/* Reading controls and long-form article improvements. Load after style.css. */
.reading-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin: 14px 0 18px;
  color: #666;
  font-size: 13px;
}

.reading-control {
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid #d9e0e6;
  border-radius: 4px;
  background: #fff;
  color: #34495e;
  cursor: pointer;
  font: inherit;
}

.reading-control:hover,
.reading-control[aria-pressed="true"] {
  border-color: #2196f3;
  color: #0a6ebd;
}

.reading-control:focus-visible,
.reading-code-button:focus-visible,
.reading-toc-close:focus-visible,
.reading-toc-toggle:focus-visible {
  outline: 3px solid #1976d2;
  outline-offset: 2px;
}

.reading-font-status {
  min-width: 3.5em;
  text-align: center;
}

.reading-toc-toggle {
  display: none;
}

.reading-toc-toggle button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 4px 10px;
  border: 1px solid #d9e0e6;
  border-radius: 4px;
  background: #fff;
  color: #34495e;
  font: inherit;
  cursor: pointer;
}

.reading-toc-layer {
  position: relative;
}

.reading-toc-close {
  display: none;
}

.reading-toc .toc-item.is-current > a,
.reading-toc .toc-item > a.is-current {
  color: #0a6ebd;
  font-weight: 700;
}

.reading-toc .toc-item.is-current::before {
  position: absolute;
  top: 0.55em;
  left: -10px;
  width: 3px;
  height: 1em;
  background: #2196f3;
  content: "";
}

.reading-toc .toc-item > a {
  display: inline-block;
  max-width: 100%;
  padding: 2px 0;
  overflow-wrap: anywhere;
}

.reading-toc {
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.reading-toc .slimContent {
  height: auto;
  overflow: visible;
}

/* Avoid showing a hand-written chapter index beside the generated desktop TOC. */
@media (min-width: 768px) {
  body:not(.reading-mode) .article-entry.has-reading-sidebar .reading-index-heading,
  body:not(.reading-mode) .article-entry.has-reading-sidebar .reading-index-content {
    display: none !important;
  }
}

/* The theme header is fixed on phones; leave room when navigating to anchors. */
.article-entry h1[id],
.article-entry h2[id],
.article-entry h3[id],
.article-entry h4[id],
.article-entry h5[id],
.article-entry h6[id],
.article-entry > a[id] {
  scroll-margin-top: 24px;
}

.article-entry > a[id] {
  display: block;
  height: 0;
}

/* Wrap Markdown tables independently so a wide table never widens the page. */
.reading-table-wrap {
  width: 100%;
  max-width: 100%;
  margin: 1.25em 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
  border: 1px solid #e6eaf0;
  border-radius: 4px;
}

.reading-table-wrap:focus-visible {
  outline: 3px solid #1976d2;
  outline-offset: 2px;
}

.reading-table-wrap > table {
  width: max-content;
  min-width: 100%;
  margin: 0;
}

.reading-table-wrap > table th,
.reading-table-wrap > table td {
  padding: 8px 10px;
  border: 1px solid #e6eaf0;
  vertical-align: top;
}

/* Keep line numbers in their own column; clipboard reads only the code column. */
.reading-code-block[data-reading-code-block] {
  position: relative;
}

.reading-code-tools {
  position: absolute;
  z-index: 2;
  top: 3px;
  right: 7px;
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: calc(100% - 75px);
}

.reading-code-button {
  min-height: 25px;
  padding: 2px 7px;
  border: 1px solid #d4d9df;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.94);
  color: #3f4b57;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
}

.reading-code-button:hover,
.reading-code-button[aria-pressed="true"] {
  border-color: #2196f3;
  color: #0a6ebd;
}

.reading-code-button[hidden] {
  display: none !important;
}

.reading-copy-status {
  max-width: 12em;
  overflow: hidden;
  color: #386641;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reading-code-block.is-collapsed {
  max-height: 23rem;
  overflow: hidden;
}

.reading-code-block.is-wrapped .code pre,
.reading-code-plain.is-wrapped pre {
  white-space: pre-wrap !important;
  overflow-wrap: anywhere;
  word-break: normal;
}

.reading-code-block.is-wrapped .code .line {
  height: auto;
  line-height: 1.5;
}

.reading-code-plain {
  padding-top: 34px !important;
}

/* Focused reading mode remains reversible from its toolbar. */
body.reading-mode {
  --reading-font-size: 18px;
  --reading-line-height: 1.78;
  --reading-content-width: 74ch;
  padding-top: 0 !important;
}

body.reading-mode .header,
body.reading-mode .sidebar,
body.reading-mode .footer,
body.reading-mode .bar-footer,
body.reading-mode .article-footer,
body.reading-mode #comments,
body.reading-mode .donate-box {
  display: none !important;
}

body.reading-mode .main {
  float: none !important;
  width: 100% !important;
  min-height: 0;
  margin: 0 !important;
  padding: 20px clamp(16px, 4vw, 48px);
}

body.reading-mode .main .content {
  width: 100%;
  max-width: var(--reading-content-width);
  min-height: 0;
  margin: 0 auto;
}

body.reading-mode .reading-controls {
  position: sticky;
  z-index: 20;
  top: 0;
  padding: 8px 0;
  background: rgba(255, 255, 255, 0.96);
}

body.reading-mode .article-entry {
  font-size: var(--reading-font-size);
  line-height: var(--reading-line-height);
}

/* Keep heading targets below the sticky reading controls after TOC navigation. */
body.reading-mode .article-entry h1[id],
body.reading-mode .article-entry h2[id],
body.reading-mode .article-entry h3[id],
body.reading-mode .article-entry h4[id],
body.reading-mode .article-entry h5[id],
body.reading-mode .article-entry h6[id],
body.reading-mode .article-entry > a[id] {
  scroll-margin-top: 72px;
}

body.reading-mode .article-entry.reading-line-loose {
  --reading-line-height: 1.95;
}

.article-entry.reading-font-adjusted {
  font-size: var(--reading-font-size);
}

.article-entry.reading-line-loose {
  line-height: 1.9;
}

body.reading-mode.reading-width-wide {
  --reading-content-width: 88ch;
}

@media (max-width: 767px) {
  .article-entry h1[id],
  .article-entry h2[id],
  .article-entry h3[id],
  .article-entry h4[id],
  .article-entry h5[id],
  .article-entry h6[id],
  .article-entry > a[id] {
    scroll-margin-top: 72px;
  }

  .reading-toc-toggle {
    display: block;
  }

  .reading-toc-toggle button {
    min-width: 44px;
    min-height: 44px;
  }

  .reading-toc-backdrop:not([hidden]) {
    position: fixed;
    z-index: 1039;
    inset: 53px 0 0;
    display: block;
    background: rgba(15, 23, 42, 0.45);
  }

  .reading-toc {
    display: none !important;
  }

  .reading-toc.is-mobile-open {
    position: fixed;
    z-index: 1040;
    top: 53px;
    right: 0;
    bottom: 0;
    left: 0;
    display: block !important;
    width: auto;
    max-height: none;
    padding: 0;
    overflow: auto;
    border: 0;
    background: #fff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  }

  .reading-toc.is-mobile-open .slimContent,
  .reading-toc.is-mobile-open .slimScrollDiv {
    width: 100% !important;
    height: auto !important;
    max-height: none !important;
    overflow: visible !important;
  }

  .reading-toc.is-mobile-open .article-toc {
    padding: 18px 22px 32px;
  }

  .reading-toc-close {
    display: inline-flex;
    float: right;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin: -8px -8px 0 8px;
    border: 0;
    background: transparent;
    color: #34495e;
    cursor: pointer;
    font-size: 28px;
  }

  body.reading-toc-open {
    overflow: hidden;
  }

  body.reading-mode .main {
    padding: 12px 16px;
  }

  body.reading-mode .reading-controls {
    gap: 4px;
    margin-right: -16px;
    margin-left: -16px;
    padding: 8px 16px;
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  body.reading-mode .reading-control {
    flex: 0 0 auto;
  }

  .reading-code-tools {
    right: 4px;
    gap: 3px;
  }

  .reading-code-button {
    min-width: 44px;
    min-height: 44px;
    padding-right: 5px;
    padding-left: 5px;
    font-size: 11px;
  }

  .reading-code-block.highlight,
  .reading-code-plain {
    padding-top: 50px !important;
  }

  .reading-copy-status {
    max-width: 6em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html:focus-within {
    scroll-behavior: auto !important;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Width is adjustable when the sidebars are hidden in reading mode. */
.reading-controls [data-reading-width] { display: none; }
body.reading-mode .reading-controls [data-reading-width] { display: inline-block; }

@media (min-width: 768px) {
  .bar-footer .pager .reading-toc-toggle { display: none; }
}