/* ===================================
   Learn | Catalyst & Code Consulting
   Reading-focused theme
   =================================== */

/* CSS Variables - matching main site palette */
:root {
  --big-stone: #171f3a;
  --bon-jour: #eae8ea;
  --pelorous: #3ebdbc;
  --deep-blush: #e771a2;
  --wedgewood: #4b869d;
  --kimberly: #8275a7;
  --fuchsia-pink: #ac47a5;
  --tapestry: #b366a0;
  --affair: #783f7c;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

/* ===================================
   Global
   =================================== */

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

html {
  scroll-behavior: smooth;
  background-color: var(--big-stone);
}

body {
  font-family: var(--font-sans);
  background-color: var(--big-stone);
  color: var(--bon-jour);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--pelorous) 0%, var(--deep-blush) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  color: var(--bon-jour);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.02em;
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  color: var(--pelorous);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

h4 {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--wedgewood);
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

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

a {
  color: var(--pelorous);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--deep-blush);
}

ul, ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
}

li {
  margin-bottom: 0.25rem;
}

blockquote {
  border-left: 3px solid var(--kimberly);
  padding: var(--spacing-sm) var(--spacing-md);
  margin: var(--spacing-md) 0;
  background: rgba(75, 134, 157, 0.08);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: rgba(234, 232, 234, 0.85);
}

hr {
  border: none;
  border-top: 1px solid rgba(75, 134, 157, 0.2);
  margin: var(--spacing-lg) 0;
}

/* ===================================
   Header / Navigation
   =================================== */

.site-header {
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  background: rgba(23, 31, 58, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(75, 134, 157, 0.2);
  z-index: 50;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.site-logo img {
  height: 36px;
  width: auto;
}

.site-logo span {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bon-jour);
}

.site-nav {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid transparent;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.site-nav a:hover {
  border-color: var(--pelorous);
  box-shadow: 0 0 10px rgba(62, 189, 188, 0.3);
}

.site-nav a.nav-catalyst:hover {
  border-color: var(--pelorous);
  color: var(--pelorous);
}

.site-nav a.nav-code:hover {
  border-color: var(--deep-blush);
  color: var(--deep-blush);
}

.site-nav a.nav-main {
  border-color: rgba(75, 134, 157, 0.3);
  font-size: 0.75rem;
}

.site-nav a.nav-main:hover {
  border-color: var(--wedgewood);
  color: var(--wedgewood);
}

/* ===================================
   Landing Page
   =================================== */

.landing-hero {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.landing-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  text-transform: uppercase;
}

.landing-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--wedgewood);
  margin-top: var(--spacing-sm);
  letter-spacing: 0.05em;
}

.landing-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-md) 0 var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.section-card {
  padding: var(--spacing-md);
  border-radius: 8px;
  background: rgba(75, 134, 157, 0.05);
  border: 1px solid rgba(75, 134, 157, 0.2);
  transition: all 0.3s ease;
  text-decoration: none;
  display: block;
}

.section-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.section-card.catalyst {
  border-top: 3px solid var(--pelorous);
}

.section-card.catalyst:hover {
  border-color: var(--pelorous);
  box-shadow: 0 10px 30px rgba(62, 189, 188, 0.2);
}

.section-card.code {
  border-top: 3px solid var(--deep-blush);
}

.section-card.code:hover {
  border-color: var(--deep-blush);
  box-shadow: 0 10px 30px rgba(231, 113, 162, 0.2);
}

.section-card h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  font-size: 1.5rem;
}

.section-card.catalyst h2 {
  color: var(--pelorous);
}

.section-card.code h2 {
  color: var(--deep-blush);
}

.section-card p {
  color: var(--bon-jour);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* ===================================
   Section Index (List Pages)
   =================================== */

.section-header {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.section-header p {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.125rem;
  color: rgba(234, 232, 234, 0.85);
}

.article-list {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-md) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.article-card {
  padding: var(--spacing-md);
  background: rgba(75, 134, 157, 0.05);
  border: 1px solid rgba(75, 134, 157, 0.2);
  border-radius: 8px;
  transition: all 0.3s ease;
  text-decoration: none;
  display: block;
}

.article-card:hover {
  transform: translateX(5px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.catalyst .article-card {
  border-left: 3px solid var(--pelorous);
}

.catalyst .article-card:hover {
  border-color: var(--pelorous);
}

.code .article-card {
  border-left: 3px solid var(--deep-blush);
}

.code .article-card:hover {
  border-color: var(--deep-blush);
}

.article-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  color: var(--bon-jour);
}

.catalyst .article-card h3 {
  color: var(--pelorous);
}

.code .article-card h3 {
  color: var(--deep-blush);
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--wedgewood);
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.article-card p {
  color: rgba(234, 232, 234, 0.8);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* ===================================
   Single Article
   =================================== */

.article-header {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  max-width: 800px;
  margin: 0 auto;
}

.article-header .article-meta {
  margin-bottom: var(--spacing-sm);
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md) var(--spacing-xl);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: var(--spacing-md) 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
}

.article-body th,
.article-body td {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid rgba(75, 134, 157, 0.3);
  text-align: left;
}

.article-body th {
  background: rgba(75, 134, 157, 0.15);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Table of Contents */
.toc {
  background: rgba(75, 134, 157, 0.08);
  border: 1px solid rgba(75, 134, 157, 0.2);
  border-radius: 8px;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--wedgewood);
  margin-bottom: var(--spacing-xs);
}

.toc nav ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

.toc nav ul ul {
  padding-left: var(--spacing-sm);
  display: none;
}

.toc-expanded > ul {
  display: block !important;
}

.toc-has-children > a {
  cursor: pointer;
}

.toc-has-children > a::before {
  content: '\25b6';
  display: inline-block;
  margin-right: 0.4em;
  font-size: 0.7em;
  transition: transform 0.2s ease;
}

.toc-expanded > a::before {
  transform: rotate(90deg);
}

.toc nav a {
  font-size: 0.875rem;
  line-height: 1.8;
}

/* Section-specific accent colors for single articles */
article.code h3 {
  color: var(--deep-blush);
}

article.code a {
  color: var(--deep-blush);
}

article.code a:hover {
  color: var(--pelorous);
}

article.code code {
  color: var(--deep-blush);
}

article.code .toc {
  border-color: rgba(231, 113, 162, 0.2);
}

article.code :focus-visible {
  outline-color: var(--deep-blush);
}

/* ===================================
   Code Blocks
   =================================== */

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(75, 134, 157, 0.15);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--pelorous);
}

pre {
  margin: var(--spacing-md) 0;
  border-radius: 8px;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
  line-height: 1.6;
}

.highlight pre {
  background: rgba(23, 31, 58, 0.8);
  border: 1px solid rgba(75, 134, 157, 0.2);
  padding: var(--spacing-sm) var(--spacing-md);
}

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

.site-footer {
  padding: var(--spacing-md) 0;
  border-top: 1px solid rgba(75, 134, 157, 0.2);
  background: rgba(23, 31, 58, 0.95);
  text-align: center;
}

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

.site-footer a {
  color: var(--pelorous);
}

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

@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  .site-header .container {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
  }

  .site-nav a {
    font-size: 0.75rem;
    padding: 0.375rem 0.625rem;
  }

  .landing-sections {
    grid-template-columns: 1fr;
  }

  .article-body {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .container,
  .content-narrow {
    padding: 0 var(--spacing-sm);
  }

  h1 {
    font-size: 1.75rem;
  }

  .landing-hero {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
}

/* ===================================
   Accessibility
   =================================== */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

:focus-visible {
  outline: 2px solid var(--pelorous);
  outline-offset: 2px;
}

@media (prefers-contrast: high) {
  :root {
    --bon-jour: #ffffff;
    --big-stone: #000000;
  }
}