/* ============================================
   KUEPER.COM HOMEPAGE STYLES
   Scientific Monochrome Design System
   ============================================ */

/* === GLOBAL RESET === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* === ROOT VARIABLES === */
:root {
  /* Colors - Scientific Monochrome */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #525252;
  --color-border: #e5e5e5;
  --color-accent: #171717;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  
  /* Borders */
  --border-radius: 4px;
  --border-width: 1px;
}

/* === BASE STYLES === */
body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === HOMEPAGE LAYOUT === */
.homepage {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-md);
}

/* === HERO SECTION === */
.hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl) 0;
  border-bottom: var(--border-width) solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.hero-icon {
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

.hero-icon svg {
  display: inline-block;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* === HERO STATS === */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === CATEGORIES SECTION === */
.categories-section {
  margin-bottom: var(--space-2xl);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

/* === CATEGORY CARD === */
.category-card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  display: block;
}

.category-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.category-code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.category-count {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.category-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.category-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* === ABOUT PREVIEW === */
.about-preview {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.about-preview h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

.about-preview p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.cta-link {
  display: inline-block;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  transition: opacity 0.2s ease;
}

.cta-link:hover {
  opacity: 0.7;
}

/* === FOOTER === */
.site-footer {
  border-top: var(--border-width) solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-accent);
}

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

.footer-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

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

.footer-credit {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-stats {
    gap: var(--space-lg);
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .categories-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: var(--space-sm);
  }
}