:root {
  /* Farb- und Layout-Variablen */
  --color-primary: #0066cc;
  --color-secondary: #3399ff;
  --color-accent: #ff9900;
  --color-bg: #ffffff;
  --color-text: #222222;
  --color-muted: #666666;
  --color-border: #cccccc;

  --color-bg-dark: #1a1a1a;
  --color-text-dark: #f0f0f0;
  --color-muted-dark: #999999;
  --color-border-dark: #444444;

  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;

  --radius-sm: 4px;
  --radius-md: 8px;

  --transition-fast: 0.2s ease-in-out;
}

/* ======================================== */
/* Light Theme */
/* ======================================== */
body.light-mode {
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

body.light-mode a {
  color: var(--color-primary);
}

body.light-mode a:hover,
body.light-mode a:focus {
  color: var(--color-accent);
}

body.light-mode .visualization_tool__card {
  background-color: #fafafa;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

body.light-mode .visualization_tool__header {
  background-color: var(--color-secondary);
  color: #fff;
}

body.light-mode .visualization_tool__table th,
body.light-mode .visualization_tool__table td {
  border-bottom: 1px solid var(--color-border);
}

/* ======================================== */
/* Dark Theme */
/* ======================================== */
body.dark-mode {
  background-color: var(--color-bg-dark);
  color: var(--color-text-dark);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

body.dark-mode a {
  color: var(--color-secondary);
}

body.dark-mode a:hover,
body.dark-mode a:focus {
  color: var(--color-accent);
}

body.dark-mode .visualization_tool__card {
  background-color: #2a2a2a;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

body.dark-mode .visualization_tool__header {
  background-color: var(--color-primary);
  color: #fff;
}

body.dark-mode .visualization_tool__table th,
body.dark-mode .visualization_tool__table td {
  border-bottom: 1px solid var(--color-border-dark);
}

/* ======================================== */
/* Accessibility: High Contrast Focus States */
/* ======================================== */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ======================================== */
/* Footer */
/* ======================================== */
footer {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-muted);
}

body.dark-mode footer {
  color: var(--color-muted-dark);
}

footer::after {
  content: "© 2026 Donau2Space.de";
  display: block;
  margin-top: var(--spacing-sm);
}