:root{--bg:#f5f7f6;--surface:#fff;--text:#18201d;--muted:#66716c;--line:#dbe1de;--accent:#087a55;--accent-dark:#056443;--accent-soft:#e5f4ed;--danger:#b42318;--warning:#9a6700;--sidebar:#151b19}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--bg);color:var(--text);letter-spacing:0;margin:0;font-family:Inter,Microsoft YaHei,Arial,sans-serif}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}.center-screen{place-items:center;min-height:100vh;display:grid}.state-screen{background:#edf1ef;padding:24px}.state-panel{border:1px solid var(--line);text-align:center;background:#fff;border-radius:8px;justify-items:center;gap:12px;width:min(100%,520px);padding:38px;display:grid}.state-panel h1{margin:8px 0 0;font-size:24px}.state-panel p{color:var(--muted);margin:0;line-height:1.7}.state-panel .error-text{color:var(--danger)}.spin{animation:.8s linear infinite spin}@keyframes 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