:root{--bg: #eef1f6;--surface: #ffffff;--surface-2: #f8fafc;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #0f172a;--text-2: #475569;--text-3: #334155;--muted: #64748b;--line: #94a3b8;--line-soft: #eef2f7;--danger: #ef4444;--primary: #2563eb;--primary-700: #1d4ed8;--ok-bg: #dcfce7;--ok-fg: #15803d;--fail-bg: #fee2e2;--fail-fg: #b91c1c;--warn-bg: #fef3c7;--warn-fg: #b45309;--radius: 10px;--shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 2px 8px rgba(15, 23, 42, .05);--focus-ring: color-mix(in srgb, var(--primary) 55%, transparent);--topbar-bg: rgba(255, 255, 255, .85);color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;color:var(--text)}:root[data-theme=dark]{--bg: #0b111d;--surface: #141d2e;--surface-2: #1b2740;--border: #26334a;--border-strong: #3a4a67;--text: #e6ebf3;--text-2: #b3c0d4;--text-3: #cad4e3;--muted: #8896ac;--line: #55688a;--line-soft: #223049;--danger: #f87171;--primary: #60a5fa;--primary-700: #3b82f6;--ok-bg: #123524;--ok-fg: #4ade80;--fail-bg: #3b1a1e;--fail-fg: #fca5a5;--warn-bg: #3a2f15;--warn-fg: #fcd34d;--shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 2px 10px rgba(0, 0, 0, .5);--topbar-bg: rgba(12, 18, 30, .85);color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:var(--bg)}:where(button,summary,[role=tab],select,[role=separator]):focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}.app{min-height:100vh}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 16px;padding:12px 20px;background:var(--topbar-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:baseline;gap:10px}.brand h1{font-size:18px;margin:0;letter-spacing:-.01em}.brand-sub{color:var(--muted);font-size:13px}.topbar-actions{display:flex;align-items:center;flex-wrap:wrap;gap:10px 14px}.topbar-status{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.topbar-buttons{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.topbar-status:not(:empty)+.topbar-buttons{border-left:1px solid var(--border);padding-left:14px}.badge{font-weight:600;font-size:12px;padding:5px 10px;border-radius:999px}.badge.ok{background:var(--ok-bg);color:var(--ok-fg)}.badge.fail{background:var(--fail-bg);color:var(--fail-fg)}.badge.stale{background:var(--warn-bg);color:var(--warn-fg)}.alert{padding:10px 14px;font-size:13px;border:1px solid var(--border);border-left:3px solid var(--muted);border-radius:var(--radius);margin-bottom:16px}.alert .muted{color:var(--muted)}.alert-info{border-left-color:var(--primary)}.alert-warn{background:var(--warn-bg);color:var(--warn-fg);border-color:var(--warn-fg)}.alert-error{background:var(--fail-bg);color:var(--fail-fg);border-color:var(--fail-fg)}.page-alert{margin:12px 20px 0}button.calc{padding:9px 22px;font-size:14px;font-weight:600;color:#fff;background:var(--primary);border:none;border-radius:8px;cursor:pointer;transition:background .12s ease}button.calc:hover:not(:disabled){background:var(--primary-700)}button.calc:disabled{background:#94a3b8;cursor:default}button.ghost{padding:9px 16px;font:inherit;font-weight:600;color:var(--text-3);background:var(--surface);border:1px solid var(--border-strong);border-radius:8px;cursor:pointer;transition:border-color .12s ease,background .12s ease}button.ghost:hover{border-color:var(--primary);color:var(--primary)}button.ghost.tiny{padding:2px 7px;font-size:12px;border-radius:5px}button.theme-toggle{padding:6px 9px;font-size:15px;line-height:1}.param-details{margin-top:8px}.param-details>summary{cursor:pointer;color:var(--muted);font-size:12px;-webkit-user-select:none;user-select:none;padding:4px 0}.param-details>summary:before{content:"▸ "}.param-details[open]>summary:before{content:"▾ "}.param-details .derived{margin-top:6px}.user-material-block{margin-top:12px;display:flex;flex-direction:column;gap:6px}.user-material-foot{display:flex;align-items:center;gap:12px;margin-top:8px}.field-error{color:var(--fail-fg);font-size:12px}.layout{display:grid;grid-template-columns:360px 8px minmax(0,1fr);gap:0;align-items:start;padding:20px}.layout.dragging{cursor:col-resize;-webkit-user-select:none;user-select:none}.layout.stacked{grid-template-columns:minmax(0,1fr);gap:16px}.layout.stacked .resizer{display:none}.layout.stacked .inputs{position:static;top:auto}.resizer{align-self:start;position:sticky;top:72px;height:calc(100vh - 92px);cursor:col-resize;background:linear-gradient(var(--border-strong),var(--border-strong)) center / 2px 100% no-repeat;border-radius:2px;transition:background-size .12s ease}.resizer:hover,.layout.dragging .resizer{background-image:linear-gradient(var(--primary),var(--primary));background-size:4px 100%}.inputs{position:sticky;top:72px;display:flex;flex-direction:column;gap:14px;min-width:0}.input-panel{display:flex;flex-direction:column;gap:14px;min-width:0}.input-tabs{display:flex;flex-wrap:wrap;gap:4px;padding:4px;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius)}.input-tab{flex:1 1 auto;padding:7px 10px;border:1px solid transparent;border-radius:7px;background:transparent;color:var(--muted);font:inherit;font-size:12px;font-weight:600;white-space:nowrap;cursor:pointer;transition:background .12s ease,color .12s ease}.input-tab:hover{color:var(--text)}.input-tab.active{background:var(--surface);color:var(--primary);border-color:var(--border);box-shadow:var(--shadow)}fieldset{border:1px solid var(--border);border-radius:var(--radius);margin:0;padding:12px 14px 14px;background:var(--surface);box-shadow:var(--shadow);min-width:0}legend{font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:0 6px}.field{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:5px 0}.field-label{color:var(--text-2)}.field input,.field select{width:150px;padding:5px 8px;border:1px solid var(--border-strong);border-radius:6px;background:var(--surface);color:var(--text);font:inherit;text-align:right}.field select{text-align:left}.field input:hover,.field select:hover,td input:hover{border-color:var(--muted)}.field input:focus,.field select:focus,td input:focus{outline:2px solid color-mix(in srgb,var(--primary) 35%,transparent);border-color:var(--primary)}.force-grid,.derived{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}.force-grid .field input,.derived .field input{width:84px}.results{min-width:0}.placeholder-hero{background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--radius);padding:48px 24px;text-align:center;color:var(--muted)}.plot-loading{display:grid;place-items:center;min-height:320px;color:var(--muted)}.plot-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}@media(max-width:1100px){.plot-grid{grid-template-columns:minmax(0,1fr)}}.plot-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.plot-card-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px;padding:11px 14px;border-bottom:1px solid var(--border)}.plot-card-head h3{font-size:14px;margin:0}.plot-card-sub{color:var(--muted);font-size:12px}.plot-card-body{padding:10px 12px 12px}.plot-svg{width:100%;height:auto;display:block}.plot-empty{color:var(--muted);padding:24px;text-align:center}.section3d{display:flex;flex-direction:column;gap:8px}.canvas3d{width:100%;border-radius:8px;background:#0f172a;overflow:hidden}.canvas3d canvas{display:block}.section3d.v-dragging{cursor:row-resize;-webkit-user-select:none;user-select:none}.resizer-h{height:8px;cursor:row-resize;background:linear-gradient(var(--border-strong),var(--border-strong)) center / 100px 2px no-repeat;border-radius:2px;transition:background-size .12s ease}.resizer-h:hover,.section3d.v-dragging .resizer-h{background-image:linear-gradient(var(--primary),var(--primary));background-size:140px 4px}.values-ctl{display:inline-flex;align-items:center;gap:8px;margin-left:auto}.values-count{display:inline-flex;align-items:center;gap:6px}.values-count input[type=range]{width:110px;accent-color:var(--primary)}.values-n{font-size:12px;color:var(--text-2);min-width:2ch;text-align:right}.legend-3d{display:flex;flex-wrap:wrap;align-items:center;gap:16px;font-size:12px;color:var(--text-3)}.legend-3d i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}.legend-3d .muted{color:var(--muted);margin-left:auto}.legend-3d .ur-ramp{display:inline-block;width:96px;height:10px;border-radius:5px;background:linear-gradient(90deg,#20c53c,#b8c520,#c52020,#dc2626)}.plot-card .section3d{margin:0}.plot-card-body:has(.section3d){padding:12px}.grid line{stroke:var(--line-soft);stroke-width:1}.axis-zero{stroke:var(--line);stroke-width:1.2}.curve{fill:none;stroke:var(--primary);stroke-width:2;stroke-linejoin:round}.ticks text{font-size:10px;fill:var(--muted)}.axis-label{font-size:11px;fill:var(--text-2)}.anno text{font-size:10px;fill:var(--text-3);font-weight:600}.profile-area{fill:color-mix(in srgb,var(--primary) 14%,transparent);stroke:none}.extreme circle{fill:var(--danger)}.extreme text{font-size:10px;fill:var(--text-3);font-weight:600}.check{display:flex;align-items:center;gap:8px;margin:6px 0;cursor:pointer}.check input{width:16px;height:16px;accent-color:var(--primary)}.field-hint{margin:6px 0 0;font-size:11px;color:var(--muted)}.series-groups{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}.series-group{display:flex;flex-direction:column;gap:4px}.series-group-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.series-chips{display:flex;flex-wrap:wrap;gap:6px}.chip{font:inherit;font-size:12px;padding:3px 10px;border:1px solid var(--border-strong);border-radius:999px;background:var(--surface);color:var(--text-2);cursor:pointer}.chip:hover{border-color:var(--primary)}.chip.active{background:var(--primary);border-color:var(--primary);color:#fff}.diagram-strip{display:flex;flex-direction:column;gap:16px}.diagram-group h4{margin:0 0 8px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);border-bottom:1px solid var(--border);padding-bottom:4px}.diagram-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}.mini{margin:0}.mini figcaption{font-size:11px;font-weight:600;color:var(--text-3);text-align:center;margin-bottom:2px}.mini figcaption span{color:var(--muted);font-weight:400}.mini-empty{font-size:11px;color:var(--muted);padding:12px}.section-view{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(150px,.9fr);gap:12px;align-items:center}.rebar-legend{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;font-size:12px}.rebar-legend li{display:grid;grid-template-columns:12px auto;grid-template-areas:"sw id" "sw meta" "sw ur";column-gap:8px;row-gap:1px;align-items:center}.rebar-legend .swatch{grid-area:sw;width:12px;height:12px;border-radius:3px;align-self:start;margin-top:2px}.rebar-legend .swatch-stirrup{border-radius:0;background:linear-gradient(var(--text-3),var(--text-3)) center / 3px 100% no-repeat}.rebar-id{grid-area:id;font-weight:600}.rebar-meta{grid-area:meta;color:var(--muted);font-variant-numeric:tabular-nums}.rebar-ur{grid-area:ur;font-weight:600;font-variant-numeric:tabular-nums}@media(max-width:1100px){.section-view{grid-template-columns:minmax(0,1fr)}}.data-tables{margin-top:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.data-tables>summary{cursor:pointer;font-weight:600;padding:12px 16px;list-style:none;-webkit-user-select:none;user-select:none}.data-tables>summary:before{content:"▸ ";color:var(--muted)}.data-tables[open]>summary:before{content:"▾ "}.data-tables[open]>summary{border-bottom:1px solid var(--border)}.data-tables .result-grid{margin:14px 16px}.result-grid h3{font-size:13px;margin:0 0 6px;color:var(--text-3)}.table-scroll{overflow-x:auto;background:var(--surface);border:1px solid var(--border);border-radius:8px}table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}th,td{padding:4px 9px;text-align:right;white-space:nowrap;border-bottom:1px solid var(--border)}th{background:var(--surface-2);position:sticky;top:0;font-weight:600}td.row-index,th:first-child{text-align:left;color:var(--muted)}.rebar-editor th,.rebar-editor td{padding:3px 5px}.rebar-editor td input{width:52px}td input{width:78px;padding:3px 5px;text-align:right;border:1px solid var(--border-strong);border-radius:5px;background:var(--surface);color:var(--text);font:inherit}.loading{color:var(--muted);padding:24px}.report-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#e2e8f0;overflow:auto;--surface: #ffffff;--surface-2: #f8fafc;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #0f172a;--text-2: #475569;--text-3: #334155;--muted: #64748b;color:var(--text)}.report-toolbar{position:sticky;top:0;display:flex;gap:10px;justify-content:flex-end;padding:12px 20px;background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.report{max-width:960px;margin:20px auto;background:#fff;padding:32px 40px;box-shadow:var(--shadow)}.report-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;border-bottom:2px solid var(--text);padding-bottom:12px}.report-head h1{margin:0;font-size:24px}.report-sub{margin:4px 0 0;color:var(--muted)}.report-verdict{display:flex;flex-direction:column;align-items:flex-end;font-size:13px}.report-verdict.ok{color:var(--ok-fg)}.report-verdict.over{color:var(--fail-fg)}.report-ur{font-size:26px;font-weight:700}.report-block{margin-top:22px}.report-block>h2{font-size:15px;margin:0 0 10px;border-bottom:1px solid var(--border);padding-bottom:4px}.report-cols{display:grid;grid-template-columns:1fr 1fr;gap:24px}.report-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{display:flex;flex-direction:column;gap:2px;padding:10px 12px;background:var(--surface-2);border:1px solid var(--border);border-radius:8px}.metric-label{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}.metric-value{font-size:18px;font-weight:600}.metric-value.bad{color:var(--fail-fg)}table.kv{width:100%;border-collapse:collapse}table.kv th{text-align:left;color:var(--muted);font-weight:500;padding:3px 8px 3px 0;white-space:nowrap}table.kv td{text-align:right;font-variant-numeric:tabular-nums;padding:3px 0}.report-foot{margin-top:20px;color:var(--muted);font-size:12px}@media print{body{background:#fff}body *{visibility:hidden}.report-overlay,.report-overlay *{visibility:visible}.report-overlay{position:absolute;top:0;right:0;bottom:0;left:0;overflow:visible;background:#fff}.report{margin:0;max-width:none;box-shadow:none;padding:0}.no-print{display:none!important}.report-block{break-inside:avoid}.report-break{break-before:page}}