:root{--primary: #1a73e8;--primary-light: #e8f0fe;--primary-dark: #1557b0;--primary-hover: #1b66c9;--bg: #f0f2f5;--bg-card: #ffffff;--bg-sidebar: #1e293b;--bg-sidebar-hover: #334155;--bg-sidebar-active: #1a73e8;--text: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--text-sidebar: #cbd5e1;--text-sidebar-active: #ffffff;--border: #e2e8f0;--success: #22c55e;--success-bg: #f0fdf4;--warning: #f59e0b;--warning-bg: #fffbeb;--danger: #ef4444;--danger-bg: #fef2f2;--radius: 8px;--radius-lg: 12px;--shadow: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.1);--shadow-lg: 0 4px 6px rgba(0,0,0,.07), 0 10px 15px rgba(0,0,0,.1);--transition: all .2s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Noto Sans SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);height:100vh;-webkit-font-smoothing:antialiased;font-size:14px;line-height:1.5}#root{height:100vh}input,button,select,textarea{font-family:inherit}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:2px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#1a73e8,#1557b0,#0d47a1);position:relative}.login-page:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:radial-gradient(2px 2px at 20px 30px,rgba(255,255,255,.15),transparent),radial-gradient(2px 2px at 40px 70px,rgba(255,255,255,.1),transparent),radial-gradient(2px 2px at 50px 160px,rgba(255,255,255,.12),transparent),radial-gradient(2px 2px at 90px 40px,rgba(255,255,255,.1),transparent),radial-gradient(2px 2px at 130px 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button{flex:1;padding:9px;border:none;background:transparent;cursor:pointer;font-size:14px;font-weight:500;border-radius:6px;transition:var(--transition);color:var(--text-secondary)}.login-card .tabs button.active{background:var(--bg-card);color:var(--primary);box-shadow:var(--shadow)}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:13px;font-weight:500;margin-bottom:5px;color:var(--text-secondary)}.form-group .input-wrap{position:relative}.form-group .input-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);font-size:15px;pointer-events:none}.form-group input:not([type]),.form-group input[type=text],.form-group input[type=password],.form-group input[type=number],.form-group select{width:100%;padding:10px 12px 10px 38px;border:1.5px solid var(--border);border-radius:var(--radius);font-size:14px;background:var(--bg);transition:var(--transition);outline:none;color:var(--text)}.form-group input:not([type]):focus,.form-group 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var(--border)}.chat-sessions{flex:1;overflow-y:auto;padding:8px}.chat-session{padding:10px 12px;border-radius:var(--radius);cursor:pointer;transition:var(--transition);margin-bottom:2px}.chat-session:hover{background:var(--bg)}.chat-session.active{background:var(--primary-light)}.chat-session .title{font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-session .meta{font-size:11px;color:var(--text-muted);margin-top:2px}.chat-main-area{flex:1;display:flex;flex-direction:column}.chat-messages{flex:1 1 0;overflow-y:auto;padding:16px 24px;min-height:0}.chat-input-area{padding:16px 24px;border-top:1px solid var(--border);background:var(--bg-card);flex-shrink:0}.chat-input-wrap{display:flex;gap:8px;background:var(--bg);border-radius:24px;padding:4px;border:1.5px solid var(--border);transition:var(--transition)}.chat-input-wrap:focus-within{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px #1a73e814}.chat-input-wrap input{flex:1;padding:10px 16px;border:none;background:transparent;font-size:14px;outline:none}.chat-input-wrap .send-btn{width:36px;height:36px;border-radius:50%;border:none;background:var(--primary);color:#fff;cursor:pointer;transition:var(--transition);margin:2px}.chat-input-wrap .send-btn:hover{background:var(--primary-dark);transform:scale(1.05)}.chat-input-wrap .send-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.msg-row{display:flex;gap:8px;margin-bottom:4px;max-width:75%}.msg-row.user{flex-direction:row-reverse;margin-left:auto}.msg-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0;font-weight:600}.msg-row.user .msg-avatar{background:var(--primary);color:#fff}.msg-row.assistant 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#fecaca;color:#991b1b;border-radius:8px;font-size:13px}.msg-row.system-error{justify-content:center}.msg-row.system-error .msg-bubble{max-width:80%;text-align:center}.msg-row.recalled{justify-content:center}.msg-row.recalled .msg-bubble{max-width:60%;text-align:center;background:#f8fafc;border:1px solid var(--border);color:#94a3b8;font-size:12px;border-radius:8px}.msg-more-btn{position:absolute;top:-4px;right:-4px;width:22px;height:22px;border-radius:50%;border:1px solid var(--border);background:#fff;color:#94a3b8;font-size:12px;line-height:1;cursor:pointer;display:none;align-items:center;justify-content:center;z-index:5;padding:0}.msg-row:hover .msg-more-btn{display:flex}.msg-more-btn:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-muted);gap:8px}.empty-state .icon{font-size:48px;opacity:.3}.empty-state 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.file-icon{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:16px}.preview-item .remove-preview{position:absolute;top:-4px;right:-4px;width:16px;height:16px;border-radius:50%;background:var(--danger);border:2px solid white;color:#fff;font-size:8px;line-height:12px;text-align:center;cursor:pointer;padding:0;transition:transform .15s}.preview-item .remove-preview:hover{transform:scale(1.2)}.file-count-label{font-size:11px;color:var(--text-muted);padding:0 4px}.toolbar-d{display:flex;align-items:center;gap:2px;padding:6px 12px 0}.toolbar-d .tool-group{display:flex;align-items:center;gap:2px}.toolbar-d .divider{width:1px;height:20px;background:var(--border);margin:0 6px;flex-shrink:0}.toolbar-d .tool-btn{width:30px;height:30px;border:none;background:transparent;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all .15s ease;position:relative}.toolbar-d 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*{overflow-wrap:break-word!important;word-break:break-word!important}.feedback-page .feedback-card{overflow:hidden}