.post-outline {
  padding: 1rem;
  border: 1px solid var(--kb-color-border);
  border-radius: var(--kb-radius-panel);
  background: var(--kb-color-surface-strong);
  box-shadow: var(--kb-shadow);
  backdrop-filter: blur(10px);
  animation: kb-fade-up 760ms var(--kb-motion-slow) both;
}

.post-outline[hidden] {
  display: none;
}

.post-outline-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.post-outline-close {
  display: none;
}

.post-outline-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-top: 0.85rem;
  max-height: calc(100vh - 8rem);
  overflow: auto;
}

.post-outline-section {
  padding-top: 0.35rem;
  border-top: 1px solid rgba(61, 48, 34, 0.08);
}

.post-outline-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.post-outline-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  width: 100%;
  padding: 0.55rem 0;
  border: 0;
  background: transparent;
  color: var(--kb-color-muted);
  text-align: left;
  cursor: pointer;
  transition:
    color var(--kb-motion-fast),
    transform var(--kb-motion-fast);
}

.post-outline-trigger:hover {
  color: var(--kb-color-text);
  transform: translateX(0.1rem);
}

.post-outline-trigger.is-active,
.post-outline-section.is-active .post-outline-trigger {
  color: var(--kb-color-text);
}

.post-outline-order {
  color: rgba(47, 36, 24, 0.4);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

.post-outline-heading {
  min-width: 0;
  font-size: 0.94rem;
  line-height: 1.6;
}

.post-outline-children {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  margin: 0.1rem 0 0 0.35rem;
  opacity: 0;
  transform: translateY(-0.3rem) scaleY(0.98);
  transform-origin: top center;
  will-change: grid-template-rows, opacity, transform;
  transition:
    grid-template-rows var(--kb-motion-collapse),
    opacity 240ms ease,
    transform var(--kb-motion-collapse),
    margin-bottom var(--kb-motion-collapse);
}

.post-outline-children-inner {
  min-height: 0;
  overflow: hidden;
  padding-left: 0.85rem;
  border-left: 1px solid transparent;
  transition: border-color var(--kb-motion-collapse);
}

.post-outline-section.is-active .post-outline-children {
  grid-template-rows: 1fr;
  margin-bottom: 0.55rem;
  opacity: 1;
  transform: translateY(0) scaleY(1);
}

.post-outline-section.is-active .post-outline-children-inner {
  border-left-color: var(--kb-color-outline-rail);
}

.post-outline-link {
  display: block;
  padding: 0.3rem 0;
  color: var(--kb-color-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  transition:
    color var(--kb-motion-fast),
    transform var(--kb-motion-fast);
}

.post-outline-link[data-depth="2"] {
  padding-left: 0.7rem;
}

.post-outline-link[data-depth="3"] {
  padding-left: 1.4rem;
}

.post-outline-link[data-depth="4"],
.post-outline-link[data-depth="5"] {
  padding-left: 2rem;
}

.post-outline-link.is-active {
  color: var(--kb-color-text);
}

.post-outline-link:hover {
  color: var(--kb-color-text);
  transform: translateX(0.12rem);
}

.post-content {
  font-size: 1.03rem;
  color: var(--kb-color-body-text);
}

.post-content > :first-child {
  margin-top: 0;
}

.post-content > :last-child {
  margin-bottom: 0;
}

.post-content p,
.post-content ul,
.post-content ol,
.post-content blockquote,
.post-content pre,
.post-content table,
.post-content figure,
.post-content hr {
  margin: 1.4rem 0;
}

.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  margin: 2.6rem 0 0.9rem;
  color: var(--kb-color-heading-text);
  line-height: 1.35;
}

.post-content ul,
.post-content ol {
  padding-left: 1.4rem;
  color: var(--kb-color-list-text);
}

.post-content li,
.post-content li::marker {
  color: var(--kb-color-list-text);
}

.post-content li + li {
  margin-top: 0.45rem;
}

.post-content blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 2px solid rgba(47, 36, 24, 0.28);
  color: var(--kb-color-muted);
}

.post-content a {
  text-decoration: underline;
  text-decoration-color: rgba(47, 36, 24, 0.3);
  text-underline-offset: 0.16em;
}

.post-content a:hover {
  text-decoration-color: currentColor;
}

.post-content strong,
.post-content b {
  color: var(--kb-color-strong-text);
}

.post-content code,
.post-content pre {
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.post-content :not(pre) > code {
  padding: 0.1rem 0.32rem;
  border-radius: var(--kb-radius-inline);
  background: var(--kb-color-accent-soft);
}

.post-content pre {
  overflow: auto;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(61, 48, 34, 0.08);
  border-radius: var(--kb-radius-panel);
  background: rgba(240, 231, 219, 0.9);
}

.post-content pre code {
  padding: 0;
  background: transparent;
}

.post-content pre.shiki,
.post-content pre:has(> code.hljs) {
  padding: 0;
  border: 0;
  border-radius: 0.75rem;
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(61, 48, 34, 0.1);
}

.post-content pre.shiki code,
.post-content pre > code.hljs {
  display: block;
  min-width: 100%;
  padding: 1rem 1.1rem;
  border-radius: inherit;
}

.post-content pre.shiki .line {
  display: block;
}

.post-content .hljs {
  line-height: 1.7;
}

.post-content img {
  margin: 2rem auto;
  cursor: zoom-in;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
}

.post-content th,
.post-content td {
  padding: 0.75rem;
  border: 1px solid rgba(61, 48, 34, 0.1);
  text-align: left;
}

.post-content hr {
  border: 0;
  border-top: 1px solid var(--kb-color-border);
}

.post-navigation {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 2.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--kb-color-border);
}

.post-navigation-link,
.post-navigation-spacer {
  min-height: 4.45rem;
}

.post-navigation-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.28rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--kb-color-border);
  border-radius: calc(var(--kb-radius-panel) - 0.1rem);
  background: var(--kb-color-surface-strong);
  transition:
    background-color var(--kb-motion-fast),
    border-color var(--kb-motion-fast),
    box-shadow var(--kb-motion-fast),
    transform var(--kb-motion-fast);
}

.post-navigation-link:hover {
  background: var(--kb-color-float-bg-hover);
  border-color: rgba(61, 48, 34, 0.18);
  box-shadow: 0 12px 28px rgba(35, 26, 18, 0.06);
}

.post-navigation-link--center {
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.16rem;
}

.post-navigation-link--next {
  text-align: right;
}

.post-navigation .post-navigation-label {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
}

.post-navigation-title {
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.45;
}

.post-navigation-title--index {
  font-size: 1.08rem;
  letter-spacing: 0.08em;
}

.post-navigation-spacer {
  display: block;
}

.site-footer--cover {
  width: min(calc(100% - 2rem), 52rem);
}

.page-article {
  width: min(100%, 58rem);
  margin: 0 auto;
}

.preface-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 2.5rem;
}

.page-comment {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--kb-color-border);
}

.page-comment-header {
  margin-bottom: 1rem;
}

.page-comment-title {
  margin: 0.7rem 0 0;
  font-size: 1.4rem;
  font-weight: 600;
}

.quick-return {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem;
  border: 1px solid rgba(61, 48, 34, 0.12);
  border-radius: calc(var(--kb-radius-panel) + 0.1rem);
  background: var(--kb-color-float-bg);
  box-shadow: 0 18px 40px rgba(35, 26, 18, 0.12);
  backdrop-filter: blur(14px);
  animation: kb-fade-up 880ms var(--kb-motion-slow) both;
  transition:
    background-color var(--kb-motion-base),
    border-color var(--kb-motion-base),
    box-shadow var(--kb-motion-base),
    transform var(--kb-motion-fast);
}

.quick-return-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.3rem;
  padding: 0 0.95rem;
  border: 1px solid transparent;
  border-radius: calc(var(--kb-radius-control) - 0.1rem);
  background: transparent;
  color: var(--kb-color-muted);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  appearance: none;
}

.quick-return-link--top {
  min-width: 4.25rem;
}