:root{--primary-color: #3b82f6;--secondary-color: #6b7280;--success-color: #10b981;--danger-color: #ef4444;--bg-color: #f9fafb;--card-bg: #ffffff;--text-primary: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb;--shadow: 0 1px 3px 0 rgb(0 0 0 / .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg-color);color:var(--text-primary);line-height:1.6}.container{max-width:800px;margin:0 auto;padding:2rem}.hidden{display:none!important}.empty-state{text-align:center;padding:4rem 2rem}.empty-state .icon{width:80px;height:80px;margin:0 auto 1.5rem;color:var(--secondary-color)}.empty-state h2{font-size:1.5rem;margin-bottom:.5rem;color:var(--text-primary)}.empty-state p{color:var(--text-secondary);margin-bottom:2rem}.help-text{background:var(--card-bg);border-radius:8px;padding:1.5rem;box-shadow:var(--shadow);text-align:left;max-width:400px;margin:0 auto}.help-text p{font-weight:600;margin-bottom:.5rem}.help-text ul{list-style:none;padding-left:0}.help-text li{padding:.25rem 0;color:var(--text-secondary)}.help-text li:before{content:"✓ ";color:var(--success-color);font-weight:700;margin-right:.5rem}.header{background:var(--card-bg);border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow)}.header h1{font-size:1.5rem;margin-bottom:1rem}.video-info{display:grid;gap:.75rem}.info-item{display:flex;align-items:center;gap:.5rem}.label{font-weight:600;color:var(--text-secondary);min-width:80px}.filename{flex:1;font-family:monospace;color:var(--text-primary)}.filename-input{flex:1;padding:.25rem .5rem;border:1px solid var(--border-color);border-radius:4px;font-family:monospace}.progress-section{background:var(--card-bg);border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow)}.progress-bar{height:8px;background:var(--border-color);border-radius:4px;overflow:hidden;margin-bottom:.75rem}.progress-fill{height:100%;background:var(--primary-color);transition:width .3s ease;width:0%}.progress-info{display:flex;justify-content:space-between;margin-bottom:.5rem;font-size:.875rem}.progress-details{display:flex;justify-content:space-between;font-size:.875rem;color:var(--text-secondary)}.controls{display:flex;gap:.75rem;margin-bottom:1.5rem;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:6px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s}.btn svg{width:18px;height:18px}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:#2563eb}.btn-secondary{background:var(--secondary-color);color:#fff}.btn-secondary:hover{background:#4b5563}.btn-success{background:var(--success-color);color:#fff}.btn-success:hover{background:#059669}.btn-danger{background:var(--danger-color);color:#fff}.btn-danger:hover{background:#dc2626}.btn-icon{padding:.5rem;background:transparent;border:none;cursor:pointer;color:var(--text-secondary);transition:color .2s}.btn-icon:hover{color:var(--primary-color)}.btn-icon svg{width:18px;height:18px;stroke-width:2}.settings-section{background:var(--card-bg);border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow)}.settings-section h3{font-size:1rem;margin-bottom:1rem}.settings-grid{display:grid;gap:1rem}.settings-grid label{display:flex;align-items:center;gap:.5rem}.settings-grid input[type=checkbox]{width:18px;height:18px;cursor:pointer}.settings-grid input[type=number]{width:80px;padding:.25rem .5rem;border:1px solid var(--border-color);border-radius:4px}.error-section{background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:1.5rem;margin-bottom:1.5rem}.error-section h3{color:var(--danger-color);font-size:1rem;margin-bottom:1rem}.error-list{max-height:200px;overflow-y:auto;margin-bottom:1rem}.error-item{padding:.5rem;background:#fff;border-radius:4px;margin-bottom:.5rem;font-size:.875rem}.error-controls{display:flex;gap:.75rem}@media (max-width: 640px){.container{padding:1rem}.controls{flex-direction:column}.btn{width:100%;justify-content:center}}