:root{--color-bg:#f6f7f9;--color-surface:#fff;--color-border:#e2e5ea;--color-border-strong:#cbd1db;--color-text:#1a1d23;--color-text-secondary:#6b7280;--color-primary:#4a90d9;--color-primary-hover:#3d7dc0;--color-primary-soft:#4a90d91f;--color-danger:#dc3545;--color-danger-hover:#c22836;--color-danger-soft:#fff5f5;--color-button-hover:#f0f3f7;--color-button-active:#e6ebf1;--color-primary-active:#336aab;--color-danger-border:#f3c8cc;--color-danger-hover-soft:#ffe8ea;--color-busy-bg:#ffffffe6;--color-overlay:#10182873;--radius:8px;--radius-lg:14px;--shadow-sm:0 1px 2px #1018280f;--shadow-md:0 4px 16px #1018281f;color:var(--color-text);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif}:root[data-theme=dark]{--color-bg:#151a22;--color-surface:#1d2430;--color-border:#303a49;--color-border-strong:#465365;--color-text:#eef2f7;--color-text-secondary:#aab4c2;--color-primary:#68a9ed;--color-primary-hover:#7bb7f3;--color-primary-soft:#68a9ed2e;--color-danger:#ff7783;--color-danger-hover:#ff8b95;--color-danger-soft:#351f27;--color-button-hover:#283241;--color-button-active:#323e50;--color-primary-active:#4b91d8;--color-danger-border:#70404a;--color-danger-hover-soft:#47262f;--color-busy-bg:#1d2430eb;--color-overlay:#04070cad;--shadow-sm:0 1px 2px #00000047;--shadow-md:0 6px 20px #0000006b;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*,:before,:after{box-sizing:border-box}body{background:var(--color-bg);margin:0}#root{height:100svh}.app{flex-direction:column;height:100%;display:flex}button,input,select{font:inherit;color:var(--color-text)}button{background:var(--color-surface);border:1px solid var(--color-border-strong);border-radius:var(--radius);cursor:pointer;padding:7px 14px;font-weight:500;transition:background-color .15s,border-color .15s,box-shadow .15s}button:hover:not(:disabled){background:var(--color-button-hover);border-color:var(--color-primary)}button:active:not(:disabled){background:var(--color-button-active)}button:disabled{opacity:.45;cursor:not-allowed}.btn-primary{color:#fff;background:var(--color-primary);border-color:var(--color-primary);box-shadow:var(--shadow-sm)}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);border-color:var(--color-primary-hover);box-shadow:var(--shadow-md)}.btn-primary:active:not(:disabled){background:var(--color-primary-active);border-color:var(--color-primary-active)}button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--color-primary);outline-offset:1px}input[type=text],input[type=number],select{background:var(--color-surface);border:1px solid var(--color-border-strong);border-radius:var(--radius);padding:6px 8px;transition:border-color .15s,box-shadow .15s}input[type=text]:focus,input[type=number]:focus,select:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-soft);outline:none}.app-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-sm);align-items:center;gap:10px;padding:12px 24px;display:flex}.app-brand{align-items:center;gap:8px;margin-right:8px;display:flex}.app-brand-mark{border-radius:7px;width:28px;height:28px;display:block}.app-header h1{letter-spacing:-.01em;margin:0;font-size:19px;font-weight:800}.app-danger-button{color:var(--color-danger);background:var(--color-danger-soft);border-color:var(--color-danger-border)}.app-danger-button:hover:not(:disabled){background:var(--color-danger-hover-soft);border-color:var(--color-danger)}.app-hamburger{color:var(--color-text);justify-content:center;align-items:center;padding:8px 11px;display:inline-flex}.gs-cta{border:1px solid var(--color-primary);background:var(--color-primary-soft);border-radius:var(--radius);align-items:stretch;display:inline-flex;overflow:hidden}.gs-cta-open,.gs-cta-dismiss{color:var(--color-primary);cursor:pointer;background:0 0;border:none;font-weight:600}.gs-cta-open{padding:7px 10px}.gs-cta-open:hover{background:var(--color-primary);color:#fff}.gs-cta-dismiss{border-left:1px solid var(--color-primary);padding:0 9px;font-size:16px;line-height:1}.gs-cta-dismiss:hover{background:var(--color-primary);color:#fff}.menu{display:inline-flex;position:relative}.menu-popover{z-index:20;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);min-width:190px;box-shadow:var(--shadow-md);flex-direction:column;gap:2px;padding:6px;display:flex;position:absolute;top:calc(100% + 6px)}.menu-popover-left{left:0}.menu-popover-right{right:0}.menu-label{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-secondary);padding:6px 10px 2px;font-size:11px;font-weight:700}.menu-item{border-radius:var(--radius);width:100%;font:inherit;text-align:left;color:var(--color-text);cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;gap:10px;padding:7px 10px;display:flex}.menu-item:hover:not(:disabled){background:var(--color-primary-soft);border-color:#0000}.menu-divider{background:var(--color-border);height:1px;margin:4px 6px}.export-split{margin-left:auto;display:inline-flex}.export-main{border-top-right-radius:0;border-bottom-right-radius:0}.export-caret{border-left:1px solid #ffffff59;border-top-left-radius:0;border-bottom-left-radius:0;padding-left:9px;padding-right:9px}.app-body{flex:1;min-height:0;display:flex}.controls-panel{background:var(--color-surface);border-right:1px solid var(--color-border);flex-direction:column;gap:10px;width:260px;padding:16px;display:flex;overflow-y:auto}.controls-panel h3{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-secondary);margin:14px 0 0;font-size:11px;font-weight:700}.field{flex-direction:column;gap:4px;font-size:13px;display:flex}.field>span{color:var(--color-text-secondary);font-size:12px;font-weight:600}.field input,.field select{padding:5px 8px;font-size:13px}.field-slider{width:100%;min-width:0;accent-color:var(--color-primary);margin:0;padding:0}.field-row{align-items:center;gap:8px;display:flex}.field-number{flex:none;width:84px}.field-fraction{text-align:right;color:var(--color-primary);font-variant-numeric:tabular-nums;white-space:nowrap;flex:1;font-size:13px;font-weight:600}.field-fraction-snap{cursor:pointer;text-underline-offset:2px;background:0 0;border:none;padding:0;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.field-fraction-snap:hover{color:var(--color-primary-hover)}.radio-group{flex-wrap:wrap;gap:6px 12px;display:flex}.radio-option{cursor:pointer;align-items:center;gap:5px;font-size:13px;font-weight:500;display:inline-flex}.radio-option input[type=radio]{accent-color:var(--color-primary);cursor:pointer}.checkbox-option{cursor:pointer;align-items:center;gap:6px;font-size:13px;font-weight:500;display:flex}.checkbox-option input[type=checkbox]{accent-color:var(--color-primary);cursor:pointer}.controls-group{margin-top:4px}.controls-group summary{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;font-size:11px;font-weight:700}.controls-group-body{flex-direction:column;gap:10px;margin-top:10px;display:flex}.error{color:var(--color-danger);font-size:12px}.viewport{flex-direction:column;flex:1;min-width:0;display:flex;position:relative}.mesh-warning{z-index:1;background:var(--color-danger-soft);border:1px solid var(--color-danger);border-radius:var(--radius);box-shadow:var(--shadow-sm);margin:0;padding:8px 12px;position:absolute;top:8px;left:8px;right:8px}.three-d-pane{flex:1;min-height:0;position:relative}.viewport-toolbar{z-index:2;gap:8px;display:flex;position:absolute;top:12px;left:12px}.viewport-busy{z-index:2;color:var(--color-text-secondary);background:var(--color-busy-bg);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:4px 10px;font-size:12px;font-weight:600;position:absolute;top:14px;right:12px}.controls-hint{color:var(--color-text-secondary);margin:0;font-size:12px}.cell-walls{align-self:center;width:100%;max-width:210px;height:auto}.cell-split{cursor:pointer}.cell-split-cell{fill:var(--color-primary-soft);stroke:var(--color-primary);stroke-width:1.2px}.cell-split:hover .cell-split-cell{fill:var(--color-primary)}.cell-split-line{stroke:var(--color-primary);stroke-width:2px;stroke-linecap:round}.cell-split:hover .cell-split-line{stroke:#fff}.cell-walls-face{fill:var(--color-primary-soft);stroke:none}.cell-wall{stroke-linecap:round}.cell-wall-outer{stroke:var(--color-border-strong);stroke-width:4px}.cell-wall-inner{stroke:var(--color-primary);stroke-width:4px}.cell-wall-delete{cursor:pointer}.cell-wall-delete circle{fill:var(--color-danger)}.cell-wall-delete:hover circle{fill:var(--color-danger-hover)}.cell-wall-delete-x{stroke:#fff;stroke-width:1.6px;stroke-linecap:round;pointer-events:none}.about-overlay{background:var(--color-overlay);z-index:10;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.about-panel{background:var(--color-surface);color:var(--color-text);border-radius:var(--radius-lg);width:90%;max-width:420px;max-height:80vh;box-shadow:var(--shadow-md);padding:24px;position:relative;overflow-y:auto}.about-close{cursor:pointer;color:var(--color-text-secondary);background:0 0;border:none;padding:4px;font-size:20px;line-height:1;position:absolute;top:8px;right:8px}.about-close:hover{color:var(--color-text);background:0 0}.about-panel h2{margin-top:0;font-size:18px}.about-panel h3{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-secondary);margin:20px 0 8px;font-size:12px;font-weight:700}.about-copyright{color:var(--color-text-secondary);font-size:12px}.about-notices{flex-direction:column;gap:4px;margin:0;padding:0;font-size:12px;list-style:none;display:flex}.gs-steps,.gs-tips{flex-direction:column;gap:6px;margin:0;padding-left:20px;font-size:13px;line-height:1.5;display:flex}