:root {
  /* ---- Base surfaces: light, minimal -- not a dark control room ---- */
  --bg-void: #eef0f2;
  --bg-base: #f5f6f8;
  --bg-panel: #ffffff;
  --bg-panel-raised: #eef1f4;
  --bg-inset: #f2f4f6;
  --bg-header: #ffffff;

  --border: #dde1e6;
  --border-strong: #c3c9d0;
  --border-soft: #edeff2;

  /* ---- Accent: safety-orange, the one warm color ----
     Darkened from the original #ff6a00 (2.87:1 on white, fails WCAG AA)
     to clear 4.5:1 for normal text. */
  --accent: #c24e00;
  --accent-dim: #a03f00;
  --accent-bright: #ff8433;
  --accent-glow: rgba(194, 78, 0, 0.16);

  /* ---- Secondary: a cyan dark enough to read as text on white ---- */
  --cyan: #0088a3;
  --cyan-dim: #006c81;
  --cyan-bright: #00a3c4;
  --cyan-glow: rgba(0, 136, 163, 0.14);

  /* Legacy alias names kept so nothing else in this file has to change
     meaning -- these used to be the soft corporate-blue palette, now they
     point at the cyan accent instead. A couple of spots (topbar) still
     want a genuinely dark surface for contrast even on an otherwise light
     theme, hence navy-* staying real dark values, not aliases. */
  --navy-900: #12151a;
  --navy-800: #1b2027;
  --navy-700: #262c34;
  --blue: var(--cyan);
  --blue-dark: var(--cyan-dim);
  --blue-bright: var(--cyan-bright);
  --blue-pale: rgba(0, 136, 163, 0.1);
  --teal: var(--cyan);
  --teal-dark: var(--cyan-dim);
  --teal-pale: rgba(0, 136, 163, 0.1);

  /* ---- Text ---- */
  --gray-text: #1a1d21;
  --gray-muted: #667085;
  --gray-faint: #6b7488; /* darkened from #98a2b3 (2.58:1) to 4.69:1 -- it's used for real small text (hints, empty states), not just decoration */
  --text-on-accent: #ffffff;

  /* aliases carried through for existing selectors */
  --gray-bg: var(--bg-base);
  --gray-panel: var(--bg-header);
  --gray-surface: var(--bg-panel);
  --gray-border: var(--border);
  --gray-border-soft: var(--border-soft);

  /* ---- Status: saturated but readable on white, sharp not soft ----
     green/amber/red darkened to clear 4.5:1 against both plain white and
     their own *-pale badge backgrounds below. */
  --green: #167a3e;
  --green-pale: rgba(22, 122, 62, 0.1);
  --amber: #8a5d00;
  --amber-pale: rgba(138, 93, 0, 0.12);
  --red: #c13324;
  --red-pale: rgba(193, 51, 36, 0.1);
  --gray-status: #8a94a1;
  --gray-status-pale: rgba(138, 148, 161, 0.12);

  /* ---- Elevation: minimal, not the heavy dark drop-shadows ---- */
  --shadow-sm: 0 1px 2px rgba(16, 24, 32, 0.06);
  --shadow-md: 0 4px 14px rgba(16, 24, 32, 0.10);
  --shadow-lg: 0 16px 40px rgba(16, 24, 32, 0.16);

  --radius: 2px;
  --radius-lg: 3px;

  --mono: "Cascadia Mono", "Consolas", "Menlo", monospace;
  --sans: "Segoe UI", "Tahoma", Arial, sans-serif;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%;
  font-family: var(--sans);
  color: var(--gray-text);
  background: var(--bg-base);
  font-size: 13px;
}

::selection { background: var(--accent-glow); }

/* Slim, unobtrusive scrollbars everywhere */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 9px; height: 9px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 0; border: 2px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: var(--gray-muted); background-clip: padding-box; }

button {
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: background-color 0.1s var(--ease), border-color 0.1s var(--ease), color 0.1s var(--ease), transform 0.06s var(--ease);
}
button:disabled { cursor: not-allowed; opacity: 0.45; }
button:active:not(:disabled) { transform: translateY(1px); }

.btn {
  background: var(--bg-panel);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 5px 11px;
  color: var(--gray-text);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.btn:hover:not(:disabled) { background: var(--bg-panel-raised); border-color: var(--cyan); color: var(--cyan-dim); }
.btn-primary { background: var(--accent); color: var(--text-on-accent); border-color: var(--accent-dim); }
.btn-primary:hover:not(:disabled) { background: var(--accent-dim); color: var(--text-on-accent); }
.btn-teal { background: var(--cyan); color: var(--text-on-accent); border-color: var(--cyan-dim); }
.btn-teal:hover:not(:disabled) { background: var(--cyan-dim); }
.btn-danger { color: var(--red); border-color: var(--border-strong); }
.btn-danger:hover:not(:disabled) { background: var(--red-pale); border-color: var(--red); }
.btn-small { padding: 3px 8px; font-size: 10px; }
.btn-icon { padding: 4px 7px; line-height: 1; }
.btn-block { width: 100%; }
.btn-link { background: none; border: none; color: var(--cyan-dim); text-decoration: underline; padding: 0; text-transform: none; letter-spacing: normal; font-weight: 400; }

/* Ghost buttons sit on the dark topbar chrome */
.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #eef1f4;
}
.btn-ghost:hover:not(:disabled) { background: rgba(255, 255, 255, 0.16); border-color: rgba(255, 255, 255, 0.4); color: #fff; }
.btn-ghost.btn-danger { color: #ffb4a8; }
.btn-ghost.btn-danger:hover:not(:disabled) { background: rgba(209, 60, 46, 0.35); border-color: #e06b5c; color: #fff; }
.btn-ghost:disabled { opacity: 0.35; }

/* The topbar stays a deliberately dark strip for contrast/wayfinding even
   on an otherwise light theme -- any plain .btn placed in it auto-adapts. */
.topbar .btn {
  background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.2); color: #eef1f4;
}
.topbar .btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.16); border-color: rgba(255, 255, 255, 0.4); color: #fff; }
.topbar .btn-primary { background: var(--accent); border-color: var(--accent-dim); color: var(--text-on-accent); }
.topbar .btn-primary:hover:not(:disabled) { background: var(--accent-dim); }
.topbar .btn-danger { color: #ffb4a8; }
.topbar .btn-danger:hover:not(:disabled) { background: rgba(209, 60, 46, 0.35); border-color: #e06b5c; color: #fff; }
.topbar .btn:disabled { opacity: 0.55; }

.btn-spin {
  display: inline-block; width: 11px; height: 11px; margin-right: 5px;
  border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%;
  animation: spin 0.7s linear infinite; vertical-align: -2px; opacity: 0.7;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- App shell ---------- */
#app-root { display: flex; flex-direction: column; height: 100vh; }

.topbar {
  display: flex; align-items: center; gap: 20px;
  background: var(--navy-900);
  border-bottom: 2px solid var(--accent);
  padding: 7px 14px;
  flex-shrink: 0;
  position: relative;
  z-index: 5;
}
.topbar-brand { display: flex; align-items: center; gap: 9px; font-weight: 700; color: #fff; cursor: pointer; user-select: none; text-transform: uppercase; letter-spacing: 0.05em; font-size: 13px; }
.topbar-brand:hover .topbar-logo { box-shadow: 0 0 0 2px var(--accent-glow); }
.topbar-logo {
  display: block;
  width: 24px; height: 24px;
  border-radius: 0;
  transition: box-shadow 0.15s var(--ease);
}
.topbar-toolbar { display: flex; align-items: center; gap: 6px; flex: 1; }
.toolbar-target {
  color: #b6bfc9; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.04em;
  margin-right: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px;
}
.toolbar-target strong { color: #fff; font-weight: 700; }
.toolbar-sep { width: 1px; height: 20px; background: rgba(255, 255, 255, 0.2); margin: 0 4px; }
.topbar-user { display: flex; align-items: center; gap: 10px; color: #b6bfc9; font-size: 11px; }
.topbar-user .btn-link { color: #7fd4e8; }

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

/* ---------- Tree panel ---------- */
.tree-panel {
  width: 260px; flex-shrink: 0;
  background: var(--bg-panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.tree-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px; font-weight: 700; font-size: 10.5px;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-header);
}
.tree-panel-header-actions { display: flex; align-items: center; gap: 6px; }

.add-menu-wrap { position: relative; }
.add-menu {
  position: absolute; top: calc(100% + 6px); right: 0; z-index: 50; width: 240px;
  background: var(--bg-panel); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); padding: 6px; text-transform: none; letter-spacing: normal;
}
.add-menu-item {
  display: flex; align-items: flex-start; gap: 10px; width: 100%; text-align: left;
  background: none; border: none; border-radius: var(--radius); padding: 8px 8px; cursor: pointer;
  font: inherit; color: var(--gray-text); transition: background-color 0.1s var(--ease);
}
.add-menu-item:hover { background: var(--bg-panel-raised); }
.add-menu-item-icon { position: relative; width: 24px; height: 24px; flex-shrink: 0; }
.add-menu-item-logo { width: 24px; height: 24px; display: block; color: var(--cyan); transition: transform 0.16s var(--ease); }
.add-menu-item-logo-spoke { color: var(--accent); }
.add-menu-item:hover .add-menu-item-logo { transform: rotate(-6deg) scale(1.05); }
.add-menu-item-text { display: flex; flex-direction: column; gap: 1px; }
.add-menu-item-title { font-size: 12px; font-weight: 700; }
.add-menu-item-sub { font-size: 10px; font-weight: 400; color: var(--gray-muted); }

.context-menu {
  position: fixed; z-index: 200; min-width: 190px;
  background: var(--bg-panel); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); padding: 4px; font-size: 12px;
}
.context-menu-item {
  display: block; width: 100%; text-align: left; background: none; border: none;
  border-radius: var(--radius); padding: 7px 10px; cursor: pointer; font: inherit;
  color: var(--gray-text); transition: background-color 0.1s var(--ease);
}
.context-menu-item:hover:not(:disabled) { background: var(--bg-panel-raised); }
.context-menu-item:disabled { color: var(--gray-faint); cursor: not-allowed; }
.context-menu-item-danger { color: var(--red); }
.context-menu-item-danger:hover:not(:disabled) { background: var(--red-pale); }
.context-menu-sep { height: 1px; margin: 4px 6px; background: var(--border); }
.tree-list { list-style: none; margin: 0; padding: 4px 0 8px; overflow-y: auto; flex: 1; }

.tree-group-header {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 10px 4px; margin-top: 4px;
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--gray-faint); cursor: pointer; user-select: none;
}
.tree-group-header:first-child { margin-top: 0; }
.tree-group-header:hover { color: var(--gray-muted); }
.tree-group-header.selected { background: rgba(0, 136, 163, 0.08); color: var(--cyan-dim); }
.tree-group-toggle {
  display: inline-block; transition: transform 0.15s var(--ease); font-size: 9px;
}
.tree-group-header.collapsed .tree-group-toggle { transform: rotate(-90deg); }
.tree-group-count { margin-left: auto; background: var(--bg-inset); color: var(--gray-muted); border-radius: 0; padding: 0 6px; font-weight: 700; border: 1px solid var(--border); }
.tree-group-body { transition: none; }
.tree-group-body.collapsed { display: none; }
.tree-section-label {
  padding: 10px 10px 2px; margin-top: 8px; font-size: 9px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em; color: var(--gray-faint);
  border-top: 1px solid var(--border-soft);
}
.spoke-group-header .tree-group-spoke-name { text-transform: none; font-size: 11px; letter-spacing: 0; color: var(--gray-text); font-weight: 600; }
.spoke-group-header .status-pill { font-size: 9px; padding: 1px 6px; }
.tree-item-empty { padding: 6px 10px 6px 22px; font-size: 11px; color: var(--gray-faint); font-style: italic; }

.tree-item {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 10px 6px 22px; cursor: pointer; border-left: 3px solid transparent;
  transition: background-color 0.1s var(--ease), border-color 0.1s var(--ease);
  position: relative;
}
.tree-item:hover { background: var(--bg-panel-raised); }
.tree-item.selected { background: rgba(255, 106, 0, 0.06); border-left-color: var(--accent); }
.tree-item-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 12px; }
.tree-item-kind { font-size: 10px; color: var(--gray-muted); }
.tree-item-pin {
  opacity: 0; font-size: 12px; color: var(--gray-faint); padding: 0 2px; line-height: 1;
  transition: opacity 0.1s var(--ease), color 0.1s var(--ease);
}
.tree-item:hover .tree-item-pin, .tree-item-pin.pinned { opacity: 1; }
.tree-item-pin.pinned { color: var(--accent); }
.tree-item-pin:hover { color: var(--accent-dim); transform: scale(1.15); }

.status-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; background: var(--gray-status); transition: background-color 0.2s var(--ease); }
.status-dot.running { background: var(--green); box-shadow: 0 0 0 3px var(--green-pale); }
.status-dot.connecting { background: var(--amber); box-shadow: 0 0 0 3px var(--amber-pale); animation: pulseWarn 1.4s ease-in-out infinite; }
.status-dot.fault { background: var(--red); box-shadow: 0 0 0 3px var(--red-pale); }
.status-dot.stopped, .status-dot.stopping { background: var(--gray-status); }
@keyframes pulseWarn { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.status-pill {
  font-size: 10px; padding: 2px 8px; border-radius: 0;
  text-transform: uppercase; letter-spacing: 0.05em; font-weight: 700;
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--mono);
}
.status-pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status-pill.running { background: var(--green-pale); color: var(--green); }
.status-pill.connecting { background: var(--amber-pale); color: var(--amber); }
.status-pill.fault { background: var(--red-pale); color: var(--red); }
.status-pill.stopped, .status-pill.stopping { background: var(--gray-status-pale); color: var(--gray-muted); }

/* ---------- Content panel ---------- */
.content-panel { flex: 1; overflow-y: auto; padding: 16px 20px; min-width: 0; background: var(--bg-base); }
.view-fade { animation: viewFade 0.16s var(--ease); }
@keyframes viewFade { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Home / overview dashboard ---------- */
.home-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 4px; }
.home-header h1 { font-size: 17px; margin: 0; text-transform: uppercase; letter-spacing: 0.04em; color: var(--gray-text); }
.home-subtitle { color: var(--gray-muted); font-size: 12px; margin: 2px 0 20px; }

.home-layout { display: flex; gap: 20px; align-items: flex-start; }
.home-main { flex: 1; min-width: 0; }
/* ---------- Section panels: bordered box + header bar, shared by Home, Alarms, Tag Monitor ---------- */
.panel {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); overflow: hidden; margin-bottom: 18px;
}
.panel-header, .alarm-section h2, .home-side-widget-header {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted);
  padding: 8px 14px; margin: 0;
  background: var(--bg-inset); border-bottom: 1px solid var(--border);
}
.panel-body { padding: 14px; }
.panel .tag-grid, .alarm-section .tag-grid { border: none; border-radius: 0; }
.panel .tag-monitor-toolbar { margin: 0; padding: 8px 14px; background: var(--bg-inset); border-bottom: 1px solid var(--border); }

.home-side { width: 260px; flex-shrink: 0; display: flex; flex-direction: column; gap: 14px; }
.home-side-widget {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); padding: 12px 14px; overflow: hidden;
}
.home-side-widget-header { margin: -12px -14px 10px; }
.home-side-widget-header a { font-size: 11px; font-weight: 600; color: var(--cyan-dim); text-decoration: none; }
.home-side-widget-header a:hover { text-decoration: underline; }
.home-side-widget-total {
  background: var(--bg-inset); color: var(--gray-muted); border-radius: 0; border: 1px solid var(--border);
  padding: 0 6px; font-size: 11px; font-weight: 700;
}
.home-side-row { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--gray-muted); padding: 3px 0; }
.home-side-row-click { cursor: pointer; margin: 0 -14px; padding: 4px 14px; transition: background-color 0.1s var(--ease); }
.home-side-row-click:hover { background: var(--bg-panel-raised); }
.home-side-count { font-weight: 700; color: var(--gray-text); font-family: var(--mono); }
.home-side-count.count-good { color: var(--green); }
.home-side-count.count-bad { color: var(--red); }
.home-side-count.count-warn { color: var(--amber); }
.home-side-empty { font-size: 11.5px; color: var(--gray-faint); font-style: italic; }

.home-summary-row { display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.home-summary-tile {
  background: var(--bg-panel); border: 1px solid var(--border); border-left: 3px solid var(--border-strong); border-radius: var(--radius);
  padding: 10px 16px; min-width: 108px; box-shadow: var(--shadow-sm);
}
.home-summary-tile-value { font-size: 22px; font-weight: 700; line-height: 1.1; font-family: var(--mono); color: var(--gray-text); }
.home-summary-tile-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted); margin-top: 2px; }
.home-summary-tile.tile-running { border-left-color: var(--green); }
.home-summary-tile.tile-running .home-summary-tile-value { color: var(--green); }
.home-summary-tile.tile-fault { border-left-color: var(--red); }
.home-summary-tile.tile-fault .home-summary-tile-value { color: var(--red); }
.home-summary-tile.tile-stopped .home-summary-tile-value { color: var(--gray-muted); }

.home-health-row { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.home-health-tile {
  background: var(--bg-panel); color: var(--gray-text); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius);
  padding: 12px 18px; min-width: 150px; flex: 1; box-shadow: var(--shadow-sm);
}
.home-health-tile-value { font-size: 24px; font-weight: 700; line-height: 1.1; color: var(--accent-dim); font-family: var(--mono); }
.home-health-tile-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted); margin-top: 3px; }
.home-health-tile-sub { font-size: 10px; color: var(--gray-faint); margin-top: 4px; }

.plc-card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px;
}
.plc-card {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius);
  border-left: 4px solid var(--gray-status); box-shadow: var(--shadow-sm);
  padding: 13px 15px; cursor: pointer;
  transition: transform 0.12s var(--ease), box-shadow 0.12s var(--ease), border-color 0.12s var(--ease);
}
.plc-card:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.plc-card.state-running { border-left-color: var(--green); }
.plc-card.state-fault { border-left-color: var(--red); }
.plc-card.state-connecting { border-left-color: var(--amber); }
.plc-card.state-stopped, .plc-card.state-stopping { border-left-color: var(--gray-status); }
.plc-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.plc-card-name { font-weight: 700; font-size: 13.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); color: var(--gray-text); }
.plc-card-meta { color: var(--gray-muted); font-size: 11px; margin-bottom: 10px; }
.plc-card-spoke-badge { color: var(--cyan-dim); font-weight: 600; }
.plc-card-stats { display: flex; gap: 14px; font-size: 11px; color: var(--gray-muted); }
.plc-card-stat-value { font-weight: 700; color: var(--gray-text); font-size: 13px; display: block; font-family: var(--mono); }
.plc-card-footer { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border-soft); font-size: 10.5px; color: var(--gray-faint); display: flex; justify-content: space-between; }
.plc-card-error { color: var(--red); font-size: 10.5px; margin-top: 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.plc-view-header { display: flex; align-items: center; gap: 12px; }
.plc-view-header h1 { font-size: 17px; margin: 0; font-family: var(--mono); color: var(--gray-text); }
.plc-view-meta { color: var(--gray-muted); font-size: 12px; margin: 4px 0 16px; display: flex; align-items: center; gap: 10px; }
.plc-view-meta-sep { color: var(--border-strong); }
.plc-view-meta-spoke { color: var(--cyan-dim); font-weight: 600; }

.tag-monitor-toolbar { display: flex; align-items: center; justify-content: space-between; margin: 20px 0 8px; }
.tag-monitor-toolbar h2 { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted); margin: 0; font-weight: 700; }
.tag-monitor-toolbar-right { display: flex; align-items: center; gap: 8px; }
.tag-filter-input {
  padding: 5px 9px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 12px; width: 200px; background: var(--bg-panel); color: var(--gray-text);
  transition: border-color 0.1s var(--ease), box-shadow 0.1s var(--ease);
}
.tag-filter-input:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-glow); }

.tag-grid { width: 100%; border-collapse: collapse; background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.tag-grid th {
  background: var(--bg-inset); color: var(--gray-muted);
  text-align: left; font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 700;
  padding: 7px 10px; border-bottom: 1px solid var(--border);
}
.tag-grid td { padding: 6px 10px; border-bottom: 1px solid var(--border-soft); transition: background-color 0.1s var(--ease); color: var(--gray-text); }
.tag-grid tbody tr:nth-child(even):not(.tag-section-row) { background: rgba(16, 24, 32, 0.015); }
.tag-grid tbody tr:hover:not(.tag-section-row) { background: rgba(0, 136, 163, 0.06); cursor: pointer; }
.tag-value { font-family: var(--mono); font-weight: 700; color: var(--gray-text); }
.tag-value.stale { color: var(--gray-muted); font-weight: 400; font-style: italic; }
.tag-value.fault { color: var(--red); }
.tag-grid tbody tr.fault { background: var(--red-pale); }
.tag-grid tbody tr.fault:hover { background: rgba(209, 60, 46, 0.18); }
.tag-error-badge {
  font-size: 9px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--red); background: var(--red-pale); border-radius: 0; padding: 1px 5px; margin-left: 6px;
}
.tag-age { color: var(--gray-muted); font-size: 11px; }
.tag-grid th:first-child, .tag-grid td:first-child { width: 26px; text-align: center; }
.tag-alarm-badge { color: var(--amber); margin-left: 4px; cursor: default; }

.tag-type-chip {
  font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: 0.02em;
  padding: 1px 6px; border-radius: 0; display: inline-block;
}

.tag-sparkline-cell { width: 78px; }
.tag-sparkline { display: block; width: 70px; height: 22px; }

.tag-section-row td {
  background: var(--bg-inset) !important; padding: 5px 10px; font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-muted);
  border-bottom: 1px solid var(--border); cursor: pointer; user-select: none;
}
.tag-section-row:hover td { color: var(--cyan-dim); }
.tag-section-toggle { display: inline-block; margin-right: 6px; transition: transform 0.15s var(--ease); font-size: 9px; }
.tag-section-row.collapsed .tag-section-toggle { transform: rotate(-90deg); }
.tag-section-row-count { color: var(--gray-faint); font-weight: 400; text-transform: none; letter-spacing: 0; margin-left: 4px; }
.tag-row.section-collapsed { display: none; }

/* ---------- Skeleton loading ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--border-soft) 25%, var(--border) 37%, var(--border-soft) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: 0; display: inline-block;
}
@keyframes shimmer { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
.skeleton-line { height: 10px; width: 100%; }
.skeleton-row td { padding: 8px 10px; }

/* ---------- Inspector panel ---------- */
.inspector-panel {
  width: 340px; flex-shrink: 0; background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
}
.inspector-panel[hidden] { display: none; }

.inspector-tabs { display: flex; border-bottom: 1px solid var(--border); flex-shrink: 0; background: var(--bg-inset); }
.inspector-tab {
  flex: 1; background: none; border: none; padding: 9px 6px; font-size: 10.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em; color: var(--gray-muted);
  border-bottom: 2px solid transparent; position: relative;
}
.inspector-tab:hover:not(:disabled) { color: var(--cyan-dim); background: rgba(0, 136, 163, 0.05); }
.inspector-tab.active { color: var(--cyan-dim); border-bottom-color: var(--cyan); background: var(--bg-panel); }
.inspector-tab-dot {
  position: absolute; top: 6px; right: 14px; width: 6px; height: 6px; border-radius: 50%; background: var(--amber);
}
.inspector-tabpanel { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
.inspector-tabpanel[hidden] { display: none; }

.inspector-section { padding: 13px 15px; border-bottom: 1px solid var(--border-soft); }
.inspector-section-header {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--gray-muted); margin-bottom: 9px;
}
.inspector-fields { margin: 0; }
.inspector-fields dt { font-size: 11px; color: var(--gray-muted); margin-top: 9px; }
.inspector-fields dt:first-child { margin-top: 0; }
.inspector-fields dd { margin: 2px 0 0; font-size: 13px; font-family: var(--mono); color: var(--gray-text); }
.inspector-error-text { color: var(--red); font-family: var(--sans); font-size: 12px; }

.inspector-trend-wrap { margin: 10px 0 2px; border: 1px solid var(--border); border-radius: var(--radius); padding: 8px; background: var(--bg-inset); }
.inspector-trend-label { font-size: 10px; color: var(--gray-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.inspector-trend-canvas { display: block; width: 100%; height: 54px; }
.inspector-trend-empty { font-size: 11px; color: var(--gray-faint); text-align: center; padding: 14px 0; }

.inspector-alarm-section { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border-soft); }
.inspector-alarm-header {
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--gray-muted); margin-bottom: 8px;
}
.inspector-alarm-check { display: flex; align-items: center; gap: 6px; font-size: 12px; margin-bottom: 6px; }
.inspector-alarm-check input { width: auto; margin: 0; }
.inspector-alarm-label-input {
  width: 100%; padding: 5px 8px; margin: 2px 0 8px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 12px; background: var(--bg-panel); color: var(--gray-text);
}

.inspector-empty { color: var(--gray-faint); font-size: 12px; padding: 30px 15px; text-align: center; }

.activity-feed { list-style: none; margin: 0; padding: 0; }
.activity-feed li {
  display: flex; align-items: baseline; gap: 6px; padding: 6px 0;
  border-bottom: 1px solid var(--border-soft); font-size: 12px;
}
.activity-feed li:last-child { border-bottom: none; }
.activity-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; background: var(--gray-status); }
.activity-dot-good { background: var(--green); }
.activity-dot-bad { background: var(--red); }
.activity-dot-neutral { background: var(--gray-status); }
.activity-dot-info { background: var(--cyan); }
.activity-msg { flex: 1; color: var(--gray-text); }
.activity-time { color: var(--gray-muted); font-size: 10px; white-space: nowrap; }
.activity-empty { color: var(--gray-muted); font-style: italic; font-size: 12px; }

/* ---------- Toasts ---------- */
.toast-container {
  /* Below the topbar (~43px tall), not on top of its alarm/fleet/audit/user icons. */
  position: fixed; top: 56px; right: 16px; z-index: 200;
  display: flex; flex-direction: column; gap: 8px; width: 300px; max-width: calc(100vw - 32px);
}
.toast {
  display: flex; align-items: flex-start; gap: 9px;
  background: var(--bg-panel); border: 1px solid var(--border); border-left: 3px solid var(--cyan);
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  padding: 10px 12px; font-size: 12px; color: var(--gray-text);
  animation: toastIn 0.2s var(--ease);
}
.toast.leaving { animation: toastOut 0.16s var(--ease) forwards; }
@keyframes toastIn { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toastOut { to { opacity: 0; transform: translateX(24px) scale(0.96); } }
.toast-icon { font-size: 14px; line-height: 1.3; flex-shrink: 0; }
.toast-body { flex: 1; }
.toast-title { font-weight: 700; margin-bottom: 1px; text-transform: uppercase; font-size: 11px; letter-spacing: 0.03em; }
.toast-msg { color: var(--gray-muted); }
.toast-close { background: none; border: none; color: var(--gray-faint); font-size: 13px; padding: 0 0 0 4px; line-height: 1; }
.toast-close:hover { color: var(--gray-text); }
.toast.toast-success { border-left-color: var(--green); }
.toast.toast-success .toast-icon { color: var(--green); }
.toast.toast-error { border-left-color: var(--red); }
.toast.toast-error .toast-icon { color: var(--red); }
.toast.toast-info { border-left-color: var(--cyan); }
.toast.toast-info .toast-icon { color: var(--cyan); }

/* ---------- Command palette ---------- */
.cmdk-backdrop {
  position: fixed; inset: 0; background: rgba(16, 20, 24, 0.35);
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 12vh; z-index: 120;
}
.cmdk-backdrop[hidden] { display: none; }
.cmdk-box {
  width: 560px; max-width: 90vw; background: var(--bg-panel); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); border: 1px solid var(--border-strong); overflow: hidden;
  animation: cmdkIn 0.14s var(--ease);
}
@keyframes cmdkIn { from { opacity: 0; transform: translateY(-8px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
.cmdk-input-row { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-bottom: 1px solid var(--border); }
.cmdk-input-icon { color: var(--gray-faint); font-size: 14px; }
.cmdk-input {
  flex: 1; border: none; outline: none; background: none; font-size: 15px; color: var(--gray-text); font-family: var(--mono);
}
.cmdk-input::placeholder { color: var(--gray-faint); }
.cmdk-esc-hint { font-size: 10px; color: var(--gray-faint); border: 1px solid var(--border); border-radius: var(--radius); padding: 1px 5px; }
.cmdk-results { max-height: 340px; overflow-y: auto; padding: 6px; }
.cmdk-group-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-faint); font-weight: 700; padding: 8px 10px 4px; }
.cmdk-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: var(--radius);
  cursor: pointer; font-size: 13px;
}
.cmdk-item.active { background: rgba(0, 136, 163, 0.08); }
.cmdk-item-icon { width: 18px; text-align: center; flex-shrink: 0; }
.cmdk-item-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cmdk-item-hint { font-size: 10px; color: var(--gray-faint); }
.cmdk-empty { padding: 24px 10px; text-align: center; color: var(--gray-faint); font-size: 12px; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(16, 20, 24, 0.4);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  background: var(--bg-panel); border-radius: var(--radius-lg); width: 460px; max-width: 90vw;
  padding: 18px 20px; box-shadow: var(--shadow-lg); border: 1px solid var(--border-strong);
  animation: cmdkIn 0.15s var(--ease);
}
.modal.modal-wide { width: 680px; }
.modal h2 { margin-top: 0; font-size: 14px; color: var(--gray-text); text-transform: uppercase; letter-spacing: 0.03em; }
.modal label, #spoke-view label { display: block; margin-bottom: 10px; font-size: 12px; color: var(--gray-muted); }
.modal input, .modal select, .modal textarea,
#spoke-view input, #spoke-view select, #spoke-view textarea {
  width: 100%; padding: 6px 8px; margin-top: 3px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg-panel); color: var(--gray-text);
  transition: border-color 0.1s var(--ease), box-shadow 0.1s var(--ease);
  font-family: var(--sans);
}
.modal input:focus, .modal select:focus, .modal textarea:focus,
#spoke-view input:focus, #spoke-view select:focus, #spoke-view textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-glow); }
.modal h3.modal-subheading { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gray-muted); margin: 16px 0 8px; }
.modal-list { list-style: none; margin: 0 0 10px; padding: 0; max-height: 160px; overflow-y: auto; }
.modal-list li { padding: 4px 0; border-bottom: 1px solid var(--border-soft); font-size: 12px; }
.modal-list li:last-child { border-bottom: none; }
.modal-token-box {
  background: var(--bg-inset); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 12px; margin: 10px 0; font-family: var(--mono); font-size: 12px; word-break: break-all; color: var(--cyan-dim);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.modal-error { background: var(--red-pale); border: 1px solid var(--red); color: var(--red); padding: 6px 10px; border-radius: var(--radius); font-size: 12px; margin-bottom: 10px; }
.modal-hint { color: var(--gray-muted); font-size: 11px; margin: -4px 0 12px; }
.modal-hint-inline { font-weight: 400; text-transform: none; letter-spacing: 0; color: var(--gray-faint); font-size: 10px; }
.group-move-select { width: auto; padding: 3px 6px; font-size: 11px; }
.modal-loading { color: var(--gray-muted); font-size: 12px; padding: 10px 0; }
.modal-diag-header { display: flex; align-items: center; justify-content: space-between; }
.modal-diag-header h3.modal-subheading { margin: 16px 0 8px; }
.modal-diag { display: flex; flex-direction: column; gap: 6px; margin-bottom: 4px; }
.modal-diag-row { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.modal-diag-label { min-width: 110px; color: var(--gray-muted); }
.modal-diag-detail { color: var(--gray-text); }
.modal-diag-hint { margin-top: 10px; }
.modal-inline-form:not([hidden]) { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; margin: 4px 0 12px; }
.modal-inline-form label { font-size: 11px; }
.modal-list-row { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.modal-grant-row { padding-top: 6px; padding-bottom: 6px; }
.modal-grant-meta { display: flex; align-items: center; gap: 6px; margin-top: 3px; flex-wrap: wrap; }
.modal-grant-live { font-size: 10px; color: var(--gray-muted); }
.modal-field-hint { color: var(--gray-muted); font-size: 11px; margin: -6px 0 12px; }
.modal-device-key { margin-top: 4px; }
.modal-key-chip { font-family: var(--mono); font-size: 11px; background: var(--bg-inset); border: 1px solid var(--border); border-radius: var(--radius); padding: 1px 5px; }
.modal-checkbox { display: flex; align-items: center; gap: 6px; }
.modal-checkbox input { width: auto; margin: 0; }

.browse-section { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; }
.browse-header {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  background: var(--bg-inset); padding: 6px 8px; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em; color: var(--gray-muted);
}
.browse-header .tag-filter-input { width: 140px; margin: 0; }
.browse-list { max-height: 180px; overflow-y: auto; }
.browse-status { padding: 12px 10px; color: var(--gray-muted); font-size: 12px; text-align: center; }
.browse-status-error { color: var(--red); }
.browse-item {
  display: flex; align-items: center; gap: 8px; padding: 5px 10px; cursor: pointer;
  font-size: 12px; border-bottom: 1px solid var(--border-soft);
}
.browse-item:last-child { border-bottom: none; }
.browse-item:hover { background: rgba(0, 136, 163, 0.06); }
.browse-item-name { flex: 1; font-family: var(--mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.browse-item-type { color: var(--gray-muted); font-size: 10px; white-space: nowrap; }
.browse-item-added { opacity: 0.5; }
.browse-item-badge {
  font-size: 9px; text-transform: uppercase; background: var(--bg-inset); color: var(--gray-muted);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 1px 4px; margin-left: 4px;
}
.browse-item input[type="checkbox"] { width: auto; margin: 0; flex-shrink: 0; }
.browse-bulk-actions {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 6px 8px; background: var(--bg-inset); border-top: 1px solid var(--border);
}
.browse-bulk-hint { margin: 0; flex: 1; }

.register-search-controls { display: flex; gap: 6px; padding: 8px; background: var(--bg-inset); border-bottom: 1px solid var(--border); }
.register-search-controls input {
  width: auto; flex: 1; padding: 5px 8px; margin: 0; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 12px; background: var(--bg-panel); color: var(--gray-text);
}
.register-row { cursor: default; gap: 14px; flex-wrap: wrap; }
.register-option { display: flex; align-items: center; gap: 4px; }
.register-option input[type="checkbox"] { width: auto; margin: 0; }
.register-option-empty { color: var(--gray-muted); font-size: 11px; }
.register-value {
  font-family: var(--mono); font-size: 11px; padding: 2px 6px; border-radius: var(--radius);
  cursor: pointer; border: 1px solid transparent; color: var(--gray-text);
}
.register-value:hover { background: rgba(0, 136, 163, 0.1); border-color: var(--cyan); }
.register-option.browse-item-added .register-value { opacity: 0.5; }
.register-name-input {
  width: 110px !important; padding: 2px 6px !important; margin: 0 !important;
  font-size: 11px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-panel); color: var(--gray-text);
}

/* ---------- Login ---------- */
.login-body {
  display: flex; align-items: center; justify-content: center; height: 100vh;
  background:
    linear-gradient(var(--border-soft) 1px, transparent 1px) 0 0 / 100% 32px,
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px) 0 0 / 32px 100%,
    var(--bg-void);
}
.login-card {
  background: var(--bg-panel); border: 1px solid var(--border); border-top: 3px solid var(--accent); border-radius: var(--radius-lg);
  padding: 30px 34px; width: 320px; box-shadow: var(--shadow-lg);
}
.login-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; font-weight: 700; font-size: 15px; color: var(--gray-text); text-transform: uppercase; letter-spacing: 0.04em; }
.login-logo-mark { display: block; width: 32px; height: 32px; }
.login-logo-caption { display: block; margin-bottom: 22px; font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em; color: var(--gray-muted); text-transform: uppercase; }
.login-form label { display: block; margin-bottom: 12px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--gray-muted); }
.login-form input {
  width: 100%; padding: 7px 9px; margin-top: 4px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg-panel); color: var(--gray-text);
  transition: border-color 0.1s var(--ease), box-shadow 0.1s var(--ease);
}
.login-form input:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-glow); }
.login-error { background: var(--red-pale); border: 1px solid var(--red); color: var(--red); padding: 8px 10px; border-radius: var(--radius); font-size: 12px; margin-bottom: 14px; }

/* ---------- Fleet alarms ---------- */
.alarm-bell { position: relative; font-size: 13px; }
.alarm-badge {
  position: absolute; top: -5px; right: -5px; min-width: 15px; height: 15px; padding: 0 3px;
  background: var(--red); color: #fff; border-radius: 8px; font-size: 9px; font-weight: 700;
  line-height: 15px; text-align: center;
}
.alarms-view { max-width: 1200px; }
.alarm-all-clear {
  margin-top: 24px; padding: 14px 16px; background: var(--green-pale); border: 1px solid var(--green); color: var(--green);
  border-radius: var(--radius); font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
}
.alarm-section {
  margin-top: 20px; background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); overflow: hidden;
}
.alarm-section .tag-grid { margin: 12px 14px; width: calc(100% - 28px); }
.alarm-section-empty {
  margin: 12px 14px; padding: 10px 12px; background: var(--bg-inset); border: 1px solid var(--border-soft);
  border-radius: var(--radius); color: var(--gray-muted); font-size: 12px;
}
.alarm-table td:first-child { width: 40%; }
.alarm-table td:last-child { width: 140px; color: var(--gray-muted); font-size: 11px; }
.alarm-row-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 8px; }
.alarm-row-dot.fault { background: var(--red); }
.alarm-row-dot.connecting { background: var(--amber); }
.alarm-row-dot.running { background: var(--green); }

/* ---------- Responsive: tablet and phone (plant-floor use is plausible) ---------- */
@media (max-width: 900px) {
  .topbar { flex-wrap: wrap; row-gap: 8px; }
  .topbar-toolbar {
    order: 3; flex-basis: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;
    padding-bottom: 2px; scrollbar-width: none;
  }
  .topbar-toolbar::-webkit-scrollbar { display: none; }
  .layout { flex-direction: column; }
  .tree-panel { width: 100%; max-height: 200px; border-right: none; border-bottom: 1px solid var(--border); }
  .inspector-panel {
    position: fixed; inset: auto 0 0 0; width: 100%; max-height: 75vh;
    border-left: none; border-top: 1px solid var(--border-strong); box-shadow: var(--shadow-lg); z-index: 100;
  }
  .home-layout { flex-direction: column; }
  .home-side { width: 100%; }
  .content-panel { padding: 12px; }
  .plc-view-header { flex-wrap: wrap; }
  .toast-container { top: 96px; } /* topbar wraps to two rows at this width */
}

@media (max-width: 560px) {
  .tree-panel { max-height: 150px; }
  .topbar-user { font-size: 10px; gap: 6px; }
  .topbar-brand span { display: none; } /* logo alone is enough on a phone-width topbar */
  .modal, .modal.modal-wide { width: calc(100vw - 24px); }
  .plc-card-grid { grid-template-columns: 1fr; }
}