/* ==========================================================================
   LUADA Advertorial - Base Styles
   Minimalistisches, performantes CSS für schnelle Ladezeiten
   ========================================================================== */

/* CSS Custom Properties für einfache Anpassung */
:root {
  /* Farben */
  --color-primary: #1a5f7a;
  --color-primary-dark: #134b5f;
  --color-accent: #e07b39;
  --color-text: #2c3e50;
  --color-text-light: #5a6c7d;
  --color-background: #ffffff;
  --color-background-alt: #f8f9fa;
  --color-border: #e2e8f0;
  
  /* Typografie */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Layout */
  --max-width-content: 720px;
  --max-width-wide: 1200px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) var(--spacing-md);
}

.header-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-primary-dark);
}

.header-nav {
  display: flex;
  gap: var(--spacing-md);
}

.header-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.header-nav a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-background-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  margin-top: var(--spacing-xxl);
}

.footer-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  color: var(--color-text-light);
  font-size: 0.8125rem;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container--wide {
  max-width: var(--max-width-wide);
}

/* Responsive Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Links */
a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary);
  color: white;
}

.btn--accent {
  background: var(--color-accent);
  color: white;
}

.btn--accent:hover {
  background: #c96a2f;
  color: white;
}

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  
  .header-nav {
    gap: var(--spacing-sm);
  }
  
  .footer-nav {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
  }
  
  .site-logo {
    font-size: 1.1rem;
  }
}