:root{--primary-color: #2563eb;--primary-dark: #1d4ed8;--primary-light: #3b82f6;--bg-dark: #0f172a;--bg-medium: #1e293b;--bg-light: #334155;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--border-color: #475569;--success: #22c55e;--error: #ef4444;--warning: #f59e0b;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(0,0,0,.3);--shadow-md: 0 4px 12px rgba(0,0,0,.4);--shadow-lg: 0 12px 40px rgba(0,0,0,.5);--transition: .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-dark);color:var(--text-primary);line-height:1.6;min-height:100vh}.app-header{background:linear-gradient(135deg,var(--bg-medium) 0%,var(--bg-dark) 100%);border-bottom:1px solid var(--border-color);padding:1rem 2rem;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-content{max-width:1400px;margin:0 auto;display:flex;align-items:center;gap:1rem}.company-name{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,var(--primary-light),var(--text-primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-tagline{color:var(--text-secondary);font-size:.9rem;padding-left:1rem;border-left:1px solid var(--border-color)}.app-main{max-width:1400px;margin:0 auto;padding:2rem}.hero-section{text-align:center;padding:2rem 0 3rem}.hero-section h2{font-size:2.5rem;font-weight:700;margin-bottom:.75rem;background:linear-gradient(135deg,var(--text-primary) 0%,var(--primary-light) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-section p{font-size:1.1rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.visualizer-container{display:grid;grid-template-columns:380px 1fr;gap:2rem;min-height:600px}@media(max-width:1024px){.visualizer-container{grid-template-columns:1fr}}.visualizer-sidebar{display:flex;flex-direction:column;gap:1.5rem}.visualizer-main{background:var(--bg-medium);border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:1.5rem;min-height:500px}.image-uploader{background:var(--bg-medium);border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:1.5rem}.uploader-title{font-size:1.1rem;font-weight:600;margin-bottom:1rem}.upload-zone{border:2px dashed var(--border-color);border-radius:var(--radius-md);padding:2rem;text-align:center;cursor:pointer;transition:var(--transition)}.upload-zone:hover,.upload-zone.dragging{border-color:var(--primary-color);background:#2563eb1a}.upload-zone.disabled{opacity:.5;pointer-events:none}.file-input{display:none}.upload-label{cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:.75rem}.upload-icon{color:var(--text-secondary)}.upload-text{color:var(--text-secondary);font-size:.95rem}.upload-text strong{color:var(--primary-light)}.upload-hint{font-size:.8rem;color:var(--text-muted)}.preview-container{position:relative}.preview-image{width:100%;border-radius:var(--radius-md);max-height:200px;object-fit:cover}.change-image-btn{position:absolute;bottom:.5rem;right:.5rem;background:#000000b3;color:var(--text-primary);border:none;padding:.5rem 1rem;border-radius:var(--radius-sm);cursor:pointer;font-size:.85rem;transition:var(--transition)}.change-image-btn:hover{background:#000000e6}.upload-error{color:var(--error);font-size:.85rem;margin-top:.75rem}.upload-tips{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border-color)}.upload-tips h4{font-size:.85rem;color:var(--text-secondary);margin-bottom:.5rem}.upload-tips ul{list-style:none;font-size:.8rem;color:var(--text-muted)}.upload-tips li{padding:.2rem 0 .2rem 1rem;position:relative}.upload-tips li:before{content:"•";position:absolute;left:0;color:var(--primary-color)}.shingle-selector{background:var(--bg-medium);border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:1.5rem}.selector-title{font-size:1.1rem;font-weight:600;margin-bottom:.25rem}.selector-subtitle{font-size:.85rem;color:var(--text-muted);margin-bottom:1rem}.shingle-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;max-height:280px;overflow-y:auto;padding-right:.5rem}.shingle-grid::-webkit-scrollbar{width:6px}.shingle-grid::-webkit-scrollbar-track{background:var(--bg-dark);border-radius:3px}.shingle-grid::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.shingle-option{background:var(--bg-light);border:2px solid transparent;border-radius:var(--radius-md);padding:.5rem;cursor:pointer;transition:var(--transition);text-align:center}.shingle-option:hover{border-color:var(--border-color);transform:translateY(-2px)}.shingle-option.selected{border-color:var(--primary-color);background:#2563eb26}.shingle-option:disabled{opacity:.5;cursor:not-allowed;transform:none}.shingle-swatch{width:100%;aspect-ratio:1.5;border-radius:var(--radius-sm);margin-bottom:.4rem;box-shadow:inset 0 2px 4px #0000004d;overflow:hidden}.swatch-image{width:100%;height:100%;object-fit:cover;display:block}.shingle-info{display:flex;flex-direction:column}.shingle-name{font-size:.75rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.shingle-brand{font-size:.65rem;color:var(--text-muted)}.selected-details{display:flex;gap:1rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border-color)}.detail-swatch{width:60px;height:60px;border-radius:var(--radius-md);flex-shrink:0;box-shadow:var(--shadow-md)}.detail-text h4{font-size:.9rem;font-weight:600;margin-bottom:.25rem}.detail-text p{font-size:.8rem;color:var(--text-secondary)}.result-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;min-height:400px;text-align:center;color:var(--text-muted)}.placeholder-icon{margin-bottom:1rem;opacity:.5}.result-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;min-height:400px}.loading-spinner{width:48px;height:48px;border:3px solid var(--bg-light);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{margin-top:1.5rem;font-weight:500}.loading-subtext{color:var(--text-muted);font-size:.85rem;margin-top:.25rem}.result-error{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;min-height:400px;text-align:center}.error-icon{font-size:2.5rem;margin-bottom:1rem}.error-text{color:var(--error);font-weight:500}.error-hint{color:var(--text-muted);font-size:.85rem;margin-top:.25rem}.result-display{height:100%;display:flex;flex-direction:column}.result-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.result-header h3{font-size:1.1rem;font-weight:600}.view-toggle{display:flex;background:var(--bg-dark);border-radius:var(--radius-sm);padding:3px}.view-toggle button{background:transparent;border:none;color:var(--text-muted);padding:.4rem .75rem;font-size:.8rem;cursor:pointer;border-radius:var(--radius-sm);transition:var(--transition)}.view-toggle button:hover{color:var(--text-primary)}.view-toggle button.active{background:var(--primary-color);color:var(--text-primary)}.comparison-side-by-side{display:grid;grid-template-columns:1fr 1fr;gap:1rem;flex:1}.comparison-panel{position:relative;border-radius:var(--radius-md);overflow:hidden}.comparison-panel img{width:100%;height:100%;object-fit:cover}.panel-label{position:absolute;top:.75rem;left:.75rem;background:#000000b3;color:var(--text-primary);padding:.35rem .75rem;border-radius:var(--radius-sm);font-size:.8rem;font-weight:500}.comparison-slider{flex:1;display:flex;flex-direction:column}.slider-container{position:relative;flex:1;border-radius:var(--radius-md);overflow:hidden}.slider-after,.slider-before{width:100%;height:100%;object-fit:cover}.slider-after{position:absolute;top:0;left:0}.slider-before-container{position:absolute;top:0;left:0;height:100%;overflow:hidden}.slider-before{position:absolute;top:0;left:0;width:auto;min-width:100%}.slider-input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:ew-resize;z-index:10}.slider-handle{position:absolute;top:0;height:100%;width:4px;background:var(--text-primary);transform:translate(-50%);pointer-events:none;display:flex;align-items:center;justify-content:center}.slider-handle span{background:var(--text-primary);color:var(--bg-dark);padding:.5rem;border-radius:var(--radius-sm);font-size:.75rem;white-space:nowrap}.slider-labels{display:flex;justify-content:space-between;margin-top:.75rem;font-size:.85rem;color:var(--text-secondary)}.comparison-toggle{flex:1;display:flex;flex-direction:column;align-items:center;position:relative}.comparison-toggle img{width:100%;height:auto;border-radius:var(--radius-md);flex:1;object-fit:cover}.toggle-btn{margin-top:1rem;background:var(--bg-light);border:1px solid var(--border-color);color:var(--text-primary);padding:.75rem 1.5rem;border-radius:var(--radius-md);cursor:pointer;font-weight:500;transition:var(--transition)}.toggle-btn:hover{background:var(--border-color)}.toggle-label{margin-top:.5rem;font-size:.9rem;color:var(--text-secondary)}.result-actions{display:flex;justify-content:center;gap:1rem;margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--border-color)}.download-btn{display:flex;align-items:center;gap:.5rem;background:var(--primary-color);color:var(--text-primary);text-decoration:none;padding:.75rem 1.5rem;border-radius:var(--radius-md);font-weight:500;transition:var(--transition)}.download-btn:hover{background:var(--primary-dark)}.cta-section{text-align:center;padding:3rem 2rem;margin-top:3rem;background:linear-gradient(135deg,var(--bg-medium) 0%,var(--bg-light) 100%);border-radius:var(--radius-lg);border:1px solid var(--border-color)}.cta-section h3{font-size:1.5rem;margin-bottom:.5rem}.cta-section p{color:var(--text-secondary);margin-bottom:1.5rem}.cta-button{display:inline-block;background:var(--primary-color);color:var(--text-primary);text-decoration:none;padding:1rem 2rem;border-radius:var(--radius-md);font-weight:600;font-size:1.1rem;transition:var(--transition);box-shadow:var(--shadow-md)}.cta-button:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.app-footer{text-align:center;padding:2rem;margin-top:2rem;border-top:1px solid var(--border-color);color:var(--text-muted);font-size:.85rem}.app-footer strong{color:var(--primary-light)}.disclaimer{margin-top:.5rem;font-size:.75rem;max-width:600px;margin-left:auto;margin-right:auto}@media(max-width:768px){.app-main{padding:1rem}.hero-section h2{font-size:1.75rem}.shingle-grid{grid-template-columns:repeat(4,1fr)}.comparison-side-by-side{grid-template-columns:1fr}.view-toggle{display:none}}