:root{--brand: #0F6E56;--brand-dark: #085041;--brand-light: #E1F5EE;--accent: #185FA5;--bg: #F6F7F5;--surface: #FFFFFF;--text: #1F2937;--muted: #6B7280;--border: #E5E7EB;--danger: #B42318;--danger-bg: #FEF3F2;--radius: 14px;--shadow: 0 1px 3px rgba(0, 0, 0, .06)}*{margin:0;padding:0;box-sizing:border-box}[hidden]{display:none!important}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);display:flex;height:100dvh;overflow:hidden}#app{display:contents}.sidebar{width:264px;flex-shrink:0;height:100dvh;background:#fafaf9;border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px 10px;transition:width .18s ease,padding .18s ease;overflow:hidden}body.sb-collapsed .sidebar{width:0;padding-left:0;padding-right:0;border-right:none}.sb-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:2px 4px 12px}.sb-brand{display:flex;align-items:center;gap:9px;min-width:0}.sb-brand .brand-logo{width:32px;height:32px;border-radius:9px;font-size:16px}.sb-brand-text{min-width:0}.sb-brand-text h1{font-size:13.5px;font-weight:600;white-space:nowrap}.sb-brand-text p{font-size:11px;color:var(--muted);white-space:nowrap}.sb-collapse{background:none;border:none;color:var(--muted);cursor:pointer;font-size:17px;line-height:1;padding:4px 7px;border-radius:6px;flex-shrink:0}.sb-collapse:hover{background:#efefed;color:var(--text)}.new-conv-btn{display:flex;align-items:center;gap:7px;width:100%;padding:10px 12px;background:#fff;border:1px solid var(--border);border-radius:10px;font-size:13.5px;font-family:inherit;color:var(--text);cursor:pointer;transition:border-color .15s,background .15s}.new-conv-btn:hover{border-color:var(--brand);background:var(--brand-light)}.new-conv-btn .plus{color:var(--brand);font-size:15px;line-height:1}.sb-search{margin:10px 0 6px}.sb-search input{width:100%;border:none;background:#f0f1ef;border-radius:8px;padding:8px 11px;font-size:12.5px;font-family:inherit;color:var(--text)}.sb-search input:focus{outline:none;background:#fff;box-shadow:0 0 0 1px var(--brand)}.sb-search input::placeholder{color:#a8abb2}.conv-list{flex:1;overflow-y:auto;margin:0 -4px;padding:0 4px 8px}.conv-group{font-size:11px;color:var(--muted);padding:10px 8px 5px;letter-spacing:.2px}.conv-empty{font-size:12px;color:var(--muted);padding:12px 8px;line-height:1.7}.conv-item{display:flex;align-items:center;gap:6px;padding:8px;border-radius:8px;cursor:pointer;font-size:13px;color:#374151;margin-bottom:1px}.conv-item:hover{background:#efefed}.conv-item.active{background:#fff;color:var(--brand-dark);font-weight:500;box-shadow:0 1px 2px #00000012}.conv-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-actions{display:none;gap:1px;flex-shrink:0}.conv-item:hover .conv-actions,.conv-item.active .conv-actions{display:flex}.icon-btn{background:none;border:none;color:var(--muted);cursor:pointer;font-size:12.5px;line-height:1;padding:3px 4px;border-radius:4px}.icon-btn:hover{background:#e2e4e0;color:var(--text)}.icon-btn.danger:hover{background:#fde8e6;color:var(--danger)}.sb-foot{padding-top:10px;margin-top:6px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:6px}.sb-foot .user-wrap{width:100%}.sb-foot .user-btn{width:100%;padding:7px 10px;border-radius:10px;justify-content:flex-start}.user-menu.up{top:auto;bottom:calc(100% + 8px);left:0;right:auto}.app-main{flex:1;min-width:0;height:100dvh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0}.topbar-title{font-size:13.5px;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.sb-toggle{display:none;background:none;border:1px solid var(--border);border-radius:7px;color:var(--text);font-size:14px;cursor:pointer;width:30px;height:30px;place-items:center;flex-shrink:0;padding:0}.sb-toggle:hover{background:var(--bg)}body.sb-collapsed .sb-toggle{display:grid}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-logo{width:40px;height:40px;border-radius:10px;background:var(--brand);color:#fff;font-size:20px;font-weight:600;display:grid;place-items:center;flex-shrink:0}.brand-text{min-width:0}.brand-text h1{font-size:16px;font-weight:600}.brand-text p{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar-actions,.topbar-right{display:flex;align-items:center;gap:12px;flex-shrink:0}.kb-status{font-size:12px;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:4px 12px;white-space:nowrap}.ghost-btn{font-size:13px;color:var(--brand-dark);background:transparent;border:1px solid var(--border);border-radius:8px;padding:6px 14px;cursor:pointer;transition:background .15s}.ghost-btn:hover{background:var(--brand-light)}.chat{flex:1;overflow-y:auto;padding:24px 16px 32px;scroll-behavior:smooth}.chat-inner{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:16px}.welcome{text-align:center;padding:48px 16px;color:var(--text)}.welcome-icon{width:56px;height:56px;margin:0 auto 16px;border-radius:16px;background:var(--brand-light);color:var(--brand-dark);font-size:26px;font-weight:600;display:grid;place-items:center}.welcome h2{font-size:20px;font-weight:600;margin-bottom:8px}.welcome-sub{font-size:13px;color:var(--muted);margin-bottom:24px}.chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.chip{font-size:13px;color:var(--brand-dark);background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:8px 16px;cursor:pointer;transition:all .15s}.chip:hover{border-color:var(--brand);background:var(--brand-light)}.msg{display:flex;flex-direction:column;max-width:82%}.msg.user{align-self:flex-end;align-items:flex-end}.msg.bot{align-self:flex-start}.bubble{padding:12px 16px;border-radius:var(--radius);font-size:14px;line-height:1.7;white-space:pre-wrap;word-break:break-word}.msg.user .bubble{background:var(--brand);color:#fff;border-bottom-right-radius:4px}.msg.bot .bubble{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-bottom-left-radius:4px}.sources{margin-top:8px;background:var(--surface);border:1px solid 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.weak-toggle{margin-top:6px;background:none;border:1px dashed var(--border);border-radius:7px;padding:4px 10px;font-family:inherit;font-size:11.5px;color:var(--muted);cursor:pointer;transition:border-color .15s,color .15s}.sources .weak-toggle:hover{border-color:var(--brand);color:var(--brand-dark)}.sources-empty{margin-top:8px;color:var(--muted);font-size:12px;padding:8px 12px;border:1px dashed var(--border);border-radius:var(--radius)}.typing{display:inline-flex;gap:5px;align-items:center;padding:4px 0}.typing span{width:7px;height:7px;border-radius:50%;background:var(--brand);animation:bounce 1.2s infinite ease-in-out}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}.loading-text{color:var(--muted);font-size:13px;margin-top:6px}@keyframes 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var(--border);border-radius:999px;padding:3px 12px 3px 3px;cursor:pointer;font-family:inherit;font-size:13px;color:var(--text);transition:background .15s,border-color .15s}.user-btn:hover{border-color:var(--brand);background:var(--brand-light)}.user-caret{margin-left:auto;color:var(--muted);font-size:11px;line-height:1;padding-left:6px}.avatar{width:28px;height:28px;border-radius:50%;background:var(--brand);color:#fff;font-size:13px;font-weight:500;display:grid;place-items:center;flex-shrink:0}.avatar.guest{background:#b4b2a9}.user-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:208px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 24px #0000001f;padding:6px;z-index:40}.user-menu-head{font-size:12px;color:var(--muted);padding:8px 10px;border-bottom:1px solid 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12px;font-size:14px;font-family:inherit;background:var(--bg);color:var(--text)}.modal-field input:focus{outline:none;border-color:var(--brand);background:#fff}.modal-error{background:var(--danger-bg);color:var(--danger);border:1px solid #FECDCA;border-radius:8px;padding:8px 12px;font-size:12.5px;margin-bottom:12px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:6px}.modal-actions .send-btn{padding:9px 20px}@media(max-width:900px){.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:80;width:272px;transform:translate(-100%);transition:transform .2s ease;box-shadow:0 0 40px #00000029}body.sb-open .sidebar{transform:translate(0)}body.sb-collapsed .sidebar{width:272px}.sb-collapse{display:none}.sb-toggle{display:grid}.app-main{width:100%}.sb-mask{position:fixed;inset:0;background:#11182759;z-index:70}}@media(max-width:640px){.topbar{padding:10px 14px}.brand-text p,.kb-status,.user-label{display:none}.user-btn{padding:3px;border-radius:50%}.sb-foot 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