@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--sidebar-width: 272px;--bg-main: #ffffff;--bg-sidebar: #f8fafc;--bg-hover: #eff6ff;--bg-soft: #f8fbff;--bg-accent: #f0fdfa;--border-color: #e2e8f0;--border-strong: #cbd5e1;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--brand-color: #0ea5e9;--brand-teal: #0d9488;--brand-dark: #111827;--radius: 10px;--radius-lg: 16px;--radius-pill: 9999px;--shadow-soft: 0 10px 30px rgba(15, 23, 42, .06);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body,#root,.gpt-shell,.gpt-app{max-width:100%;overflow-x:hidden}html{scroll-behavior:smooth}body{font-family:var(--font-family);background:radial-gradient(circle at top left,rgba(14,165,233,.08),transparent 30%),radial-gradient(circle at top right,rgba(13,148,136,.08),transparent 28%),var(--bg-main);color:var(--text-primary);-webkit-font-smoothing:antialiased}a{color:inherit}button,input,select{font:inherit}.gpt-shell{position:relative}.gpt-app{display:flex;min-height:100vh;width:100%;background:transparent}.mobile-menu-btn,.mobile-overlay,.sidebar-close-btn{display:none}.gpt-sidebar{width:var(--sidebar-width);background:linear-gradient(180deg,#f8fafcfa,#ffffffeb);border-right:1px solid var(--border-color);display:flex;flex-direction:column;flex-shrink:0;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.sidebar-top{padding:18px;display:flex;flex-direction:column;gap:16px}.sidebar-mobile-topbar{display:flex;align-items:center;justify-content:space-between;gap:10px}.brand-logo{display:flex;align-items:center;gap:12px;min-width:0}.brand-mark,.profile-logo,.empty-logo,.avatar-logo,.avatar{display:flex;align-items:center;justify-content:center}.brand-mark{width:112px;height:auto;object-fit:contain}.brand-text-stack{display:flex;flex-direction:column;min-width:0}.logo-text{font-weight:800;font-size:1rem;line-height:1.1}.logo-subtext{font-size:.73rem;color:var(--text-secondary)}.logo-icon,.profile-icon,.empty-icon{display:none}.new-chat-btn,.nav-item,.browse-nav button,.send-btn,.sort-btn,.detail-nav-actions button,.sidebar-close-btn,.mobile-menu-btn{cursor:pointer}.new-chat-btn{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--border-color);padding:10px 12px;border-radius:var(--radius);font-weight:600;color:var(--text-primary);transition:background .2s,border-color .2s,transform .2s}.new-chat-btn:hover,.profile-btn:hover,.browse-nav button:hover,.detail-nav-actions button:hover,.sort-btn:hover{background:var(--bg-hover)}.new-chat-btn:hover{transform:translateY(-1px)}.sidebar-middle{flex:1;overflow-y:auto;padding:0 18px 18px;display:flex;flex-direction:column;gap:24px}.nav-group{display:flex;flex-direction:column;gap:6px}.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;background:transparent;border:none;border-radius:var(--radius);color:var(--text-primary);text-align:left}.nav-item:hover{background:var(--bg-hover)}.nav-item.active{background:#e0f2fe;color:#0c4a6e;font-weight:700}.stats-box{background:#ffffffeb;border:1px solid var(--border-color);border-radius:var(--radius);padding:12px;font-size:.88rem;color:var(--text-secondary);display:flex;flex-direction:column;gap:10px;box-shadow:0 8px 20px #0f172a0a}.stat-row{display:flex;justify-content:space-between;gap:12px}.stat-row span:last-child{font-weight:700;color:var(--text-primary)}.sidebar-bottom{padding:16px 18px 18px;border-top:1px solid var(--border-color)}.profile-btn{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text-primary);padding:8px;border-radius:var(--radius)}.profile-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;border:1px solid var(--border-color)}.profile-text{display:flex;flex-direction:column;min-width:0}.profile-name{font-weight:700;font-size:.92rem}.profile-sub{font-size:.76rem;color:var(--text-secondary)}.gpt-main{flex:1;display:flex;flex-direction:column;min-width:0;background:linear-gradient(180deg,#ffffffe0,#fff 22%,#fff)}.chat-view,.library-view{display:flex;flex-direction:column;min-height:100vh}.chat-messages{flex:1;overflow-y:auto;padding-bottom:24px}.chat-bottom-spacer{height:20px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100vh - 220px);max-width:760px;margin:0 auto;padding:36px 20px 28px;text-align:center}.empty-logo{width:min(240px,62vw);height:auto;margin-bottom:10px}.empty-pill{display:inline-flex;align-items:center;padding:.3rem .72rem;margin-bottom:12px;background:#e0f2fe;color:#0369a1;border:1px solid #bae6fd;border-radius:9999px;font-size:.78rem;font-weight:600;letter-spacing:.01em}.empty-state h2{font-size:clamp(1.72rem,3.5vw,2.4rem);margin-bottom:10px;font-weight:800;line-height:1.08;letter-spacing:-.035em;background:linear-gradient(135deg,var(--brand-dark) 25%,var(--text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.empty-copy{max-width:620px;margin:0 auto 14px;color:var(--text-secondary);font-size:.96rem;line-height:1.55}.trust-pill-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:18px}.trust-pill{display:inline-flex;align-items:center;padding:.38rem .78rem;background:#ffffffeb;color:var(--text-secondary);border:1px solid var(--border-color);border-radius:9999px;font-size:.78rem;font-weight:600}.suggestion-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;width:100%}.suggestion-card{background:#fffffff0;border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:14px 15px;text-align:left;display:flex;justify-content:space-between;align-items:center;transition:all .2s;color:var(--text-primary)}.suggestion-card:hover{background:#fff;border-color:#bae6fd;box-shadow:0 12px 24px #0ea5e914}.suggestion-text{font-size:.92rem}.suggestion-arrow{color:var(--brand-teal);font-weight:700}.message-row{padding:24px 0}.message-row.assistant{background:#f8fafc}.message-container{max-width:860px;margin:0 auto;display:flex;gap:18px;padding:0 20px}.avatar{width:30px;height:30px;border-radius:8px;font-weight:700;color:#fff;flex-shrink:0}.avatar-logo{width:24px;height:24px;object-fit:contain}.user .avatar{background:#475569}.assistant-avatar{background:#fff;border:1px solid #dbeafe}.message-content{flex:1;min-width:0;font-size:1rem;line-height:1.6}.message-text{white-space:pre-wrap}.sources-container{margin-top:16px}.sources-title{font-size:.8rem;font-weight:700;color:var(--text-secondary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.sources-chips{display:flex;flex-wrap:wrap;gap:8px}.source-chip{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--border-color);padding:6px 10px;border-radius:var(--radius-pill);font-size:.85rem;color:var(--text-primary)}.source-chip:hover{background:var(--bg-hover)}.source-chip-idx{background:var(--brand-dark);color:#fff;border-radius:50%;width:18px;height:18px;display:inline-flex;align-items:center;justify-content:center;font-size:10px;font-weight:700}.source-chip-title{max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.input-area{padding:14px 20px 18px;background:linear-gradient(180deg,#fff0,#fff 30%)}.gpt-input-form{max-width:860px;margin:0 auto;display:flex;align-items:center;gap:10px;background:#fffffff5;border:1px solid #d9e1eb;border-radius:24px;padding:6px 14px;box-shadow:0 10px 30px #0f172a0d}.gpt-input-form:focus-within{border-color:var(--brand-color);box-shadow:0 0 0 1px var(--brand-color),0 12px 30px #0ea5e914}.gpt-input-form input{flex:1;min-width:0;border:none;background:transparent;padding:10px 0;font-size:.98rem;outline:none;color:var(--text-primary)}.send-btn{background:linear-gradient(135deg,var(--brand-dark),var(--brand-color));color:#fff;border:none;border-radius:10px;width:34px;height:34px;display:flex;align-items:center;justify-content:center}.send-btn:disabled{background:#d7dde7;cursor:not-allowed}.input-disclaimer{text-align:center;font-size:.73rem;color:var(--text-secondary);margin-top:10px;max-width:760px;margin-left:auto;margin-right:auto}.library-view{padding:28px;gap:18px}.library-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.library-header h2{font-size:1.9rem;margin-bottom:6px}.library-header p,.library-header-stats{color:var(--text-secondary)}.library-header-stats{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end;font-size:.9rem}.library-header-stats span{background:var(--bg-soft);border:1px solid var(--border-color);border-radius:var(--radius-pill);padding:6px 10px}.library-toolbar{display:grid;grid-template-columns:minmax(0,2.2fr) repeat(3,minmax(0,1fr));gap:12px}.library-toolbar label{display:flex;flex-direction:column;gap:6px;min-width:0}.library-toolbar span{font-size:.82rem;font-weight:700;color:var(--text-secondary)}.library-toolbar input,.library-toolbar select{width:100%;min-width:0;border:1px solid var(--border-color);border-radius:12px;background:#fff;padding:11px 12px;color:var(--text-primary)}.library-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(320px,.95fr);gap:18px;min-height:0}.browse-panel,.library-detail-card,.library-empty{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft)}.library-table-panel{padding:0;overflow:hidden}.library-table-wrap{overflow:auto;max-width:100%}.library-table{width:100%;border-collapse:collapse;min-width:760px}.library-table th,.library-table td{padding:14px 16px;border-bottom:1px solid var(--border-color);vertical-align:top;text-align:left;font-size:.92rem}.library-table th{background:#f8fafc;color:var(--text-secondary);position:sticky;top:0;z-index:1}.library-table tbody tr{transition:background .18s ease}.library-table tbody tr:hover{background:#f8fbff}.library-table tbody tr.active{background:#eef8ff}.paper-cell-title{font-weight:700;margin-bottom:6px;line-height:1.4}.paper-cell-meta,.doi-cell{color:var(--text-secondary);word-break:break-word}.sort-btn{background:transparent;border:none;color:inherit;font-weight:700}.browse-nav{display:flex;justify-content:center;align-items:center;gap:14px;padding:16px;border-top:1px solid var(--border-color)}.browse-nav button,.detail-nav-actions button{padding:9px 14px;border:1px solid var(--border-color);background:#fff;border-radius:10px;color:var(--text-primary)}.browse-nav button:disabled,.detail-nav-actions button:disabled{opacity:.45;cursor:not-allowed}.library-detail-panel{min-width:0}.library-detail-card{padding:18px;position:sticky;top:24px;display:flex;flex-direction:column;gap:16px}.detail-nav-row{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.detail-kicker{display:inline-block;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary);margin-bottom:6px}.detail-nav-row h3{font-size:1.1rem;line-height:1.45}.detail-nav-actions{display:flex;gap:8px;flex-shrink:0}.detail-badges{display:flex;gap:8px;flex-wrap:wrap}.meta-badge{display:inline-flex;align-items:center;background:#eff6ff;border:1px solid #dbeafe;padding:5px 10px;border-radius:var(--radius-pill);font-size:.82rem;font-weight:700;color:#1d4ed8}.detail-section h4,.modal-section h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-bottom:8px}.detail-section p,.modal-section p,.meta-grid,.detail-meta-grid{line-height:1.65}.detail-section ul,.modal-section ul{padding-left:18px;line-height:1.65}.detail-meta-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;font-size:.9rem}.detail-meta-grid div{background:var(--bg-soft);border:1px solid var(--border-color);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:6px;min-width:0}.detail-meta-grid strong{font-size:.78rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.detail-meta-grid span{word-break:break-word}.detail-actions{display:flex;gap:10px;flex-wrap:wrap}.loading-spinner,.library-empty{padding:40px 20px;text-align:center;color:var(--text-secondary)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a7a;display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}.detail-modal{background:#fff;width:min(760px,100%);max-height:90vh;border-radius:var(--radius-lg);display:flex;flex-direction:column;box-shadow:0 20px 50px #0f172a40}.modal-header{padding:20px;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.modal-header h3{font-size:1.15rem;line-height:1.45}.close-btn,.sidebar-close-btn{background:transparent;border:none;font-size:20px;color:var(--text-secondary)}.modal-body{padding:20px;overflow-y:auto;flex:1}.modal-meta-bar{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}.meta-authors{color:var(--text-secondary);font-size:.92rem}.modal-section{margin-bottom:24px}.modal-section ul li{margin-bottom:8px}.meta-grid{display:flex;flex-direction:column;gap:10px;font-size:.92rem}.meta-grid div{word-break:break-word}.modal-footer{padding:20px;border-top:1px solid var(--border-color);display:flex;justify-content:flex-end;gap:12px;flex-wrap:wrap}.btn-primary,.btn-secondary{padding:10px 16px;border-radius:10px;text-decoration:none;font-size:.9rem;font-weight:700}.btn-primary{background:linear-gradient(135deg,var(--brand-dark),var(--brand-color));color:#fff}.btn-secondary{background:#fff;border:1px solid var(--border-color);color:var(--text-primary)}.typing-indicator{display:flex;gap:4px;align-items:center;height:24px}.typing-indicator span{width:6px;height:6px;background-color:var(--text-secondary);border-radius:50%;animation:typing 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}@keyframes typing{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}@media (max-width: 1100px){.library-layout{grid-template-columns:1fr}.library-detail-card{position:static}}@media (max-width: 900px){.library-toolbar{grid-template-columns:repeat(2,minmax(0,1fr))}.library-toolbar .toolbar-search{grid-column:1 / -1}}@media (max-width: 768px){.mobile-menu-btn{display:inline-flex;align-items:center;justify-content:center;position:fixed;top:14px;left:14px;width:42px;height:42px;border-radius:50%;border:1px solid var(--border-color);background:#fffffff5;box-shadow:0 8px 24px #0f172a1f;z-index:80;font-size:19px;color:var(--text-primary)}.mobile-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a61;border:none;z-index:60}.gpt-sidebar{position:fixed;top:0;left:0;height:100vh;width:min(86vw,320px);transform:translate(-105%);transition:transform .22s ease;z-index:70;box-shadow:20px 0 40px #0f172a26}.gpt-sidebar.open{transform:translate(0)}.sidebar-close-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%}.gpt-main{width:100%;min-width:0}.message-container,.library-view{padding-left:16px;padding-right:16px}.library-view{padding-top:72px}.chat-view{padding-top:50px;min-height:100svh}.chat-messages{padding-bottom:8px}.empty-state{justify-content:flex-start;min-height:auto;padding:10px 12px 8px}.empty-logo{width:min(140px,46vw);margin-bottom:4px}.empty-pill{margin-bottom:8px;padding:.26rem .65rem;font-size:.72rem}.empty-state h2{font-size:clamp(1.4rem,6vw,1.86rem);margin-bottom:6px;line-height:1.05}.empty-copy{font-size:.84rem;margin-bottom:8px;line-height:1.42;max-width:34ch}.trust-pill-row{display:none}.suggestion-grid{grid-template-columns:1fr;gap:8px}.suggestion-card:nth-child(n+3){display:none}.suggestion-card{padding:12px 14px}.source-chip-title{max-width:200px}.input-area{position:sticky;bottom:0;z-index:12;padding:10px 14px 14px;background:linear-gradient(180deg,#fff0,#fffffff0 16%,#fff 44%);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.gpt-input-form{border-radius:999px;padding:5px 9px 5px 12px;box-shadow:0 12px 28px #0f172a1a;border-color:#cfe3f5}.library-header{flex-direction:column}.library-header-stats{justify-content:flex-start}.library-toolbar{grid-template-columns:1fr}.library-table{min-width:640px}.detail-meta-grid{grid-template-columns:1fr}.detail-nav-row,.modal-header,.modal-footer,.detail-actions{flex-direction:column;align-items:stretch}.detail-nav-actions{width:100%}.detail-nav-actions button{flex:1}}@media (max-width: 520px){.message-container{gap:12px;padding:0 14px}.avatar{width:26px;height:26px;font-size:.82rem}.avatar-logo{width:20px;height:20px}.brand-mark{width:98px}.library-header h2{font-size:1.55rem}.library-table{min-width:560px}.modal-overlay{padding:12px}}