*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f1117;--bg-sidebar: #171923;--bg-input: #1e2130;--bg-user: #2d3748;--bg-assistant: #1a1f2e;--border: #2d3748;--text: #e2e8f0;--text-muted: #718096;--accent: #6366f1;--accent-hover: #4f46e5;--radius: 12px}html,body,#root{height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;line-height:1.6}.app{display:flex;height:100%}.sidebar{width:260px;background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:20px 16px 16px;border-bottom:1px solid var(--border)}.sidebar-header h1{font-size:18px;font-weight:700;letter-spacing:-.3px;background:linear-gradient(135deg,#6366f1,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.sidebar-header p{font-size:11px;color:var(--text-muted);margin-top:2px}.new-chat-btn{margin:12px 16px;padding:10px 16px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;width:calc(100% - 32px);transition:background .15s;display:flex;align-items:center;gap:8px}.new-chat-btn:hover{background:var(--accent-hover)}.conv-list{flex:1;overflow-y:auto;padding:4px 8px 16px}.conv-item{padding:10px 12px;border-radius:8px;cursor:pointer;margin-bottom:2px;transition:background .1s}.conv-item:hover{background:#ffffff0f}.conv-item.active{background:#6366f126}.conv-item-title{font-size:13px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-item-meta{font-size:11px;color:var(--text-muted);margin-top:2px}.chat-main{flex:1;display:flex;flex-direction:column;min-width:0}.chat-messages{flex:1;overflow-y:auto;padding:24px 0;scroll-behavior:smooth}.message-wrapper{max-width:760px;margin:0 auto 8px;padding:0 24px}.message{padding:14px 18px;border-radius:var(--radius);max-width:85%}.message.user{background:var(--bg-user);margin-left:auto;border-bottom-right-radius:4px}.message.assistant{background:var(--bg-assistant);margin-right:auto;border-bottom-left-radius:4px;border:1px solid var(--border)}.message-role{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);margin-bottom:6px}.message.user .message-role{color:#a78bfa}.message.assistant .message-role{color:#34d399}.message-content{font-size:14px;line-height:1.7}.message-content p{margin-bottom:8px}.message-content p:last-child{margin-bottom:0}.message-content code{background:#ffffff1a;padding:2px 6px;border-radius:4px;font-size:13px;font-family:SF Mono,Fira Code,monospace}.message-content pre{background:#0006;border:1px solid var(--border);border-radius:8px;padding:12px;overflow-x:auto;margin:8px 0}.message-content pre code{background:none;padding:0}.message-content ul,.message-content ol{padding-left:20px;margin-bottom:8px}.sources{margin-top:8px;font-size:11px;color:var(--text-muted);display:flex;flex-wrap:wrap;gap:4px}.source-tag{background:#6366f126;color:#a5b4fc;padding:2px 8px;border-radius:4px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-muted);text-align:center;padding:40px}.empty-state .logo{font-size:48px;margin-bottom:16px}.empty-state h2{font-size:24px;color:var(--text);margin-bottom:8px}.empty-state p{font-size:14px}.chat-input-area{padding:16px 24px 24px;border-top:1px solid var(--border);background:var(--bg)}.input-wrapper{max-width:760px;margin:0 auto;display:flex;gap:10px;align-items:flex-end;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;transition:border-color .15s}.input-wrapper:focus-within{border-color:var(--accent)}.chat-textarea{flex:1;background:transparent;border:none;outline:none;color:var(--text);font-size:15px;line-height:1.5;resize:none;max-height:200px;min-height:24px;font-family:inherit}.chat-textarea::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent);color:#fff;border:none;border-radius:8px;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s,opacity .15s}.send-btn:hover:not(:disabled){background:var(--accent-hover)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.typing-indicator{display:flex;align-items:center;gap:4px;padding:14px 18px;background:var(--bg-assistant);border:1px solid var(--border);border-radius:var(--radius);border-bottom-left-radius:4px;max-width:80px}.typing-dot{width:6px;height:6px;background:var(--text-muted);border-radius:50%;animation:bounce 1.2s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:translateY(0);opacity:.5}40%{transform:translateY(-6px);opacity:1}}@media (max-width: 768px){.sidebar{display:none}.chat-messages{padding:16px 0}.message-wrapper{padding:0 12px}.chat-input-area{padding:12px 12px 20px}}