.app{max-width:720px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:16px}.header{text-align:center;padding:24px 0 12px}.header h1{font-size:1.5rem;font-weight:600}.header p{color:#94a3b8;font-size:.875rem;margin-top:4px}.ctx-toggle{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-size:.8rem;color:#94a3b8;cursor:pointer}.faq-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:8px 0 12px}.faq-label{font-size:.8rem;color:#64748b;white-space:nowrap}.faq-btn{background:#1e40af;border:none;color:#e2e8f0;padding:6px 12px;border-radius:999px;font-size:.75rem;cursor:pointer}.faq-btn:hover{background:#2563eb}.chat-box{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding:12px 0;min-height:400px}.bubble{max-width:85%;padding:12px 16px;border-radius:16px;line-height:1.5;font-size:.95rem;white-space:pre-wrap}.bubble.user{align-self:flex-end;background:#3b82f6;color:#fff;border-bottom-right-radius:4px}.bubble.assistant{align-self:flex-start;background:#1e293b;border:1px solid #334155;border-bottom-left-radius:4px}.bubble.typing{opacity:.7;font-style:italic}.input-bar{display:flex;gap:8px;padding:12px 0 24px;position:sticky;bottom:0;background:linear-gradient(transparent,#0f172a 30%)}.input-bar input{flex:1;padding:12px 16px;border-radius:12px;border:1px solid #334155;background:#1e293b;color:#f1f5f9;font-size:1rem}.input-bar input:focus{outline:2px solid #3b82f6;border-color:transparent}.input-bar button{padding:12px 24px;border-radius:12px;border:none;background:#3b82f6;color:#fff;font-weight:600;cursor:pointer}.input-bar button:disabled{opacity:.5;cursor:not-allowed}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:linear-gradient(135deg,#0f172a,#1e3a5f);min-height:100vh;color:#e2e8f0}