/* ─────────────────────────────────────────────────────────────────
 * TreeGuard screens — app shell (sidebar + subrail + content)
 * ───────────────────────────────────────────────────────────────── */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w-col) 0px var(--subrail-w) 1fr;
  transition: grid-template-columns 220ms cubic-bezier(.4,.0,.2,1);
  min-height: 100vh;
}
/* When the filters panel is open, column 2 expands and pushes the
   subrail + main column to the right. The primary sidebar (col 1)
   stays put with the highest z-index. */
.app.filters-open {
  grid-template-columns: var(--sidebar-w-col) 320px var(--subrail-w) 1fr;
}

/* ── Primary sidebar (collapsed, 64px — tree-guard context) ─────── */
.sidenav {
  position: relative; z-index: 100;
  background: var(--bg-sidenav);
  border-right: 1px solid #0C0F12;
  display: flex; flex-direction: column;
  padding: 14px 0;
}
.sidenav .mark {
  width: 40px; height: 40px; margin: 0 auto 20px;
  background: var(--brand-500);
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  color: #fff;
  font: 700 18px/1 var(--font-sans);
}
.sidenav .nav { display: flex; flex-direction: column; gap: 4px; padding: 0 12px; }
.sidenav .nav-item {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s;
  position: relative;
}
.sidenav .nav-item:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.sidenav .nav-item.active {
  background: var(--brand-bg);
  color: var(--brand-500);
  border: 1px solid var(--brand-border);
}
.sidenav .nav-item svg { width: 18px; height: 18px; }
.sidenav .bottom { margin-top: auto; padding: 0 12px; display: flex; flex-direction: column; gap: 4px; }
.sidenav .avatar {
  width: 32px; height: 32px; margin: 8px auto 0;
  border-radius: 50%; background: #4A515D;
  display: grid; place-items: center;
  font: 500 12px/1 var(--font-sans); color: #fff;
}

/* ── Subrail (48px — module/view switcher) ────────────────────── */
.subrail {
  position: relative; z-index: 30;
  background: var(--bg-sidenav);
  border-right: 1px solid var(--border-subtle);
  display: flex; flex-direction: column;
  padding: 14px 0;
}
.subrail .sr-item {
  width: 32px; height: 32px; margin: 0 auto 6px;
  display: grid; place-items: center;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.subrail .sr-item:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.subrail .sr-item.active {
  background: var(--brand-bg);
  color: var(--brand-500);
  border: 1px solid var(--brand-border);
}
.subrail .sr-item svg { width: 16px; height: 16px; }
.subrail .sep {
  width: 24px; height: 1px;
  background: var(--border-subtle);
  margin: 8px auto;
}

/* ── Top bar ────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border-subtle);
}
.topbar .crumb {
  font: var(--t-caption-up);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--brand-500);
  margin-bottom: 4px;
  display: flex; align-items: center; gap: 8px;
}
.topbar .crumb .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--brand-500);
}
.topbar h1 { font: var(--t-h1); margin: 0; color: var(--text-primary); }

.topbar .actions { display: flex; align-items: center; gap: 8px; }

/* ── Shared utility ─────────────────────────────────────────── */
.btn {
  font: var(--t-label);
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  display: inline-flex; align-items: center; gap: 8px;
  transition: background 0.12s ease, border-color 0.12s ease;
  background: transparent; color: var(--text-primary);
  text-decoration: none;
}
.btn-primary { background: var(--brand-500); color: #fff; }
.btn-primary:hover { background: var(--brand-400); }
.btn-ghost { border-color: var(--border-default); }
.btn-ghost:hover { border-color: var(--border-strong); background: rgba(255,255,255,0.02); }

.btn svg { width: 14px; height: 14px; }

/* Badge */
.badge {
  font: var(--t-data-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  white-space: nowrap;
}
.badge-alarm  { background: var(--status-alarm-bg);  color: var(--status-alarm); }
.badge-alert  { background: var(--status-alert-bg);  color: var(--status-alert); }
.badge-stable { background: var(--status-stable-bg); color: var(--status-stable); }

.chip-link {
  font: var(--t-data-xs);
  color: var(--brand-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
}
.chip-link:hover { color: var(--brand-300); }

/* Card shell used by most panels */
.panel {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}
.panel-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}
.panel-hdr h3 { margin: 0; font: var(--t-h3); color: var(--text-primary); }
.panel-hdr .hint { font: var(--t-caption); color: var(--text-muted); }

/* ── Span info popover (shown on map view when a conductor span is clicked) ── */
.span-popover {
  position: absolute;
  z-index: 25;
  width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--brand-500);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  padding: 14px 16px;
  pointer-events: auto;
}
.span-popover .sp-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 10px; padding-bottom: 10px; margin-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}
.span-popover .sp-head .title {
  display: flex; flex-direction: column; gap: 3px;
  font-family: var(--font-mono); min-width: 0;
}
.span-popover .sp-head .name {
  font: 500 13px/1.3 var(--font-mono);
  color: var(--text-primary);
}
.span-popover .sp-head .designation {
  font: 400 10px/1.4 var(--font-mono);
  color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.span-popover .sp-head .close-btn {
  background: transparent; border: none; cursor: pointer;
  color: var(--text-muted); font-size: 16px; line-height: 1;
  padding: 2px 4px; margin: -2px -4px 0 0;
  flex-shrink: 0;
}
.span-popover .sp-head .close-btn:hover { color: var(--text-primary); }

.span-popover .sp-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font: 500 10px/1 var(--font-sans);
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 5px 9px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}
.span-popover .sp-pill.alarm  { background: var(--status-alarm-bg);  color: var(--status-alarm); }
.span-popover .sp-pill.alert  { background: var(--status-alert-bg);  color: var(--status-alert); }
.span-popover .sp-pill.stable { background: var(--status-stable-bg); color: var(--status-stable); }

.span-popover .sp-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 5px 0;
  font: 400 12px/1.4 var(--font-sans);
}
.span-popover .sp-row .k { color: var(--text-muted); }
.span-popover .sp-row .v { color: var(--text-primary); font-family: var(--font-mono); font-size: 12px; }
.span-popover .sp-row .v.alarm  { color: var(--status-alarm); }
.span-popover .sp-row .v.alert  { color: var(--status-alert); }
.span-popover .sp-row .v.stable { color: var(--status-stable); }

.span-popover .sp-foot {
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
  display: flex; gap: 8px; flex-wrap: wrap;
}
.span-popover .sp-foot a {
  font: 500 11px/1 var(--font-sans);
  letter-spacing: 0.04em;
  color: var(--brand-400);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px 10px;
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm);
  transition: background 120ms;
}
.span-popover .sp-foot a:hover {
  background: var(--brand-bg);
}