:root{--primary-color: #3b82f6;--primary-hover: #2563eb;--secondary-color: #6b7280;--background: #0f172a;--surface: #1e293b;--surface-light: #334155;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--border: #475569;--success: #10b981;--radius: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--background);color:var(--text-primary);line-height:1.6;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem}#app{width:100%;max-width:800px}.container{background:var(--surface);border-radius:var(--radius);padding:3rem;box-shadow:0 20px 25px -5px #0000004d}h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;background:linear-gradient(135deg,var(--primary-color),#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-secondary);margin-bottom:2rem;font-size:1.1rem}.help-section{background:var(--background);border-radius:var(--radius);padding:1.5rem;margin-bottom:2rem;border:1px solid var(--border)}.help-section h2{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:1rem}.help-list{margin:0 0 1rem 1.5rem;color:var(--text-secondary);line-height:1.8}.help-list li{margin-bottom:.5rem}.help-note{font-size:.875rem;color:var(--text-secondary);font-style:italic;margin:0;opacity:.8}.upload-section{margin-bottom:2rem}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:4rem 2rem;text-align:center;cursor:pointer;transition:all .3s ease;background:var(--background)}.drop-zone:hover{border-color:var(--primary-color);background:#3b82f60d}.drop-zone.drag-over{border-color:var(--primary-color);background:#3b82f61a;transform:scale(1.02)}.upload-icon{width:64px;height:64px;margin:0 auto 1rem;color:var(--text-secondary);transition:color .3s ease}.drop-zone:hover .upload-icon{color:var(--primary-color)}.drop-text{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.drop-subtext{color:var(--text-secondary);font-size:.95rem}.stats{margin-top:1.5rem;display:flex;justify-content:center;gap:2rem}.stat-item{display:flex;flex-direction:column;align-items:center;padding:1rem 2rem;background:var(--surface-light);border-radius:var(--radius);min-width:150px}.stat-value{font-size:2.5rem;font-weight:700;color:var(--primary-color);line-height:1;margin-bottom:.5rem}.stat-label{font-size:.875rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.action-section{display:flex;gap:1rem;justify-content:center;margin-bottom:2rem}.btn{padding:.875rem 2rem;font-size:1rem;font-weight:600;border:none;border-radius:var(--radius);cursor:pointer;transition:all .3s ease;text-transform:uppercase;letter-spacing:.05em}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 10px 15px -3px #3b82f64d}.btn-secondary{background:var(--surface-light);color:var(--text-primary)}.btn-secondary:hover{background:var(--border)}.progress-section{margin-top:2rem}.progress-bar{width:100%;height:8px;background:var(--surface-light);border-radius:9999px;overflow:hidden;margin-bottom:1rem}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color),#8b5cf6);border-radius:9999px;transition:width .3s ease;width:0%}.progress-text{text-align:center;color:var(--text-secondary);font-size:.95rem}@media (max-width: 640px){.container{padding:2rem}h1{font-size:2rem}.drop-zone{padding:3rem 1.5rem}.action-section{flex-direction:column}.btn{width:100%}}