/* Base Styles */
body {
  font-family: 'Inter', sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
  margin: 0;
  padding: 2rem;
  line-height: 1.6;
}

/* External Links (icons) */
.external-links {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 3rem;
}

.external-links .image-container img {
  width: 90px;
  height: 90px;
  border-radius: 16px;
  box-shadow: 0 6px 12px rgba(0,0,0,0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#github-logo {
    background-color: black;
}

.external-links .image-container img:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

/* Section Title */
h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #111827;
  border-left: 6px solid #7c3aed; /* purple accent stripe */
  padding-left: 0.75rem;
}

/* Presentation Card */
.presentation {
  display: flex;
  gap: 1.5rem;
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.presentation:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

/* Thumbnail */
.thumbnail img {
  width: 240px;
  border-radius: 8px;
}

/* Description */
.description h1 {
  font-size: 1.3rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: #111827;
}

.description .summary {
  margin-bottom: 1rem;
  color: #4b5563;
}

/* Download Link */
.download-link a {
  color: #7c3aed; /* purple accent */
  text-decoration: none;
  font-weight: 500;
}

.download-link a:hover {
  color: #5b21b6;
  text-decoration: underline;
}

/* Recent Blogs on Main Page */
.recent-blogs {
  margin-bottom: 2rem;
}

.recent-blog-post {
  display: flex;
  gap: 1.5rem;
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.recent-blog-post .blog-thumbnail {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
}

.recent-blog-post .blog-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.recent-blog-post .blog-content {
  flex: 1;
}

.recent-blog-post:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
}

.recent-blog-post h3 {
  margin: 0 0 10px 0;
  font-size: 1.2rem;
  border-left: none;
  padding-left: 0;
}

.recent-blog-post h3 a {
  color: #111827;
  text-decoration: none;
}

.recent-blog-post h3 a:hover {
  color: #7c3aed;
  text-decoration: underline;
}

.recent-blog-post .blog-date {
  color: #6b7280;
  font-size: 0.9em;
  margin: 0 0 10px 0;
  font-weight: 500;
}

.recent-blog-post .blog-summary {
  color: #4b5563;
  line-height: 1.6;
  margin: 0;
}

.no-blogs {
  color: #6b7280;
  font-style: italic;
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

/* Blog Link on Main Page */
.blog-link {
  text-align: center;
  margin: 2rem 0 3rem 0;
}

.blog-link a {
  color: #7c3aed;
  text-decoration: none;
  font-weight: 500;
  font-size: 1.1rem;
}

.blog-link a:hover {
  color: #5b21b6;
  text-decoration: underline;
}

/* Blog Styles */
.blog-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.blog-header {
  text-align: center;
  margin-bottom: 40px;
}

.blog-header h1 {
  color: #111827;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 10px;
  border-left: none;
  padding-left: 0;
}

.blog-post {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  line-height: 1.6;
}

.blog-post h1 {
  color: #111827;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 10px;
  border-left: none;
  padding-left: 0;
}

.blog-post h2 {
  color: #1f2937;
  margin-top: 30px;
  border-left: 4px solid #7c3aed;
  padding-left: 0.75rem;
}

.blog-post h3 {
  color: #374151;
  margin-top: 25px;
  border-left: 3px solid #a855f7;
  padding-left: 0.5rem;
}

.blog-post h4 {
  color: #4b5563;
  margin-top: 20px;
  border-left: 2px solid #a855f7;
  padding-left: 0.5rem;
}

.blog-post h5 {
  color: #6b7280;
  margin-top: 15px;
  font-size: 1.1rem;
}

.blog-post h6 {
  color: #9ca3af;
  margin-top: 10px;
  font-size: 1rem;
}

.blog-post p {
  margin-bottom: 15px;
  color: #4b5563;
}

.blog-post pre {
  background: #f3f4f6;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  border-left: 4px solid #7c3aed;
  line-height: 1.4;
}

.blog-post code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
}

.blog-post pre code {
  background: none;
  padding: 0;
  line-height: 1.4;
}

.blog-post ul {
  margin-bottom: 15px;
  color: #4b5563;
}

.blog-post li {
  margin-bottom: 5px;
}

.blog-post a {
  color: #7c3aed;
  text-decoration: none;
  font-weight: 500;
}

.blog-post a:hover {
  color: #5b21b6;
  text-decoration: underline;
}

.blog-post-preview {
  display: flex;
  gap: 1.5rem;
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-post-preview .blog-thumbnail {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  border-radius: 8px;
  overflow: hidden;
}

.blog-post-preview .blog-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-post-preview .blog-content {
  flex: 1;
}

.blog-post-preview:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
}

.blog-post-preview h2 {
  margin: 0 0 10px 0;
  border-left: none;
  padding-left: 0;
}

.blog-post-preview h2 a {
  color: #111827;
  text-decoration: none;
}

.blog-post-preview h2 a:hover {
  color: #7c3aed;
  text-decoration: underline;
}

.blog-date {
  color: #6b7280;
  font-size: 0.9em;
  margin: 0 0 10px 0;
  font-weight: 500;
}

.blog-summary {
  color: #4b5563;
  line-height: 1.6;
  margin: 0;
}

.blog-navigation {
  text-align: center;
  margin: 20px 0;
  padding: 20px;
}

.blog-navigation a {
  color: #7c3aed;
  text-decoration: none;
  font-weight: 500;
  margin: 0 10px;
}

.blog-navigation a:hover {
  color: #5b21b6;
  text-decoration: underline;
}

/* Table of Contents */
.table-of-contents {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 30px;
}

.table-of-contents .toc-checkbox {
  display: none;
}

.table-of-contents .toc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 15px 0;
  color: #111827;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  transition: color 0.2s ease;
  border-left: none;
  padding-left: 0;
}

.table-of-contents .toc-header:hover {
  color: #7c3aed;
}

.table-of-contents .toc-arrow {
  font-size: 0.8em;
  color: #7c3aed;
  transition: transform 0.2s ease;
}

.table-of-contents .toc-arrow::before {
  content: "▶";
}

.table-of-contents .toc-checkbox:checked + .toc-header .toc-arrow::before {
  content: "▼";
}

.table-of-contents .toc-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  margin: 0;
  padding: 0;
  list-style: none;
}

.table-of-contents .toc-checkbox:checked ~ .toc-content {
  max-height: 1000px;
}

.table-of-contents ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.table-of-contents li {
  margin: 0;
  padding: 4px 0;
}

.table-of-contents a {
  color: #4b5563;
  text-decoration: none;
  font-size: 0.95em;
  line-height: 1.4;
  display: block;
  padding: 2px 0;
  transition: color 0.2s ease;
}

.table-of-contents a:hover {
  color: #7c3aed;
  text-decoration: underline;
}

/* TOC indentation levels */
.toc-level-1 a {
  font-weight: 600;
  color: #111827;
}

.toc-level-2 a {
  padding-left: 20px;
  color: #374151;
  font-weight: 500;
}

.toc-level-3 a {
  padding-left: 40px;
  color: #4b5563;
}

.toc-level-4 a {
  padding-left: 60px;
  color: #6b7280;
  font-size: 0.9em;
}

.toc-level-5 a {
  padding-left: 80px;
  color: #6b7280;
  font-size: 0.85em;
}

.toc-level-6 a {
  padding-left: 100px;
  color: #9ca3af;
  font-size: 0.8em;
}

/* Blog Footer */
.blog-footer {
  text-align: center;
  margin: 40px 20px 20px 20px;
  padding: 20px;
  border-top: 1px solid #e5e7eb;
  background: #f9fafb;
  border-radius: 8px;
}

.blog-footer p {
  margin: 0;
  color: #6b7280;
  font-size: 0.9em;
}

.blog-footer a {
  color: #7c3aed;
  text-decoration: none;
  font-weight: 500;
}

.blog-footer a:hover {
  color: #5b21b6;
  text-decoration: underline;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .presentation {
    flex-direction: column;
    align-items: center;
  }

  .thumbnail img {
    width: 100%;
    max-width: 400px;
  }

  .description {
    text-align: center;
  }

  .blog-container,
  .blog-post {
    padding: 15px;
  }

  .blog-navigation {
    padding: 15px;
  }

  .blog-navigation a {
    display: block;
    margin: 5px 0;
  }

  /* Stack blog thumbnails vertically on mobile */
  .recent-blog-post,
  .blog-post-preview {
    flex-direction: column;
  }

  .recent-blog-post .blog-thumbnail,
  .blog-post-preview .blog-thumbnail {
    width: 100%;
    height: 200px;
    margin-bottom: 1rem;
  }
}