:root{--bg-base:#0c0d14;--bg-surface:#12131f;--bg-elevated:#1a1b2e;--glass-bg:#ffffff0a;--glass-border:#ffffff14;--glass-hover:#ffffff12;--accent-cyan:#00d4ff;--accent-violet:#7c3aed;--accent-violet-light:#a78bfa;--gradient-primary:linear-gradient(135deg, #00d4ff, #7c3aed);--text-primary:#f0f0ff;--text-secondary:#88a;--text-muted:#55556a;--user-bubble-bg:linear-gradient(135deg, #00d4ff2e, #7c3aed2e);--ai-bubble-bg:#ffffff0a;--sidebar-width:260px;--border-radius:14px;--border-radius-sm:8px;--border-radius-lg:20px;--font:"Inter", system-ui, sans-serif;--shadow-glow:0 0 40px #00d4ff14;--shadow-card:0 8px 32px #0006}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}body{font-family:var(--font);background:var(--bg-base);color:var(--text-primary);font-size:14px;line-height:1.6}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea,select{color:inherit;background:0 0;border:none;outline:none;font-family:inherit}textarea{resize:none}.glass{background:var(--glass-bg);border:1px solid var(--glass-border);-webkit-backdrop-filter:blur(20px)}.hidden{display:none!important}.btn{border-radius:var(--border-radius-sm);align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 20px #00d4ff33}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 30px #00d4ff59}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-secondary)}.btn-secondary:hover{background:var(--glass-hover);color:var(--text-primary)}.btn-full{justify-content:center;width:100%}.btn-sm{padding:6px 14px;font-size:12px}.icon-btn{border-radius:var(--border-radius-sm);width:36px;height:36px;color:var(--text-secondary);justify-content:center;align-items:center;transition:all .2s;display:flex}.icon-btn:hover{background:var(--glass-hover);color:var(--text-primary)}.form-group{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.form-group label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:500}.form-group input,.form-group select,.form-group textarea{border:1px solid var(--glass-border);border-radius:var(--border-radius-sm);color:var(--text-primary);background:#ffffff0f;width:100%;padding:10px 14px;font-size:14px;transition:border-color .2s}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--accent-cyan);box-shadow:0 0 0 3px #00d4ff1a}.form-group input[type=range]{cursor:pointer;accent-color:var(--accent-cyan);background:0 0;border:none;padding:4px 0}.form-row{grid-template-columns:1fr 1fr;gap:12px;display:grid}.form-error{border-radius:var(--border-radius-sm);color:#fca5a5;background:#ef444426;border:1px solid #ef44444d;margin-bottom:14px;padding:10px 14px;font-size:13px}.form-success{border-radius:var(--border-radius-sm);color:#6ee7b7;background:#10b98126;border:1px solid #10b9814d;margin-bottom:14px;padding:10px 14px;font-size:13px}.range-val{color:var(--accent-cyan);margin-left:6px;font-weight:600}.auth-screen{background:var(--bg-base);justify-content:center;align-items:center;display:flex;position:fixed;inset:0;overflow:hidden}.auth-bg-grid{background-image:linear-gradient(#00d4ff0a 1px,#0000 1px),linear-gradient(90deg,#00d4ff0a 1px,#0000 1px);background-size:40px 40px;position:absolute;inset:0}.auth-orb{filter:blur(80px);pointer-events:none;border-radius:50%;position:absolute}.auth-orb-1{background:radial-gradient(circle,#00d4ff26,#0000 70%);width:500px;height:500px;animation:8s ease-in-out infinite orb-float;top:-100px;left:-150px}.auth-orb-2{background:radial-gradient(circle,#7c3aed33,#0000 70%);width:400px;height:400px;animation:10s ease-in-out infinite reverse orb-float;bottom:-80px;right:-100px}@keyframes orb-float{0%,to{transform:translateY(0)scale(1)}50%{transform:translateY(-30px)scale(1.05)}}.auth-container{z-index:1;flex-direction:column;align-items:center;gap:28px;width:100%;max-width:420px;padding:20px;display:flex;position:relative}.auth-logo{text-align:center}.auth-logo-icon{filter:drop-shadow(0 0 20px #00d4ff80);font-size:56px;animation:3s ease-in-out infinite pulse-glow}@keyframes pulse-glow{0%,to{filter:drop-shadow(0 0 20px #00d4ff66)}50%{filter:drop-shadow(0 0 40px #00d4ffcc)}}.auth-logo-title{background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-top:8px;font-size:28px;font-weight:700}.auth-logo-sub{color:var(--text-muted);margin-top:4px;font-size:13px}.auth-card{border-radius:var(--border-radius-lg);width:100%;box-shadow:var(--shadow-card), var(--shadow-glow);padding:28px}.auth-tabs{border-radius:var(--border-radius-sm);background:#ffffff0d;gap:4px;margin-bottom:24px;padding:4px;display:flex}.auth-tab{color:var(--text-secondary);border-radius:6px;flex:1;padding:8px 0;font-size:14px;font-weight:500;transition:all .2s}.auth-tab.active{background:var(--gradient-primary);color:#fff}.main-app{height:100vh;display:flex;overflow:hidden}.main-app.sidebar-open .sidebar{transform:translate(0)}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);border-right:1px solid var(--glass-border);border-radius:0;flex-direction:column;flex-shrink:0;gap:8px;height:100vh;padding:16px 12px;transition:transform .3s;display:flex;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--glass-border);align-items:center;gap:10px;margin-bottom:4px;padding:4px 4px 12px;display:flex}.logo-mark{font-size:28px}.logo-text{flex-direction:column;flex:1;gap:1px;display:flex}.logo-title{font-size:15px;font-weight:700}.logo-badge{color:var(--accent-cyan);text-transform:uppercase;letter-spacing:.08em;font-size:10px;font-weight:500}.sidebar-toggle-mobile{display:none}.new-chat-btn{justify-content:center;width:100%;margin:4px 0 8px;padding:10px 16px}.sidebar-section-label{text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-top:4px;padding:0 6px;font-size:10px;font-weight:600}.sessions-list{flex-direction:column;flex:1;gap:2px;display:flex;overflow-y:auto}.sessions-empty{color:var(--text-muted);text-align:center;padding:24px 8px;font-size:13px}.session-item{border-radius:var(--border-radius-sm);cursor:pointer;color:var(--text-secondary);white-space:nowrap;text-overflow:ellipsis;align-items:center;gap:8px;padding:10px;font-size:13px;transition:all .15s;display:flex;position:relative;overflow:hidden}.session-item:hover{background:var(--glass-hover);color:var(--text-primary)}.session-item.active{color:var(--accent-cyan);border-left:2px solid var(--accent-cyan);background:#00d4ff14}.session-item:before{content:"💬";flex-shrink:0;font-size:13px}.session-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.sidebar-footer{border-top:1px solid var(--glass-border);flex-direction:column;gap:4px;margin-top:auto;padding-top:12px;display:flex}.sidebar-footer-btn{border-radius:var(--border-radius-sm);color:var(--text-secondary);text-align:left;align-items:center;gap:10px;width:100%;padding:10px;font-size:13px;font-weight:500;transition:all .15s;display:flex}.sidebar-footer-btn:hover{background:var(--glass-hover);color:var(--text-primary)}.logout-btn:hover{color:#fca5a5!important}.chat-area{flex-direction:column;flex:1;display:flex;position:relative;overflow:hidden}.chat-topbar{border-bottom:1px solid var(--glass-border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#0c0d14cc;align-items:center;gap:12px;min-height:56px;padding:12px 20px;display:flex}.sidebar-toggle{display:none}.chat-title{color:var(--text-primary);font-size:15px;font-weight:600}.chat-welcome{text-align:center;color:var(--text-secondary);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:16px;padding:40px;display:flex}.welcome-icon{filter:drop-shadow(0 0 20px #00d4ff4d);font-size:64px}.chat-welcome h2{color:var(--text-primary);font-size:24px;font-weight:600}.chat-welcome p{max-width:300px;font-size:14px}.messages-container{scroll-behavior:smooth;flex-direction:column;flex:1;gap:20px;padding:24px 20px;display:flex;overflow-y:auto}.messages-container::-webkit-scrollbar{width:4px}.messages-container::-webkit-scrollbar-track{background:0 0}.messages-container::-webkit-scrollbar-thumb{background:var(--glass-border);border-radius:4px}.message{gap:12px;width:100%;max-width:820px;display:flex}.message.user{flex-direction:row-reverse;margin-left:auto}.message.assistant{margin-right:auto}.message-avatar{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;margin-top:2px;font-size:16px;display:flex}.message.user .message-avatar{background:var(--gradient-primary);color:#fff;font-size:13px}.message.assistant .message-avatar{background:#7c3aed33;border:1px solid #7c3aed4d}.message-bubble{word-wrap:break-word;overflow-wrap:break-word;border-radius:16px;width:fit-content;max-width:calc(100% - 50px);padding:14px 18px;font-size:14px;line-height:1.7;position:relative}.message.user .message-bubble{background:var(--user-bubble-bg);color:var(--text-primary);border:1px solid #00d4ff26;border-top-right-radius:4px}.message.assistant .message-bubble{background:var(--ai-bubble-bg);border:1px solid var(--glass-border);color:var(--text-primary);border-top-left-radius:4px}.message-bubble pre{border:1px solid var(--glass-border);background:#0000004d;border-radius:8px;margin:10px 0;padding:12px;font-family:Courier New,monospace;font-size:13px;overflow-x:auto}.message-bubble code{color:var(--accent-cyan);background:#0003;border-radius:4px;padding:2px 6px;font-family:Courier New,monospace;font-size:12px}.message-bubble pre code{color:inherit;background:0 0;padding:0}.message-time{color:var(--text-muted);text-align:right;margin-top:6px;font-size:10px}.message.user .message-time{text-align:right}.typing-indicator{color:var(--text-muted);align-items:center;gap:8px;padding:12px 20px 0;font-size:12px;display:flex}.typing-dot{background:var(--accent-cyan);border-radius:50%;width:6px;height:6px;animation:1.4s infinite typing-bounce}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing-bounce{0%,80%,to{opacity:.4;transform:translateY(0)}40%{opacity:1;transform:translateY(-6px)}}.chat-input-area{padding:16px 20px 20px}.chat-input-wrapper{border-radius:var(--border-radius);align-items:flex-end;gap:12px;padding:12px 14px;transition:border-color .2s;display:flex}.chat-input-wrapper:focus-within{border-color:#00d4ff66;box-shadow:0 0 0 3px #00d4ff0f}.chat-input{color:var(--text-primary);background:0 0;flex:1;max-height:200px;font-size:14px;line-height:1.6;overflow-y:auto}.chat-input::placeholder{color:var(--text-muted)}.send-btn{background:var(--gradient-primary);color:#fff;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;transition:all .2s;display:flex;box-shadow:0 2px 12px #00d4ff40}.send-btn:hover{transform:scale(1.05);box-shadow:0 4px 20px #00d4ff66}.send-btn:active{transform:scale(.97)}.send-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.chat-input-hint{color:var(--text-muted);text-align:center;margin-top:8px;font-size:11px}.modal-overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:100;background:#000000b3;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal{border-radius:var(--border-radius-lg);flex-direction:column;width:100%;max-width:600px;max-height:85vh;display:flex;overflow:hidden}.modal-header{border-bottom:1px solid var(--glass-border);justify-content:space-between;align-items:center;padding:20px 24px 16px;display:flex}.modal-header h2{font-size:18px;font-weight:600}.modal-tabs{gap:4px;padding:12px 24px 0;display:flex}.modal-tab{color:var(--text-secondary);border-bottom:2px solid #0000;border-radius:8px 8px 0 0;padding:8px 16px;font-size:13px;font-weight:500;transition:all .2s}.modal-tab.active{color:var(--accent-cyan);border-bottom-color:var(--accent-cyan)}.modal-tab:hover{color:var(--text-primary)}.admin-tab-content{flex:1;padding:24px;overflow-y:auto}.admin-section{flex-direction:column;gap:0;display:flex}.kb-dropzone{border:2px dashed var(--glass-border);border-radius:var(--border-radius);text-align:center;cursor:pointer;padding:48px 24px;transition:all .2s}.kb-dropzone:hover,.kb-dropzone.dragover{border-color:var(--accent-cyan);background:#00d4ff0a}.kb-dropzone-icon{margin-bottom:12px;font-size:48px}.kb-dropzone-title{color:var(--text-primary);font-size:16px;font-weight:600}.kb-dropzone-sub{color:var(--text-muted);margin-top:4px;font-size:13px}.progress-bar{background:var(--glass-bg);border-radius:6px;height:6px;margin-top:16px;overflow:hidden}.progress-fill{background:var(--gradient-primary);border-radius:6px;height:100%;transition:width .3s}.admin-users-list{flex-direction:column;gap:12px;display:flex}.admin-user-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--border-radius-sm);padding:14px 16px}.admin-user-email{align-items:center;gap:8px;margin-bottom:6px;font-weight:600;display:flex}.badge{text-transform:uppercase;border-radius:20px;padding:2px 8px;font-size:10px;font-weight:600}.badge-admin{color:var(--accent-cyan);background:#00d4ff26}.badge-inactive{color:#fca5a5;background:#ef444426}.admin-session-list{color:var(--text-muted);flex-direction:column;gap:2px;margin-top:6px;font-size:12px;display:flex}.admin-session-item{padding:2px 0}.loading-spinner-small{border:2px solid var(--glass-border);border-top-color:var(--accent-cyan);border-radius:50%;width:24px;height:24px;margin:24px auto;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=768px){.sidebar{z-index:50;height:100vh;box-shadow:var(--shadow-card);position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-toggle-mobile,.sidebar-toggle{display:flex}.form-row{grid-template-columns:1fr}}