/*
 * blog.css
 *
 * Blog index page styles adapted from blogStyles.css reference implementation.
 * Uses Google fonts Montserrat (for headings and metadata) and Source Serif 4 
 * (for body copy). Displays a list of blog articles with sidebar navigation.
 */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700;900&family=Source+Serif+4:wght@400;600;700&display=swap');

/* Root variables for consistent theming */
:root {
  /* Font families */
  --font-sans: 'Montserrat', sans-serif;
  --font-serif: 'Source Serif 4', serif;
  /* Text colours */
  --color-text: #1a1a1a;
  --color-secondary: #374151;
  --color-muted: #6b7280;
  --color-accent: #000000;
  --color-border: #e5e7eb;
  /* Layout */
  --content-max-width: 60rem;
  --content-width: 90%;
  /* Sidebar sizing */
  --sidebar-width: 240px;
  --sidebar-gap: 3rem;
}

/* Page-level styles */
.blog-page {
  min-height: 100vh;
  background-color: #ffffff;
  font-family: var(--font-serif);
  color: var(--color-text);
  line-height: 1.6;
  padding: 2rem 0;
}

/* Blog header */
.blog-header {
  text-align: center;
  margin-bottom: 3rem;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding: 0 1rem;
}

.blog-page-title {
  font-family: var(--font-sans);
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.blog-page-subtitle {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  color: var(--color-secondary);
  max-width: 32rem;
  margin: 0 auto;
}

/* Blog layout container */
.blog-layout {
  width: var(--content-width);
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding: 0 1rem;
}

/* Main content area */
.blog-main {
  width: 100%;
}

/* Blog post container */
.blog-post {
  width: 100%;
  margin-bottom: 4rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-post:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

/* Typography hierarchy */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-family: var(--font-sans);
  line-height: 1.25;
  color: var(--color-accent);
}

.blog-title {
  font-size: 2.25rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.blog-subtitle {
  font-size: 1.25rem;
  color: var(--color-secondary);
  margin-bottom: 1rem;
  font-weight: 400;
}

.blog-date {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  font-family: var(--font-sans);
}

/* Tags styling */
.blog-tags {
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blog-tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background-color: #f3f4f6;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Blog content area */
.blog-content {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.75rem;
  text-align: justify;
}

.blog-content p {
  margin-bottom: 1.25rem;
}

.blog-content h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 2rem;
}

.blog-content h3 {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.75rem;
}

.blog-content a {
  color: var(--color-accent);
  text-decoration: underline;
}

.blog-content ul, .blog-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.blog-content li {
  margin-bottom: 0.5rem;
}

/* Figure and media styling */
.blog-content figure {
  margin: 2rem 0;
  text-align: center;
}

.blog-content figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 0.25rem;
}

.blog-content figcaption {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
  font-style: italic;
}

/* Video container for responsive embeds */
.blog-content .video-container {
  position: relative;
  margin: 2rem 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: 0.25rem;
}

.blog-content .video-container iframe,
.blog-content .video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Sidebar styling */
.blog-sidebar {
  margin-bottom: 2rem;
}

/* Responsive layout for larger screens */
@media (min-width: 1024px) {
  .blog-sidebar {
    position: sticky;
    top: 4rem;
    width: var(--sidebar-width);
    margin-bottom: 0;
    order: 2;
  }
}

/* Responsive layout for larger screens */
@media (min-width: 1024px) {
  .blog-layout {
    display: flex;
    align-items: flex-start;
    gap: var(--sidebar-gap);
  }
  
  .blog-main {
    width: calc(100% - var(--sidebar-width) - var(--sidebar-gap));
    order: 1;
  }
  
  .blog-sidebar {
    position: sticky;
    top: 4rem;
    width: var(--sidebar-width);
    margin-bottom: 0;
    order: 2;
  }
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .blog-page {
    padding: 1rem 0;
  }
  
  .blog-header {
    margin-bottom: 2rem;
  }
  
  .blog-page-title {
    font-size: 2.25rem;
  }
  
  .blog-page-subtitle {
    font-size: 1.125rem;
  }
  
  .blog-post {
    margin-bottom: 3rem;
    padding-bottom: 3rem;
  }
  
  .blog-title {
    font-size: 1.875rem;
  }
  
  .blog-subtitle {
    font-size: 1.125rem;
  }
  
  .blog-content {
    font-size: 1rem;
    line-height: 1.625rem;
    text-align: left;
  }
  
  .blog-content h2 {
    font-size: 1.5rem;
  }
  
  .blog-content h3 {
    font-size: 1.25rem;
  }
}

/* Individual Article Page Navigation */
.article-nav {
  text-align: left;
  margin-bottom: 2rem;
}

.back-to-blog {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.back-to-blog:hover {
  color: var(--color-accent);
}

.article-footer {
  text-align: center;
  padding: 3rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--color-border);
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  width: var(--content-width);
}

.view-all-articles {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-secondary);
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  transition: all 0.2s ease;
}

.view-all-articles:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: #f9fafb;
}

/* Single article page - full width since no sidebar */
.blog-main-single {
  width: 100%;
  max-width: 45rem;
  margin: 0 auto;
}

/* Table of Contents Component Styles - Swiss Design */

.toc-container {
  font-family: var(--font-sans);
  background-color: #ffffff;
  border: 2px solid #000000;
  padding: 0;
  margin: 0;
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: #000000;
  margin: 0;
  padding: 1rem 1.5rem 0.75rem 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  border-bottom: 1px solid #000000;
  background-color: #f8f8f8;
}

.toc-content {
  max-height: 400px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  background-color: #ffffff;
  padding: 0;
}

.toc-content::-webkit-scrollbar {
  display: none;
}

/* Year Group Styles */
.toc-year-group {
  margin: 0;
  border-bottom: 1px solid #e0e0e0;
}

.toc-year-group:last-child {
  border-bottom: none;
}

.toc-year-header {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.75rem 1.5rem;
  background-color: #f8f8f8;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  color: #000000;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  transition: background-color 0.15s ease;
  position: relative;
}

.toc-year-header:hover {
  background-color: #f0f0f0;
}

.toc-year-header:focus {
  outline: 2px solid #000000;
  outline-offset: -2px;
}

.toc-year-title {
  font-weight: 700;
  font-size: 0.875rem;
}

.toc-year-count {
  color: #666666;
  font-weight: 400;
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  margin-left: 0.5rem;
}

.toc-year-toggle {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  border: 1px solid #000000;
  background-color: #ffffff;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toc-year-toggle svg {
  display: block;
}

/* Year Articles List */
.toc-year-articles {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid #e0e0e0;
  background-color: #fafafa;
}

/* Article Link Styles */
.toc-article-item {
  margin: 0;
  border-bottom: 1px solid #f0f0f0;
}

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

.toc-article-link {
  display: block;
  text-decoration: none;
  padding: 0.5rem 1.5rem 0.5rem 2.5rem;
  transition: background-color 0.15s ease;
  position: relative;
  border: none;
  outline: none;
}

.toc-article-link:hover {
  background-color: #f0f0f0;
}

.toc-article-link:focus {
  outline: 2px solid #000000;
  outline-offset: -2px;
}

.toc-article-link.active,
.toc-article-link.active:focus {
  background-color: #000000;
  color: #ffffff;
  outline: none;
}

.toc-article-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: #ffffff;
}

.toc-article-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: #000000;
  display: block;
  margin-bottom: 0.125rem;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.toc-article-link.active .toc-article-title {
  color: #ffffff;
  font-weight: 600;
}

.toc-article-date {
  font-size: 0.6875rem;
  color: #666666;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.toc-article-link.active .toc-article-date {
  color: #cccccc;
}

/* Responsive Design */
@media (min-width: 1024px) {
  .toc-container {
    position: sticky;
    top: 4rem;
    background-color: transparent;
    border: none;
    padding: 0;
  }

  .toc-content {
    max-height: 500px;
  }
}

/* Mobile Optimizations */
@media (max-width: 768px) {
  .toc-container {
    border-width: 1px;
  }

  .toc-title {
    padding: 0.75rem 1rem 0.5rem 1rem;
    font-size: 0.6875rem;
  }

  .toc-content {
    max-height: 300px;
  }

  .toc-year-header {
    padding: 0.5rem 1rem;
    font-size: 0.6875rem;
  }

  .toc-year-toggle {
    right: 1rem;
    width: 0.875rem;
    height: 0.875rem;
    font-size: 0.6875rem;
  }

  .toc-article-link {
    padding: 0.375rem 1rem 0.375rem 1.75rem;
  }

  .toc-article-title {
    font-size: 0.8125rem;
  }

  .toc-article-date {
    font-size: 0.625rem;
  }
}

/* Animation for expanding/collapsing */
.toc-year-articles {
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Smooth scrolling for ToC content */
.toc-content {
  scroll-behavior: smooth;
}

/* Vanilla blog additions */
html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

.blog-title-link {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.blog-title-link:hover,
.blog-title-link:focus {
  opacity: 0.72;
}

.blog-stream-status {
  min-height: 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.blog-stream-sentinel {
  width: 100%;
  height: 1px;
}

.toc-year-articles[hidden] {
  display: none;
}