/* ===================================
   TABLE OF CONTENTS
   =================================== */
.toc {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--brand-accent);
  border-radius: 10px;
  padding: 0;
  margin: 24px 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

/* Header row */
.toc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-gray);
  border-bottom: 1px solid var(--border-color);
  cursor: default;
}

.toc-icon {
  color: var(--brand-accent);
  flex-shrink: 0;
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
  letter-spacing: 0.01em;
}

.toc-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  cursor: pointer;
  color: var(--text-secondary);
  flex-shrink: 0;
  padding: 0;
}

.toc-toggle:hover {
  background: var(--bg-white);
  color: var(--brand-accent);
}

.toc-chevron {
  transition: transform 0.25s ease;
  display: block;
}

/* List */
.toc-list {
  list-style: none;
  margin: 0 !important;
  padding: 0 !important;
  overflow: hidden;
  transition:
    max-height 0.3s ease,
    opacity 0.25s ease,
    padding 0.3s ease;
  max-height: 2000px;
  opacity: 1;
}

.toc-list.toc-collapsed {
  max-height: 0;
  opacity: 0;
  padding: 0;
}

.toc-item {
  margin: 0;
}

.toc-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition:
    color 0.15s,
    background 0.15s,
    border-color 0.15s;
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--brand-accent);
  background: var(--bg-gray);
  border-left-color: var(--brand-accent);
}

.toc-link.toc-active {
  color: var(--brand-accent);
  background: rgba(44, 95, 141, 0.06);
  border-left-color: var(--brand-accent);
  font-weight: 600;
}

/* Number badge */
.toc-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  background: var(--bg-gray);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition:
    background 0.15s,
    color 0.15s,
    border-color 0.15s;
  line-height: 1;
}

.toc-link:hover .toc-num,
.toc-link.toc-active .toc-num {
  background: var(--brand-accent);
  color: var(--text-white);
  border-color: var(--brand-accent);
}

.toc-label {
  flex: 1;
}

/* Responsive */
@media (max-width: 640px) {
  .toc {
    margin: 16px 0;
  }

  .toc-link {
    padding: 6px 12px;
    font-size: 13px;
  }

  .toc-header {
    padding: 10px 12px;
  }
}