:root {
  --bg: #f4f4f2;
  --surface: #ffffff;
  --ink: #121210;
  --ink-soft: #7a7a74;
  --line: #ececE8;
  --red: #e2402b;
  --red-dark: #c22f1d;
  --mono: 'JetBrains Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.blog-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.blog-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.blog-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
}
.blog-logo .logo-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  flex-shrink: 0;
}
.blog-nav {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 0.92rem;
}
.blog-nav a { text-decoration: none; color: var(--ink-soft); }
.blog-nav a:hover { color: var(--ink); }
.blog-nav .cta {
  background: var(--red);
  color: #fff;
  padding: 9px 18px;
  border-radius: 6px;
  font-weight: 600;
}
.blog-nav .cta:hover { background: var(--red-dark); }

/* Hero (index) */
.blog-hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--red);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.blog-hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
.blog-hero p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 60ch;
  margin: 0;
}

/* Article cards grid */
.grid {
  display: grid;
  gap: 20px;
  padding: 40px 0 72px;
}
.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover {
  border-color: var(--red);
  transform: translateY(-2px);
}
.code-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--red);
  border: 1px solid var(--red);
  border-radius: 4px;
  padding: 3px 8px;
  margin-bottom: 14px;
  letter-spacing: 0.03em;
}
.card h2 {
  font-size: 1.25rem;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.card p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0 0 12px;
}
.card .meta {
  font-size: 0.8rem;
  color: #8a8d94;
  font-family: var(--mono);
}

/* Article page */
.article-head {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--line);
}
.breadcrumb {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--ink-soft); text-decoration: underline; }
.article-head h1 {
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.article-meta {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.article-body {
  padding: 40px 0 24px;
  font-size: 1.05rem;
}
.article-body h2 {
  font-size: 1.35rem;
  margin: 40px 0 14px;
  letter-spacing: -0.01em;
}
.article-body p { margin: 0 0 18px; color: #26282c; }
.article-body ul { margin: 0 0 18px; padding-left: 22px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--ink); }

/* CTA box */
.cta-box {
  margin: 48px 0;
  padding: 32px;
  background: var(--ink);
  color: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-box .txt h3 { margin: 0 0 6px; font-size: 1.15rem; }
.cta-box .txt p { margin: 0; color: #c9cad0; font-size: 0.92rem; }
.cta-box a {
  background: var(--red);
  color: #fff;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 6px;
  font-weight: 600;
  white-space: nowrap;
}
.cta-box a:hover { background: var(--red-dark); }

/* Footer */
.blog-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.blog-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.blog-footer a { color: var(--ink-soft); text-decoration: underline; }

@media (max-width: 600px) {
  .blog-nav { gap: 14px; }
  .blog-nav span.hide-mobile { display: none; }
  .cta-box { flex-direction: column; align-items: flex-start; }
}