/* Base variables */
:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --link-color: #e74c3c;
  --header-color: #ffffff;
  --border-color: #333333;
  --code-bg: #1e1e1e;
  --meta-color: #999999;
}

/* Base styles */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header & Navigation */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  padding-top: 20px;
  margin-top: 15px
}

.logo a {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--header-color);
  text-decoration: none;
}

nav a {
  margin-left: 1rem;
  color: var(--text-color);
  text-decoration: none;
}

nav a:hover {
  color: var(--link-color);
  text-decoration: none;
}

/* Posts list (homepage) */
.posts {
  max-width: 800px;
  margin: 0 auto;
}

.post-preview {
  margin-bottom: 3rem;
}

.post-preview .post-title {
  margin-bottom: 0.5rem;
}

.post-preview .post-title a {
  color: var(--header-color);
  text-decoration: none;
  font-size: 1.8rem;
}

.post-preview .post-title a:hover {
  color: var(--link-color);
}

.post-meta {
  color: var(--meta-color);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.post-summary {
  margin-top: 1rem;
}

.read-more {
  color: var(--link-color);
  text-decoration: none;
  font-weight: bold;
}

.read-more:hover {
  text-decoration: underline;
}

/* Three-column layout for posts */
.post-container {
  display: grid;
  grid-template-columns: 200px minmax(0, 800px) 1fr;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Left TOC column */
.toc-column {
  padding-right: 20px;
  padding-top: 60px;
  position: sticky;
  top: 20px;
  align-self: start;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.back-link {
  display: block;
  margin-bottom: 20px;
  color: var(--text-color);
  text-decoration: none;
  font-size: 14px;
}

.back-link:hover {
  color: var(--link-color);
  text-decoration: none;
}

.toc-nav {
  margin-top: 20px;
}

.toc-item {
  margin-bottom: 15px;
  font-size: 14px;
}

.toc-item a {
  color: var(--meta-color);
  text-decoration: none;
  transition: color 0.2s;
}

.toc-item a:hover {
  color: var(--text-color);
  text-decoration: none;
}

.sub-item {
  margin-left: 15px;
}

.sub-sub-item {
  margin-left: 30px;
}

/* Main content column */
.content-column {
  min-width: 0;
  max-width: 800px;
}

.content-column h1.post-title {
  margin-top: 60px;
  margin-bottom: 10px;
  font-size: 2.2rem;
}

.content-column .post-meta {
  margin-bottom: 30px;
}

.content-column h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.8rem;
}

.content-column h3 {
  margin-top: 1.8rem;
  margin-bottom: 0.8rem;
  font-size: 1.4rem;
}

.post-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: var(--meta-color);
  font-size: 14px;
}

/* Right column - currently empty */
.right-column {
  /* You can add content here in the future if needed */
}

/* Code styling */
pre {
  background-color: var(--code-bg);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
  margin: 1.5rem 0;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9rem;
  background-color: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
}

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

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.9rem;
  color: var(--meta-color);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}

.pagination a {
  color: var(--link-color);
  text-decoration: none;
}

/* Responsive design */
@media (max-width: 1024px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .content-column {
    width: 100%;
  }
  
  nav {
    margin-top: 1rem;
  }
  
  nav a {
    margin-left: 0;
    margin-right: 1rem;
  }
  
  .post-container {
    grid-template-columns: 1fr;
  }
  
  .toc-column {
    display: none;
  }
  
  .toc-item {
    margin-bottom: 0;
  }
  
  .sub-item, .sub-sub-item {
    margin-left: 0;
  }
  
  .content-column h1.post-title {
    margin-top: 20px;
  }
}

/* Image sizing */
.small-img {
  max-width: 300px;
  height: auto;
}

.medium-img {
  max-width: 500px;
  height: auto;
}

.large-img {
  max-width: 800px;
  height: auto;
}

/* Center images */
.center-img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}