:root{--primary-color: #6366f1;--primary-hover: #4f46e5;--bg-color: #0f172a;--surface-color: #1e293b;--surface-hover: #334155;--text-color: #f8fafc;--text-secondary: #94a3b8;--border-color: #334155;--user-bubble: #6366f1;--assistant-bubble: #1e293b;--error-color: #ef4444;--success-color: #22c55e}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-color);color:var(--text-color);direction:rtl}.app{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}.chat-container{width:100%;max-width:900px;height:90vh;background-color:var(--surface-color);border-radius:16px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 20px 60px #0000004d}.chat-header{padding:20px 24px;background:linear-gradient(135deg,var(--primary-color),#8b5cf6);text-align:center}.chat-header h1{font-size:24px;font-weight:700;margin-bottom:4px}.chat-header p{font-size:14px;opacity:.9}.messages-container{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px}.messages-container::-webkit-scrollbar{width:6px}.messages-container::-webkit-scrollbar-track{background:transparent}.messages-container::-webkit-scrollbar-thumb{background-color:var(--border-color);border-radius:3px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;color:var(--text-secondary)}.empty-icon{font-size:64px;margin-bottom:16px}.empty-state h2{font-size:24px;margin-bottom:8px;color:var(--text-color)}.message-bubble{display:flex;gap:12px;max-width:80%;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-bubble.user{align-self:flex-end;flex-direction:row-reverse}.message-bubble.assistant{align-self:flex-start}.message-avatar{width:40px;height:40px;border-radius:50%;background-color:var(--surface-hover);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.message-content{background-color:var(--user-bubble);padding:12px 16px;border-radius:16px 4px 16px 16px}.message-bubble.assistant .message-content{background-color:var(--assistant-bubble);border:1px solid var(--border-color);border-top-left-radius:4px;border-top-right-radius:16px}.message-role{font-size:12px;font-weight:600;margin-bottom:4px;opacity:.8}.message-text{font-size:15px;line-height:1.6;white-space:pre-wrap;word-break:break-word}.message-time{font-size:11px;opacity:.6;margin-top:8px;text-align:left}.typing-indicator{display:flex;gap:4px;padding:12px 16px;background-color:var(--assistant-bubble);border-radius:16px;align-self:flex-start;border:1px solid var(--border-color)}.typing-indicator span{width:8px;height:8px;background-color:var(--text-secondary);border-radius:50%;animation:bounce 1.4s infinite ease-in-out}.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)}}.error-message{background-color:#ef44441a;border:1px solid var(--error-color);color:var(--error-color);padding:12px 16px;border-radius:12px;text-align:center}.chat-input-container{padding:16px 20px;background-color:var(--surface-color);border-top:1px solid var(--border-color)}.chat-input-wrapper{display:flex;gap:12px;align-items:flex-end;background-color:var(--bg-color);border-radius:12px;padding:8px;border:1px solid var(--border-color);transition:border-color .2s}.chat-input-wrapper:focus-within{border-color:var(--primary-color)}.chat-input{flex:1;background:transparent;border:none;outline:none;color:var(--text-color);font-size:15px;padding:8px 12px;resize:none;max-height:200px;direction:rtl}.chat-input::placeholder{color:var(--text-secondary)}.send-button{width:44px;height:44px;border-radius:10px;background-color:var(--primary-color);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,transform .1s;flex-shrink:0}.send-button:hover:not(:disabled){background-color:var(--primary-hover);transform:scale(1.05)}.send-button:disabled{opacity:.5;cursor:not-allowed}.loading-spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.input-hint{text-align:center;font-size:12px;color:var(--text-secondary);margin-top:8px}@media (max-width: 768px){.app{padding:0}.chat-container{height:100vh;border-radius:0}.message-bubble{max-width:90%}}