:root{--bg-color: #f3f4f6;--surface-color: #ffffff;--border-color: #e5e7eb;--text-main: #1f2937;--text-muted: #6b7280;--primary-color: #3b82f6;--primary-hover: #2563eb;--error-color: #dc2626;--success-color: #16a34a;--upload-bg: #f9fafb}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-main);line-height:1.5;height:100vh;overflow:hidden}#root{display:flex;flex-direction:column;height:100%}header{background-color:var(--surface-color);border-bottom:1px solid var(--border-color);padding:1rem 2rem;display:flex;align-items:center;justify-content:space-between}header h1{font-size:1.25rem;font-weight:600;color:var(--text-main);margin:0;display:flex;align-items:center;gap:.5rem}header .user-icon{width:32px;height:32px;background-color:#e5e7eb;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--text-muted)}.main-container{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1.5rem;padding:1.5rem 2rem;flex:1;overflow:hidden}.pane{background-color:var(--surface-color);border-radius:8px;border:1px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden;box-shadow:0 1px 3px #0000000d}.pane-header{padding:1rem;border-bottom:1px solid var(--border-color);font-weight:600;font-size:1rem;display:flex;align-items:center;justify-content:space-between}.pane-content{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:1rem}.dropzone{border:2px dashed var(--border-color);border-radius:6px;background-color:var(--upload-bg);padding:2rem 1rem;text-align:center;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;color:var(--text-muted)}.dropzone:hover,.dropzone.active{border-color:var(--primary-color);background-color:#f5f3ff;color:var(--primary-color)}.preview-container{width:100%;aspect-ratio:1 / 1;flex-shrink:0;border:1px dashed var(--border-color);border-radius:6px;display:flex;align-items:center;justify-content:center;background-color:var(--upload-bg);overflow:hidden;margin-bottom:.5rem}.preview-container img{width:100%;height:100%;object-fit:cover}.file-list{display:flex;flex-direction:column}.file-item{padding:.75rem;border-bottom:1px solid var(--border-color);display:flex;flex-direction:column;cursor:pointer}.file-item:last-child{border-bottom:none}.file-item:hover{background-color:var(--upload-bg)}.file-item.selected{background-color:#eef2ff;border-left:3px solid var(--primary-color)}.file-item .filename{font-size:.875rem;color:var(--text-main);word-break:break-all}.file-item .error-text{font-size:.75rem;color:var(--error-color);margin-top:.25rem;display:flex;align-items:center;gap:.25rem}.file-item .success-text{font-size:.875rem;color:var(--text-main);word-break:break-all}.empty-state{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:.875rem;text-align:center}.pane-actions{padding:1rem;border-top:1px solid var(--border-color);background-color:var(--surface-color)}.btn-primary{display:block;width:100%;padding:.75rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:6px;font-weight:500;font-size:1rem;cursor:pointer;text-align:center;transition:background-color .2s}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.toast{position:fixed;bottom:1.5rem;left:50%;transform:translate(-50%);background-color:var(--text-main);color:#fff;padding:.75rem 1.5rem;border-radius:6px;box-shadow:0 4px 6px -1px #0000001a;z-index:50;display:flex;align-items:center;gap:.5rem}@media(max-width:768px){body{height:auto;overflow-y:auto;overflow-x:hidden}#root{height:auto;min-height:100vh}.main-container{grid-template-columns:1fr;gap:1rem;padding:1rem;overflow:visible}.pane{min-height:400px;max-height:none}header{padding:1rem}}