:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #12161f;
  --bg-card: #181d28;
  --border-subtle: #242c3d;
  --border-active: #3b465c;
  --text-main: #f0f3f8;
  --text-muted: #8e98a8;
  --text-dim: #5c667a;
  --accent-amber: #f59e0b;
  --accent-amber-light: #fbbf24;
  --accent-blue: #3b82f6;
  --accent-green: #10b981;
  --font-sans: 'Albert Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-title {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-title span {
  color: var(--accent-amber);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* Post List */
.feed-header {
  margin-bottom: 3rem;
}

.feed-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.feed-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.post-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
  display: block;
}

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

.post-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.post-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.post-card-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Single Post */
.article-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 2rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.back-link:hover {
  color: var(--accent-amber);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.article-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.article-meta-left {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.substack-btn {
  background: var(--bg-card);
  border: 1px solid var(--accent-amber);
  color: var(--accent-amber);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s;
}

.substack-btn:hover {
  background: var(--accent-amber);
  color: var(--bg-primary);
}

/* Article Content Markdown Typography */
.article-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #d1d7e0;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--text-main);
}

.article-body h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--accent-amber-light);
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin: 0 0 1.5rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body a {
  color: var(--accent-amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body code {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: var(--font-mono);
  color: #ffc97a;
}

.article-body pre {
  background: #0d1117;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e6edf3;
  font-size: 0.9rem;
}

.article-body blockquote {
  border-left: 3px solid var(--accent-amber);
  padding-left: 1rem;
  color: var(--text-muted);
  margin: 1.5rem 0;
  font-style: italic;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 2.5rem 0;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}