/* ==========================================
   CSS Variables for Easy Customization
   ========================================== */
:root {
  /* Colors - Main palette for the site */
  --color-background: #ffffff;
  --color-text: #2c3e50;
  --color-text-secondary: #6c757d;
  --color-accent: #3498db;
  --color-accent-hover: #2980b9;
  --color-border: #e1e8ed;
  --color-code-bg: #f8f9fa;
  
  /* Typography - Font stacks optimized for readability */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
  
  /* Font sizes with responsive scaling */
  --font-size-base: 18px;
  --font-size-small: 0.875rem;
  --font-size-large: 1.125rem;
  --line-height-base: 1.7;
  
  /* Spacing - Consistent spacing throughout the site */
  --spacing-unit: 1rem;
  --max-width: 720px;  /* Optimal line length for readability */
  
  /* Transitions - Smooth animations for better UX */
  --transition-speed: 0.2s;
}

/* ==========================================
   Base Styles
   ========================================== */
/* Reset and base box model for consistent cross-browser rendering */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;  /* Smooth scrolling for anchor links */
}

body {
  font-family: var(--font-family-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;  /* Better font rendering on macOS/iOS */
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-top: calc(var(--spacing-unit) * 2);
  margin-bottom: var(--spacing-unit);
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  margin-top: 0;
}

h2 {
  font-size: 2rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

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

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

/* ==========================================
   Layout Container
   ========================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
  min-height: calc(100vh - 300px);
}

/* ==========================================
   Header
   ========================================== */
.site-header {
  text-align: center;
  padding: calc(var(--spacing-unit) * 3) var(--spacing-unit) calc(var(--spacing-unit) * 2);
  border-bottom: 1px solid var(--color-border);
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-title {
  font-family: "Baskerville", "Garamond", "Palatino Linotype", Palatino, serif;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.site-title a {
  color: var(--color-text);
  text-decoration: none;
}

.site-title a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.site-description {
  font-size: var(--font-size-large);
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

/* Header Navigation */
.site-header .site-nav {
  margin: calc(var(--spacing-unit) * 1) 0;
}

.site-header .site-nav a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  text-decoration: none;
  padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
  border-radius: 8px;
  margin: 0 calc(var(--spacing-unit) * 0.5);
  transition: all var(--transition-speed) ease;
}

.site-header .site-nav a:hover {
  color: var(--color-accent);
  background-color: var(--color-code-bg);
  text-decoration: none;
}

/* ==========================================
   Navigation
   ========================================== */
.site-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: calc(var(--spacing-unit) * 1.5);
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  text-decoration: none;
  padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
  border-radius: 8px;
  transition: all var(--transition-speed) ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
  background-color: var(--color-code-bg);
  text-decoration: none;
}

/* ==========================================
   Footer
   ========================================== */
.site-footer {
  text-align: center;
  padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--spacing-unit) * 4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-note {
  margin-top: var(--spacing-unit);
}

/* ==========================================
   Home Page
   ========================================== */
.home {
  margin-top: calc(var(--spacing-unit) * 2);
}

.page-title {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.posts {
  margin-top: calc(var(--spacing-unit) * 3);
}

.posts h2 {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

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

.post-item {
  margin-bottom: calc(var(--spacing-unit) * 2);
  padding-bottom: calc(var(--spacing-unit) * 2);
  border-bottom: 1px solid var(--color-border);
}

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

.post-date {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.post-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  display: inline-block;
  margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.post-link:hover {
  color: var(--color-accent);
}

.post-excerpt {
  color: var(--color-text-secondary);
  margin-top: calc(var(--spacing-unit) * 0.5);
  margin-bottom: calc(var(--spacing-unit) * 0.5);
}

/* Tags displayed in post listings */
.post-item .post-tags {
  display: flex;
  gap: calc(var(--spacing-unit) * 0.5);
  flex-wrap: wrap;
  margin-top: calc(var(--spacing-unit) * 0.5);
}

/* ==========================================
   Post Page
   ========================================== */
.post {
  margin-top: calc(var(--spacing-unit) * 2);
}

.post-header {
  text-align: center;
  margin-bottom: calc(var(--spacing-unit) * 3);
  padding-bottom: calc(var(--spacing-unit) * 2);
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  margin-bottom: calc(var(--spacing-unit) * 1);
}

.post-header .post-date {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  display: inline-block;
  margin-right: var(--spacing-unit);
}

.post-author {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.post-content {
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: calc(var(--spacing-unit) * 2) auto;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);  /* Subtle shadow for depth */
}

/* Prevent layout shift while images load */
.post-content img[width] {
  height: auto;
}

.post-content img[height] {
  width: auto;
}

.post-footer {
  padding-top: calc(var(--spacing-unit) * 2);
  border-top: 1px solid var(--color-border);
}

.post-tags {
  display: flex;
  gap: calc(var(--spacing-unit) * 0.5);
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 0.25) calc(var(--spacing-unit) * 0.75);
  background-color: var(--color-code-bg);
  color: var(--color-text-secondary);
  border-radius: 8px;
  font-size: var(--font-size-small);
}

/* ==========================================
   Post Navigation
   ========================================== */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: calc(var(--spacing-unit) * 3);
  padding-top: calc(var(--spacing-unit) * 2);
  border-top: 1px solid var(--color-border);
  gap: var(--spacing-unit);
}

.post-nav a {
  flex: 1;
  padding: var(--spacing-unit);
  background-color: var(--color-code-bg);
  border-radius: 8px;
  transition: background-color var(--transition-speed) ease;
}

.post-nav a:hover {
  background-color: var(--color-border);
  text-decoration: none;
}

.prev-post {
  text-align: left;
}

.next-post {
  text-align: right;
}

/* ==========================================
   Code Blocks
   ========================================== */
code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  background-color: var(--color-code-bg);
  border-radius: 6px;
  word-break: break-word;  /* Prevent overflow on long strings */
}

pre {
  background-color: var(--color-code-bg);
  padding: var(--spacing-unit);
  border-radius: 8px;
  overflow-x: auto;  /* Horizontal scroll for wide code blocks */
  margin-bottom: var(--spacing-unit);
  line-height: 1.5;  /* Tighter line height for code readability */
}

pre code {
  padding: 0;
  background-color: transparent;
}

/* ==========================================
   Blockquotes
   ========================================== */
blockquote {
  margin: calc(var(--spacing-unit) * 2) 0;
  padding-left: calc(var(--spacing-unit) * 1.5);
  border-left: 4px solid var(--color-accent);
  color: var(--color-text-secondary);
  font-style: italic;
}

/* ==========================================
   Lists
   ========================================== */
ul, ol {
  margin-bottom: var(--spacing-unit);
  padding-left: calc(var(--spacing-unit) * 2);
}

li {
  margin-bottom: calc(var(--spacing-unit) * 0.5);
}

/* ==========================================
   Tables
   ========================================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: calc(var(--spacing-unit) * 2);
}

th, td {
  padding: calc(var(--spacing-unit) * 0.75);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

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

/* ==========================================
   Horizontal Rule
   ========================================== */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: calc(var(--spacing-unit) * 3) 0;
}

/* ==========================================
   Responsive Design
   ========================================== */
/* Mobile-first responsive adjustments for tablets and phones */
@media (max-width: 768px) {
  :root {
    --font-size-base: 16px;  /* Slightly smaller base font on mobile */
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .post-link {
    font-size: 1.25rem;
  }
  
  /* Stack navigation links vertically on mobile */
  .post-nav {
    flex-direction: column;
  }
  
  .prev-post,
  .next-post {
    text-align: center;
  }
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
  /* Hide non-essential elements when printing */
  .site-header,
  .site-nav,
  .site-footer,
  .post-nav {
    display: none;
  }
  
  /* Optimize content for printing */
  body {
    color: #000;
    background: #fff;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
  
  /* Show URLs after links */
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
  
  /* Avoid page breaks inside elements */
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  pre, blockquote {
    page-break-inside: avoid;
  }
  
  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }
}