:root {
  --primary: #2a6fb0;
  --secondary: #f3f4f6;
  --text-color: #1c1c1c;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --font-base: 'Arial', sans-serif;
  --border-radius: 0.5rem;
  --breakpoint-md: 768px;
}

/* =============================
   Panel Layouts
   ============================= */

.data-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--secondary);
  border-radius: var(--border-radius);
  color: var(--text-color);
  font-family: var(--font-base);
}

.data-panel__section {
  background-color: #fff;
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.image-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  justify-content: center;
  background-color: var(--secondary);
  border-radius: var(--border-radius);
}

.image-gallery__item {
  flex: 1 1 calc(25% - var(--spacing-md));
  background-color: #fff;
  border-radius: var(--border-radius);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  position: relative;
}

.image-gallery__item:hover {
  outline: 2px solid var(--primary);
  cursor: zoom-in;
}

/* =============================
   Responsive Design
   ============================= */

@media (max-width: 768px) {
  .data-panel {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .image-gallery {
    flex-direction: column;
    align-items: center;
  }

  .image-gallery__item {
    flex: 1 1 100%;
    max-width: 90%;
  }
}

/* =============================
   Footer (Copyright)
   ============================= */

footer {
  text-align: center;
  padding: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--text-color);
  background-color: #e5e7eb;
}

footer p {
  margin: 0;
}

footer p::after {
  content: " © 2026 Donau2Space.de";
}