:root {
  /* Color Scheme */
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-border: #d1d5db;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-light: #60a5fa;
  --color-success: #16a34a;
  --color-danger: #dc2626;

  /* Typography */
  --font-base: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --line-height-base: 1.5;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 0.25rem;
  --transition-base: 0.2s ease-in-out;

  /* Breakpoints */
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body, h1, h2, h3, h4, h5, h6, p {
  font-family: var(--font-base);
  color: var(--color-text);
}

img, svg, video, canvas, audio, iframe, embed, object {
  display: block;
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

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

a:hover, a:focus {
  color: var(--color-primary-light);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Basic Layout */
body {
  background-color: var(--color-bg);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-shell {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Responsive adjustments */
@media (min-width: var(--bp-md)) {
  .app-shell {
    padding: var(--spacing-lg);
  }
}

@media (min-width: var(--bp-lg)) {
  .app-shell {
    padding: var(--spacing-xl);
  }
}

/* Footer Copyright */
footer {
  text-align: center;
  padding: var(--spacing-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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