:root{--primary: #6366f1;--primary-dark: #4f46e5;--bg-dark: #0f172a;--bg-card: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--border: #334155;--success: #22c55e;--error: #ef4444}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg-dark);color:var(--text-primary);min-height:100vh}.app{max-width:800px;margin:0 auto;padding:2rem 1rem;min-height:100vh;display:flex;flex-direction:column}header{text-align:center;margin-bottom:2rem}header h1{font-size:2rem;font-weight:700;background:linear-gradient(135deg,var(--primary),#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}header p{color:var(--text-secondary);font-size:.9rem}header .subtitle{display:block;color:var(--text-secondary);font-size:.75rem;margin-top:.25rem;opacity:.8;text-decoration:none;transition:all .2s}header a.subtitle:hover{color:var(--primary);opacity:1}.status{display:inline-flex;align-items:center;gap:.5rem;margin-top:.5rem;font-size:.8rem;color:var(--success)}.status-dot{width:8px;height:8px;background:var(--success);border-radius:50%;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.login-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem}.login-btn{background:var(--primary);color:#fff;border:none;padding:1rem 2rem;font-size:1rem;border-radius:12px;cursor:pointer;transition:all .2s;font-weight:500}.login-btn:hover{background:var(--primary-dark);transform:translateY(-2px)}.chat-container{flex:1;display:flex;flex-direction:column;background:var(--bg-card);border-radius:16px;border:1px solid var(--border);overflow:hidden}.chat-header{padding:1rem;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.chat-header h2{font-size:1rem;font-weight:600}.clear-btn{background:transparent;color:var(--text-secondary);border:1px solid var(--border);padding:.5rem 1rem;font-size:.8rem;border-radius:8px;cursor:pointer;transition:all .2s}.clear-btn:hover{color:var(--error);border-color:var(--error)}.header-buttons{display:flex;gap:.5rem}.logout-btn{background:transparent;color:var(--text-secondary);border:1px solid var(--border);padding:.5rem 1rem;font-size:.8rem;border-radius:8px;cursor:pointer;transition:all .2s}.logout-btn:hover{color:var(--text-primary);border-color:var(--text-primary)}.messages{flex:1;padding:1rem;overflow-y:auto;display:flex;flex-direction:column;gap:1rem;min-height:400px;max-height:500px}.message{max-width:80%;padding:.75rem 1rem;border-radius:12px;line-height:1.5}.message.user{background:var(--primary);align-self:flex-end;border-bottom-right-radius:4px}.message.assistant{background:var(--bg-dark);align-self:flex-start;border-bottom-left-radius:4px}.message strong{display:block;font-size:.75rem;margin-bottom:.25rem;opacity:.7}.message p{white-space:pre-wrap;word-break:break-word}.loading{align-self:flex-start;color:var(--text-secondary);font-style:italic;display:flex;align-items:center;gap:.5rem}.loading-dots{display:flex;gap:4px}.loading-dots span{width:6px;height:6px;background:var(--text-secondary);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.loading-dots span:nth-child(1){animation-delay:-.32s}.loading-dots span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.input-area{padding:1rem;border-top:1px solid var(--border);display:flex;gap:.75rem}.input-area input{flex:1;background:var(--bg-dark);border:1px solid var(--border);color:var(--text-primary);padding:.75rem 1rem;font-size:1rem;border-radius:12px;outline:none;transition:border-color .2s}.input-area input:focus{border-color:var(--primary)}.input-area input::placeholder{color:var(--text-secondary)}.input-area button{background:var(--primary);color:#fff;border:none;padding:.75rem 1.5rem;font-size:1rem;border-radius:12px;cursor:pointer;transition:all .2s;font-weight:500}.input-area button:hover:not(:disabled){background:var(--primary-dark)}.input-area button:disabled{opacity:.5;cursor:not-allowed}.error{color:var(--error);text-align:center;padding:1rem;font-size:.9rem}.welcome{text-align:center;color:var(--text-secondary);padding:2rem}.welcome h3{color:var(--text-primary);margin-bottom:.5rem}@media(max-width:600px){.app{padding:1rem .5rem}header h1{font-size:1.5rem}.message{max-width:90%}}