:root{--bg-primary: #0a0a1a;--bg-secondary: #12122a;--bg-card: rgba(255, 255, 255, .04);--bg-card-hover: rgba(255, 255, 255, .07);--bg-glass: rgba(255, 255, 255, .06);--bg-input: rgba(255, 255, 255, .08);--text-primary: #e8e8f0;--text-secondary: #8888aa;--text-muted: #5a5a78;--accent: #6c5ce7;--accent-hover: #7d6ff0;--accent-glow: rgba(108, 92, 231, .3);--accent-soft: rgba(108, 92, 231, .15);--success: #00b894;--warning: #fdcb6e;--danger: #e17055;--border: rgba(255, 255, 255, .08);--border-light: rgba(255, 255, 255, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px var(--accent-glow);--font: "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--transition: .2s cubic-bezier(.4, 0, .2, 1);--nav-height: 64px;--header-height: 56px;--max-width: 720px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:var(--font);font-size:15px;line-height:1.5;color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}#app{height:100%;display:flex;flex-direction:column}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:var(--radius-full)}.page{flex:1;display:flex;flex-direction:column;overflow:hidden;padding-bottom:var(--nav-height);animation:fadeIn .3s ease}.page-header{height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--border);background:var(--bg-secondary);flex-shrink:0}.page-header h1{font-size:18px;font-weight:600;background:linear-gradient(135deg,var(--text-primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-content{flex:1;overflow-y:auto;padding:16px 20px}.page-scroll{max-width:var(--max-width);margin:0 auto;width:100%}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:.4}50%{opacity:1}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:var(--nav-height);display:flex;align-items:center;justify-content:space-around;background:var(--bg-secondary);border-top:1px solid var(--border);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:100}.nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 16px;color:var(--text-muted);text-decoration:none;font-size:11px;font-weight:500;transition:color var(--transition);cursor:pointer;border:none;background:none}.nav-item:hover,.nav-item.active{color:var(--accent)}.nav-item .icon{font-size:22px;height:24px;display:flex;align-items:center}.nav-item.active .icon{filter:drop-shadow(0 0 6px var(--accent-glow))}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;font-family:var(--font);font-size:14px;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);text-decoration:none}.btn-primary{background:linear-gradient(135deg,var(--accent),#8b7cf7);color:#fff;box-shadow:var(--shadow-sm),0 0 12px var(--accent-glow)}.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-md),var(--shadow-glow)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-glass);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--border-light)}.btn-danger{background:#e1705526;color:var(--danger);border:1px solid rgba(225,112,85,.2)}.btn-danger:hover{background:#e1705540}.btn-sm{padding:6px 14px;font-size:13px}.btn-icon{width:36px;height:36px;padding:0;border-radius:var(--radius-sm);background:var(--bg-glass);color:var(--text-secondary);border:1px solid var(--border)}.btn-icon:hover{color:var(--text-primary);background:var(--bg-card-hover)}.input-group{display:flex;flex-direction:column;gap:6px}.input-group label{font-size:13px;font-weight:500;color:var(--text-secondary)}input[type=text],input[type=email],input[type=url],textarea{width:100%;padding:12px 16px;font-family:var(--font);font-size:14px;color:var(--text-primary);background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);outline:none;transition:all var(--transition);resize:vertical}input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}input::placeholder,textarea::placeholder{color:var(--text-muted)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px;transition:all var(--transition)}.card:hover{background:var(--bg-card-hover);border-color:var(--border-light)}.chat-container{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:12px}.message{max-width:85%;padding:12px 16px;border-radius:var(--radius-lg);font-size:14px;line-height:1.6;animation:slideUp .2s ease;word-wrap:break-word}.message.user{align-self:flex-end;background:linear-gradient(135deg,var(--accent),#8b7cf7);color:#fff;border-bottom-right-radius:4px}.message.assistant{align-self:flex-start;background:var(--bg-glass);border:1px solid var(--border);border-bottom-left-radius:4px}.message .timestamp{font-size:11px;opacity:.5;margin-top:6px}.chat-input-bar{display:flex;gap:10px;padding:12px 20px;border-top:1px solid var(--border);background:var(--bg-secondary);flex-shrink:0}.chat-input-bar input{flex:1}.typing-dots{display:flex;gap:4px;padding:12px 16px;align-self:flex-start}.typing-dots span{width:8px;height:8px;border-radius:50%;background:var(--text-muted);animation:pulse 1.2s ease-in-out infinite}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}.conv-list{display:flex;flex-direction:column;gap:4px;margin-bottom:16px}.conv-item{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);border:1px solid transparent}.conv-item:hover{background:var(--bg-card);border-color:var(--border)}.conv-item.active{background:var(--accent-soft);border-color:var(--accent)}.conv-item .conv-title{font-size:14px;font-weight:500;color:var(--text-primary)}.conv-item .conv-date{font-size:12px;color:var(--text-muted)}.note-card{padding:16px;margin-bottom:10px;position:relative}.note-card .pin-badge{position:absolute;top:12px;right:12px;font-size:14px}.note-card .note-content{font-size:14px;color:var(--text-primary);margin-bottom:10px;white-space:pre-wrap}.note-card .note-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.tag{padding:3px 10px;font-size:12px;font-weight:500;border-radius:var(--radius-full);background:var(--accent-soft);color:var(--accent)}.note-card .note-meta{font-size:12px;color:var(--text-muted)}.note-card .note-actions{display:flex;gap:8px;margin-top:10px}.file-card{display:flex;align-items:center;gap:14px;padding:14px 16px;margin-bottom:8px}.file-card .file-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);background:var(--accent-soft);color:var(--accent);font-size:18px;flex-shrink:0}.file-card .file-info{flex:1;min-width:0}.file-card .file-name{font-size:14px;font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-card .file-meta{font-size:12px;color:var(--text-muted)}.file-card .file-actions{display:flex;gap:6px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000a6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:200;padding:20px;animation:fadeIn .15s ease}.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);padding:24px;width:100%;max-width:480px;max-height:80vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:slideUp .2s ease}.modal h2{font-size:18px;font-weight:600;margin-bottom:16px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px;background:radial-gradient(ellipse at center top,rgba(108,92,231,.15),transparent 60%),var(--bg-primary)}.login-card{width:100%;max-width:400px;text-align:center}.login-card .logo{font-size:40px;margin-bottom:8px}.login-card h1{font-size:28px;font-weight:700;background:linear-gradient(135deg,var(--text-primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:6px}.login-card p{color:var(--text-secondary);font-size:14px;margin-bottom:28px}.login-card .input-group{margin-bottom:16px;text-align:left}.login-card .btn{width:100%;padding:14px;font-size:15px}.login-result{margin-top:16px;padding:12px;border-radius:var(--radius-md);font-size:14px}.login-result.success{background:#00b8941a;color:var(--success);border:1px solid rgba(0,184,148,.2)}.login-result.error{background:#e170551a;color:var(--danger);border:1px solid rgba(225,112,85,.2)}.settings-section{margin-bottom:28px}.settings-section h2{font-size:16px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.settings-section textarea{min-height:200px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center}.empty-state .icon{font-size:48px;margin-bottom:16px;opacity:.5}.empty-state p{color:var(--text-secondary);font-size:14px;max-width:280px}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.text-sm{font-size:13px}.text-muted{color:var(--text-secondary)}.w-full{width:100%}.hidden{display:none!important}@media(min-width:768px){.chat-container,.page-content{padding:24px 40px}.message{max-width:70%}}.research-result{margin-top:16px}.research-result .source-link{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:var(--accent-soft);color:var(--accent);border-radius:var(--radius-sm);font-size:13px;text-decoration:none;margin-top:12px;transition:all var(--transition)}.research-result .source-link:hover{background:#6c5ce740}.chat-layout{display:flex;flex:1;overflow:hidden}.chat-sidebar{width:280px;border-right:1px solid var(--border);background:var(--bg-secondary);display:none;flex-direction:column;overflow-y:auto}.chat-main{flex:1;display:flex;flex-direction:column;overflow:hidden}@media(min-width:768px){.chat-sidebar{display:flex}}.sidebar-header{padding:16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.sidebar-header h2{font-size:15px;font-weight:600}