.blog-nav {
  position: fixed;
  top: 20px;
  left: calc(50% - 500px);
  width: 130px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  z-index: 100;
}

.blog-nav a {
  text-decoration: none;
  color: #555;
  opacity: 0.55;
  line-height: 1.4;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: opacity 0.15s;
}

.blog-nav a:hover {
  opacity: 1;
  text-decoration: none;
}

.blog-nav a.active {
  opacity: 1;
  color: #222;
  font-weight: 600;
}

@media (max-width: 1060px) {
  .blog-nav { display: none; }
}

.rainbow-text {
  margin-top: 20px;
  display: inline-block;
}

.post-date {
  font-size: 11px;
  color: #aaa;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-top: 20px;
  margin-bottom: 8px;
}

.post-title {
  font-size: 17px;
  font-weight: 600;
  color: #1a1a1a;
  line-height: 1.4;
  margin: 0 0 12px 0;
  padding: 0;
  font-family: 'IBM Plex Sans', sans-serif;
}

p {
  font-size: 15px;
  line-height: 1.8;
  color: #333;
  margin-bottom: 1em;
  margin-top: 0;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 300;
}

pre {
  position: relative;
  background: #1e1e2e;
  border-radius: 6px;
  padding: 16px;
  margin: 18px 0;
  overflow-x: auto;
  border: none;
}

pre code {
  font-size: 13px;
  color: #cdd6f4;
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  line-height: 1.55;
  background: none;
  padding: 0;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 11px;
  padding: 3px 9px;
  background: rgba(255,255,255,0.08);
  color: #888;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 3px;
  cursor: pointer;
  font-family: 'IBM Plex Sans', sans-serif;
  transition: background 0.15s, color 0.15s;
}

.copy-btn:hover {
  background: rgba(255,255,255,0.18);
  color: #ddd;
}