*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4a90d9;--primary-hover: #3a7bc8;--match-color: #fff3cd;--match-border: #ffc107;--active-color: #ffb74d;--active-border: #ff9800;--text-primary: #333;--text-secondary: #666;--bg-primary: #ffffff;--bg-secondary: #f5f7fa;--border-color: #e0e0e0;--shadow: 0 2px 8px rgba(0, 0, 0, .1);--radius: 8px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--bg-secondary);color:var(--text-primary);line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.error-banner{background-color:#f8d7da;color:#721c24;padding:12px 20px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #f5c6cb}.error-banner button{background:none;border:none;color:#721c24;cursor:pointer;font-weight:500;padding:4px 8px}.error-banner button:hover{text-decoration:underline}.file-selector{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;max-width:900px;margin:0 auto;width:100%}.file-selector-title{font-size:2.5rem;font-weight:700;color:var(--primary-color);margin-bottom:8px}.file-selector-subtitle{font-size:1.1rem;color:var(--text-secondary);margin-bottom:40px}.file-selector-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;width:100%;margin-bottom:32px}@media(max-width:640px){.file-selector-grid{grid-template-columns:1fr}}.file-selector-hint{color:var(--text-secondary);font-size:.9rem;margin-top:16px}.drop-zone{border:2px dashed var(--border-color);border-radius:var(--radius);padding:40px 24px;text-align:center;cursor:pointer;transition:all .2s ease;background-color:var(--bg-primary)}.drop-zone:hover:not(.disabled){border-color:var(--primary-color);background-color:#4a90d90d}.drop-zone.drag-over{border-color:var(--primary-color);background-color:#4a90d91a;transform:scale(1.02)}.drop-zone.has-file{border-color:#28a745;border-style:solid;background-color:#28a7450d}.drop-zone.disabled{opacity:.6;cursor:not-allowed}.drop-zone-content{display:flex;flex-direction:column;align-items:center;gap:12px}.drop-zone-icon{width:48px;height:48px;color:var(--text-secondary)}.drop-zone.has-file .drop-zone-icon{color:#28a745}.drop-zone-label{font-size:1.1rem;font-weight:600;color:var(--text-primary)}.drop-zone-description{font-size:.9rem;color:var(--text-secondary)}.drop-zone-hint{color:var(--primary-color);font-weight:500}.drop-zone-filename{font-size:.9rem;color:#28a745;font-weight:500;word-break:break-all}.compare-button{background-color:var(--primary-color);color:#fff;border:none;padding:14px 48px;font-size:1.1rem;font-weight:600;border-radius:var(--radius);cursor:pointer;transition:all .2s ease}.compare-button:hover:not(:disabled){background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow)}.compare-button:disabled{background-color:#ccc;cursor:not-allowed}.comparison-view{display:flex;flex-direction:column;height:100vh}.comparison-header{display:flex;align-items:center;gap:24px;padding:16px 24px;background-color:var(--bg-primary);border-bottom:1px solid var(--border-color);flex-shrink:0}.back-button{display:flex;align-items:center;gap:8px;background:none;border:1px solid var(--border-color);padding:8px 16px;border-radius:var(--radius);cursor:pointer;font-size:.95rem;color:var(--text-primary);transition:all .2s ease}.back-button:hover{background-color:var(--bg-secondary);border-color:var(--text-secondary)}.back-button svg{width:18px;height:18px}.comparison-stats{display:flex;gap:32px;flex:1;justify-content:center}.stat-item{display:flex;flex-direction:column;align-items:center}.stat-value{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.stat-label{font-size:.85rem;color:var(--text-secondary)}.clear-button{background-color:var(--bg-secondary);border:1px solid var(--border-color);padding:8px 16px;border-radius:var(--radius);cursor:pointer;font-size:.9rem;color:var(--text-secondary);transition:all .2s ease}.clear-button:hover{background-color:#e0e0e0}.comparison-panels{display:grid;grid-template-columns:1fr auto 1fr;flex:1;overflow:hidden}.panel-divider{width:1px;background-color:var(--border-color)}.document-panel{display:flex;flex-direction:column;overflow:hidden;background-color:var(--bg-primary)}.document-panel-header{padding:12px 20px;border-bottom:1px solid var(--border-color);background-color:var(--bg-secondary);display:flex;justify-content:space-between;align-items:center;flex-shrink:0}.document-panel-header h2{font-size:1rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.document-panel-stats{font-size:.85rem;color:var(--text-secondary);white-space:nowrap}.document-panel-content{flex:1;overflow-y:auto;padding:20px;scroll-behavior:smooth}.document-panel-content.empty{display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}.paragraph{margin-bottom:16px;line-height:1.8}.sentence{transition:background-color .2s ease,box-shadow .2s ease;border-radius:2px;padding:1px 0}.sentence.matched{background-color:var(--match-color);border-bottom:2px solid var(--match-border)}.sentence.matched.clickable{cursor:pointer}.sentence.matched.clickable:hover{background-color:#ffe69c}.sentence.active{background-color:var(--active-color);border-bottom:2px solid var(--active-border);box-shadow:0 0 0 2px var(--active-border)}.comparison-legend{display:flex;justify-content:center;gap:32px;padding:12px 24px;background-color:var(--bg-secondary);border-top:1px solid var(--border-color);flex-shrink:0}.legend-item{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-secondary)}.legend-color{width:24px;height:16px;border-radius:2px}.legend-color.matched{background-color:var(--match-color);border:1px solid var(--match-border)}.legend-color.active{background-color:var(--active-color);border:1px solid var(--active-border)}.loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#fffffff2;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:1000}.loading-content{display:flex;flex-direction:column;align-items:center;max-width:500px;width:90%;padding:20px}.loading-spinner{width:48px;height:48px;border:4px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:16px}@keyframes spin{to{transform:rotate(360deg)}}.loading-title{color:var(--text-primary);font-size:1.2rem;font-weight:600;margin-bottom:24px}.progress-container{width:100%;display:flex;flex-direction:column;gap:20px}.progress-item{display:flex;flex-direction:column;gap:8px}.progress-header{display:flex;justify-content:space-between;align-items:center;gap:12px}.progress-label{font-size:.9rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:50%}.progress-stage{font-size:.8rem;color:var(--text-secondary);white-space:nowrap}.progress-bar{width:100%;height:8px;background-color:var(--bg-secondary);border-radius:4px;overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color) 0%,var(--primary-hover) 100%);border-radius:4px;transition:width .3s ease;position:relative}.progress-fill:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.3) 50%,transparent 100%);animation:shimmer 1.5s infinite}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.progress-percent{font-size:.85rem;font-weight:600;color:var(--primary-color);text-align:right}@media(max-width:768px){.comparison-header{flex-wrap:wrap;gap:12px}.comparison-stats{order:3;width:100%;justify-content:space-around}.comparison-panels{grid-template-columns:1fr;grid-template-rows:1fr auto 1fr}.panel-divider{width:100%;height:1px}.comparison-legend{flex-wrap:wrap;gap:16px}}