/* ===== Retention Kit: reading progress / toc / cta / related / back-to-top ===== */
#reading-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--accent, var(--gold, #B8860B)), var(--accent-light, var(--gold-light, #D4A537)));
  z-index: 9999; border-radius: 0 2px 2px 0;
  box-shadow: 0 0 6px rgba(200, 80, 62, 0.35);
  transition: width .1s linear;
}
#toc-card {
  margin: 40px auto 8px;
  padding: 22px 26px;
  background: var(--panel, var(--card-bg, #FAF7F0));
  border: 1px solid var(--line, var(--border, #E0D9CC));
  border-left: 4px solid var(--accent, var(--gold, #B8860B));
  border-radius: 12px;
  max-width: 860px;
}
#toc-card .toc-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  margin-bottom: 14px;
}
#toc-card .toc-heading {
  font-family: var(--serif); font-size: 17px; font-weight: 700;
  color: var(--ink, var(--text, #2D2517));
  letter-spacing: .02em;
}
#toc-card .toc-heading .toc-badge {
  display: inline-block; vertical-align: 2px; margin-left: 8px;
  font-family: var(--sans); font-size: 12px; font-weight: 500;
  color: var(--accent-dark, #946D0B);
  background: var(--highlight, var(--quote-bg, #EDE8DB));
  border-radius: 999px; padding: 2px 10px;
  letter-spacing: .05em;
}
#toc-card .toc-readtime { font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint, var(--muted, #8B7E6A)); }
#toc-list { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
#toc-card { box-shadow: 0 1px 8px rgba(45, 37, 23, 0.06); }
.toc-item {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 13px; border-radius: 999px;
  font-family: var(--sans); font-size: 13px;
  color: var(--ink-dim, #3d3d3d);
  background: var(--bg, var(--bg-alt, #F5F1E8));
  border: 1px solid var(--border-light, var(--border-warm, #E0D9CC));
  text-decoration: none !important; border-bottom: none;
  transition: all .25s ease;
}
.toc-item .toc-no {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent, var(--gold, #B8860B)); color: #fff;
  font-size: 11px; font-weight: 700; flex-shrink: 0;
}
.toc-item:hover { border-color: var(--accent, var(--gold, #B8860B)); color: var(--accent-dark, #946D0B); transform: translateY(-1px); }
.toc-item.active { background: var(--accent, var(--gold, #B8860B)); border-color: var(--accent, var(--gold, #B8860B)); color: #fff; }
.toc-item.active .toc-no { background: #fff; color: var(--accent-dark, #946D0B); }

#next-step {
  margin: 48px auto 8px; max-width: 860px;
  background: var(--panel, var(--card-bg, #FAF7F0));
  border: 1px solid var(--line, var(--border, #E0D9CC));
  border-radius: 16px;
  padding: 30px 30px 26px;
  box-shadow: 0 2px 16px rgba(45, 37, 23, 0.06);
}
#next-step .done-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans); font-size: 12.5px; letter-spacing: .18em;
  color: var(--accent-dark, #946D0B); margin-bottom: 10px;
}
#next-step .done-badge::before {
  content: ""; width: 26px; height: 1px; background: var(--accent, var(--gold, #B8860B));
}
#next-step .ns-title {
  font-family: var(--serif); font-size: 22px; font-weight: 800;
  color: var(--ink, var(--text, #2D2517)); letter-spacing: .01em;
}
#next-step .ns-sub { font-family: var(--sans); font-size: 14px; color: var(--ink-faint, var(--muted, #8B7E6A)); margin: 8px 0 20px; }
#next-step .ns-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.ns-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 20px; border-radius: 999px;
  font-family: var(--sans); font-size: 14px; font-weight: 600;
  background: var(--accent, var(--gold, #B8860B)); color: #fff;
  text-decoration: none !important; border: 1px solid var(--accent, var(--gold, #B8860B));
  transition: all .25s ease; cursor: pointer;
}
.ns-btn:hover { filter: brightness(1.12); transform: translateY(-1px); box-shadow: 0 3px 10px rgba(184,134,11,.25); color:#fff; }
.ns-btn.ghost { background: transparent; color: var(--accent-dark, #946D0B); }
.ns-btn.ghost:hover { background: var(--highlight, var(--quote-bg, #EDE8DB)); color: var(--accent-dark, #946D0B); box-shadow: none; }
#related-section { margin-top: 32px; border-top: 1px dashed var(--border, #E0D9CC); padding-top: 20px; }
#related-section .rel-head { font-family: var(--serif); font-size: 15px; font-weight: 700; color: var(--ink, var(--text, #2D2517)); margin-bottom: 14px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.related-card {
  display: flex; flex-direction: column; gap: 3px;
  padding: 14px 16px; border-radius: 12px;
  background: var(--bg, var(--bg-alt, #F5F1E8));
  border: 1px solid var(--border-light, var(--border-warm, #E0D9CC));
  text-decoration: none !important; border-bottom: none;
  transition: all .25s ease;
}
.related-card:hover { border-color: var(--accent, var(--gold, #B8860B)); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(45,37,23,.08); }
.related-card .rc-cat { font-family: var(--sans); font-size: 11px; letter-spacing: .1em; color: var(--accent-dark, #946D0B); }
.related-card .rc-title { font-family: var(--serif); font-size: 15.5px; font-weight: 700; color: var(--ink, var(--text, #2D2517)); }
.related-card .rc-author { font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint, var(--muted, #8B7E6A)); }
.related-card .rc-go { font-family: var(--sans); font-size: 12px; color: var(--accent, var(--gold, #B8860B)); margin-top: 4px; }
#back-to-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 9998;
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--panel, #fff); color: var(--accent, var(--gold, #B8860B));
  border: 1px solid var(--accent, var(--gold, #B8860B));
  box-shadow: 0 4px 14px rgba(45,37,23,.15);
  cursor: pointer; opacity: 0; pointer-events: none;
  transform: translateY(8px); transition: all .3s ease;
}
#back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
#back-to-top:hover { background: var(--accent, var(--gold, #B8860B)); color: #fff; }
@media (max-width: 600px) {
  #toc-card { padding: 16px 18px; margin-top: 24px; }
  #next-step { padding: 24px 20px 20px; }
  #back-to-top { right: 16px; bottom: 18px; width: 40px; height: 40px; }
}
@media (prefers-reduced-motion: reduce) {
  #reading-progress { transition: none; }
}