:root{--bg-primary: #FAFBFD;--bg-secondary: #FFFFFF;--bg-tertiary: #F1F4F9;--bg-elevated: #F7F9FC;--bg-hover: #EDF1F7;--blue-50: #EFF6FF;--blue-100: #DBEAFE;--blue-200: #BFDBFE;--blue-300: #93C5FD;--blue-400: #60A5FA;--blue-500: #3B82F6;--blue-600: #2563EB;--blue-700: #1D4ED8;--blue-800: #1E40AF;--blue-900: #1E3A8A;--grid-primary: #3B82F6;--grid-secondary: #93C5FD;--grid-tertiary: rgba(59, 130, 246, .15);--grid-alpha-10: rgba(59, 130, 246, .1);--grid-alpha-20: rgba(59, 130, 246, .2);--grid-alpha-30: rgba(59, 130, 246, .3);--grid-cell-bg: rgba(59, 130, 246, .06);--grid-cell-border: rgba(59, 130, 246, .25);--accent-primary: #3B82F6;--accent-secondary: #2563EB;--accent-hover: #2563EB;--accent-glow: rgba(59, 130, 246, .2);--accent-alpha-10: rgba(59, 130, 246, .1);--valid-primary: #10B981;--valid-secondary: #059669;--valid-bg: #ECFDF5;--valid-alpha-40: rgba(16, 185, 129, .15);--invalid-primary: #EF4444;--invalid-secondary: #DC2626;--invalid-bg: #FEF2F2;--invalid-alpha-40: rgba(239, 68, 68, .1);--spacer-primary: #6366F1;--spacer-secondary: #4F46E5;--spacer-bg: rgba(99, 102, 241, .08);--spacer-alpha-40: rgba(99, 102, 241, .12);--text-primary: #0F172A;--text-secondary: #475569;--text-tertiary: #94A3B8;--text-muted: #CBD5E1;--border-primary: #E2E8F0;--border-secondary: #F1F5F9;--border-elevated: #E2E8F0;--border-focus: #3B82F6;--surface-overlay: rgba(0, 0, 0, .4);--surface-modal: #FFFFFF;--font-display: "DM Sans", system-ui, sans-serif;--font-body: "DM Sans", system-ui, sans-serif;--font-mono: "JetBrains Mono", "Courier New", monospace;--text-xs: .625rem;--text-sm: .75rem;--text-base: .875rem;--text-lg: 1rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.75rem;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--font-black: 700;--leading-tight: 1.25;--leading-normal: 1.5;--leading-relaxed: 1.75;--tracking-tight: -.025em;--tracking-normal: 0;--tracking-wide: .025em;--tracking-wider: .05em;--tracking-widest: .075em;--space-xs: .25rem;--space-sm: .5rem;--space-md: .75rem;--space-lg: 1rem;--space-xl: 1.5rem;--space-2xl: 2rem;--space-3xl: 3rem;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--radius-xl: 12px;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .06), 0 2px 4px -2px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .06), 0 4px 6px -4px rgba(0, 0, 0, .04);--sidebar-width: 240px;--bom-width: 200px;--preview-max-width: 700px;--container-max-width: 1400px;--header-height: 60px;font-family:DM Sans,system-ui,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}a{font-weight:500;color:var(--blue-500);text-decoration:inherit}a:hover{color:var(--blue-600)}body{margin:0;min-width:320px;min-height:100vh;background:var(--bg-primary);color:var(--text-primary);font-family:var(--font-body);line-height:var(--leading-normal)}h1{font-size:2.5em;line-height:1.1}button{border-radius:var(--radius-md);border:1px solid var(--border-primary);padding:.6em 1.2em;font-size:1em;font-weight:var(--font-medium);font-family:inherit;background-color:var(--bg-secondary);color:var(--text-primary);cursor:pointer;transition:all .2s}button:hover{border-color:var(--blue-500);background-color:var(--blue-50)}button:focus,button:focus-visible{outline:2px solid var(--blue-500);outline-offset:2px}input[type=number]{-moz-appearance:textfield}input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.app{max-width:var(--container-max-width);margin:0 auto;padding:var(--space-xl);display:flex;flex-direction:column;gap:var(--space-xl);min-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg);background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);height:var(--header-height);box-shadow:var(--shadow-sm)}.app-header h1{margin:0;font-family:var(--font-display);font-size:var(--text-2xl);font-weight:var(--font-black);letter-spacing:var(--tracking-widest);color:var(--text-primary)}.subtitle{display:none}.grid-controls{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-md) var(--space-lg);background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);margin-bottom:var(--space-xl);flex-wrap:wrap;font-family:var(--font-body);box-shadow:var(--shadow-sm)}.unit-toggle-compact,.format-toggle-compact{display:flex}.unit-toggle-compact button,.format-toggle-compact button{padding:.4rem .6rem;border:2px solid var(--border-secondary);background:transparent;color:inherit;cursor:pointer;font-size:var(--text-sm);font-family:var(--font-mono);font-weight:var(--font-medium);transition:all .2s}.unit-toggle-compact button:first-child,.format-toggle-compact button:first-child{border-radius:var(--radius-md) 0 0 var(--radius-md)}.unit-toggle-compact button:last-child,.format-toggle-compact button:last-child{border-radius:0 var(--radius-md) var(--radius-md) 0;border-left:none}.unit-toggle-compact button.active,.format-toggle-compact button.active{background:var(--grid-primary);border-color:var(--grid-primary);color:var(--bg-primary)}.unit-toggle-compact button:hover:not(.active),.format-toggle-compact button:hover:not(.active){border-color:var(--grid-primary);background:var(--bg-hover)}.format-toggle-compact button:first-child{border-left:2px solid var(--border-secondary)}.format-toggle-compact button.active:first-child{border-left-color:var(--grid-primary)}.dimension-inputs-row{display:flex;align-items:center;gap:.5rem}.dimension-inputs-row .dimension-input{display:flex;align-items:center;gap:.25rem}.dimension-inputs-row .dimension-input label{display:flex;align-items:center;gap:.25rem;flex-direction:row}.dimension-inputs-row .dimension-label{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--text-secondary);font-family:var(--font-body);text-transform:uppercase;letter-spacing:var(--tracking-wide)}.dimension-inputs-row .input-wrapper{display:flex;align-items:center;gap:.25rem}.dimension-inputs-row .dimension-input input{width:70px;padding:.4rem .5rem;border:2px solid var(--border-secondary);border-radius:var(--radius-md);background:var(--bg-secondary);color:var(--text-primary);font-size:var(--text-base);font-family:var(--font-mono);font-variant-numeric:tabular-nums}.dimension-inputs-row .dimension-input input:focus{outline:none;border-color:var(--grid-primary);box-shadow:0 0 0 3px var(--grid-alpha-10)}.dimension-inputs-row .unit-label{font-size:var(--text-sm);color:var(--text-tertiary);min-width:auto;font-family:var(--font-mono)}.dimension-separator{color:var(--text-tertiary);font-size:var(--text-base);font-family:var(--font-mono)}.grid-summary{display:flex;align-items:center;gap:var(--space-lg);margin-left:auto}.grid-summary-size{font-weight:var(--font-semibold);font-size:var(--text-base);font-family:var(--font-mono);color:var(--grid-primary);font-variant-numeric:tabular-nums}.grid-summary-gap{font-size:var(--text-sm);color:var(--text-secondary);font-family:var(--font-body)}.app-main{display:grid;grid-template-columns:var(--sidebar-width) 1fr var(--bom-width);gap:var(--space-xl);align-items:start;flex:1}.sidebar{display:flex;flex-direction:column;gap:var(--space-lg);width:var(--sidebar-width)}.bom-sidebar{display:flex;flex-direction:column;width:var(--bom-width)}.preview{display:flex;flex-direction:column;align-items:center;min-height:500px;background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);padding:var(--space-2xl)}.reference-image-toolbar{display:flex;align-items:center;gap:var(--space-md);width:100%;justify-content:flex-end;margin-bottom:var(--space-md)}.grid-preview{width:100%;max-width:var(--preview-max-width);display:flex;justify-content:center;align-items:center}.grid-preview.empty{border:2px dashed var(--border-secondary);border-radius:var(--radius-xl);color:var(--text-secondary)}.drawer-container{position:relative;width:100%;height:100%;border:2px solid var(--grid-primary);border-radius:var(--radius-xl);box-sizing:border-box;background:var(--bg-secondary);box-shadow:var(--shadow-sm)}.grid-container{display:grid;gap:2px;position:absolute;box-sizing:border-box}.grid-cell{background:var(--grid-cell-bg, rgba(59, 130, 246, .06));border:2px solid var(--grid-primary);border-radius:var(--radius-md);min-width:20px;min-height:20px}.spacer-controls{display:flex;align-items:center;gap:var(--space-md);font-size:var(--text-sm);font-family:var(--font-body)}.spacer-label{font-weight:var(--font-medium);color:var(--text-secondary);text-transform:uppercase;letter-spacing:var(--tracking-wide)}.spacer-group{display:flex;align-items:center;gap:var(--space-xs)}.spacer-axis-label{font-weight:var(--font-medium);color:var(--text-secondary);font-size:var(--text-sm);font-family:var(--font-mono)}.spacer-button-group{display:flex}.spacer-button-group button{padding:.4rem .6rem;border:2px solid var(--border-secondary);background:transparent;color:inherit;cursor:pointer;font-size:.7rem;font-family:var(--font-mono);font-weight:var(--font-medium);transition:all .2s;white-space:nowrap}.spacer-button-group button:first-child{border-radius:var(--radius-md) 0 0 var(--radius-md)}.spacer-button-group button:last-child{border-radius:0 var(--radius-md) var(--radius-md) 0;border-left:none}.spacer-button-group button:not(:first-child):not(:last-child){border-left:none}.spacer-button-group button.active{background:var(--spacer-primary);border-color:var(--spacer-primary);color:var(--text-primary)}.spacer-button-group button:hover:not(.active){border-color:var(--spacer-primary);background:var(--bg-hover)}.spacer-overlay{position:absolute;background:var(--spacer-alpha-40);pointer-events:none;z-index:0;box-sizing:border-box}.item-library{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);padding:var(--space-lg);box-shadow:var(--shadow-sm)}.item-library-title{margin:0 0 .25rem;font-size:var(--text-lg);font-family:var(--font-display);font-weight:var(--font-bold);letter-spacing:var(--tracking-wide);text-transform:uppercase;color:var(--text-primary)}.item-library-hint{margin:0 0 var(--space-lg);font-size:var(--text-sm);color:var(--text-secondary);font-family:var(--font-body)}.library-search{position:relative;margin-bottom:var(--space-lg)}.library-search-input{width:100%;padding:.5rem 2rem .5rem .75rem;border:2px solid var(--border-secondary);border-radius:var(--radius-lg);background:var(--bg-primary);color:var(--text-primary);font-size:var(--text-base);font-family:var(--font-body);box-sizing:border-box}.library-search-input:focus{outline:none;border-color:var(--grid-primary);box-shadow:0 0 0 3px var(--grid-alpha-10)}.library-search-input::placeholder{color:var(--text-tertiary)}.library-search-clear{position:absolute;right:.5rem;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--text-tertiary);font-size:1.5rem;cursor:pointer;padding:0;width:1.5rem;height:1.5rem;display:flex;align-items:center;justify-content:center;transition:color .2s}.library-search-clear:hover{color:var(--invalid-primary)}.toggle-filters-button{width:100%;padding:var(--space-sm) var(--space-md);margin-bottom:var(--space-md);background:var(--bg-secondary);border:2px solid var(--border-secondary);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--text-sm);font-family:var(--font-body);font-weight:var(--font-semibold);cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:var(--space-xs)}.toggle-filters-button:hover{border-color:var(--grid-primary);background:var(--bg-primary)}.filter-active-indicator{margin-left:auto;color:var(--grid-primary);font-size:var(--text-lg);line-height:1}.toggle-library-selector-button{width:100%;padding:var(--space-sm) var(--space-md);margin-bottom:var(--space-md);background:var(--bg-secondary);border:2px solid var(--border-secondary);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--text-sm);font-family:var(--font-body);font-weight:var(--font-semibold);cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:var(--space-xs)}.toggle-library-selector-button:hover{border-color:var(--grid-primary);background:var(--bg-primary)}.library-active-indicator{margin-left:auto;color:var(--grid-primary);font-size:var(--text-lg);line-height:1}.library-filters{margin-bottom:var(--space-lg);padding:var(--space-md);border:2px solid var(--border-secondary);border-radius:var(--radius-lg);background:var(--bg-secondary)}.filter-group{margin-bottom:var(--space-md)}.filter-group:last-of-type{margin-bottom:0}.filter-label{display:block;font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--text-primary);margin-bottom:var(--space-xs);font-family:var(--font-body)}.filter-options{display:flex;gap:var(--space-xs);flex-wrap:wrap}.filter-chip{padding:var(--space-xs) var(--space-md);border:2px solid var(--border-secondary);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-secondary);font-size:var(--text-sm);font-family:var(--font-body);cursor:pointer;transition:all .2s}.filter-chip:hover{border-color:var(--grid-primary);color:var(--text-primary)}.filter-chip.active{background:var(--grid-primary);border-color:var(--grid-primary);color:#fff;font-weight:var(--font-semibold)}.filter-clear-all{margin-top:var(--space-md);padding:var(--space-xs) var(--space-md);background:transparent;border:2px solid var(--invalid-primary);border-radius:var(--radius-md);color:var(--invalid-primary);font-size:var(--text-sm);font-family:var(--font-body);cursor:pointer;transition:all .2s;width:100%}.filter-clear-all:hover{background:var(--invalid-primary);color:#fff}.library-no-results{text-align:center;padding:var(--space-2xl) var(--space-lg);color:var(--text-secondary);font-size:var(--text-base);font-family:var(--font-body)}.library-loading,.library-error{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-2xl) var(--space-lg);text-align:center;color:var(--text-secondary);font-family:var(--font-body)}.library-error{color:var(--invalid-primary)}.error-message{font-size:var(--text-sm);margin-top:var(--space-sm);padding:var(--space-sm);background:var(--invalid-alpha-40);border-radius:var(--radius-md);font-family:var(--font-mono)}.export-library-button{width:100%;padding:.6rem;margin-bottom:var(--space-md);border:2px solid var(--valid-primary);border-radius:var(--radius-lg);background:transparent;color:var(--valid-primary);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.export-library-button:hover{background:var(--valid-primary);color:var(--bg-primary)}.export-library-button:active{background:var(--valid-secondary);border-color:var(--valid-secondary)}.manage-library-button{width:100%;padding:var(--space-md);margin-bottom:var(--space-lg);background:var(--spacer-primary);color:var(--text-primary);border:2px solid var(--spacer-primary);border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.manage-library-button:hover{background:var(--spacer-secondary);border-color:var(--spacer-secondary)}.manage-library-button:active{background:var(--spacer-primary);border-color:var(--spacer-primary)}.manage-categories-button{flex:1;padding:var(--space-md);background:var(--accent-primary);color:var(--text-primary);border:2px solid var(--accent-primary);border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.manage-categories-button:hover{background:var(--accent-secondary);border-color:var(--accent-secondary)}.manage-categories-button:active{background:var(--accent-primary);border-color:var(--accent-primary)}.library-manager-overlay{position:fixed;inset:0;background:var(--surface-overlay);display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--space-2xl)}.library-manager{background:var(--surface-modal);border:2px solid var(--border-primary);border-radius:var(--radius-xl);width:100%;max-width:600px;max-height:80vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.library-manager-header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-xl);border-bottom:2px solid var(--border-primary);position:sticky;top:0;background:var(--surface-modal);z-index:1}.library-manager-header h2{margin:0;font-size:var(--text-2xl);font-family:var(--font-display);font-weight:var(--font-black);letter-spacing:var(--tracking-wider);text-transform:uppercase;color:var(--text-primary)}.close-button{background:transparent;border:none;color:var(--text-tertiary);font-size:2rem;cursor:pointer;padding:0;width:2rem;height:2rem;display:flex;align-items:center;justify-content:center;transition:color .2s}.close-button:hover{color:var(--invalid-primary)}.library-manager-error{margin:var(--space-lg) var(--space-xl);padding:var(--space-lg);background:var(--invalid-alpha-40);border:2px solid var(--invalid-primary);border-radius:var(--radius-lg);color:var(--invalid-primary);font-size:var(--text-base);font-family:var(--font-body)}.library-manager-actions{padding:var(--space-xl);display:flex;gap:var(--space-md);border-bottom:2px solid var(--border-primary)}.add-item-button{flex:1;padding:var(--space-md);background:var(--valid-primary);color:var(--bg-primary);border:2px solid var(--valid-primary);border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.add-item-button:hover{background:var(--valid-secondary);border-color:var(--valid-secondary)}.reset-button{padding:var(--space-md) var(--space-xl);background:transparent;color:var(--invalid-primary);border:2px solid var(--invalid-primary);border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.reset-button:hover{background:var(--invalid-alpha-40)}.library-manager-list{padding:var(--space-xl)}.library-manager-list h3{margin:0 0 var(--space-lg);font-size:var(--text-lg);color:var(--text-secondary);font-family:var(--font-display);font-weight:var(--font-bold);letter-spacing:var(--tracking-wide);text-transform:uppercase}.library-manager-item{display:flex;justify-content:space-between;align-items:center;padding:var(--space-lg);background:var(--bg-elevated);border:2px solid var(--border-secondary);border-radius:var(--radius-lg);margin-bottom:var(--space-md);transition:all .2s}.library-manager-item:hover{background:var(--bg-hover);border-color:var(--grid-primary)}.item-info{display:flex;align-items:center;gap:var(--space-lg);flex:1}.item-color-box{width:2.5rem;height:2.5rem;border-radius:var(--radius-md);border:2px solid var(--border-secondary);flex-shrink:0}.item-details{flex:1}.item-name{font-weight:var(--font-medium);font-family:var(--font-body);color:var(--text-primary);margin-bottom:var(--space-xs)}.item-meta{font-size:var(--text-sm);color:var(--text-secondary);font-family:var(--font-body);margin-bottom:var(--space-xs)}.item-id{font-size:.7rem;color:var(--text-muted);font-family:var(--font-mono)}.item-actions{display:flex;gap:var(--space-sm);flex-shrink:0}.edit-button,.delete-button{padding:var(--space-sm) var(--space-lg);border:2px solid;border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.edit-button{background:var(--spacer-primary);border-color:var(--spacer-primary);color:var(--text-primary)}.edit-button:hover{background:var(--spacer-secondary);border-color:var(--spacer-secondary)}.delete-button{background:transparent;color:var(--invalid-primary);border-color:var(--invalid-primary)}.delete-button:hover{background:var(--invalid-alpha-40)}.library-manager-form{padding:var(--space-xl)}.library-manager-form h3{margin:0 0 var(--space-xl);font-size:var(--text-lg);font-family:var(--font-display);font-weight:var(--font-bold);letter-spacing:var(--tracking-wide);text-transform:uppercase;color:var(--text-primary)}.form-group{margin-bottom:var(--space-lg)}.form-group label{display:block;margin-bottom:var(--space-sm);font-size:var(--text-base);color:var(--text-secondary);font-weight:var(--font-medium);font-family:var(--font-body);text-transform:uppercase;letter-spacing:var(--tracking-wide)}.form-group small{display:block;margin-top:var(--space-xs);font-size:var(--text-sm);color:var(--text-muted);font-family:var(--font-body);line-height:1.3}.form-group input,.form-group select{width:100%;padding:var(--space-md);background:var(--bg-primary);border:2px solid var(--border-secondary);border-radius:var(--radius-lg);color:var(--text-primary);font-size:var(--text-base);font-family:var(--font-body);box-sizing:border-box}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--grid-primary);box-shadow:0 0 0 3px var(--grid-alpha-10)}.form-group input:disabled{opacity:.5;cursor:not-allowed}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-lg);margin-bottom:var(--space-lg)}.color-input-group{display:grid;grid-template-columns:auto 1fr;gap:var(--space-sm)}.color-input-group input[type=color]{width:3rem;height:3rem;padding:var(--space-xs);cursor:pointer;border-radius:var(--radius-md)}.color-input-group input[type=text]{font-family:var(--font-mono)}.category-checkbox-list{display:flex;flex-direction:column;gap:var(--space-sm);padding:var(--space-sm);background:var(--bg-elevated);border:2px solid var(--border-secondary);border-radius:var(--radius-lg)}.category-checkbox-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm);cursor:pointer;border-radius:var(--radius-md);transition:background .2s}.category-checkbox-item:hover{background:var(--bg-hover)}.category-checkbox-item input[type=checkbox]{width:auto;cursor:pointer;margin:0}.category-color-indicator{width:1rem;height:1rem;border-radius:2px;border:1px solid var(--border-primary)}.form-validation-error{margin-top:var(--space-sm);padding:var(--space-sm);background:var(--invalid-alpha-40);border:1px solid var(--invalid-primary);border-radius:var(--radius-md);color:var(--invalid-primary);font-size:var(--text-sm);font-family:var(--font-body)}.form-actions{display:flex;gap:var(--space-md);margin-top:var(--space-xl);padding-top:var(--space-xl);border-top:2px solid var(--border-primary)}.cancel-button,.submit-button{flex:1;padding:var(--space-md);border:2px solid;border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.cancel-button{background:transparent;color:var(--text-secondary);border-color:var(--border-secondary)}.cancel-button:hover{background:var(--bg-hover);border-color:var(--text-secondary)}.submit-button{background:var(--valid-primary);border-color:var(--valid-primary);color:var(--bg-primary)}.submit-button:hover{background:var(--valid-secondary);border-color:var(--valid-secondary)}.item-library-category{margin-bottom:1rem}.item-library-category:last-child{margin-bottom:0}.category-title{margin:0 0 var(--space-sm);font-size:var(--text-base);color:var(--text-secondary);font-family:var(--font-display);font-weight:var(--font-bold);letter-spacing:var(--tracking-wide);text-transform:uppercase;-webkit-user-select:none;user-select:none}.category-title.collapsible{cursor:pointer;display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-xs) 0;transition:color .2s}.category-title.collapsible:hover{color:var(--grid-primary)}.category-title.collapsible:focus{outline:2px solid var(--grid-primary);outline-offset:2px;border-radius:var(--radius-sm)}.category-chevron{display:inline-block;font-size:.625rem;transition:transform .2s ease}.category-chevron.collapsed{transform:rotate(0)}.category-chevron.expanded{transform:rotate(90deg)}.category-items{display:flex;flex-wrap:wrap;gap:var(--space-sm);overflow:hidden;transition:max-height .3s ease,opacity .2s ease,margin .2s ease}.category-items.expanded{max-height:1000px;opacity:1;margin-bottom:0}.category-items.collapsed{max-height:0;opacity:0;margin-bottom:0}.library-item-card{display:flex;flex-direction:column;align-items:center;padding:var(--space-sm);border:2px solid var(--border-primary);border-radius:var(--radius-lg);background:var(--bg-secondary);cursor:grab;transition:all .2s;min-width:60px}.library-item-card:hover{border-color:var(--grid-primary);background:var(--blue-50, #EFF6FF);box-shadow:var(--shadow-md);transform:translateY(-2px)}.library-item-card:active{cursor:grabbing;transform:translateY(0)}.library-item-preview{display:grid;grid-template-columns:repeat(3,12px);grid-template-rows:repeat(3,12px);gap:2px;margin-bottom:.25rem}.library-item-preview-cell{background:var(--bg-elevated);border-radius:var(--radius-sm);border:1px solid var(--border-secondary)}.library-item-preview-cell.active{background:var(--grid-alpha-30);border:1px solid var(--grid-primary)}.library-item-preview-container{width:40px;height:40px;display:flex;align-items:center;justify-content:center;margin-bottom:.25rem;position:relative}.library-item-image{width:40px;height:40px;object-fit:contain;border-radius:var(--radius-md);background:var(--bg-elevated);position:absolute;opacity:0;transition:opacity .2s}.library-item-image.visible{opacity:1}.library-item-image.hidden{opacity:0;pointer-events:none}.library-item-info{display:flex;flex-direction:column;align-items:center;font-size:var(--text-xs);font-family:var(--font-body)}.library-item-name{font-weight:var(--font-medium);white-space:nowrap;color:var(--text-primary);letter-spacing:var(--tracking-wide)}.library-item-size{color:var(--text-tertiary);font-family:var(--font-mono);font-variant-numeric:tabular-nums}.placed-item{position:absolute;border:2px solid;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;cursor:grab;transition:all .2s;z-index:1;box-sizing:border-box}.placed-item:active{cursor:grabbing}.placed-item.selected{box-shadow:0 0 0 3px #3b82f64d;border-color:var(--blue-500);z-index:2}.placed-item.invalid{animation:pulse-invalid 1s ease-in-out infinite}@keyframes pulse-invalid{0%,to{opacity:1}50%{opacity:.7}}.placed-item-label{font-size:var(--text-xs);font-weight:var(--font-semibold);font-family:var(--font-body);text-align:center;color:var(--text-primary);text-shadow:0 1px 2px rgba(0,0,0,.3);pointer-events:none;padding:var(--space-xs);word-break:break-word;letter-spacing:var(--tracking-wide)}.placed-item-delete-btn{position:absolute;top:-8px;right:-8px;width:18px;height:18px;border-radius:50%;border:1.5px solid var(--border-secondary);background:var(--bg-primary);color:var(--text-tertiary);font-size:12px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:3;padding:0;animation:delete-btn-appear .15s ease-out}.placed-item-delete-btn:hover{background:var(--invalid-primary);border-color:var(--invalid-primary);color:#fff;transform:scale(1.15)}.placed-item-delete-btn:active{transform:scale(.95)}@keyframes delete-btn-appear{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}.placed-item-rotate-btn{position:absolute;top:-8px;width:18px;height:18px;border-radius:50%;border:1.5px solid var(--border-secondary);background:var(--bg-primary);color:var(--text-tertiary);font-size:12px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:3;padding:0;animation:delete-btn-appear .15s ease-out}.placed-item-rotate-btn--ccw{left:-8px}.placed-item-rotate-btn--cw{left:16px}.placed-item-rotate-btn:hover{background:var(--valid-primary);border-color:var(--valid-primary);color:#fff;transform:scale(1.15)}.placed-item-rotate-btn:active{transform:scale(.95)}.placed-item-image-container{position:absolute;width:100%;height:100%;top:0;left:0;border-radius:var(--radius-md);overflow:hidden;z-index:0}.placed-item-image{width:100%;height:100%;object-fit:contain;background:#00000005;position:absolute;opacity:0;transition:opacity .2s}.placed-item-image.visible{opacity:1;z-index:1}.placed-item-image.hidden{opacity:0;pointer-events:none}.item-controls{display:flex;gap:.5rem}.item-control-btn{flex:1;padding:var(--space-sm) var(--space-md);border:2px solid var(--border-secondary);border-radius:var(--radius-lg);background:transparent;color:inherit;cursor:pointer;font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.item-control-btn:hover{border-color:var(--grid-primary);background:var(--grid-alpha-10)}.rotate-btn:hover{border-color:var(--valid-primary);background:var(--valid-alpha-40)}.delete-btn:hover{border-color:var(--invalid-primary);background:var(--invalid-alpha-40)}.bill-of-materials{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);padding:var(--space-lg);display:flex;flex-direction:column;height:fit-content;max-height:600px;box-shadow:var(--shadow-sm)}.bom-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:2px solid var(--border-primary)}.bom-title{margin:0;font-size:var(--text-lg);font-family:var(--font-display);font-weight:var(--font-bold);letter-spacing:var(--tracking-wide);text-transform:uppercase;color:var(--text-primary)}.bom-total{font-size:var(--text-base);color:var(--text-secondary);font-weight:var(--font-medium);font-family:var(--font-mono);font-variant-numeric:tabular-nums}.bom-content{display:flex;flex-direction:column;gap:var(--space-lg);overflow-y:auto;padding-right:var(--space-sm)}.bom-category{display:flex;flex-direction:column;gap:var(--space-sm)}.bom-category-title{margin:0;font-size:var(--text-base);color:var(--text-secondary);font-family:var(--font-display);font-weight:var(--font-bold);text-transform:uppercase;letter-spacing:var(--tracking-wide)}.bom-items{display:flex;flex-direction:column;gap:var(--space-sm)}.bom-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm);background:var(--bg-secondary);border:2px solid var(--border-secondary);border-radius:var(--radius-lg);transition:all .2s}.bom-item:hover{border-color:var(--grid-primary);background:var(--grid-alpha-10)}.bom-item-color{width:12px;height:12px;border-radius:var(--radius-sm);flex-shrink:0;border:1px solid var(--border-elevated)}.bom-item-details{flex:1;display:flex;flex-direction:column;gap:var(--space-xs)}.bom-item-name{font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);color:var(--text-primary)}.bom-item-size{font-size:var(--text-sm);color:var(--text-tertiary);font-family:var(--font-mono);font-variant-numeric:tabular-nums}.bom-item-quantity{font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--grid-primary);font-family:var(--font-mono);padding:var(--space-xs) var(--space-sm);background:var(--grid-alpha-10);border-radius:var(--radius-md);font-variant-numeric:tabular-nums}.bom-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-2xl) var(--space-lg);text-align:center;color:var(--text-secondary);font-family:var(--font-body)}.bom-empty p{margin:.25rem 0}.bom-hint{font-size:.75rem}.bom-submit{margin-top:var(--space-lg);padding-top:var(--space-lg);border-top:1px solid var(--border-primary)}.bom-submit-button{width:100%;padding:var(--space-md);background:var(--valid-primary);border:2px solid var(--valid-primary);color:var(--bg-primary);border-radius:var(--radius-lg);font-size:var(--text-sm);font-weight:var(--font-semibold);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.bom-submit-button:hover:not(:disabled){background:var(--valid-secondary);border-color:var(--valid-secondary)}.bom-submit-button:disabled{opacity:.6;cursor:not-allowed}.bom-submit-notice{margin:var(--space-sm) 0 0;font-size:var(--text-xs);color:var(--text-tertiary);text-align:center;font-family:var(--font-body)}.bom-submit-error{margin:var(--space-sm) 0 0;font-size:var(--text-xs);color:var(--invalid-primary);text-align:center;font-family:var(--font-body)}@media(max-width:1199px){.app-main{grid-template-columns:1fr;grid-template-rows:auto 1fr auto}.sidebar{order:1;width:100%}.preview{order:2;min-height:60vh}.bom-sidebar{order:3;width:100%}}@media(max-width:768px){.app{padding:var(--space-lg)}.app-header{flex-direction:column;gap:var(--space-sm);height:auto}.grid-controls{justify-content:center}.grid-summary{margin-left:0;width:100%;justify-content:center}.app-main{grid-template-columns:1fr}.preview{min-height:400px;padding:var(--space-lg)}.bom-sidebar{order:1}}.clear-all-button{padding:var(--space-sm) var(--space-lg);border:2px solid var(--invalid-primary);border-radius:var(--radius-lg);background:transparent;color:var(--invalid-primary);font-size:var(--text-sm);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.clear-all-button:hover{background:var(--invalid-alpha-40)}.reference-image-overlay{position:absolute;z-index:0;box-sizing:border-box;overflow:visible}.reference-image-overlay__content{transition:opacity .2s ease,transform .2s ease;box-sizing:border-box}.reference-image-overlay--interactive{cursor:grab}.reference-image-overlay--interactive .reference-image-overlay__content{border:2px dashed var(--grid-primary);border-radius:var(--radius-md)}.reference-image-overlay--dragging{cursor:grabbing}.reference-image-overlay--locked.reference-image-overlay--interactive{cursor:not-allowed}.reference-image-overlay--locked .reference-image-overlay__content{opacity:.7!important}.reference-image-overlay--selected .reference-image-overlay__content{border:2px solid var(--grid-primary);border-radius:var(--radius-md)}.reference-image-overlay__toolbar{position:absolute;top:0;left:0;z-index:10;display:flex;align-items:center;gap:6px;padding:4px 8px;background:#000000bf;border-radius:0 0 6px;white-space:nowrap;pointer-events:auto}.reference-image-overlay__toolbar-label{display:flex;align-items:center;gap:4px;font-size:11px;font-weight:500;color:#fff;cursor:default}.reference-image-overlay__toolbar-slider{width:60px;height:4px;border-radius:2px;background:#ffffff4d;cursor:pointer;-webkit-appearance:none;appearance:none}.reference-image-overlay__toolbar-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:12px;height:12px;border-radius:50%;background:#fff;cursor:pointer}.reference-image-overlay__toolbar-slider::-moz-range-thumb{width:12px;height:12px;border-radius:50%;background:#fff;border:none;cursor:pointer}.reference-image-overlay__toolbar-slider:focus{outline:none}.reference-image-overlay__toolbar-btn{padding:2px 6px;border:1px solid rgba(255,255,255,.4);border-radius:3px;font-size:11px;font-weight:500;cursor:pointer;transition:background .15s,color .15s;background:transparent;color:#fff}.reference-image-overlay__toolbar-btn:hover{background:#fff3}.reference-image-overlay__toolbar-btn--rotate{font-size:14px;line-height:1;padding:1px 5px}.reference-image-overlay__toolbar-btn--rotate:hover{background:#22c55e4d}.reference-image-overlay__toolbar-btn--remove{font-size:14px;line-height:1;padding:1px 5px;color:#ff6b6b;border-color:#ff6b6b66}.reference-image-overlay__toolbar-btn--remove:hover{background:#ff6b6b4d}.reference-image-uploader{display:flex;flex-direction:column;gap:var(--space-md)}.reference-image-uploader__button{padding:var(--space-md);background:var(--accent-primary);color:var(--bg-primary);border:2px solid var(--accent-primary);border-radius:var(--radius-lg);font-size:var(--text-base);font-weight:var(--font-medium);font-family:var(--font-body);cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:var(--tracking-wide)}.reference-image-uploader__button:hover:not(:disabled){background:var(--accent-secondary);border-color:var(--accent-secondary)}.reference-image-uploader__button:active:not(:disabled){background:var(--accent-primary);border-color:var(--accent-primary)}.reference-image-uploader__button:disabled{opacity:.6;cursor:not-allowed}.reference-image-uploader__error{padding:var(--space-md);background:var(--invalid-alpha-40);border:2px solid var(--invalid-primary);border-radius:var(--radius-lg);color:var(--invalid-primary);font-size:var(--text-sm);font-family:var(--font-body);font-weight:var(--font-medium);text-align:center}.library-selector{margin-bottom:16px;padding:12px;background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:8px}.library-selector-title{font-size:.875rem;font-weight:600;color:var(--text-secondary);margin-bottom:8px}.library-selector-list{display:flex;flex-direction:column;gap:8px}.library-selector-item{display:flex;align-items:center;gap:8px}.library-selector-item input[type=checkbox]:disabled{cursor:not-allowed;opacity:.5}.library-selector-label{cursor:pointer;font-size:.875rem;color:var(--text-primary)}.library-selector-count{font-size:.75rem;color:var(--text-tertiary);font-family:monospace}