*{font-family:Raleway,sans-serif!important}:root{--primary-color: #4a6fa5;--primary-hover: #3a5a8c;--secondary-color: #6eb5c0;--accent-color: #f5b841;--text-color: #2d3748;--text-light: #4a5568;--background-light: #f8fafc;--border-color: #e2e8f0;--error-color: #e53e3e;--success-color: #38a169;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .12);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--radius-sm: 4px;--radius-md: 8px;--transition: all .3s ease}body{font-family:Segoe UI,Roboto,Arial,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--background-light);margin:0;padding:0}.container{max-width:1200px;margin:2rem auto;padding:2rem;background-color:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-md)}h1{color:var(--primary-color);font-size:2.2rem;margin-top:0;border-bottom:2px solid var(--secondary-color);padding-bottom:.5rem;margin-bottom:1.5rem}h2{color:var(--text-color);font-size:1.5rem;margin-top:0;display:flex;align-items:center;gap:.5rem}h2:before{content:"";display:inline-block;width:1rem;height:1rem;background-color:var(--secondary-color);border-radius:50%}.upload-section,.mapping-section,.preview-section{margin:1.5rem 0;padding:1.5rem;border-radius:var(--radius-md);background-color:#fff;box-shadow:var(--shadow-sm);border-left:4px solid var(--primary-color);transition:var(--transition)}.upload-section:hover,.mapping-section:hover,.preview-section:hover{box-shadow:var(--shadow-md)}.form-group{margin-bottom:1.2rem}label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-color)}select,input{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);font-family:inherit;font-size:1rem;transition:var(--transition);box-shadow:inset 0 1px 2px #0000000d}select:focus,input:focus{outline:none;border-color:var(--secondary-color);box-shadow:0 0 0 3px #6eb5c040}button{background-color:var(--primary-color);color:#fff;padding:.75rem 1.5rem;border:none;border-radius:var(--radius-sm);cursor:pointer;font-size:1rem;font-weight:600;transition:var(--transition);display:inline-flex;align-items:center;justify-content:center;gap:.5rem}button:hover{background-color:var(--primary-hover);transform:translateY(-1px)}button:active{transform:translateY(0)}button:disabled{background-color:#ccc;cursor:not-allowed;transform:none}table{width:100%;border-collapse:separate;border-spacing:0;margin-top:1rem;border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow-sm)}th,td{border:1px solid var(--border-color);padding:.75rem;text-align:left}th{background-color:var(--background-light);font-weight:600}.preview-note{font-style:italic;color:var(--text-light);margin:.5rem 0 1rem;line-height:1.4}.error-message{color:var(--error-color);margin-top:.75rem;padding:.75rem;background-color:#e53e3e1a;border-radius:var(--radius-sm);font-weight:500}.status-message{margin:1.2rem 0;padding:1rem;background-color:var(--background-light);border:1px solid var(--border-color);border-radius:var(--radius-sm);white-space:pre-wrap}pre{margin:0;white-space:pre-wrap;font-family:Consolas,Monaco,monospace;font-size:.9rem}@media (max-width: 768px){.mapping-section .column-grid{grid-template-columns:1fr}.container{padding:1rem;margin:1rem}}