body{margin:0}button{font-family:inherit}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;height:100vh;overflow:hidden}#root{height:100vh;overflow:hidden}:root{--bg: #F0F2F8;--sidebar-bg: #FFFFFF;--chat-bg: #F5F7FC;--surface: #FFFFFF;--surface-2: #F4F6FC;--surface-hover: #EEF0F8;--border: #E3E6F0;--border-strong: #C8CCDC;--text: #18192A;--text-2: #6A6E82;--text-3: #A8ABBE;--accent: #5C5FE8;--accent-hover: #4A4DD4;--accent-bg: #EEEEFE;--msg-user: #5C5FE8;--msg-user-text: #FFFFFF;--msg-bot: #FFFFFF;--msg-bot-text: #18192A;--sidebar-w: 268px;--r-s: 8px;--r-m: 12px;--r-l: 18px;--r-xl: 24px;--r-msg: 18px;--sh-s: 0 1px 3px rgba(12,14,30,.06);--sh-m: 0 4px 16px rgba(12,14,30,.08);--sh-l: 0 12px 40px rgba(12,14,30,.12);--t: .15s ease}.app{display:flex;height:100vh;overflow:hidden;background:var(--bg)}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;transition:transform var(--t)}.sidebar-hd{padding:16px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.sidebar-brand{display:flex;align-items:center;gap:8px}.sidebar-mark{width:28px;height:28px;background:var(--accent);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;color:#fff}.sidebar-name{font-size:14px;font-weight:700;color:var(--text)}.new-chat-btn{width:28px;height:28px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:300;transition:background var(--t),color var(--t)}.new-chat-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.chat-list-items{flex:1;overflow-y:auto;padding:8px}.chat-item{display:flex;align-items:center;gap:11px;padding:10px 11px;border-radius:var(--r-m);cursor:pointer;transition:background var(--t)}.chat-item:hover{background:var(--surface-hover)}.chat-item.active{background:var(--accent-bg)}.chat-item.active .chat-item-title{color:var(--accent);font-weight:700}.chat-item-ava{width:38px;height:38px;border-radius:50%;background:var(--accent-bg);color:var(--accent);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.chat-item-body{flex:1;min-width:0}.chat-item-title{font-size:13.5px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-item-sub{font-size:12px;color:var(--text-3);margin-top:1px}.chat-area{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--chat-bg)}.chat-hd{height:56px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:12px;flex-shrink:0;box-shadow:var(--sh-s)}.chat-hd-ava{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.chat-hd-name{font-size:14px;font-weight:700;color:var(--text);flex:1}.online-status{display:flex;align-items:center;gap:5px;font-size:12px;color:#16a34a;font-weight:500}.online-dot{width:7px;height:7px;border-radius:50%;background:#16a34a}.messages{flex:1;overflow-y:auto;padding:20px 20px 8px;display:flex;flex-direction:column;gap:6px}.msg-wrap{display:flex;align-items:flex-end;gap:8px}.msg-wrap.user{flex-direction:row-reverse}.msg-ava{width:28px;height:28px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700}.msg-ava.bot{background:var(--accent);color:#fff}.msg-ava.user{background:var(--border);color:var(--text-2)}.msg-ava.manager{background:#10b981;color:#fff}.bubble{max-width:66%;padding:9px 14px;font-size:14px;line-height:1.55;word-break:break-word}.msg-wrap.user .bubble{background:var(--msg-user);color:var(--msg-user-text);border-radius:var(--r-msg) var(--r-msg) 4px var(--r-msg);box-shadow:0 2px 6px #5c5fe84d}.msg-wrap.assistant .bubble{background:var(--msg-bot);color:var(--msg-bot-text);border-radius:var(--r-msg) var(--r-msg) var(--r-msg) 4px;border:1px solid var(--border);box-shadow:var(--sh-s)}.typing-wrap .bubble{padding:12px 16px;display:flex;align-items:center;gap:4px}.typing-dot{width:6px;height:6px;border-radius:50%;background:var(--text-3);animation:bounce 1.2s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-5px)}}.bubble.streaming{border-color:var(--accent)}.stream-cursor{display:inline-block;width:2px;height:1em;background:var(--accent);margin-left:2px;vertical-align:text-bottom;animation:blink .8s step-end infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.input-area{padding:12px 16px 16px;background:var(--surface);border-top:1px solid var(--border);display:flex;align-items:flex-end;gap:10px}.msg-input{flex:1;min-height:40px;max-height:140px;overflow-y:auto;border:1.5px solid var(--border);border-radius:20px;padding:9px 16px;font-size:14px;font-family:inherit;color:var(--text);background:var(--surface-2);outline:none;resize:none;line-height:1.5;transition:border-color var(--t)}.msg-input:focus{border-color:var(--accent)}.msg-input::placeholder{color:var(--text-3)}.send-btn{width:40px;height:40px;border-radius:50%;border:none;background:var(--accent);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background var(--t),transform var(--t)}.send-btn:hover{background:var(--accent-hover)}.send-btn:active{transform:scale(.92)}.send-btn:disabled{background:var(--border);cursor:not-allowed}.welcome{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:40px;text-align:center;color:var(--text-2)}.welcome-icon{width:60px;height:60px;border-radius:18px;background:var(--accent-bg);color:var(--accent);font-size:26px;display:flex;align-items:center;justify-content:center}.welcome-title{font-size:17px;font-weight:700;color:var(--text)}.welcome-text{font-size:14px;max-width:280px;line-height:1.6}.auth-overlay{position:fixed;inset:0;background:var(--bg);z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}.auth-box{width:100%;max-width:360px;background:var(--surface);border-radius:var(--r-xl);box-shadow:var(--sh-l);padding:36px 32px 32px;border:1px solid var(--border)}.auth-logo{display:flex;align-items:center;gap:9px;margin-bottom:26px}.auth-mark{width:32px;height:32px;background:var(--accent);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;color:#fff}.auth-brand{font-size:16px;font-weight:700;color:var(--text)}.auth-title{font-size:19px;font-weight:800;color:var(--text);letter-spacing:-.4px;margin-bottom:4px}.auth-sub{font-size:13px;color:var(--text-2);margin-bottom:22px}.auth-field{margin-bottom:13px}.auth-label{font-size:12.5px;font-weight:600;color:var(--text);margin-bottom:5px;display:block}.auth-input{width:100%;padding:9px 12px;border-radius:var(--r-m);border:1.5px solid var(--border);background:var(--surface);font-size:13.5px;color:var(--text);outline:none;font-family:inherit;transition:border-color var(--t),box-shadow var(--t)}.auth-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-bg)}.auth-input::placeholder{color:var(--text-3)}.auth-btn{width:100%;padding:10px;background:var(--accent);color:#fff;border:none;border-radius:var(--r-m);font-size:14px;font-weight:700;cursor:pointer;margin-top:4px;transition:background var(--t);font-family:inherit}.auth-btn:hover{background:var(--accent-hover)}.auth-switch{text-align:center;font-size:12.5px;color:var(--text-2);margin-top:16px}.auth-switch button{background:none;border:none;color:var(--accent);font-size:12.5px;font-weight:600;cursor:pointer;margin-left:4px}@media(max-width:700px){.sidebar{position:fixed;inset-block:0;left:0;z-index:50;transform:translate(-100%);box-shadow:var(--sh-l)}.sidebar.open{transform:translate(0)}}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}