:root{--bg-primary: #0f0f23;--bg-secondary: #1a1a2e;--bg-tertiary: #252542;--text-primary: #ffffff;--text-secondary: rgba(255, 255, 255, .7);--text-muted: rgba(255, 255, 255, .5);--accent: #6366f1;--accent-hover: #4f46e5;--success: #22c55e;--error: #ef4444;--border: rgba(255, 255, 255, .1);--sidebar-width: 280px}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f3f4f6;--bg-tertiary: #e5e7eb;--text-primary: #111827;--text-secondary: #4b5563;--text-muted: #9ca3af;--border: rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased}.layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.logo{font-size:18px;font-weight:600}.btn-close-sidebar{display:none;background:none;border:none;color:var(--text-secondary);font-size:24px;cursor:pointer}.btn-new-chat-sidebar{margin:16px;padding:12px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.btn-new-chat-sidebar:hover{background:var(--accent-hover)}.sidebar-nav{padding:8px 16px;display:flex;flex-direction:column;gap:4px}.sidebar-nav a{padding:10px 12px;border-radius:8px;color:var(--text-secondary);text-decoration:none;font-size:14px;transition:all .2s}.sidebar-nav a:hover,.sidebar-nav a.active{background:var(--bg-tertiary);color:var(--text-primary)}.conversations-list{flex:1;overflow-y:auto;padding:16px}.conversations-title{font-size:12px;color:var(--text-muted);text-transform:uppercase;margin-bottom:12px}.conversation-item{padding:10px 12px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:10px;margin-bottom:4px;transition:background .2s}.conversation-item:hover,.conversation-item.active{background:var(--bg-tertiary)}.conv-title{flex:1;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text-secondary)}.no-conversations{color:var(--text-muted);font-size:13px;text-align:center;padding:20px}.sidebar-footer{padding:16px;border-top:1px solid var(--border)}.user-info{display:flex;justify-content:space-between;margin-bottom:12px}.user-name{font-size:14px;font-weight:500}.user-balance{font-size:13px;color:var(--accent)}.btn-logout{width:100%;padding:10px;background:#ef44441a;color:var(--error);border:1px solid rgba(239,68,68,.2);border-radius:8px;cursor:pointer;font-size:13px}.mobile-header{display:none;padding:12px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border);align-items:center;gap:12px}.btn-menu{background:none;border:none;color:var(--text-primary);font-size:24px;cursor:pointer}.mobile-title{flex:1;font-weight:600}.chat-page{display:flex;flex-direction:column;height:100%}.chat-header{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:var(--bg-secondary)}.chat-title{font-size:16px;font-weight:500}.chat-actions{display:flex;align-items:center;gap:12px}.btn-new-chat{padding:8px 16px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:13px;cursor:pointer}.model-selector select{padding:8px 12px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:13px;cursor:pointer}.messages-container{flex:1;overflow-y:auto;padding:20px}.message{display:flex;gap:12px;margin-bottom:20px;max-width:800px}.message.user{flex-direction:row-reverse;margin-left:auto}.message-avatar{width:36px;height:36px;border-radius:50%;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.message-content{background:var(--bg-secondary);padding:14px 18px;border-radius:16px;max-width:calc(100% - 60px);line-height:1.6}.message.user .message-content{background:var(--accent);color:#fff}.message-meta{margin-top:8px;font-size:11px;color:var(--text-muted)}.cursor{animation:blink 1s infinite}@keyframes blink{50%{opacity:0}}.typing-indicator{display:flex;gap:4px;padding:20px}.typing-indicator span{width:8px;height:8px;background:var(--text-muted);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.empty-chat{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-icon{font-size:64px;margin-bottom:16px}.empty-chat h2{margin-bottom:8px}.suggestions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:24px}.suggestions button{padding:10px 16px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;color:var(--text-secondary);cursor:pointer;font-size:13px}.suggestions button:hover{background:var(--bg-tertiary);color:var(--text-primary)}.code-block{margin:12px 0;border-radius:8px;overflow:hidden}.code-header{display:flex;justify-content:space-between;padding:8px 12px;background:#1e1e2e;font-size:12px;color:#888}.code-header button{background:none;border:none;color:#888;cursor:pointer;font-size:12px}.inline-code{background:var(--bg-tertiary);padding:2px 6px;border-radius:4px;font-family:monospace;font-size:.9em}.input-container{padding:16px 20px;background:var(--bg-secondary);border-top:1px solid var(--border);display:flex;gap:12px;align-items:flex-end}.input-container textarea{flex:1;padding:12px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:12px;color:var(--text-primary);font-size:14px;resize:none;min-height:44px;max-height:120px;font-family:inherit}.input-container textarea:focus{outline:none;border-color:var(--accent)}.btn-attach,.btn-send{width:44px;height:44px;border-radius:12px;border:none;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center}.btn-attach{background:var(--bg-tertiary);color:var(--text-secondary)}.btn-send{background:var(--accent);color:#fff}.btn-send:disabled{opacity:.5;cursor:not-allowed}.attachments-preview{padding:8px 20px;background:var(--bg-secondary);display:flex;gap:8px;flex-wrap:wrap}.attachment-item{display:flex;align-items:center;gap:8px;padding:6px 12px;background:var(--bg-tertiary);border-radius:8px;font-size:13px}.attachment-item button{background:none;border:none;color:var(--text-muted);cursor:pointer}.chat-error{margin:0 20px;padding:12px 16px;background:#ef44441a;border:1px solid rgba(239,68,68,.2);border-radius:8px;color:#fca5a5;display:flex;justify-content:space-between;align-items:center}.chat-error button{background:none;border:none;color:inherit;cursor:pointer;font-size:18px}.balance-bar{padding:8px 20px;background:var(--bg-tertiary);font-size:13px;color:var(--accent);text-align:center}@media(max-width:768px){.sidebar{position:fixed;left:-100%;top:0;bottom:0;z-index:1000;transition:left .3s ease}.layout.sidebar-open .sidebar{left:0}.sidebar-overlay{position:fixed;inset:0;background:#00000080;z-index:999}.btn-close-sidebar{display:block}.mobile-header{display:flex}.chat-header{display:none}.message{max-width:100%}}.messages-area{flex:1;overflow-y:auto!important;padding:20px;scroll-behavior:smooth}.chat-container{display:flex;flex-direction:column;height:100%;max-height:calc(100vh - 60px);overflow:hidden}.input-form textarea{flex:1;min-height:44px;max-height:200px;padding:12px 16px;font-size:16px;border:2px solid #333;border-radius:12px;background:#1a1a2e;color:#fff;resize:none}.input-form textarea:focus{outline:none;border-color:#6366f1}.input-form{display:flex;gap:10px;align-items:flex-end;padding:16px;background:#0f0f23;border-top:1px solid #333}.input-area{flex-shrink:0}.pricing-page,.settings-page{overflow-y:auto!important;max-height:calc(100vh - 60px);padding-bottom:40px}.message-bubble img{max-width:300px;max-height:200px;object-fit:contain;border-radius:8px;cursor:pointer}.message-bubble img:hover{opacity:.9}.message-attachments{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.message-attachments img{max-width:150px;max-height:100px;object-fit:cover;border-radius:6px}.attachments-preview img,.attachment-item img{max-width:100px!important;max-height:80px!important;object-fit:cover!important;border-radius:6px!important}.attachment-item{display:flex;align-items:center;gap:8px;padding:8px;background:#ffffff1a;border-radius:8px}@media(max-width:768px){.sidebar{position:fixed;left:-280px;top:0;bottom:0;z-index:100;transition:left .3s ease}.sidebar.open{left:0}.sidebar-overlay{position:fixed;inset:0;background:#00000080;z-index:99;display:none}.sidebar-overlay.visible{display:block}.main-content{margin-left:0!important;width:100%!important}.chat-container{height:100vh;height:100dvh}.messages-area{padding:12px}.message{max-width:90%}.input-area{padding:8px}.input-form{gap:8px}.input-form textarea{font-size:16px;padding:10px 12px}.model-selector select{padding:8px;font-size:14px}.send-btn{padding:10px 14px}.mobile-header{display:flex;align-items:center;padding:12px 16px;background:#1a1a2e;border-bottom:1px solid #333;gap:12px}.burger-btn{background:none;border:none;color:#fff;font-size:24px;cursor:pointer;padding:4px}.plans-grid{grid-template-columns:1fr!important}.plan-card,.settings-page{padding:16px}.empty-chat{padding:20px}.empty-chat h2{font-size:20px}.suggestions{flex-direction:column}.suggestion-btn{width:100%}}@media(max-width:480px){.message-content{font-size:14px}.code-block{font-size:12px}.input-footer{font-size:11px}.balance,.model-cost{font-size:12px}}@supports (padding-top: env(safe-area-inset-top)){.mobile-header{padding-top:calc(12px + env(safe-area-inset-top))}.input-area{padding-bottom:calc(8px + env(safe-area-inset-bottom))}}@media(display-mode:standalone){.install-banner{display:none!important}}