/* ============================================
   UX/UI Improvements for Ilya Brin's Blog
   High Priority Quick Wins + Advanced Features
   ============================================ */

/* 1. SMOOTH SCROLL BEHAVIOR */
html {
  scroll-behavior: smooth;
}

/* 2. READING EXPERIENCE ENHANCEMENT */
article .content {
  line-height: 1.7 !important;
  font-size: 1.625rem !important;
}

article .content p {
  margin-bottom: 1.5em;
}

/* 3. IMPROVED TYPOGRAPHY HIERARCHY */
article .content h2 {
  font-size: 1.5em !important;
  margin-top: 2.5rem !important;
  margin-bottom: 1rem !important;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #e0e0e0;
}

article .content h3 {
  font-size: 1.5em !important;
  margin-top: 2rem !important;
  margin-bottom: 0.875rem !important;
}

article .content h4 {
  font-size: 1.25em !important;
  margin-top: 1.75rem !important;
  color: #5c8b59;
}

article .content h5 {
  font-size: 1.5em !important;
  margin-top: 1.5rem !important;
}

article .content h6 {
  font-size: 1.1em !important;
  font-weight: 600;
  margin-top: 1.5rem !important;
}

/* 4. ENHANCED FOCUS STATES FOR ACCESSIBILITY */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid #5c8b59;
  outline-offset: 2px;
  border-radius: 2px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* 5. SMOOTH TRANSITIONS */
a,
button,
.tags a,
.languages a {
  transition: all 0.2s ease-in-out;
}

article .content a:hover {
  color: #4a7c47 !important;
}

/* 6. CODE BLOCKS WITH LINE NUMBERS */
article .content pre {
  border-radius: 6px;
  /* padding: 1.5em !important; */
  /* margin: 1.5em 0; */
  background-color: #f6f8fa !important;
  border: 1px solid #e1e4e8;
  overflow-x: auto;
  position: relative;
  counter-reset: line;
}

/* Line numbers for code blocks */
article .content pre code {
  display: block;
  counter-reset: line;
}

article .content pre code .line {
  counter-increment: line;
  display: block;
}

article .content pre code .line::before {
  content: counter(line);
  display: inline-block;
  width: 2.5em;
  /* padding-right: 1em; */
  /* margin-right: 1em; */
  text-align: right;
  color: #999;
  border-right: 1px solid #ddd;
  user-select: none;
}

/* Alternative: Simple line numbers using Hugo's built-in highlighting */
.highlight pre {
  position: relative;
  /* padding-left: 3.5em !important; */
}

.highlight .ln {
  display: inline-block;
  width: 2.5em;
  text-align: right;
  margin-right: 1em;
  color: #999;
  user-select: none;
}

.highlight .lntd:first-child {
  padding-right: 0.5em;
}

.highlight .lntd:first-child pre {
  padding-left: 0.5em;
  padding-right: 0;
}

article .content code {
  font-family: "Fira Code", "Courier New", monospace;
  font-size: 0.9em;
}

article .content p code,
article .content li code {
  background-color: #f6f8fa;
  padding: 0.2em 0.4em;
  border-radius: 3px;
  border: 1px solid #e1e4e8;
  font-size: 0.875em;
}

/* 7. IMPROVED BLOCKQUOTE STYLING */
article .content blockquote {
  border-left: 4px solid #5c8b59 !important;
  background-color: #f9f9f9 !important;
  padding: 1.5em 2em !important;
  margin: 2em 0 !important;
  font-style: italic;
}

article .content blockquote p:first-child::before {
  content: '"';
  font-size: 2em;
  color: #5c8b59;
  margin-right: 0.1em;
  line-height: 0;
  vertical-align: -0.4em;
}

/* 8. READING PROGRESS BAR */
#reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #5c8b59 0%, #4a7c47 100%);
  z-index: 9999;
  transition: width 0.1s ease-out;
}

/* 9. BACK TO TOP BUTTON */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: #5c8b59;
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease-in-out;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

#back-to-top:hover {
  background-color: #4a7c47;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* 10. ENHANCED TABLE OF CONTENTS */
article .content #TableOfContents {
  background: #f9f9f9;
  border-left: 4px solid #5c8b59 !important;
  padding: 1.5rem !important;
  border-radius: 4px;
  margin-bottom: 2rem;
}

article .content #TableOfContents a {
  color: #333 !important;
  text-decoration: none;
  display: block;
  padding: 0.25em 0;
}

article .content #TableOfContents a:hover {
  color: #5c8b59 !important;
  padding-left: 0.5em;
  transition: all 0.2s ease-in-out;
}

/* 11. LAZY LOADING IMAGES - Visual Enhancement */
article .content img {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
}

article .content img:not([src]),
article .content img[src=""] {
  animation: shimmer 1.5s ease-in-out infinite;
}

article .content img[data-src] {
  animation: shimmer 1.5s ease-in-out infinite;
}

article .content img.loaded,
article .content img[src]:not([data-src]) {
  background: none;
  animation: none;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Fade-in effect for lazy loaded images */
article .content img {
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

article .content img.loaded,
article .content img[src]:not([data-src]) {
  opacity: 1;
}

/* 12. BETTER TOUCH TARGETS FOR MOBILE */
@media (max-width: 800px) {
  .tags .links a,
  .languages .links a,
  footer .container ul a {
    padding: 0.75em 0.5em;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  article .content {
    font-size: 1rem !important;
    padding: 1.5em !important;
  }

  article .content h1 {
    font-size: 1.6em !important;
  }

  article .content h2 {
    font-size: 1.45em !important;
  }

  article .content h3 {
    font-size: 1.3em !important;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 18px;
  }
}

/* 13. IMPROVED META SECTION READABILITY */
article .content .meta {
  font-size: 0.875em !important;
  color: #666 !important;
}

article .content .meta a:hover {
  color: #5c8b59 !important;
}

/* 14. BETTER LIST STYLING */
article .content ul,
article .content ol {
  margin: 1.5em 0;
  padding-left: 2em;
}

article .content li {
  margin-bottom: 0.75em;
  line-height: 1.7;
}

/* 15. IMAGE CAPTIONS */
article .content figure {
  margin: 2em 0;
}

article .content figcaption {
  text-align: center;
  font-style: italic;
  color: #666;
  font-size: 0.9em;
  margin-top: 0.5em;
}

/* 16. IMPROVED ARTICLE CARD HOVER EFFECT */
article {
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

/* article:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
} */

/* 17. SKIP TO CONTENT LINK (Accessibility) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #5c8b59;
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  z-index: 10000;
  transition: top 0.2s ease-in-out;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid #4a7c47;
  outline-offset: 2px;
}

/* 18. PRINT STYLES */
@media print {
  article {
    box-shadow: none !important;
  }

  article:before,
  article:after {
    display: none !important;
  }

  #back-to-top,
  #reading-progress-bar,
  nav,
  footer,
  .skip-link {
    display: none !important;
  }

  article .content a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  article .content code {
    page-break-inside: avoid;
  }
}

/* 19. SELECTION STYLING */
::selection {
  background-color: #5c8b59;
  color: white;
}

::-moz-selection {
  background-color: #5c8b59;
  color: white;
}

/* 20. IMPROVED FOOTER LINKS */
footer .container ul a {
  border-radius: 3px;
  padding: 0.5em 0;
}

footer .container ul a:hover {
  background-color: rgba(92, 139, 89, 0.05);
}

/* 21. OFFLINE INDICATOR */
.offline-indicator {
  position: fixed;
  bottom: 80px;
  right: 30px;
  background: #ff9800;
  color: white;
  padding: 0.75em 1.25em;
  border-radius: 4px;
  font-size: 0.9em;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease-in-out;
}

.offline-indicator.visible {
  opacity: 1;
  visibility: visible;
}

.offline-indicator::before {
  content: "📡 ";
}

/* 22. FONT LOADING OPTIMIZATION - Performance hint */
body {
  font-display: swap;
}

/* 23. CODE TABS - Multi-language code switcher */
.code-tabs {
  margin: 1.5em 0;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-tabs-nav {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  overflow-x: auto;
}

.code-tabs-nav button {
  padding: 8px 18px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: rgba(255, 255, 255, 0.55);
  font-family: "Fira Code", monospace;
  font-size: 0.82em;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s;
}

.code-tabs-nav button:hover {
  color: rgba(255, 255, 255, 0.85);
}

.code-tabs-nav button.active {
  color: #fff;
  border-bottom-color: #e74c3c;
}

.code-tab {
  display: none;
}

.code-tab.active {
  display: block;
}

.code-tab > div > pre,
.code-tab pre {
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
}