:root {
  --blog-column: 56rem;
  --blog-gutter: 1.5rem;
  --blog-list-title: clamp(2rem, 5vw, 3rem);
  --blog-article-title: clamp(1.8rem, 4.5vw, 2.6rem);
  --blog-h2: clamp(1.3rem, 3vw, 1.6rem);
  --blog-h3: 1.3rem;
  --blog-body-size: 1rem;
  --blog-leading: 1.85;
  --blog-tracking: 0;
  --blog-focus-width: 3px;
  --blog-lift: -3px;
  --blog-paper-tint: color-mix(in srgb, var(--apricot) 22%, var(--panel));
  --blog-blue-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) 11%, var(--panel));
  --blog-promo-bg: linear-gradient(120deg, var(--accent-dark), var(--accent));
  --blog-window-dots: linear-gradient(to right, var(--error) 0 24%, var(--transparent) 24% 38%, var(--warn) 38% 62%, var(--transparent) 62% 76%, var(--success) 76% 100%);
}

.blog-list-page main,
.article-page main {
  min-width: 0;
}

.blog-list-hero {
  padding-block: clamp(2.5rem, 7vw, 5rem) 2rem;
  text-align: center;
}

.blog-list-hero h1 {
  margin: 0.75rem 0 1rem;
  font-family: var(--font-display);
  font-size: var(--blog-list-title);
  font-weight: var(--weight-body);
  line-height: 1.25;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  color: var(--text);
}

.blog-list-hero .eyebrow {
  color: var(--accent);
}

.blog-intro {
  max-width: 40rem;
  margin-inline: auto;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.blog-topic-notes,
.blog-filter,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.blog-topic-notes {
  justify-content: center;
  margin-top: 1.5rem;
}

.blog-catalog {
  padding-bottom: 2rem;
}

.blog-filter {
  justify-content: center;
  padding-block: 1rem;
  border-block: 1px solid var(--border);
}

.blog-filter-button {
  min-height: 44px;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}

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

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

.blog-filter-button:focus-visible,
.article-card a:focus-visible,
#post-nav a:focus-visible,
.breadcrumb a:focus-visible,
.breadcrumbs a:focus-visible,
.float-cta:focus-visible {
  outline: var(--blog-focus-width) solid var(--accent);
  outline-offset: 4px;
}

.blog-status {
  margin-block: 1.1rem;
  color: var(--text-muted);
  font-size: var(--small-size);
  line-height: 1.6;
}

.blog-card-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 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(--r-card);
  background: var(--panel);
  box-shadow: inset 0 1px 0 var(--hl), var(--paper-shadow);
  transition: transform var(--fast) var(--ease), border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

.article-card:hover,
.article-card:focus-within {
  transform: translateY(var(--blog-lift));
  border-color: var(--accent);
  box-shadow: inset 0 3px 0 var(--accent), var(--card-shadow);
}

.article-meta {
  justify-content: flex-start;
  font-size: var(--small-size);
  color: var(--text-muted);
  line-height: 1.6;
}

.article-date,
.article-readtime,
.article-meta > time,
.article-meta > .read-time,
.article-meta > .reading-time {
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  font-variant-numeric: tabular-nums;
}

.article-category,
.article-meta > .badge {
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--accent);
  border-radius: var(--r-pill);
  color: var(--panel);
  background: var(--accent);
  overflow-wrap: anywhere;
}

.article-card-title {
  margin-block: 1rem 0.75rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h3);
  font-weight: var(--weight-medium);
  line-height: 1.55;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.article-card-title a {
  color: inherit;
  text-decoration: none;
}

.article-card-title a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

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

.article-read-link {
  align-self: flex-start;
  margin-top: auto;
  padding-block: 0.5rem;
  color: var(--accent);
  font-weight: var(--weight-medium);
  text-underline-offset: 0.25em;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-card);
  color: var(--text-muted);
  background: var(--panel);
  line-height: var(--blog-leading);
}

/* 所有阅读区域共用相同外宽、留白和居中方式。 */
.reading-wrap,
.article-hero,
.breadcrumb,
.breadcrumbs,
.article-body,
#related-posts,
#post-nav,
.article-page .promo-block {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-column) + var(--blog-gutter) + var(--blog-gutter));
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
  min-width: 0;
}

.breadcrumb,
.breadcrumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: var(--small-size);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

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

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

.article-hero {
  margin-block: 0 1.75rem;
  padding-block: 1.5rem;
}

.article-window {
  position: relative;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  background: var(--panel);
  box-shadow: inset 0 1px 0 var(--hl), var(--paper-shadow);
  overflow: hidden;
}

.article-hero.article-window {
  padding-inline: var(--blog-gutter);
}

.article-hero .article-window {
  margin-inline: calc(-1 * var(--blog-gutter));
  padding-inline: var(--blog-gutter);
}

.window-bar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.75rem;
  margin: -1.5rem -1.5rem 1.5rem;
  padding: 0.6rem 1.5rem 0.6rem 5.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--small-size);
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.window-bar::before {
  content: "";
  position: absolute;
  inset-inline-start: 1.5rem;
  top: 1.05rem;
  width: 2.6rem;
  height: 0.55rem;
  border-radius: var(--r-xs);
  background: var(--blog-window-dots);
}

.window-body {
  min-width: 0;
  padding-block: 0.25rem 0.5rem;
}

.article-hero .window-body {
  padding-inline: 0;
}

.article-hero h1,
.article-window h1 {
  margin-block: 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-article-title);
  font-weight: var(--weight-body);
  line-height: 1.4;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.article-hero .article-summary,
.article-hero .lede,
.window-body > p {
  margin-block: 0.75rem 0;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.article-body.prose {
  padding-block: 0 1.5rem;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  line-height: var(--blog-leading);
}

.article-body.prose :is(h1, h2, h3),
.reading-wrap.prose :is(h1, h2, h3) {
  display: block;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
}

.article-body.prose h2,
.reading-wrap.prose h2 {
  margin-block: 2rem 1rem;
  color: var(--accent-dark);
  font-family: var(--font-display);
  font-size: var(--blog-h2);
  font-weight: var(--weight-medium);
  line-height: 1.5;
  scroll-margin-top: var(--anchor-space);
}

.article-body.prose h2::before,
.reading-wrap.prose h2::before {
  content: "";
  display: inline-block;
  width: 1.25rem;
  height: 0.2rem;
  margin-inline-end: 0.65rem;
  border-radius: var(--r-pill);
  background: var(--accent);
  vertical-align: middle;
}

.article-body.prose > h2:first-child,
.article-body.prose > section:first-child > h2:first-child {
  margin-top: 0.5rem;
}

.article-body.prose h3,
.reading-wrap.prose h3 {
  margin-block: 1.5rem 0.65rem;
  color: var(--text);
  font-size: var(--blog-h3);
  font-weight: var(--weight-medium);
  line-height: 1.55;
}

.article-body.prose p {
  margin-block: 0.85rem;
}

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

.article-body.prose li + li {
  margin-top: 0.45rem;
}

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

.article-body.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-inline-start: 3px solid var(--accent);
  border-radius: var(--r-sm);
  background: var(--blog-paper-tint);
  color: var(--text-muted);
}

.article-body.prose code {
  padding: 0.15em 0.35em;
  border-radius: var(--r-xs);
  background: var(--panel-2);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--small-size);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-body.prose pre {
  position: relative;
  max-width: 100%;
  margin-block: 1.5rem;
  padding: 2.8rem 1.25rem 1.25rem;
  border: 1px solid var(--accent);
  border-radius: var(--r-ui);
  overflow-x: auto;
  background: var(--accent-dark);
  color: var(--panel);
  line-height: 1.8;
}

.article-body.prose pre::before {
  content: "";
  position: absolute;
  inset-inline-start: 1.25rem;
  top: 1rem;
  width: 2.6rem;
  height: 0.5rem;
  border-radius: var(--r-xs);
  background: var(--blog-window-dots);
}

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

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

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--blog-body-size);
  line-height: 1.7;
}

.article-body caption {
  padding: 0.75rem;
  color: var(--text-muted);
  text-align: start;
}

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

.article-body thead th {
  background: var(--accent);
  color: var(--panel);
  font-weight: var(--weight-medium);
}

.article-body tbody th {
  color: var(--text);
}

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

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

.article-body .callout {
  position: relative;
  margin-block: 1.5rem;
  padding: 1rem 1.25rem 1rem 3.25rem;
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--r-ui);
  color: var(--text);
  background: var(--blog-blue-tint);
}

.article-body .callout::before {
  content: "i";
  position: absolute;
  top: 1.15rem;
  inset-inline-start: 1rem;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid var(--accent);
  border-radius: var(--r-round);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: var(--small-size);
  line-height: 1.35rem;
  text-align: center;
}

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

.article-body :is(.callout-warning, .callout.warning, .callout.is-warning)::before {
  content: "!";
  border-color: var(--warn);
  color: var(--text);
}

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

.article-body :is(.callout-success, .callout.success, .callout.is-success)::before {
  border-color: var(--success);
  color: var(--success);
}

.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-ui);
  background: var(--blog-blue-tint);
}

.stat-card:nth-child(even) {
  border-top-color: var(--warn);
  background: var(--blog-paper-tint);
}

.stat-num {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-h2);
  font-weight: var(--weight-medium);
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.stat-label {
  display: block;
  color: var(--text-muted);
  font-size: var(--small-size);
  line-height: 1.8;
}

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

.check-list li {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
}

.article-body .verdict {
  margin-block: 1.5rem;
  padding: 1rem 1.25rem;
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--r-sm);
  background: var(--blog-paper-tint);
  color: var(--text);
}

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

.promo-block {
  box-sizing: border-box;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--accent);
  border-radius: var(--r-card);
  background: var(--blog-promo-bg);
  color: var(--panel);
  box-shadow: var(--paper-shadow);
}

.promo-block .promo-copy {
  flex: 1 1 20rem;
  min-width: 0;
}

.promo-block h2 {
  margin-block: 0 0.6rem;
  color: var(--panel);
  font-family: var(--font-display);
  font-size: var(--blog-h2);
  font-weight: var(--weight-body);
  text-wrap: pretty;
}

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

.promo-block :is(.btn-solid, .btn-primary) {
  border-color: var(--panel);
  background: var(--panel);
  color: var(--accent-dark);
}

.promo-block :is(.btn-ghost, .btn-secondary) {
  border-color: var(--panel);
  background: var(--transparent);
  color: var(--panel);
}

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

.blog-list-promo {
  margin-bottom: 3rem;
}

#related-posts {
  padding-block: 1.5rem;
}

.related-heading {
  margin-block: 0 1rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-h2);
  font-weight: var(--weight-body);
  text-wrap: pretty;
}

.related-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.related-card {
  padding: 1.25rem;
}

.related-card .article-card-title {
  font-size: var(--blog-body-size);
}

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

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

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

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

.post-nav-card:hover {
  transform: translateY(var(--blog-lift));
  border-color: var(--accent);
}

.post-nav-label {
  color: var(--accent);
  font-size: var(--small-size);
  font-weight: var(--weight-medium);
}

.post-nav-title {
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.post-nav-category {
  color: var(--text-muted);
  font-size: var(--small-size);
}

.float-cta {
  position: fixed;
  inset-inline-end: max(1.25rem, env(safe-area-inset-right));
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 48px;
  max-width: calc(100vw - 2.5rem);
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--accent);
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--panel);
  box-shadow: var(--paper-shadow);
  font-family: var(--font-body);
  font-size: var(--blog-body-size);
  font-weight: var(--weight-medium);
  line-height: 1.5;
  text-decoration: none;
  transition: background var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.float-cta svg {
  flex: 0 0 auto;
  width: 1.25rem;
  height: 1.25rem;
  stroke: currentColor;
}

.float-cta:hover {
  transform: translateY(var(--blog-lift));
  background: var(--accent-dark);
}

body:has(.float-cta) {
  padding-bottom: calc(5.5rem + env(safe-area-inset-bottom));
}

body:has(.float-cta) .help-bubble {
  bottom: calc(5.5rem + env(safe-area-inset-bottom));
}

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

  .article-body .table-scroll table {
    display: table;
    width: 100%;
    min-width: 36rem;
    max-width: none;
  }

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

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

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

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

  .blog-filter {
    gap: 0.5rem;
    justify-content: flex-start;
  }

  .blog-filter-button {
    padding-inline: 0.85rem;
  }

  .article-card {
    padding: 1.25rem;
  }

  .article-hero h1,
  .article-window h1 {
    overflow-wrap: anywhere;
  }

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

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

  .promo-block .cta-row {
    width: 100%;
    flex-wrap: wrap;
  }

  .float-cta {
    inset-inline-end: 1rem;
    bottom: calc(1rem + env(safe-area-inset-bottom));
    max-width: calc(100vw - 2rem);
    padding-inline: 1rem;
  }
}

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

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