:root {
  color-scheme: light;

  /* Crisp Modern Whitish Light Theme (Clean Slate & Soft White) */
  --bg-main: #f1f5f9;        /* Soft airy light-slate background, no eye glare */
  --bg-surface: #ffffff;     /* Clean pure white for headers, panels, cards */
  --bg-card: #ffffff;        /* Pure crisp white card surface */
  --bg-card-hover: #f8fafc;  /* Subtle hover tint */
  --bg-input: #ffffff;       /* Pure white form inputs */
  --border-color: #e2e8f0;   /* Clean light slate border */
  --border-subtle: #f1f5f9;

  /* High-Contrast, Glare-Free Modern Typography */
  --text-primary: #0f172a;   /* Deep slate navy, crystal clear legibility */
  --text-secondary: #475569; /* Balanced slate gray for subheaders and labels */
  --text-muted: #94a3b8;     /* Soft slate muted captions and timestamps */

  /* Vibrant, Professional Accent Palette (Calibrated for Light Backgrounds) */
  --sky: #0284c7;            /* Ocean blue, primary actions and links */
  --sky-hover: #0369a1;
  --sky-glow: rgba(2, 132, 199, 0.08);
  --emerald: #059669;        /* Forest emerald, success and active status */
  --emerald-subtle: #ecfdf5;
  --amber: #d97706;          /* Warm amber, warning and schedule status */
  --amber-subtle: #fffbeb;
  --rose: #e11d48;           /* Crimson rose, danger and error status */
  --rose-subtle: #fff1f2;
  --purple: #7c3aed;         /* Royal violet, batches and visual format */
  --purple-subtle: #faf5ff;

  /* Font System - Plus Jakarta Sans for friendly cognitive legibility */
  --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Refined Elevation & Shadows for Crisp White Cards */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 4px 14px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header */
.app-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-logo {
  font-size: 26px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 8px;
  padding: 6px 10px;
}

.app-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.app-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-badge.paused {
  background: rgba(245, 158, 11, 0.12);
  color: var(--amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.status-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
  animation: pulse 2s infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.3;
  }
}

/* Metrics Strip */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 24px 28px 0;
  max-width: 1400px;
  margin: 0 auto;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-2px);
  border-color: rgba(2, 132, 199, 0.4);
  box-shadow: var(--shadow-hover);
}

.metric-label {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.metric-value {
  font-size: 28px;
  font-weight: 800;
  margin: 8px 0 3px;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.metric-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.text-sky {
  color: var(--sky);
}

.text-emerald {
  color: var(--emerald);
}

.text-amber {
  color: var(--amber);
}

.text-purple {
  color: var(--purple);
}

/* Main Container */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 28px;
}

/* Nav Tabs */
.nav-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.nav-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.nav-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav-tab.active {
  color: var(--sky);
  border-bottom-color: var(--sky);
  background: rgba(56, 189, 248, 0.06);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Section Header */
.section-header {
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* Panel Card */
.panel-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-card);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-header h3 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* Layouts */
.two-col-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 1000px) {
  .two-col-layout {
    grid-template-columns: 1fr;
  }
}

/* Accounts Grid (Ergonomic cards with tactile elevation) */
.accounts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(285px, 1fr));
  gap: 16px;
}

.account-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.account-card:hover {
  transform: translateY(-2px);
  border-color: rgba(2, 132, 199, 0.45);
  box-shadow: var(--shadow-hover);
}

.account-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.account-email {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  word-break: break-all;
}

.account-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 9999px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--sky);
  border: 1px solid rgba(2, 132, 199, 0.25);
  letter-spacing: 0.02em;
}

.gauge-bar-bg {
  background-color: #e2e8f0;
  height: 6px;
  border-radius: 9999px;
  overflow: hidden;
  margin: 8px 0;
}

.gauge-bar-fill {
  background-color: var(--emerald);
  height: 100%;
  border-radius: 9999px;
  transition: width 0.35s ease, background-color 0.35s ease;
}

.account-stats-row {
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--text-secondary);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--sky);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
  background-color: #ffffff;
}

select option,
select optgroup {
  background-color: #ffffff;
  color: #0f172a;
}

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

.font-mono {
  font-family: var(--font-mono);
}

.form-help {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 5px;
  display: block;
  line-height: 1.4;
}

/* Buttons (Accessibility: minimum 36px height, 44px on mobile, clear focus rings) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease-in-out;
  letter-spacing: 0.01em;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.4);
}

.btn-sm {
  min-height: 30px;
  padding: 5px 12px;
  font-size: 12px;
}

.btn-xs {
  min-height: 24px;
  padding: 3px 8px;
  font-size: 11px;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #ffffff;
  border: 1px solid rgba(2, 132, 199, 0.4);
  box-shadow: 0 1px 3px rgba(2, 132, 199, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #0369a1, #075985);
  box-shadow: 0 3px 8px rgba(2, 132, 199, 0.35);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.btn-secondary:hover:not(:disabled) {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--text-primary);
}

.btn-secondary:active:not(:disabled) {
  background: #f1f5f9;
}

.btn-danger {
  background: #fff1f2;
  color: #be123c;
  border: 1px solid #fecdd3;
}

.btn-danger:hover:not(:disabled) {
  background: #ffe4e6;
  border-color: #fda4af;
  color: #9f1239;
}

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

.btn-block {
  width: 100%;
}

/* Tag Pills */
.tag-pills {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.tag-pill {
  background-color: rgba(56, 189, 248, 0.1);
  color: var(--sky);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  user-select: none;
}

.tag-pill:hover {
  background-color: rgba(56, 189, 248, 0.25);
}

/* File Drop Zone */
.file-drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  cursor: pointer;
  background-color: rgba(255, 255, 255, 0.02);
  transition: border-color 0.2s;
}

.file-drop-zone:hover,
.file-drop-zone.dragover {
  border-color: var(--sky);
}

/* Tables (Legible typography, subtle hover row highlight) */
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}

.data-table th {
  text-align: left;
  padding: 12px 14px;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: #f8fafc;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #f1f5f9;
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background-color 0.12s ease;
}

.data-table tbody tr:hover {
  background-color: #f8fafc;
}

.table-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 36px 16px !important;
  font-size: 13px;
}

/* Badges (WCAG Compliant status pills with border accents) */
.badge {
  font-size: 10.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.badge-completed {
  background: #ecfdf5;
  color: #047857;
  border: 1px solid #a7f3d0;
}

.badge-queued {
  background: #f0f9ff;
  color: #0369a1;
  border: 1px solid #bae6fd;
}

.badge-sending {
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
}

.badge-failed {
  background: #fff1f2;
  color: #be123c;
  border: 1px solid #fecdd3;
}

.badge-scheduled {
  background: #faf5ff;
  color: #6b21a8;
  border: 1px solid #e9d5ff;
}

.badge-paused {
  background: #fefce8;
  color: #854d0e;
  border: 1px solid #fef08a;
}

.badge-cancelled {
  background: #f1f5f9;
  color: #475569;
  border: 1px solid #cbd5e1;
}

/* Terminal Window */
.terminal-window {
  background-color: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #0f172a;
  border-radius: 6px;
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  max-height: 400px;
  overflow-y: auto;
}

.terminal-line {
  margin-bottom: 4px;
  line-height: 1.4;
}

.card-callout {
  background: rgba(56, 189, 248, 0.05);
  border-left: 3px solid var(--sky);
  padding: 10px 14px;
  font-size: 12px;
  color: var(--text-secondary);
  border-radius: 0 6px 6px 0;
}

/* Quick Actions & Modal */
.action-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  border-color: rgba(56, 189, 248, 0.6) !important;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 20px;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 520px;
  padding: 24px;
  box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.18);
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sky), var(--sky-hover));
  color: #fff;
  font-weight: 700;
  font-size: 13px;
}

/* ==========================================
   EXTENSION DASHBOARD UI UPGRADES
   ========================================== */

/* Diagnostics Bar */
.diagnostics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  padding: 14px 28px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.diag-item {
  display: flex;
  flex-direction: column;
}

.diag-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.diag-value {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
}

/* Filter Pills */
.filter-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-pill {
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-pill:hover {
  background: #e2e8f0;
  color: var(--text-primary);
}

.filter-pill.active {
  background: #e0f2fe;
  border-color: #7dd3fc;
  color: #0284c7;
}

/* Pagination Bar */
.pagination-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.page-btn {
  padding: 4px 10px;
  font-size: 12px;
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Custom Scrollbar for Dark Theme */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================
   RESPONSIVE UI / UX OVERHAUL
   ========================================== */

/* ==========================================
   RESPONSIVE UI / UX OVERHAUL (Mobile-First Polish)
   ========================================== */

/* Tablet Screens (<= 992px) */
@media (max-width: 992px) {
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 12px 18px;
  }

  .header-left {
    justify-content: flex-start;
  }

  .header-right {
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    width: 100%;
  }

  .diagnostics-bar {
    grid-template-columns: repeat(3, 1fr);
    padding: 10px 18px;
    gap: 10px;
  }

  .metrics-strip {
    padding: 16px 18px 0;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
  }

  .main-container {
    padding: 16px;
  }

  .two-col-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* Mobile Screens (<= 768px) */
@media (max-width: 768px) {
  /* 1. Header: Clean 2-Row Stack */
  .app-header {
    padding: 10px 14px;
    gap: 10px;
  }

  .header-left {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .app-title {
    font-size: 15px;
    font-weight: 700;
  }

  .app-subtitle {
    font-size: 10.5px;
  }

  .app-logo {
    font-size: 20px;
    padding: 3px 6px;
  }

  .header-right {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    white-space: nowrap;
    width: 100%;
    padding-bottom: 4px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .header-right::-webkit-scrollbar {
    display: none;
  }

  .header-right .btn, 
  .header-right .status-badge {
    font-size: 11px;
    padding: 5px 9px;
    min-height: 32px;
    flex-shrink: 0;
  }

  /* 2. Diagnostics & Metrics */
  .diagnostics-bar {
    grid-template-columns: repeat(2, 1fr);
    padding: 8px 12px;
    gap: 8px;
  }

  .metrics-strip {
    padding: 12px 12px 0;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .metric-card {
    padding: 10px 14px;
  }

  .metric-value {
    font-size: 20px;
  }

  /* 3. Main Workspace & Mobile Padding */
  .main-container {
    padding: 12px 12px 80px 12px; /* Bottom space for Fixed Bottom App Bar */
  }

  /* 4. Navigation: Fixed Mobile Bottom App Bar */
  .nav-tabs {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0 4px;
    margin: 0;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .nav-tabs::-webkit-scrollbar {
    display: none;
  }

  .nav-tab {
    flex: 1;
    min-width: 58px;
    padding: 6px 4px;
    font-size: 10px;
    font-weight: 600;
    border-radius: 6px;
    border-bottom: none !important;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    white-space: normal;
    line-height: 1.2;
    min-height: 48px; /* 48px thumb tap target */
  }

  .nav-tab.active {
    background: rgba(56, 189, 248, 0.12);
    color: var(--sky);
  }

  /* 5. Panels & Forms */
  .panel-card {
    padding: 14px 12px;
    border-radius: 8px;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  /* 6. Parent-Child Campaign Cards */
  .parent-campaign-header {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 10px 12px;
  }

  .parent-title-group {
    width: 100%;
    min-width: auto;
  }

  .parent-metrics-group {
    width: 100%;
    max-width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .parent-actions-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    width: 100%;
  }

  .parent-actions-group .btn {
    flex: 1 1 calc(50% - 4px);
    min-height: 36px;
    font-size: 11px;
  }

  .child-batch-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 10px 12px 10px 20px;
  }

  /* 7. Tables: Compact View with Touch Momentum Scrolling */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 6px;
  }

  .data-table {
    min-width: 580px; /* Enable horizontal swipe without text squishing */
  }

  .data-table th,
  .data-table td {
    padding: 7px 8px;
    font-size: 10.5px;
  }

  /* 8. Full-Screen Mobile Bottom Sheet for Drawer */
  .slide-over-drawer {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100vw !important;
    max-width: 100vw !important;
    height: 94vh !important;
    max-height: 94vh !important;
    border-radius: 16px 16px 0 0;
    border-left: none;
    border-top: 1px solid var(--sky);
    transform: translateY(100%);
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.7);
  }

  .slide-over-drawer.active {
    transform: translateY(0);
  }

  .drawer-header {
    padding: 12px 16px;
    border-radius: 16px 16px 0 0;
  }

  .drawer-body {
    padding: 12px 14px;
  }

  .drawer-footer {
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
  }

  /* 9. Modals (Center / Bottom Safe-Area) */
  .modal-card {
    padding: 14px;
    margin: 8px;
    width: 95%;
    max-height: 92vh;
    overflow-y: auto;
    padding-bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  }

  .accounts-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* Extra Small Phones (<= 480px) */
@media (max-width: 480px) {
  .diagnostics-bar {
    grid-template-columns: 1fr;
  }

  .parent-actions-group .btn {
    flex: 1 1 100%; /* Full-width stacked buttons on narrow devices */
  }
}

/* High-Density Linear/Raycast UI Tokens & Parent-Child Campaign Hierarchy */
.throughput-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--sky);
}

.parent-campaign-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.parent-campaign-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-hover);
}

.parent-campaign-header {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  cursor: pointer;
  background: var(--bg-surface);
}

.parent-campaign-header:hover {
  background: #f8fafc;
}

.parent-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 240px;
}

.parent-chevron {
  transition: transform 0.25s ease;
  font-size: 12px;
  color: var(--text-muted);
}

.parent-campaign-card.open .parent-chevron {
  transform: rotate(90deg);
}

.parent-metrics-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-grow: 1;
  max-width: 420px;
}

.parent-progress-bar-bg {
  flex-grow: 1;
  background: #e2e8f0;
  height: 7px;
  border-radius: 999px;
  overflow: hidden;
}

.parent-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--sky), var(--emerald));
  border-radius: 999px;
  transition: width 0.3s ease;
}

.parent-actions-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.child-batches-container {
  display: none;
  border-top: 1px solid var(--border-color);
  background: #f8fafc;
}

.parent-campaign-card.open .child-batches-container {
  display: block;
}

.child-batch-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1.2fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 18px 10px 38px;
  border-bottom: 1px solid var(--border-color);
  font-size: 12px;
  transition: background 0.15s ease;
}

.child-batch-row:last-child {
  border-bottom: none;
}

.child-batch-row:hover {
  background: #f1f5f9;
}

/* Slide-Over Inspection Drawer */
.slide-over-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.slide-over-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.slide-over-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 820px;
  max-width: 95vw;
  background: #ffffff;
  border-left: 1px solid var(--border-color);
  z-index: 9999;
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -10px 0 35px rgba(15, 23, 42, 0.15);
}

.slide-over-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  flex-shrink: 0;
}

.drawer-body {
  padding: 16px 20px;
  overflow: hidden;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.drawer-table-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
}

.drawer-table-scroll table thead th {
  position: sticky;
  top: 0;
  background: var(--bg-surface);
  z-index: 2;
  box-shadow: 0 1px 0 var(--border-color);
}

.drawer-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  background: var(--bg-surface);
}

/* High-Density Button Refinements */
.btn-xs {
  padding: 3px 8px;
  font-size: 11px;
  border-radius: var(--radius-sm);
}

.btn-pill {
  border-radius: 999px;
  padding: 4px 12px;
}