:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --text-muted: #666666;
  --accent-color: #0055ff;
  --border-color: #e5e5e5;
  --code-bg: #f5f5f5;
  --card-bg: #ffffff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f0f0f;
    --text-color: #ededed;
    --text-muted: #a0a0a0;
    --accent-color: #3377ff;
    --border-color: #333333;
    --code-bg: #1a1a1a;
    --card-bg: #141414;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  margin-bottom: 4rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-color);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

nav a {
  color: var(--text-muted);
  font-weight: 500;
}

nav a:hover, nav a.active {
  color: var(--text-color);
  text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-color);
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: 3rem; }
h3 { font-size: 1.5rem; margin-top: 2rem; }

p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

article {
  margin-bottom: 4rem;
}

.post-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.blog-list, .project-list {
  list-style: none;
}

.blog-item, .project-item {
  margin-bottom: 2rem;
}

.blog-item h3, .project-item h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.project-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  background-color: var(--card-bg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.project-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  background-color: var(--code-bg);
  color: var(--text-muted);
  border-radius: 4px;
  font-family: var(--font-mono);
}

code {
  font-family: var(--font-mono);
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.875em;
}

pre {
  background-color: var(--code-bg);
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

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

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Error page styles */
.error-page {
  text-align: center;
  padding: 4rem 0;
}

.error-page h1 {
  font-size: 4rem;
  color: var(--accent-color);
  margin-bottom: 0;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-color);
  color: #ffffff;
  border-radius: 6px;
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.btn:hover {
  opacity: 0.9;
  text-decoration: none;
  color: #ffffff;
}

/* Mobile adjustments */
@media (max-width: 600px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}