:root{
    --bg:#eef1f7; --panel:#ffffff; --line:#dbe1ea; --text:#141b2d; --muted:#66708a;
    --accent:#2f5fe0; --accent-dark:#1d3fae; --accent2:#e3ecff; --warn:#b45309; --danger:#c0281a; --ok:#067647;
    --ribbon:#f7f9fd; --shadow:0 10px 28px rgba(15,23,42,.10); --shadow-sm:0 2px 6px rgba(15,23,42,.06);
    --radius:10px;
  }
  *{box-sizing:border-box}
  html,body{height:100%;margin:0;font-family:'Segoe UI',Inter,Arial,sans-serif;color:var(--text);background:var(--bg)}
  button,input,select,textarea{font:inherit}
  button{cursor:pointer;transition:background .12s ease,border-color .12s ease,box-shadow .12s ease,transform .06s ease}
  button:active{transform:translateY(1px)}
  .app{height:100vh;display:grid;grid-template-rows:auto auto 1fr auto;overflow:hidden}
  .titlebar{height:46px;background:linear-gradient(180deg,#16213f,#101a33);color:#fff;border-bottom:1px solid #0b1226;display:flex;align-items:center;justify-content:space-between;padding:0 16px;box-shadow:0 2px 10px rgba(0,0,0,.15)}
  .titlebar .brand{font-weight:700;letter-spacing:.01em;display:flex;align-items:center;gap:8px}
  .titlebar .brand span{font-weight:400;color:#aeb9d6;font-size:12px}
  .titlebar .file{font-size:12px;color:#c7cfe6;background:rgba(255,255,255,.08);padding:4px 10px;border-radius:999px}
  .ribbon{background:var(--ribbon);border-bottom:1px solid var(--line)}
  .tabs{display:flex;gap:2px;padding:6px 10px 0}.tab{border:0;background:transparent;padding:9px 14px;border-radius:8px 8px 0 0;color:#57617a;font-size:13px}.tab:hover{color:var(--accent)}.tab.active{background:#fff;color:var(--accent);font-weight:700;box-shadow:0 -1px 0 0 var(--line) inset}
  .tools{display:none;align-items:center;gap:8px;padding:9px;border-top:1px solid #e5e7eb;overflow-x:auto;background:#fff}
  .tools.tools-active{display:flex}
  .tool-sep{width:1px;align-self:stretch;background:var(--line);margin:2px 4px}
  .tool{min-width:70px;border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 10px;display:flex;flex-direction:column;align-items:center;gap:4px;box-shadow:var(--shadow-sm);color:var(--text)}
  .tool:hover{border-color:var(--accent);background:#f5f8ff;box-shadow:0 3px 10px rgba(47,95,224,.15)}
  .tool span:first-child{font-size:20px}.tool small{font-size:10.5px;color:#4b5568;font-weight:600}
  .tool.tool-active{border-color:var(--accent);background:var(--accent2);box-shadow:0 0 0 2px rgba(47,95,224,.28) inset}
  .main{min-height:0;display:grid;grid-template-columns:250px 1fr 310px;gap:10px;padding:10px}
  .panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);min-height:0;overflow:hidden;display:flex;flex-direction:column}
  .panel h3{font-size:12.5px;margin:0;padding:11px 13px;border-bottom:1px solid var(--line);background:#fbfcff;text-transform:uppercase;letter-spacing:.05em;color:#3a4257;font-weight:700}
  .library{display:flex;flex-direction:column}.search{padding:10px}.search input{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:8px;outline:none}.search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,95,224,.15)}
  .items{overflow:auto;padding:8px}.group{margin-bottom:12px}.group-title{font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:4px 4px 7px;font-weight:700}
  .item{display:flex;align-items:center;gap:9px;border:1px solid #e6e9f0;border-radius:9px;padding:8px;margin-bottom:6px;background:#fff;user-select:none;cursor:grab}.item:hover{border-color:var(--accent);background:#f5f8ff;box-shadow:var(--shadow-sm)}.item .ico{font-size:20px;width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--accent2);border-radius:7px}.item b{font-size:12px}.item small{display:block;color:var(--muted);font-size:10px}
  .canvas-wrap{position:relative;background:#eaf4ff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
  .canvas-footer-brand{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);z-index:11;pointer-events:none;font-size:11px;font-weight:600;letter-spacing:.15px;color:var(--muted);background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:6px;padding:4px 10px;white-space:nowrap;box-shadow:var(--shadow-sm)}
  @media print{.canvas-footer-brand{display:none!important}}
  .canvas-wrap.canvas-expanded{position:fixed!important;inset:8px!important;z-index:10000!important;border-radius:12px!important;background:#eaf4ff!important;box-shadow:0 24px 80px rgba(15,23,42,.35)!important}
  .canvas-wrap:fullscreen{background:#eaf4ff;border:0;border-radius:0}
  .canvas-wrap:-webkit-full-screen{background:#eaf4ff;border:0;border-radius:0}
  #canvas{width:100%;height:100%;display:block;background:#f4f7fb;touch-action:none}
  .view-switch{display:flex;gap:3px;margin-left:6px;background:#eef1f7;padding:2px;border-radius:8px}.view-switch button{border:0!important;box-shadow:none!important;border-radius:6px!important}.view-switch button.active{background:#fff;color:var(--accent);font-weight:700;box-shadow:var(--shadow-sm)!important}
  .view3d-controls{position:absolute;left:12px;top:56px;z-index:6;display:none;gap:6px;flex-wrap:wrap;max-width:600px}.view3d-controls.show{display:flex}.view3d-controls button,.view3d-controls select{border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 10px;box-shadow:var(--shadow-sm);font-size:12px}.view3d-controls button:hover{border-color:var(--accent);color:var(--accent)}
  .view3d-hint{position:absolute;left:12px;bottom:44px;z-index:6;background:rgba(16,26,51,.85);color:#e7ecf7;border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:6px 10px;font-size:11px;display:none}.view3d-hint.show{display:block}
  .canvas-toolbar{position:absolute;top:12px;left:12px;display:flex;gap:6px;z-index:5;align-items:center}.canvas-toolbar button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 10px;box-shadow:var(--shadow-sm)}.canvas-toolbar button:hover{border-color:var(--accent);color:var(--accent)}
  #measureBtn.active{background:var(--accent2);color:var(--accent);border-color:var(--accent)}
  .scale-bar{position:absolute;right:14px;bottom:205px;z-index:6;display:flex;flex-direction:column;align-items:flex-end;gap:2px;pointer-events:none;background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:7px;padding:6px 10px 8px;box-shadow:var(--shadow-sm)}
  .scale-bar svg{display:block}
  .scale-bar .scale-label{font-size:10.5px;color:#334;font-weight:600}
  .calc-result{font-weight:700;font-size:16px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#f8fafc;color:#1a2140}
  .calc-result.warn{color:var(--danger);background:#fee4e2;border-color:#fca5a5;font-size:12.5px;font-weight:600}
  .legend{position:absolute;right:12px;bottom:44px;top:auto;background:rgba(16,26,51,.85);color:#e7ecf7;border:1px solid rgba(255,255,255,.1);border-radius:9px;padding:9px 12px;font-size:11.5px;box-shadow:var(--shadow);backdrop-filter:blur(2px)}
  .legend b{color:#fff;font-size:11.5px;letter-spacing:.03em}
  .legend div{display:flex;align-items:center;gap:7px;margin:4px 0}.sw{width:12px;height:12px;border-radius:3px;box-shadow:0 0 0 1px rgba(255,255,255,.25) inset}
  .statusbar{position:absolute;bottom:10px;left:12px;right:12px;background:rgba(16,26,51,.85);color:#cfd7ea;border:1px solid rgba(255,255,255,.08);border-radius:8px;padding:6px 10px;font-size:11.5px;display:flex;justify-content:space-between}
  .properties{display:flex;flex-direction:column}.prop-content{overflow:auto;padding:11px;flex:1;min-height:0}.section{border:1px solid #e6e9f0;border-radius:9px;margin-bottom:10px;overflow:hidden}.section h4{margin:0;padding:9px 11px;background:#f8fafc;font-size:12px;font-weight:700;color:#334}.fields{padding:10px;display:grid;grid-template-columns:1fr 1fr;gap:9px}.field{display:flex;flex-direction:column;gap:3px}.field.full{grid-column:1/-1}.field label{font-size:10px;color:var(--muted);text-transform:capitalize}.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:7px;padding:7px 8px;background:#fff}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,95,224,.15)}.field textarea{min-height:64px;resize:vertical}
  .struct-tree-section{flex-shrink:0;border-bottom:1px solid var(--line)}.struct-tree{max-height:210px;overflow:auto;padding:7px;display:flex;flex-direction:column;gap:6px}
  .struct-item{border:1px solid #e6e9f0;border-radius:8px;padding:7px 8px;cursor:pointer;background:#fff}.struct-item:hover{border-color:var(--accent);background:#f5f8ff}.struct-item.active{border-color:var(--accent);background:var(--accent2);box-shadow:0 0 0 1px var(--accent) inset}
  .struct-item .struct-head{display:flex;justify-content:space-between;align-items:baseline;gap:6px;margin-bottom:5px}.struct-item .struct-head b{font-size:12px}.struct-item .struct-head span{font-size:10px;color:var(--muted)}
  .struct-item .struct-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}.struct-item .struct-fields label{display:flex;flex-direction:column;gap:2px;font-size:9.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
  .struct-item .struct-fields input{width:100%;border:1px solid var(--line);border-radius:6px;padding:4px 5px;font-size:11.5px;background:#fff}.struct-item .struct-fields input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px rgba(47,95,224,.15)}
  .struct-tree-empty{font-size:11.5px;color:var(--muted);padding:4px 2px}
.struct-item [data-equipment-lock]{background:#08131b;color:#7CFC7C;border-color:#2f5e3a}.struct-item [data-equipment-lock]:hover{background:#10251a;border-color:#52d66b;color:#a6ffa6}
  .bottom{height:230px;margin:0 10px 10px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);display:grid;grid-template-rows:auto 1fr;overflow:hidden}
  .bottom.collapsed{height:42px}.bottom.collapsed .bottom-body{display:none}.bottom-tabs{display:flex;align-items:center;gap:4px;padding:6px 10px;border-bottom:1px solid var(--line);background:#fbfcfe}.bottom-tabs button{border:0;background:transparent;padding:8px 12px;border-radius:7px;font-size:12.5px;color:#4b5568}.bottom-tabs button.active{background:var(--accent2);color:var(--accent);font-weight:700}.bottom-tabs .spacer{flex:1}
  .bottom-body{overflow:auto;padding:12px}.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:9px}.kpi{border:1px solid #e6e9f0;border-radius:9px;padding:11px;background:linear-gradient(180deg,#fff,#fbfcff)}.kpi small{color:var(--muted);text-transform:uppercase;font-size:10px;letter-spacing:.04em}.kpi b{display:block;font-size:20px;margin-top:5px;color:#1a2140}
  table{border-collapse:collapse;width:100%;font-size:12px}th,td{border-bottom:1px solid #eef0f4;padding:8px 7px;text-align:left}th{background:#f8fafc;position:sticky;top:0;color:#3a4257;font-weight:700}tbody tr:hover{background:#f8fbff}
  .badge{display:inline-block;padding:3px 8px;border-radius:999px;font-size:10px;font-weight:700}.ok{background:#dcfae6;color:var(--ok)}.warn{background:#fef0c7;color:var(--warn)}.danger{background:#fee4e2;color:var(--danger)}.info{background:#e0f2fe;color:#075985}
  .modal{position:fixed;inset:0;background:rgba(10,16,32,.55);display:none;align-items:center;justify-content:center;z-index:50;backdrop-filter:blur(2px)}.modal.show{display:flex}.dialog{width:min(900px,92vw);max-height:88vh;background:#fff;border-radius:14px;box-shadow:0 30px 70px rgba(0,0,0,.28);display:flex;flex-direction:column}.dialog h2{font-size:18px;margin:0;padding:16px 18px;border-bottom:1px solid var(--line)}.dialog .body{padding:16px;overflow:auto}.dialog .actions{padding:13px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}.primary{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:9px 15px;font-weight:600}.primary:hover{background:var(--accent-dark)}.secondary{background:#fff;border:1px solid var(--line);border-radius:8px;padding:9px 15px}.secondary:hover{border-color:var(--accent);color:var(--accent)}
  .template-grid{display:grid;grid-template-columns:repeat(2,minmax(240px,1fr));gap:12px}.template-card{border:1px solid var(--line);border-radius:11px;padding:15px;background:#fff;text-align:left}.template-card:hover{border-color:var(--accent);background:#f5f8ff;box-shadow:var(--shadow-sm)}.template-card b{display:block;margin-bottom:5px}.template-card small{color:var(--muted);line-height:1.45}
  .report{font-family:Arial,sans-serif;color:#111}.report h1{font-size:26px}.report h2{border-bottom:2px solid #222;padding-bottom:5px}.report .cover{padding:28px;border:1px solid #ccc;margin-bottom:24px}.report-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.report-box{border:1px solid #ccc;padding:10px}
  @media (max-width:1100px){.main{grid-template-columns:220px 1fr}.properties{position:absolute;right:16px;top:155px;width:300px;height:calc(100vh - 410px);z-index:8}.kpis{grid-template-columns:repeat(3,1fr)}}
  @media print{body{background:#fff}.app{display:none}.modal{position:static;display:block;background:#fff}.dialog{box-shadow:none;width:100%;max-height:none}.dialog h2,.dialog .actions{display:none}.dialog .body{overflow:visible}.report{display:block}}

  .sphere-animation-panel{display:none;align-items:center;gap:7px;flex-wrap:wrap;background:#fbfcff;border:1px solid var(--line);border-radius:9px;box-shadow:var(--shadow-sm);padding:7px 9px;margin-left:2px}
  .sphere-animation-panel.show{display:flex}.sphere-animation-panel button,.sphere-animation-panel select,.sphere-animation-panel input{border:1px solid var(--line);background:#fff;border-radius:7px;padding:6px 8px;font-size:11.5px}.sphere-animation-panel button.active{background:var(--accent2);color:var(--accent);border-color:var(--accent)}
  .sphere-animation-panel label{display:flex;align-items:center;gap:4px;font-size:11px;color:var(--muted);white-space:nowrap}
  .sphere-animation-panel .progress{flex:0 0 90px;min-width:70px;height:8px;background:#e5e7eb;border-radius:999px;overflow:hidden}.sphere-animation-panel .progress>span{display:block;height:100%;background:var(--accent);width:0%}
  .sphere-animation-panel .anim-status{font-size:11px;color:var(--muted);min-width:160px;white-space:nowrap}.sphere-animation-panel button:disabled{opacity:.45;cursor:not-allowed}.sphere-animation-panel input[type="number"]{text-align:center}.nav-mode.active{background:var(--accent2)!important;color:var(--accent)!important;border-color:var(--accent)!important}
  .sphere-group-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding-right:2px;border-right:1px solid var(--line);margin-right:2px}

  /* Coverage-only edition */
  [data-tool="conductor"],[data-tool="ringpoly"],[data-tool="strike"],
  [data-quickadd="down"],[data-quickadd="rod"],[data-quickadd="ring"],[data-quickadd="bond"],[data-quickadd="spd"],
  [data-action="showStrike"],[data-action="showMaterials"]{display:none!important}