*{margin:0;padding:0;box-sizing:border-box}html,body,#app{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:#333;background:#f5f5f5}.chat-container{display:flex;flex-direction:column;height:100%;max-width:480px;margin:0 auto;background:#fff;box-shadow:0 0 10px #0000001a}.chat-header{padding:12px 16px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:space-between}.chat-header h1{font-size:16px;font-weight:500}.chat-header .status{font-size:12px;opacity:.9}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}.status-dot.online{background:#52c41a}.status-dot.offline{background:#999}.status-dot.connecting{background:#faad14}.chat-messages{flex:1;overflow-y:auto;padding:16px;background:#f9f9f9}.message{display:flex;margin-bottom:16px}.message.inbound{justify-content:flex-start}.message.outbound{justify-content:flex-end}.message-bubble{max-width:70%;padding:10px 14px;border-radius:12px;word-break:break-word;line-height:1.5}.message.inbound .message-bubble{background:#fff;border:1px solid #e8e8e8;border-bottom-left-radius:4px}.message.outbound .message-bubble{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-bottom-right-radius:4px}.message-time{font-size:11px;color:#999;margin-top:4px}.message.outbound .message-time{text-align:right;color:#ffffffb3}.system-message{text-align:center;margin:12px 0}.system-message span{display:inline-block;padding:4px 12px;background:#e8e8e8;border-radius:10px;font-size:12px;color:#666}.chat-input{padding:12px 16px;border-top:1px solid #e8e8e8;background:#fff;display:flex;gap:10px}.chat-input textarea{flex:1;border:1px solid #d9d9d9;border-radius:8px;padding:10px 12px;font-size:14px;resize:none;outline:none;min-height:40px;max-height:100px;line-height:1.5}.chat-input textarea:focus{border-color:#667eea}.chat-input button{padding:0 20px;height:40px;border:none;border-radius:8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:14px;cursor:pointer;transition:opacity .2s}.chat-input button:hover{opacity:.9}.chat-input button:disabled{background:#ccc;cursor:not-allowed}.load-more{text-align:center;padding:10px}.load-more button{padding:6px 16px;border:1px solid #d9d9d9;border-radius:4px;background:#fff;cursor:pointer;font-size:12px;color:#666}.load-more button:hover{border-color:#667eea;color:#667eea}.empty-state{text-align:center;padding:40px 20px;color:#999}.empty-state .icon{font-size:48px;margin-bottom:16px}.chat-messages::-webkit-scrollbar{width:6px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:#ddd;border-radius:3px}.chat-messages::-webkit-scrollbar-thumb:hover{background:#ccc}.message-content .message-image{max-width:100%;border-radius:8px;display:block}.message-content .message-file{color:inherit;text-decoration:underline;word-break:break-all}.message.inbound .message-content .message-file{color:#1677ff}.message-content .message-file-size{margin-left:6px;font-size:12px;opacity:.85}