:root{--bg:#f8fafc;--panel:#fff;--border:#e2e8f0;--text:#0f172a;--text-dim:#64748b;--accent:#f59e0b;--accent-strong:#d97706;--canvas-bg:#eef2f7;--grid-dot:#c7d2e0;--roof-fill:#e7e5e4eb;--roof-fill-draft:#f59e0b14;--roof-stroke:#78716c;--danger:#dc2626;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;overflow:hidden}body{background:var(--bg);font-size:14px}.app{flex-direction:column;height:100%;display:flex}.topbar{background:var(--panel);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:10px;height:52px;padding:0 14px;display:flex}.brand{letter-spacing:-.01em;align-items:center;gap:8px;font-size:15px;font-weight:700;display:flex}.brand-icon{color:#fff;background:linear-gradient(135deg,#fbbf24,#f59e0b);border-radius:9px;place-items:center;width:32px;height:32px;display:grid;box-shadow:0 1px 3px #d9770666}.project-name{color:var(--text);background:0 0;border:1px solid #0000;border-radius:7px;width:220px;padding:6px 10px;font-size:14px;font-weight:500;transition:border-color .15s,background .15s}.project-name:hover{background:var(--bg)}.project-name:focus{border-color:var(--accent);background:#fff;outline:none}.topbar-group{align-items:center;gap:6px;display:flex}.topbar-spacer{flex:1}.zoom-label{color:var(--text-dim);font-variant-numeric:tabular-nums;font-size:12px}.save-warning{color:#b45309;text-overflow:ellipsis;white-space:nowrap;background:#fef3c7;border:1px solid #fcd34d;border-radius:7px;max-width:380px;padding:5px 10px;font-size:12px;overflow:hidden}.scale-status{border-radius:8px;margin-bottom:12px;padding:9px 11px;font-size:12.5px;line-height:1.5}.scale-status.ok{color:#15803d;background:#f0fdf4;border:1px solid #bbf7d0}.scale-status.warn{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca}button{cursor:pointer;font-family:inherit}.icon-btn{width:34px;height:34px;color:var(--text);background:0 0;border:none;border-radius:8px;place-items:center;transition:background .15s;display:grid}.icon-btn:hover:not(:disabled){background:var(--bg)}.icon-btn:disabled{opacity:.3;cursor:default}.icon-btn.danger:hover{color:var(--danger);background:#fef2f2}.btn{border:1px solid var(--border);background:var(--panel);height:34px;color:var(--text);border-radius:8px;align-items:center;gap:7px;padding:0 13px;font-size:13px;font-weight:500;transition:background .15s,border-color .15s;display:inline-flex}.btn:hover{background:var(--bg);border-color:#cbd5e1}.btn.subtle{border-color:var(--border);color:var(--text-dim)}.btn.danger-subtle{color:var(--danger)}.btn.danger-subtle:hover{background:#fef2f2;border-color:#fecaca}button.primary{color:#fff;background:linear-gradient(135deg,#fbbf24,#f59e0b);border:none;border-radius:9px;height:38px;padding:0 18px;font-size:14px;font-weight:600;transition:filter .15s;box-shadow:0 1px 3px #d9770666}button.primary:hover{filter:brightness(1.05)}.main{flex:1;min-height:0;display:flex}.stage{flex:1;min-width:0;position:relative}.canvas{touch-action:none;width:100%;height:100%;display:block}.toolbar{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;align-items:center;gap:4px;width:52px;padding:10px 0;display:flex}.tool-btn{width:38px;height:38px;color:var(--text);background:0 0;border:none;border-radius:9px;place-items:center;transition:background .15s;display:grid}.tool-btn:hover{background:var(--bg)}.tool-btn.active{color:var(--accent-strong);box-shadow:inset 0 0 0 1.5px var(--accent);background:#fef3c7}.toolbar-sep{background:var(--border);width:26px;height:1px;margin:6px 0}.sidepanel{background:var(--panel);border-left:1px solid var(--border);flex-shrink:0;width:280px;padding-bottom:24px;overflow-y:auto}.sidepanel section{border-bottom:1px solid var(--border);padding:16px 16px 14px}.sidepanel h3{text-transform:uppercase;letter-spacing:.07em;color:var(--text-dim);margin-bottom:12px;font-size:11px;font-weight:700}.stats{grid-template-columns:1fr 1fr;gap:8px;margin-bottom:12px;display:grid}.stat{background:var(--bg);border-radius:10px;flex-direction:column;gap:2px;padding:10px 12px;display:flex}.stat-value{letter-spacing:-.02em;font-variant-numeric:tabular-nums;font-size:18px;font-weight:700}.stat-label{color:var(--text-dim);font-size:11px}.cable-stats{flex-direction:column;gap:6px;display:flex}.cable-stat{align-items:center;gap:8px;font-size:13px;display:flex}.cable-len{font-variant-numeric:tabular-nums;color:var(--text-dim);margin-left:auto}.cable-dot{border-radius:50%;flex-shrink:0;width:10px;height:10px;display:inline-block}.field{flex-direction:column;flex:1;gap:5px;min-width:0;margin-bottom:10px;display:flex}.field>span{color:var(--text-dim);font-size:12px}.field input[type=number],.field input[type=text],.field select{border:1px solid var(--border);height:32px;color:var(--text);background:#fff;border-radius:7px;width:100%;padding:0 8px;font-family:inherit;font-size:13px}.field input:focus,.field select:focus{border-color:var(--accent);outline:none}.field-row{gap:8px;display:flex}.seg{border:1px solid var(--border);border-radius:7px;height:32px;display:flex;overflow:hidden}.seg button{color:var(--text-dim);background:#fff;border:none;flex:1;font-size:12px}.seg button.active{color:var(--accent-strong);background:#fef3c7;font-weight:600}.btn-row{gap:8px;margin-top:10px;display:flex}.selection-section{background:#fffbeb}.selection-section p{font-size:13px;line-height:1.5}.help ul{flex-direction:column;gap:6px;list-style:none;display:flex}.help li{color:var(--text-dim);padding-left:14px;font-size:12px;line-height:1.45;position:relative}.help 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var(--border);-webkit-user-select:all;user-select:all;border-radius:9px;max-height:130px;margin-bottom:16px;padding:12px;font-family:ui-monospace,monospace;font-size:11px;line-height:1.5;overflow-y:auto}.upgrade-btn{color:#b45309;background:#fffbeb;border-color:#fcd34d;font-weight:600}.upgrade-btn:hover{background:#fef3c7;border-color:#fbbf24}.lang-toggle{border:1px solid var(--border);border-radius:8px;height:30px;display:flex;overflow:hidden}.lang-toggle button{color:var(--text-dim);background:#fff;border:none;padding:0 10px;font-size:12px;font-weight:600}.lang-toggle button.active{color:var(--accent-strong);background:#fef3c7}.free-limit-pill{text-align:left;color:#b45309;background:#fffbeb;border:1px dashed #fcd34d;border-radius:9px;width:100%;margin-bottom:12px;padding:7px 11px;font-size:12px;font-weight:600;transition:background .15s;display:block}.free-limit-pill:hover{background:#fef3c7}.upgrade-modal{width:380px}.upgrade-header 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button:hover{opacity:1}.modal-backdrop{z-index:100;background:#0f172a73;place-items:center;display:grid;position:fixed;inset:0}.modal{background:#fff;border-radius:14px;width:340px;padding:22px;box-shadow:0 12px 40px #0f172a4d}.modal h3{margin-bottom:6px;font-size:16px}.modal p{color:var(--text-dim);margin-bottom:14px;font-size:13px;line-height:1.5}.modal-row{align-items:center;gap:10px;margin-bottom:18px;display:flex}.modal-row input{border:1px solid var(--border);border-radius:8px;flex:1;height:38px;padding:0 12px;font-family:inherit;font-size:15px}.modal-row input:focus{border-color:var(--accent);outline:none}.modal-actions{justify-content:flex-end;gap:8px;display:flex}.modal-actions button:not(.primary){border:1px solid var(--border);background:#fff;border-radius:9px;height:38px;padding:0 14px;font-size:14px}.account-btn{text-overflow:ellipsis;white-space:nowrap;max-width:160px;overflow:hidden}.account-modal{width:360px}.account-modal h3{margin-bottom:8px}.account-modal>div>p,.account-modal p{margin-bottom:12px}.account-info{background:var(--bg);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:8px;margin-bottom:16px;padding:12px;display:flex}.account-row{justify-content:space-between;font-size:13.5px;display:flex}.account-row span{color:var(--text-dim)}.auth-error{color:var(--danger);margin-bottom:10px;font-size:12.5px}.auth-links{flex-direction:column;align-items:center;gap:6px;margin-top:14px;display:flex}.link-btn{color:var(--text-dim);background:0 0;border:none;font-size:12.5px;text-decoration:underline}.link-btn:hover{color:var(--text)}.account-needed{background:#fffbeb;border:1px solid #fcd34d;border-radius:8px;margin-bottom:12px;padding:8px 11px;font-size:12.5px}.legal-links{gap:12px;margin-top:14px;display:flex}.legal-links a{color:#94a3b8;font-size:11px;text-decoration:none}.legal-links a:hover{color:var(--text-dim);text-decoration:underline}