:root{--bg: #0a0e1a;--bg-elev: #131a2a;--bg-bubble-user: linear-gradient(135deg, #6366f1, #8b5cf6);--bg-bubble-agent: #1e2740;--text: #e8ecf5;--text-dim: #8d95ad;--accent: #8b5cf6;--border: #1f2740;--danger: #ef4444;--ok: #22c55e}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,system-ui,sans-serif}body{-webkit-font-smoothing:antialiased;overflow:hidden}#app{display:grid;grid-template-rows:auto 1fr auto auto;height:100vh;height:100dvh;max-width:480px;margin:0 auto;background:var(--bg);position:relative}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg-elev);border-bottom:1px solid var(--border);padding-top:max(12px,env(safe-area-inset-top))}.topbar-left{display:flex;gap:12px;align-items:center}.agent-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#ec4899);display:grid;place-items:center;font-size:18px}.agent-name{font-weight:600;font-size:15px}.agent-status{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--text-dim);margin-top:2px}.dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 8px var(--ok)}.iconbtn{background:transparent;border:none;color:var(--text-dim);font-size:18px;cursor:pointer;padding:8px;border-radius:8px}.iconbtn:hover{background:var(--bg-elev);color:var(--text)}.messages{overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.loading{text-align:center;color:var(--text-dim);padding:40px 0;font-size:13px}.bubble-row{display:flex;gap:8px;max-width:100%;animation:pop .18s ease-out}.bubble-row.user{justify-content:flex-end}.bubble-row.agent{justify-content:flex-start}.bubble-row.system{justify-content:center}.bubble{max-width:78%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.45;word-break:break-word;white-space:pre-wrap}.bubble-row.user .bubble{background:var(--bg-bubble-user);color:#fff;border-bottom-right-radius:4px}.bubble-row.agent .bubble{background:var(--bg-bubble-agent);color:var(--text);border-bottom-left-radius:4px}.bubble-row.system .bubble{background:transparent;color:var(--text-dim);font-size:12px;padding:4px 12px;border:1px dashed var(--border);border-radius:12px}.bubble img{max-width:220px;max-height:280px;border-radius:8px;display:block;margin:2px 0;cursor:zoom-in}.meta{font-size:10px;color:var(--text-dim);margin:2px 4px 0}.bubble-row.user .meta{text-align:right}.typing{padding:4px 16px 0;font-size:12px;color:var(--text-dim);font-style:italic}.composer{display:flex;gap:8px;align-items:flex-end;padding:10px 12px;padding-bottom:max(10px,env(safe-area-inset-bottom));background:var(--bg-elev);border-top:1px solid var(--border)}#input{flex:1;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:18px;padding:10px 14px;font-size:14px;resize:none;max-height:96px;outline:none;font-family:inherit}#input:focus{border-color:var(--accent)}.sendbtn{background:var(--accent);color:#fff;border:none;border-radius:18px;padding:10px 16px;font-size:14px;font-weight:600;cursor:pointer}.sendbtn:disabled{background:#3a3f55;cursor:not-allowed}@keyframes pop{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}@media (min-width: 600px){#app{max-width:480px;border-left:1px solid var(--border);border-right:1px solid var(--border)}}