:root{--ink:#182122;--muted:#66706e;--line:#d9dedb;--paper:#f6f7f4;--panel:#fff;--accent:#cbed45;--accent-strong:#a8d600;--danger:#b43b31;--shadow:0 18px 60px rgba(20,30,28,.12)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-size:16px;overflow:hidden}button,input,textarea{font:inherit;color:inherit}.hidden{display:none!important}
.topbar{height:64px;background:var(--ink);color:white;display:grid;grid-template-columns:260px minmax(280px,620px) 1fr;align-items:center;gap:24px;padding:0 18px;border-bottom:1px solid #303a39}.brand{display:flex;align-items:center;gap:12px;font-weight:720;letter-spacing:-.02em}.brand-mark{width:48px;height:48px;border-radius:14px;background:var(--ink);color:var(--accent);display:grid;place-items:center;font:800 1.35rem/1 Georgia,serif;border:1px solid #364140}.brand-mark.small{width:34px;height:34px;border-radius:9px;background:#25302f;border-color:#3d4947}.global-search{height:38px;border:1px solid #485250;border-radius:10px;background:#26302f;display:flex;align-items:center;padding:0 12px;gap:9px}.global-search input{flex:1;border:0;outline:0;background:transparent;color:white}.global-search input::placeholder{color:#aeb6b3}.global-search kbd{font-size:.73rem;color:#aeb6b3;border:1px solid #55605e;border-radius:5px;padding:2px 6px}.user-menu{justify-self:end;display:flex;align-items:center;gap:10px;font-size:.9rem}.avatar{width:31px;height:31px;display:grid;place-items:center;border-radius:50%;background:var(--accent);color:var(--ink);font-weight:800}.user-menu form{margin:0}.workspace{display:grid;grid-template-columns:220px 240px minmax(380px,1fr) 370px;height:calc(100vh - 64px);min-width:1050px}.panel{background:var(--panel);border-right:1px solid var(--line);min-width:0}.panel-head{height:50px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:.72rem;font-weight:800;letter-spacing:.1em;color:var(--muted)}.icon-button,.ghost{border:0;background:transparent;cursor:pointer;border-radius:7px;padding:6px 9px}.icon-button{font-size:1.25rem}.icon-button:hover,.ghost:hover{background:#edf0eb}.list{padding:8px;overflow:auto}.notebook-rail .list{height:calc(100% - 92px)}.notes-rail .list{height:calc(100% - 100px)}.list-item{width:100%;text-align:left;border:0;background:transparent;padding:10px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:8px}.list-item:hover{background:#f0f2ee}.list-item.active{background:#e9f4c4;color:#293500}.list-item .meta{display:block;color:var(--muted);font-size:.75rem;margin-top:3px}.book-icon{width:22px;height:26px;border:1.5px solid currentColor;border-radius:3px;display:inline-grid;place-items:center;font-size:.7rem}.rail-footer{height:42px;display:flex;align-items:center;gap:8px;padding:0 14px;font-size:.75rem;color:var(--muted);border-top:1px solid var(--line)}.status-dot{width:7px;height:7px;border-radius:50%;background:#79b400}.permissions-button{height:42px;width:100%;border:0;border-top:1px solid var(--line);background:white;text-align:left;padding:0 14px;color:var(--muted);cursor:pointer}.permissions-button:hover{color:var(--ink)}
.editor-panel{background:#fbfcfa;overflow:auto}.empty-state{height:100%;display:grid;place-content:center;text-align:center;color:var(--muted)}.empty-state h2{color:var(--ink);margin:.8rem 0 .25rem}.empty-symbol{font-size:2rem;color:var(--accent-strong)}.editor{max-width:820px;margin:0 auto;padding:36px 42px 80px}.document-head{display:flex;gap:16px;align-items:center}.title-input{flex:1;font:760 2rem/1.2 Georgia,"Times New Roman",serif;border:0;background:transparent;outline:0;min-width:0}.document-actions{display:flex;gap:6px}.primary,.danger{border:0;border-radius:8px;padding:9px 14px;font-weight:750;cursor:pointer}.primary{background:var(--accent);color:var(--ink)}.primary:hover{background:var(--accent-strong)}.danger{background:#f6e5e2;color:var(--danger)}.tags-input{width:100%;border:0;border-bottom:1px solid var(--line);padding:12px 0;background:transparent;outline:0;color:var(--muted)}#noteContent{width:100%;height:calc(100vh - 285px);min-height:420px;resize:none;border:0;background:transparent;outline:0;padding:22px 0;font:1rem/1.72 ui-monospace,SFMono-Regular,Menlo,monospace}.markdown{font:1.05rem/1.72 Georgia,"Times New Roman",serif;padding:18px 0;min-height:420px}.markdown h1,.markdown h2,.markdown h3{font-family:Georgia,serif;line-height:1.25}.markdown code{background:#e9ece7;padding:2px 5px;border-radius:4px}.markdown pre{background:var(--ink);color:#f4f7f2;padding:16px;border-radius:8px;overflow:auto}.markdown blockquote{border-left:3px solid var(--accent-strong);margin-left:0;padding-left:18px;color:var(--muted)}.wiki-link{color:#567500;background:#eff8d4;padding:1px 3px;border-radius:3px}.backlinks{border-top:1px solid var(--line);padding-top:18px;font-size:.84rem}.backlink{margin-top:8px;color:#567500;cursor:pointer}
.assistant-panel{border-right:0;background:#f0f2ed;display:flex;flex-direction:column}.assistant-head{padding:20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:start}.assistant-head h2{font:700 1.18rem/1.2 Georgia,serif;margin:3px 0}.eyebrow{font-size:.68rem;font-weight:850;letter-spacing:.13em;color:var(--muted);margin:0}.spark{color:#7aa000;font-size:1.4rem}.conversation{flex:1;padding:18px;overflow:auto}.assistant-message,.user-message{padding:13px 14px;border-radius:12px;margin-bottom:12px;line-height:1.5;white-space:pre-wrap;font-size:.9rem}.assistant-message{background:white;border:1px solid var(--line)}.user-message{background:var(--ink);color:white;margin-left:34px}.sources{margin:8px 0 16px;display:grid;gap:6px}.source-card{border:1px solid var(--line);background:#fbfcfa;border-radius:8px;padding:9px;font-size:.78rem;cursor:pointer}.ask-box{margin:14px;border:1px solid #bfc6c1;background:white;border-radius:12px;padding:10px}.ask-box textarea{width:100%;border:0;outline:0;resize:none}.ask-box>div{display:flex;justify-content:space-between;align-items:center;font-size:.72rem;color:var(--muted)}
dialog{border:0;border-radius:14px;padding:0;box-shadow:var(--shadow);min-width:420px}dialog::backdrop{background:rgba(10,18,17,.45);backdrop-filter:blur(3px)}.dialog-form{padding:24px;display:grid;gap:16px}.dialog-form.wide{min-width:720px}.dialog-form h3{margin:0;font:700 1.4rem Georgia,serif}.dialog-form label{display:grid;gap:6px;font-size:.85rem;font-weight:700}.dialog-form input,.dialog-form textarea{border:1px solid var(--line);border-radius:8px;padding:10px;outline:0}.dialog-actions,.dialog-title{display:flex;justify-content:space-between;align-items:center}.dialog-actions{justify-content:flex-end;gap:8px}.acl-grid{display:grid;grid-template-columns:1fr repeat(4,58px);gap:8px;align-items:center;padding:9px 0;border-bottom:1px solid var(--line)}.acl-head{font-size:.72rem;font-weight:800;color:var(--muted);text-align:center}.acl-head span:first-child{text-align:left}.acl-user small{display:block;color:var(--muted)}.acl-grid input{justify-self:center}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:10px 16px;border-radius:9px;box-shadow:var(--shadow)}
.login-page{display:grid;place-items:center;background:radial-gradient(circle at 20% 10%,#35413c 0,#182122 38%,#111817 100%);color:white;overflow:auto}.login-card{width:min(440px,calc(100vw - 36px));padding:42px;background:#202a29;border:1px solid #3b4644;border-radius:22px;box-shadow:0 30px 80px rgba(0,0,0,.35)}.login-card .brand-mark{background:#131b1a}.login-card h1{font:750 2.25rem/1.08 Georgia,serif;margin:10px 0}.login-copy{color:#c2cbc8;line-height:1.55}.login-button{display:block;text-align:center;text-decoration:none;margin-top:28px}.login-meta{font-size:.75rem;color:#87928f;margin:20px 0 0}.notice{padding:12px;border:1px solid #7c6735;background:#392f1c;border-radius:8px;margin-top:24px}
@media(max-width:1280px){.workspace{grid-template-columns:190px 220px minmax(360px,1fr) 320px}.editor{padding:30px 28px}.topbar{grid-template-columns:220px minmax(250px,520px) 1fr}}

/* Font stacks with complete Vietnamese glyph coverage on Windows, macOS and Linux. */
:root{--font-ui:"Segoe UI",Arial,Tahoma,"DejaVu Sans",sans-serif;--font-reading:"Segoe UI",Arial,Tahoma,"DejaVu Sans",sans-serif;--font-code:"Cascadia Mono","DejaVu Sans Mono",Consolas,monospace}
body,button,input,textarea,select,dialog{font-family:var(--font-ui);font-synthesis:none}
.brand-mark,.title-input,.markdown,.markdown h1,.markdown h2,.markdown h3,.assistant-head h2,.dialog-form h3,.login-card h1{font-family:var(--font-reading)}
#noteContent,.markdown code,.markdown pre{font-family:var(--font-code)}
.panel-tools{display:flex;align-items:center}.source-documents{border-top:1px solid var(--line);padding:18px 0;margin-top:12px}.document-card{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px;padding:11px 12px;border:1px solid var(--line);border-radius:9px;background:white}.document-card-name{min-width:0}.document-card-name strong,.document-card-name small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.document-card-name small,.dialog-copy{color:var(--muted)}.document-actions{display:flex;gap:6px;flex:none}.document-actions a{text-decoration:none}.dialog-form input[type=file]{background:white}.uploading{opacity:.65;pointer-events:none}
.map-dialog{width:min(1100px,94vw);height:min(760px,90vh);max-width:none}.map-shell{height:100%;padding:24px;display:flex;flex-direction:column}.map-shell h3{margin:3px 0;font:700 1.4rem var(--font-reading)}.map-tabs{display:flex;gap:8px;margin:18px 0 12px}.map-tab{border:1px solid var(--line);background:white;border-radius:8px;padding:8px 13px;cursor:pointer}.map-tab.active{background:var(--ink);color:white;border-color:var(--ink)}.structure-map{flex:1;overflow:auto;padding:20px;background:#f7f8f5;border:1px solid var(--line);border-radius:12px}.outline-root,.outline-root ul{list-style:none;margin:0;padding-left:24px}.outline-root{padding-left:0}.outline-node{position:relative;margin:8px 0}.outline-node::before{content:"";position:absolute;left:-14px;top:-9px;bottom:50%;width:12px;border-left:1px solid #aab3af;border-bottom:1px solid #aab3af}.outline-root>.outline-node::before{display:none}.outline-card{display:inline-block;max-width:680px;background:white;border:1px solid var(--line);border-left:4px solid var(--accent-strong);border-radius:8px;padding:9px 12px;box-shadow:0 3px 10px rgba(20,30,28,.05)}.outline-level{font-size:.68rem;color:var(--muted);margin-right:8px}.graph-map{position:relative;flex:1;min-height:480px;background:#111817;border-radius:12px;overflow:hidden}.graph-map svg{width:100%;height:100%;display:block}.graph-edge{stroke:#62706b;stroke-width:1.3;opacity:.7}.graph-edge.tag{stroke:#94ad42;stroke-dasharray:5 4}.graph-node{cursor:pointer}.graph-node circle{fill:#d6ff52;stroke:#101817;stroke-width:2}.graph-node text{fill:white;font:12px var(--font-ui);paint-order:stroke;stroke:#111817;stroke-width:4px;stroke-linejoin:round}.graph-node:hover circle{fill:white}.graph-legend{position:absolute;left:14px;bottom:12px;color:#c9d0cd;font-size:.75rem;display:flex;gap:18px}.graph-legend span{display:flex;align-items:center;gap:6px}.legend-line{display:inline-block;width:22px;border-top:2px solid #62706b}.legend-line.tag{border-color:#94ad42;border-top-style:dashed}.structure-empty{display:grid;place-content:center;height:100%;text-align:center;color:var(--muted)}