:root{--primary-color: #6366f1;--primary-hover: #5855eb;--secondary-color: #f8fafc;--accent-color: #10b981;--danger-color: #ef4444;--warning-color: #f59e0b;--text-primary: #1f2937;--text-secondary: #6b7280;--text-muted: #9ca3af;--border-color: #e5e7eb;--border-hover: #d1d5db;--background: #ffffff;--background-secondary: #f9fafb;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--border-radius: 12px;--border-radius-lg: 16px;--transition: all .2s ease-in-out}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-color);padding:2rem 0;text-align:center}.header-content{max-width:1200px;margin:0 auto;padding:0 1rem}.logo{display:flex;align-items:center;justify-content:center;gap:.75rem;margin-bottom:.5rem}.logo svg{color:var(--primary-color)}.logo h1{font-size:2rem;font-weight:700;color:var(--text-primary)}.subtitle{color:var(--text-secondary);font-size:1.125rem}.main-content{flex:1;padding:2rem 1rem;max-width:1200px;margin:0 auto;width:100%}.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;height:100%;min-height:600px}.upload-panel,.result-panel{background:var(--background);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-xl);padding:2rem;display:flex;flex-direction:column}.panel-header{margin-bottom:2rem;text-align:center}.panel-header h2{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.panel-header p{color:var(--text-secondary)}.upload-area{flex:1;border:2px dashed var(--border-color);border-radius:var(--border-radius);padding:2rem;text-align:center;cursor:pointer;transition:var(--transition);position:relative;min-height:300px;display:flex;align-items:center;justify-content:center}.upload-area:hover{border-color:var(--primary-color);background-color:#6366f105}.upload-area.drag-over{border-color:var(--primary-color);background-color:#6366f10d;transform:scale(1.02)}.upload-area.has-file{border-style:solid;border-color:var(--accent-color);background-color:#10b98105}.file-input{position:absolute;opacity:0;pointer-events:none}.upload-placeholder{display:flex;flex-direction:column;align-items:center;gap:1rem}.upload-placeholder svg{color:var(--text-muted)}.upload-placeholder h3{font-size:1.25rem;font-weight:600;color:var(--text-primary)}.upload-placeholder p{color:var(--text-secondary)}.file-types{font-size:.875rem;color:var(--text-muted);background:var(--background-secondary);padding:.5rem 1rem;border-radius:20px}.file-preview{position:relative;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;gap:1rem}.preview-image{max-width:100%;max-height:200px;object-fit:contain;border-radius:var(--border-radius);box-shadow:var(--shadow-md)}.file-info{text-align:center}.file-info h4{font-weight:600;color:var(--text-primary);margin-bottom:.25rem}.file-info p{color:var(--text-secondary);font-size:.875rem}.remove-file{position:absolute;top:-.5rem;right:-.5rem;background:var(--danger-color);color:#fff;border:none;border-radius:50%;width:2rem;height:2rem;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);box-shadow:var(--shadow-md)}.remove-file:hover{background:#dc2626;transform:scale(1.1)}.error-message{background:#ef44441a;border:1px solid rgba(239,68,68,.2);color:var(--danger-color);padding:1rem;border-radius:var(--border-radius);margin-top:1rem;text-align:center}.action-buttons{display:flex;flex-direction:column;gap:1rem;margin-top:2rem}.process-button,.reset-button,.download-button{display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:var(--border-radius);font-weight:600;cursor:pointer;transition:var(--transition);font-size:1rem}.process-button{background:var(--primary-color);color:#fff}.process-button:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.process-button:disabled{opacity:.7;cursor:not-allowed;transform:none}.reset-button{background:var(--background-secondary);color:var(--text-secondary);border:1px solid var(--border-color)}.reset-button:hover{background:var(--border-color);color:var(--text-primary)}.download-button{background:var(--accent-color);color:#fff}.download-button:hover{background:#059669;transform:translateY(-2px);box-shadow:var(--shadow-lg)}.result-area{flex:1;display:flex;align-items:center;justify-content:center;min-height:300px}.result-placeholder{text-align:center;color:var(--text-muted)}.result-placeholder svg{margin-bottom:1rem}.result-placeholder h3{font-size:1.25rem;font-weight:600;margin-bottom:.5rem;color:var(--text-secondary)}.processing-state{text-align:center;color:var(--primary-color)}.processing-state h3{margin:1rem 0 .5rem;font-weight:600}.result-image-container{width:100%;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.result-image{max-width:100%;max-height:400px;object-fit:contain;border-radius:var(--border-radius);box-shadow:var(--shadow-lg);background:linear-gradient(45deg,#f0f0f0 25%,transparent 25%),linear-gradient(-45deg,#f0f0f0 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#f0f0f0 75%),linear-gradient(-45deg,transparent 75%,#f0f0f0 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px}.result-actions{display:flex;gap:1rem}.spinner{animation:spin 1s linear infinite}.spinner.large{margin-bottom:1rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (max-width: 768px){.content-grid{grid-template-columns:1fr;gap:1.5rem}.main-content{padding:1rem}.upload-panel,.result-panel{padding:1.5rem}.logo h1{font-size:1.5rem}.subtitle{font-size:1rem}.upload-area{min-height:250px;padding:1.5rem}.action-buttons{margin-top:1.5rem}}@media (max-width: 480px){.app-header{padding:1.5rem 0}.upload-area{min-height:200px;padding:1rem}.upload-placeholder h3{font-size:1.125rem}.upload-placeholder p{font-size:.875rem}.process-button,.reset-button,.download-button{padding:.625rem 1.25rem;font-size:.875rem}}.upload-area:focus-within{outline:2px solid var(--primary-color);outline-offset:2px}button:focus{outline:2px solid var(--primary-color);outline-offset:2px}*{transition:var(--transition)}.process-button:disabled .spinner{margin-right:.5rem}