/* ============================================================
   blog-detail.css — Immersive reading overlay
   ============================================================ */
.blog-overlay {
  position: fixed; inset: 0; z-index: 2000;
  opacity: 0; visibility: hidden; transition: opacity 0.4s var(--ease), visibility 0.4s;
}
.blog-overlay.open { opacity: 1; visibility: visible; }
.blog-overlay-bg {
  position: absolute; inset: 0;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.blog-reader {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: min(720px, 100vw); background: var(--bg);
  border-left: 1px solid rgba(var(--accent-rgb), 0.15);
  box-shadow: -20px 0 80px rgba(0,0,0,0.4);
  overflow-y: auto; overflow-x: hidden;
  transform: translateX(40px); transition: transform 0.4s var(--ease);
}
.blog-overlay.open .blog-reader { transform: none; }

/* Progress bar at top */
.blog-progress {
  position: sticky; top: 0; left: 0; right: 0; height: 3px; z-index: 10;
  background: rgba(var(--accent-rgb), 0.1);
}
.blog-progress-fill {
  height: 100%; width: 0%; background: var(--accent);
  box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.6);
  transition: width 0.1s linear;
}

/* Header */
.blog-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px clamp(24px, 5vw, 48px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 3px; z-index: 5;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.blog-back {
  display: flex; align-items: center; gap: 8px; cursor: none;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--fg-muted); background: none; border: none;
  transition: color 0.2s;
}
.blog-back:hover { color: var(--accent); }
.blog-back svg { width: 18px; height: 18px; }

.blog-header-meta { display: flex; align-items: center; gap: 12px; }
.blog-date {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  letter-spacing: 0.08em; color: var(--fg-subtle);
}
.blog-tags { display: flex; gap: 6px; }
.blog-tag {
  font-family: var(--font-mono); font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--accent); background: rgba(var(--accent-rgb), 0.1);
  padding: 3px 8px; border-radius: 99px;
}

/* Body */
.blog-body {
  padding: clamp(32px, 6vw, 64px) clamp(24px, 5vw, 48px);
  padding-bottom: 120px;
}
.blog-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem); line-height: 1.1;
  margin-bottom: 32px; color: var(--fg);
}
.blog-content {
  font-size: 1.05rem; line-height: 1.8; color: var(--fg-muted);
}
.blog-content h3 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.4rem; line-height: 1.2; color: var(--fg);
  margin: 36px 0 16px;
}
.blog-content p { margin-bottom: 18px; }
.blog-content strong { color: var(--fg); font-weight: 600; }
.blog-content code {
  font-family: var(--font-mono); font-size: 0.9em;
  background: rgba(var(--accent-rgb), 0.08);
  padding: 2px 6px; border-radius: 4px; color: var(--accent);
}

/* Related posts */
.blog-related { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.blog-related h3 {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-subtle);
  margin-bottom: 16px;
}
.blog-related-cards { display: flex; flex-direction: column; gap: 10px; }
.blog-related-card {
  display: flex; align-items: center; gap: 14px; text-align: left;
  padding: 16px 18px; border-radius: 14px; cursor: none;
  border: 1px solid var(--border); background: transparent;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.blog-related-card:hover {
  background: rgba(var(--accent-rgb), 0.06);
  border-color: rgba(var(--accent-rgb), 0.3);
  box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.1);
}
.brc-date {
  font-family: var(--font-mono); font-size: 10px; font-weight: 700;
  letter-spacing: 0.08em; color: var(--fg-subtle); white-space: nowrap;
}
.brc-title {
  flex: 1; font-family: var(--font-display); font-size: 1.05rem;
  font-weight: 600; color: var(--fg); line-height: 1.2;
}
.brc-arrow {
  color: var(--accent); font-size: 1.2rem; opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
}
.blog-related-card:hover .brc-arrow { opacity: 1; transform: translateX(4px); }

/* Mobile */
@media (max-width: 860px) {
  .blog-reader { width: 100vw; }
  .blog-header-meta { display: none; }
}

/* ── Light mode ── */
[data-theme="light"] .blog-reader {
  box-shadow: -20px 0 80px rgba(0,0,0,0.12);
}
[data-theme="light"] .blog-overlay-bg {
  background: color-mix(in srgb, var(--bg) 60%, transparent);
}