/* =======================================
   Reset and Variables
   ======================================= */

:root {
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-border: #d1d5db;
  --color-text: #1f2937;
  --color-primary: #2563eb;
  --color-accent: #f59e0b;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --font-base: 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-title: 1.5rem;
  --radius-sm: 4px;
  --transition-base: 0.2s ease-in-out;
  --bp-md: 640px;
  --bp-lg: 1024px;
}

html, body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
}

*, *::before, *::after {
  box-sizing: inherit;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

main {
  display: block;
}

/* =======================================
   Layout Containers
   ======================================= */

.app-header {
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.app-footer {
  text-align: center;
  padding: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.matrix-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-md);
}

.matrix-detail-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  overflow-y: auto;
}

@media (min-width: var(--bp-md)) {
  .matrix-container {
    grid-template-columns: 2fr 1fr;
  }
}

/* =======================================
   Controls and Form Elements
   ======================================= */

.run-selector {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-sm) 0;
}

.run-selector select {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color var(--transition-base);
}

.run-selector select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.control {
  display: inline-block;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.control:hover,
.control:focus {
  background-color: var(--color-accent);
}

/* =======================================
   Footer
   ======================================= */

.app-footer::after {
  content: "© 2026 Donau2Space.de";
  display: block;
  margin-top: var(--spacing-xs);
  font-size: 0.75rem;
  opacity: 0.7;
}