/* v0.5: responsive desktop reading layout and chapter navigation */
:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 72%, white);
  outline-offset: 3px;
}

.sidebar {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel-solid) 72%, transparent);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.05);
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--accent) 44%, transparent) transparent;
  overscroll-behavior: contain;
}

.sidebar::-webkit-scrollbar {
  width: 8px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 48%, transparent);
  background-clip: padding-box;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--accent) 72%, transparent);
  background-clip: padding-box;
}

.toc-head {
  position: sticky;
  top: -12px;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: -12px -12px 10px;
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 92%, transparent);
  backdrop-filter: blur(16px);
}

.toc-head strong {
  display: block;
  font-size: 16px;
  line-height: 1.25;
}

.toc-kicker {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.toc-progress {
  flex: 0 0 auto;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 11px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.nav-list {
  gap: 8px;
}

.nav-level {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 7px 8px 2px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-level span:last-child {
  font-weight: 650;
  letter-spacing: 0.04em;
}

.nav-level.advanced {
  margin-top: 4px;
  color: var(--warn);
}

.nav-level.overview,
.nav-level.release {
  color: var(--good);
}

.nav-chapter {
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
}

.nav-chapter[open] {
  border-color: var(--line);
  background: color-mix(in srgb, var(--panel-solid) 60%, transparent);
}

.nav-chapter summary {
  min-height: 48px;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  cursor: pointer;
  list-style: none;
  color: var(--muted);
  font-size: 13px;
  font-weight: 820;
  line-height: 1.3;
  transition: color 0.18s ease, background 0.18s ease;
}

.nav-chapter summary::-webkit-details-marker {
  display: none;
}

.nav-chapter summary:hover,
.nav-chapter[open] summary,
.nav-chapter.contains-active > summary {
  color: var(--text);
  background: var(--accent-soft);
}

.nav-chapter-no {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.nav-chevron {
  display: grid;
  place-items: center;
  font-size: 16px;
  transition: transform 0.2s ease;
}

.nav-chapter[open] .nav-chevron {
  transform: rotate(180deg);
}

.nav-chapter-links {
  display: grid;
  gap: 2px;
  padding: 2px 6px 8px;
}

.nav-link {
  min-height: 40px;
  align-items: center;
  padding: 8px 9px;
  font-size: 13px;
}

.nav-sublink {
  grid-template-columns: 34px 1fr;
  min-height: 34px;
  margin-left: 10px;
  padding-block: 6px;
  font-size: 12px;
}

.nav-sublink span:first-child {
  color: var(--accent);
}

.nav-link.active {
  box-shadow: inset 3px 0 0 var(--accent);
}

.nav-sublink.active {
  border-color: color-mix(in srgb, var(--accent) 38%, transparent);
  color: var(--text);
  background: linear-gradient(90deg, var(--accent-soft), color-mix(in srgb, var(--accent-soft) 34%, transparent));
  font-weight: 820;
}

.nav-sublink.active span:first-child {
  color: var(--accent);
  font-weight: 900;
}

.nav-new {
  display: inline-flex;
  align-items: center;
  margin-left: 5px;
  padding: 2px 5px;
  border: 1px solid color-mix(in srgb, var(--good) 42%, var(--line));
  border-radius: 999px;
  color: var(--good);
  background: color-mix(in srgb, var(--good) 10%, transparent);
  font-size: 8px;
  font-style: normal;
  font-weight: 950;
  line-height: 1;
  letter-spacing: 0.06em;
  vertical-align: 0.12em;
}

.section > h3[data-subsection] {
  position: relative;
  margin-top: 64px;
  padding-top: 34px;
  border-top: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line-strong));
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.section > h3[data-subsection]::before {
  content: attr(data-subsection);
  width: fit-content;
  display: block;
  margin-bottom: 12px;
  padding: 6px 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 36%, var(--line));
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 11px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

.card-icon {
  display: none;
}

.radar-cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.radar-cards .ghost-btn {
  width: 100%;
}

.chapter-tier {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin: -8px 0 24px 64px;
  color: var(--muted);
  font-size: 13px;
}

.chapter-tier span:first-child {
  padding: 5px 9px;
  border: 1px solid color-mix(in srgb, var(--warn) 38%, var(--line));
  border-radius: 999px;
  color: var(--warn);
  background: color-mix(in srgb, var(--warn) 9%, transparent);
  font-weight: 850;
}

.chapter-tier strong {
  color: var(--text);
}

.new-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-left: 7px;
  padding: 5px 8px;
  border: 1px solid color-mix(in srgb, var(--good) 46%, var(--line));
  border-radius: 999px;
  color: var(--good);
  background: color-mix(in srgb, var(--good) 11%, transparent);
  font-size: 10px;
  font-weight: 950;
  line-height: 1;
  letter-spacing: 0.07em;
  vertical-align: 0.24em;
  white-space: nowrap;
}

.new-panel {
  border-color: color-mix(in srgb, var(--good) 34%, var(--line));
  background: linear-gradient(145deg, color-mix(in srgb, var(--good) 8%, var(--panel-solid)), color-mix(in srgb, var(--panel-solid) 72%, transparent));
}

.capability-overview > h3[data-subsection] {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.capability-cards .card h4 {
  margin-bottom: 8px;
}

.release-version .section-head {
  margin-bottom: 18px;
}

.release-version h2 {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.release-entry {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: color-mix(in srgb, var(--panel-solid) 68%, transparent);
}

.release-entry summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
  padding: 14px 17px;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-weight: 850;
  transition: color 0.18s ease, background 0.18s ease;
}

.release-entry summary::-webkit-details-marker {
  display: none;
}

.release-entry summary:hover,
.release-entry[open] summary {
  color: var(--good);
  background: color-mix(in srgb, var(--good) 8%, transparent);
}

.release-chevron {
  flex: 0 0 auto;
  font-size: 18px;
  transition: transform 0.2s ease;
}

.release-entry[open] .release-chevron {
  transform: rotate(180deg);
}

.release-body {
  padding: 2px 20px 22px;
  border-top: 1px solid var(--line);
}

.release-body h3 {
  margin-top: 26px;
}

.section > p,
.section > ol:not([class]),
.section > ul:not([class]) {
  max-width: 78ch;
}

.table-wrap,
.flow {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--accent) 42%, transparent) transparent;
}

.table-wrap::-webkit-scrollbar,
.flow::-webkit-scrollbar {
  height: 7px;
}

.table-wrap::-webkit-scrollbar-track,
.flow::-webkit-scrollbar-track {
  background: transparent;
}

.table-wrap::-webkit-scrollbar-thumb,
.flow::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 48%, transparent);
  background-clip: padding-box;
}

@media (min-width: 1180px) {
  :root {
    --max: 1480px;
    --nav-w: 300px;
  }

  .layout {
    grid-template-columns: var(--nav-w) minmax(0, 1fr);
    gap: 42px;
    padding: 36px clamp(28px, 3.2vw, 52px) 110px;
  }

  .hero {
    min-height: 500px;
    padding: clamp(52px, 5vw, 82px);
  }

  .section {
    padding: clamp(38px, 3.4vw, 56px);
  }

  .cards {
    gap: 12px;
  }

  .card {
    padding: 18px;
  }

  .flow-node {
    flex: 1 1 0;
    min-width: 108px;
  }
}

@media (max-width: 940px) {
  body.nav-open {
    overflow: hidden;
  }

  .sidebar {
    inset: var(--header-h) auto 0 0;
    width: min(88vw, 360px);
    height: auto;
    padding: 14px;
    border-width: 0 1px 0 0;
    border-radius: 0 22px 22px 0;
    box-shadow: 24px 0 70px rgba(0, 0, 0, 0.28);
  }

  .toc-head {
    top: -14px;
    margin: -14px -14px 10px;
    padding: 18px 16px 14px;
  }

  .nav-chapter summary {
    min-height: 50px;
    font-size: 14px;
  }

  .nav-link {
    min-height: 44px;
    font-size: 14px;
  }

  .nav-sublink {
    min-height: 40px;
    font-size: 13px;
  }

  .radar-cards {
    grid-template-columns: 1fr;
  }

  .chapter-tier {
    margin-left: 52px;
  }
}

@media (max-width: 640px) {
  .toc-progress {
    font-size: 10px;
  }

  .section > p,
  .section > ol:not([class]),
  .section > ul:not([class]) {
    max-width: none;
  }

  .chapter-tier {
    margin: -4px 0 20px;
  }

  .new-badge {
    margin-left: 0;
  }

  .release-entry summary {
    padding: 13px 14px;
  }

  .release-body {
    padding: 2px 15px 18px;
  }

  .section > h3[data-subsection] {
    margin-top: 50px;
    padding-top: 28px;
  }
}