:root{--bg-primary: #000000;--bg-secondary: #0a0a0a;--bg-elevated: #141414;--bg-card: #1a1a1a;--text-primary: #ffffff;--text-secondary: #86868b;--text-tertiary: #6e6e73;--accent: #2997ff;--accent-hover: #0077ed;--border: rgba(255, 255, 255, .08);--border-light: rgba(255, 255, 255, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-xl: 28px;--font-main: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-main);background:var(--bg-primary);color:var(--text-primary);min-height:100vh}.app{display:flex;flex-direction:column;height:100vh;width:100%}.header{align-items:center;background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;padding:12px 16px;gap:12px;flex-shrink:0}.menu-btn{background:var(--bg-elevated);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:8px}.header-title{flex:1;font-size:18px;font-weight:700;text-align:center}.side-menu-overlay{background:#000000b3;bottom:0;left:0;position:fixed;right:0;top:0;z-index:200}.side-menu{background:var(--bg-secondary);bottom:0;left:0;max-width:300px;overflow-y:auto;position:absolute;top:0;width:80%}.side-menu-header{align-items:center;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;padding:16px}.side-menu-header button{background:none;border:none;color:var(--text-tertiary);cursor:pointer;font-size:24px}.side-menu-section{padding:16px}.section-label{color:var(--text-tertiary);font-size:12px;margin-bottom:8px;text-transform:uppercase}.chat-item.active{background:var(--bg-card)}.chat-name{color:var(--text-secondary);font-size:14px}.chat-item.active .chat-name{color:var(--text-primary)}.chat-close{background:none;border:none;color:var(--text-tertiary);cursor:pointer;font-size:14px;opacity:0}.chat-item:hover .chat-close{opacity:1}.new-chat-btn{background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;font-size:14px;margin-top:8px;padding:10px;width:100%}.new-chat-input{display:flex;gap:8px;margin-top:8px}.new-chat-input input{flex:1;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;padding:8px;outline:none}.new-chat-input button{background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;padding:8px 12px}.auth-buttons{display:flex;flex-direction:column;gap:8px}.auth-buttons button{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;font-size:14px;padding:10px;width:100%}.auth-buttons button.primary{background:var(--accent);border-color:var(--accent)}.user-info{background:var(--bg-card);border-radius:var(--radius-sm);display:flex;flex-direction:column;gap:4px;padding:12px}.token-info{color:var(--accent);font-size:13px}.token-balance{display:flex;align-items:center;gap:6px;padding:6px 12px;background:var(--bg-elevated);border-radius:var(--radius-lg);font-size:13px;border:1px solid var(--border)}.token-balance.anonymous{border-color:#ffcc004d}.token-balance.logged-in{border-color:#00ff884d}.token-icon{font-size:12px;color:var(--accent)}.token-count{font-weight:600;color:var(--text-primary)}.token-label{color:var(--text-tertiary)}.free-tokens-btn{background:linear-gradient(135deg,#00c853,#00e676);border:none;border-radius:12px;color:#fff;cursor:pointer;font-size:11px;font-weight:700;margin-left:8px;padding:4px 10px}.chat-area{flex:1;overflow-y:auto;padding:20px}.messages{display:flex;flex-direction:column;gap:16px;max-width:800px;margin:0 auto}.message{display:flex;gap:12px;max-width:85%}.message.user{align-self:flex-end;flex-direction:row-reverse}.message.assistant{align-self:flex-start}.message-avatar{font-size:20px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--bg-elevated);border-radius:50%;flex-shrink:0}.message.user .message-avatar{background:var(--accent)}.message.assistant .message-avatar{background:linear-gradient(135deg,#667eea,#764ba2)}.message-content{background:var(--bg-card);padding:12px 16px;border-radius:var(--radius-md);line-height:1.6;font-size:15px;border:1px solid var(--border)}.message.user .message-content{background:var(--accent);color:#fff;border-color:var(--accent)}.message-content code{background:#0000004d;border-radius:4px;font-family:Fira Code,monospace;font-size:13px;padding:2px 6px}.message-content pre{background:#0006;border-radius:8px;margin:8px 0;overflow-x:auto;padding:12px}.message-content pre code{background:none;padding:0}.message-content h1,.message-content h2,.message-content h3{margin:8px 0}.message-content p{margin:4px 0}.message-content ul,.message-content ol{margin:4px 0;padding-left:20px}.empty-state{align-items:center;display:flex;flex-direction:column;justify-content:center;height:100%;text-align:center;color:var(--text-secondary);gap:12px}.empty-icon{font-size:48px;opacity:.5}.empty-state h2{font-size:24px;font-weight:600;color:var(--text-primary)}.empty-state p{color:var(--text-tertiary)}.typing-indicator{display:inline-flex;gap:4px}.typing-indicator span{animation:bounce 1.4s infinite ease-in-out both;background:var(--text-tertiary);border-radius:50%;height:8px;width:8px}.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)}}.chat-input-form{display:flex;gap:12px;padding:16px 20px;background:var(--bg-secondary);border-top:1px solid var(--border);flex-shrink:0}.chat-input{flex:1;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text-primary);font-size:15px;padding:12px 16px;outline:none;transition:border-color .2s}.chat-input:focus{border-color:var(--accent)}.chat-input::placeholder{color:var(--text-tertiary)}.send-btn{background:var(--accent);border:none;border-radius:50%;color:#fff;cursor:pointer;padding:10px;transition:background .2s;width:44px;height:44px}.send-btn:hover:not(:disabled){background:var(--accent-hover)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.modal-overlay{background:#000000d9;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:300;align-items:center}.menu-modal{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);height:90%;max-width:400px;overflow-y:auto;width:95%}.menu-header{align-items:center;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;padding:16px 20px}.menu-header h2{margin:0;font-size:18px}.menu-header .close-btn{background:none;border:none;color:var(--text-tertiary);cursor:pointer;font-size:24px}.menu-section{padding:16px 20px;border-bottom:1px solid var(--border)}.menu-section:last-child{border-bottom:none}.section-label{color:var(--text-tertiary);font-size:12px;margin-bottom:12px;text-transform:uppercase}.menu-btn-primary{background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;font-size:15px;padding:12px 16px;width:100%;display:flex;align-items:center;justify-content:center;gap:8px}.menu-btn-secondary{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;font-size:15px;padding:12px 16px;width:100%}.menu-btn-danger{background:#f44;border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;font-size:15px;padding:12px 16px;width:100%}.chat-list{display:flex;flex-direction:column;gap:4px}.chat-item{align-items:center;border-radius:var(--radius-sm);cursor:pointer;display:flex;justify-content:space-between;padding:10px 12px}.chat-item:hover{background:var(--bg-elevated)}.chat-item.active{background:var(--bg-elevated);border:1px solid var(--accent)}.chat-name{color:var(--text-primary);font-size:14px;flex:1}.chat-actions{display:flex;gap:4px;opacity:0}.chat-item:hover .chat-actions{opacity:1}.chat-actions button{background:none;border:none;cursor:pointer;font-size:12px;padding:4px}.edit-chat{display:flex;gap:8px;width:100%}.edit-chat input{flex:1;background:var(--bg-secondary);border:1px solid var(--accent);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;padding:6px 10px;outline:none}.edit-chat button{background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;padding:6px 10px}.auth-section{display:flex;flex-direction:column;gap:8px}.account-section{display:flex;flex-direction:column;gap:12px}.account-info{align-items:center;background:var(--bg-elevated);border-radius:var(--radius-sm);display:flex;justify-content:space-between;padding:12px}.token-display{color:var(--accent);font-weight:600}.modal .modal-close{background:none;border:none;color:var(--text-tertiary);cursor:pointer;font-size:20px;position:absolute;right:16px;top:12px}.modal .modal h2{margin-bottom:16px;text-align:center}.modal .auth-tabs{display:flex;gap:8px;margin-bottom:16px}.modal .auth-tabs button{flex:1;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;padding:8px}.modal .auth-tabs button.active{background:var(--accent);border-color:var(--accent);color:#fff}.modal .modal form{display:flex;flex-direction:column;gap:12px}.modal .modal input{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;padding:12px;outline:none;width:100%}.modal .modal input:focus{border-color:var(--accent)}.modal .modal .error{color:#f44;font-size:13px;text-align:center}.modal .modal button[type=submit]{background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;font-size:14px;font-weight:600;padding:12px;transition:background .2s}.modal .modal button[type=submit]:hover{background:var(--accent-hover)}