/* Analytics dashboard styles — reutilise variables review.css */

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #0A0E1A;
  color: #F0F0F0;
  padding: 20px 24px;
  min-height: 100vh;
  max-width: 1280px;
  margin: 0 auto;
}

/* Header */
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}
h1 {
  color: #E74C3C;
  font-size: 20px;
  font-weight: 700;
}
.nav {
  display: flex;
  gap: 12px;
  align-items: center;
}
.nav a {
  color: #94A3B8;
  font-size: 12px;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 5px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
}
.nav a:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
}
.last-updated {
  color: #555;
  font-size: 11px;
  font-family: monospace;
}

/* KPI cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.kpi-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 18px;
  position: relative;
  overflow: hidden;
}
.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, #E74C3C, #C0392B);
}
.kpi-card.green::before { background: linear-gradient(90deg, #27AE60, #2ECC71); }
.kpi-card.orange::before { background: linear-gradient(90deg, #F39C12, #E67E22); }
.kpi-card.blue::before { background: linear-gradient(90deg, #3B82F6, #2563EB); }

.kpi-label {
  color: #94A3B8;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.kpi-value {
  color: #F0F0F0;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
}
.kpi-sub {
  color: #94A3B8;
  font-size: 11px;
  margin-top: 6px;
}
.kpi-trend {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 10px;
  font-weight: 600;
  margin-left: 4px;
}
.kpi-trend.up { background: rgba(39,174,96,0.15); color: #2ECC71; }
.kpi-trend.down { background: rgba(231,76,60,0.15); color: #E74C3C; }
.kpi-trend.flat { background: rgba(148,163,184,0.15); color: #94A3B8; }

.skeleton {
  animation: pulse 1.5s infinite;
  min-height: 100px;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

/* Chart sections */
.chart-section {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.chart-section h2 {
  color: #F0F0F0;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}
.chart-section h2 small {
  color: #94A3B8;
  font-size: 11px;
  font-weight: 400;
}
.chart-wrapper {
  position: relative;
  margin: 0 -8px;
}

/* 2-col grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

/* Data tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 12px;
}
.data-table th {
  text-align: left;
  color: #94A3B8;
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.data-table td {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: #F0F0F0;
}
.data-table tr:hover td {
  background: rgba(255,255,255,0.03);
}
.data-table .num {
  text-align: right;
  font-family: monospace;
}
.data-table .empty {
  text-align: center;
  color: #555;
  font-style: italic;
  padding: 20px;
}
.data-table .word {
  font-family: 'SF Mono', 'Consolas', monospace;
  background: rgba(231,76,60,0.1);
  color: #E74C3C;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 600;
}
.data-table .lessons-list {
  font-size: 10px;
  color: #94A3B8;
  font-family: monospace;
  max-width: 360px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Errors */
.err {
  background: rgba(231,76,60,0.08);
  border-left: 3px solid #E74C3C;
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: #F8CACE;
  margin: 20px 0;
}