*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #0a0a0f;--bg2: #12121a;--bg3: #1a1a2e;--border: #2a2a3e;--text: #e0e0e0;--text2: #8888aa;--accent: #6366f1;--accent2: #818cf8;--user-bg: #312e81;--assistant-bg: #1e1e32;--danger: #ef4444;--radius: 12px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}#root{height:100vh}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;background:var(--bg)}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.spinner-sm{display:inline-block;width:14px;height:14px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg);padding:20px}.login-card{width:100%;max-width:420px;background:var(--bg2);border:1px solid var(--border);border-radius:16px;padding:40px 32px}.login-header{text-align:center;margin-bottom:32px}.login-header .logo{font-size:48px;margin-bottom:8px}.login-header h1{font-size:24px;font-weight:700}.subtitle{color:var(--text2);font-size:14px;margin-top:4px}.tabs{display:flex;margin-bottom:24px;border-bottom:1px solid var(--border)}.tab{flex:1;padding:10px;text-align:center;background:none;border:none;color:var(--text2);font-size:14px;cursor:pointer;border-bottom:2px solid transparent;transition:all .2s}.tab.active{color:var(--accent2);border-bottom-color:var(--accent)}.tab:hover{color:var(--text)}.field{margin-bottom:16px}.field label{display:block;font-size:13px;color:var(--text2);margin-bottom:6px}.field input{width:100%;padding:10px 14px;background:var(--bg3);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:14px;outline:none;transition:border-color .2s}.field input:focus{border-color:var(--accent)}.field input::placeholder{color:var(--text2);opacity:.5}.error-msg{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:var(--danger);padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:16px}.btn-primary{width:100%;padding:12px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background:var(--accent2)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.footer-text{text-align:center;font-size:11px;color:var(--text2);margin-top:24px;opacity:.5}.chat-layout{display:flex;height:100vh}.sidebar{width:260px;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.sidebar-header .logo{font-size:20px;font-weight:700;cursor:pointer;color:var(--text)}.sidebar-header .logo:hover{color:var(--accent2)}.btn-new-chat{width:32px;height:32px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:20px;font-weight:600;cursor:pointer;transition:background .2s;display:flex;align-items:center;justify-content:center}.btn-new-chat:hover{background:var(--accent2)}.processing-bar{display:flex;align-items:center;gap:10px;padding:10px 16px;background:#6366f114;border-bottom:1px solid rgba(99,102,241,.2);font-size:12px;color:var(--accent2)}.processing-dot{width:10px;height:10px;border-radius:50%;background:#22d3ee;box-shadow:0 0 8px #22d3ee,0 0 16px #22d3ee66;animation:pulse-dot 1.2s ease-in-out infinite;flex-shrink:0}@keyframes pulse-dot{0%,to{opacity:1;box-shadow:0 0 8px #22d3ee,0 0 16px #22d3ee66}50%{opacity:.4;box-shadow:0 0 4px #22d3ee,0 0 8px #22d3ee33}}.processing-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.session-list{flex:1;overflow-y:auto;padding:8px}.session-item{display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:8px;cursor:pointer;transition:background .2s;margin-bottom:2px}.session-item:hover{background:var(--bg3)}.session-item.active{background:var(--bg3);border-left:3px solid var(--accent)}.session-title{flex:1;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.session-title:hover{color:var(--accent2)}.rename-input{flex:1;padding:4px 8px;background:var(--bg);border:1px solid var(--accent);border-radius:4px;color:var(--text);font-size:13px;font-family:inherit;outline:none}.btn-delete-session{background:none;border:none;color:var(--text2);font-size:18px;cursor:pointer;opacity:0;transition:opacity .2s;padding:0 4px;line-height:1}.session-item:hover .btn-delete-session{opacity:1}.btn-delete-session:hover{color:var(--danger)}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border)}.btn-logout{width:100%;padding:8px;background:none;border:1px solid var(--border);border-radius:8px;color:var(--text2);font-size:13px;cursor:pointer;transition:all .2s}.btn-logout:hover{background:var(--bg3);color:var(--danger);border-color:var(--danger)}.chat-main{flex:1;display:flex;flex-direction:column;background:var(--bg);min-width:0}.messages{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px}.message{display:flex;gap:10px;max-width:80%}.message.message-user{align-self:flex-end;flex-direction:row-reverse}.message.message-assistant{align-self:flex-start}.message.message-system{align-self:center;max-width:100%}.message-avatar{font-size:24px;flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--bg3);border-radius:50%}.message-content{display:flex;flex-direction:column;gap:4px}.message-text{white-space:pre-wrap;word-break:break-word;line-height:1.5;font-size:14px;padding:12px 16px;border-radius:var(--radius)}.message.message-user .message-text{background:var(--user-bg);border-bottom-right-radius:4px}.message.message-assistant 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.2s}.chat-input:focus{border-color:var(--accent)}.chat-input::placeholder{color:var(--text2);opacity:.5}.chat-input:disabled{opacity:.5;cursor:not-allowed}.btn-send,.btn-cancel{width:42px;height:42px;border:none;border-radius:10px;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0}.btn-send{background:var(--accent);color:#fff}.btn-send:hover{background:var(--accent2)}.btn-send:disabled{opacity:.4;cursor:not-allowed}.btn-cancel{background:var(--danger);color:#fff;font-size:16px}.btn-cancel:hover{background:#dc2626}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:12px}.empty-icon{font-size:64px}.empty-state h2{font-size:24px;font-weight:700}.empty-state p{color:var(--text2);max-width:400px}