/* Series navigation */
    .series-nav-block {
      border: 1px solid oklch(0.3 0.05 var(--hue) / 0.4);
      border-radius: 0.75rem;
      overflow: hidden;
      background: oklch(0.12 0.04 var(--hue) / 0.4);
    }
    .series-nav-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.75rem 1rem;
      border-bottom: 1px solid oklch(0.3 0.05 var(--hue) / 0.3);
      flex-wrap: wrap;
    }
    .series-nav-label {
      font-size: 0.65rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.15em;
      color: oklch(0.6 0.15 var(--hue));
      white-space: nowrap;
    }
    .series-nav-title {
      font-size: 0.875rem;
      font-weight: 600;
      color: oklch(0.85 0.06 var(--hue));
      flex: 1;
    }
    .series-nav-progress {
      font-size: 0.7rem;
      color: oklch(0.5 0.05 var(--hue));
      white-space: nowrap;
    }
    .series-chapters {
      display: flex;
      flex-direction: column;
      max-height: 220px;
      overflow-y: auto;
    }
    .series-chapter-link {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      padding: 0.4rem 1rem;
      font-size: 0.82rem;
      color: oklch(0.65 0.06 var(--hue));
      text-decoration: none;
      transition: background 0.15s ease, color 0.15s ease;
      border-bottom: 1px solid oklch(0.25 0.04 var(--hue) / 0.3);
    }
    .series-chapter-link:last-child {
      border-bottom: none;
    }
    .series-chapter-link:hover {
      background: oklch(0.2 0.05 var(--hue) / 0.4);
      color: white;
    }
    .series-chapter-current {
      background: oklch(0.18 0.07 var(--hue) / 0.6);
      color: oklch(0.85 0.12 var(--hue)) !important;
      font-weight: 600;
    }
    .series-chapter-link .chapter-num {
      font-size: 0.65rem;
      font-weight: 700;
      color: oklch(0.6 0.15 var(--hue));
      min-width: 1.4em;
      text-align: center;
      flex-shrink: 0;
    }
    .series-chapter-link .chapter-title {
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
    .series-prev-next {
      display: grid;
      grid-template-columns: 1fr 1fr;
      border-top: 1px solid oklch(0.3 0.05 var(--hue) / 0.3);
    }
    .series-pn-btn {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.6rem 0.875rem;
      font-size: 0.78rem;
      color: oklch(0.6 0.08 var(--hue));
      text-decoration: none;
      transition: background 0.15s ease, color 0.15s ease;
      white-space: nowrap;
      overflow: hidden;
    }
    .series-pn-btn span:not([class]) {
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .series-pn-right {
      justify-content: flex-end;
      text-align: right;
      border-left: 1px solid oklch(0.3 0.05 var(--hue) / 0.3);
    }
    .series-pn-btn:hover:not(.series-pn-disabled) {
      background: oklch(0.2 0.05 var(--hue) / 0.4);
      color: white;
    }
    .series-pn-disabled {
      opacity: 0.35;
      pointer-events: none;
    }
    /* Add scroll margin for hash navigation */
    #post-container {
      scroll-margin-top: calc(var(--navbar-height) + 2rem);
    }
    /* Ensure smooth scrolling */
    html {
      scroll-behavior: smooth;
    }
    @media print {
      .download-pdf-btn {
        display: none !important;
      }
    }