:root{--bg: #0f172a;--panel: #1e293b;--bubble-user: #2563eb;--bubble-bot: #334155;--accent: #38bdf8;--ok: #22c55e;--ko: #ef4444;--warn: #f59e0b;--text: #e2e8f0;--muted: #94a3b8}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Segoe UI,Roboto,system-ui,sans-serif;background:var(--bg);color:var(--text)}.app{max-width:820px;margin:0 auto;height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid 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