writebook/app/assets/stylesheets/toc.css

.toc {
  --hover-size: 0;

  display: grid;
  inline-size: auto;
  gap: var(--block-space) var(--inline-space);
  grid-template-columns: repeat(auto-fit, minmax(max(130px, 12cqi), 1fr));
  letter-spacing: -0.01ch;
  list-style: none;
  outline-offset: var(--inline-space-half);
  padding: 0;

  &:has(turbo-frame > :last-child:nth-child(-n + 2)) {
    @media (min-width: 70ch) {
      grid-template-columns: repeat(auto-fit, minmax(max(130px, 12cqi), 24cqi));
    }
  }

  &:focus:not(:focus-visible) {
    outline: none;
  }

  .toc__container:where(:has(#toc-list:checked)) & {
    display: flex;
    flex-direction: column;
    row-gap: calc(var(--block-space) * 0.3);
  }
}

.toc__blank-slate {
  display: inline-flex;
  flex-direction: column;
  margin-inline: auto;

  img {
    inline-size: 6.5em;
  }

  :has(.toc__leaf) & {
    display: none;
  }
}

.toc__bookmark {
  --icon-size: 1.4em;

  display: none;

  .toc__leaf--last-read & {
    display: inline-flex;
  }

  .toc__container:where(:has(#toc-grid:checked)) & {
    inset: calc(var(--icon-size) * -0.33) 0 auto calc(var(--icon-size) * -0.5);
    position: absolute;
  }

  svg {
    block-size: var(--icon-size);
    flex-shrink: 0;
    inline-size: var(--icon-size);
  }
}

.toc__container {
  max-inline-size: 70ch;

  &:where(:has(#delete-mode:checked)) {
    .disable-when-deleting {
      cursor: not-allowed;
      filter: grayscale(100%) contrast(0.5);
      opacity: 0.5;
      pointer-events: none;
    }
  }
}

.toc__leaf {
  border: solid 2px transparent;
  color: var(--color-ink);
  container-type: inline-size;
  display: inline-flex;
  flex-direction: column;
  margin: 0;
  scroll-margin-top: 8em;
  text-align: center;

  .toc__container:where(:has(#toc-list:checked)) & {
    align-items: center;
    column-gap: 1ch;
    flex-direction: row;
    justify-content: center;
    row-gap: calc(var(--block-space) * 0.3);
    text-align: start;
  }
}

.toc__title {
  --title-border-color: var(--color-subtle-dark);

  color: inherit;
  display: flex;
  flex-direction: column;
  font-size: var(--font-medium-responsive);
  gap: var(--inline-space);
  line-height: 1.2;
  text-decoration: none;

  .toc__container:where(:has(#toc-grid:checked)) & {
    font-weight: 700;
  }

  .toc__container:where(:has(#toc-list:checked)) & {
    flex-direction: row;
    flex-grow: 1;
    font-size: inherit;
    white-space: nowrap;

    &:is(a) {
      @media (hover: hover) {
        &:hover {
          text-decoration-line: underline;
          text-decoration-thickness: 0.075em;
        }
      }
    }

    :is(.input) {
      field-sizing: content;
      min-inline-size: 20ch;
    }

    &::after {
      border-block-end: 1px dotted var(--title-border-color);
      content: "";
      flex-grow: 1;
      margin-block-end: 0.25em;
    }

    .toc__leaf--section & {
      font-weight: 750;
    }
  }

  .toc__leaf--last-read & {
    --title-border-color: var(--color-marker);
  }
}

.toc__thumbnail {
  aspect-ratio: 6 / 9;
  border-radius: 0.3em;
  border: 1px solid var(--color-subtle-dark);
  color: inherit;
  display: block;
  font-size: clamp(0.5rem, 5cqi, 0.8rem);
  line-height: 1.4;
  margin-block-end: var(--block-space-half);
  overflow: hidden;
  padding: 10cqi;
  position: relative;
  text-align: start;
  text-decoration: none;

  .toc__link {
    background-color: transparent;
    content: "";
    inset: 0;
    position: absolute;
    z-index: 1;

    .toc__container:where(:has(#delete-mode:checked)) & {
      pointer-events: none;
    }
  }

  .toc__leaf--section & {
    align-items: center;
    display: flex;
    font-size: var(--font-medium-responsive);
    font-weight: 900;
    justify-content: center;
  }

  .toc__leaf--picture & {
    padding: 0;

    img {
      block-size: 100%;
      inline-size: 100%;
      object-fit: cover;
    }
  }

  .toc__container:where(:has(#toc-list:checked)) & {
    display: none;
  }

  .heading__link {
    display: none;
  }

  &.toc__thumbnail--dark {
    background-color: var(--color-ink);
    color: var(--color-ink-reversed);
  }
}

.toc__wordcount {
  white-space: nowrap;

  .toc__container:where(:has(#toc-list:checked)) & {
    font-size: 0.8em;
  }
}

/* Delete mode */
.leaf__delete {
  --hover-color: var(--color-negative);
  --hover-size: max(2px, 0.08em);

  display: none;

  #footer &,
  .toc__container:where(:has(#delete-mode:checked)) & {
    display: flex;

    :is(.delete-mode__button:has(input:checked)) {
      --btn-background: var(--color-negative);
    }
  }

  .toc__container:where(:has(#toc-grid:checked)) & .btn {
    margin-block-end: calc(-0.5 * var(--btn-size));
    margin-inline: auto;
    position: relative;
    z-index: 1;
  }
}

.delete-mode__button:has(input:checked) {
  --btn-background: var(--color-negative);
}

.arrange-mode__button:has(input:checked)  {
  --btn-background: var(--color-link);
}

body:not(:has(.toc__leaf)) {
  .disable-when-empty {
    cursor: not-allowed;
    filter: grayscale(100%) contrast(0.5);
    opacity: 0.5;
    pointer-events: none;
  }
}