:root {
  --bg-color: #0d1117;
  --bg-surface: #161b22;
  --bg-subtle: #21262d;
  --border-color: #30363d;
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --accent-color: #58a6ff;
  --accent-hover: #79c0ff;
  --code-bg: #161b22;
  --tag-bg: #1f2937;
  --tag-text: #93c5fd;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max-width: 820px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #ffffff;
    --bg-surface: #f6f8fa;
    --bg-subtle: #eaeef2;
    --border-color: #d0d7de;
    --text-main: #1f2328;
    --text-muted: #656d76;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --code-bg: #f6f8fa;
    --tag-bg: #ddf4ff;
    --tag-text: #0969da;
  }
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-title {
  color: var(--text-main);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 0.75rem;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: var(--accent-color);
}

/* Main */
.site-main {
  padding: 48px 0;
}

/* Post list on home */
.hero {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.cadence-badge {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--accent-color);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 16px;
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.post-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.post-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

.post-card-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.post-card-title {
  font-size: 1.35rem;
  margin-bottom: 10px;
  line-height: 1.35;
}

.post-card-title a {
  color: var(--text-main);
  text-decoration: none;
}

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

.post-card-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
}

/* Article view */
.post-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.post-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.post-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.post-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
}

.post-content h2 {
  font-size: 1.55rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.post-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
}

.post-content p {
  margin-bottom: 20px;
}

.post-content ul, .post-content ol {
  margin-bottom: 20px;
  padding-left: 28px;
}

.post-content li {
  margin-bottom: 8px;
}

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

.post-content a:hover {
  text-decoration: underline;
}

.post-content blockquote {
  border-left: 4px solid var(--accent-color);
  background-color: var(--bg-surface);
  padding: 14px 20px;
  margin: 24px 0;
  border-radius: 0 6px 6px 0;
  color: var(--text-muted);
}

.post-content pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin: 24px 0;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.post-content pre code {
  background-color: transparent;
  padding: 0;
  border: none;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.post-content th, .post-content td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

.post-content th {
  background-color: var(--bg-surface);
}

/* Post footer */
.post-footer {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.post-footer-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.post-footer-card h3 {
  margin-bottom: 10px;
}

.post-footer-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.repo-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.9;
}

.btn-secondary {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.post-navigation a {
  color: var(--accent-color);
  text-decoration: none;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 32px 0;
  margin-top: 64px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

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

.footer-links a:hover {
  color: var(--accent-color);
}