:root{--bg: #f6f7f9;--surface: #ffffff;--border: #e3e6ea;--text: #16191d;--muted: #697280;--primary: #2563eb;--primary-dark: #1d4ed8;--success: #16a34a;--warn: #d97706;--danger: #dc2626;--radius: 10px;--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app-shell{display:flex;min-height:100vh}.sidebar{width:232px;background:var(--surface);border-right:1px solid var(--border);padding:20px 14px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.brand{font-weight:800;font-size:17px;padding:6px 8px 18px;letter-spacing:-.02em}.brand span{color:var(--primary)}.nav a{display:flex;align-items:center;gap:10px;padding:9px 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auto 16px;width:fit-content}.field-box{position:absolute;border:2px solid var(--primary);background:#2563eb1f;border-radius:4px;font-size:11px;color:var(--primary-dark);cursor:move;display:flex;align-items:center;justify-content:center;-webkit-user-select:none;user-select:none}.field-box .del{position:absolute;top:-9px;right:-9px;background:var(--danger);color:#fff;border-radius:50%;width:18px;height:18px;font-size:12px;display:grid;place-items:center;cursor:pointer}.sign-field{position:absolute;border:2px dashed var(--warn);background:#d9770614;border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--warn);text-align:center}.sign-field.done{border-style:solid;border-color:var(--success);background:#16a34a1a;color:var(--success)}.center-narrow{max-width:420px;width:100%}.divider{height:1px;background:var(--border);margin:16px 0}.spinner{border:3px solid 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