:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #7d8590;
  --accent: #c9d1d9;
  --accent2: #c9d1d9;
  --red: #da3633;
  --orange: #d29922;
  --green: #3fb950;
  --blue: #58a6ff;
  --roblox: #da3633;
  --fortnite: #7d8590;
  --minecraft: #7d8590;
  --steam: #7d8590;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; line-height: 1.5; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.header h1 { font-size: 22px; font-weight: 600; }
.header h1 span { color: var(--roblox); }
.header-meta { color: var(--text-dim); font-size: 12px; text-align: right; }

.nav {
  display: flex; gap: 4px; padding: 12px 32px; background: var(--surface);
  border-bottom: 1px solid var(--border); flex-wrap: wrap;
}
.nav button {
  background: transparent; border: 1px solid var(--border); color: var(--text-dim);
  padding: 8px 18px; border-radius: 8px; cursor: pointer; font-size: 13px;
  transition: all 0.2s;
}
.nav button:hover { border-color: var(--accent); color: var(--text); }
.nav button.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.container { max-width: 1440px; margin: 0 auto; padding: 24px 32px; }

.section { display: none; }
.section.active { display: block; }

/* KPI Cards */
.kpi-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 28px;
}
.kpi-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; position: relative; overflow: hidden;
}
.kpi-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.kpi-card.roblox::before { background: var(--roblox); }
.kpi-card.fortnite::before { background: var(--fortnite); }
.kpi-card.minecraft::before { background: var(--minecraft); }
.kpi-card.steam::before { background: var(--steam); }
.kpi-card.primary::before { background: var(--accent); }
.kpi-label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.kpi-value { font-size: 28px; font-weight: 700; }
.kpi-sub { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

.chart-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px;
}
.chart-row.full { grid-template-columns: 1fr; }
.chart-row.triple { grid-template-columns: 1fr 1fr 1fr; }

.chart-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px;
}
.chart-card h3 {
  font-size: 14px; font-weight: 600; margin-bottom: 16px; color: var(--text);
}
.chart-card canvas { max-height: 340px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 12px; border-bottom: 2px solid var(--border);
     color: var(--text-dim); font-weight: 600; text-transform: uppercase; font-size: 11px;
     letter-spacing: 0.5px; }
td { padding: 12px; border-bottom: 1px solid var(--border); }
tr:hover { background: var(--surface2); }

.table-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden;
}

/* Filters */
.filters {
  display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; align-items: center;
}
.filters label { font-size: 12px; color: var(--text-dim); font-weight: 500; }
.filters input,
.filters select {
  background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  padding: 6px 12px; border-radius: 6px; font-size: 13px;
}
.filters input::placeholder { color: var(--text-dim); }

/* Platform tags */
.platform-tag {
  display: inline-block; padding: 4px 10px; border-radius: 6px; font-size: 11px; font-weight: 600;
  text-transform: uppercase;
}
.platform-tag.Roblox { background: #da363333; color: var(--roblox); }
.platform-tag.Fortnite { background: #7d859033; color: var(--fortnite); }
.platform-tag.Minecraft { background: #7d859033; color: var(--minecraft); }
.platform-tag.Steam { background: #7d859033; color: var(--steam); }

/* Category tags */
.category-tag {
  display: inline-block; padding: 4px 10px; border-radius: 6px; font-size: 11px; font-weight: 600;
  text-transform: uppercase;
}
.category-tag.items-currency { background: #58a6ff33; color: var(--blue); }
.category-tag.age-verified { background: #3fb95033; color: var(--green); }
.category-tag.og-veteran { background: #d2992233; color: var(--orange); }
.category-tag.general { background: #484f5833; color: var(--text-dim); }

.view-link {
  display: inline-block; padding: 4px 10px; border-radius: 6px; background: #58a6ff33;
  color: var(--blue); font-size: 12px; font-weight: 600; cursor: pointer;
}
.view-link:hover { background: #58a6ff66; text-decoration: underline; }

/* Platform detail cards */
.platform-detail {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; margin-bottom: 20px;
}
.platform-detail h3 {
  font-size: 16px; font-weight: 600; margin-bottom: 12px;
}

.source-detail {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; margin-bottom: 20px;
}
.source-detail h3 {
  font-size: 16px; font-weight: 600; margin-bottom: 12px;
}

.metric-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px; margin: 12px 0;
}
.metric-item {
  background: var(--surface2); border: 1px solid var(--border); border-radius: 8px;
  padding: 12px;
}
.metric-label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }
.metric-value { font-size: 18px; font-weight: 700; margin-top: 4px; }

.links-list {
  display: flex; flex-direction: column; gap: 8px;
}
.link-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--surface2);
  border: 1px solid var(--border); border-radius: 8px;
}

h2 { margin-bottom: 20px; font-size: 18px; font-weight: 600; }
h4 { margin-top: 16px; margin-bottom: 12px; font-size: 14px; }

/* Age Verified highlight card */
.kpi-card.age-verified-card::before { background: var(--green); }
.kpi-card.age-verified-card { border-color: #3fb95044; }

/* Heatmap */
.heatmap { display: grid; gap: 2px; margin-top: 12px; }
.heatmap-cell {
  padding: 14px 10px; border-radius: 8px; text-align: center; font-size: 12px;
  font-weight: 600; transition: transform 0.15s;
}
.heatmap-cell:hover { transform: scale(1.05); }
.heatmap-cell.empty { background: var(--surface2); color: var(--text-dim); }
.heatmap-cell.low { background: #3fb95022; color: var(--green); }
.heatmap-cell.medium { background: #3fb95044; color: var(--green); }
.heatmap-cell.high { background: #3fb95077; color: #fff; }
.heatmap-header { background: transparent; color: var(--text-dim); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.5px; padding: 8px 10px; text-align: center; }
.heatmap-row-label { background: transparent; color: var(--text-dim); font-size: 12px;
  font-weight: 600; padding: 14px 10px; text-align: right; }

/* Alert banner */
.alert-banner {
  background: linear-gradient(135deg, #3fb95022, #3fb95008);
  border: 1px solid #3fb95044; border-radius: 12px;
  padding: 16px 20px; margin-bottom: 20px; display: flex; align-items: center; gap: 12px;
}
.alert-icon { font-size: 20px; }
.alert-text { font-size: 13px; color: var(--text); }
.alert-count { font-size: 24px; font-weight: 700; color: var(--green); }

/* Price alert badges */
.price-alert-badge {
  display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 10px;
  font-weight: 700; text-transform: uppercase; margin-left: 6px;
}
.price-alert-badge.critical { background: #da363333; color: var(--red); }
.price-alert-badge.watch { background: #d2992233; color: var(--orange); }

/* Week-over-week change indicator */
.kpi-wow {
  display: inline-flex; align-items: center; gap: 3px;
  font-size: 11px; font-weight: 600; margin-left: 6px; padding: 2px 6px;
  border-radius: 4px;
}
.kpi-wow.up { color: var(--green); background: #3fb95018; }
.kpi-wow.down { color: var(--red); background: #da363318; }
.kpi-wow.flat { color: var(--text-dim); background: var(--surface2); }

/* Median price display */
.price-detail { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

/* Data quality warning */
.data-quality-banner {
  background: linear-gradient(135deg, #d2992218, #da363312);
  border: 1px solid #d2992244; border-radius: 12px;
  padding: 14px 20px; margin-bottom: 20px; display: flex; align-items: flex-start; gap: 12px;
}
.data-quality-banner .dq-icon { font-size: 18px; margin-top: 1px; }
.data-quality-banner .dq-title { font-size: 13px; font-weight: 600; color: var(--orange); }
.data-quality-banner .dq-detail { font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.source-status {
  display: inline-flex; align-items: center; gap: 4px; font-size: 11px;
  padding: 2px 8px; border-radius: 4px; margin: 2px;
}
.source-status.ok { background: #3fb95018; color: var(--green); }
.source-status.degraded { background: #d2992222; color: var(--orange); }
.source-status.failed { background: #da363322; color: var(--red); }

@media (max-width: 900px) {
  .chart-row { grid-template-columns: 1fr; }
  .chart-row.triple { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .filters { flex-direction: column; align-items: stretch; }
  .filters input, .filters select { width: 100%; }
  .header { flex-direction: column; align-items: flex-start; gap: 10px; }
  .header-meta { text-align: left; }
}