:root{--bg: #f2f4f7;--panel: #ffffff;--line: #1f2937;--accent: #d9480f;--muted: #6b7280;--danger: #b91c1c}*{box-sizing:border-box}html,body{margin:0;height:100%}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:radial-gradient(circle at 10% 10%,#fff,#e6ebf3 75%);color:var(--line);height:100vh;overflow:hidden;display:flex;flex-direction:column}#root{flex:1 1 auto;min-height:0;display:flex;flex-direction:column}.topbar{padding:1rem 1.25rem;border-bottom:1px solid #d9dde5;background:#ffffffd9;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);flex:0 0 auto}.topbar-inner{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem 1.5rem;flex-wrap:wrap}.topbar-brand{display:flex;align-items:center;gap:.85rem}.topbar-copy{min-width:0}.app-logo{width:52px;height:52px;flex:0 0 auto;filter:drop-shadow(0 4px 10px rgba(15,23,42,.08))}.topbar h1{margin:0;font-size:1.3rem}.topbar p{margin:.2rem 0 0;color:var(--muted)}.layout{display:grid;grid-template-columns:320px 1fr;gap:12px;padding:12px;flex:1 1 auto;min-height:0;overflow:hidden}.panel{background:var(--panel);border:1px solid #d9dde5;border-radius:10px;padding:12px;overflow-y:auto;min-height:0}.sidebar-tabs{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;align-self:center}.sidebar-tabs button{width:auto;min-width:112px;margin-bottom:0;padding-inline:14px}.tab-panel.hidden{display:none}.tool-group{border:1px solid #e3e6ec;border-radius:8px;padding:10px;margin-bottom:10px}.tool-group label:not(.file-label){display:block;font-size:.82rem;color:var(--muted);margin-bottom:4px}.tool-group input[type=text],.tool-group input[type=number],.tool-group input[type=range],.tool-group input[type=color],.tool-group select{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px;margin-bottom:6px}.material-list{display:grid;gap:8px}.material-item{border:1px solid #e3e6ec;border-radius:8px;padding:8px;background:#fafcff}.material-item label{display:block;font-size:.8rem;color:var(--muted);margin:4px 0 3px}.material-item input[type=text],.material-item input[type=number],.material-item input[type=color],.material-item select{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px;margin-bottom:5px}.material-status{margin:4px 0 0;font-size:.84rem;color:#475569}.load-item{border:1px solid #e3e6ec;border-radius:8px;padding:8px;background:#fafcff}.load-item h4{margin:0 0 6px;font-size:.9rem}.load-item p{margin:0 0 8px;font-size:.8rem;color:var(--muted)}.load-item label{display:block;font-size:.8rem;color:var(--muted);margin:4px 0 3px}.load-item input,.load-item select{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px;margin-bottom:5px}.compute-results{display:grid;gap:6px;font-size:.84rem;color:#475569}.compute-results p{margin:0}.experimental-gw-condition{border:1px solid #e3e6ec;border-radius:8px;padding:8px;background:#fafcff}.experimental-gw-condition p{margin:0 0 6px}.compute-fs-lambda-plot{margin-top:8px;padding-top:8px;border-top:1px solid #e3e6ec}.compute-fs-lambda-plot h4{margin:0 0 8px;font-size:.88rem;color:#334155}.compute-fs-lambda-svg{width:100%;height:auto;display:block;background:#fafcff;border:1px solid #e3e6ec;border-radius:8px}.compute-fs-axis{stroke:#94a3b8;stroke-width:1}.compute-fs-axis-label,.compute-fs-tick{fill:#64748b;font-size:10px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.compute-fs-force-line{fill:none;stroke:#2563eb;stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.compute-fs-moment-line{fill:none;stroke:#dc2626;stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.compute-fs-solved-line{stroke:#0f172a;stroke-width:1;stroke-dasharray:4 3}.compute-fs-legend{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px;font-size:.78rem;color:#475569}.compute-fs-legend span{display:inline-flex;align-items:center;gap:6px}.compute-fs-swatch{width:12px;height:2px;display:inline-block}.compute-fs-force-swatch{background:#2563eb}.compute-fs-moment-swatch{background:#dc2626}.compute-iteration-summary{margin-top:10px;padding-top:10px;border-top:1px solid #e3e6ec}.compute-iteration-summary h4{margin:0 0 8px;font-size:.88rem;color:#334155}.compute-iteration-list{display:grid;gap:6px;font-size:.82rem;color:#475569}.compute-iteration-list p{margin:0}.compute-progress{display:grid;gap:6px;margin-top:8px}.compute-progress.hidden{display:none}.compute-progress progress{width:100%;height:12px}.solver-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:24px;background:#0f172a66;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.solver-modal.hidden{display:none}.solver-modal-card{width:min(980px,100%);max-height:min(720px,100%);overflow:auto;display:grid;gap:14px;padding:18px;background:#fff;border:1px solid #d9dde5;border-radius:14px;box-shadow:0 24px 60px #0f172a3d}.solver-modal-header h3,.solver-modal-chart-header h4{margin:0}.solver-modal-progress{display:grid;gap:6px}.solver-modal-progress progress{width:100%;height:14px}.solver-modal-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.solver-modal-stat{border:1px solid #e3e6ec;border-radius:10px;padding:10px 12px;background:#f8fafc}.solver-modal-stat span{display:block;margin-bottom:4px;font-size:.76rem;color:#64748b;text-transform:uppercase;letter-spacing:.03em}.solver-modal-stat strong{font-size:1rem;color:#0f172a}.solver-modal-chart{display:grid;gap:8px}.solver-modal-top-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.solver-modal-diagnostics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.solver-modal-diagnostic-row{border:1px solid #e3e6ec;border-radius:10px;padding:8px 10px;background:#f8fafc}.solver-modal-diagnostic-row span{display:block;margin-bottom:4px;font-size:.74rem;color:#64748b;text-transform:uppercase;letter-spacing:.03em}.solver-modal-diagnostic-row strong{color:#0f172a;font-size:.95rem}.solver-modal-chart-header{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}.solver-modal-graph{min-height:260px;padding:10px;border:1px solid #d9dde5;border-radius:10px;background:linear-gradient(180deg,#fff,#f8fbff)}.solver-modal-graph svg{width:100%;height:auto;display:block}.solver-modal-viewport{padding:10px;border:1px solid #d9dde5;border-radius:10px;background:linear-gradient(180deg,#fff,#f8fbff)}.solver-modal-viewport canvas{width:100%;height:auto;display:block;border-radius:6px;background:#fff}@media(max-width:900px){.solver-modal-top-row{grid-template-columns:minmax(0,1fr)}}.solver-modal-graph-empty{margin:0;color:#64748b}.solver-modal-timings{display:grid;gap:6px;padding:10px;border:1px solid #d9dde5;border-radius:10px;background:linear-gradient(180deg,#fff,#f8fbff)}.solver-modal-timing-row{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(88px,.7fr) minmax(88px,.7fr);gap:10px;align-items:center;font-size:.88rem}.solver-modal-timing-row span{color:#475569}.solver-modal-timing-row strong{color:#0f172a;text-align:right}.solver-modal-timing-subrow{padding-left:14px}.solver-modal-timing-subrow span{color:#64748b}.solver-modal-timing-head{padding-bottom:6px;border-bottom:1px solid #e3e6ec}.solver-modal-timing-head span{font-size:.76rem;color:#64748b;text-transform:uppercase;letter-spacing:.03em}.solver-modal-axis{stroke:#94a3b8;stroke-width:1}.solver-modal-axis-label,.solver-modal-tick{fill:#64748b;font-size:10px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.solver-modal-grid{stroke:#e2e8f0;stroke-width:1}.solver-modal-tolerance{stroke:#d97706;stroke-width:1.5;stroke-dasharray:5 4}.solver-modal-line{fill:none;stroke:#2563eb;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}.material-row{display:grid;grid-template-columns:18px 1fr;gap:8px;align-items:center}.material-swatch{width:14px;height:14px;border-radius:3px;border:1px solid #9ca3af}.tool-group h3{margin:0 0 8px;font-size:.95rem}button,.file-label{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:8px 10px;margin-bottom:6px;background:#fff;font-weight:600;cursor:pointer;display:block;text-align:center;color:var(--line);font-size:1rem;font-family:inherit;line-height:1.2;margin-top:0}button:hover,.file-label:hover{border-color:#9ca3af}button:disabled{cursor:not-allowed;opacity:.5}.hidden-file-input{display:none}.toggle-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;padding:4px 2px;font-weight:600}.inline-toggle{margin:4px 0 8px;font-size:.84rem}.inline-toggle input{margin:0}.toggle-row input{width:16px;height:16px}button.danger{border-color:#f1b7b7;color:var(--danger)}button.active{background:#e8f0ff;border-color:#8fb0e8}.vertex-editor{border-top:1px solid #e3e6ec;margin-top:8px;padding-top:8px}.vertex-editor label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:4px}.vertex-editor input{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px;margin-bottom:6px}.vertex-editor.hidden,#import-json{display:none}ul{margin:0;padding-left:16px;color:var(--muted)}.canvas-wrap{position:relative;background:#fff;border:1px solid #d9dde5;border-radius:10px;overflow:hidden;height:100%;min-height:0}#cad-canvas{width:100%;height:100%;display:block;background:#fff}.plot-toolbar{position:absolute;top:10px;left:64px;z-index:10;background:#fffffff0;border:1px solid #d9dde5;border-radius:8px;padding:8px;min-width:170px}.plot-toolbar-toggle{position:absolute;top:10px;left:64px;z-index:10;width:auto;min-width:140px;margin-bottom:0;background:#fffffff0}.plot-toolbar-group{margin-bottom:6px}@media(max-width:720px){.solver-modal{padding:12px}.solver-modal-card{padding:14px}.solver-modal-stats{grid-template-columns:1fr}.solver-modal-chart-header{flex-direction:column;align-items:flex-start}}.plot-toolbar-group:last-child{margin-bottom:0}.plot-toolbar button{margin-bottom:6px}.plot-toolbar .toggle-row{margin-bottom:4px}.plot-toolbar .toggle-row:last-child{margin-bottom:0}.draw-command-bar{position:absolute;right:12px;bottom:32px;z-index:20;display:grid;grid-template-columns:1fr;gap:4px;width:min(360px,calc(100% - 24px));padding:8px;border:1px solid #d9dde5;border-radius:8px;background:#fffffff0}.draw-command-bar label{font-size:.75rem;font-weight:600;color:#475569}.draw-command-bar input{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px;font-size:.9rem}.draw-command-bar input:disabled{background:#f8fafc;color:#94a3b8}.grid-row{display:grid;grid-template-columns:1fr 84px;align-items:center;gap:8px;margin-bottom:8px;font-weight:600}.grid-row input{width:100%;border:1px solid #c8cfda;border-radius:6px;padding:6px 8px}@media(max-width:980px){.topbar-inner{align-items:stretch}.sidebar-tabs{justify-content:flex-start}.sidebar-tabs button{flex:1 1 140px}.layout{grid-template-columns:1fr}#cad-canvas{height:100%}}