:root{--panel:#fff;--edge:#d9d9d9;--ink:#111;--muted:#666;color:var(--ink);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f5f5f5;font-family:Arial,Helvetica,sans-serif;line-height:1.5}*{box-sizing:border-box}body{min-width:320px;margin:0}#root{min-height:100vh}a{color:inherit}button,input,select,textarea{font:inherit}h1,h2,p{margin:0}h1{font-size:1.5rem;line-height:1.2}h2{font-size:1rem}code,small{font-family:Consolas,Liberation Mono,monospace}.shell{max-width:1200px;margin:0 auto;padding:24px}.topbar{margin-bottom:24px}.topbar p{color:var(--muted);margin-top:4px}.repo-link{color:var(--muted);margin-top:8px;text-decoration:none;display:inline-block}.repo-link:hover{text-decoration:underline}.workspace{grid-template-columns:minmax(320px,1.1fr) minmax(320px,.9fr);gap:16px;display:grid}.panel{background:var(--panel);border:1px solid var(--edge);box-shadow:none;border-radius:12px;padding:24px}.section-header{justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px;display:flex}.toggle-row{gap:8px;display:flex}.chip,.primary,.secondary{border:1px solid var(--edge);cursor:pointer;font:inherit;border-radius:8px;transition:background-color .14s,border-color .14s}.chip{color:var(--ink);background:#fff;padding:8px 12px}.chip.active,.chip.active,.primary{background:var(--ink);border-color:var(--ink);color:#fff}.field{gap:8px;display:grid}.grid{gap:16px;display:grid}.two-up{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:16px}.field span,.section-header h2{color:var(--ink);font-size:.98rem;font-weight:700}textarea,select,input[type=range]{width:100%}textarea,select{border:1px solid var(--edge);color:var(--ink);font:inherit;background:#fff;border-radius:8px;padding:12px}textarea{resize:vertical;min-height:260px}.check-grid{flex-wrap:wrap;gap:14px;margin:8px 0 24px;display:flex}.checkbox{align-items:center;gap:10px;display:inline-flex}.checkbox input{accent-color:#7d5524}.actions{flex-wrap:wrap;gap:12px;margin-bottom:16px;display:flex}.primary,.secondary{justify-content:center;padding:10px 14px;text-decoration:none;display:inline-flex}.secondary{color:var(--ink);background:#fff}.primary:disabled{cursor:wait;opacity:.72}.status{border:1px solid var(--edge);color:var(--muted);border-radius:8px;padding:12px}.status.error{color:#8a2f1f;border-color:#e4b4ac}.preview-panel{flex-direction:column;gap:18px;display:flex}.preview-wrap{justify-content:center;display:flex}.board{aspect-ratio:1;border:1px solid var(--edge);box-shadow:none;background-position:50%;background-size:cover;border-radius:8px;grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);width:min(100%,620px);display:grid;overflow:hidden}.square{justify-content:center;align-items:center;display:flex;position:relative}.coord{pointer-events:none;font-size:.72rem;font-weight:700;position:absolute}.coord.file{color:#6d5331eb;bottom:8px;right:8px}.coord.rank{color:#6d5331eb;top:8px;left:8px}.coord.dark{color:#fff7edf0}.piece{object-fit:contain;pointer-events:none;-webkit-user-select:none;user-select:none;width:92%;height:92%;display:block}.preview-copy code{word-break:break-word;margin-top:8px;display:block}.empty-state{border:1px dashed var(--edge);color:var(--muted);text-align:center;border-radius:8px;justify-content:center;align-items:center;min-height:320px;padding:24px;display:flex}@media (width<=1080px){.workspace{grid-template-columns:1fr}}@media (width<=720px){.shell{padding:16px}.panel{padding:18px}.two-up{grid-template-columns:1fr}.section-header{flex-direction:column;align-items:flex-start}}