/* ============================================
   Post Page Styles
   ============================================ */

.post {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

.post-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.post-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.post-tags a {
  padding: 0.25rem 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

.post-tags a:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

/* Post Content */
.post-content {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text);
}

.post-content h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-left: 1rem;
  border-left: 4px solid var(--color-accent);
  color: var(--color-text);
}

.post-content h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.post-content h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.post-content p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(37, 99, 235, 0.3);
  text-underline-offset: 2px;
  transition: all 0.2s ease;
}

.post-content a:hover {
  text-decoration-color: var(--color-accent);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  box-shadow: var(--shadow-md);
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.post-content pre {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  line-height: 1.5;
}

.post-content pre code {
  padding: 0;
  background: none;
  border: none;
  font-size: 0.9rem;
}

.post-content blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg);
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-content ul,
.post-content ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.post-content table {
  width: 100%;
  margin: 2rem 0;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.post-content th {
  background: var(--color-bg);
  font-weight: 600;
}

/* Math Formulas */
.post-content .katex,
.post-content .MathJax {
  font-size: 1.1em;
}

.post-content .katex-display,
.post-content .MathJax_Display {
  margin: 2rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* TOC */
.post-toc {
  position: fixed;
  right: 2rem;
  top: 150px;
  max-width: 250px;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.post-toc ul {
  list-style: none;
  padding-left: 0;
}

.post-toc li {
  margin-bottom: 0.5rem;
}

.post-toc a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Responsive */
@media (max-width: 1400px) {
  .post-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .post {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .post-title {
    font-size: 2rem;
  }
  
  .post-content {
    font-size: 1rem;
  }
  
  .post-content h2 {
    font-size: 1.5rem;
  }
  
  .post-content h3 {
    font-size: 1.25rem;
  }
}