/*
 * Chapter-scoped reading treatment for the PySide6 tutorial.
 *
 * Every rule is nested under an explicit body + chapter scope. Nothing in
 * this file can affect the workbench, OpenCV tutorial, or an unlisted page.
 */

/*
 * The chapter menu is available at every viewport width. On phones the
 * existing off-canvas treatment hides it automatically; on wider screens the
 * same button collapses the fixed sidebar and gives the reading area the room
 * back. The desktop preference is restored when the reader changes chapters.
 */
body.tutorial-reading-page .menu-toggle {
  display: inline-flex;
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  border-radius: 8px;
  font-size: 25px;
  line-height: 1;
  transition: background 0.2s ease, transform 0.2s ease;
}

body.tutorial-reading-page .menu-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

body.tutorial-reading-page .menu-toggle:active {
  transform: scale(0.94);
}

body.tutorial-reading-page .menu-toggle:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

body.tutorial-reading-page .sidebar,
body.tutorial-reading-page .main-content,
body.tutorial-reading-page .footer {
  transition: transform 0.28s ease, margin-left 0.28s ease;
}

@media (min-width: 769px) {
  body.tutorial-reading-page.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
  }

  body.tutorial-reading-page.sidebar-collapsed .main-content,
  body.tutorial-reading-page.sidebar-collapsed .footer {
    margin-left: 0;
  }
}

body.tutorial-reading-page:is(
  .chapter-01, .chapter-02, .chapter-03, .chapter-04, .chapter-05,
  .chapter-06, .chapter-07, .chapter-08, .chapter-09, .chapter-10,
  .chapter-11, .chapter-12, .chapter-13, .chapter-14, .chapter-15,
  .chapter-16, .chapter-17, .chapter-18, .chapter-19
) {
  & .main-content {
    max-width: 920px;
    padding-right: 44px;
    padding-left: 44px;
  }

  /*
   * Narrative paragraphs use a traditional two-em first-line indent and a
   * small inset from the article edge. Structural lead-ins are reset below.
   */
  & .content-text {
    width: calc(100% - 1rem);
    margin: 0 0.5rem 0.95rem;
    color: #303843;
    font-size: 16px;
    line-height: 1.9;
    letter-spacing: 0.006em;
    text-align: left;
    text-indent: 2em;
    overflow-wrap: break-word;
  }

  & .content-text + .content-text {
    margin-top: 0.1rem;
  }

  &.chapter-18 .content-text.list-detail {
    width: auto;
    margin-right: 0;
    margin-left: 0;
    text-indent: 0;
  }

  & .content-list {
    width: calc(100% - 1rem);
    margin: 0.35rem 0.5rem 1rem;
    padding-left: 1.75rem;
    color: #303843;
    font-size: 16px;
  }

  & .content-list li {
    margin-bottom: 0.38rem;
    padding-left: 0.12rem;
    line-height: 1.8;
  }

  & .chapter-intro .content-list {
    width: auto;
    margin-right: 0;
    margin-left: 0;
  }

  /* Adjacent one-item lists in the PDF-derived chapters read as one list. */
  & .content-list + .content-list {
    margin-top: -0.72rem;
  }

  & .content-text + .content-list {
    margin-top: -0.28rem;
  }

  & .content-list + .content-text {
    margin-top: 0.15rem;
  }

  & .code-block {
    position: relative;
    margin: 0.8rem 0 1.25rem;
    border: 1px solid #d9e0e5;
    border-left: 4px solid #6e9b76;
    border-radius: 6px;
    background: #f7f9fa;
    box-shadow: 0 1px 2px rgba(31, 41, 55, 0.05);
    padding: 2.55rem 1.15rem 1rem;
    color: #1f2933;
    font-family: "Cascadia Mono", "Consolas", "Source Code Pro", "Fira Code",
      "Microsoft YaHei UI", "Microsoft YaHei", monospace;
    font-size: 13.5px;
    line-height: 1.7;
    white-space: pre;
    overflow-x: auto;
    overflow-y: hidden;
    overflow-wrap: normal;
    word-break: normal;
    tab-size: 4;
  }

  & .code-block::before {
    content: "代码";
    position: absolute;
    top: 0.68rem;
    left: 1rem;
    color: #6b7785;
    font: 600 12px/1.2 "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
    letter-spacing: 0.08em;
  }

  /*
   * Console and program output is marked explicitly in each affected chapter.
   * The label comes from the HTML so file contents and console output can be
   * named accurately without guessing from the displayed text.
   */
  &.chapter-03 .code-block.output-block::before,
  &.chapter-04 .code-block.output-block::before,
  &.chapter-08 .code-block.output-block::before,
  &.chapter-15 .code-block.output-block::before,
  &.chapter-18 .code-block.output-block::before,
  &.chapter-19 .code-block.output-block::before {
    content: attr(data-block-label);
    letter-spacing: 0.04em;
  }

  /* Chapters 3–7 use <pre class="code-block"><code>…</code></pre>. */
  & .code-block > code {
    display: block;
    max-width: none;
    margin: 0;
    padding: 0;
    border-radius: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    line-height: inherit;
    white-space: inherit;
    overflow-wrap: inherit;
    word-break: inherit;
  }

  & .code-copy-button {
    border-color: #ccd6ce;
    background: #fff;
    color: #49604d;
  }

  & .code-copy-button:hover {
    border-color: #9db4a1;
    background: #edf5ee;
    color: #294c30;
  }

  & .code-block::selection,
  & .code-block *::selection {
    background: #cfe6d3;
    color: #142018;
  }

  /* Chapter 8 contains a long method signature in prose. */
  &.chapter-08 .content-text {
    overflow-wrap: anywhere;
  }

  /* The wrapper keeps chapter 13 tables semantic and scrollable on phones. */
  &.chapter-13 .table-scroll {
    max-width: 100%;
    margin: 0.75rem 0 1.25rem;
  }

  &.chapter-13 .table-scroll > .content-table {
    margin: 0;
  }
}

@media (max-width: 768px) {
  body.tutorial-reading-page .menu-toggle {
    margin-right: 0;
  }

  body.tutorial-reading-page.sidebar-overlay-open {
    overflow: hidden;
  }

  body.tutorial-reading-page:is(
    .chapter-01, .chapter-02, .chapter-03, .chapter-04, .chapter-05,
    .chapter-06, .chapter-07, .chapter-08, .chapter-09, .chapter-10,
    .chapter-11, .chapter-12, .chapter-13, .chapter-14, .chapter-15,
    .chapter-16, .chapter-17, .chapter-18, .chapter-19
  ) {
    & .main-content {
      padding: 22px 17px 40px;
    }

    & .content-text,
    & .content-list {
      font-size: 15.5px;
    }

    & .content-text {
      line-height: 1.85;
    }

    & .content-list {
      padding-left: 1.55rem;
    }

    & .code-block {
      max-width: 100%;
      padding: 2.45rem 0.85rem 0.9rem;
      font-size: 12.5px;
      line-height: 1.65;
      white-space: pre;
      overflow-x: auto;
      overflow-wrap: normal;
      word-break: normal;
      -webkit-overflow-scrolling: touch;
    }

    & .code-block > code {
      max-width: none;
      overflow-wrap: normal;
      word-break: normal;
    }

    &.chapter-13 .table-scroll {
      display: block;
      width: 100%;
      max-width: 100%;
      overflow-x: auto;
      overflow-y: hidden;
      -webkit-overflow-scrolling: touch;
    }

    &.chapter-13 .table-scroll > .content-table {
      display: table;
      width: 42rem;
      min-width: 100%;
      max-width: none;
      overflow: visible;
    }

    &.chapter-13 .table-scroll[aria-label^="表 13-2"] > .content-table {
      width: 32rem;
    }
  }
}