:root {
  --sidebar-width: 260px;
  --color-primary: #1976D2;
  --color-bg: #f5f5f5;
  --color-sidebar: #fff;
  --color-border: #e0e0e0;
  --color-ok: #4CAF50;
  --color-sparse: #FFC107;
  --color-missing: #F44336;
  --color-template-residue: #FF9800;
  --color-placeholder-heavy: #9C27B0;
  --color-unknown: #9E9E9E;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: #333;
}

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--color-sidebar);
  border-right: 1px solid var(--color-border);
  padding: 16px;
  overflow-y: auto;
}

.sidebar h2 {
  font-size: 16px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.content {
  padding: 24px;
  overflow-y: auto;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 4px;
  padding: 8px 16px;
  font-size: 14px;
}

button.primary {
  background: var(--color-primary);
  color: white;
}

button.danger {
  background: var(--color-missing);
  color: white;
}

input, textarea {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 8px;
  font-size: 14px;
  width: 100%;
}

.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
}