:root{--bg:#0a0a0a;--surface:#111;--surface-hover:#1a1a1a;--border:#1a1a1a;--border-light:#2a2a2a;--accent:#f59e0b;--accent-hover:#d97706;--text:#e0e0e0;--text-secondary:#888;--text-muted:#555;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);height:100vh;overflow:hidden}#root{height:100vh}input,textarea,button{font-family:var(--font)}.login-page{background:var(--bg);justify-content:center;align-items:center;height:100vh;display:flex}.login-card{text-align:center;width:380px}.login-brand{justify-content:center;align-items:center;gap:12px;margin-bottom:8px;display:flex}.pi-logo{background:var(--accent);width:40px;height:40px;color:var(--bg);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;font-size:18px;font-weight:700;display:flex}.brand-name{font-size:22px;font-weight:700}.login-subtitle{color:var(--text-secondary);margin-bottom:36px;font-size:14px}.login-form{background:var(--surface);border:1px solid var(--border);text-align:left;border-radius:12px;padding:32px}.login-form h3{text-align:center;margin-bottom:24px;font-size:16px;font-weight:500}.login-form label{color:var(--text-secondary);margin-bottom:16px;font-size:12px;display:block}.login-form input{background:var(--bg);border:1px solid var(--border-light);width:100%;color:var(--text);border-radius:8px;outline:none;margin-top:6px;padding:11px 14px;font-size:14px;display:block}.login-form input:focus{border-color:var(--accent)}.login-form button{background:var(--accent);width:100%;color:var(--bg);cursor:pointer;border:none;border-radius:8px;padding:12px;font-size:15px;font-weight:600}.login-form button:hover{background:var(--accent-hover)}.login-form button:disabled{opacity:.6;cursor:not-allowed}.login-error{color:#f87171;text-align:center;margin-bottom:12px;font-size:13px}.login-footer{color:var(--text-muted);margin-top:20px;font-size:12px}.app-shell{flex-direction:column;height:100vh;display:flex}.top-bar{border-bottom:1px solid var(--border);background:#0f0f0f;flex-shrink:0;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.top-bar-left{align-items:center;gap:10px;display:flex}.top-bar-left .pi-logo{border-radius:6px;width:28px;height:28px;font-size:14px}.top-bar-left .brand-name{font-size:15px;font-weight:600}.brand-subtitle{color:var(--text-secondary);font-size:13px}.top-bar-right{align-items:center;gap:12px;display:flex}.user-email{color:var(--text-secondary);font-size:13px}.avatar-btn{background:var(--border);border:1px solid var(--border-light);width:30px;height:30px;color:var(--text-secondary);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;font-size:12px;display:flex}.avatar-btn:hover{border-color:var(--accent);color:var(--accent)}.app-body{flex:1;display:flex;overflow:hidden}.sidebar{background:var(--bg);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:260px;display:flex}.sidebar-top{padding:16px}.new-chat-btn{background:var(--accent);width:100%;color:var(--bg);cursor:pointer;border:none;border-radius:8px;margin-bottom:12px;padding:10px 16px;font-size:14px;font-weight:600}.new-chat-btn:hover{background:var(--accent-hover)}.sidebar-search{border:1px solid var(--border-light);width:100%;color:var(--text);background:#141414;border-radius:6px;outline:none;padding:8px 12px;font-size:13px}.sidebar-search:focus{border-color:var(--accent)}.sidebar-list{flex:1;padding:0 8px;overflow-y:auto}.sidebar-group-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:8px 8px 4px;font-size:11px}.sidebar-item{cursor:pointer;border-radius:8px;margin-bottom:2px;padding:10px 12px}.sidebar-item:hover,.sidebar-item.active{background:var(--surface-hover)}.sidebar-item-title{color:#999;white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.sidebar-item.active .sidebar-item-title{color:var(--text);font-weight:500}.sidebar-item-time{color:var(--text-muted);margin-top:3px;font-size:11px}.chat-area{background:#0f0f0f;flex-direction:column;flex:1;display:flex;overflow:hidden}.chat-view{flex-direction:column;height:100%;display:flex}.chat-messages{flex:1;padding:24px;overflow-y:auto}.chat-empty{flex-direction:column;justify-content:center;align-items:center;gap:12px;height:100%;display:flex}.chat-empty .chat-empty-logo{background:var(--accent);width:48px;height:48px;color:var(--bg);border-radius:12px;justify-content:center;align-items:center;font-size:20px;font-weight:700;display:flex}.chat-empty h2{font-size:18px;font-weight:600}.chat-empty p{color:var(--text-muted);font-size:14px}.msg{margin-bottom:20px}.msg-user{justify-content:flex-end;display:flex}.msg-user-wrapper{flex-direction:column;align-items:flex-end;display:flex}.msg-time{color:var(--text-muted);margin-top:4px;font-size:11px}.msg-time-right{text-align:right}.msg-bubble{background:var(--surface-hover);border:1px solid var(--border-light);white-space:pre-wrap;border-radius:12px 12px 4px;max-width:70%;padding:12px 16px;font-size:14px;line-height:1.5}.msg-assistant{align-items:flex-start;gap:10px;display:flex}.msg-avatar{background:var(--accent);width:28px;height:28px;color:var(--bg);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;margin-top:2px;font-size:12px;font-weight:700;display:flex}.msg-body{flex:1;min-width:0}.msg-content{font-size:14px;line-height:1.6}.msg-content p{margin-bottom:8px}.msg-content p:last-child{margin-bottom:0}.msg-content ul,.msg-content ol{margin-bottom:8px;padding-left:20px}.msg-content li{margin-bottom:4px}.msg-content strong{color:var(--accent)}.msg-content code{background:var(--surface-hover);border-radius:4px;padding:2px 6px;font-size:13px}.msg-content pre{background:var(--surface);border-radius:8px;margin-bottom:8px;padding:12px;overflow-x:auto}.typing-dots{color:var(--accent);letter-spacing:2px;margin-left:4px;font-size:12px;animation:1s infinite pulse}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.sources-list{margin-top:12px}.sources-toggle{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;align-items:center;gap:4px;padding:0;font-size:12px;display:flex}.sources-toggle:hover{color:var(--text)}.sources-arrow{color:var(--text-muted);font-size:10px}.sources-items{flex-wrap:wrap;gap:4px;margin-top:8px;display:flex}.source-tag{color:var(--text-secondary);background:#1a1a1a;border-radius:4px;padding:4px 8px;font-size:11px}.feedback-buttons{flex-wrap:wrap;align-items:center;gap:6px;margin-top:8px;display:flex}.fb-btn{border:1px solid var(--border-light);cursor:pointer;background:0 0;border-radius:6px;justify-content:center;align-items:center;width:28px;height:28px;font-size:13px;display:flex}.fb-btn:hover{border-color:var(--text-muted)}.fb-btn.selected{border-color:var(--accent)}.fb-btn:disabled{cursor:default}.feedback-done{color:var(--text-muted);font-size:12px}.feedback-comment-box{flex:1;gap:6px;display:flex}.feedback-comment-box input{background:var(--bg);border:1px solid var(--border-light);color:var(--text);border-radius:6px;outline:none;flex:1;padding:6px 10px;font-size:12px}.feedback-comment-box input:focus{border-color:var(--accent)}.feedback-submit-btn{background:var(--accent);color:var(--bg);cursor:pointer;border:none;border-radius:6px;padding:6px 12px;font-size:12px;font-weight:600}.chat-input{border-top:1px solid var(--border);padding:16px 24px 24px}.chat-input-box{border:1px solid var(--border-light);background:#141414;border-radius:12px;align-items:flex-end;gap:12px;padding:12px 16px;display:flex}.chat-input-box textarea{color:var(--text);resize:none;background:0 0;border:none;outline:none;flex:1;max-height:150px;font-size:14px;line-height:1.4}.chat-input-box textarea::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent);width:36px;height:36px;color:var(--bg);cursor:pointer;border:none;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:16px;display:flex}.send-btn:hover{background:var(--accent-hover)}.send-btn:disabled{background:var(--border-light);cursor:not-allowed}@media (width<=768px){.sidebar{display:none}.chat-messages{padding:16px}.chat-input{padding:12px 16px 16px}.msg-bubble{max-width:90%}}