:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-light: #dbeafe;--color-secondary: #64748b;--color-secondary-hover: #475569;--color-secondary-light: #f1f5f9;--color-success: #059669;--color-success-light: #d1fae5;--color-warning: #d97706;--color-warning-light: #fef3c7;--color-danger: #dc2626;--color-danger-light: #fef2f2;--color-white: #ffffff;--color-gray-50: #f8fafc;--color-gray-100: #f1f5f9;--color-gray-200: #e2e8f0;--color-gray-300: #cbd5e1;--color-gray-400: #94a3b8;--color-gray-500: #64748b;--color-gray-600: #475569;--color-gray-700: #334155;--color-gray-800: #1e293b;--color-gray-900: #0f172a;--font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Monaco, "Cascadia Code", "Liberation Mono", Consolas, monospace;--spacing-1: .25rem;--spacing-2: .5rem;--spacing-3: .75rem;--spacing-4: 1rem;--spacing-5: 1.25rem;--spacing-6: 1.5rem;--spacing-8: 2rem;--spacing-10: 2.5rem;--spacing-12: 3rem;--radius-sm: .125rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-2xl: 1rem;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family-sans);background:var(--color-gray-50);color:var(--color-gray-900);line-height:1.6;min-height:100vh;padding:var(--spacing-5)}.container{max-width:1400px;margin:0 auto;background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:var(--shadow-xl);overflow:hidden;border:1px solid var(--color-gray-200)}.header{background:linear-gradient(135deg,var(--color-gray-900) 0%,var(--color-gray-800) 100%);color:var(--color-white);padding:var(--spacing-10);text-align:center;border-bottom:3px solid var(--color-primary)}.header h1{font-size:2.5rem;font-weight:700;margin-bottom:var(--spacing-2);letter-spacing:-.025em}.header p{font-size:1.125rem;color:var(--color-gray-300);font-weight:400}.main-content{display:grid;grid-template-columns:380px 1fr;gap:0;min-height:1200px}.controls{background:var(--color-gray-50);padding:var(--spacing-6);border-right:1px solid var(--color-gray-200);overflow-y:auto;max-height:1200px}.canvas-container{padding:var(--spacing-6);display:flex;flex-direction:column;align-items:center;background:var(--color-white)}canvas{border:2px solid var(--color-gray-300);border-radius:var(--radius-lg);cursor:crosshair;background:var(--color-gray-50);box-shadow:var(--shadow-md);max-width:100%;height:auto;transition:border-color .2s ease}canvas:hover{border-color:var(--color-primary)}.control-section{background:var(--color-white);border-radius:var(--radius-lg);padding:var(--spacing-5);margin-bottom:var(--spacing-4);box-shadow:var(--shadow-sm);border:1px solid var(--color-gray-200)}.control-section h3{color:var(--color-gray-900);margin-bottom:var(--spacing-4);padding-bottom:var(--spacing-3);border-bottom:2px solid var(--color-primary);font-weight:600;font-size:1.125rem}.input-group{margin-bottom:var(--spacing-3)}.input-group label{display:block;margin-bottom:var(--spacing-2);color:var(--color-gray-700);font-weight:500;font-size:.875rem}.input-group input,.input-group select{width:100%;padding:var(--spacing-3) var(--spacing-4);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);font-size:14px;transition:all .2s ease;background:var(--color-white)}.input-group input:focus,.input-group select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.input-group small{display:block;margin-top:var(--spacing-1);color:var(--color-gray-500);font-size:.75rem}.btn{padding:var(--spacing-3) var(--spacing-5);border:none;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all .2s ease;font-size:14px;margin:var(--spacing-1);display:inline-flex;align-items:center;justify-content:center;text-decoration:none}.btn-primary{background:var(--color-primary);color:var(--color-white);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--color-primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-secondary);color:var(--color-white);box-shadow:var(--shadow-sm)}.btn-secondary:hover{background:var(--color-secondary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-success{background:var(--color-success);color:var(--color-white);box-shadow:var(--shadow-sm)}.btn-success:hover{background:#047857;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-danger{background:var(--color-danger);color:var(--color-white);box-shadow:var(--shadow-sm)}.btn-danger:hover{background:#b91c1c;transform:translateY(-1px);box-shadow:var(--shadow-md)}.status{padding:var(--spacing-4);margin:var(--spacing-3) 0;border-radius:var(--radius-md);font-size:14px;text-align:center;font-weight:500;border:1px solid}.status.info{background:var(--color-primary-light);color:var(--color-primary);border-color:var(--color-primary)}.status.success{background:var(--color-success-light);color:var(--color-success);border-color:var(--color-success)}.status.warning{background:var(--color-warning-light);color:var(--color-warning);border-color:var(--color-warning)}.status.error{background:var(--color-danger-light);color:var(--color-danger);border-color:var(--color-danger)}.materials-list{background:var(--color-white);border-radius:var(--radius-lg);padding:var(--spacing-5);margin-top:var(--spacing-6);max-height:400px;overflow-y:auto;border:1px solid var(--color-gray-200);box-shadow:var(--shadow-sm)}.materials-list h3{color:var(--color-gray-900);margin-bottom:var(--spacing-4);padding-bottom:var(--spacing-3);border-bottom:2px solid var(--color-success);font-weight:600;font-size:1.25rem}.material-item{padding:var(--spacing-4);margin:var(--spacing-3) 0;background:var(--color-gray-50);border-radius:var(--radius-md);border-left:4px solid var(--color-success);border:1px solid var(--color-gray-200)}.material-item strong{color:var(--color-gray-900);display:block;margin-bottom:var(--spacing-2);font-weight:600}.instructions{background:var(--color-primary-light);border:1px solid var(--color-primary);border-radius:var(--radius-lg);padding:var(--spacing-5);margin-bottom:var(--spacing-4)}.instructions h4{color:var(--color-primary);margin-bottom:var(--spacing-3);font-weight:600}.instructions ol{margin-left:var(--spacing-5);color:var(--color-gray-700)}.instructions li{margin-bottom:var(--spacing-2)}.checkbox-group{display:flex;align-items:center;margin:var(--spacing-3) 0}.checkbox-group input[type=checkbox]{margin-right:var(--spacing-2);width:18px;height:18px;cursor:pointer;accent-color:var(--color-primary)}.checkbox-group label{cursor:pointer;color:var(--color-gray-700);font-weight:500}.grid-info{background:var(--color-secondary-light);padding:var(--spacing-3);border-radius:var(--radius-md);margin-bottom:var(--spacing-3);font-size:.875rem;color:var(--color-gray-700);border:1px solid var(--color-gray-300)}.legend{display:flex;flex-wrap:wrap;gap:var(--spacing-4);margin-top:var(--spacing-4);padding:var(--spacing-4);background:var(--color-gray-100);border-radius:var(--radius-md);border:1px solid var(--color-gray-200)}.legend-item{display:flex;align-items:center;gap:var(--spacing-2);font-size:.875rem;color:var(--color-gray-700)}.legend-color{width:20px;height:20px;border:1px solid var(--color-gray-400);border-radius:var(--radius-sm)}@media(max-width:768px){body{padding:var(--spacing-3)}.main-content{grid-template-columns:1fr}.controls{border-right:none;border-bottom:1px solid var(--color-gray-200);max-height:none}.header h1{font-size:2rem}.header{padding:var(--spacing-6)}canvas{max-width:100%;height:auto}}@media(max-width:480px){.header h1{font-size:1.75rem}.control-section,.controls,.canvas-container{padding:var(--spacing-4)}}.btn:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}.btn:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media(prefers-contrast:high){:root{--color-gray-100: #f9f9f9;--color-gray-200: #e0e0e0;--color-gray-300: #c0c0c0}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}