:root {
  --bg1: #1e1117;
  --bg2: #3c1f2e;
  --glass: rgba(139, 69, 19, 0.15);
  --accent: #dc2626;
  --text-primary: #d4a574;
  --text-secondary: #b8956a;
  --card-radius: 14px;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  color: var(--text-primary);
  font-family: Inter, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 36px;
  border-bottom: 1px solid rgba(139, 69, 19, 0.1);
}

.header h1 {
  margin: 0;
  font-size: 1.5rem;
}

/* Back Button */
.back {
  background: transparent;
  border: 1px solid rgba(139, 69, 19, 0.2);
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s ease;
}

.back:hover {
  background: rgba(139, 69, 19, 0.2);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 24px;
}

/* Store Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Card Base Style */
.card {
  background: var(--glass);
  border-radius: var(--card-radius);
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
  user-select: none;
  color: var(--text-primary);
}

/* Store Selection Cards */
.grid .card {
  padding: 36px;
  font-size: 1.4rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

.grid .card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5);
  background: rgba(139, 69, 19, 0.25);
}

/* Metric Cards */
.cards {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 40px auto 0;
  max-width: 900px;
}

.metric {
  flex: 1;
  min-width: 250px;
  max-width: 250px;
  min-height: 150px;
  padding: 24px;
  text-align: center;
}

.metric .label {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 500;
}

.metric .value {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--accent);
}

.metric.total {
  height: 150px;
}

.metric.breakdown {
  height: auto;
}

/* Chart Container */
.chart {
  max-width: 900px;
  margin: 40px auto 0;
  padding: 30px;
  height: 400px;
}

/* Data Tables */
.data-tables {
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 30px;
  max-width: 1000px;
}

.table-section {
  padding: 30px;
}

.table-section h3 {
  margin: 0 0 20px 0;
  font-size: 1.4rem;
  color: var(--text-primary);
  text-align: center;
  font-weight: 600;
}

.table-container {
  overflow-x: auto;
  border-radius: 8px;
  background: rgba(139, 69, 19, 0.05);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th {
  background: rgba(139, 69, 19, 0.2);
  color: var(--text-primary);
  padding: 15px 12px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid rgba(139, 69, 19, 0.3);
}

td {
  padding: 12px;
  border-bottom: 1px solid rgba(139, 69, 19, 0.1);
  color: var(--text-secondary);
}

tr:hover {
  background: rgba(139, 69, 19, 0.08);
}

.sku-cell {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  max-width: 280px;
  word-break: break-all;
}

.category-cell {
  font-weight: 600;
  color: var(--accent);
}

.quantity-cell, .percentage-cell {
  text-align: right;
  font-weight: 600;
  color: var(--text-primary);
}

/* Empty State */
.empty {
  padding: 40px;
  border-radius: 12px;
  background: rgba(139, 69, 19, 0.08);
  font-size: 1.2rem;
  color: var(--text-secondary);
  text-align: center;
  margin: 40px auto;
  max-width: 500px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header {
    padding: 12px 20px;
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
  
  .container {
    padding: 0 16px;
  }
  
  .cards {
    flex-direction: column;
    gap: 15px;
  }
  
  .data-tables {
    gap: 20px;
  }
  
  .table-section {
    padding: 20px;
  }
  
  table {
    font-size: 0.85rem;
  }
  
  th, td {
    padding: 8px 6px;
  }
  
  .sku-cell {
    font-size: 0.75rem;
    max-width: 200px;
  }
}