:root{
  --bg:#070b14;
  --panel:#0f1625;
  --panel-2:#131d31;
  --line:#24324d;
  --text:#f6f8ff;
  --muted:#94a3b8;
  --accent:#2f7cff;
  --accent-2:#7657ff;
  --danger:#c84b61;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif;min-height:100vh}
button,input,select{font:inherit}
button{cursor:pointer;border:1px solid var(--line);border-radius:10px;padding:10px 13px;background:#10192a;color:var(--text)}
button:hover{filter:brightness(1.08)}
.primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));border-color:transparent;font-weight:700}
.secondary{background:#17243c;border-color:#31456c}
.ghost{background:#0b1220}
.danger{background:#2a1117;border-color:#5a2732;color:#ffb4c2}
.small{padding:5px 9px;border-radius:8px}
.full{width:100%;margin-bottom:8px}
.topbar{height:76px;padding:14px 22px;border-bottom:1px solid var(--line);background:#0a101c;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}
.brand{font-size:24px;font-weight:800}.brand span{font-size:12px;color:#9bc0ff;border:1px solid #335b9d;padding:3px 7px;border-radius:999px;vertical-align:middle}.tagline{font-size:13px;color:var(--muted);margin-top:3px}.top-actions{display:flex;gap:8px}
.app-shell{display:grid;grid-template-columns:290px minmax(0,1fr) 300px;height:calc(100vh - 76px)}
.panel{overflow:auto;padding:18px;background:var(--panel);border-right:1px solid var(--line)}.right-panel{border-right:0;border-left:1px solid var(--line)}
section{margin-bottom:24px}h2{font-size:15px;margin:0 0 12px;color:#dce8ff;letter-spacing:.01em}
label{display:block;font-size:12px;color:#c6d2e5;margin-bottom:10px}input[type="text"],input[type="number"],select{width:100%;margin-top:5px;background:#09111f;color:white;border:1px solid var(--line);border-radius:8px;padding:8px}
input[type="range"]{width:100%;margin-top:7px}input[type="color"]{margin-left:10px;vertical-align:middle}
.check-row{display:flex;gap:8px;align-items:center}.check-row input{margin:0}.muted{color:var(--muted);line-height:1.45}.hidden{display:none!important}
.monitor-card{border:1px solid var(--line);background:#0b1322;border-radius:10px;padding:10px;margin-bottom:9px}.monitor-card strong{font-size:12px}.monitor-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:8px}
.inline-actions,.stack-actions{display:flex;gap:8px;flex-wrap:wrap}.stack-actions{flex-direction:column}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.upload-box{border:1px dashed #3a527e;border-radius:12px;padding:18px;text-align:center;background:#0b1425;color:#dbe7ff;cursor:pointer}.upload-box span{display:block;font-weight:700}.upload-box small{display:block;color:var(--muted);margin-top:5px}
.workspace{min-width:0;display:flex;flex-direction:column;background:radial-gradient(circle at center,#121d31 0,#080d17 70%)}
.workspace-toolbar{height:46px;padding:8px 14px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;color:#c7d6ee;font-size:12px}.zoom-controls{display:flex;align-items:center;gap:7px}
.canvas-viewport{flex:1;overflow:auto;padding:28px;display:flex;align-items:center;justify-content:center;min-height:0}
canvas{background:#0b1020;box-shadow:0 18px 60px rgba(0,0,0,.45);border:1px solid #1c2941;transform-origin:center center;max-width:none}
.hint{padding:8px 14px;color:var(--muted);font-size:11px;text-align:center;border-top:1px solid var(--line)}
.layer-list{display:flex;flex-direction:column;gap:7px}.layer-item{padding:9px 10px;background:#0b1322;border:1px solid var(--line);border-radius:8px;display:flex;align-items:center;justify-content:space-between;gap:8px;cursor:pointer}.layer-item.active{border-color:var(--accent);box-shadow:0 0 0 1px rgba(47,124,255,.25)}.layer-item small{color:var(--muted)}
@media (max-width:1100px){.app-shell{grid-template-columns:240px minmax(0,1fr)}.right-panel{display:none}}


/* V1.1 layer deletion controls */
.layer-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.reorder-mark{color:var(--muted);font-size:15px;user-select:none}
.layer-trash{width:30px;height:30px;padding:0;border-radius:8px;background:#241017;border-color:#623041;color:#ffafbe;font-weight:800;line-height:1}
.layer-trash:hover{background:#3a1520;border-color:#8b3e52}
.layer-delete-top{margin-top:10px}
.layer-delete-top:disabled{opacity:.42;cursor:not-allowed;filter:none}
.layer-shortcut-hint{display:block;margin-top:7px;font-size:10px}
#deleteLayerBtnTop{margin-bottom:10px}


/* V1.3 Smart Extend controls */
.mode-block{display:flex;flex-direction:column;gap:7px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#0a1220}
.mode-title{font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#9bc0ff;margin-bottom:2px}
#smartExtendBtn{font-weight:800;border-color:#4668aa}
#fitModeHelp{display:block;padding:8px 10px;border-radius:8px;background:#0a1220;border:1px solid #1d2b46}


/* V1.5 rename controls only; rendering geometry unchanged from V1.3 */
.rename-row{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:end;margin-bottom:10px}.rename-row label{margin-bottom:0}.rename-btn{height:34px;margin-bottom:0;padding:7px 12px}