:root {
  --blog-column: 56rem;
  --blog-title-list: clamp(2rem, 5vw, 3rem);
  --blog-title-article: clamp(1.8rem, 4vw, 2.6rem);
  --blog-heading: clamp(1.3rem, 3vw, 1.6rem);
  --blog-subheading: 1.3rem;
  --blog-body: 1rem;
  --blog-small: 0.875rem;
  --blog-micro: 0.75rem;
  --blog-lead: 1.0625rem;
  --blog-brand-size: 1.5rem;
  --blog-tracking: -0.015em;
  --blog-weight-normal: 400;
  --blog-weight-strong: 600;
  --blog-radius: var(--r-md, 12px);
  --blog-radius-small: var(--r-sm, 8px);
  --blog-pill: var(--r-pill, 999px);
  --blog-tint: color-mix(in srgb, var(--accent) 10%, var(--panel));
  --blog-tint-strong: color-mix(in srgb, var(--accent) 17%, var(--panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 12%, var(--panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 12%, var(--panel));
  --blog-paper-ink: var(--panel);
  --blog-shadow: 0 14px 40px color-mix(in srgb, var(--accent) 10%, transparent);
  --blog-inset: inset 0 1px 0 var(--hi);
  --blog-transition: 160ms;
}

.blog-page {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

.blog-page *,
.reading-wrap *,
.article-hero * {
  box-sizing: border-box;
}

.blog-skip {
  position: fixed;
  top: 0.75rem;
  left: var(--gutter);
  z-index: 100;
  padding: 0.75rem 1rem;
  border-radius: var(--blog-radius-small);
  background: var(--panel);
  color: var(--accent-dark);
  transform: translateY(-200%);
}

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

.blog-main {
  padding-block: 2.5rem 4rem;
}

.blog-hero {
  position: relative;
  isolation: isolate;
  padding: 3rem 2rem;
  margin-bottom: 2rem;
}

.blog-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 1rem 15% 1.5rem 0;
  border-radius: var(--blog-radius);
  background: var(--panel-2);
  box-shadow: var(--blog-inset);
}

.blog-eyebrow {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
}

.blog-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--blog-title-list);
  font-weight: var(--blog-weight-normal);
  line-height: 1.3;
}

.blog-hero__lead {
  max-width: 42rem;
  margin: 1.25rem 0 0 1.5rem;
  font-size: var(--blog-lead);
  line-height: 1.8;
  color: var(--text-muted);
}

.blog-page h1,
.blog-page h2,
.blog-page h3,
.article-hero h1,
.article-body h2,
.article-body h3,
#related-posts h2,
#related-posts h3 {
  display: block;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.blog-filters button {
  appearance: none;
  padding: 0.625rem 1rem;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--blog-pill);
  background: var(--panel);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-small);
  cursor: pointer;
}

.blog-filters button[aria-pressed="true"] {
  background: var(--text);
  border-color: var(--text);
  color: var(--panel);
}

.blog-filters button:hover {
  border-color: var(--text-muted);
}

.blog-status {
  min-height: 1.8em;
  margin: 1rem 0;
  font-size: var(--blog-small);
  color: var(--text-muted);
}

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--blog-inset);
  transition: border-color var(--blog-transition), box-shadow var(--blog-transition);
}

.article-card:hover,
.article-card:focus-within {
  border-color: var(--accent);
  box-shadow: var(--blog-shadow);
}

.article-card__meta,
.article-meta,
.article-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem 0.75rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
  line-height: 1.6;
}

.article-card .tag,
.article-meta .tag,
.article-hero__meta .tag {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: var(--blog-pill);
  background: var(--text);
  color: var(--panel);
  overflow-wrap: anywhere;
}

.article-card .article-card__title {
  margin: 1rem 0 0.75rem;
  font-size: var(--blog-subheading);
  font-weight: var(--blog-weight-strong);
  line-height: 1.6;
}

.article-card__title a {
  color: var(--text);
  text-decoration: none;
}

.article-card__title a:hover {
  color: var(--accent-dark);
}

.article-card__summary {
  margin: 0 0 1.25rem;
  font-size: var(--blog-body);
  line-height: 1.85;
  color: var(--text-muted);
}

.article-card__read {
  align-self: flex-start;
  margin-top: auto;
  color: var(--accent-dark);
  font-size: var(--blog-small);
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 2rem;
  border: 1px dashed var(--border);
  border-radius: var(--blog-radius);
  background: var(--panel);
  line-height: 1.8;
  color: var(--text-muted);
}

/* 阅读列的外盒包含两侧内衬，标题与正文共享相同左缘。 */
.reading-wrap,
.article-hero,
.breadcrumbs {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-column) + var(--gutter) + var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.reading-wrap .breadcrumbs {
  max-width: 100%;
  padding-inline: 0;
}

.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  padding-top: 0.25rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.65rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumbs li + li::before {
  content: "›";
  margin-right: 0.65rem;
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--accent-dark);
  text-underline-offset: 0.2em;
}

.article-hero {
  position: relative;
  isolation: isolate;
  padding-block: 2rem 2.25rem;
  margin-bottom: 1rem;
}

.article-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0.625rem;
  bottom: 1.25rem;
  left: var(--gutter);
  right: 12%;
  border-radius: var(--blog-radius);
  background: var(--blog-tint);
  box-shadow: var(--blog-inset);
  pointer-events: none;
}

.article-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: 1.25rem;
  right: calc(var(--gutter) + 0.5rem);
  width: 24%;
  height: 3px;
  border-radius: var(--blog-pill);
  background: var(--accent);
  pointer-events: none;
}

.article-hero h1 {
  margin: 1.25rem 0;
  font-family: var(--font-display);
  font-size: var(--blog-title-article);
  font-weight: var(--blog-weight-normal);
  line-height: 1.45;
}

.article-hero .article-meta,
.article-hero .article-hero__meta,
.article-hero .article-summary,
.article-hero .article-hero__summary,
.article-hero > p {
  margin-left: 1.25rem;
}

.article-hero time,
.article-hero .read-time,
.article-hero .reading-time {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-pill);
  background: var(--panel);
  color: var(--text-muted);
  font-size: var(--blog-small);
}

.article-summary,
.article-hero__summary,
.article-hero > p {
  margin-block: 1rem 0;
  color: var(--text-muted);
  font-size: var(--blog-lead);
  line-height: 1.85;
}

.article-body.prose {
  counter-reset: flat-section;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body);
  line-height: 1.9;
  overflow-wrap: anywhere;
}

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

.article-body.prose h2 {
  counter-increment: flat-section;
  margin: 2.25rem 0 1rem;
  font-size: var(--blog-heading);
  font-weight: var(--blog-weight-strong);
  line-height: 1.6;
  scroll-margin-top: var(--anchor-offset);
}

.article-body.prose > h2:first-child,
.article-body.prose > section:first-child > h2:first-child {
  margin-top: 0.75rem;
}

.article-body.prose h2::before {
  content: counter(flat-section, decimal-leading-zero);
  display: inline-block;
  margin-right: 0.65rem;
  padding: 0.05rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius-small);
  background: var(--panel-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  vertical-align: 0.1em;
}

.article-body.prose h3 {
  margin: 1.75rem 0 0.75rem;
  font-size: var(--blog-subheading);
  font-weight: var(--blog-weight-strong);
  line-height: 1.65;
}

.article-body.prose a {
  color: var(--accent-dark);
  text-underline-offset: 0.22em;
}

.article-body.prose li + li {
  margin-top: 0.5rem;
}

.article-body.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid var(--text-muted);
  border-radius: var(--blog-radius-small);
  background: var(--panel-2);
  color: var(--text-muted);
}

.article-body.prose .table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius-small);
}

.article-body.prose table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: var(--blog-small);
  line-height: 1.7;
}

.article-body.prose .table-scroll table {
  margin: 0;
  min-width: 36rem;
}

.article-body.prose th,
.article-body.prose td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.article-body.prose thead th {
  background: var(--text);
  color: var(--panel);
  font-weight: var(--blog-weight-strong);
}

.article-body.prose tbody tr:nth-child(even) {
  background: var(--panel-2);
}

.article-body.prose tbody tr:nth-child(odd) {
  background: var(--panel);
}

.article-body.prose tbody tr:hover {
  background: var(--blog-tint);
}

.article-body.prose pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 2.75rem 1.25rem 1.25rem;
  border: 1px solid var(--text-muted);
  border-radius: var(--blog-radius);
  background: var(--text);
  color: var(--blog-paper-ink);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  line-height: 1.8;
  white-space: pre;
}

.article-body.prose pre::before {
  content: "";
  position: absolute;
  top: 1rem;
  left: 1.25rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: var(--blog-pill);
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

.article-body.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.article-body.prose :not(pre) > code {
  padding: 0.15em 0.35em;
  border-radius: var(--blog-radius-small);
  background: var(--panel-2);
  color: var(--text);
  overflow-wrap: anywhere;
}

.article-body.prose pre code {
  padding: 0;
  background: none;
  color: inherit;
}

.article-body .callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.25rem 1.25rem 1.25rem 3.5rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--blog-radius-small);
  background: var(--blog-tint);
}

.article-body .callout::before {
  content: "i";
  position: absolute;
  top: 1.25rem;
  left: 1rem;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid currentColor;
  border-radius: var(--blog-pill);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  line-height: 1.5rem;
  text-align: center;
}

.article-body .callout--warning,
.article-body .callout.warning {
  border-left-color: var(--warn);
  background: var(--blog-warning-tint);
}

.article-body .callout--warning::before,
.article-body .callout.warning::before {
  content: "!";
}

.article-body .callout--success,
.article-body .callout.success {
  border-left-color: var(--success);
  background: var(--blog-success-tint);
}

.article-body .callout > :first-child {
  margin-top: 0;
}

.article-body .callout > :last-child {
  margin-bottom: 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 1rem;
  margin-block: 1.5rem;
}

.stat-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--text-muted);
  border-radius: var(--blog-radius-small);
  background: var(--panel);
  box-shadow: var(--blog-inset);
}

.stat-card:nth-child(even) {
  background: var(--panel-2);
  border-top-color: var(--text);
}

.stat-num {
  display: block;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--blog-brand-size);
  font-weight: var(--blog-weight-strong);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
}

.article-body.prose .check-list {
  padding: 0;
  list-style: none;
}

.article-body.prose .check-list li {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius-small);
  background: var(--panel);
}

.verdict {
  margin-block: 1.5rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
  border-radius: var(--blog-radius-small);
  background: var(--blog-tint);
  color: var(--text);
}

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

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

.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: 2rem;
  border: 1px solid var(--text-muted);
  border-radius: var(--blog-radius);
  background: var(--panel-2);
  color: var(--text);
  box-shadow: var(--blog-inset), var(--blog-shadow);
}

.promo-block::before {
  content: "";
  position: absolute;
  inset: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius-small);
  pointer-events: none;
}

.promo-block__copy {
  flex: 1 1 18rem;
  min-width: 0;
}

.promo-block__brand {
  font-family: var(--font-display);
  font-size: var(--blog-brand-size);
  font-weight: var(--blog-weight-strong);
}

.promo-block__copy p {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
  font-size: var(--blog-body);
  line-height: 1.8;
}

.promo-block .btn--primary {
  position: relative;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--panel);
}

.promo-block .btn--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding-block: 0.75rem 1rem;
  margin-block: 0;
}

.post-nav__card {
  display: block;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--blog-radius-small);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--blog-transition), box-shadow var(--blog-transition);
}

.post-nav__card:hover,
.post-nav__card:focus-visible {
  border-color: var(--accent);
  box-shadow: var(--blog-shadow);
}

.post-nav__next {
  grid-column: 2;
}

.post-nav__label,
.post-nav__date {
  display: block;
  color: var(--text-muted);
  font-size: var(--blog-small);
  line-height: 1.7;
}

.post-nav__title {
  display: block;
  margin-block: 0.5rem;
  font-size: var(--blog-body);
  font-weight: var(--blog-weight-strong);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

#related-posts {
  padding-block: 1rem 2rem;
  margin-block: 0;
}

#related-posts .related-heading {
  margin: 0 0 1.25rem;
  font-size: var(--blog-heading);
  font-weight: var(--blog-weight-strong);
  line-height: 1.6;
}

#related-posts .article-card {
  padding: 1.25rem;
}

#related-posts .article-card__title {
  font-size: var(--blog-lead);
}

#related-posts .article-card__summary {
  font-size: var(--blog-small);
}

#post-nav[hidden],
#related-posts[hidden] {
  display: none;
}

.float-cta {
  position: fixed;
  right: max(var(--gutter), env(safe-area-inset-right));
  bottom: calc(1.25rem + env(safe-area-inset-bottom));
  z-index: 40;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  max-width: calc(100vw - var(--gutter) - var(--gutter));
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--blog-pill);
  background: var(--accent);
  color: var(--panel);
  box-shadow: var(--blog-shadow);
  font-family: var(--font-body);
  font-size: var(--blog-body);
  font-weight: var(--blog-weight-strong);
  line-height: 1.5;
  text-decoration: none;
}

.float-cta svg {
  flex: 0 0 auto;
  width: 1.125rem;
  height: 1.125rem;
  fill: none;
  stroke: currentColor;
}

.float-cta:hover {
  background: var(--accent-dark);
}

.blog-page a:focus-visible,
.blog-page button:focus-visible,
.reading-wrap a:focus-visible,
.table-scroll:focus-visible,
.float-cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

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

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

  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .article-body.prose table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

  .article-body.prose .table-scroll table {
    display: table;
    width: 100%;
    max-width: none;
  }
}

@media (max-width: 640px) {
  .no-break {
    white-space: normal;
  }

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

  .blog-hero {
    padding: 2rem 1.5rem;
  }

  .blog-hero::before {
    right: 1rem;
  }

  .blog-hero__lead {
    margin-left: 0;
  }

  .blog-post-grid {
    grid-template-columns: 1fr;
  }

  .article-card {
    padding: 1.25rem;
  }

  .article-hero {
    padding-block: 1.75rem;
  }

  .article-hero::before {
    right: var(--gutter);
  }

  .article-hero .article-meta,
  .article-hero .article-hero__meta,
  .article-hero .article-summary,
  .article-hero .article-hero__summary,
  .article-hero > p {
    margin-left: 0;
  }

  .article-body.prose h2 {
    margin-top: 1.75rem;
  }

  .promo-block {
    padding: 1.5rem;
  }

  #post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav__next {
    grid-column: auto;
  }

  .float-cta {
    position: static;
    display: flex;
    width: fit-content;
    max-width: calc(100% - var(--gutter) - var(--gutter));
    margin: 1rem auto calc(1.5rem + env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card,
  .post-nav__card,
  .float-cta,
  .blog-filters button {
    animation: none;
    transition: none;
  }

  .blog-page,
  .reading-wrap {
    scroll-behavior: auto;
  }
}