:root{--bg: #f5f7fa;--panel: #ffffff;--panel-2: #eef1f6;--border: #dde3ec;--text: #1b2430;--muted: #66707e;--accent: #2f6fe0;--accent-2: #2156c0;--green: #1a8f3c;--amber: #b5790a;--red: #d12d22;--user-bubble: #e6f0ff;--assistant-bubble: #ffffff;--orange: #f5821f;--orange-2: #e06f0e;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.app{display:flex;flex-direction:column;height:100vh;height:100dvh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--panel);flex:0 0 auto}.brand{display:flex;align-items:center;gap:8px;font-weight:600}.logo{font-size:20px}.muted{color:var(--muted)}.small{font-size:12px}.ghost-btn{background:transparent;color:var(--text);border:1px solid var(--border);padding:6px 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