:root{
  --bg:#F5F6F7;
  --panel:#FFFFFF;
  --side:#FAFBFC;
  --text:#1F2329;
  --text-2:#646A73;
  --text-3:#8F959E;
  --line:#E4E6EB;
  --line-soft:#EFF0F2;
  --brand:#3370FF;
  --brand-weak:#EAF1FF;
  --brand-ink:#245BDB;
  --ok:#2EA121;
  --warn:#D97706;
  --err:#D83931;
  --r-sm:6px; --r-md:10px; --r-lg:14px;
  --shadow-1:0 1px 2px rgba(31,35,41,.06), 0 1px 3px rgba(31,35,41,.04);
  --shadow-2:0 6px 24px rgba(31,35,41,.12);
  --side-w:280px;
  --top-h:52px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:14px;line-height:1.6;
  -webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;
  overscroll-behavior-y:none;
}
button,input{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
a{color:var(--brand);text-decoration:none}

/* ---------------- boot ---------------- */
.boot{
  position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(1100px 520px at 50% -10%,#E9F0FF 0%,#F5F6F7 55%,#F5F6F7 100%);
  padding:24px;
}
.boot[hidden]{display:none}
.boot-card{
  width:100%;max-width:420px;text-align:center;
  background:var(--panel);border:1px solid var(--line);border-radius:18px;
  box-shadow:0 10px 40px rgba(31,35,41,.08);
  padding:34px 28px 22px;
}
.brand-mark{display:flex;justify-content:center;margin-bottom:14px}
.boot-card h1{font-size:19px;margin:0 0 6px;letter-spacing:.2px}
.boot-status{
  display:flex;align-items:center;justify-content:center;gap:8px;
  color:var(--text-2);font-size:13px;margin:10px 0 0;min-height:20px;
}
.boot-status.err{color:var(--err)}
.spinner{
  width:13px;height:13px;border-radius:50%;flex:none;
  border:2px solid #D6DEF0;border-top-color:var(--brand);
  animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.boot-actions{display:flex;gap:10px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.boot-actions[hidden]{display:none}
.boot-diag{
  margin-top:16px;text-align:left;font-family:var(--mono);font-size:11.5px;line-height:1.55;
  color:var(--text-2);background:#F7F8FA;border:1px solid var(--line-soft);
  border-radius:8px;padding:10px 12px;max-height:180px;overflow:auto;white-space:pre-wrap;word-break:break-word;
}
.boot-diag[hidden]{display:none}
.boot-foot{color:var(--text-3);font-size:11.5px;margin:18px 0 0}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:34px;padding:0 16px;border-radius:var(--r-sm);font-size:13px;font-weight:500;
  transition:background .15s,border-color .15s,opacity .15s;
}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-ink)}
.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--text-2)}
.btn-ghost:hover{background:#F5F6F7}

/* ---------------- layout ---------------- */
.app{display:flex;flex-direction:column;height:100dvh;height:100vh}
.app[hidden]{display:none}

.topbar{
  height:var(--top-h);flex:none;display:flex;align-items:center;gap:10px;
  padding:0 14px;background:var(--panel);border-bottom:1px solid var(--line);
  position:relative;z-index:30;
}
.brand{display:flex;align-items:center;gap:8px;min-width:0}
.brand-dot{width:8px;height:8px;border-radius:3px;background:linear-gradient(135deg,#4C88FF,#2B5CE6);flex:none}
.brand-name{font-weight:600;font-size:14px;letter-spacing:.2px;white-space:nowrap}
.topbar-spacer{flex:1}
.topbar-actions{display:flex;align-items:center;gap:4px}
.icon-btn{
  width:32px;height:32px;border-radius:var(--r-sm);display:inline-flex;
  align-items:center;justify-content:center;color:var(--text-2);
}
.icon-btn:hover{background:#F2F3F5;color:var(--text)}
.user-chip{
  display:flex;align-items:center;gap:7px;padding:3px 10px 3px 3px;border-radius:999px;
  background:#F5F6F7;margin-left:6px;max-width:200px;
}
.user-chip[hidden]{display:none}
.avatar{width:24px;height:24px;border-radius:50%;object-fit:cover;background:#DDE3EE;flex:none}
.user-name{font-size:12.5px;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.layout{flex:1;display:flex;min-height:0;position:relative}

.sidebar{
  width:var(--side-w);flex:none;display:flex;flex-direction:column;min-height:0;
  background:var(--side);border-right:1px solid var(--line);
  padding:12px 10px 0;
}
.side-search{
  position:relative;display:flex;align-items:center;gap:6px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  height:32px;padding:0 9px;color:var(--text-3);flex:none;
}
.side-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand-weak)}
.side-search input{
  flex:1;min-width:0;border:0;outline:0;background:none;font-size:13px;color:var(--text);
  height:100%;
}
.side-search input::placeholder{color:var(--text-3)}
.side-search input::-webkit-search-cancel-button{display:none}
.clear-btn{color:var(--text-3);font-size:16px;line-height:1;padding:0 2px}
.clear-btn[hidden]{display:none}

.space-picker{position:relative;margin-top:10px;flex:none}
.space-btn{
  width:100%;display:grid;grid-template-columns:1fr auto;grid-template-areas:"l c" "n c";
  align-items:center;gap:0 6px;text-align:left;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:7px 10px;
}
.space-btn:hover{border-color:#CBD2DC}
.space-label{grid-area:l;font-size:11px;color:var(--text-3);line-height:1.4}
.space-name{
  grid-area:n;font-size:13px;font-weight:500;color:var(--text);line-height:1.4;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.chev{grid-area:c;color:var(--text-3);transition:transform .18s}
.space-btn.open .chev{transform:rotate(180deg)}
.space-menu{
  position:absolute;left:0;right:0;top:calc(100% + 6px);z-index:40;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--shadow-2);max-height:min(52vh,340px);overflow:auto;padding:5px;
}
.space-menu[hidden]{display:none}
.space-menu .item{
  display:flex;flex-direction:column;gap:1px;padding:7px 9px;border-radius:var(--r-sm);width:100%;text-align:left;
}
.space-menu .item:hover{background:#F2F5FB}
.space-menu .item[aria-selected="true"]{background:var(--brand-weak)}
.space-menu .item .t{font-size:13px;font-weight:500;display:flex;align-items:center;gap:6px}
.space-menu .item .d{font-size:11.5px;color:var(--text-3);line-height:1.4;
  overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical}
.space-menu .badge{font-size:10px;padding:0 5px;border-radius:4px;background:#EEF0F3;color:var(--text-3);font-weight:400}
.space-menu .empty{padding:12px 10px;color:var(--text-3);font-size:12.5px;text-align:center}

.tree-scroll{flex:1;min-height:0;overflow:auto;margin:10px -4px 0;padding:0 4px 12px}
.tree{display:flex;flex-direction:column;gap:1px}
.node{
  display:flex;align-items:center;gap:5px;width:100%;text-align:left;
  padding:5px 6px 5px calc(6px + var(--depth,0) * 14px);
  border-radius:var(--r-sm);color:var(--text-2);font-size:13px;line-height:1.5;
  position:relative;
}
.node:hover{background:#EFF1F4;color:var(--text)}
.node.active{background:var(--brand-weak);color:var(--brand-ink);font-weight:500}
.node.active::before{
  content:"";position:absolute;left:0;top:5px;bottom:5px;width:2px;border-radius:2px;background:var(--brand);
}
.node .twist{
  width:14px;height:14px;flex:none;display:inline-flex;align-items:center;justify-content:center;
  color:var(--text-3);transition:transform .15s;
}
.node .twist.open{transform:rotate(90deg)}
.node .twist.leaf{visibility:hidden}
.node .ico{width:15px;height:15px;flex:none;color:var(--text-3);display:inline-flex}
.node.active .ico{color:var(--brand)}
.node .label{
  flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.node .cnt{font-size:11px;color:var(--text-3);flex:none}
.node.loading .label{color:var(--text-3)}
.skel{height:13px;border-radius:4px;background:linear-gradient(90deg,#EDEFF2,#F5F6F8,#EDEFF2);
  background-size:200% 100%;animation:sh 1.2s ease-in-out infinite;flex:1}
@keyframes sh{0%{background-position:100% 0}100%{background-position:-100% 0}}
.tree-note{padding:10px 8px;color:var(--text-3);font-size:12px;line-height:1.6}
.tree-note a{color:var(--brand)}

.side-foot{
  flex:none;display:flex;align-items:center;gap:6px;
  border-top:1px solid var(--line-soft);margin:0 -10px;padding:8px 14px;
  font-size:11.5px;color:var(--text-3);
}
.dot-live{width:6px;height:6px;border-radius:50%;background:var(--ok);flex:none}
.dot-live.off{background:var(--err)}
.dot-live.busy{background:var(--warn)}

/* ---------------- main / doc ---------------- */
.main{flex:1;min-width:0;min-height:0;overflow:auto;background:var(--bg)}
.doc{max-width:820px;margin:0 auto;padding:26px 30px 72px}

.empty{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;min-height:62vh;color:var(--text-2);
}
.empty-art{margin-bottom:18px;opacity:.95}
.empty h2{font-size:16px;margin:0 0 6px;font-weight:600;color:var(--text)}
.empty p{margin:0;font-size:13px;color:var(--text-3);max-width:340px}

.doc-head{margin-bottom:18px}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:4px;font-size:12px;color:var(--text-3);margin-bottom:10px}
.crumbs button{color:var(--text-3);padding:0}
.crumbs button:hover{color:var(--brand)}
.crumbs .sep{opacity:.6}
.doc-title{font-size:24px;line-height:1.35;font-weight:650;margin:0 0 10px;letter-spacing:-.1px;word-break:break-word}
.doc-meta{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px;color:var(--text-3);align-items:center}
.pill{
  display:inline-flex;align-items:center;gap:4px;height:20px;padding:0 7px;border-radius:4px;
  background:#EEF0F3;color:var(--text-2);font-size:11px;font-weight:500;
}
.pill.blue{background:var(--brand-weak);color:var(--brand-ink)}
.doc-tools{display:flex;gap:8px;margin-top:14px}
.tool-btn{
  display:inline-flex;align-items:center;gap:5px;height:28px;padding:0 10px;
  border:1px solid var(--line);border-radius:var(--r-sm);background:#fff;color:var(--text-2);font-size:12px;
}
.tool-btn:hover{background:#F7F8FA;color:var(--text)}

.doc-body{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 30px 30px;box-shadow:var(--shadow-1);
}
.doc-body.is-text{padding:24px 28px}
.prose{font-size:14.5px;line-height:1.85;color:#2B3038;white-space:pre-wrap;word-break:break-word}
.prose.is-pre{font-family:var(--mono);font-size:13px;line-height:1.75;white-space:pre;overflow-x:auto;color:#333}

.media-wrap{margin:0 0 14px}
.media-img{max-width:100%;height:auto;border-radius:var(--r-sm);border:1px solid var(--line-soft);display:block}
.file-row{
  display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);
  border-radius:var(--r-md);background:#fff;margin:0 0 12px;
}
.file-ico{
  width:34px;height:34px;border-radius:8px;background:var(--brand-weak);color:var(--brand-ink);
  display:flex;align-items:center;justify-content:center;flex:none;font-size:11px;font-weight:700;
}
.file-meta{flex:1;min-width:0}
.file-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-sub{font-size:11.5px;color:var(--text-3)}

.doc-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.action{
  display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 14px;
  border-radius:var(--r-sm);border:1px solid var(--line);background:#fff;color:var(--text-2);
  font-size:13px;font-weight:500;
}
.action:hover{border-color:#C7D0DE;color:var(--text)}
.action.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.action.primary:hover{background:var(--brand-ink)}

/* states */
.state{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:56px 24px;color:var(--text-2);
}
.state h3{font-size:15px;margin:0 0 8px;font-weight:600;color:var(--text)}
.state p{margin:0;font-size:13px;color:var(--text-3);max-width:420px;line-height:1.7}
.state .code{
  margin-top:14px;font-family:var(--mono);font-size:11.5px;color:var(--text-3);
  background:#F7F8FA;border:1px solid var(--line-soft);border-radius:6px;padding:8px 10px;
  max-width:100%;overflow:auto;white-space:pre-wrap;word-break:break-word;text-align:left;
}
.state .actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap;justify-content:center}
.state-icon{
  width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  margin-bottom:14px;background:#FDECEC;color:var(--err);
}
.state-icon.warn{background:#FFF6E8;color:var(--warn)}
.state-icon.info{background:var(--brand-weak);color:var(--brand)}
.doc-loading{padding:10px 0}
.doc-loading .bar{height:14px;border-radius:5px;margin-bottom:12px;
  background:linear-gradient(90deg,#EEF0F3,#F7F8FA,#EEF0F3);background-size:200% 100%;animation:sh 1.3s ease-in-out infinite}
.doc-loading .bar:nth-child(1){height:26px;width:52%}
.doc-loading .bar:nth-child(2){width:34%}
.doc-loading .bar:nth-child(4){width:88%}
.doc-loading .bar:nth-child(5){width:72%}

/* ---------------- modal ---------------- */
.modal{
  position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;
  background:rgba(31,35,41,.36);padding:20px;backdrop-filter:blur(2px);
}
.modal[hidden]{display:none}
.modal-card{
  width:100%;max-width:560px;max-height:80vh;display:flex;flex-direction:column;
  background:#fff;border-radius:var(--r-lg);box-shadow:var(--shadow-2);overflow:hidden;
}
.modal-head{display:flex;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line-soft)}
.modal-head h3{margin:0;font-size:14.5px;font-weight:600;flex:1}
.modal-body{padding:14px 16px;overflow:auto;font-family:var(--mono);font-size:12px;line-height:1.65;white-space:pre-wrap;word-break:break-word;color:var(--text-2)}
.modal-foot{padding:10px 16px 14px;display:flex;justify-content:flex-end;border-top:1px solid var(--line-soft)}

/* ---------------- toast ---------------- */
.toast-wrap{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:90;
  display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none;
  width:calc(100% - 32px);max-width:420px;
}
.toast{
  background:rgba(31,35,41,.92);color:#fff;font-size:13px;line-height:1.5;
  padding:9px 14px;border-radius:8px;box-shadow:var(--shadow-2);
  animation:tin .18s ease-out;max-width:100%;
}
.toast.err{background:rgba(216,57,49,.95)}
@keyframes tin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.scrim{display:none}
.only-mobile{display:none}

/* ---------------- responsive ---------------- */
@media (max-width:860px){
  :root{--side-w:min(86vw,320px)}
  .only-mobile{display:inline-flex}
  .sidebar{
    position:absolute;left:0;top:0;bottom:0;z-index:50;transform:translateX(-102%);
    transition:transform .22s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow-2);
    width:var(--side-w);
  }
  .sidebar.open{transform:none}
  .scrim{
    display:block;position:absolute;inset:0;z-index:45;background:rgba(31,35,41,.3);
    opacity:0;pointer-events:none;transition:opacity .22s;
  }
  .scrim.show{opacity:1;pointer-events:auto}
  .doc{padding:18px 16px 60px}
  .doc-body{padding:18px 16px 22px;border-radius:var(--r-md)}
  .doc-body.is-text{padding:18px 16px}
  .doc-title{font-size:20px}
  .brand-name{display:none}
  .user-chip{max-width:120px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}