:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

#root {
  min-height: 100vh;
  padding: 2rem;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

.header {
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.header p {
  color: var(--text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.stat-card h3 {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.data-grid {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.data-grid table {
  width: 100%;
  border-collapse: collapse;
}

.data-grid thead {
  background: var(--bg-tertiary);
}

.data-grid th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

.data-grid td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.data-grid tbody tr {
  transition: background 0.2s;
}

.data-grid tbody tr:hover {
  background: var(--bg-tertiary);
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  color: var(--text-muted);
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-secondary);
}

.loading-skeleton {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  font-size: 1.125rem;
  color: var(--text-secondary);
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.shimmer {
  animation: shimmer 2s infinite linear;
  background: linear-gradient(to right, var(--bg-secondary) 4%, var(--bg-tertiary) 25%, var(--bg-secondary) 36%);
  background-size: 1000px 100%;
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  animation: slideIn 0.3s ease-out;
  z-index: 1000;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--error);
}

.toast.warning {
  border-left: 4px solid var(--warning);
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@media (max-width: 768px) {
  #root {
    padding: 1rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .data-grid {
    overflow-x: auto;
  }

  .toast {
    left: 1rem;
    right: 1rem;
  }
}