:root {
  --blog-blue: #0055ff;
  --blog-ink: #0d0e1a;
  --blog-text: #2a2c3a;
  --blog-muted: #6b6f80;
  --blog-border: #e1e1ef;
  --blog-bg: #ffffff;
  --blog-bg-soft: #f7f7fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--blog-text);
  background: var(--blog-bg);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.blog-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--blog-border);
}

.blog-header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.blog-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--blog-ink);
}

.blog-brand:hover {
  text-decoration: none;
}

.blog-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.9rem;
}

.blog-nav a {
  color: var(--blog-muted);
}

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

.blog-nav .blog-cta {
  background: var(--blog-blue);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
}

.blog-nav .blog-cta:hover {
  background: #0041c8;
  text-decoration: none;
}

.blog-main {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.blog-index h1,
.post h1 {
  color: var(--blog-ink);
  letter-spacing: -0.02em;
}

.blog-index-intro {
  color: var(--blog-muted);
  font-size: 1.1rem;
  max-width: 60ch;
}

.post-grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.post-card {
  display: block;
  border: 1px solid var(--blog-border);
  border-radius: 12px;
  padding: 24px;
  color: inherit;
  background: var(--blog-bg-soft);
}

.post-card:hover {
  border-color: var(--blog-blue);
  text-decoration: none;
}

.post-card h2 {
  margin: 8px 0;
  font-size: 1.25rem;
  color: var(--blog-ink);
}

.post-card p {
  color: var(--blog-muted);
  margin: 0;
}

.post-card-date,
.post-meta {
  font-family: ui-monospace, 'SFMono-Regular', Menlo, monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blog-blue);
  margin: 0 0 8px;
}

.post h1 {
  font-size: 2rem;
  margin: 0 0 28px;
  line-height: 1.2;
}

.post-body h2 {
  font-size: 1.4rem;
  color: var(--blog-ink);
  margin-top: 2.2em;
}

.post-body h3 {
  font-size: 1.1rem;
  color: var(--blog-ink);
  margin-top: 1.6em;
}

.post-body p,
.post-body li {
  font-size: 1.02rem;
}

.post-body blockquote {
  margin: 1.5em 0;
  padding: 0.2em 1.2em;
  border-left: 3px solid var(--blog-blue);
  background: var(--blog-bg-soft);
  color: var(--blog-ink);
}

.post-body code {
  background: var(--blog-bg-soft);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
}

.post-body th,
.post-body td {
  border: 1px solid var(--blog-border);
  padding: 8px 12px;
  text-align: left;
}

.post-body th {
  background: var(--blog-bg-soft);
}

.key-takeaways {
  margin: 28px 0;
  padding: 20px 24px;
  border: 1px solid var(--blog-border);
  border-left: 3px solid var(--blog-blue);
  border-radius: 10px;
  background: var(--blog-bg-soft);
}

.key-takeaways-title {
  margin: 0 0 10px;
  font-family: ui-monospace, 'SFMono-Regular', Menlo, monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blog-blue);
}

.key-takeaways ul {
  margin: 0;
  padding-left: 1.2em;
}

.key-takeaways li {
  margin: 0.35em 0;
}

.post-toc {
  margin: 0 0 32px;
  padding: 16px 20px;
  border: 1px solid var(--blog-border);
  border-radius: 10px;
}

.post-toc-title {
  margin: 0 0 8px;
  font-family: ui-monospace, 'SFMono-Regular', Menlo, monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blog-muted);
}

.post-toc ol {
  margin: 0;
  padding-left: 1.2em;
  font-size: 0.92rem;
}

.post-toc li {
  margin: 0.25em 0;
}

.post-cta {
  margin-top: 3em;
  padding: 20px;
  border-radius: 12px;
  background: var(--blog-bg-soft);
  text-align: center;
}

.post-cta a {
  font-weight: 600;
}

.post-back {
  margin-top: 1.5em;
}

.blog-footer {
  border-top: 1px solid var(--blog-border);
  background: var(--blog-bg-soft);
}

.blog-footer-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--blog-muted);
}

.blog-footer-links {
  display: flex;
  gap: 18px;
}