:root{--bg:#f6f7f9;--surface:#fff;--border:#e2e5ea;--text:#1c2330;--text-muted:#6b7280;--primary:#2563eb;--primary-dark:#1d4ed8;--ok:#15803d;--err:#b91c1c;--busy:#b45309;--warn:#a16207;--muted-bg:#f1f2f4}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.55}.app-shell{max-width:960px;margin:0 auto;padding:24px 16px 64px}.page h1{margin:4px 0 2px;font-size:22px}.page-sub{color:var(--text-muted);margin:0 0 16px}h2{margin:0 0 12px;font-size:16px}.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;margin-bottom:16px;padding:16px}.form{flex-direction:column;gap:10px;display:flex}.form label{flex-direction:column;gap:4px;font-weight:500;display:flex}.form input,.form textarea{font:inherit;border:1px solid var(--border);background:#fff;border-radius:6px;padding:7px 9px}.form input:focus,.form textarea:focus{outline:2px 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