-bottom:1px solid var(--line)}
.sitem .meta{flex:1;min-width:0}
.sitem strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:15px}
.sitem .muted{margin:0;font-size:12px}
.mini{padding:9px 10px;border-radius:8px;border:1px solid var(--line);background:var(--panel-2);color:var(--text);
  font:600 13px/1 inherit;font-family:inherit;cursor:pointer;flex:none}
.mini.warn{color:var(--danger);border-color:var(--danger)}
.modal{position:fixed;inset:0;z-index:35;background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center;padding:16px}
.modal[hidden]{display:none}
.mbox{background:var(--panel);color:var(--text);border-radius:16px;padding:16px;width:100%;max-width:480px}
.mbox strong{font-size:17px}
.shapes{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.shape{display:flex;flex-direction:column;align-items:center;gap:6px;padding:10px 4px 9px;border-radius:12px;
  border:1px solid var(--line);background:var(--panel-2);color:var(--text);font:600 13px/1.2 inherit;font-family:inherit;cursor:pointer}
.shape.on{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.shape svg{width:58px;height:40px;display:block}
.preview{margin-top:12px;border:1px solid var(--line);border-radius:12px;background:var(--panel-2);padding:8px}
.preview svg{width:100%;height:auto;display:block}
#edExtra{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
#edExtra:empty{display:none}
#edExtra button{padding:8px 11px;border-radius:999px;border:1px solid rgba(255,255,255,.25);background:#10263a;color:#fff;
  font:600 13px/1 inherit;font-family:inherit;cursor:pointer}
@media (prefers-reduced-motion: reduce){.sheet,.toast{transition:none}}

/* wide screens: Setup opens as a side panel and the tank view shrinks to make room */
@media (min-width: 900px){
  :root{--side:400px}
  .sheet{top:0;left:auto;right:0;width:var(--side);max-width:none;max-height:none;margin:0;border-radius:0;
    transform:translateX(105%);box-shadow:-8px 0 30px rgba(0,0,0,.35);
    padding-top:env(safe-area-inset-top,0px)}
  .sheet-head::before{display:none}
  body.side-open #scene{width:calc(100% - var(--side))}
  body.side-open .topbar,body.side-open .bottombar{right:var(--side)}
  body.side-open .hud{right:calc(var(--side) + 12px)}
  body.side-open .banner,body.side-open .toast{left:calc((100% - var(--side))/2)}
}