:root {
  --blog-column: 56rem;
  --blog-inset: 2rem;
  --blog-card-gap: 1.25rem;
  --blog-title-list: 3rem;
  --blog-title-article: 2.6rem;
  --blog-title-section: 1.6rem;
  --blog-title-subsection: 1.3rem;
  --blog-body-size: 1rem;
  --blog-leading: 1.85;
  --blog-tracking: -0.015em;
  --blog-rule-width: 0.25rem;
  --blog-table-min: 38rem;
  --blog-focus: 0.1875rem;
  --blog-card-shadow: 0 0.6rem 2.5rem color-mix(in srgb, var(--accent) 10%, var(--clear));
  --blog-inset-shadow: inset 0 1px 0 var(--hl);
  --blog-promo-bg: linear-gradient(120deg, var(--text), var(--accent-dark));
  --blog-tint: color-mix(in srgb, var(--panel-2) 42%, var(--panel));
  --blog-rose-tint: color-mix(in srgb, var(--accent) 7%, var(--panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 9%, var(--panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 12%, var(--panel));
}

.blog-list-wrap {
  padding-bottom: 3rem;
}

.blog-index h1,
.blog-index h2,
.blog-index h3,
.article-hero h1,
.prose h1,
.prose h2,
.prose h3,
.article-body h1,
.article-body h2,
.article-body h3,
#related-posts h2,
#related-posts h3,
.promo-block h2 {
  display: block;
  text-wrap: pretty;
  letter-spacing: var(--blog-tracking);
  overflow-wrap: break-word;
  font-family: var(--font-display);
}

.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li {
  min-width: 0;
  overflow-wrap: anywhere;
}

.breadcrumbs li + li::before {
  content: "›";
  display: inline-block;
  margin-right: 0.6rem;
  color: var(--accent-dark);
}

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

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

.blog-list-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 3.5rem var(--blog-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-dark);
  background: linear-gradient(180deg, var(--hero-top), var(--hero-bottom));
  box-shadow: var(--blog-inset-shadow), var(--blog-card-shadow);
  text-align: center;
}

.blog-list-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 1.5rem;
  bottom: 1.5rem;
  left: 0.75rem;
  width: var(--blog-rule-width);
  border-radius: var(--r-pill);
  background: var(--grad-accent);
}

.blog-kicker {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--accent-dark);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}

.blog-list-hero h1 {
  margin: 1.2rem 0;
  font-size: clamp(2rem, 5vw, var(--blog-title-list));
  line-height: 1.24;
  color: var(--text);
}

.blog-gradient {
  color: var(--accent-dark);
  background: var(--grad-accent);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: var(--clear);
}

.blog-list-hero > p {
  max-width: 37rem;
  margin: 0 auto;
  color: var(--muted);
  font-size: var(--text-base);
  line-height: var(--blog-leading);
}

.blog-route-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.5rem;
  color: var(--accent-dark);
  font-size: var(--text-sm);
}

.blog-route-strip span:not([aria-hidden]) {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
}

.blog-library {
  margin-block: 2.5rem;
}

.blog-library-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.blog-library-head h2 {
  margin: 0;
  font-size: var(--blog-title-section);
}

.blog-results-status {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-sm);
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.2rem 0 1.5rem;
}

.blog-filters button {
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.blog-filters button:hover {
  border-color: var(--accent);
  background: var(--blog-rose-tint);
}

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

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100%;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-card);
  background: var(--panel);
  box-shadow: var(--blog-inset-shadow), var(--blog-card-shadow);
  color: var(--text);
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.article-card:hover,
.article-card:focus-within {
  border-color: var(--accent);
  transform: translateY(-3px);
}

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

.article-meta time {
  font-family: var(--font-mono);
}

.article-card h3 {
  margin: 1rem 0 0.75rem;
  font-size: var(--blog-title-subsection);
  line-height: 1.6;
}

.article-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.article-card h3 a:hover {
  color: var(--accent-dark);
}

.article-card-summary {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.article-read-link {
  align-self: flex-start;
  margin-top: auto;
  padding-block: 0.35rem;
  color: var(--accent-dark);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-card);
  background: var(--panel);
  color: var(--muted);
  line-height: var(--blog-leading);
}

/* 文章外盒保留 gutter，正文内缘与标题卡的内容内缘一致。 */
.reading-wrap {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-column) + var(--gutter) + var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-width: 0;
}

.article-hero {
  position: relative;
  box-sizing: border-box;
  width: calc(100% - var(--gutter) - var(--gutter));
  max-width: var(--blog-column);
  margin: 0 auto 1.75rem;
  padding-block: 2rem;
  padding-inline: var(--blog-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--blog-tint);
  box-shadow: var(--blog-inset-shadow), var(--blog-card-shadow);
}

.reading-wrap .article-hero {
  width: 100%;
}

.article-hero::before {
  content: "";
  position: absolute;
  top: 1.25rem;
  bottom: 1.25rem;
  left: 0.65rem;
  width: var(--blog-rule-width);
  border-radius: var(--r-pill);
  background: var(--grad-accent);
}

.article-hero .article-meta {
  margin-bottom: 1rem;
}

.article-hero .article-meta > * {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--muted);
}

.article-hero .article-meta .badge {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: var(--on-ink);
}

.article-hero h1 {
  margin: 0 0 1rem;
  color: var(--text);
  font-size: clamp(1.8rem, 3.8vw, var(--blog-title-article));
  font-weight: var(--weight-display);
  line-height: 1.4;
}

.article-hero > p,
.article-hero .article-summary {
  margin: 0;
  color: var(--muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.prose.reading-wrap,
.article-body.reading-wrap {
  width: 100%;
  max-width: calc(var(--blog-column) + var(--gutter) + var(--gutter));
  margin-inline: auto;
  padding-inline: calc(var(--gutter) + var(--blog-inset));
}

.reading-wrap > .prose,
.reading-wrap > .article-body {
  box-sizing: border-box;
  max-width: none;
  margin-inline: auto;
  padding-inline: var(--blog-inset);
}

.reading-wrap > .breadcrumbs {
  padding-inline: var(--blog-inset);
}

.prose,
.article-body {
  min-width: 0;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
  overflow-wrap: break-word;
}

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

.prose p,
.article-body p {
  margin-block: 1rem;
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.prose h2,
.article-body h2 {
  position: relative;
  margin: 2.4rem 0 1rem;
  padding-top: 0.85rem;
  color: var(--text);
  font-size: var(--blog-title-section);
  font-weight: var(--weight-bold);
  line-height: 1.55;
}

.prose h2::before,
.article-body h2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2.5rem;
  height: 0.2rem;
  border-radius: var(--r-pill);
  background: var(--grad-accent);
}

.prose h3,
.article-body h3 {
  margin: 1.6rem 0 0.7rem;
  font-size: var(--blog-title-subsection);
  line-height: 1.6;
}

.prose a,
.article-body a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  overflow-wrap: anywhere;
}

.prose ul,
.prose ol,
.article-body ul,
.article-body ol {
  margin-block: 1rem;
  padding-inline-start: 1.5rem;
}

.prose li + li,
.article-body li + li {
  margin-top: 0.55rem;
}

.prose blockquote,
.article-body blockquote {
  margin: 1.5rem 0;
  padding: 0.8rem 1.25rem;
  border-inline-start: var(--blog-rule-width) solid var(--accent);
  border-radius: var(--r-small);
  background: var(--blog-rose-tint);
  color: var(--ink-2);
}

.prose :not(pre) > code,
.article-body :not(pre) > code {
  padding: 0.15em 0.35em;
  border: 1px solid var(--border);
  border-radius: var(--r-small);
  background: var(--panel-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9em;
  white-space: normal;
  overflow-wrap: anywhere;
}

.prose pre,
.article-body pre {
  position: relative;
  max-width: 100%;
  margin-block: 1.5rem;
  padding: 2.75rem 1.25rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--ink-2);
  border-radius: var(--r-mini);
  background: var(--text);
  color: var(--on-ink);
  box-shadow: var(--blog-inset-shadow);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.prose pre::before,
.article-body pre::before {
  content: "CODE";
  position: absolute;
  top: 0.7rem;
  left: 1.25rem;
  color: var(--honey);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}

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

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

.prose table,
.article-body table {
  width: 100%;
  margin-block: 1.5rem;
  border-collapse: collapse;
  color: var(--text);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.prose .table-scroll table,
.article-body .table-scroll table {
  min-width: var(--blog-table-min);
  margin: 0;
}

.prose th,
.prose td,
.article-body th,
.article-body td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: start;
  vertical-align: top;
}

.prose thead th,
.article-body thead th {
  background: var(--text);
  color: var(--on-ink);
  font-weight: var(--weight-semibold);
}

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

.prose tbody tr:nth-child(even),
.article-body tbody tr:nth-child(even) {
  background: var(--blog-tint);
}

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

.callout {
  position: relative;
  margin-block: 1.5rem;
  padding: 1rem 1.25rem 1rem 3.5rem;
  border: 1px solid var(--border);
  border-inline-start: var(--blog-rule-width) solid var(--accent);
  border-radius: var(--r-mini);
  background: var(--blog-rose-tint);
  color: var(--text);
  line-height: var(--blog-leading);
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.1rem;
  left: 1rem;
  display: inline-block;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: var(--r-round);
  background: var(--accent-dark);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  line-height: 1.45rem;
  text-align: center;
}

.callout.warning,
.callout.callout-warning,
.callout--warning {
  border-inline-start-color: var(--warn);
  background: var(--blog-warning-tint);
}

.callout.warning::before,
.callout.callout-warning::before,
.callout--warning::before {
  content: "!";
  background: var(--warn);
  color: var(--text);
}

.callout.success,
.callout.callout-success,
.callout--success {
  border-inline-start-color: var(--success);
  background: var(--blog-success-tint);
}

.callout.success::before,
.callout.callout-success::before,
.callout--success::before {
  content: "i";
  background: var(--mint-ink);
  color: var(--on-ink);
}

.callout p:first-child {
  margin-top: 0;
}

.callout p: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 {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--r-mini);
  background: var(--blog-rose-tint);
}

.stat-card:nth-child(even) {
  border-top-color: var(--sky-ink);
  background: color-mix(in srgb, var(--sky-soft) 45%, var(--panel));
}

.stat-num {
  display: block;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: var(--weight-bold);
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.stat-card:nth-child(even) .stat-num {
  color: var(--sky-ink);
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.prose .check-list,
.article-body .check-list,
.check-list {
  margin-block: 1.5rem;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-small);
  background: var(--panel);
  color: var(--text);
  line-height: var(--blog-leading);
}

.check-list li + li {
  margin-top: 0.65rem;
}

.verdict {
  margin-block: 1.5rem;
  padding: 1rem 1.25rem;
  border-inline-start: var(--blog-rule-width) solid var(--accent-dark);
  border-radius: var(--r-small);
  background: var(--blog-rose-tint);
  color: var(--text);
  line-height: var(--blog-leading);
}

.verdict > strong:first-child,
.verdict p:first-child > strong:first-child {
  color: var(--accent-dark);
  font-weight: var(--weight-bold);
}

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

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

.promo-block {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: 2rem var(--blog-inset);
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-card);
  background: var(--blog-promo-bg);
  color: var(--on-ink);
  box-shadow: var(--blog-card-shadow);
}

.promo-block h2 {
  margin: 0 0 0.75rem;
  color: var(--on-ink);
  font-size: var(--blog-title-section);
  line-height: 1.5;
}

.promo-block p {
  margin: 0;
  color: var(--on-ink);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.promo-block .promo-trust {
  margin-top: 0.75rem;
  font-size: var(--text-sm);
}

.promo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.promo-block .btn {
  border: 1px solid var(--panel);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
}

.promo-block .btn:hover {
  background: var(--panel-2);
  color: var(--text);
}

.promo-block .btn-secondary {
  border-color: var(--on-ink);
  background: var(--clear);
  color: var(--on-ink);
}

.promo-block .btn-secondary:hover {
  background: var(--panel);
  color: var(--text);
}

#related-posts {
  padding-top: 1.5rem;
  padding-bottom: 1rem;
}

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

#related-posts > h2 {
  margin: 0 0 1.25rem;
  color: var(--text);
  font-size: var(--blog-title-section);
  line-height: 1.5;
}

.related-card {
  padding: 1.25rem;
}

.related-card h3 {
  font-size: 1.1rem;
}

.related-card .article-card-summary {
  font-size: var(--text-sm);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--blog-card-gap);
  padding-top: 1rem;
  padding-bottom: 1.5rem;
}

.post-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-mini);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.post-nav-card:hover,
.post-nav-card:focus-visible {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.post-nav-card strong {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: 1.75;
  overflow-wrap: break-word;
}

.post-nav-label {
  color: var(--accent-dark);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}

.post-nav-meta {
  margin-top: auto;
  color: var(--muted);
  font-size: var(--text-xs);
  line-height: 1.7;
}

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

.blog-filters button:focus-visible,
.article-card a:focus-visible,
.post-nav-card:focus-visible,
.breadcrumbs a:focus-visible,
.promo-block a:focus-visible,
.prose a:focus-visible,
.article-body a:focus-visible,
.table-scroll:focus-visible {
  outline: var(--blog-focus) solid var(--accent-dark);
  outline-offset: 0.2rem;
}

.promo-block a:focus-visible {
  outline-color: var(--on-ink);
}

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

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

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

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

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

@media (max-width: 640px) {
  :root {
    --blog-inset: 1.5rem;
  }

  .no-break {
    white-space: normal;
  }

  .blog-list-hero {
    padding-block: 2.25rem;
  }

  .blog-list-hero h1 {
    font-size: clamp(1.9rem, 8vw, 2.5rem);
  }

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

  .article-card {
    padding: 1.25rem;
  }

  .article-hero {
    padding-block: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .article-hero h1 {
    font-size: clamp(1.65rem, 6.6vw, 2.25rem);
  }

  .article-hero .article-meta > * {
    padding: 0.3rem 0.55rem;
  }

  .prose h2,
  .article-body h2 {
    margin-top: 2rem;
  }

  .promo-block {
    padding-block: 1.5rem;
  }

  .promo-actions {
    align-items: stretch;
  }

  .post-nav-next {
    grid-column: auto;
  }

  .breadcrumbs {
    margin-top: 1.5rem;
  }

  .callout {
    padding-right: 1rem;
  }
}

@media (min-width: 641px) {
  .no-break {
    white-space: nowrap;
  }
}

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

  .article-card:hover,
  .article-card:focus-within,
  .post-nav-card:hover,
  .post-nav-card:focus-visible {
    transform: none;
  }
}