:root {
  --blog-white: var(--bg, #FFFFFF);
  --blog-panel: var(--bg-panel, #F5F5F8);
  --blog-panel-2: var(--bg-panel-2, #EDEDF3);
  --blog-line: var(--border, #E3E3EA);
  --blog-ink: var(--text, #0E0E12);
  --blog-muted: var(--text-muted, #5E5E6B);
  --blog-action: var(--accent, #5038E0);
  --blog-action-hover: var(--accent-dark, #3A26B0);
  --blog-action-soft: var(--accent-soft, #EFEDFC);
  --blog-veil: var(--veil, rgb(14 14 18 / 40%));
  --blog-clear: var(--clear, transparent);
  --blog-radius: var(--r, 6px);
  --blog-radius-pill: var(--r-pill, 999px);
  --blog-body-font: var(--font-body, "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif);
  --blog-display-font: var(--font-display, "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif);
  --blog-code-font: var(--font-mono, "JetBrains Mono", ui-monospace, monospace);
  --blog-weight-display: var(--weight-display, 900);
  --blog-weight-medium: 600;
  --blog-text-size: 1rem;
  --blog-small-size: 0.8125rem;
  --blog-card-title-size: 1.25rem;
  --blog-list-title-size: clamp(1.875rem, 1.1rem + 2.6vw, 3rem);
  --blog-article-title-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
  --blog-lead-size: clamp(0.9375rem, 0.85rem + 0.45vw, 1.125rem);
  --blog-h2-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  --blog-h3-size: 1.25rem;
  --blog-close-size: 1.5rem;
  --blog-reading: var(--reading, 820px);
  --blog-gutter: var(--gutter, 40px);
  --blog-motion: 160ms;
  --blog-focus-width: 2px;
  --blog-focus-offset: 3px;
}

/* 列表 */
.blog-index {
  background: var(--blog-white);
  color: var(--blog-ink);
  font-family: var(--blog-body-font);
}

.blog-index main,
.blog-index section,
.post-card,
.article-hero,
.article-body,
.prose,
#related-posts,
#post-nav {
  min-width: 0;
}

.blog-skip {
  position: fixed;
  inset: 0.75rem auto auto 0.75rem;
  z-index: 1000;
  padding: 0.75rem 1rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-action);
  transform: translateY(-180%);
}

.blog-skip:focus {
  transform: translateY(0);
}

.blog-list-hero {
  padding-block: 3.5rem 3rem;
  background: var(--blog-white);
  color: var(--blog-ink);
}

.blog-eyebrow {
  margin: 0 0 1rem;
  color: var(--blog-muted);
  font-family: var(--blog-code-font);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.blog-list-hero h1 {
  display: block;
  margin: 0;
  max-width: 100%;
  font-family: var(--blog-display-font);
  font-size: var(--blog-list-title-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.25;
  overflow-wrap: break-word;
}

.blog-list-lead {
  max-width: 46rem;
  margin: 1.25rem 0 0;
  color: var(--blog-muted);
  font-size: var(--blog-lead-size);
  line-height: 1.8;
}

.blog-list-section {
  padding-block: 2rem 4rem;
  background: var(--blog-panel);
  color: var(--blog-ink);
}

.blog-list-toolbar {
  margin-bottom: 1.5rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blog-filter {
  min-height: 44px;
  padding: 0.625rem 1rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius-pill);
  background: var(--blog-white);
  color: var(--blog-muted);
  font-family: var(--blog-body-font);
  font-size: var(--blog-text-size);
  font-weight: var(--blog-weight-medium);
  line-height: 1.4;
  cursor: pointer;
  transition: color var(--blog-motion), background-color var(--blog-motion), border-color var(--blog-motion);
}

.blog-filter:hover {
  border-color: var(--blog-action);
  color: var(--blog-action);
}

.blog-filter[aria-pressed="true"] {
  border-color: var(--blog-action);
  background: var(--blog-action-soft);
  color: var(--blog-action);
}

.blog-count {
  min-height: 1.5em;
  margin: 1rem 0 0;
  color: var(--blog-muted);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.blog-post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 1.25rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 1.5rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-ink);
}

.post-card__meta,
.article-meta,
.article-hero__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.875rem;
  color: var(--blog-muted);
  font-size: var(--blog-small-size);
  line-height: 1.65;
}

.blog-tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-panel);
  color: var(--blog-muted);
  font-family: var(--blog-body-font);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.post-card h2,
.post-card h3 {
  display: block;
  margin: 1rem 0 0.75rem;
  max-width: 100%;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-card-title-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.post-card h2 a,
.post-card h3 a {
  color: var(--blog-ink);
  text-decoration: none;
}

.post-card h2 a:hover,
.post-card h3 a:hover {
  color: var(--blog-action);
}

.post-card__summary {
  margin: 0 0 1.25rem;
  color: var(--blog-muted);
  font-size: var(--blog-text-size);
  line-height: 1.8;
}

.post-card .post-card__link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--blog-action);
  font-size: var(--blog-text-size);
  font-weight: var(--blog-weight-medium);
  line-height: 1.65;
  text-decoration: none;
}

.post-card .post-card__link:hover {
  color: var(--blog-action-hover);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 1.5rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-muted);
  line-height: 1.8;
}

.blog-empty a {
  color: var(--blog-action);
}

/* 文章模板的面包屑位于主容器首部，留出页头呼吸空间。 */
main.wrap.reading:has(> article) {
  padding-top: 32px;
}

/* 面包屑：接住逐篇文章中常见的类名。 */
.blog-breadcrumb,
nav.breadcrumb,
nav.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.5rem;
  min-width: 0;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  padding: 0;
  overflow: hidden;
  color: var(--blog-muted);
  font-family: var(--blog-body-font);
  font-size: var(--blog-small-size);
  line-height: 1.7;
  white-space: nowrap;
}

.blog-breadcrumb a,
nav.breadcrumb a,
nav.breadcrumbs a {
  flex: 0 0 auto;
  color: var(--blog-muted);
  text-decoration: none;
}

.blog-breadcrumb a:hover,
nav.breadcrumb a:hover,
nav.breadcrumbs a:hover {
  color: var(--blog-action);
}

.blog-breadcrumb [aria-hidden="true"],
nav.breadcrumb [aria-hidden="true"],
nav.breadcrumbs [aria-hidden="true"],
.blog-breadcrumb .separator,
nav.breadcrumb .separator,
nav.breadcrumbs .separator {
  flex: 0 0 auto;
  color: var(--blog-muted);
  opacity: 0.55;
}

.blog-breadcrumb [aria-current="page"],
nav.breadcrumb [aria-current="page"],
nav.breadcrumbs [aria-current="page"] {
  flex: 0 1 auto;
  min-width: 0;
  max-width: 30ch;
  overflow: hidden;
  color: var(--blog-muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section:has(.blog-breadcrumb),
.section:has(nav.breadcrumb),
.section:has(nav.breadcrumbs) {
  padding-top: 0.25rem;
  padding-bottom: 0;
}

/* 文章页首使用独立的紧凑节奏，不继承首页 section 留白。 */
.article-hero,
.article-hero.section {
  padding-top: 0.5rem;
  padding-bottom: 1.5rem;
  background: var(--blog-white);
  color: var(--blog-ink);
}

.article-hero .article-meta,
.article-hero .article-hero__meta,
.article-hero .post-card__meta {
  margin-top: 0;
  margin-bottom: 1rem;
}

.article-hero h1 {
  display: block;
  max-width: 100%;
  margin: 0.875rem 0 0.75rem;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-article-title-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.32;
  overflow-wrap: break-word;
}

.article-hero .article-lead,
.article-hero .article-hero__lead,
.article-hero .lead,
.article-hero > p:last-child {
  max-width: 100%;
  margin-top: 1rem;
  margin-bottom: 0;
  color: var(--blog-muted);
  font-size: var(--blog-lead-size);
  line-height: 1.7;
}

.article-body,
.prose {
  color: var(--blog-ink);
  font-family: var(--blog-body-font);
  font-size: var(--blog-text-size);
  line-height: 1.9;
  overflow-wrap: break-word;
}

.article-body.section,
.section:has(> .article-body),
.section:has(> .wrap > .article-body) {
  padding-top: 0;
  padding-bottom: 2rem;
}

.article-body > section,
.article-body section.section,
.prose > section,
.prose section.section {
  margin-block: 1.5rem;
  padding-block: 0;
}

.article-body > section:first-child,
.prose > section:first-child {
  margin-top: 0;
}

.article-body h2,
.prose h2 {
  display: block;
  margin: 2rem 0 1rem;
  max-width: 100%;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.5;
}

.article-body h3,
.prose h3 {
  display: block;
  margin: 1.5rem 0 0.75rem;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-h3-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.55;
}

.article-body > h2:first-child,
.article-body > section:first-child > h2:first-child,
.prose > h2:first-child,
.prose > section:first-child > h2:first-child {
  margin-top: 0;
}

.article-body p,
.prose p,
.article-body ul,
.article-body ol,
.prose ul,
.prose ol {
  margin-block: 0 1rem;
}

.article-body li + li,
.prose li + li {
  margin-top: 0.375rem;
}

.article-body ul,
.article-body ol,
.prose ul,
.prose ol {
  padding-inline-start: 1.5rem;
}

.article-body a:not([class*="btn"]):not([class*="button"]),
.prose a:not([class*="btn"]):not([class*="button"]) {
  color: var(--blog-action);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.article-body a:not([class*="btn"]):not([class*="button"]):hover,
.prose a:not([class*="btn"]):not([class*="button"]):hover {
  color: var(--blog-action-hover);
}

.article-body code,
.prose code {
  font-family: var(--blog-code-font);
  overflow-wrap: anywhere;
}

.article-body :not(pre) > code,
.prose :not(pre) > code {
  padding: 0.1em 0.3em;
  border-radius: var(--blog-radius);
  background: var(--blog-panel);
  color: var(--blog-ink);
}

.article-body pre,
.prose pre {
  max-width: 100%;
  margin: 1.25rem 0;
  padding: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-panel);
  color: var(--blog-ink);
  font-family: var(--blog-code-font);
  font-size: var(--blog-small-size);
  line-height: 1.8;
  white-space: pre;
  tab-size: 2;
}

.article-body pre code,
.prose pre code {
  padding: 0;
  background: var(--blog-clear);
  color: inherit;
  white-space: inherit;
  overflow-wrap: normal;
}

.article-body blockquote,
.prose blockquote {
  margin: 1.25rem 0;
  padding: 1rem 1.25rem;
  border-inline-start: 2px solid var(--blog-action);
  background: var(--blog-panel);
  color: var(--blog-ink);
}

.article-body blockquote > :last-child,
.prose blockquote > :last-child {
  margin-bottom: 0;
}

.article-body img,
.prose img {
  max-width: 100%;
  height: auto;
}

.article-body table,
.prose table {
  display: block;
  max-width: 100%;
  margin-block: 1.25rem;
  overflow-x: auto;
  border-collapse: collapse;
  background: var(--blog-white);
  color: var(--blog-ink);
  font-size: var(--blog-text-size);
}

.article-body th,
.article-body td,
.prose th,
.prose td {
  min-width: 7em;
  padding: 0.75rem 1rem;
  border: 1px solid var(--blog-line);
  text-align: start;
  vertical-align: top;
  word-break: normal;
}

.article-body th,
.prose th {
  background: var(--blog-panel);
  color: var(--blog-ink);
  font-weight: var(--blog-weight-medium);
}

/* 静态文末卡：与 components.css 的按钮皮肤保持独立。 */
.dl-card,
.article-download {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-block: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-panel);
  color: var(--blog-ink);
}

.dl-card .article-download__copy,
.article-download__copy {
  flex: 1 1 18rem;
  min-width: 0;
}

.dl-card h2,
.article-download h2 {
  display: block;
  margin: 0 0 0.625rem;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.5;
}

.dl-card p,
.article-download p {
  margin: 0;
  color: var(--blog-muted);
  font-size: var(--blog-text-size);
  line-height: 1.8;
}

.dl-card__actions,
.article-download__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* 阅读版心内最多两列，每列至少 300px；更窄时自动退回单列。 */
#related-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 1rem;
  width: 100%;
  max-width: var(--blog-reading);
  margin: 2rem auto;
  color: var(--blog-ink);
}

#related-posts > h2 {
  display: block;
  grid-column: 1 / -1;
  margin: 0 0 0.25rem;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.5;
}

#related-posts:empty,
#post-nav:empty {
  display: none;
}

#related-posts .post-card {
  margin: 0;
}

#related-posts .post-card h3 {
  margin-top: 1rem;
  font-size: var(--blog-card-title-size);
}

#related-posts .post-card h3 a,
#related-posts .post-card h3 a:not([class*="btn"]):not([class*="button"]) {
  color: var(--blog-ink);
  text-decoration: none;
}

#related-posts .post-card h3 a:hover {
  color: var(--blog-action);
}

#related-posts .post-card__summary {
  margin-bottom: 1.25rem;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  width: 100%;
  max-width: var(--blog-reading);
  margin: 2rem auto;
}

#post-nav .post-nav__card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-ink);
  text-decoration: none;
  transition: border-color var(--blog-motion);
}

#post-nav .post-nav__card:hover {
  border-color: var(--blog-action);
}

.post-nav__card--prev {
  grid-column: 1;
}

.post-nav__card--next {
  grid-column: 2;
}

.post-nav__label {
  color: var(--blog-muted);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.post-nav__title {
  color: var(--blog-ink);
  font-size: var(--blog-text-size);
  font-weight: var(--blog-weight-medium);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

/* 使用独立命名，避免覆盖共享 .dl-modal、.dl-fab 与按钮皮肤。 */
html.blog-download-lock {
  overflow: hidden;
}

.blog-download-dialog {
  box-sizing: border-box;
  position: fixed;
  inset: 0;
  width: min(30rem, calc(100% - 2rem));
  max-width: calc(100% - 2rem);
  max-height: calc(100dvh - 2rem);
  margin: auto;
  padding: 2rem;
  overflow-y: auto;
  border: 1px solid var(--blog-line);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-ink);
  font-family: var(--blog-body-font);
  opacity: 0;
  transform: translateY(0.5rem);
  transition: opacity var(--blog-motion), transform var(--blog-motion);
}

.blog-download-dialog::backdrop {
  background: var(--blog-veil);
  opacity: 0;
  transition: opacity var(--blog-motion);
}

.blog-download-dialog.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.blog-download-dialog.is-visible::backdrop {
  opacity: 1;
}

.blog-download-dialog__close {
  position: absolute;
  inset: 0.5rem 0.5rem auto auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--blog-clear);
  border-radius: var(--blog-radius);
  background: var(--blog-white);
  color: var(--blog-muted);
  font-family: var(--blog-body-font);
  font-size: var(--blog-close-size);
  line-height: 1;
  cursor: pointer;
}

.blog-download-dialog__close:hover {
  border-color: var(--blog-line);
  background: var(--blog-panel);
  color: var(--blog-ink);
}

.blog-download-dialog__eyebrow {
  margin: 0 2rem 1rem 0;
  color: var(--blog-muted);
  font-size: var(--blog-small-size);
  line-height: 1.6;
}

.blog-download-dialog h2 {
  display: block;
  margin: 0 0 1rem;
  color: var(--blog-ink);
  font-family: var(--blog-display-font);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-weight-display);
  line-height: 1.5;
}

.blog-download-dialog__description {
  margin: 0 0 1.5rem;
  color: var(--blog-muted);
  font-size: var(--blog-text-size);
  line-height: 1.8;
}

.blog-filter:focus-visible,
.blog-skip:focus-visible,
.post-card a:focus-visible,
.blog-breadcrumb a:focus-visible,
nav.breadcrumb a:focus-visible,
nav.breadcrumbs a:focus-visible,
#post-nav a:focus-visible,
.blog-download-dialog button:focus-visible,
.blog-download-dialog a:focus-visible {
  outline: var(--blog-focus-width) solid var(--blog-action);
  outline-offset: var(--blog-focus-offset);
}

@media (max-width: 1000px) {
  .blog-post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --blog-list-title-size: clamp(1.5rem, 5vw, 1.875rem);
    --blog-article-title-size: 1.5rem;
    --blog-gutter: 20px;
  }

  .blog-list-hero {
    padding-block: 2rem;
  }

  .blog-list-section {
    padding-block: 1.5rem 2.5rem;
  }

  .blog-post-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-card {
    padding: 1.25rem;
  }

  .blog-filter {
    padding-inline: 0.875rem;
  }

  .article-hero,
  .article-hero.section {
    padding-top: 0.25rem;
    padding-bottom: 1.25rem;
  }

  .article-body pre,
  .prose pre {
    padding: 1rem;
  }

  .dl-card,
  .article-download {
    align-items: stretch;
    flex-direction: column;
    padding: 1.25rem;
  }

  .dl-card .article-download__copy,
  .article-download__copy {
    flex-basis: auto;
  }

  #post-nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav__card--prev,
  .post-nav__card--next {
    grid-column: 1;
  }

  .blog-download-dialog {
    padding: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filter,
  #post-nav .post-nav__card,
  .blog-download-dialog,
  .blog-download-dialog::backdrop {
    transition: none;
  }

  .blog-download-dialog {
    transform: none;
  }
}