:root {
  --color-background: #f5f7fa;
  --color-background-gradient: radial-gradient(
      circle at 8% 12%,
      rgba(37, 99, 235, 0.12),
      transparent 55%
    ),
    radial-gradient(
      circle at 88% 10%,
      rgba(96, 165, 250, 0.08),
      transparent 40%
    ),
    #f5f7fa;
  --color-surface: #ffffff;
  --color-card: #ffffff;
  --color-card-muted: #eef2f9;
  --color-text: #0f172a;
  --color-text-muted: #5b657a;
  --color-accent: #2563eb;
  --color-accent-contrast: #f8fafc;
  --color-outline: rgba(15, 23, 42, 0.08);
  --color-card-border: rgba(15, 23, 42, 0.08);
  --color-shadow: 0 18px 28px rgba(15, 23, 42, 0.12);
  --color-banner-bg: rgba(37, 99, 235, 0.1);
  --color-banner-border: rgba(37, 99, 235, 0.2);
  --color-banner-text: #1d4ed8;
  --color-value-indicator-match: #15803d;
  --color-value-indicator-diff: #b45309;
  --color-button-bg: var(--color-accent);
  --color-button-text: var(--color-accent-contrast);
  --color-button-border: transparent;
  --color-button-hover-shadow: 0 12px 20px rgba(37, 99, 235, 0.25);
  --color-button-disabled-bg: rgba(15, 23, 42, 0.08);
  --color-button-disabled-text: #6b7280;
  --shadow-card-diff: 0 16px 28px rgba(180, 83, 9, 0.22);
  --font-family: 'Nunito', system-ui, -apple-system, BlinkMacSystemFont,
    'Segoe UI', sans-serif;
  --radius-card: 16px;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --max-content-width: 960px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family);
  background: var(--color-background-gradient);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.5;
  font-optical-sizing: auto;
}

.app-header {
  padding: var(--space-5) var(--space-4) var(--space-4);
  margin: 0 auto;
  max-width: var(--max-content-width);
  color: var(--color-text);
}

.app-header h1 {
  margin: 0 0 var(--space-2);
  font-size: 1.75rem;
  font-weight: 700;
}

.lede {
  margin: 0 0 var(--space-4);
  color: var(--color-text-muted);
}

.banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-banner-bg);
  border: 1px solid var(--color-banner-border);
  color: var(--color-banner-text);
  padding: var(--space-3);
  border-radius: var(--radius-card);
  margin-bottom: var(--space-4);
}

.banner[hidden] {
  display: none !important;
}

.banner-actions {
  display: flex;
  gap: var(--space-2);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

button {
  border: 1px solid var(--color-button-border);
  background: var(--color-button-bg);
  color: var(--color-button-text);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.1s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--color-button-hover-shadow);
}

button:disabled {
  cursor: not-allowed;
  color: var(--color-button-disabled-text);
  background: var(--color-button-disabled-bg);
  box-shadow: none;
}

#status-line {
  display: block;
  min-height: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: var(--space-2);
}

.diagnostics {
  margin: 0 auto var(--space-6);
  padding: 0 var(--space-4) var(--space-6);
  max-width: var(--max-content-width);
  display: grid;
  gap: var(--space-5);
}

.category {
  display: grid;
  gap: var(--space-4);
  @media (min-width: 720px) {
    grid-template-columns: 1fr 1fr;
  }
}

h2 {
  margin: 0;
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.diagnostic-card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  padding: var(--space-4);
  box-shadow: var(--color-shadow);
  transition: transform 0.2s ease, border 0.2s ease, box-shadow 0.2s ease;
  border: 1px solid var(--color-card-border);
}

.diagnostic-card.is-loading {
  opacity: 0.8;
}

body[data-mode='compare'] .diagnostic-card.has-diff {
  border-color: var(--color-value-indicator-diff);
  box-shadow: var(--shadow-card-diff);
}

.diagnostic-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.05rem;
  color: var(--color-text);
}

.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.test-text {
  margin: 0;
  flex: 1;
}

.id-badge {
  background: var(--color-card-muted);
  border-radius: 8px;
  padding: 0 var(--space-2);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.value-row {
  display: grid;
  gap: var(--space-2);
  align-items: center;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.value {
  font-size: 1rem;
  font-weight: 600;
}

.value-snapshot {
  color: var(--color-text-muted);
}

.value-indicator {
  font-size: 0.85rem;
  justify-self: end;
  font-weight: 500;
  color: var(--color-value-indicator-match);
}

body[data-mode='compare'] .diagnostic-card.has-diff .value-indicator {
  color: var(--color-value-indicator-diff);
}

body[data-mode='live'] .value-snapshot,
body[data-mode='live'] .value-indicator {
  display: none;
}

body[data-mode='snapshot'] .value-live,
body[data-mode='snapshot'] .value-indicator {
  display: none;
}

body[data-mode='snapshot'] .value-snapshot {
  color: var(--color-text);
}

body[data-mode='compare'] .value-snapshot,
body[data-mode='compare'] .value-live {
  display: block;
}

body[data-mode='compare'] .value-row {
  grid-template-rows: repeat(2, minmax(0, 1fr)) auto;
}

.app-footer {
  margin: 0 auto;
  max-width: var(--max-content-width);
  padding: 0 var(--space-4) var(--space-6);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.app-footer p {
  margin: 0;
  text-align: center;
}

@media (min-width: 720px) {
  .diagnostic-card {
    padding: var(--space-5);
  }

  .value {
    font-size: 1.1rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #050505;
    --color-background-gradient: linear-gradient(
      160deg,
      #050505 0%,
      #0d0d0f 45%,
      #111114 100%
    );
    --color-surface: #0b0b0d;
    --color-card: #101014;
    --color-card-muted: #16161c;
    --color-text: #f3f4f6;
    --color-text-muted: #a3a7b6;
    --color-accent: #60a5fa;
    --color-accent-contrast: #05070b;
    --color-outline: rgba(255, 255, 255, 0.08);
    --color-card-border: rgba(255, 255, 255, 0.05);
    --color-shadow: 0 18px 28px rgba(0, 0, 0, 0.65);
    --color-banner-bg: rgba(96, 165, 250, 0.08);
    --color-banner-border: rgba(96, 165, 250, 0.18);
    --color-banner-text: #e2e8f0;
    --color-value-indicator-match: #34d399;
    --color-value-indicator-diff: #fbbf24;
    --color-button-bg: var(--color-accent);
    --color-button-text: #010203;
    --color-button-border: transparent;
    --color-button-hover-shadow: 0 12px 20px rgba(96, 165, 250, 0.35);
    --color-button-disabled-bg: rgba(148, 163, 184, 0.12);
    --color-button-disabled-text: rgba(226, 232, 240, 0.6);
    --shadow-card-diff: 0 16px 28px rgba(251, 191, 36, 0.18);
  }

  .id-badge {
    background: rgba(148, 163, 184, 0.12);
    color: var(--color-text);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}