:root{--bg: #f3f4f6;--panel: #ffffff;--border: #e5e7eb;--text: #111827;--muted: #6b7280;--primary: #2563eb;--primary-dark: #1d4ed8;--primary-soft: #dbeafe;--danger: #dc2626;--canvas-bg: #d1d5db;--radius: 8px;font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}button,input,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}.app{height:100%;display:flex;flex-direction:column;overflow:hidden}.topbar{display:flex;align-items:center;gap:16px;height:56px;padding:0 16px;background:#0f172a;color:#fff;flex-shrink:0}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;background:none;border:none;color:#fff;padding:4px 8px 4px 4px;border-radius:10px}.brand:hover{background:#1e293b}.brand-icon{width:32px;height:32px;border-radius:8px;box-shadow:0 0 0 1px #3b82f659}.doc-name{background:transparent;border:1px solid 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var(--border);border-radius:8px}.merge-idx{width:22px;height:22px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-size:12px;font-weight:600;flex-shrink:0}.merge-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}.merge-add{display:flex;align-items:center;justify-content:center;gap:6px;padding:14px;border:2px dashed #cbd5e1;border-radius:8px;background:#f8fafc;color:var(--primary);font-weight:500}.merge-add:hover{border-color:var(--primary)}.format-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:16px}.format-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:18px 12px;border:2px solid var(--border);border-radius:10px;background:#fff}.format-card span{font-size:12px;color:var(--muted);text-align:center}.format-card.on{border-color:var(--primary);background:#f8fbff}.format-card.on 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