*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#0f0f0f;color:#e0e0e0;height:100vh}#root{height:100vh}.loading{display:flex;align-items:center;justify-content:center;height:100vh;font-size:1.2rem;color:#888}.auth-container{display:flex;align-items:center;justify-content:center;height:100vh;background:linear-gradient(135deg,#0f0f0f,#1a1a2e)}.auth-card{background:#1e1e1e;border-radius:12px;padding:2.5rem;width:100%;max-width:400px;box-shadow:0 8px 32px #0006}.auth-card h1{text-align:center;margin-bottom:1.5rem;font-size:1.8rem}.auth-card form{display:flex;flex-direction:column;gap:.8rem}.auth-card input{padding:.75rem;border-radius:8px;border:1px solid #333;background:#2a2a2a;color:#e0e0e0;font-size:1rem}.auth-card input:focus{outline:none;border-color:#4a9eff}.auth-card button{padding:.75rem;border-radius:8px;border:none;background:#4a9eff;color:#fff;font-size:1rem;cursor:pointer;font-weight:600;margin-top:.5rem}.auth-card button:hover{background:#3a8eef}.switch-auth{text-align:center;margin-top:1rem;color:#888}.switch-auth a{color:#4a9eff;text-decoration:none}.error{background:#f44;color:#fff;padding:.6rem;border-radius:8px;text-align:center;margin-bottom:.5rem;font-size:.9rem}.chat-layout{display:flex;height:100vh}.sidebar{width:260px;background:#171717;border-right:1px solid #2a2a2a;display:flex;flex-direction:column;padding:.75rem}.new-chat-btn{padding:.7rem;border-radius:8px;border:1px solid #333;background:transparent;color:#e0e0e0;cursor:pointer;font-size:.95rem;margin-bottom:.75rem}.new-chat-btn:hover{background:#2a2a2a}.conversations{flex:1;overflow-y:auto}.conv-item{display:flex;align-items:center;padding:.6rem .75rem;border-radius:8px;cursor:pointer;margin-bottom:2px}.conv-item:hover,.conv-item.active{background:#2a2a2a}.conv-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.85rem}.delete-btn{background:none;border:none;color:#666;cursor:pointer;font-size:1.1rem;padding:0 .3rem;visibility:hidden}.conv-item:hover .delete-btn{visibility:visible}.delete-btn:hover{color:#f44}.sidebar-footer{padding-top:.75rem;border-top:1px solid #2a2a2a}.signout-btn{width:100%;padding:.6rem;border-radius:8px;border:none;background:#2a2a2a;color:#aaa;cursor:pointer;font-size:.9rem}.signout-btn:hover{background:#333;color:#e0e0e0}.chat-main{flex:1;display:flex;flex-direction:column}.chat-header{padding:.75rem 1rem;border-bottom:1px solid #2a2a2a;display:flex;align-items:center}.chat-header select{padding:.5rem .75rem;border-radius:8px;border:1px solid #333;background:#2a2a2a;color:#e0e0e0;font-size:.9rem}.messages{flex:1;overflow-y:auto;padding:1rem}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:#666}.empty-state h2{font-size:2rem;margin-bottom:.5rem}.message{display:flex;margin-bottom:1rem}.message.user{justify-content:flex-end}.message-content{max-width:70%;padding:.8rem 1rem;border-radius:12px;line-height:1.5;font-size:.95rem}.message.user .message-content{background:#4a9eff;color:#fff}.message.assistant .message-content{background:#2a2a2a}.message-content pre{background:#1a1a1a;padding:.75rem;border-radius:8px;overflow-x:auto;margin:.5rem 0}.message-content code{font-family:SF Mono,monospace;font-size:.85rem}.typing{color:#888;font-style:italic}.input-area{padding:.75rem 1rem;border-top:1px solid #2a2a2a;display:flex;gap:.5rem}.input-area textarea{flex:1;padding:.75rem;border-radius:8px;border:1px solid #333;background:#2a2a2a;color:#e0e0e0;font-size:1rem;resize:none;font-family:inherit}.input-area textarea:focus{outline:none;border-color:#4a9eff}.input-area button{padding:.75rem 1.5rem;border-radius:8px;border:none;background:#4a9eff;color:#fff;cursor:pointer;font-weight:600}.input-area button:disabled{opacity:.5;cursor:not-allowed}.input-area button:hover:not(:disabled){background:#3a8eef}