*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #f8f9fa;--bg-dark: #1a1a2e;--sidebar-bg: #ffffff;--chat-bg: #ffffff;--artifact-bg: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--primary: #6366f1;--primary-hover: #4f46e5;--user-msg: #eff6ff;--assistant-msg: #f8fafc;--tool-bg: #fef3c7;--tool-border: #f59e0b;--error-bg: #fef2f2;--error-border: #ef4444;--success: #10b981;--radius: 8px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}#root{height:100vh}.app{display:grid;grid-template-columns:260px 1fr 340px;height:100vh}.app.artifact-hidden{grid-template-columns:260px 1fr}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:16px;border-bottom:1px solid var(--border)}.sidebar-header h2{font-size:16px;font-weight:600;color:var(--primary)}.sidebar-header p{font-size:12px;color:var(--text-muted);margin-top:4px}.new-chat-btn{display:block;width:calc(100% - 32px);margin:12px 16px;padding:10px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer}.new-chat-btn:hover{background:var(--primary-hover)}.sidebar-section{padding:12px 16px 4px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.skill-list{flex:1;overflow-y:auto;padding:0 8px}.skill-item{padding:8px 12px;border-radius:6px;cursor:pointer;font-size:13px;margin-bottom:2px}.skill-item:hover{background:var(--bg)}.skill-item .skill-name{font-weight:500}.skill-item .skill-desc{font-size:11px;color:var(--text-muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.session-list{border-top:1px solid var(--border);max-height:200px;overflow-y:auto;padding:0 8px 8px}.session-item{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;border-radius:6px;cursor:pointer;font-size:13px}.session-item:hover{background:var(--bg)}.session-item.active{background:#ede9fe;color:var(--primary)}.session-item .session-delete{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:16px;padding:0 4px}.session-item .session-delete:hover{color:var(--error-border)}.chat-panel{display:flex;flex-direction:column;height:100vh;border-right:1px solid var(--border)}.chat-messages{flex:1;overflow-y:auto;padding:20px}.chat-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-muted);text-align:center}.chat-empty h3{font-size:20px;margin-bottom:8px;color:var(--text)}.chat-empty p{font-size:14px;max-width:400px}.message{margin-bottom:16px;max-width:800px}.message.user{margin-left:auto}.message-role{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:4px}.message-content{padding:12px 16px;border-radius:var(--radius);font-size:14px;line-height:1.6;word-break:break-word}.message.user .message-content{background:var(--user-msg);border:1px solid #bfdbfe;white-space:pre-wrap}.message.assistant .message-content{background:var(--assistant-msg);border:1px solid var(--border)}.message.assistant .message-content h1,.message.assistant .message-content h2,.message.assistant .message-content h3,.message.assistant .message-content h4{margin-top:16px;margin-bottom:8px;font-weight:600;line-height:1.3}.message.assistant .message-content h1{font-size:1.4em}.message.assistant .message-content h2{font-size:1.2em}.message.assistant .message-content h3{font-size:1.05em}.message.assistant .message-content h4{font-size:1em;color:var(--text-muted)}.message.assistant .message-content h1:first-child,.message.assistant .message-content h2:first-child,.message.assistant .message-content h3:first-child{margin-top:0}.message.assistant .message-content p{margin-bottom:10px}.message.assistant .message-content p:last-child{margin-bottom:0}.message.assistant .message-content ul,.message.assistant .message-content ol{margin:8px 0;padding-left:24px}.message.assistant .message-content li{margin-bottom:4px}.message.assistant .message-content pre{background:#1e293b;color:#e2e8f0;padding:12px 16px;border-radius:6px;overflow-x:auto;margin:10px 0;font-size:13px;line-height:1.5}.message.assistant .message-content pre code{background:none;padding:0;border-radius:0;font-size:inherit;color:inherit}.message.assistant .message-content code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:.9em;font-family:Fira Code,Cascadia Code,Consolas,monospace}.message.assistant .message-content blockquote{border-left:3px solid var(--primary);padding:8px 16px;margin:10px 0;color:var(--text-muted);font-style:italic;background:#f8fafc;border-radius:0 6px 6px 0}.message.assistant .message-content table{border-collapse:collapse;width:100%;margin:10px 0;font-size:13px}.message.assistant .message-content th,.message.assistant .message-content td{border:1px solid var(--border);padding:8px 12px;text-align:left}.message.assistant .message-content th{background:#f1f5f9;font-weight:600}.message.assistant .message-content a{color:var(--primary);text-decoration:underline}.message.assistant .message-content a:hover{color:var(--primary-hover)}.message.assistant .message-content hr{border:none;border-top:1px solid var(--border);margin:16px 0}.message.assistant .message-content strong{font-weight:600}.activity-section{margin-bottom:8px}.activity-section.standalone{margin-bottom:16px}.activity-toggle{display:flex;align-items:center;gap:8px;width:100%;padding:8px 12px;background:#fef9ee;border:1px solid #fde68a;border-radius:6px;font-size:12px;font-weight:500;color:#92400e;cursor:pointer;transition:background .15s ease}.activity-toggle:hover{background:#fef3c7}.activity-toggle-icon{font-size:14px}.activity-toggle-label{flex:1;text-align:left}.activity-toggle-arrow{font-size:10px;opacity:.6}.activity-log{margin-top:6px;border-left:2px solid #fde68a;margin-left:6px;padding-left:10px}.activity-item{display:flex;align-items:center;gap:8px;padding:5px 10px;margin-bottom:3px;font-size:12px;border-radius:4px;background:var(--tool-bg);color:#92400e}.activity-item.result{background:#ecfdf5;color:#065f46}.activity-item.error{background:var(--error-bg);color:#991b1b}.activity-icon{flex-shrink:0}.streaming-indicator{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;font-size:12px;color:var(--primary)}.streaming-dot{width:6px;height:6px;background:var(--primary);border-radius:50%;animation:pulse 1.4s infinite}.streaming-dot:nth-child(2){animation-delay:.2s}.streaming-dot:nth-child(3){animation-delay:.4s}@keyframes pulse{0%,80%,to{opacity:.3;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.chat-input-area{padding:16px 20px;border-top:1px solid var(--border);background:#fff}.chat-input-form{display:flex;gap:8px}.chat-input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;font-family:inherit;resize:none;min-height:44px;max-height:120px}.chat-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px #6366f126}.chat-send-btn{padding:10px 20px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap}.chat-send-btn:hover{background:var(--primary-hover)}.chat-send-btn:disabled{opacity:.5;cursor:not-allowed}.no-session-msg{text-align:center;padding:16px;color:var(--text-muted);font-size:13px}.artifact-panel{background:var(--artifact-bg);display:flex;flex-direction:column;height:100vh;overflow:hidden}.artifact-header{padding:16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.artifact-header h3{font-size:14px;font-weight:600}.artifact-toggle-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:18px}.artifact-list{padding:8px;border-bottom:1px solid var(--border);max-height:200px;overflow-y:auto}.artifact-tab{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:6px;cursor:pointer;font-size:13px;border:none;background:none;width:100%;text-align:left}.artifact-tab:hover{background:var(--bg)}.artifact-tab.active{background:#ede9fe;color:var(--primary)}.artifact-tab-icon{flex-shrink:0}.artifact-tab-title{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.artifact-tab-type{font-size:11px;color:var(--text-muted)}.artifact-content{flex:1;overflow-y:auto;padding:16px;font-size:14px;line-height:1.6;white-space:pre-wrap;word-break:break-word}.artifact-empty{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:13px}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-muted)}.error-banner{padding:8px 16px;background:var(--error-bg);border:1px solid var(--error-border);border-radius:var(--radius);color:#991b1b;font-size:13px;margin:8px 20px}