:root{--bg-sidebar:#171717;--bg-main:#212121;--bg-input:#2f2f2f;--bg-hover:#2a2a2a;--text-primary:#fff;--text-secondary:#9b9b9b;--text-muted:#5e5e5e;--accent-color:#fff;--border-color:#333;--border-radius-lg:16px;--border-radius-md:12px;--border-radius-sm:8px;--font-sans:"Space Grotesk", system-ui, -apple-system, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-main);color:var(--text-primary);height:100vh;overflow:hidden}#root{height:100vh;display:flex}h1,h2,h3,h4,h5,h6{font-weight:500;line-height:1.2}.title-main{text-align:center;margin-bottom:8px;font-size:2.5rem}.subtitle-main{color:var(--text-secondary);text-align:center;margin-bottom:40px;font-size:.9rem}.app-container{border-radius:20px;width:100%;height:100%;display:flex;overflow:hidden}.sidebar{background-color:var(--bg-sidebar);border-right:1px solid var(--border-color);z-index:100;flex-direction:column;width:260px;padding:16px 12px;transition:width .3s cubic-bezier(.4,0,.2,1),margin-left .3s cubic-bezier(.4,0,.2,1);display:flex;overflow:visible}.sidebar.collapsed{width:60px;margin-left:0;padding:16px 8px}.sidebar.collapsed .sidebar-header{flex-direction:column;gap:16px;padding:0}.sidebar.collapsed .btn-new-chat span{display:none}.sidebar.collapsed .btn-new-chat{background:0 0;border:none;justify-content:center;width:42px;height:42px;margin-bottom:0;padding:0}.sidebar.collapsed .nav-label,.sidebar.collapsed .nav-item span:last-child,.sidebar.collapsed .user-profile div:last-child{display:none}.sidebar.collapsed .nav-item{justify-content:center;padding:12px 0}.sidebar.collapsed .user-profile{justify-content:center;padding:8px 0}.sidebar-header{align-items:center;gap:12px;margin-bottom:24px;padding:0 12px;display:flex}.btn-new-chat{color:var(--text-primary);border-radius:var(--border-radius-sm);cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;width:100%;margin-bottom:24px;padding:10px 16px;font-family:inherit;font-size:.9rem;transition:background .2s;display:flex}.btn-new-chat:hover{background:var(--bg-hover)}.nav-group{flex-direction:column;flex:1;gap:4px;display:flex;overflow-y:auto}.nav-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;padding:0 12px;font-size:.75rem}.nav-item{border-radius:var(--border-radius-sm);cursor:pointer;color:var(--text-secondary);align-items:center;gap:12px;padding:10px 12px;font-size:.9rem;transition:all .2s;display:flex}.nav-item:hover,.nav-item.active{background:var(--bg-hover);color:var(--text-primary)}.sidebar-footer{border-top:1px solid var(--border-color);flex-direction:column;gap:4px;margin-top:auto;padding-top:16px;display:flex}.upgrade-card{border:1px solid var(--border-color);border-radius:var(--border-radius-md);background:linear-gradient(145deg,#ffffff0d,#ffffff03);margin:16px 0;padding:16px}.upgrade-card h4{margin-bottom:4px;font-size:.9rem}.upgrade-card p{color:var(--text-secondary);margin-bottom:12px;font-size:.8rem}.btn-upgrade{background:var(--text-primary);color:var(--bg-sidebar);border-radius:var(--border-radius-sm);cursor:pointer;border:none;width:100%;padding:8px;font-family:inherit;font-weight:600}.main-area{flex-direction:column;flex:1;padding-top:60px;display:flex;position:relative}.main-header{justify-content:space-between;align-items:center;padding:20px 40px;display:flex}.model-selector{cursor:pointer;align-items:center;gap:8px;font-size:1.1rem;font-weight:500;display:flex}.header-actions{gap:12px;display:flex}.btn-outline{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:20px;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;display:flex}.btn-outline:hover{background:var(--bg-hover);color:var(--text-primary)}.chat-container{flex-direction:column;flex:1;padding:0 40px;display:flex;overflow-y:auto}.empty-state{flex-direction:column;align-items:center;width:100%;max-width:700px;margin:auto;padding-bottom:20vh;display:flex}.input-container{background:var(--bg-input);border:1px solid var(--border-color);border-radius:32px;flex-direction:column;gap:8px;width:100%;padding:12px 20px;display:flex;box-shadow:0 8px 24px #0003}.input-container input,.input-container textarea{color:var(--text-primary);resize:none;background:0 0;border:none;outline:none;width:100%;font-family:inherit;font-size:1rem}.input-container input::placeholder,.input-container textarea::placeholder{color:var(--text-muted)}.input-actions{justify-content:space-between;align-items:center;display:flex}.input-tools{color:var(--text-secondary);align-items:center;gap:12px;display:flex}.input-left-group{align-items:center;gap:8px;display:flex}.btn-plus{cursor:pointer;border:1px solid var(--border-color);width:28px;height:28px;color:var(--text-primary);background:0 0;border-radius:50%;justify-content:center;align-items:center;font-size:1.2rem;transition:background .2s;display:flex}.btn-plus:hover{background:#ffffff0d}.attachment-menu{border:1px solid var(--border-color);z-index:100;background:#2a2a2a;border-radius:12px;flex-direction:column;min-width:260px;padding:8px 0;display:flex;position:absolute;bottom:calc(100% + 12px);left:0;box-shadow:0 8px 32px #0006}.attachment-menu-item{cursor:pointer;color:var(--text-primary);align-items:center;gap:12px;padding:10px 16px;font-size:.9rem;transition:background .2s;display:flex}.attachment-menu-item:hover{background:#ffffff0d}.btn-send{color:var(--text-primary);cursor:pointer;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;transition:opacity .2s;display:flex}.btn-send:disabled{opacity:.3;cursor:not-allowed}.suggestions-grid{grid-template-columns:repeat(3,1fr);gap:16px;width:100%;margin-top:40px;display:grid}.suggestion-card{background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--border-radius-md);cursor:pointer;padding:16px;transition:border-color .2s}.suggestion-card:hover{border-color:var(--text-muted)}.suggestion-card h4{color:var(--text-primary);margin-bottom:8px;font-size:.9rem}.suggestion-card p{color:var(--text-secondary);font-size:.8rem}.message-list{flex-direction:column;gap:24px;width:100%;max-width:800px;margin:0 auto;padding-top:24px;padding-bottom:140px;display:flex}.message-wrapper{flex-direction:column;width:100%;display:flex}.message-wrapper.user{align-items:flex-end}.message-wrapper.assistant{align-items:flex-start}.message-content{border-radius:var(--border-radius-lg);max-width:80%;padding:12px 16px;font-size:.95rem;line-height:1.6}.message-wrapper.user .message-content{background:var(--bg-input);border-bottom-right-radius:4px}.message-wrapper.assistant .message-content{background:0 0}.message-image{border-radius:var(--border-radius-md);border:1px solid var(--border-color);max-width:100%;margin-top:16px}.markdown-body{color:var(--text-primary)}.markdown-body p{margin-bottom:16px}.markdown-body p:last-child{margin-bottom:0}.markdown-body h1,.markdown-body h2,.markdown-body h3{margin-top:24px;margin-bottom:16px;font-weight:600}.markdown-body ul,.markdown-body ol{margin-bottom:16px;padding-left:20px}.markdown-body li{margin-bottom:8px}.markdown-body code{background:#ffffff1a;border-radius:4px;padding:2px 6px;font-family:monospace;font-size:.85em}.markdown-body pre{border-radius:var(--border-radius-md);background:#1e1e1e;margin-bottom:16px;padding:16px;overflow-x:auto}.markdown-body pre code{background:0 0;padding:0}.thinking-dots{align-items:center;gap:4px;height:24px;padding:0 8px;display:flex}.thinking-dots span{background-color:var(--text-secondary);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite both bounce}.thinking-dots span:first-child{animation-delay:-.32s}.thinking-dots span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.fixed-input-wrapper{background:linear-gradient(0deg, var(--bg-main) 70%, #21212100 100%);z-index:100;justify-content:center;padding:24px 40px;display:flex;position:fixed;bottom:0;left:0;right:0}.fixed-input-wrapper .input-container{max-width:800px}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@media (width<=768px){.message-wrapper.assistant .message-content{max-width:97%;padding:12px 8px}.message-list{padding-left:10px;padding-right:10px}.fixed-input-wrapper{padding:16px 12px}.mobile-sidebar-toggle{z-index:101;position:relative;display:flex!important}.chat-header{background:var(--bg-main);z-index:99;position:sticky;top:0;padding:12px 20px!important}.sidebar{z-index:1000;position:fixed;top:0;bottom:0;left:0}.sidebar.collapsed{display:none}}.mobile-sidebar-toggle{z-index:101;color:var(--text-primary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;margin-right:12px;padding:4px;font-size:1.5rem;display:none;position:relative}.loading-spinner{border:3px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;width:40px;height:40px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.chat-empty-state{flex-direction:column;justify-content:center;align-items:center;height:100%;display:flex}