:root {
  --color-bg: #fafafa;
  --color-fg: #1f2937;
  --color-fg-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;
  --color-warning: #d97706;
  --color-success: #16a34a;
  --color-card: #ffffff;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --radius: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.06);

  --header-height: 56px;

  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
                 Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-system);
  font-size: 14px;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

#main {
  flex: 1;
  padding: var(--space-5);
  width: 100%;
}

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

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  margin: 0 0 var(--space-4) 0;
  font-weight: 600;
}

h1 { font-size: 20px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }