body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f7fb;
  color: #1f2937;
}

header {
  padding: 24px;
  background: #0f172a;
  color: white;
}

header h1 {
  margin: 0 0 6px 0;
}

header p {
  margin: 0;
  opacity: 0.85;
}

main {
  padding: 24px;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.tile {
  background: white;
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.08);
  border-left: 8px solid #94a3b8;
}

.tile.ok {
  border-left-color: #16a34a;
}

.tile.warn {
  border-left-color: #eab308;
}

.tile.bad {
  border-left-color: #dc2626;
}

.tile h2 {
  margin: 0 0 12px 0;
  font-size: 1.2rem;
}

.tile p {
  margin: 6px 0;
  font-size: 0.95rem;
}

.label {
  font-weight: bold;
}

.spark-block {
  margin-top: 14px;
}

.spark-title {
  font-size: 0.82rem;
  font-weight: bold;
  margin-bottom: 4px;
  color: #475569;
}

.spark-wrap {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 6px;
}

.spark-svg {
  width: 100%;
  height: 64px;
  display: block;
}

.spark-empty {
  font-size: 0.8rem;
  color: #64748b;
  padding: 10px 4px;
}