*{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f7f7f8;--surface:#fff;--text:#1a1a1a;--text-muted:#6b7280;--primary:#1890ff;--primary-hover:#0e7fe0;--user-bubble:#1890ff;--user-text:#fff;--assistant-bubble:#f0f0f0;--assistant-text:#1a1a1a;--border:#e5e7eb;--radius:12px}html,body{height:100%;overflow:hidden}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}#root{height:100dvh}.app{flex-direction:column;width:100vw;max-width:100vw;height:100%;display:flex}.app-header{border-bottom:1px solid var(--border);background:var(--surface);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.app-header h1{letter-spacing:-.02em;font-size:20px;font-weight:700}.reset-btn{color:var(--text-muted);border:1px solid var(--border);cursor:pointer;white-space:nowrap;background:0 0;border-radius:6px;padding:6px 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