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

:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #666;
  --color-primary: #1976d2;
  --color-positive: #2e7d32;
  --color-negative: #c62828;
  --border-radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}