/* ==============================
   Section: variables-and-reset
   ============================== */
:root {
  --color-bg: #f9fafb;
  --color-text: #1f2937;
  --color-primary: #2563eb;
  --color-secondary: #6b7280;
  --color-accent: #10b981;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --radius-sm: 4px;
  --font-family-base: 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.5;
  --max-width-content: 1200px;
  --transition-fast: 0.2s ease-in-out;
}

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

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

/* ==============================
   Section: app-structure
   ============================== */
.app-header {
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--spacing-md);
  text-align: center;
  font-weight: 600;
}

.app-main {
  flex: 1;
  max-width: var(--max-width-content);
  margin: var(--spacing-lg) auto;
  padding: 0 var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.app-footer {
  background-color: var(--color-secondary);
  color: #fff;
  text-align: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
}

.app-footer::after {
  content: '© 2026 Donau2Space.de';
  display: block;
  margin-top: var(--spacing-xs);
  opacity: 0.8;
}

@media (min-width: 640px) {
  .app-main {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .app-header,
  .app-footer {
    padding: var(--spacing-lg);
  }
  .app-main {
    padding: 0 var(--spacing-lg);
  }
}