:root{
    /* dark is the default palette — vintage black, warm and sooty */
    --bg:#0d0b09;
    --canvas-dot:#2b241c;
    --surface:#17130f;
    --surface-2:#201a14;
    --border:#2f2620;
    --border-strong:#423528;
    --text:#ece7de;
    --text-dim:#a89a86;
    --text-faint:#6b5f4f;
    --accent:#d9a65b;
    --accent-strong:#f0be7c;
    --accent-soft:rgba(217,166,91,0.16);
    --accent-ink:#241a0a;
    --danger:#e0715c;
    --danger-soft:rgba(224,113,92,0.16);
    --success:#6fbf8b;
    --moon-ring:#8fc2d6;
    --moon-glow:rgba(143,194,214,0.3);
    --shadow:0 24px 60px rgba(0,0,0,0.5);
    --r-sm:6px; --r-md:10px; --r-lg:18px;
    --font-display:'Fraunces',Georgia,serif;
    --font-ui:'IBM Plex Sans',-apple-system,BlinkMacSystemFont,sans-serif;
    --font-mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,monospace;
  }
  :root[data-theme="light"]{
    --bg:#f7f2e8;
    --canvas-dot:#ddd3ba;
    --surface:#ffffff;
    --surface-2:#f1e9d8;
    --border:#e2d8c0;
    --border-strong:#cfc09b;
    --text:#241f17;
    --text-dim:#6b6355;
    --text-faint:#a79f8c;
    --accent:#a9702e;
    --accent-strong:#8a5a22;
    --accent-soft:rgba(169,112,46,0.14);
    --accent-ink:#fff6e9;
    --danger:#b8452f;
    --danger-soft:rgba(184,69,47,0.12);
    --success:#357854;
    --moon-ring:#3f7a90;
    --moon-glow:rgba(63,122,144,0.22);
    --shadow:0 20px 50px rgba(60,45,15,0.14);
  }
  *{box-sizing:border-box;}
  html,body{height:100%;}
  body{
    margin:0;background:var(--bg);color:var(--text);
    font-family:var(--font-ui);font-size:14px;
    overflow:hidden;
  }
  button,input,textarea{font-family:inherit;color:inherit;}
  .icon{width:18px;height:18px;display:block;}
  .icon.fill{fill:currentColor;}

  #app{display:flex;flex-direction:column;height:100dvh;min-height:520px;}
  #app[hidden]{display:none;}
  [hidden]{display:none !important;}
  .auth-form{display:grid;gap:18px;margin-bottom:18px;}
  .auth-form label{display:grid;gap:8px;}
  .auth-form input,.admin-page textarea{background:var(--surface-2);border:1px solid var(--border-strong);border-radius:8px;padding:12px;color:var(--text);font:inherit;}
  #accountBar{position:fixed;bottom:8px;right:12px;z-index:60;background:var(--surface);padding:8px;border-radius:12px;font-size:12px;}
  #accountBar a,.admin-page a{color:var(--accent);}
  .admin-page,.admin-login{
    --bg:#000000;--surface:#101010;--surface-2:#1a1a1a;
    --border:#303030;--border-strong:#505050;
    --text:#ffffff;--text-dim:#c0c0c0;--text-faint:#999999;
    --accent:#eeeeee;--accent-strong:#ffffff;--accent-ink:#000000;
    --accent-soft:rgba(255,255,255,0.12);
    background:#000000;color:var(--text);color-scheme:dark;
    overflow:auto;padding:32px;max-width:900px;margin:auto;
  }
  .admin-page section{padding:24px;margin:24px 0;background:var(--surface);border:1px solid var(--border);border-radius:18px;}
  .admin-page textarea{display:block;width:100%;min-height:240px;margin:12px 0;}
  .admin-page li{margin:12px 0;}
  #chatTabs{display:flex;gap:8px;flex-wrap:wrap;}
  #chatTabs [aria-selected=true]{border-color:var(--accent);background:var(--accent-soft);}
  .chat-messages{height:260px;overflow:auto;border:1px solid var(--border);padding:12px;white-space:pre-wrap;overflow-wrap:anywhere;}
  .chat-message{margin-bottom:14px;padding:10px;background:var(--surface-2);border-radius:8px;}
  .chat-message small{display:block;color:var(--text-dim);margin-bottom:6px;}
  .chat-compose textarea{width:100%;min-height:70px;resize:vertical;background:var(--surface-2);color:var(--text);border:1px solid var(--border-strong);padding:10px;}
  .client-chat{padding:12px;overflow:auto;flex:1;}
  .users-table-wrap{overflow-x:auto;margin-top:18px;}
  .admin-page table{border-collapse:collapse;width:100%;font-size:12px;}
  .admin-page th,.admin-page td{text-align:left;vertical-align:top;padding:12px;border-bottom:1px solid var(--border);min-width:105px;}
  .admin-page td:first-child{min-width:200px;}
  .admin-page select{background:#161616;color:white;padding:8px;border:1px solid #505050;}
  .agreement-card{width:680px;}
  .agreement-text{white-space:pre-wrap;max-height:45vh;overflow:auto;line-height:1.6;margin:18px 0;padding:16px;background:var(--surface-2);}
  .admin-page .admin-label,.admin-login .admin-label{display:block;margin-top:4px;font-size:11px;font-weight:500;letter-spacing:0.16em;color:var(--text-dim);}
  .admin-login .picker-overlay{background:#000;}
  .admin-login .picker-title{margin-bottom:20px;}
  .admin-login a{color:var(--text-dim);}

  /* ---------- topbar ---------- */
  .topbar{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding:12px 18px;border-bottom:1px solid var(--border);
    background:var(--surface);flex:0 0 auto;flex-wrap:wrap;
  }
  .topbar-left{display:flex;align-items:center;gap:12px;min-width:0;flex:1 1 260px;}
  .topbar-right{display:flex;align-items:center;gap:8px;flex:0 0 auto;}
  .brand-block{display:flex;flex-direction:column;line-height:1.1;white-space:nowrap;}
  .brand{font-family:var(--font-display);font-size:19px;font-weight:600;letter-spacing:0.2px;}
  .brand-sub{font-family:var(--font-mono);font-size:8px;font-weight:500;color:var(--text-faint);letter-spacing:0.06em;text-transform:uppercase;}
  .notepad-title-wrap{display:flex;flex-direction:column;min-width:0;flex:1 1 auto;}
  .notepad-title-input{
    background:transparent;border:none;font-family:var(--font-display);
    font-size:18px;font-weight:500;color:var(--text);padding:2px 4px;border-radius:var(--r-sm);
    min-width:0;
  }
  .notepad-title-input:hover{background:var(--surface-2);}
  .notepad-title-input:focus{outline:2px solid var(--accent-soft);background:var(--surface-2);}
  .save-status{font-family:var(--font-mono);font-size:11px;color:var(--text-faint);padding:0 4px;}
  .save-status.saving{color:var(--accent);}
  .save-status.error{color:var(--danger);}

  .btn{
    font-family:var(--font-ui);font-size:13px;font-weight:500;
    padding:8px 14px;border-radius:999px;border:1px solid var(--border-strong);
    background:var(--surface-2);color:var(--text);cursor:pointer;
    display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
  }
  .btn:hover{border-color:var(--accent);}
  .btn-accent{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600;}
  .btn-accent:hover{background:var(--accent-strong);border-color:var(--accent-strong);}
  .btn-active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-strong);}
  .btn-danger-ghost{background:transparent;border-color:var(--danger);color:var(--danger);}
  .btn-danger-ghost:hover{background:var(--danger-soft);}
  .btn-danger-ghost.confirming{background:var(--danger);color:#fff;border-color:var(--danger);}
  .icon-btn{
    position:relative;
    width:34px;height:34px;border-radius:50%;border:1px solid var(--border-strong);
    background:var(--surface-2);color:var(--text-dim);display:flex;align-items:center;justify-content:center;
    cursor:pointer;flex:0 0 auto;
  }
  .icon-btn:hover{color:var(--text);border-color:var(--accent);}
  .icon-btn.flash-ok{border-color:var(--success);color:var(--success);}
  .icon-btn.flash-err{border-color:var(--danger);color:var(--danger);}
  .icon-btn.linked{border-color:var(--success);color:var(--success);}
  .icon-btn.needs-save::after{
    content:'';position:absolute;top:1px;right:1px;width:8px;height:8px;
    border-radius:50%;background:var(--accent);border:1.5px solid var(--surface);
  }

  /* ---------- canvas ---------- */
  .canvas-wrap{position:relative;flex:1 1 auto;overflow:hidden;min-height:0;}
  .canvas{
    position:absolute;inset:0;
    background-image:radial-gradient(var(--canvas-dot) 1.5px, transparent 1.5px);
    background-size:26px 26px;
  }
  .canvas-wrap.link-mode .canvas{cursor:crosshair;}
  .edges-layer{position:absolute;inset:0;pointer-events:none;}
  .edge{stroke:var(--accent);stroke-opacity:0.55;stroke-width:2;}

  .canvas-hint{
    position:absolute;left:50%;bottom:18px;transform:translateX(-50%);
    margin:0;font-family:var(--font-mono);font-size:11.5px;color:var(--text-faint);
    background:var(--surface);border:1px solid var(--border);padding:6px 14px;border-radius:999px;
    pointer-events:none;white-space:nowrap;
  }

  .node{
    position:absolute;transform:translate(-50%,-50%);
    display:flex;flex-direction:column;align-items:center;gap:6px;
    background:none;border:none;cursor:pointer;touch-action:none;
    padding:4px;width:104px;
  }
  .node-icon{
    width:52px;height:52px;border-radius:50%;
    background:var(--surface);border:1.5px solid var(--border-strong);
    display:flex;align-items:center;justify-content:center;color:var(--text-dim);
    box-shadow:var(--shadow);
  }
  .node .icon{width:22px;height:22px;}
  .node.main .node-icon{width:66px;height:66px;border-color:var(--accent);color:var(--accent);background:var(--accent-soft);}
  .node.main .icon{width:28px;height:28px;}
  .node.permanent .node-icon{border-style:dashed;border-color:var(--border-strong);}
  .node.chat-grouped .node-icon{border-style:solid;}
  .node-label{
    font-size:12px;color:var(--text-dim);text-align:center;
    max-width:104px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  }
  .node.active .node-icon{border-color:var(--accent);color:var(--accent-strong);box-shadow:0 0 0 4px var(--accent-soft), var(--shadow);}
  .node.active .node-label{color:var(--text);}
  .node.armed .node-icon{border-color:var(--success);color:var(--success);box-shadow:0 0 0 4px rgba(111,191,139,0.18);}
  .node:focus-visible .node-icon{outline:2px solid var(--accent);outline-offset:2px;}
  .node.dragging{opacity:0.85;}
  .node{transition:opacity .25s ease;}
  .node.dimmed{opacity:0.16;}
  .edge{transition:opacity .25s ease;}
  .edge.dim{opacity:0.12;}
  .btn[disabled]{opacity:0.4;cursor:not-allowed;}
  .btn[disabled]:hover{border-color:var(--border-strong);}
  .canvas-wrap.brain-mode .canvas{
    background-image:
      radial-gradient(circle at 50% 50%, var(--accent-soft), transparent 55%),
      radial-gradient(var(--canvas-dot) 1.5px, transparent 1.5px);
    background-size:auto, 26px 26px;
  }
  .canvas-wrap.brain-mode .node{cursor:pointer;}

  /* ---------- brain view liveliness ---------- */
  .star-field{position:absolute;inset:0;overflow:hidden;pointer-events:none;display:none;}
  .canvas-wrap.brain-mode .star-field{display:block;}
  .star{
    position:absolute;border-radius:50%;background:var(--accent-strong);
    opacity:0.08;animation-name:star-twinkle;animation-timing-function:ease-in-out;animation-iteration-count:infinite;
  }
  .star.bright{
    background:#fff8ec;
    box-shadow:0 0 4px 1px var(--accent-strong), 0 0 9px 2px rgba(240,190,124,0.35);
  }
  @keyframes star-twinkle{0%,100%{opacity:0.06;transform:scale(0.7);}50%{opacity:0.85;transform:scale(1.2);}}

  .orbit-ring{fill:none;stroke:var(--accent);stroke-opacity:0.16;stroke-width:1;stroke-dasharray:1.5 7;}

  .canvas-wrap.brain-mode .edge{stroke-width:1.6;stroke-dasharray:5 5;animation:edge-flow 0.9s linear infinite;}
  @keyframes edge-flow{to{stroke-dashoffset:-20;}}

  .canvas-wrap.brain-mode .node .node-icon{box-shadow:0 0 16px var(--accent-soft), var(--shadow);}
  .canvas-wrap.brain-mode .node.brain-moon .node-icon{border-color:var(--moon-ring);box-shadow:0 0 14px var(--moon-glow), var(--shadow);}
  .canvas-wrap.brain-mode .node.active.brain-moon .node-icon{border-color:var(--moon-ring);box-shadow:0 0 0 4px var(--moon-glow), var(--shadow);}
  /* Bootstrap's tight inner orbit around Counding — shrunk so its whole
     ring stays tucked inside Main's 66px disc instead of sitting out
     with the other planets. */
  .canvas-wrap.brain-mode .node.brain-inner .node-icon{width:22px;height:22px;border-color:var(--moon-ring);box-shadow:0 0 8px var(--moon-glow), var(--shadow);}
  .canvas-wrap.brain-mode .node.brain-inner .icon{width:11px;height:11px;}
  .canvas-wrap.brain-mode .node.brain-inner .node-label{font-size:9px;opacity:0.8;}
  .canvas-wrap.brain-mode .node.active.brain-inner .node-icon{box-shadow:0 0 0 3px var(--moon-glow), var(--shadow);}
  .canvas-wrap.brain-mode .node.main .node-icon{animation:sun-pulse 3s ease-in-out infinite;}
  @keyframes sun-pulse{
    0%,100%{box-shadow:0 0 18px 0 var(--accent-soft), var(--shadow);}
    50%{box-shadow:0 0 30px 8px var(--accent-soft), var(--shadow);}
  }
  @media (prefers-reduced-motion: reduce){
    .star,.canvas-wrap.brain-mode .edge,.canvas-wrap.brain-mode .node.main .node-icon{animation:none;}
  }

  /* ---------- drawer ---------- */
  .drawer{
    position:absolute;top:0;right:0;bottom:0;width:380px;max-width:100%;
    background:var(--surface);border-left:1px solid var(--border);
    display:flex;flex-direction:column;box-shadow:var(--shadow);
    transform:translateX(0);transition:transform .18s ease;
    z-index:5;
  }
  .drawer[hidden]{display:none;}
  .drawer-head{display:flex;align-items:flex-start;gap:10px;padding:16px 16px 10px;border-bottom:1px solid var(--border);}
  .icon-picker{display:flex;flex-wrap:wrap;gap:6px;width:134px;max-height:132px;overflow-y:auto;flex:0 0 auto;align-content:flex-start;}
  .icon-opt{
    width:29px;height:29px;border-radius:8px;border:1px solid var(--border-strong);
    background:var(--surface-2);color:var(--text-dim);display:flex;align-items:center;justify-content:center;cursor:pointer;
  }
  .icon-opt .icon{width:16px;height:16px;}
  .icon-opt.selected{border-color:var(--accent);color:var(--accent-strong);background:var(--accent-soft);}
  .icon-opt.locked{cursor:default;border-style:dashed;color:var(--text-dim);}
  .drawer-head-main{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;gap:4px;}
  .node-label-input{
    font-family:var(--font-display);font-size:18px;font-weight:500;
    background:transparent;border:none;border-radius:var(--r-sm);padding:3px 4px;width:100%;
  }
  .node-label-input:hover{background:var(--surface-2);}
  .node-label-input:focus{outline:2px solid var(--accent-soft);background:var(--surface-2);}
  .node-kind{font-family:var(--font-mono);font-size:10.5px;color:var(--text-faint);padding:0 4px;text-transform:uppercase;letter-spacing:0.06em;}

  .node-content{
    flex:1 1 auto;border:none;background:transparent;resize:none;
    padding:16px;font-family:var(--font-ui);font-size:14.5px;line-height:1.6;color:var(--text);
  }
  .node-content:focus{outline:none;}
  .node-content::placeholder{color:var(--text-faint);}

  .content-toolbar{display:flex;gap:6px;padding:8px 16px 0;}
  .format-btn{
    font-family:var(--font-ui);font-size:12px;font-weight:500;
    padding:5px 11px;border-radius:999px;border:1px solid var(--border-strong);
    background:var(--surface-2);color:var(--text-dim);cursor:pointer;
    display:inline-flex;align-items:center;gap:5px;
  }
  .format-btn:hover{border-color:var(--accent);color:var(--text);}

  .drawer-foot{border-top:1px solid var(--border);padding:12px 16px 16px;display:flex;flex-direction:column;gap:10px;}
  .drawer-foot-actions{display:flex;gap:8px;flex-wrap:wrap;}
  .drawer-foot-actions .btn{flex:1 1 auto;}
  .meta-label{font-family:var(--font-mono);font-size:10.5px;color:var(--text-faint);text-transform:uppercase;letter-spacing:0.06em;}
  .chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px;min-height:20px;}
  .chip{
    display:inline-flex;align-items:center;gap:5px;background:var(--surface-2);
    border:1px solid var(--border-strong);border-radius:999px;padding:4px 6px 4px 10px;font-size:12px;
  }
  .chip button{
    width:15px;height:15px;border-radius:50%;border:none;background:var(--border-strong);color:var(--text);
    display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0;
  }
  .chip button:hover{background:var(--danger);color:#fff;}
  .chip button .icon{width:9px;height:9px;}
  .chips-empty{font-size:12px;color:var(--text-faint);}

  /* ---------- picker overlay ---------- */
  .picker-overlay{
    position:fixed;inset:0;background:rgba(8,9,13,0.72);backdrop-filter:blur(3px);
    display:none;align-items:center;justify-content:center;z-index:50;padding:20px;
  }
  .picker-overlay.open{display:flex;}
  .picker-card{
    width:440px;max-width:100%;max-height:86vh;overflow:auto;
    background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
    box-shadow:var(--shadow);padding:28px;
  }
  .picker-title{font-family:var(--font-display);font-size:26px;font-weight:600;margin:0 0 3px;}
  .picker-eyebrow{font-family:var(--font-mono);font-size:9.5px;font-weight:500;color:var(--text-faint);letter-spacing:0.07em;text-transform:uppercase;margin:0 0 14px;}
  .picker-sub{margin:0 0 20px;color:var(--text-dim);font-size:13.5px;}
  .picker-screen[hidden]{display:none;}
  .picker-back-btn{
    background:none;border:none;color:var(--text-faint);font-family:var(--font-mono);
    font-size:11.5px;cursor:pointer;padding:0;margin:0 0 14px;text-transform:uppercase;letter-spacing:0.05em;
  }
  .picker-back-btn:hover{color:var(--accent);}
  .picker-choice-actions{display:flex;flex-direction:column;gap:10px;}
  .picker-choice-btn{width:100%;border-radius:var(--r-md);padding:15px 18px;font-size:14.5px;text-align:left;}
  .picker-import-link{
    display:block;width:100%;text-align:center;background:none;border:none;
    color:var(--text-faint);font-family:var(--font-mono);font-size:11px;
    letter-spacing:0.03em;cursor:pointer;padding:14px 0 0;text-decoration:underline;text-underline-offset:2px;
  }
  .picker-import-link:hover{color:var(--accent);}
  .picker-import-status{margin:8px 0 0;font-family:var(--font-mono);font-size:11px;color:var(--text-faint);min-height:14px;text-align:center;}
  .picker-list{display:flex;flex-direction:column;gap:8px;max-height:280px;overflow:auto;margin-bottom:18px;padding-right:2px;}
  .picker-loading,.picker-empty{font-size:13px;color:var(--text-faint);font-family:var(--font-mono);padding:8px 2px;}
  .picker-row{display:flex;align-items:stretch;gap:6px;}
  .picker-open-btn{
    flex:1 1 auto;text-align:left;background:var(--surface-2);border:1px solid var(--border);
    border-radius:var(--r-md);padding:10px 14px;cursor:pointer;display:flex;flex-direction:column;gap:2px;min-width:0;
  }
  .picker-open-btn:hover{border-color:var(--accent);}
  .picker-row-title{font-weight:600;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
  .picker-row-meta{font-family:var(--font-mono);font-size:11px;color:var(--text-faint);}
  .picker-del-btn{
    flex:0 0 auto;width:38px;border-radius:var(--r-md);border:1px solid var(--border);
    background:var(--surface-2);color:var(--text-faint);cursor:pointer;display:flex;align-items:center;justify-content:center;
  }
  .picker-del-btn:hover{border-color:var(--danger);color:var(--danger);}
  .picker-del-btn.confirming{background:var(--danger);border-color:var(--danger);color:#fff;}
  .picker-del-btn .icon{width:15px;height:15px;}
  .create-form{display:flex;gap:8px;border-top:1px solid var(--border);padding-top:16px;}
  .create-form input{
    flex:1 1 auto;min-width:0;background:var(--surface-2);border:1px solid var(--border-strong);
    border-radius:999px;padding:9px 16px;font-size:13.5px;
  }
  .create-form input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent);}
  .mode-toggle{display:flex;gap:6px;margin-bottom:16px;}
  .mode-pill{
    flex:1 1 auto;padding:9px 10px;border-radius:8px;border:1px solid var(--border-strong);
    background:var(--surface-2);color:var(--text-dim);cursor:pointer;font-size:12.5px;font-weight:600;
    font-family:var(--font-ui);text-align:center;
  }
  .mode-pill.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-strong);}
  .mode-pill[disabled]{opacity:0.4;cursor:not-allowed;}
  .dual-save-toggle{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-dim);margin:-6px 0 16px;cursor:pointer;}
  .dual-save-toggle input{accent-color:var(--accent);width:14px;height:14px;flex:0 0 auto;}

  /* ---------- sources drawer ---------- */
  .sources-heading{font-family:var(--font-display);font-size:18px;font-weight:500;}
  .sources-body{padding:16px;display:flex;flex-direction:column;gap:12px;overflow:auto;flex:1 1 auto;}
  .sources-hint{margin:0;font-size:12.5px;color:var(--text-dim);line-height:1.5;}
  .sources-list{display:flex;flex-direction:column;gap:8px;}
  .source-row{
    display:flex;align-items:center;gap:9px;background:var(--surface-2);
    border:1px solid var(--border);border-radius:var(--r-md);padding:8px 10px;
  }
  .source-icon{
    width:28px;height:28px;border-radius:50%;flex:0 0 auto;
    background:var(--surface);border:1px solid var(--border-strong);color:var(--text-dim);
    display:flex;align-items:center;justify-content:center;
  }
  .source-icon .icon{width:15px;height:15px;}
  .source-name{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12.5px;}
  .source-del-btn{
    flex:0 0 auto;width:26px;height:26px;border-radius:50%;border:1px solid var(--border);
    background:var(--surface);color:var(--text-faint);cursor:pointer;display:flex;align-items:center;justify-content:center;
  }
  .source-del-btn:hover{border-color:var(--danger);color:var(--danger);}
  .source-del-btn .icon{width:11px;height:11px;}
  .sources-add-row{display:flex;}
  .sources-add-row .btn{cursor:pointer;}
  .sources-status{margin:0;font-family:var(--font-mono);font-size:11px;color:var(--text-faint);min-height:14px;}

  @media (max-width:640px){
    .topbar{padding:10px 12px;}
    .brand-block{display:none;}
    .topbar-right{flex-wrap:wrap;justify-content:flex-end;row-gap:6px;width:100%;}
    .drawer{width:100%;}
    .icon-picker{width:100%;}
    .picker-card{padding:20px;}
    .canvas-hint{white-space:normal;max-width:86%;text-align:center;line-height:1.4;}
  }