.ds-chapter-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.ds-chapter-list__group-list {
  display: contents;
}

.ds-chapter-list__card {
  background-color: var(--surface-base);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);

  transition: box-shadow var(--duration-fast) var(--ease-out);
}

.ds-chapter-list__card:hover {
  box-shadow: var(--shadow-lg);
}

.ds-chapter-list__head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: linear-gradient(135deg, var(--accent-subtle) 0%, transparent 100%);
  border-bottom: 1px solid var(--border-subtle);

  border-top-left-radius: var(--radius-xl);
  border-top-right-radius: var(--radius-xl);
}

.ds-chapter-list__ring {
  --ds-chapter-ring-pct: 0;
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background:
    conic-gradient(
      var(--accent-primary) calc(var(--ds-chapter-ring-pct) * 1%),
      var(--surface-sunken) 0
    );
  display: flex;
  align-items: center;
  justify-content: center;
}

.ds-chapter-list__ring::after {
  content: attr(data-label);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--surface-base);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.ds-chapter-list__head-content {
  flex: 1;
  min-width: 0;
}

.ds-chapter-list__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.005em;
  line-height: var(--leading-snug);
  color: var(--text-primary);
  display: block;
  width: 100%;
  border: 0;
  background-color: transparent;
  padding: 0;
  outline: none;
}

.ds-chapter-list__name:focus {
  box-shadow: inset 0 -1px 0 var(--accent-primary);
}

.ds-chapter-list__name[readonly] {
  cursor: default;
}

.ds-chapter-list__name[readonly]:focus {
  box-shadow: none;
  outline: none;
}

.ds-chapter-list__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-snug);
  margin-top: var(--space-1);
}

.ds-chapter-list__menu {
  display: flex;
  gap: var(--space-1);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.ds-chapter-list__card:hover .ds-chapter-list__menu,
.ds-chapter-list__card:focus-within .ds-chapter-list__menu {
  opacity: 1;
}

.ds-chapter-list__menu-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background-color: transparent;
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.ds-chapter-list__menu-btn:hover {
  background-color: var(--surface-sunken);
  color: var(--text-primary);
}

.ds-chapter-list__menu-btn:focus-visible {
  outline: 2px solid var(--border-focus, var(--accent-primary));
  outline-offset: 2px;
}

.ds-chapter-list__menu-btn--save {
  display: none;
  color: var(--accent-primary);
}
.ds-chapter-list__menu-btn--save:hover {
  background-color: var(--accent-subtle);
  color: var(--accent-primary);
}

.ds-chapter-list__body {
  padding: var(--space-3) var(--space-5) var(--space-4);
}

.ds-chapter-list__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.ds-chapter-list__item {

  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
  background-color: transparent;
  border: 0;
  text-align: left;
  width: 100%;
}

.ds-chapter-list__item:hover {
  background-color: var(--surface-hover);
}

.ds-chapter-list__item-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.ds-chapter-list__item-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1.5px var(--border-strong);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    box-shadow var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
  position: relative;
}

.ds-chapter-list__item-check::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-on-accent);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.ds-chapter-list__item--on .ds-chapter-list__item-check,
.ds-chapter-list__item:has(.ds-chapter-list__item-input:checked) .ds-chapter-list__item-check {
  background-color: var(--accent-primary);
  box-shadow: inset 0 0 0 1.5px var(--accent-primary);
}

.ds-chapter-list__item--on .ds-chapter-list__item-check::after,
.ds-chapter-list__item:has(.ds-chapter-list__item-input:checked) .ds-chapter-list__item-check::after {
  opacity: 1;
}

.ds-chapter-list__item:has(.ds-chapter-list__item-input:focus-visible) .ds-chapter-list__item-check {
  outline: 2px solid var(--border-focus, var(--accent-primary));
  outline-offset: 2px;
}

.ds-chapter-list__item-name {
  flex: 1;
  min-width: 0;
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--text-primary);
  line-height: var(--leading-snug);
  background-color: transparent;
  border: 0;
  padding: 0;
  outline: none;
  width: 100%;
}

.ds-chapter-list__item-name:focus {
  box-shadow: inset 0 -1px 0 var(--accent-primary);
}

.ds-chapter-list__item--on .ds-chapter-list__item-name,
.ds-chapter-list__item:has(.ds-chapter-list__item-input:checked) .ds-chapter-list__item-name {
  text-decoration: line-through;
  text-decoration-color: var(--text-disabled);
  color: var(--text-tertiary);
}

.ds-chapter-list__item-meta {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.ds-chapter-list__item-actions {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  background-color: transparent;
  border: 0;
  cursor: pointer;
  color: var(--text-tertiary);
  opacity: 0;
  transition:
    opacity var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.ds-chapter-list__item:hover .ds-chapter-list__item-actions,
.ds-chapter-list__item:focus-within .ds-chapter-list__item-actions {
  opacity: 1;
}

.ds-chapter-list__item-actions:hover {
  background-color: var(--surface-sunken);
  color: var(--text-primary);
}

.ds-chapter-list__card-add {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-2);
  background-color: transparent;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-family: inherit;
  font-size: var(--text-sm);
  cursor: pointer;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  align-self: flex-start;
}

.ds-chapter-list__card-add:hover {
  border-color: var(--accent-muted);
  color: var(--accent-primary);
}

.ds-chapter-list__add {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: center;
  padding: var(--space-3) var(--space-4);
  background-color: var(--surface-base);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  cursor: pointer;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  align-self: stretch;
}

.ds-chapter-list__add:hover {
  border-color: var(--accent-muted);
  color: var(--accent-primary);
}

.ds-chapter-list__item-count {
  flex-shrink: 0;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  padding: var(--space-0-5) var(--space-2);
  border-radius: var(--radius-full);
  background-color: var(--surface-sunken);
}

.ds-chapter-list--readonly .ds-chapter-list__card:hover {
  box-shadow: var(--shadow-md);
}

.ds-chapter-list--readonly .ds-chapter-list__menu {
  display: none;
}

.ds-chapter-list--readonly .ds-chapter-list__item {
  cursor: default;
}

.ds-chapter-list--readonly .ds-chapter-list__item:hover {
  background-color: transparent;
}

.ds-chapter-list__card[data-group-state="new"] .ds-chapter-list__menu-btn--save,
.ds-chapter-list__card[data-group-state="edit"] .ds-chapter-list__menu-btn--save {
  display: inline-flex;
}