* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #222632;
  --border: #2a2e3a;
  --text: #e4e4e7;
  --text-muted: #8b8d98;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --positive: #22c55e;
  --negative: #ef4444;
  --store-1: #6366f1;
  --store-2: #10b981;
  --store-3: #f59e0b;
  --store-1-bg: rgba(99, 102, 241, 0.1);
  --store-2-bg: rgba(16, 185, 129, 0.1);
  --store-3-bg: rgba(245, 158, 11, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Header */
header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.date-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.presets {
  display: flex;
  gap: 4px;
}

.custom-range {
  display: flex;
  align-items: center;
  gap: 8px;
}

.custom-range span {
  color: var(--text-muted);
  font-size: 13px;
}

/* Buttons */
.btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

.btn.preset.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 34px;
  height: 34px;
  border-radius: 6px;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: var(--surface-hover);
}

/* Date inputs */
input[type="date"] {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
}

input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.8);
}

/* Main */
main {
  padding: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--text-muted);
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

/* Error banner */
.error-banner {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 20px;
}

/* Summary Cards */
.summary-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.store-row {
  display: grid;
  grid-template-columns: 180px repeat(4, 1fr);
  gap: 12px;
  align-items: stretch;
}

.store-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background: var(--surface);
  border-radius: 10px;
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
}

.store-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.metric-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.metric-card .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.metric-card .value {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.metric-card .change {
  font-size: 12px;
  margin-top: 4px;
}

.change.positive {
  color: var(--positive);
}

.change.negative {
  color: var(--negative);
}

.change.neutral {
  color: var(--text-muted);
}

.store-row.totals-row {
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.store-row.totals-row .store-label {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.05em;
}

.store-row.totals-row .metric-card {
  background: transparent;
  border: 1px solid var(--border);
}

/* Charts */
.chart-section {
  margin-bottom: 24px;
}

.chart-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.chart-container h2 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.chart-container.full-width {
  width: 100%;
}

.chart-container canvas {
  width: 100% !important;
}

/* Footer */
footer {
  padding: 16px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

/* Responsive */
@media (max-width: 900px) {
  .chart-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .store-row {
    grid-template-columns: 1fr 1fr;
  }

  .store-label {
    grid-column: 1 / -1;
  }

  .date-controls {
    flex-direction: column;
    align-items: flex-start;
  }
}