:root{--bg: #f5f6f8;--panel: #ffffff;--border: #e2e5ea;--text: #1a1d23;--text-muted: #6b7280;--primary: #4f46e5;--primary-text: #ffffff;--bubble-visitor: #eef0f4;--bubble-agent: #4f46e5;--bubble-agent-text: #ffffff;--danger: #dc2626}@media (prefers-color-scheme: dark){:root{--bg: #14161a;--panel: #1c1f26;--border: #2a2e37;--text: #e7e9ee;--text-muted: #9aa1ad;--bubble-visitor: #262a33;--bubble-agent: #6366f1}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}button{font-family:inherit}.btn{border:1px solid var(--border);background:var(--panel);color:var(--text);border-radius:6px;padding:8px 14px;font-size:13px;cursor:pointer}.btn--primary{background:var(--primary);color:var(--primary-text);border-color:var(--primary)}.btn--ghost{background:transparent}.btn--small{padding:4px 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