:root{--bg:#f1f5f9;--panel:#fff;--line:#e2e8f0;--line-strong:#cbd5e1;--text:#0f172a;--muted:#64748b;--accent:#2563eb;--accent-soft:#dbeafe;--warn:#b45309;--radius:6px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,sans-serif;font-size:13px}.app{flex-direction:column;height:100vh;display:flex}.topbar{background:var(--panel);border-bottom:1px solid var(--line-strong);flex-wrap:wrap;align-items:center;gap:10px;padding:6px 12px;display:flex}.brand{letter-spacing:.2px;color:var(--accent);margin-right:4px;font-weight:700}.sep{background:var(--line);align-self:stretch;width:1px;margin:2px}.spacer{flex:1}.status{color:var(--muted);text-align:right;min-width:90px}.status.error{color:#b91c1c}.field{color:var(--muted);align-items:center;gap:6px;display:inline-flex}.check{cursor:pointer;align-items:center;gap:5px;display:inline-flex}button{font:inherit;color:inherit}.btn{background:var(--panel);border:1px solid var(--line-strong);border-radius:var(--radius);cursor:pointer;align-items:center;gap:5px;padding:4px 10px;display:inline-flex}.btn:hover:not(:disabled){background:#f8fafc;border-color:#94a3b8}.btn:disabled{color:#94a3b8;cursor:default}.btn.small{padding:2px 8px;font-size:12px}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover:not(:disabled){background:#1d4ed8}.menu{position:relative}.menu-popover{z-index:20;background:var(--panel);border:1px solid var(--line-strong);border-radius:8px;min-width:230px;padding:4px;position:absolute;top:calc(100% + 4px);right:0;box-shadow:0 8px 24px #0f172a24}.menu-item{text-align:left;cursor:pointer;background:0 0;border:0;border-radius:4px;justify-content:space-between;align-items:center;gap:12px;width:100%;padding:6px 10px;display:flex}.menu-item:hover:not(:disabled){background:var(--accent-soft)}.menu-item:disabled{color:#94a3b8;cursor:default}.menu-item small{color:var(--muted)}.menu-check{cursor:pointer;align-items:center;gap:8px;padding:6px 10px;display:flex}.menu-sep{background:var(--line);height:1px;margin:4px 0}.menu-title{text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:4px 10px 2px;font-size:11px}.body{flex:1;min-height:0;display:flex}.canvas{background:#f8fafc;flex:1;min-width:0;min-height:0}.palette{background:var(--panel);border-right:1px solid var(--line-strong);flex-direction:column;flex:none;gap:3px;width:196px;padding:8px;display:flex;overflow-y:auto}.group-title{text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin:10px 4px 2px;font-size:11px}.tool{text-align:left;border-radius:var(--radius);cursor:pointer;background:0 0;border:1px solid #0000;align-items:center;gap:8px;width:100%;padding:6px 8px;display:flex}.tool:hover{background:#f1f5f9}.tool.active{background:var(--accent-soft);color:#1e3a8a;border-color:#93c5fd;font-weight:600}.tool svg{stroke:currentColor;fill:none;stroke-width:1.7px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:18px;height:18px}.tool-card{flex-direction:column;gap:2px;display:flex}.type-select{width:calc(100% - 34px);font:inherit;color:var(--muted);border:1px solid var(--line-strong);background:#fff;border-radius:4px;margin:0 0 4px 34px;padding:2px 4px;font-size:12px}.palette-action{justify-content:center;margin-top:4px}.side{background:var(--bg);border-left:1px solid var(--line-strong);flex-direction:column;flex:none;gap:8px;width:300px;padding:8px;display:flex;overflow-y:auto}.section{background:var(--panel);border:1px solid var(--line);border-radius:8px}.section-head{align-items:center;gap:6px;padding:6px 8px;display:flex}.section-toggle{text-align:left;cursor:pointer;background:0 0;border:0;flex:1;align-items:center;gap:6px;padding:0;font-weight:600;display:flex}.section-toggle .chev{width:10px;color:var(--muted);transition:transform .12s}.section-toggle .chev:before{content:"▾"}.section.closed .chev{transform:rotate(-90deg)}.section-body{border-top:1px solid var(--line);padding:2px 10px 10px}.section-body:empty{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:8px 10px}.statusbar{background:var(--panel);border-top:1px solid var(--line-strong);align-items:baseline;gap:16px;min-height:26px;padding:4px 12px;display:flex}.statusbar .hint{color:var(--muted)}.statusbar .message{color:var(--warn);text-align:right;margin-left:auto}.segmented{border:1px solid var(--line-strong);border-radius:var(--radius);display:inline-flex;overflow:hidden}.segmented button{background:var(--panel);cursor:pointer;border:0;padding:4px 12px}.segmented button+button{border-left:1px solid var(--line-strong)}.segmented button[aria-pressed=true]{background:var(--accent);color:#fff;font-weight:600}.canvas.hidden{display:none}.palette.disabled{opacity:.45;pointer-events:none}.view3d{width:100%;height:100%;position:relative}.view3d-canvas{position:absolute;inset:0}.view3d-panel{border:1px solid var(--line-strong);background:#ffffffeb;border-radius:8px;flex-direction:column;gap:4px;padding:8px 10px;display:flex;position:absolute;top:10px;left:10px}.view3d-title{text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin-top:4px;font-size:11px}.view3d-title:first-child{margin-top:0}.view3d-error{background:#fef3c7;border:1px solid #f59e0b;border-radius:8px;padding:10px 12px;position:absolute;top:10px;left:10px}.type-select-row{color:var(--muted);justify-content:space-between;align-items:center;gap:6px;margin:0 0 4px 34px;font-size:12px;display:flex}.type-select-row input{width:64px;font:inherit;border:1px solid var(--line-strong);border-radius:4px;padding:2px 4px;font-size:12px}.problem-line{color:#b45309;width:100%;font:inherit;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:4px;margin-top:4px;padding:2px 4px;display:block}.problem-line:hover,.problem-line:focus-visible{background:#fef3c7;text-decoration:underline}.plan-badge{color:#475569;background:#f8fafc;border:1px solid #cbd5e1;border-radius:999px;padding:2px 8px;font-size:12px}