:root {
  --color-bg-base: #f6f8fb;
  --color-bg-surface: #ffffff;
  --color-bg-elevated: #eef3f8;
  --color-border: #d8e0ea;
  --color-border-focus: #1668b8;
  --color-text-primary: #17212f;
  --color-text-secondary: #526173;
  --color-text-muted: #728096;
  --color-accent: #1668b8;
  --color-accent-hover: #0f5599;
  --color-green: #168a52;
  --color-yellow: #a26b00;
  --color-red: #bf2f2f;
  --color-orange: #c75d1a;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(23, 33, 47, 0.08);
  --shadow-md: 0 10px 24px rgba(23, 33, 47, 0.12);
}

* {
  box-sizing: border-box;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 20;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: #ffffff;
  background: var(--color-accent);
  transform: translateY(-140%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-bg-base);
  color: var(--color-text-primary);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

/* Ensure the HTML hidden attribute always wins over class-level display rules. */
[hidden] {
  display: none !important;
}

.login-screen {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(100%, 420px);
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-md);
}

.login-panel h1,
.page-header h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.16;
}

.login-copy,
.muted,
.empty-state p,
.metric-label,
.row-meta,
.stat-label,
.panel-note {
  color: var(--color-text-secondary);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-field {
  display: grid;
  gap: 8px;
  margin: 18px 0;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 600;
}

.form-field input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
}

.form-field input:focus-visible,
.btn:focus-visible,
.nav-item:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.segment:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.form-error {
  min-height: 20px;
  margin: 0 0 16px;
  color: var(--color-red);
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.btn-primary {
  width: 100%;
  color: #ffffff;
  background: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-secondary {
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-elevated);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.64;
}

.btn-sm {
  min-height: 34px;
  padding: 0 12px;
  font-size: 14px;
}

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

.topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 64px;
  padding: 0 24px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-surface);
}

.brand-lockup,
.topbar-actions,
.topbar-nav {
  display: flex;
  align-items: center;
}

.brand-lockup {
  gap: 10px;
  min-width: 210px;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  color: #ffffff;
  background: var(--color-accent);
  font-weight: 800;
}

.brand-text {
  font-weight: 800;
}

.topbar-nav {
  gap: 4px;
  flex: 1;
}

.nav-item {
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  background: transparent;
  font-weight: 700;
}

.nav-item:hover,
.nav-item[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-bg-elevated);
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  margin-left: 6px;
  border-radius: 999px;
  color: #ffffff;
  background: var(--color-red);
  font-size: 12px;
}

.topbar-actions {
  gap: 10px;
}

.user-chip {
  color: var(--color-text-secondary);
  font-size: 14px;
}

.alert-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 24px;
  color: #ffffff;
  background: var(--color-red);
}

.alert-bar-text {
  min-width: 0;
}

.alert-bar-retry {
  flex-shrink: 0;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.7);
  background: transparent;
}

.alert-bar-retry:hover {
  background: rgba(255, 255, 255, 0.15);
}

.page-shell {
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

.page-header {
  margin-bottom: 28px;
}

.page-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  align-items: center;
  margin: 10px 0 0;
}

.sync-status {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--color-text-primary);
  background: var(--color-bg-elevated);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sync-status.is-live {
  color: #0d5e37;
  background: #dff5ea;
}

.sync-status.is-stale {
  color: #8d1f1f;
  background: #fde0e0;
}

.sync-status.is-warming {
  color: #774d00;
  background: #fff1cf;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.metric-card {
  min-height: 148px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-sm);
}

.metric-card strong {
  display: block;
  margin-top: 10px;
  font-size: 34px;
  line-height: 1;
}

.metric-label {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.metric-tooltip-hint {
  font-size: 12px;
  font-weight: 400;
  text-transform: none;
  color: var(--color-text-muted);
  cursor: help;
}

.metric-detail {
  margin: 12px 0 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-elevated);
}

.skeleton::after {
  position: absolute;
  inset: 0;
  content: "";
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.7), transparent);
  animation: shimmer 1.4s infinite;
}

.empty-state {
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  text-align: center;
}

.empty-state h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.empty-state p {
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.5;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.7fr);
  gap: 18px;
}

.panel,
.data-row {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-sm);
}

.panel-wide {
  grid-column: 1 / -1;
}

.panel-heading,
.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-heading {
  padding: 20px 20px 0;
}

.panel-heading h3,
.section-heading h2 {
  margin: 0;
}

.panel-body {
  padding: 18px 20px 20px;
}

.loading-line {
  min-height: 96px;
  color: var(--color-text-muted);
}

.section-heading {
  margin-bottom: 16px;
}

.section-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.segmented-control {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-surface);
}

.segment {
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-left: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  background: transparent;
  font-weight: 800;
}

.segment:first-child {
  border-left: 0;
}

.segment:hover,
.segment[aria-pressed="true"] {
  color: var(--color-accent);
  background: var(--color-bg-elevated);
}

.sort-control {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 700;
}

.sort-control select {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
}

.data-list {
  display: grid;
  gap: 12px;
}

.data-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 16px;
}

.row-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.row-title h3,
.row-title h4 {
  margin: 0;
  overflow-wrap: anywhere;
}

.row-meta {
  margin: 6px 0 0;
  font-size: 14px;
}

.row-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(82px, 1fr));
  gap: 10px;
  text-align: right;
}

.stat-value {
  display: block;
  font-weight: 800;
}

.stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  text-transform: uppercase;
}

.status-pill,
.severity-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.status-green,
.severity-info {
  color: #0d5e37;
  background: #dff5ea;
}

.status-yellow,
.severity-warning {
  color: #774d00;
  background: #fff1cf;
}

.status-red,
.severity-critical {
  color: #8d1f1f;
  background: #fde0e0;
}

.traffic-row {
  grid-template-columns: minmax(220px, 0.7fr) minmax(220px, 1fr) auto;
}

.device-row,
.device-camera-row {
  grid-template-columns: minmax(0, 1fr) auto;
}

.device-camera-row {
  background: var(--color-bg-elevated);
}

.camera-role {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.traffic-overview {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.traffic-overview .metric-card {
  min-height: 118px;
}

.traffic-overview .metric-card strong {
  font-size: 24px;
  line-height: 1.12;
}

.traffic-chart {
  padding: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-sm);
}

.traffic-chart h3 {
  margin: 0 0 14px;
}

.traffic-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.traffic-chart-track {
  fill: var(--color-bg-elevated);
}

.traffic-chart-bar {
  fill: var(--color-green);
}

.traffic-chart-label,
.traffic-chart-value {
  fill: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 700;
}

.traffic-chart-value {
  fill: var(--color-text-primary);
}

.rank-badge {
  display: inline-grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border-radius: 999px;
  color: #ffffff;
  background: var(--color-accent);
  font-size: 13px;
  font-weight: 800;
}

.traffic-bar-track {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--color-bg-elevated);
}

.traffic-bar-fill {
  height: 100%;
  min-width: 4px;
  border-radius: inherit;
  background: var(--color-green);
}

.alert-row {
  grid-template-columns: minmax(0, 1fr) auto;
}

.alert-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.alert-message {
  margin: 0;
  font-weight: 800;
}

.alert-detail {
  margin: 6px 0 0;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

@media (max-width: 820px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .brand-lockup,
  .topbar-actions,
  .topbar-nav {
    width: 100%;
  }

  .topbar-nav {
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 2px;
    scrollbar-width: thin;
    /* Remove flex-wrap so items stay on one scrollable row */
  }

  .nav-item {
    flex: 0 0 auto;
  }

  .topbar-actions {
    justify-content: space-between;
  }

  .topbar-actions {
    align-items: stretch;
    flex-wrap: wrap;
  }

  .topbar-actions .btn,
  .topbar-actions .user-chip {
    width: 100%;
  }

  .alert-bar {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 16px;
  }

  .alert-bar-retry {
    width: 100%;
  }

  .metric-grid,
  .traffic-overview,
  .dashboard-grid,
  .data-row,
  .traffic-row {
    grid-template-columns: 1fr;
  }

  .panel-heading,
  .section-heading,
  .row-title {
    align-items: flex-start;
    flex-direction: column;
  }

  .segmented-control {
    width: 100%;
  }

  .segment {
    flex: 1;
  }

  .alert-actions {
    justify-content: flex-start;
  }

  .row-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    text-align: left;
  }

  /* Traffic chart SVG text becomes illegible at narrow widths because the   *
   * viewBox is fixed at 900px. Hide the SVG chart; the per-row bar tracks   *
   * already give visual comparison.                                          */
  .traffic-chart {
    display: none;
  }
}