:root{--bg:#212121;--bg-elevated:#2f2f2f;--bg-input:#303030;--border:#444;--border-subtle:rgba(255,255,255,0.08);--text:#ececec;--text-secondary:#b4b4b4;--text-tertiary:#8e8e8e;--accent:#10a37f;--user-bubble:#2f2f2f;--radius-lg:28px}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%}body{background:var(--bg);color:var(--text);font-family:ui-sans-serif,-apple-system,Segoe UI,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}.shell{display:flex;flex-direction:column;height:100dvh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;flex-shrink:0}.brand{display:flex;align-items:baseline;gap:8px;font-weight:600;font-size:17px}.brand 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