/* ============================================================================
   BasicCAD — Professional CAD UI
   ============================================================================ */
:root {
  --bg-primary: #1e1e22;
  --bg-secondary: #27272b;
  --bg-tertiary: #2f2f35;
  --bg-panel: #252529;
  --border: #3a3a42;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a8;
  --text-muted: #6a6a72;
  --accent: #0078d4;
  --accent-hover: #1a8ae8;
  --success: #22aa44;
  --warning: #dd8800;
  --error: #dd3333;
  --hover: rgba(255,255,255,0.06);
  --panel-width: 250px;
  --ribbon-height: 88px;
  --status-height: 24px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'Consolas','Monaco',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{width:100%;height:100%;overflow:hidden;font-family:var(--font);font-size:13px;color:var(--text-primary);background:var(--bg-primary);user-select:none}
#app{display:flex;flex-direction:column;width:100%;height:100%}

/* Ribbon */
#ribbon{height:var(--ribbon-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}
.ribbon-tabs{display:flex;height:26px;background:var(--bg-tertiary);border-bottom:1px solid var(--border);align-items:center;padding:0 8px;gap:0}
.ribbon-tabs .app-title{font-weight:700;color:var(--accent);margin-right:16px;font-size:13px;display:inline-flex;align-items:center;gap:0;font-family:Consolas,'Courier New',monospace;user-select:none}
.app-title .logo-cube-wrap{width:16px;height:16px;perspective:90px;display:inline-flex;align-items:center;justify-content:center;cursor:grab;margin-right:5px;flex-shrink:0}
.app-title .logo-cube-wrap:active{cursor:grabbing}
.app-title .logo-cube{width:16px;height:16px;position:relative;transform-style:preserve-3d;transform:rotateX(-25deg) rotateY(40deg)}
.app-title .logo-face{position:absolute;width:16px;height:16px;border:1.2px solid #fdcb6e;background:rgba(253,203,110,0.08);box-sizing:border-box}
.app-title .logo-face.f{transform:translateZ(8px)}
.app-title .logo-face.bk{transform:rotateY(180deg) translateZ(8px)}
.app-title .logo-face.l{transform:rotateY(-90deg) translateZ(8px)}
.app-title .logo-face.r{transform:rotateY(90deg) translateZ(8px)}
.app-title .logo-face.t{transform:rotateX(90deg) translateZ(8px)}
.app-title .logo-face.bt{transform:rotateX(-90deg) translateZ(8px)}
.app-title .logo-lt{color:#fdcb6e;font-weight:300;font-size:15px;opacity:0.9}
.app-title .logo-basic{color:#b2bec3;font-weight:400;font-size:13px;letter-spacing:2px}
.app-title .logo-cad{color:#fdcb6e;font-weight:400;font-size:13px;letter-spacing:2px}
.app-title .logo-sl{color:#fdcb6e;font-weight:300;font-size:15px;opacity:0.9}
.rtab{padding:3px 14px;cursor:pointer;color:var(--text-secondary);font-size:12px;border-bottom:2px solid transparent;transition:all .15s}
.rtab:hover{color:var(--text-primary);background:var(--hover)}
.rtab.active{color:var(--text-primary);border-bottom-color:var(--accent)}
.ribbon-content{flex:1;display:flex;align-items:center;padding:2px 6px;gap:1px;overflow-x:auto}
.rgroup{display:flex;align-items:center;gap:1px;padding:0 8px;border-right:1px solid var(--border);height:100%}
.rgroup:last-child{border-right:none}
.rbtn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;padding:3px 7px;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;border-radius:3px;min-width:44px;height:50px;font-size:10px;transition:all .12s;font-family:var(--font)}
.rbtn:hover{background:var(--hover);color:var(--text-primary)}
.rbtn:active{background:rgba(255,255,255,.1)}
.rbtn.active{background:var(--accent);color:#fff}
.rbtn .ico{font-size:18px;line-height:1}
.rbtn .lbl{font-size:10px;white-space:nowrap}
.rbtn-split{display:inline-flex;align-items:stretch;height:50px;border-radius:3px;position:relative}
.rbtn-split .rbtn-main{border-radius:3px 0 0 3px;min-width:36px;padding-right:2px;height:50px}
.rbtn-split .rbtn-arrow{display:flex;align-items:flex-end;justify-content:center;width:12px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;font-size:7px;padding:0 0 6px 0;border-radius:0 3px 3px 0;font-family:var(--font);height:50px;border-left:1px solid rgba(255,255,255,.08)}
.rbtn-split:hover .rbtn-main,.rbtn-split:hover .rbtn-arrow{background:var(--hover);color:var(--text-primary)}
.rbtn-split .rbtn-arrow:hover{background:rgba(255,255,255,.15)}

/* Main area */
#main{flex:1;display:flex;overflow:hidden;position:relative}

/* Panels */
.panel{width:var(--panel-width);background:var(--bg-panel);display:flex;flex-direction:column;flex-shrink:0;overflow:hidden}
.panel.left{border-right:1px solid var(--border)}
.panel.right{border-left:1px solid var(--border)}
.panel-hdr{padding:7px 12px;font-size:11px;font-weight:600;color:var(--text-secondary);background:var(--bg-tertiary);border-bottom:1px solid var(--border);text-transform:uppercase;letter-spacing:.5px}
.panel-body{flex:1;overflow-y:auto;padding:4px}
.panel-body::-webkit-scrollbar{width:6px}
.panel-body::-webkit-scrollbar-track{background:transparent}
.panel-body::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}

/* Tree items */
.tree-sec{padding:6px 8px 3px;font-size:10px;color:var(--text-muted);font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.tree-item{display:flex;align-items:center;padding:3px 8px;cursor:pointer;border-radius:3px;font-size:12px;gap:6px;transition:background .1s}
.tree-item:hover{background:var(--hover)}
.tree-item.sel{background:rgba(0,120,212,.2);color:var(--accent)}
.tree-ico{font-size:13px;width:16px;text-align:center;flex-shrink:0}
.tree-lbl{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tree-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.tree-dot.ok{background:var(--success)}
.tree-dot.warn{background:var(--warning)}
.tree-dot.err{background:var(--error)}
.tree-dot.sup{background:var(--text-muted)}
.tree-dot.pending{background:var(--warning)}
.tree-item.tree-hidden{opacity:.45;font-style:italic}
.tree-indent{width:14px;flex-shrink:0}

/* Property rows */
.prop-group{margin-bottom:6px}
.prop-hdr{padding:5px 8px;font-size:10px;color:var(--text-muted);font-weight:600;border-bottom:1px solid var(--border)}
.prop-row{display:flex;align-items:center;padding:3px 8px;gap:8px}
.prop-lbl{font-size:12px;color:var(--text-secondary);min-width:70px}
.prop-val{flex:1;font-family:var(--mono);font-size:12px}
.prop-inp{width:100%;padding:3px 6px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:3px;color:var(--text-primary);font-size:12px;font-family:var(--mono)}
.prop-inp:focus{outline:none;border-color:var(--accent)}

/* Viewport */
#viewport{flex:1;position:relative;overflow:hidden;background:#2a2a2e}
#viewport canvas{display:block}

/* Status bar */
#status{height:var(--status-height);background:var(--bg-secondary);border-top:1px solid var(--border);display:flex;align-items:center;padding:0 12px;font-size:11px;color:var(--text-muted);gap:20px;flex-shrink:0}
#status span{white-space:nowrap}
#status-msg{flex:1}

/* Context menu */
#ctx-menu{position:fixed;background:var(--bg-secondary);border:1px solid var(--border);border-radius:4px;padding:4px 0;min-width:170px;box-shadow:0 4px 12px rgba(0,0,0,.4);z-index:1000;display:none}
#ctx-menu.show{display:block}
.ctx-item{display:flex;align-items:center;padding:5px 12px;cursor:pointer;font-size:12px;color:var(--text-primary);gap:8px}
.ctx-item:hover{background:var(--accent);color:#fff}
.ctx-sep{height:1px;background:var(--border);margin:3px 0}
.ctx-key{margin-left:auto;color:var(--text-muted);font-size:11px}

/* Overlay */
#overlay{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:50}

/* Viewport Nav Buttons — ISO + XYZ overlay, top-right of viewport */
.vp-nav{position:absolute;top:10px;right:10px;display:flex;gap:6px;pointer-events:auto}
.vp-nav-btn{position:relative;min-width:52px;height:40px;padding:0 12px;background:rgba(39,39,43,0.92);color:var(--text-primary);border:1px solid var(--border);border-radius:4px;font:600 13px var(--font);cursor:pointer;display:flex;align-items:center;justify-content:center;letter-spacing:1px;transition:border-color .12s,color .12s,background .12s;backdrop-filter:blur(4px)}
.vp-nav-btn:hover{border-color:var(--accent);color:var(--accent);background:rgba(39,39,43,1)}
.vp-nav-btn:active{background:rgba(0,120,212,0.18)}
.vp-nav-lbl{line-height:1}
.vp-nav-axes{display:flex;gap:3px}
.vp-nav-axis{opacity:.42;transition:opacity .15s,color .15s;font-weight:600}
.vp-nav-axis.active{opacity:1;color:var(--accent)}
.vp-nav-badge{position:absolute;top:-7px;right:-7px;min-width:17px;height:17px;padding:0 4px;background:var(--accent);color:#fff;border-radius:9px;font:700 10px var(--font);display:flex;align-items:center;justify-content:center;box-shadow:0 1px 3px rgba(0,0,0,.45);letter-spacing:0;pointer-events:none}

/* Dimension input popup */
.dim-input-popup{position:absolute;pointer-events:auto;z-index:60;display:flex;align-items:center;background:var(--bg-secondary);border:1px solid var(--accent);border-radius:4px;padding:4px 6px;box-shadow:0 2px 8px rgba(0,0,0,0.5)}
.dim-input{width:80px;padding:3px 6px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:3px;color:var(--text-primary);font-size:13px;font-family:monospace;text-align:center;outline:none}
.dim-input:focus{border-color:var(--accent);box-shadow:0 0 4px var(--accent)}

/* Loading */
#loading{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg-primary);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:9999;gap:16px;padding-top:190px}
#loading.hidden{display:none}
.spinner{width:40px;height:40px;border:3px solid var(--border);border-top:3px solid var(--accent);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.load-text{color:var(--text-secondary);font-size:14px;font-weight:600;letter-spacing:1px}
.load-sub{color:var(--text-muted);font-size:12px}

/* Loading progress bar */
.load-bar-wrap{width:75vw;max-width:900px;margin-top:20px;display:flex;flex-direction:column;align-items:center;gap:10px}
.load-bar-track{width:100%;height:24px;background:rgba(255,255,255,0.06);border-radius:12px;overflow:hidden;position:relative;border:1px solid rgba(255,255,255,0.08)}
.load-bar-fill{height:100%;width:0%;border-radius:12px;background:linear-gradient(90deg,#ff0040,#ff8000,#ffe000,#40ff00,#00c8ff,#8040ff,#ff0080,#ff0040);background-size:400% 100%;animation:rainbow-flow 2s linear infinite;transition:width 0.15s linear;box-shadow:0 0 16px rgba(0,180,255,0.35),0 0 4px rgba(255,100,200,0.25) inset;position:relative}
.load-bar-fill::after{content:'';position:absolute;top:2px;left:8px;right:8px;height:6px;border-radius:4px;background:linear-gradient(90deg,rgba(255,255,255,0.35),rgba(255,255,255,0.08),rgba(255,255,255,0.35));background-size:300% 100%;animation:bar-glint 2.5s ease-in-out infinite}
@keyframes rainbow-flow{0%{background-position:0% 0}100%{background-position:400% 0}}
@keyframes bar-glint{0%{background-position:300% 0}100%{background-position:-300% 0}}
.load-bar-msg{font-size:18px;color:var(--text-secondary);min-height:24px;text-align:center;transition:opacity 0.3s;letter-spacing:0.3px;margin-top:4px}

/* Spinning 3D cube loader */
.cube-wrap{width:102px;height:102px;perspective:340px;position:relative;top:-40px}
.cube{width:100%;height:100%;position:relative;transform-style:preserve-3d;animation:cube-spin 3s ease-in-out infinite}
.cube-face{position:absolute;width:102px;height:102px;border:2px solid #fdcb6e;background:rgba(253,203,110,0.08);box-sizing:border-box}
.cube-face.front {transform:translateZ(51px)}
.cube-face.back  {transform:rotateY(180deg) translateZ(51px)}
.cube-face.left  {transform:rotateY(-90deg) translateZ(51px)}
.cube-face.right {transform:rotateY(90deg) translateZ(51px)}
.cube-face.top   {transform:rotateX(90deg) translateZ(51px)}
.cube-face.bottom{transform:rotateX(-90deg) translateZ(51px)}
@keyframes cube-spin{
  0%  {transform:rotateX(0deg) rotateY(0deg)}
  15% {transform:rotateX(10deg) rotateY(20deg)}
  50% {transform:rotateX(180deg) rotateY(360deg)}
  85% {transform:rotateX(350deg) rotateY(700deg)}
  100%{transform:rotateX(360deg) rotateY(720deg)}
}

/* Splash page */
#splash{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg-primary);display:flex;align-items:center;justify-content:center;z-index:9998;overflow-y:auto}
#splash.hidden{display:none}
#app.hidden{display:none}
.splash-inner{text-align:center;max-width:700px;width:90%;padding:40px 0}
.splash-title{font-size:32px;font-weight:700;color:#fff;letter-spacing:2px;margin-bottom:4px}
.splash-subtitle{font-size:13px;color:var(--text-muted);margin-bottom:36px}
.splash-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.splash-card{position:relative;background:var(--bg-secondary);border:1px solid var(--border);border-radius:10px;padding:28px 20px 22px;cursor:pointer;transition:all .2s;text-align:center}
.splash-card:hover:not(.disabled){border-color:var(--accent);background:#1e2a3a;transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,120,212,0.2)}
.splash-card.disabled{opacity:0.45;cursor:default}
.splash-icon{font-size:36px;margin-bottom:10px}
.splash-label{font-size:15px;font-weight:600;color:#fff;margin-bottom:6px}
.splash-desc{font-size:11px;color:var(--text-muted);line-height:1.5}
.splash-badge{position:absolute;top:10px;right:10px;background:#555;color:#ccc;font-size:9px;padding:2px 8px;border-radius:10px;font-weight:600;text-transform:uppercase;letter-spacing:0.5px}
.splash-about{margin-top:28px;text-align:center}
.splash-about-toggle{color:var(--text-muted);font-size:13px;cursor:pointer;display:inline-block;padding:6px 16px;border:1px solid var(--border);border-radius:4px;transition:color .15s,border-color .15s}
.splash-about-toggle:hover{color:var(--text-primary);border-color:var(--text-secondary)}
.splash-about-content{text-align:left;max-width:600px;margin:16px auto 0;padding:20px 24px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:6px}
.splash-about-content h3{font-size:14px;font-weight:600;color:var(--text-primary);margin:14px 0 6px}
.splash-about-content h3:first-child{margin-top:0}
.splash-about-content p{font-size:12px;color:var(--text-secondary);line-height:1.6;margin-bottom:8px}
.splash-about-sig{color:var(--text-muted);font-style:italic;margin-top:12px}

/* Modal */
.modal-bg{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:2000}
.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:6px;padding:20px;min-width:320px;box-shadow:0 8px 24px rgba(0,0,0,.5)}
.modal h3{font-size:14px;font-weight:600;margin-bottom:12px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
.btn{padding:6px 16px;border:1px solid var(--border);border-radius:3px;background:var(--bg-tertiary);color:var(--text-primary);cursor:pointer;font-size:12px;font-family:var(--font)}
.btn:hover{background:var(--hover)}
.btn-p{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-p:hover{background:var(--accent-hover)}

/* Auth / Subscription modals */
.auth-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:3000}
.auth-modal-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;padding:24px;min-width:360px;max-width:440px;box-shadow:0 12px 40px rgba(0,0,0,.6)}
.auth-modal-header{font-size:16px;font-weight:700;color:var(--text-primary);margin-bottom:16px}
.auth-modal-body{margin-bottom:16px}
.auth-modal-footer{display:flex;justify-content:flex-end;border-top:1px solid var(--border);padding-top:12px}
.auth-btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 20px;border-radius:4px;border:none;cursor:pointer;font-size:13px;font-family:var(--font);transition:background .15s,opacity .15s}
.auth-btn-primary{background:var(--accent);color:#fff;width:100%}
.auth-btn-primary:hover{background:var(--accent-hover)}
.auth-btn-trial{background:transparent;color:var(--text-secondary);border:1px solid var(--border);padding:6px 16px;font-size:12px}
.auth-btn-trial:hover{background:var(--hover);color:var(--text-primary)}
.auth-btn-danger{background:#d32f2f;color:#fff;width:100%}
.auth-btn-danger:hover{background:#b71c1c}
.auth-btn-link{background:none;color:var(--text-muted);padding:4px 8px;font-size:12px}
.auth-btn-link:hover{color:var(--text-primary)}
.auth-plans{display:flex;gap:12px;margin-top:12px}
.auth-plan-card{flex:1;border:1px solid var(--border);border-radius:6px;padding:16px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s}
.auth-plan-card:hover{border-color:var(--accent);background:rgba(0,120,212,.08)}
.auth-plan-best{border-color:var(--accent);position:relative}
.auth-plan-badge{position:absolute;top:-10px;right:12px;background:var(--accent);color:#fff;font-size:10px;padding:2px 8px;border-radius:10px;font-weight:600}
.auth-plan-price{font-size:28px;font-weight:700;color:var(--text-primary)}
.auth-plan-period{font-size:13px;font-weight:400;color:var(--text-muted)}
.auth-plan-desc{font-size:11px;color:var(--text-secondary);margin-top:4px}

/* Load Recent button (in ribbon tab bar) */
.load-recent-btn{background:rgba(100,181,246,.15);color:#64b5f6;border:1px solid rgba(100,181,246,.3);border-radius:3px;padding:2px 12px;cursor:pointer;font-size:11px;font-family:var(--font);font-weight:600;margin-left:10px;transition:all .15s;flex-shrink:0;white-space:nowrap}
.load-recent-btn:hover{background:rgba(100,181,246,.25);border-color:rgba(100,181,246,.5);color:#90caf9}

/* Auth ribbon button */
.auth-ribbon-btn{background:#a5d6a7;color:#1b5e20;border:none;border-radius:3px;padding:2px 10px;cursor:pointer;font-size:11px;font-family:var(--font);font-weight:600;margin-right:8px;transition:opacity .15s}
.auth-ribbon-btn:hover{opacity:.85}
.pwa-install-btn{background:rgba(0,120,212,.2);color:#64b5f6;border:1px solid rgba(100,181,246,.3);border-radius:3px;padding:2px 12px;cursor:pointer;font-size:11px;font-family:var(--font);font-weight:600;transition:all .15s;flex-shrink:0;white-space:nowrap}
.pwa-install-btn:hover{background:rgba(0,120,212,.35);border-color:rgba(100,181,246,.5);color:#90caf9}
.ribbon-version{font-size:10px;color:#666;font-family:var(--mono);cursor:pointer;flex-shrink:0;padding:0 4px}

/* Wish input (ribbon bar) */
.wish-input{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:3px;color:var(--text-primary);font-size:11px;font-family:var(--font);padding:3px 10px;width:180px;max-width:180px;outline:none;transition:border-color .15s,background .15s;flex-shrink:0}
.wish-input:focus{border-color:var(--accent);background:rgba(255,255,255,.18);color:#fff}
.wish-input::placeholder{color:rgba(255,255,255,.45);font-style:italic}

/* About / Report modals — reuse auth-modal pattern */
.about-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:3000}
.about-modal-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;padding:24px 28px;min-width:380px;max-width:480px;box-shadow:0 12px 40px rgba(0,0,0,.6);max-height:70vh;overflow-y:auto}
.about-modal-box h2{font-size:18px;font-weight:700;color:var(--accent);margin-bottom:12px}
.about-modal-box h3{font-size:14px;font-weight:600;color:var(--text-primary);margin:16px 0 6px}
.about-modal-box p{font-size:12px;color:var(--text-secondary);line-height:1.55;margin-bottom:6px}
.about-modal-box .about-sig{color:var(--text-muted);font-style:italic;margin-top:12px}
.about-close-btn{background:var(--accent);color:#fff;border:none;border-radius:4px;padding:6px 20px;cursor:pointer;font-size:13px;font-family:var(--font);margin-top:16px;transition:background .15s}
.about-close-btn:hover{background:var(--accent-hover)}

/* Report issue modal */
.report-modal-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;padding:28px 32px;min-width:420px;max-width:540px;box-shadow:0 12px 40px rgba(0,0,0,.6)}
.report-modal-box h2{font-size:16px;font-weight:700;color:var(--text-primary);margin-bottom:16px}
.report-modal-box label{display:block;font-size:12px;color:var(--text-secondary);margin-bottom:4px;margin-top:12px}
.report-modal-box textarea{width:100%;background:var(--bg-primary);border:1px solid var(--border);border-radius:4px;color:var(--text-primary);font-family:var(--font);font-size:13px;padding:8px;resize:vertical;min-height:80px;outline:none}
.report-modal-box textarea:focus{border-color:var(--accent)}
.report-modal-box .report-check{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:12px;color:var(--text-secondary);cursor:pointer}
.report-modal-box .report-check input{accent-color:var(--accent)}
.report-modal-footer{display:flex;justify-content:flex-end;gap:8px;margin-top:16px;border-top:1px solid var(--border);padding-top:12px}
.report-btn-cancel{background:transparent;color:var(--text-secondary);border:1px solid var(--border);border-radius:4px;padding:6px 16px;cursor:pointer;font-size:13px;font-family:var(--font)}
.report-btn-cancel:hover{background:var(--hover);color:var(--text-primary)}
.report-btn-send{background:var(--accent);color:#fff;border:none;border-radius:4px;padding:6px 20px;cursor:pointer;font-size:13px;font-family:var(--font);transition:background .15s}
.report-btn-send:hover{background:var(--accent-hover)}
.report-btn-send:disabled{opacity:.5;cursor:not-allowed}

/* Admin panel modal */
.admin-modal-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;padding:24px 28px;min-width:560px;max-width:720px;box-shadow:0 12px 40px rgba(0,0,0,.6);max-height:80vh;display:flex;flex-direction:column}
.admin-modal-box h2{font-size:16px;font-weight:700;color:var(--text-primary);margin-bottom:12px}
.admin-tabs{display:flex;gap:4px;margin-bottom:12px;border-bottom:1px solid var(--border);padding-bottom:8px}
.admin-tab{background:transparent;border:none;color:var(--text-secondary);font-size:13px;font-family:var(--font);padding:6px 14px;cursor:pointer;border-radius:4px 4px 0 0;transition:background .15s,color .15s}
.admin-tab:hover{background:var(--hover);color:var(--text-primary)}
.admin-tab.active{background:var(--accent);color:#fff}
.admin-panel-content{flex:1;overflow-y:auto;min-height:120px;max-height:50vh}
.admin-table{width:100%;border-collapse:collapse;font-size:12px}
.admin-table th{text-align:left;color:var(--text-muted);font-weight:600;padding:6px 8px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--bg-secondary)}
.admin-table td{padding:6px 8px;color:var(--text-secondary);border-bottom:1px solid rgba(255,255,255,.04);vertical-align:top}
.admin-table tr:hover td{background:var(--hover)}

/* ============================================================================
   2D Engineering Drawing Mode
   ============================================================================ */

/* Drawing toolbar (under ribbon) */
#drawing-toolbar{height:24px;background:var(--bg-tertiary);border-bottom:1px solid var(--border);display:none;align-items:center;padding:0 12px;gap:12px;flex-shrink:0}
#drawing-toolbar.active{display:flex}
.draw-toolbar-btn{background:none;border:1px solid var(--border);border-radius:3px;color:var(--text-secondary);font-size:11px;padding:2px 10px;cursor:pointer;font-family:var(--font);transition:background .15s,color .15s}
.draw-toolbar-btn:hover{background:var(--hover);color:var(--text-primary)}
.draw-toolbar-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.draw-toolbar-sep{width:1px;height:14px;background:var(--border)}

/* Drawing canvas container */
#drawing-container{flex:1;position:relative;overflow:hidden;background:#3a3a42}
.drawing-canvas{display:block;width:100%;height:100%;touch-action:none}

/* View groups */
.drawing-view{cursor:grab}
.drawing-view:active{cursor:grabbing}
.view-bounds{pointer-events:all}

/* Drawing tree */
.draw-tree{font-size:12px}
.draw-tree-node{padding:4px 8px;cursor:pointer;display:flex;align-items:center;gap:6px;border-radius:3px;transition:background .15s}
.draw-tree-node:hover{background:var(--hover)}
.draw-tree-node.selected{background:rgba(0,120,212,.2);color:var(--accent)}
.draw-tree-node.active-sheet{font-weight:600}
.tree-icon{font-size:13px;flex-shrink:0}
.tree-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary)}
.draw-tree-node.selected .tree-label{color:var(--accent)}
.tree-empty{padding:16px;color:var(--text-muted);text-align:center;font-size:12px}

/* Drawing context menu */
.draw-ctx-menu{background:var(--bg-secondary);border:1px solid var(--border);border-radius:2px;padding:1px 0;min-width:70px;box-shadow:0 2px 6px rgba(0,0,0,.4);z-index:3000;font-size:7px}
.draw-ctx-fo{overflow:visible}
.draw-ctx-item{padding:2px 8px;font-size:7px;color:var(--text-secondary);cursor:pointer;transition:background .15s;white-space:nowrap}
.draw-ctx-item:hover{background:var(--hover);color:var(--text-primary)}