:root{--primary: #1a73e8;--primary-dark: #1557b0;--bg: #f5f5f5;--sidebar-bg: #ffffff;--chat-bg: #f0f2f5;--bubble-mine: #1a73e8;--bubble-other: #ffffff;--text-primary: #111;--text-secondary: #666;--border: #e0e0e0;--online: #34a853;--danger: #ea4335}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text-primary);height:100vh;overflow:hidden}#root{height:100vh;display:flex;flex-direction:column}.app-layout{display:flex;height:100vh;overflow:hidden}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2)}.auth-card{background:#fff;border-radius:16px;padding:40px;width:100%;max-width:400px;box-shadow:0 20px 60px #0000004d}.auth-card h1{text-align:center;margin-bottom:8px;font-size:28px}.auth-card .subtitle{text-align:center;color:var(--text-secondary);margin-bottom:32px}.auth-tabs{display:flex;gap:16px;margin-bottom:24px}.auth-tab{flex:1;padding:10px;border:none;background:#f0f0f0;border-radius:8px;cursor:pointer;font-size:15px;transition:all .2s}.auth-tab.active{background:var(--primary);color:#fff}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-size:14px;font-weight:500}.form-group input,.form-group textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:15px;outline:none;transition:border-color .2s}.form-group input:focus,.form-group textarea:focus{border-color:var(--primary)}.btn{width:100%;padding:12px;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.error-msg{color:var(--danger);font-size:13px;margin-top:8px;text-align:center}.sidebar{width:320px;background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.sidebar-header h2{font-size:18px}.sidebar-tabs{display:flex;border-bottom:1px solid var(--border)}.sidebar-tab{flex:1;padding:10px;border:none;background:transparent;cursor:pointer;font-size:14px;border-bottom:2px solid transparent;transition:all .2s}.sidebar-tab.active{border-bottom-color:var(--primary);color:var(--primary);font-weight:600}.sidebar-list{flex:1;overflow-y:auto}.sidebar-item{display:flex;align-items:center;gap:12px;padding:12px 16px;cursor:pointer;transition:background .15s;border-bottom:1px solid #f5f5f5}.sidebar-item:hover{background:#f5f5f5}.sidebar-item.active{background:#e8f0fe}.avatar-wrapper{position:relative;flex-shrink:0}.avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;background:#e0e0e0}.avatar-placeholder{width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:600}.online-dot{width:10px;height:10px;background:var(--online);border-radius:50%;border:2px solid white;position:absolute;bottom:0;right:0}.offline-dot{width:10px;height:10px;background:#ccc;border-radius:50%;border:2px solid white;position:absolute;bottom:0;right:0}.item-info{flex:1;min-width:0}.item-name{font-size:15px;font-weight:500;margin-bottom:2px;display:flex;align-items:center;gap:6px}.item-preview{font-size:13px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.robot-icon{font-size:14px}.bot-badge{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:10px;padding:2px 6px;border-radius:8px;font-weight:600}.chat-area{flex:1;display:flex;flex-direction:column;background:var(--chat-bg);overflow:hidden}.chat-area-empty{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:16px;color:var(--text-secondary)}.chat-area-empty .big-icon{font-size:80px}.chat-header{padding:12px 20px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.chat-header-info{display:flex;align-items:center;gap:10px}.chat-header-info h3{font-size:16px}.chat-header-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;border:none;border-radius:50%;background:transparent;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center;transition:background .15s}.icon-btn:hover{background:#f0f0f0}.messages-list{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:4px}.message-row{display:flex;align-items:flex-end;gap:8px;max-width:75%}.message-row.mine{align-self:flex-end;flex-direction:row-reverse}.message-row.other{align-self:flex-start}.message-bubble{padding:8px 12px;border-radius:16px;font-size:15px;line-height:1.5;word-break:break-word}.message-row.mine .message-bubble{background:var(--bubble-mine);color:#fff;border-bottom-right-radius:4px}.message-row.other .message-bubble{background:var(--bubble-other);color:var(--text-primary);border-bottom-left-radius:4px;box-shadow:0 1px 2px #0000001a}.message-meta{font-size:11px;color:var(--text-secondary);margin-top:2px;display:flex;align-items:center;gap:4px}.message-row.mine .message-meta{flex-direction:row-reverse}.message-image{max-width:280px;max-height:200px;border-radius:12px;cursor:pointer}.message-file{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#fff3;border-radius:8px;text-decoration:none;color:inherit}.message-time{font-size:11px;opacity:.7}.message-input-area{padding:12px 16px;background:#fff;border-top:1px solid var(--border);display:flex;align-items:flex-end;gap:8px}.attach-btn{width:40px;height:40px;border:none;background:transparent;cursor:pointer;font-size:22px;border-radius:50%;transition:background .15s;flex-shrink:0;display:flex;align-items:center;justify-content:center}.attach-btn:hover{background:#f0f0f0}.message-input{flex:1;min-height:40px;max-height:120px;padding:10px 14px;border:1px solid var(--border);border-radius:24px;font-size:15px;outline:none;resize:none;font-family:inherit;line-height:1.4;overflow-y:auto}.message-input:focus{border-color:var(--primary)}.send-btn{width:40px;height:40px;border:none;border-radius:50%;background:var(--primary);color:#fff;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.send-btn:hover{background:var(--primary-dark)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.persona-selector{display:flex;align-items:center;gap:6px;cursor:pointer;padding:4px 10px;border-radius:16px;border:1px solid var(--border);font-size:13px;transition:all .15s}.persona-selector:hover{background:#f0f0f0}.persona-panel{position:absolute;top:56px;right:16px;width:340px;background:#fff;border-radius:12px;box-shadow:0 8px 32px #00000026;z-index:100;overflow:hidden}.persona-panel-header{padding:16px;border-bottom:1px solid var(--border);font-weight:600;font-size:15px;display:flex;justify-content:space-between;align-items:center}.persona-grid{padding:12px;max-height:380px;overflow-y:auto;display:grid;grid-template-columns:1fr 1fr;gap:8px}.persona-card{padding:12px;border:2px solid var(--border);border-radius:10px;cursor:pointer;transition:all .15s;text-align:center}.persona-card:hover{border-color:var(--primary);background:#f0f7ff}.persona-card.selected{border-color:var(--primary);background:#e8f0fe}.persona-card-avatar{width:48px;height:48px;border-radius:50%;margin:0 auto 8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px}.persona-card-name{font-size:13px;font-weight:600;margin-bottom:4px}.persona-card-desc{font-size:11px;color:var(--text-secondary);line-height:1.3}.persona-create-btn{margin:0 12px 12px;padding:10px;border:2px dashed var(--border);border-radius:10px;background:transparent;cursor:pointer;font-size:13px;color:var(--text-secondary);transition:all .15s;text-align:center;width:calc(100% - 24px)}.persona-create-btn:hover{border-color:var(--primary);color:var(--primary)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:200}.modal{background:#fff;border-radius:16px;width:90%;max-width:480px;max-height:80vh;overflow:hidden;display:flex;flex-direction:column}.modal-header{padding:20px;border-bottom:1px solid var(--border);font-size:18px;font-weight:600;display:flex;justify-content:space-between;align-items:center}.modal-body{padding:20px;overflow-y:auto;flex:1}.modal-footer{padding:16px 20px;border-top:1px solid var(--border);display:flex;gap:8px;justify-content:flex-end}.btn-secondary{padding:8px 16px;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer;font-size:14px;transition:background .15s}.btn-secondary:hover{background:#f5f5f5}.search-bar{padding:10px 12px;border-bottom:1px solid var(--border)}.search-bar input{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:20px;font-size:14px;outline:none;background:#f5f5f5}.search-bar input:focus{background:#fff;border-color:var(--primary)}.call-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000e6;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:300;color:#fff}.call-overlay h2{font-size:24px;margin-bottom:8px}.call-overlay p{color:#ffffffb3;margin-bottom:32px}.call-buttons{display:flex;gap:24px}.call-btn{width:56px;height:56px;border-radius:50%;border:none;cursor:pointer;font-size:24px;display:flex;align-items:center;justify-content:center;transition:transform .15s}.call-btn:hover{transform:scale(1.1)}.call-btn.accept{background:var(--online);color:#fff}.call-btn.reject{background:var(--danger);color:#fff}.video-grid{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:24px;width:100%;max-width:800px;padding:0 24px}.video-grid video{flex:1;min-width:300px;height:300px;border-radius:12px;background:#222;object-fit:cover}video.remote{flex:2}.group-name-input{display:flex;gap:8px;padding:8px 12px;border-bottom:1px solid var(--border)}.group-name-input input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none}.group-name-input button{padding:8px 16px;background:var(--primary);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:14px}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-thumb{background:#ccc;border-radius:4px}input[type=file]{display:none}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#333;color:#fff;padding:10px 20px;border-radius:24px;font-size:14px;z-index:500;animation:fadeInUp .3s}@keyframes fadeInUp{0%{opacity:0;transform:translate(-50%) translateY(10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.user-panel{display:flex;align-items:center;gap:12px;padding:12px 16px;cursor:pointer;transition:background .15s;border-bottom:1px solid var(--border)}.user-panel:hover{background:#f8f9fa}.user-panel-avatar .avatar,.user-panel-avatar .avatar-placeholder{width:44px;height:44px}.user-panel-info{flex:1;min-width:0}.user-panel-name{font-size:15px;font-weight:600;margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-panel-id{font-size:11px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-panel-id-tip{color:var(--primary);font-size:10px;opacity:0;transition:opacity .15s}.user-panel:hover .user-panel-id-tip{opacity:1}.badge{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;background:var(--danger);color:#fff;border-radius:9px;font-size:11px;font-weight:700;line-height:1;margin-left:6px;vertical-align:middle;animation:badge-pop .3s cubic-bezier(.175,.885,.32,1.5)}@keyframes badge-pop{0%{transform:scale(0)}to{transform:scale(1)}}.profile-modal .modal-body{padding:24px 20px}.profile-avatar-section{display:flex;flex-direction:column;align-items:center;margin-bottom:20px}.profile-avatar-wrapper{position:relative;cursor:pointer}.avatar-overlay-hint{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:50%;background:#00000073;color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .2s;text-align:center;padding:4px;pointer-events:none}.profile-avatar-wrapper:hover .avatar-overlay-hint{opacity:1}.profile-avatar-tip{font-size:12px;color:var(--text-secondary);margin-top:8px}.profile-id-row{display:flex;gap:8px;align-items:center}.profile-id-input{flex:1;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:13px;background:#f5f5f5;color:var(--text-secondary)}.friend-request-list{display:flex;flex-direction:column}.friend-request-item{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid #f5f5f5}.friend-request-item:last-child{border-bottom:none}.friend-request-info{flex:1;min-width:0}.friend-request-name{font-size:15px;font-weight:500;margin-bottom:2px}.friend-request-time{font-size:12px;color:var(--text-secondary)}.friend-request-actions{display:flex;gap:8px;flex-shrink:0}.friend-request-btn{width:100%;padding:8px;border:1px dashed #ccc;border-radius:8px;background:#fff;cursor:pointer;font-size:13px;color:#666;display:flex;align-items:center;justify-content:center;gap:6px;transition:all .15s;position:relative}.friend-request-btn:hover{border-color:var(--primary);color:var(--primary);background:#f0f7ff}