:root{--bg:#edf2f7;--surface:#ffffff;--surface-subtle:#f7f9fc;--surface-muted:#f3f6fa;--line:#d7e0ea;--line-strong:#c5d2e0;--text:#1b2430;--muted:#6c7a89;--brand:#163a67;--brand-strong:#0f2f57;--brand-soft:#e9f0fa;--customer:#eaf4ff;--agent:#f4f7fb;--system:#eef3f8;--danger:#c13f3f;--shadow:0 18px 46px rgba(15,30,54,0.08)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Pretendard Variable,Pretendard,Noto Sans KR,sans-serif;overflow:hidden;position:fixed;width:100%;left:0;top:0}body,html{height:100%;height:100dvh}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}.page-shell{height:100%;height:100dvh;padding:10px;overflow:hidden;display:flex;flex-direction:column}.center-stage{width:100%;height:100%;margin:0 auto}.chat-app{display:grid;grid-template-columns:272px minmax(0,1fr);height:100%;background:var(--surface);border:1px solid 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