:root{--bg: #f7f8fa;--surface: #ffffff;--sidebar-bg: #111827;--sidebar-hover: #1f2937;--sidebar-active: #1f2937;--sidebar-text: #d1d5db;--sidebar-text-muted: #6b7280;--sidebar-border: #1f2937;--border: #e6e8eb;--border-strong: #d6d9de;--text: #1f2328;--text-muted: #6b7280;--text-subtle: #9199a3;--accent: #4f46e5;--accent-hover: #4338ca;--accent-soft: #eef2ff;--notice-bg: #fbfbfc;--danger: #b42318;--sidebar-w: 260px;--topbar-h: 52px;--radius: 10px;--radius-sm: 8px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);--shadow-md: 0 4px 16px rgba(16, 24, 40, .08);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg)}.shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--sidebar-bg);display:flex;flex-direction:column;overflow:hidden;transition:width .2s ease,transform .2s ease;position:relative;z-index:10}.shell.sidebar-closed .sidebar{width:0;overflow:hidden}.pane{flex:1;min-width:0;display:flex;flex-direction:column;background:var(--surface);border-left:1px solid var(--border)}.sidebar-top{display:flex;align-items:center;justify-content:space-between;padding:16px 12px 12px;gap:8px;flex-shrink:0}.sidebar-brand{display:flex;align-items:center;gap:10px}.logo-sm{width:28px;height:28px;border-radius:7px;background:#fff;color:#111827;display:grid;place-items:center;font-size:13px;font-weight:700;flex-shrink:0}.sidebar-title{font-size:14px;font-weight:600;color:#f9fafb;letter-spacing:-.01em}.new-chat-btn{background:none;border:none;color:var(--sidebar-text-muted);border-radius:6px;padding:5px;display:grid;place-items:center;cursor:pointer;flex-shrink:0;transition:background .15s,color .15s}.new-chat-btn:hover{background:var(--sidebar-hover);color:#f9fafb}.search-wrap{position:relative;margin:0 10px 8px;flex-shrink:0}.search-icon{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--sidebar-text-muted);pointer-events:none}.search-input{width:100%;background:#1f2937;border:1px solid #374151;border-radius:var(--radius-sm);padding:7px 30px;font-size:13px;font-family:inherit;color:#f9fafb;outline:none;transition:border-color .15s}.search-input::placeholder{color:var(--sidebar-text-muted)}.search-input:focus{border-color:var(--accent)}.search-clear{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--sidebar-text-muted);padding:2px;cursor:pointer;display:grid;place-items:center;border-radius:4px}.search-clear:hover{color:#f9fafb}.sidebar-list{flex:1;overflow-y:auto;padding:2px 6px 8px}.sidebar-list::-webkit-scrollbar{width:4px}.sidebar-list::-webkit-scrollbar-thumb{background:#374151;border-radius:4px}.sidebar-empty{padding:20px 12px;font-size:12.5px;color:var(--sidebar-text-muted);text-align:center;line-height:1.5}.sidebar-signin-btn{margin-top:10px;font-size:13px;padding:8px 16px}.convo-group{margin-bottom:4px}.convo-group-label{font-size:11px;font-weight:500;color:var(--sidebar-text-muted);padding:8px 8px 4px;text-transform:uppercase;letter-spacing:.05em}.convo-item{display:block;width:100%;text-align:left;background:none;border:none;border-radius:var(--radius-sm);padding:7px 10px;cursor:pointer;transition:background .12s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.convo-item:hover{background:var(--sidebar-hover)}.convo-item.active{background:var(--sidebar-active)}.convo-title{font-size:13px;color:var(--sidebar-text);display:block;overflow:hidden;text-overflow:ellipsis}.search-hit{display:flex;flex-direction:column;align-items:flex-start;gap:2px;white-space:normal;padding:7px 10px}.hit-role{font-size:10.5px;font-weight:600;color:var(--sidebar-text-muted);text-transform:uppercase;letter-spacing:.04em}.hit-snippet{font-size:12.5px;color:var(--sidebar-text);line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.sidebar-footer{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-top:1px solid #1f2937;gap:8px}.sf-user{display:flex;align-items:center;gap:8px;min-width:0}.sf-label{font-size:12.5px;color:var(--sidebar-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sf-action{font-size:12px;color:var(--sidebar-text-muted);white-space:nowrap;flex-shrink:0}.sf-action:hover{color:#f9fafb}.pane-topbar{display:flex;align-items:center;gap:10px;padding:0 16px;height:var(--topbar-h);border-bottom:1px solid var(--border);flex-shrink:0}.toggle-sidebar{background:none;border:none;color:var(--text-muted);border-radius:6px;padding:6px;display:grid;place-items:center;cursor:pointer;flex-shrink:0;transition:background .15s,color .15s}.toggle-sidebar:hover{background:var(--bg);color:var(--text)}.pane-title{font-size:14px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat{flex:1;display:flex;flex-direction:column;min-height:0}.thread{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:18px;scroll-behavior:smooth}.empty{margin:auto;text-align:center;color:var(--text-muted);max-width:440px}.empty h2{font-size:17px;font-weight:600;color:var(--text);margin:0 0 6px}.empty p{font-size:13.5px;line-height:1.5;margin:0 0 18px}.suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.chip{border:1px solid var(--border-strong);background:var(--surface);color:var(--text);border-radius:999px;padding:7px 14px;font-size:13px;cursor:pointer;transition:border-color .15s,background .15s;font-family:inherit}.chip:hover{border-color:var(--accent);background:var(--accent-soft)}.row{display:flex;gap:12px;animation:rise .22s ease both}.row.user{flex-direction:row-reverse}.bubble{max-width:74%;padding:11px 14px;border-radius:var(--radius);font-size:14px;line-height:1.55;white-space:pre-wrap;word-wrap:break-word}.row.assistant .bubble{background:var(--surface);border:1px solid var(--border);border-top-left-radius:4px;box-shadow:var(--shadow-sm)}.row.user .bubble{background:var(--accent);color:#fff;border-top-right-radius:4px}.msg-avatar{width:30px;height:30px;border-radius:8px;flex-shrink:0;display:grid;place-items:center;font-size:11px;font-weight:600;margin-top:2px}.msg-avatar.user{background:var(--accent-soft);color:var(--accent)}.notice{align-self:center;max-width:80%;text-align:center;font-size:12.5px;color:var(--text-muted);background:var(--notice-bg);border:1px solid var(--border);border-radius:999px;padding:6px 14px}.notice.error{color:var(--danger);border-color:#f1d4d0;background:#fdf4f3}.typing{display:inline-flex;gap:4px;align-items:center;padding:4px 2px}.typing span{width:6px;height:6px;border-radius:50%;background:var(--text-subtle);animation:blink 1.2s infinite ease-in-out}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}.verify{margin:0 24px 8px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);padding:16px;animation:rise .22s ease both}.verify .v-head{font-size:13.5px;font-weight:600;margin-bottom:3px}.verify .v-sub{font-size:12.5px;color:var(--text-muted);margin-bottom:12px}.verify .v-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.composer{border-top:1px solid var(--border);padding:14px 24px 18px;background:var(--surface);flex-shrink:0}.composer-inner{display:flex;align-items:flex-end;gap:10px;border:1px solid var(--border-strong);border-radius:12px;padding:8px 8px 8px 14px;transition:border-color .15s,box-shadow .15s}.composer-inner:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.composer textarea{flex:1;border:none;resize:none;font-size:14px;font-family:inherit;line-height:1.5;color:var(--text);background:transparent;max-height:160px;padding:5px 0}.composer textarea:focus{outline:none}.composer-hint{margin:8px 2px 0;font-size:11.5px;color:var(--text-subtle)}.field{border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:8px 10px;font-size:13.5px;font-family:inherit;background:var(--surface);color:var(--text)}.field:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}select.field{cursor:pointer}.code-input{width:120px;letter-spacing:3px;text-align:center}button{font-family:inherit;cursor:pointer;transition:background .15s,border-color .15s,opacity .15s}.btn-primary{background:var(--accent);color:#fff;border:1px solid var(--accent);border-radius:var(--radius-sm);padding:9px 16px;font-size:13.5px;font-weight:500}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:9px 14px;font-size:13.5px;font-weight:500}.btn-secondary:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}button:disabled{opacity:.5;cursor:not-allowed}.send{width:36px;height:36px;border-radius:8px;border:none;background:var(--accent);color:#fff;display:grid;place-items:center;flex-shrink:0}.send:hover:not(:disabled){background:var(--accent-hover)}.linkbtn{background:none;border:none;color:var(--accent);font-size:13px;cursor:pointer;padding:4px 6px;border-radius:6px}.linkbtn:hover{background:var(--accent-soft)}.auth-screen{min-height:100vh;display:grid;place-items:center;padding:24px;background:var(--bg)}.auth-card{width:100%;max-width:400px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-md);padding:28px}.auth-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}.auth-title{font-size:16px;font-weight:600;letter-spacing:-.01em}.auth-subtitle{font-size:12.5px;color:var(--text-muted);margin-top:2px;line-height:1.4}.auth-label{display:block;font-size:13px;font-weight:500;color:var(--text);margin-bottom:8px}.auth-input{width:100%;margin-bottom:14px}.auth-channel{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-muted);margin-bottom:16px}.auth-channel label{display:inline-flex;align-items:center;gap:6px;cursor:pointer;color:var(--text)}.auth-channel input[type=radio]{accent-color:var(--accent)}.auth-btn{width:100%;padding:11px;font-size:14px}.auth-link{display:block;width:100%;background:none;border:none;color:var(--accent);font-size:13px;margin-top:12px;padding:4px}.auth-link:hover{text-decoration:underline}.auth-error{font-size:12.5px;color:var(--danger);margin-bottom:12px}.auth-divider{display:flex;align-items:center;text-align:center;color:var(--text-subtle);font-size:12px;margin:22px 0 16px}.auth-divider:before,.auth-divider:after{content:"";flex:1;border-top:1px solid var(--border)}.auth-divider span{padding:0 12px}.auth-guest{width:100%;background:var(--surface);border:1px solid var(--border-strong);color:var(--text);border-radius:var(--radius-sm);padding:11px;font-size:14px;font-weight:500}.auth-guest:hover{border-color:var(--accent);color:var(--accent)}.auth-note{font-size:11.5px;color:var(--text-subtle);text-align:center;line-height:1.5;margin:16px 0 0}.avatar{width:26px;height:26px;border-radius:50%;background:#374151;color:#d1d5db;display:grid;place-items:center;font-size:11px;font-weight:600;flex-shrink:0}.thread::-webkit-scrollbar{width:10px}.thread::-webkit-scrollbar-thumb{background:#dfe2e6;border-radius:6px;border:3px solid var(--surface)}.thread::-webkit-scrollbar-thumb:hover{background:#cdd2d8}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes blink{0%,80%,to{opacity:.25}40%{opacity:1}}@media (max-width: 640px){.shell.sidebar-open .sidebar{position:absolute;height:100%;z-index:20}.shell.sidebar-open .pane:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#0000004d;z-index:15;pointer-events:none}.sidebar{width:260px}.shell.sidebar-closed .sidebar{width:0}}.logo-sm{width:32px;height:32px;border-radius:8px;overflow:hidden;flex-shrink:0;background:#fff;display:grid;place-items:center}.ava-logo-sm{width:100%;height:100%;object-fit:contain;display:block}.msg-avatar.assistant{background:#fff;border:1px solid var(--border);box-shadow:var(--shadow-sm);overflow:hidden;padding:2px}.ava-avatar-img{width:100%;height:100%;object-fit:contain;display:block;border-radius:6px}.auth-logo{width:64px;height:64px;flex-shrink:0;display:flex;align-items:center;justify-content:center}.ava-logo-auth{width:64px;height:64px;object-fit:contain;display:block}.empty-logo{display:flex;justify-content:center;margin-bottom:16px}.ava-logo-welcome{width:96px;height:96px;object-fit:contain;display:block;filter:drop-shadow(0 4px 16px rgba(79,70,229,.18))}.restore-splash{height:100vh;display:grid;place-items:center;background:var(--bg);color:var(--text-muted);font-size:14px}