:root {
    --bg: #FCFBF9;           /* paper */
    --ink: #12161A;          /* carbon */
    --brand: #004A2E;        /* deep green */
    --accent: #FF8800;       /* accent orange */
    --muted: #7A828A;
    --card: #FFFFFF;
    --line: #E6E8EB;
  }
  
  [data-theme="dark"] {
    --bg: #0E1216;
    --ink: #E6E8EB;
    --card: #12161A;
    --line: #20262C;
    --muted: #9AA3AC;
  }
  
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial;
    background: var(--bg);
    color: var(--ink);
  }
  
  #app { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
  
  /* Sidebar */
  .sidebar {
    border-right: 1px solid var(--line);
    padding: 16px;
    display: flex; flex-direction: column; gap: 16px;
    position: sticky; top: 0; height: 100vh;
  }
  .brand { display: flex; gap: 12px; align-items: center; }
  .logo { width: 40px; height: 40px; display: grid; place-items: center; font-size: 20px; background: var(--line); border-radius: 8px; }
  .brand-meta h1 { margin: 0; font-size: 20px; letter-spacing: 0.6px; }
  .brand-meta p { margin: 2px 0 0; color: var(--muted); font-size: 12px; max-width: 200px; }
  
  .nav { display: flex; flex-direction: column; gap: 4px; }
  .nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 12px 8px 6px; }
  .nav-item { padding: 10px 12px; border-radius: 8px; text-decoration: none; color: var(--ink); display: block; }
  .nav-item:hover { background: var(--line); }
  .nav-item.active { background: color-mix(in oklab, var(--brand) 12%, transparent); color: var(--brand); font-weight: 600; }
  
  .sidebar-footer { margin-top: auto; display: grid; gap: 10px; }
  .status { font-size: 12px; color: var(--muted); display: flex; gap: 8px; align-items: center; }
  .dot { width: 8px; height: 8px; border-radius: 999px; display: inline-block; background: var(--muted); }
  .dot.online { background: #22C55E; }
  
  /* Main */
  .main { display: grid; grid-template-rows: auto 1fr auto; min-height: 100vh; }
  .topbar {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px; border-bottom: 1px solid var(--line);
    position: sticky; top: 0; background: var(--bg); z-index: 5;
  }
  .icon-btn { font-size: 20px; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; cursor: pointer; }
  .search { flex: 1; }
  .search input { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); }
  .chips { display: flex; gap: 8px; align-items: center; }
  .chip { border: 1px solid var(--line); background: var(--card); padding: 6px 8px; border-radius: 999px; font-size: 12px; color: var(--brand); }
  .chip.sticky { position: sticky; top: 12px; }
  
  .grid {
    display: grid;
    grid-template-columns: 1.3fr .7fr;
    gap: 16px;
    padding: 16px;
  }
  
  /* Cards */
  .card {
    background: var(--card); border: 1px solid var(--line); border-radius: 12px;
    display: grid;
  }
  .card-head {
    padding: 12px 14px; border-bottom: 1px solid var(--line);
    display: flex; align-items: center; justify-content: space-between;
  }
  .card-head h2 { margin: 0; font-size: 14px; letter-spacing: .02em; }
  .seg { display: flex; gap: 6px; }
  .seg-btn { border: 1px solid var(--line); padding: 6px 10px; border-radius: 8px; background: transparent; cursor: pointer; font-size: 12px; }
  .seg-btn.active { border-color: var(--brand); color: var(--brand); }
  
  /* Chat */
  .chat { grid-template-rows: auto 1fr auto; min-height: 520px; }
  .chat-stream { padding: 12px; display: grid; gap: 12px; overflow: auto; }
  .msg { display: grid; grid-template-columns: 40px 1fr; gap: 10px; }
  .msg .avatar { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 8px; background: var(--line); font-weight: 700; }
  .msg .bubble { background: color-mix(in oklab, var(--brand) 6%, var(--card)); border: 1px solid var(--line); padding: 10px 12px; border-radius: 10px; }
  .msg-ai .bubble { border-color: color-mix(in oklab, var(--brand) 30%, var(--line)); }
  .meta { color: var(--muted); font-size: 11px; margin-top: 6px; }
  
  .composer { border-top: 1px solid var(--line); padding: 10px; display: grid; gap: 8px; background: var(--bg); }
  .composer textarea { width: 100%; resize: none; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--card); color: var(--ink); }
  .composer-actions { display: flex; gap: 8px; justify-content: end; }
  
  /* Panels */
  .stack { display: grid; gap: 16px; }
  .kpis .kpi-row { display: grid; grid-template-columns: repeat(3, 1fr); padding: 12px; gap: 12px; }
  .kpi { background: color-mix(in oklab, var(--brand) 6%, var(--card)); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
  .kpi-label { font-size: 11px; color: var(--muted); }
  .kpi-value { font-size: 22px; font-weight: 700; }
  .kpi-sub { font-size: 11px; color: var(--muted); }
  
  .timeline .tl { list-style: none; margin: 0; padding: 8px 12px; display: grid; gap: 10px; }
  .timeline .tl li { display: grid; grid-template-columns: 10px 1fr auto; align-items: center; gap: 8px; }
  .timeline .dot { background: var(--accent); }
  .timeline time { color: var(--muted); font-size: 12px; }
  
  .tasks .list { list-style: none; margin: 0; padding: 8px 12px; display: grid; gap: 10px; }
  .tasks input[type="checkbox"] { transform: translateY(1px); }
  
  .systems .health { padding: 12px; display: grid; gap: 10px; }
  .bar { position: relative; height: 10px; background: var(--line); border-radius: 999px; }
  .bar span { position: absolute; left: 0; top: 0; bottom: 0; background: var(--brand); border-radius: 999px; }
  .bar label { position: absolute; right: 8px; top: -22px; font-size: 11px; color: var(--muted); }
  
  .footer { border-top: 1px solid var(--line); padding: 12px 16px; display: flex; justify-content: space-between; color: var(--muted); }
  .brandline .dot.brand { background: var(--brand); }
  
  /* Buttons */
  .button { border: none; background: var(--brand); color: white; border-radius: 10px; padding: 9px 14px; cursor: pointer; font-weight: 600; }
  .button.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); }
  .button.small { padding: 6px 10px; font-size: 12px; }
  
  /* Responsive */
  @media (max-width: 1080px) {
    #app { grid-template-columns: 64px 1fr; }
    .brand-meta { display: none; }
    .nav-label { display: none; }
    .nav-item span { display: inline-block; }
  }
  
  @media (max-width: 860px) {
    .grid { grid-template-columns: 1fr; }
    .chip.sticky { position: static; }
  }
  
  @media (max-width: 640px) {
    .sidebar { position: fixed; left: -280px; width: 280px; background: var(--bg); z-index: 10; }
    .sidebar.open { left: 0; }
    .main { grid-template-rows: auto 1fr auto; }
  }