/* ========================================================
   InfraWatch — Design System
   ======================================================== */

:root {
  /* Sidebar */
  --sb-bg: #0F172A;
  --sb-border: rgba(255, 255, 255, 0.06);
  --sb-text: #94A3B8;
  --sb-text-hover: #CBD5E1;
  --sb-text-active: #F1F5F9;
  --sb-active-bg: rgba(59, 130, 246, 0.15);
  --sb-active-border: #3B82F6;
  --sb-hover-bg: rgba(255, 255, 255, 0.06);

  /* Surface */
  --bg: #F1F5F9;
  --card: #FFFFFF;

  /* Text */
  --text: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;

  /* Borders */
  --border: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Brand */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-border: #BFDBFE;

  /* Status */
  --success: #059669;
  --success-bg: #ECFDF5;
  --success-border: #6EE7B7;
  --success-text: #065F46;

  --danger: #DC2626;
  --danger-bg: #FEF2F2;
  --danger-border: #FECACA;
  --danger-text: #991B1B;

  --warning: #D97706;
  --warning-bg: #FFFBEB;
  --warning-border: #FCD34D;
  --warning-text: #92400E;

  /* Elevation */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Helvetica Neue", sans-serif;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ========================================================
   App Shell
   ======================================================== */

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ========================================================
   Sidebar
   ======================================================== */

.sidebar {
  width: 240px;
  min-height: 100vh;
  background: var(--sb-bg);
  border-right: 1px solid var(--sb-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  transition: width 0.22s ease;
  flex-shrink: 0;
  scrollbar-width: none;
}

.sidebar::-webkit-scrollbar { display: none; }

.sidebar-collapsed .sidebar { width: 64px; }

.sidebar-header {
  display: flex;
  align-items: center;
  padding: 0 0.875rem;
  gap: 0.625rem;
  border-bottom: 1px solid var(--sb-border);
  height: 60px;
  flex-shrink: 0;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 100%);
  color: #fff;
  font-weight: 700;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: -0.02em;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.brand-text {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.brand-name {
  font-weight: 700;
  color: #F8FAFC;
  font-size: 0.9375rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
}

.brand-sub {
  font-size: 0.6875rem;
  color: var(--sb-text);
  white-space: nowrap;
}

.sidebar-toggle-btn {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--sb-text);
  cursor: pointer;
  padding: 0.3125rem;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
  color: var(--sb-text-active);
  background: var(--sb-hover-bg);
}

.sidebar-toggle-btn svg { width: 18px; height: 18px; }

.sidebar-nav {
  flex: 1;
  padding: 0.625rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.nav-section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--sb-text);
  opacity: 0.55;
  padding: 0.625rem 0.5rem 0.25rem;
  white-space: nowrap;
  overflow: hidden;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5625rem 0.625rem;
  border-radius: var(--radius-sm);
  color: var(--sb-text);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s ease;
  border-left: 2px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  flex-shrink: 0;
}

.nav-item:hover {
  color: var(--sb-text-hover);
  background: var(--sb-hover-bg);
  text-decoration: none;
}

.nav-item.active {
  color: var(--sb-text-active);
  background: var(--sb-active-bg);
  border-left-color: var(--sb-active-border);
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.85;
}

.nav-icon svg { width: 18px; height: 18px; }

.nav-separator {
  height: 1px;
  background: var(--sb-border);
  margin: 0.375rem 0;
  flex-shrink: 0;
}

.nav-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 0.5rem 0.75rem;
  border-top: 1px solid var(--sb-border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.nav-danger { color: #FCA5A5; }
.nav-danger:hover { color: #FEE2E2; background: rgba(239, 68, 68, 0.1); }

/* Collapsed state */
.sidebar-collapsed [data-sidebar-text] { display: none; }
.sidebar-collapsed .nav-section-label { visibility: hidden; }

/* ========================================================
   Main
   ======================================================== */

.main-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: 60px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 10;
  flex-shrink: 0;
}

.main-content { flex: 1; }

.page {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
}

.page-header { margin-bottom: 1.5rem; }

.page-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.page-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

/* ========================================================
   Stat Cards
   ======================================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.375rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card-total::after { background: linear-gradient(90deg, #3B82F6, #60A5FA); }
.stat-card-online::after { background: linear-gradient(90deg, #10B981, #34D399); }
.stat-card-offline::after { background: linear-gradient(90deg, #EF4444, #F87171); }
.stat-card-warning::after { background: linear-gradient(90deg, #F59E0B, #FCD34D); }

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon svg { width: 22px; height: 22px; }
.stat-icon-total { background: #EFF6FF; color: #2563EB; }
.stat-icon-online { background: #ECFDF5; color: #059669; }
.stat-icon-offline { background: #FEF2F2; color: #DC2626; }
.stat-icon-warning { background: #FFFBEB; color: #D97706; }

.stat-body { flex: 1; min-width: 0; }

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========================================================
   Cards
   ======================================================== */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 52px;
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.card-body { padding: 1.25rem; }

/* ========================================================
   Charts
   ======================================================== */

.charts-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.chart-container {
  position: relative;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ========================================================
   Filters / Toolbar
   ======================================================== */

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-wrap: wrap;
  padding: 0.75rem 1.25rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.toolbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.375rem 0.625rem;
  transition: border-color 0.15s;
}

.search-box:focus-within { border-color: var(--primary); }

.search-box svg { width: 15px; height: 15px; color: var(--text-muted); flex-shrink: 0; }

.search-box input {
  border: none;
  background: none;
  outline: none;
  color: var(--text);
  font-size: 0.875rem;
  width: 180px;
  font-family: inherit;
}

.search-box input::placeholder { color: var(--text-muted); }

.filter-select {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  padding: 0.4375rem 0.625rem;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: border-color 0.15s;
}

.filter-select:focus { border-color: var(--primary); }

/* ========================================================
   Table
   ======================================================== */

/* Checkbox column in node list table */
.col-checkbox {
  width: 36px;
  padding-left: 1rem !important;
  padding-right: 0.25rem !important;
}
.col-checkbox input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary);
  cursor: pointer;
  vertical-align: middle;
}

.table-wrapper { overflow-x: auto; }

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table thead th {
  padding: 0.6875rem 1.25rem;
  text-align: left;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table tbody td {
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: middle;
}

.table tbody tr:last-child td { border-bottom: none; }

.table tbody tr:hover td { background: #FAFBFD; }

.cell-strong {
  color: var(--text) !important;
  font-weight: 500;
}

.table-empty {
  padding: 3rem;
  text-align: center;
  color: var(--text-muted);
}

/* ========================================================
   Badges & Tags
   ======================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3125rem;
  padding: 0.2rem 0.5625rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
}

.badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge-online {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}
.badge-online .badge-dot { background: var(--success); }

.badge-offline {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger-border);
}
.badge-offline .badge-dot { background: var(--danger); }

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border-color: var(--warning-border);
}
.badge-warning .badge-dot { background: var(--warning); }

.badge-neutral {
  background: #F1F5F9;
  color: #475569;
  border-color: #CBD5E1;
}
.badge-neutral .badge-dot { background: #94A3B8; }

.badge-blue {
  background: var(--primary-light);
  color: #1D4ED8;
  border-color: var(--primary-border);
}

.tag {
  display: inline-block;
  padding: 0.1875rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: #F1F5F9;
  color: #475569;
  border: 1px solid #E2E8F0;
}

.group-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.1875rem 0.5rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--primary-light);
  color: #1D4ED8;
  border: 1px solid var(--primary-border);
}

/* ========================================================
   Buttons
   ======================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none !important;
  transition: all 0.15s ease;
  white-space: nowrap;
  line-height: 1.25;
  font-family: inherit;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }

.btn-secondary {
  background: var(--card);
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--border-strong); color: var(--text); background: var(--bg); }

.btn-danger-soft {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}
.btn-danger-soft:hover { background: #FEE2E2; }

.btn-success-soft {
  background: var(--success-bg);
  color: var(--success);
  border-color: var(--success-border);
}
.btn-success-soft:hover { background: #D1FAE5; }

.btn-warning-soft {
  background: #FFFBEB;
  color: #B45309;
  border-color: #FDE68A;
}
.btn-warning-soft:hover { background: #FEF3C7; }

.btn-sm {
  padding: 0.3125rem 0.5625rem;
  font-size: 0.8125rem;
}

.btn-sm svg { width: 13px; height: 13px; }

/* Compact submit / action buttons (node forms, settings, etc.) */
.btn-sm-submit {
  padding: 0.4rem 0.875rem;
  font-size: 0.875rem;
}

/* Export — Excel (green) */
.btn-export-excel {
  background: #ECFDF5;
  color: #065F46;
  border-color: #6EE7B7;
}
.btn-export-excel:hover { background: #D1FAE5; border-color: #34D399; }

/* Export — CSV (blue-teal) */
.btn-export-csv {
  background: #EFF6FF;
  color: #1E40AF;
  border-color: #BFDBFE;
}
.btn-export-csv:hover { background: #DBEAFE; border-color: #93C5FD; }

/* Import CSV (amber) */
.btn-import-csv {
  background: #FFFBEB;
  color: #92400E;
  border-color: #FCD34D;
}
.btn-import-csv:hover { background: #FEF3C7; border-color: #FDE68A; }

.btn-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ========================================================
   Forms
   ======================================================== */

.stacked-form {
  display: grid;
  gap: 1rem;
}

.stacked-form > div {
  display: grid;
  gap: 0.375rem;
}

.stacked-form label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.stacked-form input,
.stacked-form textarea,
.stacked-form select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5625rem 0.75rem;
  background: var(--card);
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
  line-height: 1.4;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.stacked-form input:focus,
.stacked-form textarea:focus,
.stacked-form select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}

.stacked-form input::placeholder,
.stacked-form textarea::placeholder {
  color: var(--text-muted);
}

.stacked-form input[type="checkbox"] {
  width: auto;
  accent-color: var(--primary);
  cursor: pointer;
}

.stacked-form > div > ul {
  list-style: none;
  padding: 0;
}

.stacked-form > div > ul li {
  font-size: 0.8125rem;
  color: var(--danger);
  padding: 0.25rem 0;
}

.auth-group {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.auth-group h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

/* ========================================================
   Alerts / Flash
   ======================================================== */

.flash {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.875rem;
  border: 1px solid;
}

.flash svg { width: 16px; height: 16px; flex-shrink: 0; }

.flash-success {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}

.flash-danger {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger-border);
}

.flash-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border-color: var(--warning-border);
}

/* ========================================================
   Auth / Login Page
   ======================================================== */

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #EFF6FF 0%, #F1F5F9 50%, #F0FDF4 100%);
  padding: 1rem;
}

.auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-md);
  width: min(420px, 100%);
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.auth-logo .brand-icon { width: 40px; height: 40px; font-size: 1rem; }

.auth-logo-text strong {
  display: block;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.auth-logo-text small {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.auth-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}

.auth-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.75rem;
}

/* ========================================================
   Misc
   ======================================================== */

.user-chip {
  font-size: 0.8125rem;
  color: var(--sb-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.action-row {
  display: flex;
  gap: 0.375rem;
  align-items: center;
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

.divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.fw-600 { font-weight: 600; }
.mt-1 { margin-top: 0.5rem; }

/* ========================================================
   Responsive
   ======================================================== */

@media (max-width: 1024px) {
  .charts-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    z-index: 100;
    height: 100vh;
    transition: transform 0.25s ease, width 0.25s ease;
  }

  .sidebar-collapsed .sidebar {
    transform: translateX(-100%);
    width: 240px;
  }

  .page { padding: 1rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .toolbar { gap: 0.5rem; }
  .toolbar-actions { margin-left: 0; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 1.5rem 1.25rem; }
}

/* ========================================================
   Node form (Add / Edit) — full-width single column
   ======================================================== */
.node-form-stack {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.node-form .form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.875rem;
}
.node-form-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* Checkbox card layout */
.checkbox-group-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}
.checkbox-group-1col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}
.checkbox-card-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
}
.checkbox-card-row:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.03);
}
.checkbox-card-row label {
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin: 0;
    line-height: 1.4;
}
.checkbox-card-row input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
    accent-color: var(--primary);
    cursor: pointer;
}

@media (max-width: 768px) {
    .node-form .form-grid-2 { grid-template-columns: 1fr; }
    .checkbox-group-2col { grid-template-columns: 1fr; }
}

/* ========================================================
   SSH auth mode radio toggle
   ======================================================== */

.ssh-auth-mode-toggle {
    display: flex;
    gap: 0.625rem;
    margin-bottom: 0.75rem;
}

.ssh-mode-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    background: var(--card);
}

.ssh-mode-option input[type="radio"] {
    display: none;
}

.ssh-mode-option:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.ssh-mode-option.active {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12);
}

/* ========================================================
   Connection config fields (node add/edit)
   ======================================================== */

.conn-fields-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.conn-field-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.conn-or-divider {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    padding: 0.25rem 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin: 0.25rem 0;
}

/* ========================================================
   SSH Key pages
   ======================================================== */

.key-form-stack {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.key-identifier {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    background: var(--bg);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.key-filepath {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.key-meta-row {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.875rem;
}

.key-preview-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.key-preview {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.75rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-secondary);
    line-height: 1.5;
    max-height: 160px;
    overflow: hidden;
}

.key-preview-actions {
    display: flex;
    gap: 0.5rem;
}

/* Screen-reader only (for hidden copy targets) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Sidebar sub-items (e.g. Settings → Notifications / API Keys) */
.nav-item.nav-subitem {
    padding-left: 2.75rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
    border-left: 2px solid transparent;
}
.nav-item.nav-subitem:hover { color: var(--text); background: transparent; }
.nav-item.nav-subitem.active {
    color: var(--primary);
    border-left-color: var(--primary);
    background: var(--primary-light);
}
.nav-item.nav-subitem .nav-icon { display: none; }