/* ── Blog Layout ── */
.blog-layout { display: flex; gap: 0; }
.blog-main { flex: 1; min-width: 0; padding: 48px 32px 64px; }

/* ── Blog Sidebar Tree Nav ── */
.blog-sidebar {
  width: 260px; flex-shrink: 0; padding: 32px 0 32px 0;
  border-right: 1px solid var(--border);
  position: sticky; top: 0; max-height: 100vh; overflow-y: auto;
}
.blog-sidebar .sidebar-inner { padding: 0 20px; }

.blog-sidebar .blog-home-link {
  display: block; padding: 0 0 12px 0; margin-bottom: 16px;
  font-family: var(--ff-body); font-size: var(--fs-body); font-weight: 600;
  color: var(--cobalt); text-decoration: none; border-left: none;
  border-bottom: 1px solid var(--border);
}
.blog-sidebar .blog-home-link:hover { color: var(--emerald); }

.blog-sidebar .cat-label {
  font-family: var(--ff-display); font-size: 15px; letter-spacing: 0.08em;
  color: var(--text); margin: 24px 0 6px; padding: 0;
}

.blog-sidebar ul { list-style: none; margin: 0; padding: 0; }
.blog-sidebar li { margin: 0; }

.blog-sidebar a {
  display: block; padding: 5px 0 5px 14px; font-family: var(--ff-body); font-size: var(--fs-pagenav);
  font-weight: 500; color: var(--muted); text-decoration: none;
  border-left: 2px solid transparent; transition: all 0.15s; line-height: 1.5;
}
.blog-sidebar a:hover { color: var(--text); }
.blog-sidebar a.active { color: var(--emerald); border-left-color: var(--emerald); font-weight: 600; }

/* Expandable parent items */
.blog-sidebar .parent-link {
  display: flex; align-items: center; justify-content: space-between;
  padding-right: 4px; cursor: pointer;
}
.blog-sidebar .parent-link .chevron {
  font-size: 10px; color: var(--muted); transition: transform 0.2s;
}
.blog-sidebar .parent-link.expanded .chevron { transform: rotate(90deg); }

/* Sub-items */
.blog-sidebar .sub-items { display: none; }
.blog-sidebar .sub-items.open { display: block; }
.blog-sidebar .sub-items a { padding-left: 28px; font-size: 13px; }

/* Nested sub-items (3rd level) */
.blog-sidebar .sub-items .sub-items a { padding-left: 42px; font-size: 12px; }

@media (max-width: 960px) {
  .blog-sidebar { display: none; }
  .blog-layout { display: block; }
  .blog-main { padding: 32px 20px 48px; }
}

/* ── Content Typography: inherited from tokens.css (.blog-main selectors) ── */

/* ── Code Blocks ── */
pre {
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 20px; overflow-x: auto; margin: 12px 0 18px;
  font-family: var(--ff-mono); font-size: 14px; color: var(--text); line-height: 1.5;
}
code {
  font-family: var(--ff-mono); font-size: 14px; background: var(--surface);
  padding: 2px 6px; border-radius: 4px; color: var(--emerald);
}
pre code { background: none; padding: 0; color: var(--text); }

/* ── Callout Boxes ── */
.callout {
  padding: 14px 18px; margin: 14px 0; font-size: var(--fs-body); color: var(--muted); line-height: 1.6;
}
.callout.warning { border-left-color: #F59E0B; }
.callout.info { border-left-color: var(--cobalt); }
.callout strong { color: var(--text); }
.callout-label {
  font-family: var(--ff-mono); font-size: var(--fs-tag); font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px;
}
.callout.warning .callout-label { color: #F59E0B; }
.callout.info .callout-label { color: var(--cobalt); }

/* ── Numbered Steps ── */
.steps { counter-reset: step-counter; }
.step {
  counter-increment: step-counter;
  padding-left: 40px; position: relative; margin-bottom: 24px;
}
.step::before {
  content: counter(step-counter);
  position: absolute; left: 0; top: 0;
  width: 28px; height: 28px; border-radius: 50%; background: var(--cobalt); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--ff-mono); font-size: 14px; font-weight: 500;
}

/* ── Link Cards (extends shared .link-card from tokens.css) ── */
.link-card { margin: 10px 0; }

/* ── Section Separator ── */
.ref-sep {
  border: none; border-top: 2px solid var(--border); margin: 48px 0;
}

/* ── Category Cards (index page) ── */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 24px; }
.cat-card { /* extends .card */ }
.cat-card h3 {
  font-family: var(--ff-display); font-size: var(--fs-h3-content); letter-spacing: 0.04em;
  color: var(--text); margin-bottom: 8px;
}
.cat-card p { margin-bottom: 0; font-size: var(--fs-body); color: var(--muted); line-height: 1.65; }
.cat-card .count {
  font-family: var(--ff-mono); font-size: var(--fs-tag); color: var(--cobalt);
  margin-top: 12px;
}

/* ── Coming Soon ── */
.coming-soon { text-align: center; margin-top: 24px; padding: 32px; }
.coming-soon h3 {
  font-family: var(--ff-display); font-size: var(--fs-h3-content); letter-spacing: 0.04em;
  color: var(--text); margin-bottom: 8px;
}

/* Mobile typography: inherited from tokens.css */