:root {
  --app-bg: #f3f4f6;
  --app-surface: #ffffff;
  --app-border: #dfe3e8;
  --app-text: #111827;
  --app-muted: #6b7280;
  --app-strong: #0f172a;
}

body.app-body {
  min-height: 100vh;
  background: var(--app-bg);
  color: var(--app-text);
}

.app-shell {
  max-width: 34rem;
  padding: 1.25rem 1rem 2rem;
}

.app-header {
  margin-bottom: 1rem;
}

.app-kicker {
  color: var(--app-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.app-title {
  color: var(--app-strong);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.app-subtitle {
  color: var(--app-muted);
  font-size: 0.95rem;
}

.app-card {
  background: var(--app-surface);
  border-radius: 1rem;
}

.app-state-card {
  margin-top: 1rem;
}

.close-value {
  color: var(--app-strong);
  font-size: clamp(2.8rem, 14vw, 4.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.92;
  font-variant-numeric: tabular-nums;
}

.close-timestamp {
  color: var(--app-muted);
  font-size: 0.95rem;
}

.metric-tile {
  height: 100%;
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--app-border);
  border-radius: 0.85rem;
  background: #f8fafc;
}

.metric-label {
  color: var(--app-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.metric-value {
  margin-top: 0.35rem;
  color: var(--app-strong);
  font-size: 1.05rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.detail-list {
  border-top: 1px solid var(--app-border);
  padding-top: 0.25rem;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--app-border);
}

.detail-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.detail-label {
  color: var(--app-muted);
  font-size: 0.9rem;
}

.detail-value {
  color: var(--app-strong);
  font-size: 0.92rem;
  font-weight: 500;
  text-align: right;
}

.error-body {
  margin: 0;
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--app-muted);
}

@media (min-width: 576px) {
  .app-shell {
    padding-top: 2rem;
    padding-bottom: 2.5rem;
  }

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

  .metric-tile {
    padding: 1rem;
  }
}