/* CSS Variables for theming */
:root {
  --color-bg: #fff;
  --color-text: #1a1a1a;
  --color-heading: #1a1a1a;
  --color-link: #6B46C1;
  --color-link-hover: #553C9A;
  --color-border: #e5e5e5;
  --color-code-bg: #f5f5f5;
  --color-code-text: #1a1a1a;
  --color-tag-bg: #f0f0f0;
  --color-tag-text: #666;
  --max-width: 800px;
  --spacing: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-text: #e5e5e5;
    --color-heading: #fff;
    --color-link: #A78BFA;
    --color-link-hover: #C4B5FD;
    --color-border: #333;
    --color-code-bg: #2a2a2a;
    --color-code-text: #e5e5e5;
    --color-tag-bg: #333;
    --color-tag-text: #ccc;
  }
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  padding: var(--spacing) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: calc(var(--spacing) * 2);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

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

.nav-logo:hover {
  color: var(--color-link);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing);
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-link);
}

/* Main content */
.main {
  flex: 1;
  padding-bottom: calc(var(--spacing) * 2);
}

/* Hero section */
.hero {
  text-align: center;
  padding: calc(var(--spacing) * 3) 0;
  margin-bottom: calc(var(--spacing) * 3);
}

.hero-title {
  font-size: 3rem;
  font-weight: bold;
  color: var(--color-heading);
  margin-bottom: var(--spacing);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text);
  opacity: 0.8;
}

/* Posts listing */
.posts {
  margin-bottom: calc(var(--spacing) * 3);
}

.posts-title {
  font-size: 2rem;
  margin-bottom: var(--spacing);
  color: var(--color-heading);
}

.posts-list {
  list-style: none;
}

.posts-item {
  margin-bottom: calc(var(--spacing) * 1.5);
  padding-bottom: calc(var(--spacing) * 1.5);
  border-bottom: 1px solid var(--color-border);
}

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

.post-preview-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.post-preview-title a {
  color: var(--color-heading);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.post-preview-date {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

.post-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin-top: 0.5rem;
}

.post-preview-tag {
  font-size: 0.85rem;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 4px;
}

/* Projects section */
.projects {
  margin-top: calc(var(--spacing) * 3);
  padding-top: calc(var(--spacing) * 2);
  border-top: 1px solid var(--color-border);
}

.projects-title {
  font-size: 2rem;
  margin-bottom: var(--spacing);
  color: var(--color-heading);
}

.projects-list {
  list-style: none;
}

.projects-list li {
  margin-bottom: 0.5rem;
}

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

.projects-list a:hover {
  text-decoration: underline;
}

/* Post page */
.post {
  max-width: 100%;
}

.post-header {
  margin-bottom: calc(var(--spacing) * 2);
  padding-bottom: var(--spacing);
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--color-heading);
  margin-bottom: 0.5rem;
}

.post-date {
  display: block;
  font-size: 1rem;
  color: var(--color-text);
  opacity: 0.7;
  margin-bottom: var(--spacing);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.post-tag {
  font-size: 0.9rem;
  padding: 0.35rem 0.85rem;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 4px;
}

.post-content {
  line-height: 1.8;
}

.post-content h2 {
  font-size: 2rem;
  margin-top: calc(var(--spacing) * 2);
  margin-bottom: var(--spacing);
  color: var(--color-heading);
}

.post-content h3 {
  font-size: 1.5rem;
  margin-top: calc(var(--spacing) * 1.5);
  margin-bottom: 0.75rem;
  color: var(--color-heading);
}

.post-content h4 {
  font-size: 1.25rem;
  margin-top: var(--spacing);
  margin-bottom: 0.5rem;
  color: var(--color-heading);
}

.post-content p {
  margin-bottom: var(--spacing);
}

.post-content ul,
.post-content ol {
  margin-left: calc(var(--spacing) * 1.5);
  margin-bottom: var(--spacing);
}

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

.post-content a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.post-content a:hover {
  border-bottom-color: var(--color-link);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: var(--spacing) 0;
}

.post-content blockquote {
  border-left: 4px solid var(--color-link);
  padding-left: var(--spacing);
  margin: var(--spacing) 0;
  font-style: italic;
  opacity: 0.9;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: calc(var(--spacing) * 2) 0;
}

.post-content center {
  text-align: center;
}

.post-content center i {
  font-style: italic;
  opacity: 0.7;
}

/* Code blocks */
.post-content pre {
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--spacing);
  border-radius: 4px;
  overflow-x: auto;
  margin: var(--spacing) 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.post-content code {
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
}

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

/* Footer */
.footer {
  padding: calc(var(--spacing) * 2) 0;
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--spacing) * 2);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text);
  opacity: 0.7;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing);
  list-style: none;
  margin-top: var(--spacing);
}

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

.footer-links a:hover {
  text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
  :root {
    --spacing: 1rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .post-title {
    font-size: 2rem;
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing);
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }
}