:root{--primary: #FF548B;--primary-hover: #E63E75;--success: #00a960;--error: #dc3545;--warning: #e6a700;--text: #1a1a1a;--text-secondary: #555;--text-muted: #888;--bg: #fafafa;--bg-card: #fff;--border: #e5e5e5;--radius: 8px;--radius-lg: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:DM Sans,sans-serif;font-weight:600}.app-container{max-width:720px;margin:0 auto;padding:0 24px;min-height:100vh;display:flex;flex-direction:column}.header{padding:20px 0;border-bottom:1px solid var(--border)}.header-content{display:flex;justify-content:space-between;align-items:center}.back-link{display:flex;align-items:center;gap:8px;color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:450}.back-link:hover{color:var(--text)}.back-link svg{width:16px;height:16px}.logo-img{height:24px}.hero{padding:48px 0 32px}.hero-label{font-size:12px;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}.hero h1{font-size:28px;font-weight:700;margin-bottom:10px;letter-spacing:-.3px}.hero-description{font-size:15px;color:var(--text-secondary)}.upload-section{margin-bottom:24px}.upload-area{border:1px dashed #ccc;border-radius:var(--radius-lg);padding:48px 24px;text-align:center;cursor:pointer;background:var(--bg-card);transition:border-color .15s}.upload-area:hover,.upload-area.drag-over{border-color:var(--primary)}.upload-icon{width:48px;height:48px;margin:0 auto 16px;color:var(--text-muted)}.upload-icon svg{width:100%;height:100%}.upload-title{font-size:15px;font-weight:500;margin-bottom:4px}.upload-subtitle{font-size:13px;color:var(--text-muted);margin-bottom:12px}.upload-formats{font-size:11px;color:var(--text-muted);background:#f5f5f5;padding:4px 10px;border-radius:4px}.file-info{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius)}.file-icon{color:var(--text-muted)}.file-icon svg{width:24px;height:24px}.file-details{flex:1;display:flex;flex-direction:column}.file-name{font-size:14px;font-weight:500}.file-size{font-size:12px;color:var(--text-muted)}.remove-file{width:28px;height:28px;border:none;background:#f5f5f5;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all .15s}.remove-file:hover{background:var(--error);color:#fff}.remove-file svg{width:14px;height:14px}.section{margin-bottom:24px}.section h2{font-size:15px;font-weight:600;margin-bottom:14px}.column-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px}.column-btn{padding:12px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);font-size:13px;font-weight:500;cursor:pointer;text-align:left;transition:all .15s}.column-btn:hover{border-color:#ccc}.column-btn.selected{border-color:var(--primary);background:#ff548b0a}.column-btn .preview{display:block;font-size:11px;color:var(--text-muted);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.option-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:border-color .15s}.option-item:hover{border-color:#ccc}.option-item input{display:none}.checkbox{width:18px;height:18px;min-width:18px;border:1.5px solid #ccc;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:all .15s;font-size:11px}.option-item input:checked+.checkbox{background:var(--primary);border-color:var(--primary);color:#fff}.option-item input:checked+.checkbox:after{content:"✓"}.option-text{display:flex;flex-direction:column}.option-title{font-size:13px;font-weight:500}.option-desc{font-size:11px;color:var(--text-muted)}.action-buttons{margin-bottom:32px}.btn-primary{width:100%;padding:14px 24px;background:var(--primary);border:none;border-radius:var(--radius);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s}.btn-primary:hover{background:var(--primary-hover)}.btn-success{padding:12px 24px;background:var(--success);border:none;border-radius:var(--radius);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:opacity .15s}.btn-success:hover{opacity:.9}.btn-secondary{padding:12px 24px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;transition:border-color .15s}.btn-secondary:hover{border-color:#ccc}.results-header{margin-bottom:20px}.results-header h2{margin-bottom:16px}.results-stats{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.stat{text-align:center;padding:12px 20px;background:#f5f5f5;border-radius:var(--radius)}.stat-value{display:block;font-size:22px;font-weight:700}.stat-label{font-size:11px;color:var(--text-muted);text-transform:uppercase}.stat-divider{color:var(--text-muted)}.stat-success .stat-value{color:var(--success)}.stat-error .stat-value{color:var(--error)}.preview-container{margin-bottom:20px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.preview-table{width:100%;border-collapse:collapse;font-size:13px}.preview-table th,.preview-table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--border)}.preview-table th{background:#f8f8f8;font-size:11px;font-weight:600;text-transform:uppercase;color:var(--text-muted)}.preview-table td{font-family:SF Mono,Consolas,monospace;font-size:12px}.preview-table tr:last-child td{border-bottom:none}.preview-table tr:hover td{background:#fafafa}.status-valid{color:var(--success)}.status-invalid{color:var(--error)}.status-duplicate{color:var(--warning)}.preview-note{padding:10px 14px;font-size:12px;color:var(--text-muted);background:#f8f8f8;border-top:1px solid var(--border)}.export-actions{display:flex;gap:12px}.instructions{margin:40px 0;padding-top:32px;border-top:1px solid var(--border)}.instructions h2{font-size:15px;margin-bottom:20px}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.step{display:flex;align-items:flex-start;gap:12px}.step-num{width:28px;height:28px;min-width:28px;background:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:600}.step strong{display:block;font-size:13px;margin-bottom:2px}.step p{font-size:12px;color:var(--text-muted)}.privacy-note{padding:14px 16px;background:#f5f5f5;border-radius:var(--radius);font-size:12px;color:var(--text-secondary);margin-bottom:32px}.privacy-note strong{color:var(--text)}.footer{margin-top:auto;padding:24px 0;border-top:1px solid var(--border);text-align:center}.footer p{font-size:12px;color:var(--text-muted)}.footer a{color:var(--text-muted);text-decoration:none}.footer a:hover{color:var(--text)}.hidden{display:none!important}.fade-in{animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 640px){.options-grid{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr}.results-stats{justify-content:center}.export-actions{flex-direction:column}.btn-success,.btn-secondary{width:100%}}@media (max-width: 480px){.steps{grid-template-columns:1fr}}.ddd-option{margin-top:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.ddd-toggle{border:none;background:transparent;width:100%}.ddd-input-wrapper{margin-top:-4px;padding:0 14px 14px 44px;animation:slideDown .2s ease}.input-group{display:flex;align-items:center;max-width:160px;border:1px solid var(--border);border-radius:6px;overflow:hidden;transition:border-color .15s}.input-group:focus-within{border-color:var(--primary)}.input-prefix{background:#f5f5f5;padding:8px 12px;font-size:13px;font-weight:500;color:var(--text-muted);border-right:1px solid var(--border)}.input-group input{border:none;padding:8px 12px;width:100%;outline:none;font-size:14px;color:var(--text)}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.stat-warning .stat-value{color:var(--warning)}.processing-time{margin-top:16px;font-size:13px;color:var(--text-muted);text-align:center}.export-options{margin-bottom:24px;padding:20px;background:#f8f8f8;border-radius:var(--radius)}.export-options h3{font-size:14px;font-weight:600;margin-bottom:14px}.split-input-wrapper{margin-top:12px;padding-left:30px;animation:slideDown .2s ease}.split-input-wrapper .input-group{max-width:280px}.split-input-wrapper .input-prefix{white-space:nowrap}.split-input-wrapper .input-hint{display:block;margin-top:8px;font-size:12px;color:var(--success);font-weight:500}