:root {
  color-scheme: dark;
  background: #0c1120;
  color: #f4f4f5;
  font-family: Inter, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-image: radial-gradient(circle at top left, rgba(56, 189, 248, 0.08), transparent 25%),
    radial-gradient(circle at bottom right, rgba(251, 191, 36, 0.06), transparent 20%),
    linear-gradient(180deg, rgba(15, 23, 42, 0.95) 0%, rgba(12, 17, 32, 0.98) 35%, rgba(10, 12, 25, 1) 100%);
}

header,
footer {
  text-align: center;
  padding: 1.75rem 1rem;
  background: rgba(18, 25, 41, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

header h1,
footer p {
  margin: 0;
}

header h1 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  letter-spacing: 0.25rem;
  text-transform: none;
  margin-bottom: 0.5rem;
}

header h1::first-letter {
  font-size: 4rem;
  font-weight: 800;
  color: #38bdf8;
  margin-right: 0.08em;
}

header p {
  color: #cbd5e1;
  max-width: 640px;
  margin: 0 auto;
}

main {
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.card {
  background: #111827;
  border: 1px solid #334155;
  border-radius: 14px;
  padding: 1rem;
}

.card-label {
  display: block;
  color: #94a3b8;
  margin-bottom: 0.5rem;
}

.chart-area {
  background: #111827;
  border: 1px solid #334155;
  border-radius: 14px;
  padding: 1rem;
  margin-bottom: 1.25rem;
}

#priceChart {
  width: 100%;
  height: 260px;
  display: block;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.toolbar label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #111827;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 0.75rem 1rem;
}

select {
  background: #0f172a;
  border: 1px solid #334155;
  color: #f8fafc;
  border-radius: 8px;
  padding: 0.5rem;
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #111827;
}

thead th {
  text-align: left;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid #334155;
}

tbody tr:hover {
  background: rgba(148, 163, 184, 0.08);
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid #334155;
}

a {
  color: #38bdf8;
  text-decoration: none;
}

.changes-list {
  display: grid;
  gap: 0.75rem;
}

.change-item {
  background: #111827;
  border: 1px solid #334155;
  border-radius: 14px;
  padding: 1rem;
}

.change-item strong {
  display: block;
  margin-bottom: 0.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: 0.5rem;
}

.tag.new {
  background: #0f766e;
}

.tag.price_changed {
  background: #ea580c;
}

.tag.attributes_changed {
  background: #2563eb;
}

.tag.removed {
  background: #b91c1c;
}

footer {
  margin-top: 1.5rem;
}