:root{--text:#18212f;--text-secondary:#344960;--text-muted:#4e6377;--bg-page:#e8edf3;--shell-tint-1:#0a567c1f;--shell-tint-2:#a044321f;--panel-bg:#f8fafc;--panel-border:#ccd5df;--panel-shadow:#18212f2e;--header-bg:#fff;--divider:#dce3ea;--system-bg:#edf4f8;--error-border:#f0b4aa;--error-text:#7a2218;--error-bg:#fff0ee;--input-bg:#fff;--input-border:#bdc9d5;--accent:#195a72;--accent-outline:#195a722e;--bubble-bg:#fff;--bubble-border:#d4dde7;--bubble-shadow:#18212f0f;--code-bg:#18212f0f;--code-bg-strong:#18212f14;--primary-btn-bg:#b34b3b;--secondary-btn-bg:#e6f0f4;--footer-bg:#f2f5f8;--meta-text:#5d7184;--scoreboard-shadow:#18212f1f;color:var(--text);background:var(--bg-page);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}:root[data-theme=dark]{--text:#e7edf5;--text-secondary:#b9c4d1;--text-muted:#8ea0b3;--bg-page:#10161d;--shell-tint-1:#2f88ab2e;--shell-tint-2:#c8604c24;--panel-bg:#1b232d;--panel-border:#2c3947;--panel-shadow:#00000080;--header-bg:#202a35;--divider:#2c3947;--system-bg:#1e2a33;--error-border:#6e2f28;--error-text:#ffb4a8;--error-bg:#2c1613;--input-bg:#141b23;--input-border:#3a4a5a;--accent:#3f96b8;--accent-outline:#3f96b847;--bubble-bg:#202a35;--bubble-border:#2c3947;--bubble-shadow:#0006;--code-bg:#ffffff0f;--code-bg-strong:#ffffff1a;--primary-btn-bg:#c8604c;--secondary-btn-bg:#223140;--footer-bg:#182029;--meta-text:#8ea0b3;--scoreboard-shadow:#0006}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}.app-shell{background:linear-gradient(135deg, var(--shell-tint-1), transparent 38%), linear-gradient(315deg, var(--shell-tint-2), transparent 42%), var(--bg-page);flex-wrap:wrap;justify-content:center;align-items:center;gap:24px;min-height:100vh;padding:24px;display:flex}.chat-panel{border:1px solid var(--panel-border);background:var(--panel-bg);width:min(1040px,100%);height:min(860px,100vh - 48px);min-height:620px;box-shadow:0 20px 60px var(--panel-shadow);border-radius:8px;grid-template-rows:auto auto auto auto 1fr auto auto;grid-template-areas:"header""system""objective""error""messages""composer""footer";display:grid;overflow:hidden}.chat-header{border-bottom:1px solid var(--divider);background:var(--header-bg);grid-area:header;justify-content:space-between;align-items:center;gap:16px;padding:22px 24px;display:flex}.header-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;display:flex}.theme-toggle{border:1px solid var(--divider);min-height:36px;color:var(--text-secondary);background:var(--secondary-btn-bg);border-radius:8px;padding:0 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var(--accent);background:var(--panel-bg);max-width:min(360px,100% - 32px);box-shadow:0 8px 24px var(--panel-shadow);color:var(--text);border-radius:10px;padding:14px 16px;position:fixed;top:16px;right:16px}.score-toast strong{color:var(--accent)}.score-toast-list{color:var(--text-secondary);flex-direction:column;gap:4px;margin:6px 0 0;padding:0;font-size:.85rem;list-style:none;display:flex}.error-banner{border:1px solid var(--error-border);color:var(--error-text);background:var(--error-bg);border-radius:8px;grid-area:error;margin:16px 24px 0;padding:12px 14px}.login-panel{grid-template-rows:auto auto auto 1fr;grid-template-areas:"header""error""intro""form";max-width:620px}.chat-panel.login-panel{height:auto;min-height:0}.login-intro{width:min(420px,100% - 48px);color:var(--text-secondary);grid-area:intro;margin:20px auto 0;font-size:.9rem;line-height:1.5}.login-intro h2{color:var(--text);margin:0 0 8px;font-size:1.05rem}.login-intro h3{color:var(--text);margin:14px 0 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