/* ============================================================================
   HolyBPF Documentation - Blueprint Theme
   A clean, professional grayscale theme with blueprint-inspired design
   ============================================================================ */

/* ============================================================================
   CSS Custom Properties (Variables)
   ============================================================================ */
:root {
  /* Colors - Grayscale Blueprint Palette */
  --color-primary: #000000;
  --color-secondary: #333333;
  --color-tertiary: #666666;
  --color-quaternary: #999999;
  --color-light: #cccccc;
  --color-lighter: #e6e6e6;
  --color-lightest: #f5f5f5;
  --color-white: #ffffff;
  
  /* Blueprint Colors */
  --color-blueprint-bg: #fafafa;
  --color-blueprint-grid: #e8e8e8;
  --color-blueprint-accent: #2c3e50;
  --color-blueprint-text: #2c3e50;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --content-max-width: 800px;
  --header-height: 70px;
  
  /* Borders and Shadows */
  --border-radius: 2px;
  --border-width: 1px;
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-medium: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ============================================================================
   Reset and Base Styles
   ============================================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-blueprint-text);
  background-color: var(--color-blueprint-bg);
  position: relative;
  overflow-x: hidden;
}

/* ============================================================================
   Blueprint Grid Background
   ============================================================================ */
.blueprint-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--color-blueprint-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-blueprint-grid) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: -1;
  opacity: 0.5;
}

/* ============================================================================
   Typography
   ============================================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background-color: var(--color-lighter);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--color-light);
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background-color: var(--color-lightest);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--color-light);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
  line-height: 1.4;
}

pre code {
  background-color: transparent;
  padding: 0;
  border: none;
}

blockquote {
  border-left: 4px solid var(--color-light);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-tertiary);
}

/* ============================================================================
   Buttons
   ============================================================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--border-radius);
  border: var(--border-width) solid;
  transition: all var(--transition-fast);
  cursor: pointer;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  color: var(--color-white);
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
  text-decoration: none;
}

/* ============================================================================
   Header and Navigation
   ============================================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: var(--border-width) solid var(--color-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.site-nav {
  height: var(--header-height);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
}

.brand-icon {
  margin-right: var(--spacing-sm);
  font-size: 1.5rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 2px 0;
  transition: var(--transition-fast);
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-secondary);
  padding: var(--spacing-sm) 0;
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-github {
  background-color: var(--color-primary);
  color: var(--color-white) !important;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--color-primary);
}

.nav-github:hover {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.nav-github::after {
  display: none;
}

/* ============================================================================
   Main Content
   ============================================================================ */
.site-main {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding-top: var(--spacing-xl);
}

.content-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.page-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  border-bottom: var(--border-width) solid var(--color-light);
  padding-bottom: var(--spacing-xl);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-tertiary);
  margin-bottom: 0;
}

/* ============================================================================
   Homepage Styles
   ============================================================================ */
.hero-section {
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-lightest) 100%);
  border-bottom: var(--border-width) solid var(--color-light);
  padding: var(--spacing-3xl) 0;
  margin-bottom: var(--spacing-3xl);
  text-align: center;
}

.hero-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-tertiary);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.content-grid {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.feature-card {
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  transition: all var(--transition-medium);
  position: relative;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
  border-color: var(--color-secondary);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.feature-card p {
  color: var(--color-tertiary);
  margin-bottom: var(--spacing-lg);
}

.card-link {
  font-weight: 500;
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 0.875rem;
}

.card-link:hover {
  color: var(--color-primary);
}

.highlights-section {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  text-align: center;
}

.highlights-section h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-2xl);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.highlight-item {
  padding: var(--spacing-lg);
}

.highlight-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.highlight-item p {
  color: var(--color-tertiary);
  margin-bottom: 0;
  font-size: 0.875rem;
}

/* ============================================================================
   Footer
   ============================================================================ */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

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

.footer-section a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-bottom {
  border-top: var(--border-width) solid var(--color-secondary);
  padding: var(--spacing-lg);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-light);
  font-size: 0.875rem;
  margin: 0;
}

/* ============================================================================
   Responsive Design
   ============================================================================ */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: var(--border-width) solid var(--color-light);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .highlights-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .content-container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-content {
    padding: 0 var(--spacing-md);
  }
  
  .content-grid {
    padding: 0 var(--spacing-md);
  }
  
  .highlights-section {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .feature-card {
    padding: var(--spacing-lg);
  }
}

/* ============================================================================
   Utility Classes
   ============================================================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

/* ============================================================================
   Documentation Navigation Styles
   ============================================================================ */
.doc-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: var(--border-width) solid var(--color-light);
  gap: var(--spacing-lg);
}

.nav-prev,
.nav-next {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-lightest);
  border: var(--border-width) solid var(--color-light);
  border-radius: var(--border-radius);
  text-decoration: none;
  color: var(--color-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
  max-width: 300px;
}

.nav-prev:hover,
.nav-next:hover {
  background-color: var(--color-light);
  border-color: var(--color-secondary);
  color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-prev {
  margin-right: auto;
}

.nav-next {
  margin-left: auto;
  text-align: right;
}

/* ============================================================================
   Print Styles
   ============================================================================ */
@media print {
  .blueprint-grid,
  .site-header,
  .site-footer,
  .nav-toggle,
  .hero-cta {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .site-main {
    padding-top: 0;
  }
}