/* ========================================
   Marty64 Knowledge Base - Main Styles
   ======================================== */

:root {
  /* Colors */
  --bg: #fafafa;
  --bg-alt: #f5f5f5;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --link: #2563eb;
  --link-hover: #1d4ed8;
  
  /* Register colors */
  --pedagogy-bg: #eff6ff;
  --pedagogy-border: #3b82f6;
  --pedagogy-text: #1e3a5f;
  
  --philosophy-bg: #faf5ff;
  --philosophy-border: #8b5cf6;
  --philosophy-text: #3b1f5c;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Lora', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  
  /* Layout */
  --content-width: 720px;
  --sidebar-width: 260px;
}

/* ========================================
   Reset & Base
   ======================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

.site-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: white;
  border-right: 1px solid var(--border);
  padding: var(--space-lg);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-2xl);
  max-width: calc(var(--content-width) + var(--space-2xl) * 2 + var(--sidebar-width));
}

.content-wrapper {
  max-width: var(--content-width);
}

/* ========================================
   Sidebar Navigation
   ======================================== */

.site-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-xs);
}

.nav-home {
  display: block;
  padding: 0.5rem 1rem;
  margin: 0.5rem 0 1rem 0;
  color: #f59e0b;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid #f59e0b;
  border-radius: 4px;
  text-align: center;
}

.nav-home:hover {
  background: #f59e0b;
  color: white;
}

.site-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
}

.search-box {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: var(--text-sm);
  margin-bottom: var(--space-xl);
}

.search-box:focus {
  outline: none;
  border-color: var(--link);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.nav-section {
  margin-bottom: var(--space-lg);
}

.nav-section-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.nav-list {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--space-xs);
}

.nav-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--text);
  text-decoration: none;
  font-size: var(--text-sm);
  border-radius: 4px;
  transition: background 0.15s;
}

.nav-link:hover {
  background: var(--bg-alt);
}

.nav-link.active {
  background: var(--bg-alt);
  font-weight: 500;
}

/* ========================================
   Typography
   ======================================== */

h1 {
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

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

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-alt);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: var(--space-md);
  border-radius: 6px;
  overflow-x: auto;
  margin: var(--space-md) 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: var(--text-sm);
}

/* Collapsible code blocks */
details.code-block {
  margin: var(--space-md) 0;
  border-radius: 6px;
  overflow: hidden;
}

details.code-block summary {
  background: #2d2d2d;
  color: #d4d4d4;
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
  border-radius: 6px;
}

details.code-block[open] summary {
  border-radius: 6px 6px 0 0;
}

details.code-block summary:hover {
  background: #3d3d3d;
}

details.code-block summary::before {
  content: '▶';
  font-size: 0.7em;
  transition: transform 0.2s ease;
}

details.code-block[open] summary::before {
  transform: rotate(90deg);
}

details.code-block summary::-webkit-details-marker {
  display: none;
}

details.code-block pre {
  margin: 0;
  border-radius: 0 0 6px 6px;
  max-height: 400px;
  overflow-y: auto;
}

/* Custom scrollbar for code blocks */
details.code-block pre::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

details.code-block pre::-webkit-scrollbar-track {
  background: #1e1e1e;
  border-radius: 0 0 6px 0;
}

details.code-block pre::-webkit-scrollbar-thumb {
  background: #4a4a4a;
  border-radius: 4px;
}

details.code-block pre::-webkit-scrollbar-thumb:hover {
  background: #5a5a5a;
}

blockquote {
  border-left: 3px solid var(--border);
  padding-left: var(--space-md);
  color: var(--text-muted);
  font-style: italic;
  margin: var(--space-md) 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-xl) 0;
}

/* ========================================
   Lists
   ======================================== */

ul, ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-xs);
}

/* ========================================
   Tables
   ======================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: var(--text-sm);
}

th, td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  background: var(--bg-alt);
}

/* ========================================
   Meta & Breadcrumbs
   ======================================== */

.breadcrumb {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--link);
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.tag {
  display: inline-block;
  background: var(--bg-alt);
  padding: 0.1em 0.5em;
  border-radius: 4px;
  font-size: var(--text-sm);
}

/* ========================================
   Register Legend
   ======================================== */

.register-legend {
  display: flex;
  gap: var(--space-lg);
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 3px;
}

.legend-swatch.student {
  background: white;
  border: 1px solid var(--border);
}

.legend-swatch.pedagogy {
  background: var(--pedagogy-bg);
  border-left: 3px solid var(--pedagogy-border);
}

.legend-swatch.philosophy {
  background: var(--philosophy-bg);
  border-left: 3px solid var(--philosophy-border);
}

/* ========================================
   Three Registers
   ======================================== */

/* Pedagogy Register */
.pedagogy {
  background: var(--pedagogy-bg);
  border-left: 4px solid var(--pedagogy-border);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  border-radius: 0 8px 8px 0;
}

.pedagogy-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  margin-bottom: var(--space-md);
  user-select: none;
}

.pedagogy-label {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pedagogy-border);
}

.pedagogy .toggle-icon {
  color: var(--pedagogy-border);
  font-size: var(--text-sm);
}

.pedagogy-content {
  color: var(--pedagogy-text);
}

.pedagogy-content.collapsed {
  display: none;
}

.pedagogy h3 {
  color: var(--pedagogy-border);
  margin-top: var(--space-lg);
}

.pedagogy h3:first-child {
  margin-top: 0;
}

/* Philosophy Register */
.philosophy {
  font-family: var(--font-serif);
  background: var(--philosophy-bg);
  border-left: 4px solid var(--philosophy-border);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  border-radius: 0 8px 8px 0;
  line-height: 1.8;
}

.philosophy-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  margin-bottom: var(--space-md);
  user-select: none;
  font-family: var(--font-sans);
}

.philosophy-label {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--philosophy-border);
  font-family: var(--font-sans);
}

.philosophy .toggle-icon {
  color: var(--philosophy-border);
  font-size: var(--text-sm);
}

.philosophy-content {
  color: var(--philosophy-text);
}

.philosophy-content.collapsed {
  display: none;
}

.philosophy h3 {
  color: var(--philosophy-border);
  font-family: var(--font-sans);
  margin-top: var(--space-lg);
}

.philosophy h3:first-child {
  margin-top: 0;
}

/* ========================================
   See Also / Related Links
   ======================================== */

.see-also {
  background: var(--bg-alt);
  padding: var(--space-lg);
  border-radius: 8px;
  margin: var(--space-xl) 0;
}

.see-also h3 {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

.see-also ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.see-also li {
  margin-bottom: var(--space-sm);
}

.see-also .arrow {
  color: var(--text-muted);
  margin-right: var(--space-sm);
}

/* ========================================
   Exercises Box
   ======================================== */

.exercises {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
}

.exercises h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

/* ========================================
   Search Results
   ======================================== */

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-height: 300px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}

.search-results.active {
  display: block;
}

.search-result-item {
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--bg-alt);
}

.search-result-title {
  font-weight: 500;
}

.search-result-section {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.search-wrapper {
  position: relative;
}

/* ========================================
   Mobile Navigation
   ======================================== */

.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
  width: 44px;
  height: 44px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.mobile-nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}

.mobile-nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
}

.mobile-nav-overlay.active {
  display: block;
}

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

@media (max-width: 900px) {
  .mobile-nav-toggle {
    display: flex;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    height: 100vh;
    width: 280px;
    z-index: 1000;
    transition: left 0.3s ease;
    box-shadow: 2px 0 12px rgba(0,0,0,0.15);
  }

  .sidebar.mobile-open {
    left: 0;
  }

  .main-content {
    margin-left: 0;
    padding: var(--space-lg);
    padding-top: calc(var(--space-lg) + 60px);
  }
}

@media (min-width: 901px) {
  .mobile-nav-toggle,
  .mobile-nav-overlay {
    display: none !important;
  }
}

/* ========================================
   Index Page Specific
   ======================================== */

.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.section-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-lg);
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.15s, border-color 0.15s;
}

.section-card:hover {
  border-color: var(--link);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  text-decoration: none;
}

.section-card h3 {
  margin: 0 0 var(--space-sm) 0;
  color: var(--link);
}

.section-card p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .sidebar {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .pedagogy-content,
  .philosophy-content {
    display: block !important;
  }
}