:root{--bg-primary: #212121;--bg-secondary: #171717;--bg-tertiary: #2f2f2f;--bg-hover: #383838;--text-primary: #ececec;--text-secondary: #b4b4b4;--text-muted: #8e8e8e;--border: #424242;--accent: #8b5cf6;--accent-hover: #7c3aed;--user-bg: #2f2f2f;--assistant-bg: transparent;--sidebar-width: 260px;--header-height: 56px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;overflow:hidden}body{font-family:Söhne,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased}.app{display:flex;height:100vh;overflow:hidden}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:99}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;height:100vh;transition:transform .25s ease}.sidebar-header{padding:12px;flex-shrink:0}.new-chat-btn{width:100%;display:flex;align-items:center;gap:10px;padding:12px 16px;background:transparent;border:1px solid var(--border);border-radius:10px;color:var(--text-primary);font-size:14px;cursor:pointer;transition:background .15s}.new-chat-btn:hover{background:var(--bg-hover)}.sidebar-conversations{flex:1;overflow-y:auto;padding:4px 8px}.sidebar-conversations::-webkit-scrollbar{width:6px}.sidebar-conversations::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.sidebar-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;cursor:pointer;font-size:14px;color:var(--text-secondary);transition:background .15s;position:relative}.sidebar-item:hover{background:var(--bg-hover)}.sidebar-item.active{background:var(--bg-tertiary);color:var(--text-primary)}.sidebar-item-icon{flex-shrink:0;opacity:.6}.sidebar-item-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar-item-delete{opacity:0;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:4px;transition:all .15s;flex-shrink:0}.sidebar-item:hover .sidebar-item-delete{opacity:1}.sidebar-item-delete:hover{color:#ef4444;background:#ef44441a}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border);flex-shrink:0}.sidebar-footer-info{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-muted)}.main{flex:1;display:flex;flex-direction:column;min-width:0;height:100vh}.main-header{height:var(--header-height);display:flex;align-items:center;padding:0 16px;gap:12px;border-bottom:1px solid var(--border);flex-shrink:0;background:var(--bg-primary)}.menu-btn{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .15s}.menu-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.header-title{flex:1;font-size:16px;font-weight:600;letter-spacing:-.01em}.new-chat-header-btn{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .15s}.new-chat-header-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.messages-area{flex:1;overflow-y:auto;scroll-behavior:smooth}.messages-area::-webkit-scrollbar{width:8px}.messages-area::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.messages-area::-webkit-scrollbar-track{background:transparent}.welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:24px;max-width:720px;margin:0 auto}.welcome-icon{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#ec4899);display:flex;align-items:center;justify-content:center;margin-bottom:24px;color:#fff}.welcome h2{font-size:28px;font-weight:600;letter-spacing:-.03em;margin-bottom:32px;text-align:center}.suggestions{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;max-width:560px}.suggestion{display:flex;align-items:flex-start;gap:10px;padding:14px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:12px;color:var(--text-secondary);font-size:13px;cursor:pointer;text-align:left;line-height:1.4;transition:all .15s}.suggestion:hover{background:var(--bg-hover);border-color:var(--text-muted);color:var(--text-primary)}.suggestion-icon{flex-shrink:0;margin-top:1px;opacity:.6}.messages-list{max-width:768px;margin:0 auto;padding:24px 24px 0;width:100%}.message{display:flex;gap:16px;padding:20px 0}.message-avatar{flex-shrink:0;padding-top:2px}.avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center}.user-avatar{background:#5865f2;color:#fff}.assistant-avatar{background:linear-gradient(135deg,var(--accent),#ec4899);color:#fff}.message-content{flex:1;min-width:0}.message-role{font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-primary)}.message-text{font-size:15px;line-height:1.7;color:var(--text-primary);word-wrap:break-word}.message-paragraph{margin-bottom:8px}.message-paragraph:last-child{margin-bottom:0}.bullet-item{display:flex;gap:8px;padding:2px 0;margin-bottom:4px}.bullet{color:var(--text-muted);flex-shrink:0}.ordered-item{padding:2px 0;margin-bottom:4px}.code-block{background:#1a1a2e;border:1px solid var(--border);border-radius:8px;padding:16px;margin:12px 0;overflow-x:auto;font-family:SFMono-Regular,Fira Code,Fira Mono,Menlo,Consolas,Liberation Mono,monospace;font-size:13px;line-height:1.6;color:#e2e8f0}.inline-code{background:#8b5cf626;border:1px solid rgba(139,92,246,.2);border-radius:4px;padding:1px 6px;font-family:SFMono-Regular,Fira Code,Menlo,Consolas,monospace;font-size:13px;color:#c4b5fd}.cursor{display:inline-block;width:2px;height:18px;background:var(--accent);margin-left:2px;vertical-align:text-bottom;animation:blink .8s step-end infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.input-area{flex-shrink:0;padding:12px 24px 20px;background:var(--bg-primary)}.input-container{max-width:768px;margin:0 auto;position:relative;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:16px;display:flex;align-items:flex-end;padding:4px 4px 4px 16px;transition:border-color .15s}.input-container:focus-within{border-color:var(--accent)}.input-textarea{flex:1;background:transparent;border:none;outline:none;color:var(--text-primary);font-size:15px;font-family:inherit;line-height:1.6;padding:10px 0;resize:none;max-height:200px}.input-textarea::placeholder{color:var(--text-muted)}.input-textarea:disabled{opacity:.6}.send-btn{width:36px;height:36px;border-radius:12px;border:none;background:var(--bg-hover);color:var(--text-muted);cursor:not-allowed;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .15s}.send-btn.active{background:var(--accent);color:#fff;cursor:pointer}.send-btn.active:hover{background:var(--accent-hover)}.input-footer{max-width:768px;margin:8px auto 0;text-align:center;font-size:11px;color:var(--text-muted)}@media(max-width:768px){.sidebar{position:fixed;left:0;top:0;z-index:100;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay{display:block}.suggestions{grid-template-columns:1fr}.welcome h2{font-size:22px}.messages-list{padding:16px 16px 0}.input-area{padding:8px 12px 12px}.message{gap:12px;padding:16px 0}.avatar{width:28px;height:28px}.avatar svg{width:14px;height:14px}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message{animation:fadeIn .3s ease}::selection{background:#8b5cf64d}