*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0a0a0b;--bg2:#111113;--bg3:#18181c;--bg4:#1e1e24;--border:#2a2a33;--border2:#35353f;--text:#f1f1f3;--text2:#a0a0b0;--text3:#6b6b80;--accent:#7c6af7;--accent2:#9d8fff;--accent-glow:rgba(124,106,247,0.15);--researcher:#22d3ee;--researcher-glow:rgba(34,211,238,0.12);--mainframe:#34d399;--mainframe-glow:rgba(52,211,153,0.12);--danger:#f87171;--radius:12px;--radius-sm:8px}body,html{height:100%;font-family:ui-sans-serif,-apple-system,system-ui,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:15px;-webkit-font-smoothing:antialiased;overflow:hidden}*{scrollbar-width:thin;scrollbar-color:var(--border) transparent}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.app{height:100vh}.app,.sidebar{display:flex;overflow:hidden}.sidebar{width:260px;min-width:260px;background:var(--bg2);border-right:1px solid var(--border);flex-direction:column;transition:width .2s ease}.sidebar.collapsed{width:0;min-width:0;border-right:none}.sidebar-header{padding:18px 16px 12px;justify-content:space-between;border-bottom:1px solid var(--border)}.logo,.sidebar-header{display:flex;align-items:center}.logo{gap:8px;font-weight:700;font-size:16px;letter-spacing:-.3px;color:var(--text)}.logo-mark{background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:8px;font-size:13px;font-weight:800;color:#fff;flex-shrink:0}.logo-mark,.new-chat-btn{width:28px;height:28px;display:flex;align-items:center;justify-content:center}.new-chat-btn{border-radius:7px;background:transparent;border:1px solid var(--border);color:var(--text2);cursor:pointer;font-size:16px;line-height:1;transition:all .15s}.new-chat-btn:hover{background:var(--bg3);color:var(--text);border-color:var(--border2)}.sidebar-search{padding:10px 12px;border-bottom:1px solid var(--border)}.sidebar-search input{width:100%;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;font-size:13px;color:var(--text);outline:none;transition:border-color .15s}.sidebar-search input::placeholder{color:var(--text3)}.sidebar-search input:focus{border-color:var(--border2)}.sidebar-section{padding:8px 8px 0}.sidebar-label{font-size:11px;font-weight:600;color:var(--text3);text-transform:uppercase;letter-spacing:.8px;padding:0 8px 6px}.conv-list{flex:1 1;overflow-y:auto;padding:0 8px 8px}.conv-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;color:var(--text2);font-size:13px;line-height:1.3;transition:all .12s;position:relative}.conv-item:hover{background:var(--bg3);color:var(--text)}.conv-item.active{background:var(--bg4);color:var(--text)}.conv-item .conv-title{flex:1 1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-item .conv-del{opacity:0;padding:3px 6px;border-radius:5px;background:transparent;border:none;color:var(--text3);cursor:pointer;font-size:13px;transition:all .12s;flex-shrink:0}.conv-item:hover .conv-del{opacity:1}.conv-item .conv-del:hover{background:var(--bg);color:var(--danger)}.conv-mode-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0;background:var(--border2)}.conv-mode-dot.researcher{background:var(--researcher)}.conv-mode-dot.mainframe{background:var(--mainframe)}.conv-mode-dot.chat{background:var(--accent)}.sidebar-footer{padding:10px 12px;border-top:1px solid var(--border);gap:10px}.sidebar-footer,.user-avatar{display:flex;align-items:center}.user-avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#8b5cf6);justify-content:center;font-size:12px;font-weight:600;color:#fff;flex-shrink:0}.user-info{flex:1 1;overflow:hidden}.user-name{font-size:13px;font-weight:500}.user-email,.user-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout-btn,.user-email{font-size:11px;color:var(--text3)}.logout-btn{padding:5px 8px;border-radius:6px;background:transparent;border:1px solid var(--border);cursor:pointer;transition:all .12s}.logout-btn:hover{background:var(--bg3);color:var(--danger);border-color:var(--danger)}.main{flex:1 1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg)}.topbar{height:52px;border-bottom:1px solid var(--border);gap:12px;padding:0 16px;background:var(--bg)}.toggle-sidebar-btn,.topbar{display:flex;align-items:center;flex-shrink:0}.toggle-sidebar-btn{width:30px;height:30px;border-radius:7px;background:transparent;border:1px solid var(--border);color:var(--text2);cursor:pointer;justify-content:center;font-size:15px;transition:all .12s}.toggle-sidebar-btn:hover{background:var(--bg3);color:var(--text)}.mode-tabs{display:flex;gap:4px;background:var(--bg3);border-radius:10px;padding:3px;border:1px solid var(--border)}.mode-tab{display:flex;align-items:center;gap:6px;padding:5px 12px;border-radius:7px;border:none;background:transparent;color:var(--text3);font-size:13px;font-weight:500;cursor:pointer;transition:all .15s;white-space:nowrap}.mode-tab:hover{color:var(--text2)}.mode-tab.active{background:var(--bg);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.3)}.mode-tab.active.chat{color:var(--accent2)}.mode-tab.active.researcher{color:var(--researcher)}.mode-tab.active.mainframe{color:var(--mainframe)}.mode-icon{font-size:14px}.model-select-wrap{margin-left:auto;position:relative}.model-btn{display:flex;align-items:center;gap:8px;padding:5px 12px;border-radius:var(--radius-sm);background:var(--bg3);border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:13px;font-weight:500;transition:all .15s}.model-btn:hover{border-color:var(--border2);background:var(--bg4)}.model-btn .caret{color:var(--text3);font-size:10px}.model-dropdown{position:absolute;top:calc(100% + 6px);right:0;width:260px;background:var(--bg2);border:1px solid var(--border2);border-radius:var(--radius);padding:6px;z-index:100;box-shadow:0 8px 32px rgba(0,0,0,.5)}.model-group-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text3);padding:6px 10px 4px}.model-option{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;cursor:pointer;transition:background .12s}.model-option:hover{background:var(--bg3)}.model-option.selected{background:var(--accent-glow)}.model-option-info{flex:1 1}.model-option-name{font-size:13px;font-weight:500;color:var(--text)}.model-option-desc{font-size:11px;color:var(--text3);margin-top:1px}.model-badge{font-size:10px;font-weight:600;padding:2px 6px;border-radius:4px;flex-shrink:0}.model-badge.North{background:rgba(124,106,247,.15);color:var(--accent2)}.model-badge.Flagship{background:rgba(251,191,36,.12);color:#fbbf24}.messages{flex:1 1;overflow-y:auto;padding:24px 0}.messages-inner{max-width:780px;margin:0 auto;padding:0 20px;display:flex;flex-direction:column;gap:24px}.msg{display:flex;gap:14px;animation:fadeUp .2s ease}@keyframes fadeUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0;margin-top:2px}.msg-avatar.user{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}.msg-avatar.assistant{background:var(--bg3);border:1px solid var(--border);color:var(--text2);font-size:15px}.msg-body{flex:1 1;min-width:0}.msg-meta{display:flex;align-items:center;gap:8px;margin-bottom:6px}.msg-name{font-size:13px;font-weight:600;color:var(--text)}.msg-time{font-size:11px;color:var(--text3)}.msg-content{font-size:15px;line-height:1.7;color:var(--text)}.msg-content.error{color:var(--danger)}.msg-content p{margin-bottom:10px}.msg-content p:last-child{margin-bottom:0}.msg-content a{color:var(--accent2);text-decoration:none}.msg-content a:hover{text-decoration:underline}.msg-content strong{font-weight:600;color:var(--text)}.msg-content em{font-style:italic;color:var(--text2)}.msg-content code{background:var(--bg3);border:1px solid var(--border);border-radius:4px;padding:1px 5px;font-size:13px;font-family:JetBrains Mono,Fira Code,ui-monospace,monospace;color:#e2b8ff}.msg-content pre{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;overflow-x:auto;margin:12px 0}.msg-content pre code{background:none;border:none;padding:0;font-size:13px;color:var(--text);font-family:JetBrains Mono,Fira Code,ui-monospace,monospace}.msg-content blockquote{border-left:3px solid var(--accent);padding-left:14px;color:var(--text2);margin:10px 0}.msg-content ol,.msg-content ul{padding-left:20px;margin:8px 0}.msg-content li{margin-bottom:4px}.msg-content h1,.msg-content h2,.msg-content h3{margin:16px 0 8px;font-weight:600}.msg-content h1{font-size:20px}.msg-content h2{font-size:17px}.msg-content h3{font-size:15px;color:var(--text2)}.mermaid-wrap{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;margin:12px 0;overflow-x:auto;text-align:center}.search-results{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.search-result-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;display:flex;flex-direction:column;gap:3px}.search-result-title{font-size:13px;font-weight:500;color:var(--researcher)}.search-result-snippet{font-size:12px;color:var(--text2);line-height:1.5}.search-result-url{font-size:11px;color:var(--text3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.researcher-badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;color:var(--researcher);background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.2);border-radius:4px;padding:2px 7px;margin-bottom:8px}.cursor{display:inline-block;width:2px;height:14px;background:var(--accent);border-radius:1px;animation:blink .9s step-end infinite;vertical-align:middle;margin-left:2px}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.empty-state{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;text-align:center;padding:40px 20px}.empty-icon{font-size:40px;margin-bottom:4px}.empty-title{font-size:22px;font-weight:700;letter-spacing:-.5px}.empty-sub{font-size:15px;color:var(--text2);max-width:400px;line-height:1.6}.suggestion-chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:8px;max-width:600px}.chip{padding:8px 14px;border-radius:20px;background:var(--bg3);border:1px solid var(--border);color:var(--text2);font-size:13px;cursor:pointer;transition:all .15s}.chip:hover{background:var(--bg4);color:var(--text);border-color:var(--border2)}.input-area{padding:12px 20px 16px;border-top:1px solid var(--border);background:var(--bg);flex-shrink:0}.input-wrap{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:8px}.variants-bar{display:flex;align-items:center;gap:8px;overflow-x:auto;padding-bottom:2px}.variant-chip{flex-shrink:0;padding:6px 12px;background:var(--bg3);border:1px solid var(--border);border-radius:20px;font-size:12px;color:var(--text2);cursor:pointer;transition:all .12s;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.variant-chip:hover{background:var(--bg4);color:var(--text);border-color:var(--accent)}.variant-chip.selected{background:var(--accent-glow);border-color:var(--accent);color:var(--accent2)}.variants-label{font-size:11px;color:var(--text3);white-space:nowrap;flex-shrink:0}.variants-loading{font-size:12px;color:var(--text3);display:flex;align-items:center;gap:6px}.input-box{display:flex;align-items:flex-end;gap:10px;background:var(--bg3);border:1px solid var(--border);border-radius:14px;padding:10px 10px 10px 14px;transition:border-color .15s,box-shadow .15s}.input-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.input-box.researcher:focus-within{border-color:var(--researcher);box-shadow:0 0 0 3px var(--researcher-glow)}.input-box.mainframe:focus-within{border-color:var(--mainframe);box-shadow:0 0 0 3px var(--mainframe-glow)}.input-box textarea{flex:1 1;background:transparent;border:none;outline:none;color:var(--text);font-size:15px;font-family:inherit;resize:none;line-height:1.6;max-height:200px;overflow-y:auto;padding:0}.input-box textarea::placeholder{color:var(--text3)}.input-actions{display:flex;align-items:center;gap:6px}.rephrase-btn,.send-btn{width:34px;height:34px;border-radius:9px;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.rephrase-btn{background:var(--bg4);color:var(--text3);font-size:15px}.rephrase-btn:hover:not(:disabled){background:var(--bg2);color:var(--text2)}.rephrase-btn:disabled{opacity:.4;cursor:not-allowed}.rephrase-btn.loading{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.send-btn{background:var(--accent);color:#fff;font-size:16px}.send-btn:hover:not(:disabled){background:var(--accent2)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.input-footer{display:flex;align-items:center;justify-content:space-between;padding:0 2px}.input-hint{font-size:11px;color:var(--text3)}.input-mode-pill{display:flex;align-items:center;gap:5px;font-size:11px;padding:3px 8px;border-radius:10px;font-weight:500}.input-mode-pill.chat{color:var(--accent2);background:var(--accent-glow)}.input-mode-pill.researcher{color:var(--researcher);background:var(--researcher-glow)}.input-mode-pill.mainframe{color:var(--mainframe);background:var(--mainframe-glow)}.auth-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:20px}.auth-card{background:var(--bg2);border:1px solid var(--border);border-radius:18px;padding:36px 32px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:24px}.auth-logo{gap:10px}.auth-logo,.auth-logo-mark{display:flex;align-items:center}.auth-logo-mark{width:38px;height:38px;background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:10px;justify-content:center;font-size:18px;font-weight:800;color:#fff}.auth-logo-text{font-size:22px;font-weight:700;letter-spacing:-.4px}.auth-sub{color:var(--text2);font-size:14px;margin-top:-16px}.auth-tabs{display:flex;gap:0;background:var(--bg3);border-radius:var(--radius-sm);padding:3px}.auth-tab{flex:1 1;padding:7px;border-radius:6px;border:none;background:transparent;color:var(--text3);font-size:14px;font-weight:500;cursor:pointer;transition:all .15s}.auth-tab.active{background:var(--bg);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.3)}.auth-form{gap:12px}.auth-form,.field-group{display:flex;flex-direction:column}.field-group{gap:5px}.field-label{font-size:13px;font-weight:500;color:var(--text2)}.field-input{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;font-size:14px;color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s;font-family:inherit}.field-input::placeholder{color:var(--text3)}.field-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.auth-error{background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.25);padding:10px 12px;font-size:13px;color:var(--danger)}.auth-error,.auth-submit{border-radius:var(--radius-sm)}.auth-submit{width:100%;padding:11px;background:var(--accent);border:none;color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s,opacity .15s;font-family:inherit}.auth-submit:hover:not(:disabled){background:var(--accent2)}.auth-submit:disabled{opacity:.5;cursor:not-allowed}.rate-limit-toast{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:10px;background:#2a1a1a;border:1px solid rgba(248,113,113,.35);border-radius:10px;padding:12px 16px;font-size:13px;color:var(--danger);z-index:200;box-shadow:0 8px 32px rgba(0,0,0,.5);animation:slideUp .2s ease;white-space:nowrap}@keyframes slideUp{0%{opacity:0;transform:translateX(-50%) translateY(8px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}.rate-limit-toast button{background:none;border:none;color:var(--text3);cursor:pointer;font-size:14px;padding:0 0 0 6px}.rate-limit-toast button:hover{color:var(--danger)}.continue-btn{display:inline-flex;align-items:center;gap:6px;margin-top:10px;padding:7px 14px;border-radius:8px;background:var(--bg3);border:1px solid var(--border2);color:var(--text2);font-size:13px;cursor:pointer;transition:all .15s}.continue-btn:hover{background:var(--bg4);color:var(--text);border-color:var(--accent)}.html-preview-wrap{margin-top:8px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.html-preview-bar{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;background:var(--bg2);border-bottom:1px solid var(--border);font-size:12px;color:var(--mainframe)}.html-preview-toggle{background:var(--bg3);border:1px solid var(--border2);border-radius:6px;color:var(--text2);font-size:12px;padding:3px 10px;cursor:pointer;transition:all .12s}.html-preview-toggle:hover{background:var(--bg4);color:var(--text)}.html-preview-frame{width:100%;height:480px;border:none;background:#fff}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}