.titian-chat-outer{max-width:720px;margin:0 auto;background:#fff;border-radius:8px;box-shadow:0 1px 6px rgba(0,0,0,.08);overflow:hidden}
.titian-chat-header{background:#0f172a;color:#fff;padding:12px 16px;font-weight:600}
.titian-chat-window{background:#f7fafc;padding:16px;overflow:auto}
.titian-msg{max-width:70%;padding:10px 12px;border-radius:12px;margin:8px 0;white-space:pre-wrap}
.titian-msg.user{background:#e7f8e4;margin-left:auto}
.titian-msg.assistant{background:#e9f0ff}
.titian-msg.human{background:#fff0bd;border:1px solid #f0d36b}
.titian-bubble-time{display:block;font-size:11px;color:#667;opacity:.7;margin-top:4px}
.titian-chat-input{display:flex;gap:8px;border-top:1px solid #e5e7eb;padding:10px;background:#fff}
.titian-chat-input input{flex:1;border:1px solid #cbd5e1;border-radius:6px;padding:10px}
.titian-chat-input button{background:#2563eb;color:#fff;border:0;border-radius:6px;padding:8px 14px;cursor:pointer}